Merge "[dev.ssa] Merge remote-tracking branch 'origin/master' into ssamerge" into dev.ssa

.github/ISSUE_TEMPLATE

@@ -0,0 +1,18 @@
+Please answer these questions before submitting your issue. Thanks!
+
+1. What version of Go are you using (`go version`)?
+
+
+2. What operating system and processor architecture are you using (`go env`)?
+
+
+3. What did you do?
+(Use play.golang.org to provide a runnable example, if possible.)
+
+
+4. What did you expect to see?
+
+
+5. What did you see instead?
+
+

.github/PULL_REQUEST_TEMPLATE

@@ -0,0 +1,7 @@
+Please do not send pull requests to the golang/* repositories.
+
+We do, however, take contributions gladly.
+
+See https://golang.org/doc/contribute.html
+
+Thanks!

.gitignore

@@ -28,6 +28,7 @@ src/cmd/**/y.output
 src/cmd/cgo/zdefaultcc.go
 src/cmd/go/zdefaultcc.go
 src/cmd/internal/obj/zbootstrap.go
+src/go/build/zcgo.go
 src/go/doc/headscan
 src/runtime/internal/sys/zversion.go
 src/unicode/maketables

doc/go1.7.txt

@@ -1,14 +1,20 @@
 Tools:
 
+cmd/dist: add list subcommand to list all supported platforms (CL 19837)
 cmd/go: GO15VENDOREXPERIMENT gone, assumed on (CL 19615)
 cmd/link: "-X name value" form gone (CL 19614)
+cmd/compile: smaller binaries (many CLs)
+cmd/go, go/build: add support for Fortran (CL 19670, CL 4114)
+cmd/dist: introduce list subcommand to list all supported platforms (CL 19837)
 
 Ports:
 
-SOMETHING WILL HAPPEN
+We now require OpenBSD 5.6+ (CL 18219, crypto/rand using getentropy)
+plan9/arm support? Start at least.
 
 API additions and behavior changes:
 
-SOMETHING WILL HAPPEN
-
-
+runtime: add CallerFrames and Frames (CL 19869)
+testing/quick: now generates nil values (CL 16470)
+net/url: support query string without values (CL 19931)
+net/textproto: permit all valid token chars in CanonicalMIMEHeaderKey input (CL 18725)

doc/install-source.html

@@ -445,6 +445,9 @@ The valid combinations of <code>$GOOS</code> and <code>$GOARCH</code> are:
 <th width="50"></th><th align="left" width="100"><code>$GOOS</code></th> <th align="left" width="100"><code>$GOARCH</code></th>
 </tr>
 <tr>
+<td></td><td><code>android</code></td> <td><code>arm</code></td>
+</tr>
+<tr>
 <td></td><td><code>darwin</code></td> <td><code>386</code></td>
 </tr>
 <tr>

misc/cgo/errors/ptr.go

@@ -122,6 +122,16 @@ var ptrTests = []ptrTest{
 		body:    `i := 0; p := &S{p:&i}; s := p.a[:]; C.f(unsafe.Pointer(&s[0]))`,
 		fail:    false,
 	},
+	{
+		// Passing the address of a slice of an array that is
+		// an element in a struct, with a type conversion.
+		name:    "slice-ok-4",
+		c:       `typedef void* PV; void f(PV p) {}`,
+		imports: []string{"unsafe"},
+		support: `type S struct { p *int; a [4]byte }`,
+		body:    `i := 0; p := &S{p:&i}; C.f(C.PV(unsafe.Pointer(&p.a[0])))`,
+		fail:    false,
+	},
 	{
 		// Passing the address of a static variable with no
 		// pointers doesn't matter.

misc/cgo/fortran/answer.f90

@@ -0,0 +1,9 @@
+! Copyright 2016 The Go Authors.  All rights reserved.
+! Use of this source code is governed by a BSD-style
+! license that can be found in the LICENSE file.
+
+function the_answer() result(j) bind(C)
+  use iso_c_binding, only: c_int
+  integer(c_int) :: j ! output
+  j = 42
+end function the_answer

misc/cgo/fortran/fortran.go

@@ -0,0 +1,12 @@
+// Copyright 2016 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fortran
+
+// int the_answer();
+import "C"
+
+func TheAnswer() int {
+	return int(C.the_answer())
+}

misc/cgo/fortran/fortran_test.go

@@ -0,0 +1,13 @@
+// Copyright 2016 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fortran
+
+import "testing"
+
+func TestFortran(t *testing.T) {
+	if a := TheAnswer(); a != 42 {
+		t.Errorf("Unexpected result for The Answer. Got: %d Want: 42", a)
+	}
+}

misc/cgo/fortran/helloworld/helloworld.f90

@@ -0,0 +1,3 @@
+      program HelloWorldF90
+              write(*,*) "Hello World!"
+      end program HelloWorldF90

misc/cgo/fortran/test.bash

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Copyright 2016 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# This directory is intended to test the use of Fortran with cgo.
+
+set -e
+
+FC=$1
+
+if ! $FC helloworld/helloworld.f90 -o main.exe >& /dev/null; then
+  echo "skipping Fortran test: could not build helloworld.f90 with $FC"
+  exit 0
+fi
+
+if ! go test; then
+  echo "FAIL: go test"
+  status=1
+fi
+
+exit $status

misc/cgo/testcshared/test.bash

@@ -10,7 +10,7 @@ set -e
 
 if [ ! -f src/libgo/libgo.go ]; then
 	cwd=$(pwd)
-	echo 'misc/cgo/testcshared/test.bash is running in $cwd' 1>&2
+	echo "misc/cgo/testcshared/test.bash is running in $cwd" 1>&2
 	exit 1
 fi
 

misc/git/pre-commit

@@ -10,7 +10,7 @@
 #
 # This script does not handle file names that contain spaces.
 
-gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
+gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '\.go$')
 [ -z "$gofiles" ] && exit 0
 
 unformatted=$(gofmt -l $gofiles)

src/bufio/bufio.go

@@ -705,7 +705,7 @@ func (b *Writer) ReadFrom(r io.Reader) (n int64, err error) {
 		}
 	}
 	if err == io.EOF {
-		// If we filled the buffer exactly, flush pre-emptively.
+		// If we filled the buffer exactly, flush preemptively.
 		if b.Available() == 0 {
 			err = b.flush()
 		} else {

src/bufio/scan_test.go

@@ -351,7 +351,7 @@ func TestSplitError(t *testing.T) {
 // Test that an EOF is overridden by a user-generated scan error.
 func TestErrAtEOF(t *testing.T) {
 	s := NewScanner(strings.NewReader("1 2 33"))
-	// This spitter will fail on last entry, after s.err==EOF.
+	// This splitter will fail on last entry, after s.err==EOF.
 	split := func(data []byte, atEOF bool) (advance int, token []byte, err error) {
 		advance, token, err = ScanWords(data, atEOF)
 		if len(token) > 1 {

src/buildall.bash

@@ -32,13 +32,13 @@ if [ "$pattern" = "" ]; then
     pattern=.
 fi
 
-# put linux, nacl first in the target list to get all the architectures up front.
-targets="$((ls runtime | sed -n 's/^rt0_\(.*\)_\(.*\)\.s/\1-\2/p'; echo linux-386-387 linux-arm-arm5) | sort | sed -e 's|linux-mips64x|linux-mips64 linux-mips64le|' | egrep -v android-arm | egrep "$pattern" | egrep 'linux|nacl')
-$(ls runtime | sed -n 's/^rt0_\(.*\)_\(.*\)\.s/\1-\2/p' | egrep -v 'android-arm|darwin-arm' | egrep "$pattern" | egrep -v 'linux|nacl')"
-
 ./make.bash || exit 1
 GOROOT="$(cd .. && pwd)"
 
+# put linux, nacl first in the target list to get all the architectures up front.
+targets="$((../bin/go tool dist list | sed -n 's/^\(.*\)\/\(.*\)/\1-\2/p'; echo linux-386-387 linux-arm-arm5) | sort | egrep -v android-arm | egrep "$pattern" | egrep 'linux|nacl')
+$(../bin/go tool dist list | sed -n 's/^\(.*\)\/\(.*\)/\1-\2/p' | egrep -v 'android-arm|darwin-arm' | egrep "$pattern" | egrep -v 'linux|nacl')"
+
 failed=false
 for target in $targets
 do

src/bytes/bytes_test.go

@@ -335,6 +335,41 @@ func TestIndexByteBig(t *testing.T) {
 	}
 }
 
+// test a small index across all page offsets
+func TestIndexByteSmall(t *testing.T) {
+	b := make([]byte, 5015) // bigger than a page
+	// Make sure we find the correct byte even when straddling a page.
+	for i := 0; i <= len(b)-15; i++ {
+		for j := 0; j < 15; j++ {
+			b[i+j] = byte(100 + j)
+		}
+		for j := 0; j < 15; j++ {
+			p := IndexByte(b[i:i+15], byte(100+j))
+			if p != j {
+				t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 100+j, p)
+			}
+		}
+		for j := 0; j < 15; j++ {
+			b[i+j] = 0
+		}
+	}
+	// Make sure matches outside the slice never trigger.
+	for i := 0; i <= len(b)-15; i++ {
+		for j := 0; j < 15; j++ {
+			b[i+j] = 1
+		}
+		for j := 0; j < 15; j++ {
+			p := IndexByte(b[i:i+15], byte(0))
+			if p != -1 {
+				t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 0, p)
+			}
+		}
+		for j := 0; j < 15; j++ {
+			b[i+j] = 0
+		}
+	}
+}
+
 func TestIndexRune(t *testing.T) {
 	for _, tt := range indexRuneTests {
 		a := []byte(tt.a)
@@ -348,10 +383,12 @@ func TestIndexRune(t *testing.T) {
 
 var bmbuf []byte
 
+func BenchmarkIndexByte10(b *testing.B)          { bmIndexByte(b, IndexByte, 10) }
 func BenchmarkIndexByte32(b *testing.B)          { bmIndexByte(b, IndexByte, 32) }
 func BenchmarkIndexByte4K(b *testing.B)          { bmIndexByte(b, IndexByte, 4<<10) }
 func BenchmarkIndexByte4M(b *testing.B)          { bmIndexByte(b, IndexByte, 4<<20) }
 func BenchmarkIndexByte64M(b *testing.B)         { bmIndexByte(b, IndexByte, 64<<20) }
+func BenchmarkIndexBytePortable10(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 10) }
 func BenchmarkIndexBytePortable32(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 32) }
 func BenchmarkIndexBytePortable4K(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 4<<10) }
 func BenchmarkIndexBytePortable4M(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 4<<20) }

src/cmd/asm/doc.go

@@ -20,7 +20,7 @@ The GOOS and GOARCH environment variables set the desired target.
 Flags:
 
 	-D value
-		predefined symbol with optional simple value -D=identifer=value;
+		predefined symbol with optional simple value -D=identifier=value;
 		can be set multiple times
 	-I value
 		include directory; can be set multiple times

src/cmd/asm/internal/asm/endtoend_test.go

@@ -179,7 +179,7 @@ Diff:
 		t.Errorf(format, args...)
 		ok = false
 	}
-	obj.Flushplist(ctxt)
+	obj.FlushplistNoFree(ctxt)
 
 	for p := top; p != nil; p = p.Link {
 		if p.As == obj.ATEXT {

src/cmd/asm/internal/asm/parse.go

@@ -297,7 +297,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 			p.errorf("illegal use of register list")
 		}
 		p.registerList(a)
-		p.expect(scanner.EOF)
+		p.expectOperandEnd()
 		return true
 	}
 
@@ -331,7 +331,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 			}
 		}
 		// fmt.Printf("REG %s\n", obj.Dconv(&emptyProg, 0, a))
-		p.expect(scanner.EOF)
+		p.expectOperandEnd()
 		return true
 	}
 
@@ -363,7 +363,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 			a.Type = obj.TYPE_FCONST
 			a.Val = p.floatExpr()
 			// fmt.Printf("FCONST %s\n", obj.Dconv(&emptyProg, 0, a))
-			p.expect(scanner.EOF)
+			p.expectOperandEnd()
 			return true
 		}
 		if p.have(scanner.String) {
@@ -378,7 +378,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 			a.Type = obj.TYPE_SCONST
 			a.Val = str
 			// fmt.Printf("SCONST %s\n", obj.Dconv(&emptyProg, 0, a))
-			p.expect(scanner.EOF)
+			p.expectOperandEnd()
 			return true
 		}
 		a.Offset = int64(p.expr())
@@ -392,7 +392,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 				a.Type = obj.TYPE_MEM
 			}
 			// fmt.Printf("CONST %d %s\n", a.Offset, obj.Dconv(&emptyProg, 0, a))
-			p.expect(scanner.EOF)
+			p.expectOperandEnd()
 			return true
 		}
 		// fmt.Printf("offset %d \n", a.Offset)
@@ -402,7 +402,7 @@ func (p *Parser) operand(a *obj.Addr) bool {
 	p.registerIndirect(a, prefix)
 	// fmt.Printf("DONE %s\n", p.arch.Dconv(&emptyProg, 0, a))
 
-	p.expect(scanner.EOF)
+	p.expectOperandEnd()
 	return true
 }
 
@@ -983,14 +983,19 @@ func (p *Parser) more() bool {
 
 // get verifies that the next item has the expected type and returns it.
 func (p *Parser) get(expected lex.ScanToken) lex.Token {
-	p.expect(expected)
+	p.expect(expected, expected.String())
 	return p.next()
 }
 
+// expectOperandEnd verifies that the parsing state is properly at the end of an operand.
+func (p *Parser) expectOperandEnd() {
+	p.expect(scanner.EOF, "end of operand")
+}
+
 // expect verifies that the next item has the expected type. It does not consume it.
-func (p *Parser) expect(expected lex.ScanToken) {
-	if p.peek() != expected {
-		p.errorf("expected %s, found %s", expected, p.next())
+func (p *Parser) expect(expectedToken lex.ScanToken, expectedMessage string) {
+	if p.peek() != expectedToken {
+		p.errorf("expected %s, found %s", expectedMessage, p.next())
 	}
 }
 

src/cmd/asm/internal/asm/pseudo_test.go

@@ -35,7 +35,7 @@ func TestErroneous(t *testing.T) {
 		{"TEXT", "%", "expect two or three operands for TEXT"},
 		{"TEXT", "1, 1", "TEXT symbol \"<erroneous symbol>\" must be a symbol(SB)"},
 		{"TEXT", "$\"foo\", 0, $1", "TEXT symbol \"<erroneous symbol>\" must be a symbol(SB)"},
-		{"TEXT", "$0É:0, 0, $1", "expected EOF, found É"},   // Issue #12467.
+		{"TEXT", "$0É:0, 0, $1", "expected end of operand, found É"}, // Issue #12467.
 		{"TEXT", "$:0:(SB, 0, $1", "expected '(', found 0"},          // Issue 12468.
 		{"FUNCDATA", "", "expect two operands for FUNCDATA"},
 		{"FUNCDATA", "(SB ", "expect two operands for FUNCDATA"},

src/cmd/asm/internal/asm/testdata/arm64.s

@@ -237,7 +237,7 @@ again:
 //
 //		LSTXR reg ',' addr ',' reg
 //	{
-//		outtcode($1, &$2, &$4, &$6);
+//		outcode($1, &$2, &$4, &$6);
 //	}
 	LDAXRW	(R0), R2
 	STLXRW	R1, (R0), R3

src/cmd/asm/internal/flags/flags.go

@@ -29,7 +29,7 @@ var (
 )
 
 func init() {
-	flag.Var(&D, "D", "predefined symbol with optional simple value -D=identifer=value; can be set multiple times")
+	flag.Var(&D, "D", "predefined symbol with optional simple value -D=identifier=value; can be set multiple times")
 	flag.Var(&I, "I", "include directory; can be set multiple times")
 }
 

src/cmd/asm/internal/lex/input.go

@@ -30,7 +30,7 @@ type Input struct {
 	peekText        string
 }
 
-// NewInput returns a
+// NewInput returns an Input from the given path.
 func NewInput(name string) *Input {
 	return &Input{
 		// include directories: look in source dir, then -I directories.

src/cmd/asm/internal/lex/lex.go

@@ -77,7 +77,7 @@ func NewLexer(name string, ctxt *obj.Link) TokenReader {
 	input := NewInput(name)
 	fd, err := os.Open(name)
 	if err != nil {
-		log.Fatalf("asm: %s\n", err)
+		log.Fatalf("%s\n", err)
 	}
 	input.Push(NewTokenizer(name, fd, fd))
 	return input

src/cmd/asm/main.go

@@ -26,7 +26,7 @@ func main() {
 
 	architecture := arch.Set(GOARCH)
 	if architecture == nil {
-		log.Fatalf("asm: unrecognized architecture %s", GOARCH)
+		log.Fatalf("unrecognized architecture %s", GOARCH)
 	}
 
 	flags.Parse()
@@ -66,7 +66,7 @@ func main() {
 		obj.Writeobjdirect(ctxt, output)
 	}
 	if !ok || diag {
-		log.Printf("asm: assembly of %s failed", flag.Arg(0))
+		log.Printf("assembly of %s failed", flag.Arg(0))
 		os.Remove(*flags.OutputFile)
 		os.Exit(1)
 	}

src/cmd/cgo/doc.go

@@ -31,9 +31,9 @@ See $GOROOT/misc/cgo/stdio and $GOROOT/misc/cgo/gmp for examples.  See
 "C? Go? Cgo!" for an introduction to using cgo:
 https://golang.org/doc/articles/c_go_cgo.html.
 
-CFLAGS, CPPFLAGS, CXXFLAGS and LDFLAGS may be defined with pseudo #cgo
-directives within these comments to tweak the behavior of the C or C++
-compiler.  Values defined in multiple directives are concatenated
+CFLAGS, CPPFLAGS, CXXFLAGS, FFLAGS and LDFLAGS may be defined with pseudo
+#cgo directives within these comments to tweak the behavior of the C, C++
+or Fortran compiler.  Values defined in multiple directives are concatenated
 together.  The directive can include a list of build constraints limiting its
 effect to systems satisfying one of the constraints
 (see https://golang.org/pkg/go/build/#hdr-Build_Constraints for details about the constraint syntax).
@@ -53,7 +53,7 @@ For example:
 	// #include <png.h>
 	import "C"
 
-When building, the CGO_CFLAGS, CGO_CPPFLAGS, CGO_CXXFLAGS and
+When building, the CGO_CFLAGS, CGO_CPPFLAGS, CGO_CXXFLAGS, CGO_FFLAGS and
 CGO_LDFLAGS environment variables are added to the flags derived from
 these directives.  Package-specific flags should be set using the
 directives, not the environment variables, so that builds work in
@@ -62,10 +62,11 @@ unmodified environments.
 All the cgo CPPFLAGS and CFLAGS directives in a package are concatenated and
 used to compile C files in that package.  All the CPPFLAGS and CXXFLAGS
 directives in a package are concatenated and used to compile C++ files in that
-package.  All the LDFLAGS directives in any package in the program are
-concatenated and used at link time.  All the pkg-config directives are
-concatenated and sent to pkg-config simultaneously to add to each appropriate
-set of command-line flags.
+package.  All the CPPFLAGS and FFLAGS directives in a package are concatenated
+and used to compile Fortran files in that package.  All the LDFLAGS directives
+in any package in the program are concatenated and used at link time.  All the
+pkg-config directives are concatenated and sent to pkg-config simultaneously
+to add to each appropriate set of command-line flags.
 
 When the cgo directives are parsed, any occurrence of the string ${SRCDIR}
 will be replaced by the absolute path to the directory containing the source
@@ -83,7 +84,8 @@ When the Go tool sees that one or more Go files use the special import
 "C", it will look for other non-Go files in the directory and compile
 them as part of the Go package.  Any .c, .s, or .S files will be
 compiled with the C compiler.  Any .cc, .cpp, or .cxx files will be
-compiled with the C++ compiler.  Any .h, .hh, .hpp, or .hxx files will
+compiled with the C++ compiler.  Any .f, .F, .for or .f90 files will be
+compiled with the fortran compiler. Any .h, .hh, .hpp, or .hxx files will
 not be compiled separately, but, if these header files are changed,
 the C and C++ files will be recompiled.  The default C and C++
 compilers may be changed by the CC and CXX environment variables,

src/cmd/cgo/gcc.go

@@ -819,14 +819,17 @@ func (p *Package) hasSideEffects(f *File, x ast.Expr) bool {
 func (p *Package) isType(t ast.Expr) bool {
 	switch t := t.(type) {
 	case *ast.SelectorExpr:
-		if t.Sel.Name != "Pointer" {
-			return false
-		}
 		id, ok := t.X.(*ast.Ident)
 		if !ok {
 			return false
 		}
-		return id.Name == "unsafe"
+		if id.Name == "unsafe" && t.Sel.Name == "Pointer" {
+			return true
+		}
+		if id.Name == "C" && typedef["_Ctype_"+t.Sel.Name] != nil {
+			return true
+		}
+		return false
 	case *ast.Ident:
 		// TODO: This ignores shadowing.
 		switch t.Name {

src/cmd/compile/internal/amd64/ggen.go

@@ -10,9 +10,10 @@ import (
 	"cmd/internal/obj/x86"
 )
 
-func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
+// no floating point in note handlers on Plan 9
+var isPlan9 = obj.Getgoos() == "plan9"
 
+func defframe(ptxt *obj.Prog) {
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -31,8 +32,7 @@ func defframe(ptxt *obj.Prog) {
 	x0 := uint32(0)
 
 	// iterate through declarations - they are sorted in decreasing xoffset order.
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}
@@ -126,7 +126,7 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64, ax *uint32, x0 *uin
 			*ax = 1
 		}
 		p = appendpp(p, x86.AMOVQ, obj.TYPE_REG, x86.REG_AX, 0, obj.TYPE_MEM, x86.REG_SP, frame+lo)
-	} else if cnt <= int64(8*gc.Widthreg) {
+	} else if !isPlan9 && cnt <= int64(8*gc.Widthreg) {
 		if *x0 == 0 {
 			p = appendpp(p, x86.AXORPS, obj.TYPE_REG, x86.REG_X0, 0, obj.TYPE_REG, x86.REG_X0, 0)
 			*x0 = 1
@@ -139,12 +139,11 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64, ax *uint32, x0 *uin
 		if cnt%16 != 0 {
 			p = appendpp(p, x86.AMOVUPS, obj.TYPE_REG, x86.REG_X0, 0, obj.TYPE_MEM, x86.REG_SP, frame+lo+cnt-int64(16))
 		}
-	} else if !gc.Nacl && (cnt <= int64(128*gc.Widthreg)) {
+	} else if !gc.Nacl && !isPlan9 && (cnt <= int64(128*gc.Widthreg)) {
 		if *x0 == 0 {
 			p = appendpp(p, x86.AXORPS, obj.TYPE_REG, x86.REG_X0, 0, obj.TYPE_REG, x86.REG_X0, 0)
 			*x0 = 1
 		}
-
 		p = appendpp(p, leaptr, obj.TYPE_MEM, x86.REG_SP, frame+lo+dzDI(cnt), obj.TYPE_REG, x86.REG_DI, 0)
 		p = appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_ADDR, 0, dzOff(cnt))
 		p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg))
@@ -563,7 +562,7 @@ func clearfat(nl *gc.Node) {
 
 	w := nl.Type.Width
 
-	if w > 1024 || (gc.Nacl && w >= 64) {
+	if w > 1024 || (w >= 64 && (gc.Nacl || isPlan9)) {
 		var oldn1 gc.Node
 		var n1 gc.Node
 		savex(x86.REG_DI, &n1, &oldn1, nil, gc.Types[gc.Tptr])
@@ -630,6 +629,22 @@ func clearfat(nl *gc.Node) {
 }
 
 func clearfat_tail(n1 *gc.Node, b int64) {
+	if b >= 16 && isPlan9 {
+		var z gc.Node
+		gc.Nodconst(&z, gc.Types[gc.TUINT64], 0)
+		q := b / 8
+		for ; q > 0; q-- {
+			n1.Type = z.Type
+			gins(x86.AMOVQ, &z, n1)
+			n1.Xoffset += 8
+			b -= 8
+		}
+		if b != 0 {
+			n1.Xoffset -= 8 - b
+			gins(x86.AMOVQ, &z, n1)
+		}
+		return
+	}
 	if b >= 16 {
 		var vec_zero gc.Node
 		gc.Regalloc(&vec_zero, gc.Types[gc.TFLOAT64], nil)

src/cmd/compile/internal/amd64/peep.go

@@ -427,7 +427,7 @@ func elimshortmov(g *gc.Graph) {
 			}
 
 			if regtyp(&p.From) || p.From.Type == obj.TYPE_CONST {
-				// move or artihmetic into partial register.
+				// move or arithmetic into partial register.
 				// from another register or constant can be movl.
 				// we don't switch to 64-bit arithmetic if it can
 				// change how the carry bit is set (and the carry bit is needed).

src/cmd/compile/internal/arm/ggen.go

@@ -11,8 +11,6 @@ import (
 )
 
 func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
-
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -28,8 +26,7 @@ func defframe(ptxt *obj.Prog) {
 	hi := int64(0)
 	lo := hi
 	r0 := uint32(0)
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}

src/cmd/compile/internal/arm64/ggen.go

@@ -12,8 +12,6 @@ import (
 )
 
 func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
-
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -37,8 +35,7 @@ func defframe(ptxt *obj.Prog) {
 	lo := hi
 
 	// iterate through declarations - they are sorted in decreasing xoffset order.
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}
@@ -146,7 +143,7 @@ func dodiv(op gc.Op, nl *gc.Node, nr *gc.Node, res *gc.Node) {
 	// The hardware will generate undefined result.
 	// Also need to explicitly trap on division on zero,
 	// the hardware will silently generate undefined result.
-	// DIVW will leave unpredicable result in higher 32-bit,
+	// DIVW will leave unpredictable result in higher 32-bit,
 	// so always use DIVD/DIVDU.
 	t := nl.Type
 

src/cmd/compile/internal/gc/alg.go

@@ -0,0 +1,626 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gc
+
+import "fmt"
+
+const (
+	// These values are known by runtime.
+	ANOEQ = iota
+	AMEM0
+	AMEM8
+	AMEM16
+	AMEM32
+	AMEM64
+	AMEM128
+	ASTRING
+	AINTER
+	ANILINTER
+	AFLOAT32
+	AFLOAT64
+	ACPLX64
+	ACPLX128
+	AMEM = 100
+)
+
+func algtype(t *Type) int {
+	a := algtype1(t, nil)
+	if a == AMEM {
+		switch t.Width {
+		case 0:
+			return AMEM0
+		case 1:
+			return AMEM8
+		case 2:
+			return AMEM16
+		case 4:
+			return AMEM32
+		case 8:
+			return AMEM64
+		case 16:
+			return AMEM128
+		}
+	}
+
+	return a
+}
+
+func algtype1(t *Type, bad **Type) int {
+	if bad != nil {
+		*bad = nil
+	}
+	if t.Broke {
+		return AMEM
+	}
+	if t.Noalg {
+		return ANOEQ
+	}
+
+	switch t.Etype {
+	// will be defined later.
+	case TANY, TFORW:
+		*bad = t
+
+		return -1
+
+	case TINT8,
+		TUINT8,
+		TINT16,
+		TUINT16,
+		TINT32,
+		TUINT32,
+		TINT64,
+		TUINT64,
+		TINT,
+		TUINT,
+		TUINTPTR,
+		TBOOL,
+		TPTR32,
+		TPTR64,
+		TCHAN,
+		TUNSAFEPTR:
+		return AMEM
+
+	case TFUNC, TMAP:
+		if bad != nil {
+			*bad = t
+		}
+		return ANOEQ
+
+	case TFLOAT32:
+		return AFLOAT32
+
+	case TFLOAT64:
+		return AFLOAT64
+
+	case TCOMPLEX64:
+		return ACPLX64
+
+	case TCOMPLEX128:
+		return ACPLX128
+
+	case TSTRING:
+		return ASTRING
+
+	case TINTER:
+		if isnilinter(t) {
+			return ANILINTER
+		}
+		return AINTER
+
+	case TARRAY:
+		if Isslice(t) {
+			if bad != nil {
+				*bad = t
+			}
+			return ANOEQ
+		}
+
+		a := algtype1(t.Type, bad)
+		if a == ANOEQ || a == AMEM {
+			if a == ANOEQ && bad != nil {
+				*bad = t
+			}
+			return a
+		}
+
+		switch t.Bound {
+		case 0:
+			// We checked above that the element type is comparable.
+			return AMEM
+		case 1:
+			// Single-element array is same as its lone element.
+			return a
+		}
+
+		return -1 // needs special compare
+
+	case TSTRUCT:
+		if t.Type != nil && t.Type.Down == nil && !isblanksym(t.Type.Sym) {
+			// One-field struct is same as that one field alone.
+			return algtype1(t.Type.Type, bad)
+		}
+
+		ret := AMEM
+		var a int
+		for t1 := t.Type; t1 != nil; t1 = t1.Down {
+			// All fields must be comparable.
+			a = algtype1(t1.Type, bad)
+
+			if a == ANOEQ {
+				return ANOEQ
+			}
+
+			// Blank fields, padded fields, fields with non-memory
+			// equality need special compare.
+			if a != AMEM || isblanksym(t1.Sym) || ispaddedfield(t1, t.Width) {
+				ret = -1
+				continue
+			}
+		}
+
+		return ret
+	}
+
+	Fatalf("algtype1: unexpected type %v", t)
+	return 0
+}
+
+// Generate a helper function to compute the hash of a value of type t.
+func genhash(sym *Sym, t *Type) {
+	if Debug['r'] != 0 {
+		fmt.Printf("genhash %v %v\n", sym, t)
+	}
+
+	lineno = 1 // less confusing than end of input
+	dclcontext = PEXTERN
+	markdcl()
+
+	// func sym(p *T, h uintptr) uintptr
+	fn := Nod(ODCLFUNC, nil, nil)
+
+	fn.Func.Nname = newname(sym)
+	fn.Func.Nname.Class = PFUNC
+	tfn := Nod(OTFUNC, nil, nil)
+	fn.Func.Nname.Name.Param.Ntype = tfn
+
+	n := Nod(ODCLFIELD, newname(Lookup("p")), typenod(Ptrto(t)))
+	tfn.List = list(tfn.List, n)
+	np := n.Left
+	n = Nod(ODCLFIELD, newname(Lookup("h")), typenod(Types[TUINTPTR]))
+	tfn.List = list(tfn.List, n)
+	nh := n.Left
+	n = Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])) // return value
+	tfn.Rlist = list(tfn.Rlist, n)
+
+	funchdr(fn)
+	typecheck(&fn.Func.Nname.Name.Param.Ntype, Etype)
+
+	// genhash is only called for types that have equality but
+	// cannot be handled by the standard algorithms,
+	// so t must be either an array or a struct.
+	switch t.Etype {
+	default:
+		Fatalf("genhash %v", t)
+
+	case TARRAY:
+		if Isslice(t) {
+			Fatalf("genhash %v", t)
+		}
+
+		// An array of pure memory would be handled by the
+		// standard algorithm, so the element type must not be
+		// pure memory.
+		hashel := hashfor(t.Type)
+
+		n := Nod(ORANGE, nil, Nod(OIND, np, nil))
+		ni := newname(Lookup("i"))
+		ni.Type = Types[TINT]
+		n.List = list1(ni)
+		n.Colas = true
+		colasdefn(n.List, n)
+		ni = n.List.N
+
+		// h = hashel(&p[i], h)
+		call := Nod(OCALL, hashel, nil)
+
+		nx := Nod(OINDEX, np, ni)
+		nx.Bounded = true
+		na := Nod(OADDR, nx, nil)
+		na.Etype = 1 // no escape to heap
+		call.List = list(call.List, na)
+		call.List = list(call.List, nh)
+		n.Nbody = list(n.Nbody, Nod(OAS, nh, call))
+
+		fn.Nbody = list(fn.Nbody, n)
+
+	// Walk the struct using memhash for runs of AMEM
+	// and calling specific hash functions for the others.
+	case TSTRUCT:
+		var call *Node
+		var nx *Node
+		var na *Node
+		var hashel *Node
+
+		t1 := t.Type
+		for {
+			first, size, next := memrun(t, t1)
+			t1 = next
+
+			// Run memhash for fields up to this one.
+			if first != nil {
+				hashel = hashmem(first.Type)
+
+				// h = hashel(&p.first, size, h)
+				call = Nod(OCALL, hashel, nil)
+
+				nx = Nod(OXDOT, np, newname(first.Sym)) // TODO: fields from other packages?
+				na = Nod(OADDR, nx, nil)
+				na.Etype = 1 // no escape to heap
+				call.List = list(call.List, na)
+				call.List = list(call.List, nh)
+				call.List = list(call.List, Nodintconst(size))
+				fn.Nbody = list(fn.Nbody, Nod(OAS, nh, call))
+			}
+
+			if t1 == nil {
+				break
+			}
+			if isblanksym(t1.Sym) {
+				t1 = t1.Down
+				continue
+			}
+			if algtype1(t1.Type, nil) == AMEM {
+				// Our memory run might have been stopped by padding or a blank field.
+				// If the next field is memory-ish, it could be the start of a new run.
+				continue
+			}
+
+			hashel = hashfor(t1.Type)
+			call = Nod(OCALL, hashel, nil)
+			nx = Nod(OXDOT, np, newname(t1.Sym)) // TODO: fields from other packages?
+			na = Nod(OADDR, nx, nil)
+			na.Etype = 1 // no escape to heap
+			call.List = list(call.List, na)
+			call.List = list(call.List, nh)
+			fn.Nbody = list(fn.Nbody, Nod(OAS, nh, call))
+
+			t1 = t1.Down
+		}
+	}
+
+	r := Nod(ORETURN, nil, nil)
+	r.List = list(r.List, nh)
+	fn.Nbody = list(fn.Nbody, r)
+
+	if Debug['r'] != 0 {
+		dumplist("genhash body", fn.Nbody)
+	}
+
+	funcbody(fn)
+	Curfn = fn
+	fn.Func.Dupok = true
+	typecheck(&fn, Etop)
+	typechecklist(fn.Nbody, Etop)
+	Curfn = nil
+
+	// Disable safemode while compiling this code: the code we
+	// generate internally can refer to unsafe.Pointer.
+	// In this case it can happen if we need to generate an ==
+	// for a struct containing a reflect.Value, which itself has
+	// an unexported field of type unsafe.Pointer.
+	old_safemode := safemode
+
+	safemode = 0
+	funccompile(fn)
+	safemode = old_safemode
+}
+
+func hashfor(t *Type) *Node {
+	var sym *Sym
+
+	a := algtype1(t, nil)
+	switch a {
+	case AMEM:
+		Fatalf("hashfor with AMEM type")
+
+	case AINTER:
+		sym = Pkglookup("interhash", Runtimepkg)
+
+	case ANILINTER:
+		sym = Pkglookup("nilinterhash", Runtimepkg)
+
+	case ASTRING:
+		sym = Pkglookup("strhash", Runtimepkg)
+
+	case AFLOAT32:
+		sym = Pkglookup("f32hash", Runtimepkg)
+
+	case AFLOAT64:
+		sym = Pkglookup("f64hash", Runtimepkg)
+
+	case ACPLX64:
+		sym = Pkglookup("c64hash", Runtimepkg)
+
+	case ACPLX128:
+		sym = Pkglookup("c128hash", Runtimepkg)
+
+	default:
+		sym = typesymprefix(".hash", t)
+	}
+
+	n := newname(sym)
+	n.Class = PFUNC
+	tfn := Nod(OTFUNC, nil, nil)
+	tfn.List = list(tfn.List, Nod(ODCLFIELD, nil, typenod(Ptrto(t))))
+	tfn.List = list(tfn.List, Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])))
+	tfn.Rlist = list(tfn.Rlist, Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])))
+	typecheck(&tfn, Etype)
+	n.Type = tfn.Type
+	return n
+}
+
+// geneq generates a helper function to
+// check equality of two values of type t.
+func geneq(sym *Sym, t *Type) {
+	if Debug['r'] != 0 {
+		fmt.Printf("geneq %v %v\n", sym, t)
+	}
+
+	lineno = 1 // less confusing than end of input
+	dclcontext = PEXTERN
+	markdcl()
+
+	// func sym(p, q *T) bool
+	fn := Nod(ODCLFUNC, nil, nil)
+
+	fn.Func.Nname = newname(sym)
+	fn.Func.Nname.Class = PFUNC
+	tfn := Nod(OTFUNC, nil, nil)
+	fn.Func.Nname.Name.Param.Ntype = tfn
+
+	n := Nod(ODCLFIELD, newname(Lookup("p")), typenod(Ptrto(t)))
+	tfn.List = list(tfn.List, n)
+	np := n.Left
+	n = Nod(ODCLFIELD, newname(Lookup("q")), typenod(Ptrto(t)))
+	tfn.List = list(tfn.List, n)
+	nq := n.Left
+	n = Nod(ODCLFIELD, nil, typenod(Types[TBOOL]))
+	tfn.Rlist = list(tfn.Rlist, n)
+
+	funchdr(fn)
+
+	// geneq is only called for types that have equality but
+	// cannot be handled by the standard algorithms,
+	// so t must be either an array or a struct.
+	switch t.Etype {
+	default:
+		Fatalf("geneq %v", t)
+
+	case TARRAY:
+		if Isslice(t) {
+			Fatalf("geneq %v", t)
+		}
+
+		// An array of pure memory would be handled by the
+		// standard memequal, so the element type must not be
+		// pure memory.  Even if we unrolled the range loop,
+		// each iteration would be a function call, so don't bother
+		// unrolling.
+		nrange := Nod(ORANGE, nil, Nod(OIND, np, nil))
+
+		ni := newname(Lookup("i"))
+		ni.Type = Types[TINT]
+		nrange.List = list1(ni)
+		nrange.Colas = true
+		colasdefn(nrange.List, nrange)
+		ni = nrange.List.N
+
+		// if p[i] != q[i] { return false }
+		nx := Nod(OINDEX, np, ni)
+
+		nx.Bounded = true
+		ny := Nod(OINDEX, nq, ni)
+		ny.Bounded = true
+
+		nif := Nod(OIF, nil, nil)
+		nif.Left = Nod(ONE, nx, ny)
+		r := Nod(ORETURN, nil, nil)
+		r.List = list(r.List, Nodbool(false))
+		nif.Nbody = list(nif.Nbody, r)
+		nrange.Nbody = list(nrange.Nbody, nif)
+		fn.Nbody = list(fn.Nbody, nrange)
+
+		// return true
+		ret := Nod(ORETURN, nil, nil)
+		ret.List = list(ret.List, Nodbool(true))
+		fn.Nbody = list(fn.Nbody, ret)
+
+	// Walk the struct using memequal for runs of AMEM
+	// and calling specific equality tests for the others.
+	// Skip blank-named fields.
+	case TSTRUCT:
+		var conjuncts []*Node
+
+		t1 := t.Type
+		for {
+			first, size, next := memrun(t, t1)
+			t1 = next
+
+			// Run memequal for fields up to this one.
+			// TODO(rsc): All the calls to newname are wrong for
+			// cross-package unexported fields.
+			if first != nil {
+				if first.Down == t1 {
+					conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
+				} else if first.Down.Down == t1 {
+					conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
+					first = first.Down
+					if !isblanksym(first.Sym) {
+						conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
+					}
+				} else {
+					// More than two fields: use memequal.
+					conjuncts = append(conjuncts, eqmem(np, nq, newname(first.Sym), size))
+				}
+			}
+
+			if t1 == nil {
+				break
+			}
+			if isblanksym(t1.Sym) {
+				t1 = t1.Down
+				continue
+			}
+			if algtype1(t1.Type, nil) == AMEM {
+				// Our memory run might have been stopped by padding or a blank field.
+				// If the next field is memory-ish, it could be the start of a new run.
+				continue
+			}
+
+			// Check this field, which is not just memory.
+			conjuncts = append(conjuncts, eqfield(np, nq, newname(t1.Sym)))
+			t1 = t1.Down
+		}
+
+		var and *Node
+		switch len(conjuncts) {
+		case 0:
+			and = Nodbool(true)
+		case 1:
+			and = conjuncts[0]
+		default:
+			and = Nod(OANDAND, conjuncts[0], conjuncts[1])
+			for _, conjunct := range conjuncts[2:] {
+				and = Nod(OANDAND, and, conjunct)
+			}
+		}
+
+		ret := Nod(ORETURN, nil, nil)
+		ret.List = list(ret.List, and)
+		fn.Nbody = list(fn.Nbody, ret)
+	}
+
+	if Debug['r'] != 0 {
+		dumplist("geneq body", fn.Nbody)
+	}
+
+	funcbody(fn)
+	Curfn = fn
+	fn.Func.Dupok = true
+	typecheck(&fn, Etop)
+	typechecklist(fn.Nbody, Etop)
+	Curfn = nil
+
+	// Disable safemode while compiling this code: the code we
+	// generate internally can refer to unsafe.Pointer.
+	// In this case it can happen if we need to generate an ==
+	// for a struct containing a reflect.Value, which itself has
+	// an unexported field of type unsafe.Pointer.
+	old_safemode := safemode
+	safemode = 0
+
+	// Disable checknils while compiling this code.
+	// We are comparing a struct or an array,
+	// neither of which can be nil, and our comparisons
+	// are shallow.
+	Disable_checknil++
+
+	funccompile(fn)
+
+	safemode = old_safemode
+	Disable_checknil--
+}
+
+// eqfield returns the node
+// 	p.field == q.field
+func eqfield(p *Node, q *Node, field *Node) *Node {
+	nx := Nod(OXDOT, p, field)
+	ny := Nod(OXDOT, q, field)
+	ne := Nod(OEQ, nx, ny)
+	return ne
+}
+
+// eqmem returns the node
+// 	memequal(&p.field, &q.field [, size])
+func eqmem(p *Node, q *Node, field *Node, size int64) *Node {
+	var needsize int
+
+	nx := Nod(OADDR, Nod(OXDOT, p, field), nil)
+	nx.Etype = 1 // does not escape
+	ny := Nod(OADDR, Nod(OXDOT, q, field), nil)
+	ny.Etype = 1 // does not escape
+	typecheck(&nx, Erv)
+	typecheck(&ny, Erv)
+
+	call := Nod(OCALL, eqmemfunc(size, nx.Type.Type, &needsize), nil)
+	call.List = list(call.List, nx)
+	call.List = list(call.List, ny)
+	if needsize != 0 {
+		call.List = list(call.List, Nodintconst(size))
+	}
+
+	return call
+}
+
+func eqmemfunc(size int64, type_ *Type, needsize *int) *Node {
+	var fn *Node
+
+	switch size {
+	default:
+		fn = syslook("memequal", 1)
+		*needsize = 1
+
+	case 1, 2, 4, 8, 16:
+		buf := fmt.Sprintf("memequal%d", int(size)*8)
+		fn = syslook(buf, 1)
+		*needsize = 0
+	}
+
+	substArgTypes(fn, type_, type_)
+	return fn
+}
+
+// memrun finds runs of struct fields for which memory-only algs are appropriate.
+// t is the parent struct type, and field is the field at which to start.
+// first is the first field in the memory run.
+// size is the length in bytes of the memory included in the run.
+// next is the next field after the memory run.
+func memrun(t *Type, field *Type) (first *Type, size int64, next *Type) {
+	var offend int64
+	for {
+		if field == nil || algtype1(field.Type, nil) != AMEM || isblanksym(field.Sym) {
+			break
+		}
+		offend = field.Width + field.Type.Width
+		if first == nil {
+			first = field
+		}
+
+		// If it's a memory field but it's padded, stop here.
+		if ispaddedfield(field, t.Width) {
+			field = field.Down
+			break
+		}
+		field = field.Down
+	}
+	if first != nil {
+		size = offend - first.Width // first.Width is offset
+	}
+	return first, size, field
+}
+
+// ispaddedfield reports whether the given field
+// is followed by padding. For the case where t is
+// the last field, total gives the size of the enclosing struct.
+func ispaddedfield(t *Type, total int64) bool {
+	if t.Etype != TFIELD {
+		Fatalf("ispaddedfield called non-field %v", t)
+	}
+	if t.Down == nil {
+		return t.Width+t.Type.Width != total
+	}
+	return t.Width+t.Type.Width != t.Down.Width
+}

src/cmd/compile/internal/gc/bexport.go

@@ -72,7 +72,7 @@ amount of space to hold the list without the need to grow it later.
 
 All integer values use a variable-length encoding for compact representation.
 
-If debugFormat is set, each integer and string value is preceeded by a marker
+If debugFormat is set, each integer and string value is preceded by a marker
 and position information in the encoding. This mechanism permits an importer
 to recognize immediately when it is out of sync. The importer recognizes this
 mode automatically (i.e., it can import export data produced with debugging

src/cmd/compile/internal/gc/bimport.go

@@ -240,10 +240,9 @@ func (p *importer) typ() *Type {
 			{
 				saved := structpkg
 				structpkg = tsym.Pkg
-				addmethod(sym, n.Type, false, nointerface)
+				addmethod(sym, n.Type, false, false)
 				structpkg = saved
 			}
-			nointerface = false
 			funchdr(n)
 
 			// (comment from go.y)

src/cmd/compile/internal/gc/cgen.go

@@ -781,7 +781,7 @@ var sys_wbptr *Node
 
 func cgen_wbptr(n, res *Node) {
 	if Curfn != nil {
-		if Curfn.Func.Nowritebarrier {
+		if Curfn.Func.Pragma&Nowritebarrier != 0 {
 			Yyerror("write barrier prohibited")
 		}
 		if Curfn.Func.WBLineno == 0 {
@@ -831,7 +831,7 @@ func cgen_wbptr(n, res *Node) {
 
 func cgen_wbfat(n, res *Node) {
 	if Curfn != nil {
-		if Curfn.Func.Nowritebarrier {
+		if Curfn.Func.Pragma&Nowritebarrier != 0 {
 			Yyerror("write barrier prohibited")
 		}
 		if Curfn.Func.WBLineno == 0 {
@@ -2263,9 +2263,9 @@ func sgen_wb(n *Node, ns *Node, w int64, wb bool) {
 	// If copying .args, that's all the results, so record definition sites
 	// for them for the liveness analysis.
 	if ns.Op == ONAME && ns.Sym.Name == ".args" {
-		for l := Curfn.Func.Dcl; l != nil; l = l.Next {
-			if l.N.Class == PPARAMOUT {
-				Gvardef(l.N)
+		for _, ln := range Curfn.Func.Dcl {
+			if ln.Class == PPARAMOUT {
+				Gvardef(ln)
 			}
 		}
 	}
@@ -2621,7 +2621,7 @@ func cgen_ret(n *Node) {
 	if hasdefer {
 		Ginscall(Deferreturn, 0)
 	}
-	Genlist(Curfn.Func.Exit)
+	Genslice(Curfn.Func.Exit.Slice())
 	p := Thearch.Gins(obj.ARET, nil, nil)
 	if n != nil && n.Op == ORETJMP {
 		p.To.Type = obj.TYPE_MEM

src/cmd/compile/internal/gc/closure.go

@@ -67,9 +67,7 @@ func closurebody(body *NodeList) *Node {
 	// ordinary ones in the symbol table; see oldname.
 	// unhook them.
 	// make the list of pointers for the closure call.
-	var v *Node
-	for l := func_.Func.Cvars; l != nil; l = l.Next {
-		v = l.N
+	for _, v := range func_.Func.Cvars.Slice() {
 		v.Name.Param.Closure.Name.Param.Closure = v.Name.Param.Outer
 		v.Name.Param.Outerexpr = oldname(v.Sym)
 	}
@@ -78,10 +76,8 @@ func closurebody(body *NodeList) *Node {
 }
 
 func typecheckclosure(func_ *Node, top int) {
-	var n *Node
-
-	for l := func_.Func.Cvars; l != nil; l = l.Next {
-		n = l.N.Name.Param.Closure
+	for _, ln := range func_.Func.Cvars.Slice() {
+		n := ln.Name.Param.Closure
 		if !n.Name.Captured {
 			n.Name.Captured = true
 			if n.Name.Decldepth == 0 {
@@ -96,9 +92,9 @@ func typecheckclosure(func_ *Node, top int) {
 		}
 	}
 
-	for l := func_.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op == ONAME && (l.N.Class == PPARAM || l.N.Class == PPARAMOUT) {
-			l.N.Name.Decldepth = 1
+	for _, ln := range func_.Func.Dcl {
+		if ln.Op == ONAME && (ln.Class == PPARAM || ln.Class == PPARAMOUT) {
+			ln.Name.Decldepth = 1
 		}
 	}
 
@@ -198,7 +194,8 @@ func makeclosure(func_ *Node) *Node {
 	makefuncsym(xfunc.Func.Nname.Sym)
 
 	xfunc.Nbody = func_.Nbody
-	xfunc.Func.Dcl = concat(func_.Func.Dcl, xfunc.Func.Dcl)
+	xfunc.Func.Dcl = append(func_.Func.Dcl, xfunc.Func.Dcl...)
+	func_.Func.Dcl = nil
 	if xfunc.Nbody == nil {
 		Fatalf("empty body - won't generate any code")
 	}
@@ -220,16 +217,14 @@ func makeclosure(func_ *Node) *Node {
 // We use value capturing for values <= 128 bytes that are never reassigned
 // after capturing (effectively constant).
 func capturevars(xfunc *Node) {
-	var v *Node
 	var outer *Node
 
 	lno := int(lineno)
 	lineno = xfunc.Lineno
 
 	func_ := xfunc.Func.Closure
-	func_.Func.Enter = nil
-	for l := func_.Func.Cvars; l != nil; l = l.Next {
-		v = l.N
+	func_.Func.Enter.Set(nil)
+	for _, v := range func_.Func.Cvars.Slice() {
 		if v.Type == nil {
 			// if v->type is nil, it means v looked like it was
 			// going to be used in the closure but wasn't.
@@ -270,7 +265,7 @@ func capturevars(xfunc *Node) {
 		}
 
 		typecheck(&outer, Erv)
-		func_.Func.Enter = list(func_.Func.Enter, outer)
+		func_.Func.Enter.Append(outer)
 	}
 
 	lineno = int32(lno)
@@ -309,11 +304,9 @@ func transformclosure(xfunc *Node) {
 		original_dcl := xfunc.Func.Dcl
 		xfunc.Func.Dcl = nil
 
-		var v *Node
 		var addr *Node
 		var fld *Type
-		for l := func_.Func.Cvars; l != nil; l = l.Next {
-			v = l.N
+		for _, v := range func_.Func.Cvars.Slice() {
 			if v.Op == OXXX {
 				continue
 			}
@@ -341,13 +334,13 @@ func transformclosure(xfunc *Node) {
 			fld.Sym = fld.Nname.Sym
 
 			// Declare the new param and add it the first part of the input arguments.
-			xfunc.Func.Dcl = list(xfunc.Func.Dcl, fld.Nname)
+			xfunc.Func.Dcl = append(xfunc.Func.Dcl, fld.Nname)
 
 			*param = fld
 			param = &fld.Down
 		}
 		*param = original_args
-		xfunc.Func.Dcl = concat(xfunc.Func.Dcl, original_dcl)
+		xfunc.Func.Dcl = append(xfunc.Func.Dcl, original_dcl...)
 
 		// Recalculate param offsets.
 		if f.Type.Width > 0 {
@@ -357,19 +350,14 @@ func transformclosure(xfunc *Node) {
 		xfunc.Type = f.Type // update type of ODCLFUNC
 	} else {
 		// The closure is not called, so it is going to stay as closure.
-		nvar := 0
-
-		var body *NodeList
+		var body []*Node
 		offset := int64(Widthptr)
 		var addr *Node
-		var v *Node
 		var cv *Node
-		for l := func_.Func.Cvars; l != nil; l = l.Next {
-			v = l.N
+		for _, v := range func_.Func.Cvars.Slice() {
 			if v.Op == OXXX {
 				continue
 			}
-			nvar++
 
 			// cv refers to the field inside of closure OSTRUCTLIT.
 			cv = Nod(OCLOSUREVAR, nil, nil)
@@ -386,8 +374,8 @@ func transformclosure(xfunc *Node) {
 				// If it is a small variable captured by value, downgrade it to PAUTO.
 				v.Class = PAUTO
 				v.Ullman = 1
-				xfunc.Func.Dcl = list(xfunc.Func.Dcl, v)
-				body = list(body, Nod(OAS, v, cv))
+				xfunc.Func.Dcl = append(xfunc.Func.Dcl, v)
+				body = append(body, Nod(OAS, v, cv))
 			} else {
 				// Declare variable holding addresses taken from closure
 				// and initialize in entry prologue.
@@ -396,19 +384,21 @@ func transformclosure(xfunc *Node) {
 				addr.Class = PAUTO
 				addr.Used = true
 				addr.Name.Curfn = xfunc
-				xfunc.Func.Dcl = list(xfunc.Func.Dcl, addr)
+				xfunc.Func.Dcl = append(xfunc.Func.Dcl, addr)
 				v.Name.Heapaddr = addr
 				if v.Name.Byval {
 					cv = Nod(OADDR, cv, nil)
 				}
-				body = list(body, Nod(OAS, addr, cv))
+				body = append(body, Nod(OAS, addr, cv))
 			}
 		}
 
-		typechecklist(body, Etop)
-		walkstmtlist(body)
-		xfunc.Func.Enter = body
-		xfunc.Func.Needctxt = nvar > 0
+		if len(body) > 0 {
+			typecheckslice(body, Etop)
+			walkstmtslice(body)
+			xfunc.Func.Enter.Set(body)
+			xfunc.Func.Needctxt = true
+		}
 	}
 
 	lineno = int32(lno)
@@ -416,7 +406,7 @@ func transformclosure(xfunc *Node) {
 
 func walkclosure(func_ *Node, init **NodeList) *Node {
 	// If no closure vars, don't bother wrapping.
-	if func_.Func.Cvars == nil {
+	if len(func_.Func.Cvars.Slice()) == 0 {
 		return func_.Func.Closure.Func.Nname
 	}
 
@@ -438,9 +428,7 @@ func walkclosure(func_ *Node, init **NodeList) *Node {
 
 	typ.List = list1(Nod(ODCLFIELD, newname(Lookup(".F")), typenod(Types[TUINTPTR])))
 	var typ1 *Node
-	var v *Node
-	for l := func_.Func.Cvars; l != nil; l = l.Next {
-		v = l.N
+	for _, v := range func_.Func.Cvars.Slice() {
 		if v.Op == OXXX {
 			continue
 		}
@@ -454,7 +442,7 @@ func walkclosure(func_ *Node, init **NodeList) *Node {
 	clos := Nod(OCOMPLIT, nil, Nod(OIND, typ, nil))
 	clos.Esc = func_.Esc
 	clos.Right.Implicit = true
-	clos.List = concat(list1(Nod(OCFUNC, func_.Func.Closure.Func.Nname, nil)), func_.Func.Enter)
+	clos.List = concat(list1(Nod(OCFUNC, func_.Func.Closure.Func.Nname, nil)), func_.Func.Enter.NodeList())
 
 	// Force type conversion from *struct to the func type.
 	clos = Nod(OCONVNOP, clos, nil)
@@ -551,7 +539,7 @@ func makepartialcall(fn *Node, t0 *Type, meth *Node) *Node {
 		n = newname(Lookupf("a%d", i))
 		i++
 		n.Class = PPARAM
-		xfunc.Func.Dcl = list(xfunc.Func.Dcl, n)
+		xfunc.Func.Dcl = append(xfunc.Func.Dcl, n)
 		callargs = list(callargs, n)
 		fld = Nod(ODCLFIELD, n, typenod(t.Type))
 		if t.Isddd {
@@ -570,7 +558,7 @@ func makepartialcall(fn *Node, t0 *Type, meth *Node) *Node {
 		n = newname(Lookupf("r%d", i))
 		i++
 		n.Class = PPARAMOUT
-		xfunc.Func.Dcl = list(xfunc.Func.Dcl, n)
+		xfunc.Func.Dcl = append(xfunc.Func.Dcl, n)
 		retargs = list(retargs, n)
 		l = list(l, Nod(ODCLFIELD, n, typenod(t.Type)))
 	}
@@ -601,7 +589,7 @@ func makepartialcall(fn *Node, t0 *Type, meth *Node) *Node {
 	ptr.Used = true
 	ptr.Name.Curfn = xfunc
 	ptr.Xoffset = 0
-	xfunc.Func.Dcl = list(xfunc.Func.Dcl, ptr)
+	xfunc.Func.Dcl = append(xfunc.Func.Dcl, ptr)
 	var body *NodeList
 	if Isptr[rcvrtype.Etype] || Isinter(rcvrtype) {
 		ptr.Name.Param.Ntype = typenod(rcvrtype)

src/cmd/compile/internal/gc/dcl.go

@@ -187,7 +187,7 @@ func declare(n *Node, ctxt Class) {
 			Fatalf("automatic outside function")
 		}
 		if Curfn != nil {
-			Curfn.Func.Dcl = list(Curfn.Func.Dcl, n)
+			Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
 		}
 		if n.Op == OTYPE {
 			declare_typegen++
@@ -426,7 +426,7 @@ func oldname(s *Sym) *Node {
 			n.Name.Param.Closure = c
 			c.Name.Param.Closure = n
 			c.Xoffset = 0
-			Curfn.Func.Cvars = list(Curfn.Func.Cvars, c)
+			Curfn.Func.Cvars.Append(c)
 		}
 
 		// return ref to closure var, not original
@@ -1449,8 +1449,13 @@ func funccompile(n *Node) {
 	Funcdepth = n.Func.Depth + 1
 	compile(n)
 	Curfn = nil
+	Pc = nil
+	continpc = nil
+	breakpc = nil
 	Funcdepth = 0
 	dclcontext = PEXTERN
+	flushdata()
+	obj.Flushplist(Ctxt) // convert from Prog list to machine code
 }
 
 func funcsym(s *Sym) *Sym {
@@ -1525,7 +1530,7 @@ func checknowritebarrierrec() {
 
 		// Check nowritebarrierrec functions.
 		for _, n := range list {
-			if !n.Func.Nowritebarrierrec {
+			if n.Func.Pragma&Nowritebarrierrec == 0 {
 				continue
 			}
 			call, hasWB := c.best[n]

src/cmd/compile/internal/gc/esc.go

@@ -476,35 +476,35 @@ func escfunc(e *EscState, func_ *Node) {
 	savefn := Curfn
 	Curfn = func_
 
-	for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-		if ll.N.Op != ONAME {
+	for _, ln := range Curfn.Func.Dcl {
+		if ln.Op != ONAME {
 			continue
 		}
-		llNE := e.nodeEscState(ll.N)
-		switch ll.N.Class {
+		llNE := e.nodeEscState(ln)
+		switch ln.Class {
 		// out params are in a loopdepth between the sink and all local variables
 		case PPARAMOUT:
 			llNE.Escloopdepth = 0
 
 		case PPARAM:
 			llNE.Escloopdepth = 1
-			if ll.N.Type != nil && !haspointers(ll.N.Type) {
+			if ln.Type != nil && !haspointers(ln.Type) {
 				break
 			}
 			if Curfn.Nbody == nil && !Curfn.Noescape {
-				ll.N.Esc = EscHeap
+				ln.Esc = EscHeap
 			} else {
-				ll.N.Esc = EscNone // prime for escflood later
+				ln.Esc = EscNone // prime for escflood later
 			}
-			e.noesc = list(e.noesc, ll.N)
+			e.noesc = list(e.noesc, ln)
 		}
 	}
 
 	// in a mutually recursive group we lose track of the return values
 	if e.recursive {
-		for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-			if ll.N.Op == ONAME && ll.N.Class == PPARAMOUT {
-				escflows(e, &e.theSink, ll.N)
+		for _, ln := range Curfn.Func.Dcl {
+			if ln.Op == ONAME && ln.Class == PPARAMOUT {
+				escflows(e, &e.theSink, ln)
 			}
 		}
 	}
@@ -779,11 +779,14 @@ func esc(e *EscState, n *Node, up *Node) {
 			ll = e.nodeEscState(n.List.N).Escretval
 		}
 
-		for lr := Curfn.Func.Dcl; lr != nil && ll != nil; lr = lr.Next {
-			if lr.N.Op != ONAME || lr.N.Class != PPARAMOUT {
+		for _, lrn := range Curfn.Func.Dcl {
+			if ll == nil {
+				break
+			}
+			if lrn.Op != ONAME || lrn.Class != PPARAMOUT {
 				continue
 			}
-			escassign(e, lr.N, ll.N)
+			escassign(e, lrn, ll.N)
 			ll = ll.Next
 		}
 
@@ -861,9 +864,7 @@ func esc(e *EscState, n *Node, up *Node) {
 		// Link addresses of captured variables to closure.
 	case OCLOSURE:
 		var a *Node
-		var v *Node
-		for ll := n.Func.Cvars; ll != nil; ll = ll.Next {
-			v = ll.N
+		for _, v := range n.Func.Cvars.Slice() {
 			if v.Op == OXXX { // unnamed out argument; see dcl.go:/^funcargs
 				continue
 			}
@@ -1870,16 +1871,16 @@ func esctag(e *EscState, func_ *Node) {
 	savefn := Curfn
 	Curfn = func_
 
-	for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-		if ll.N.Op != ONAME {
+	for _, ln := range Curfn.Func.Dcl {
+		if ln.Op != ONAME {
 			continue
 		}
 
-		switch ll.N.Esc & EscMask {
+		switch ln.Esc & EscMask {
 		case EscNone, // not touched by escflood
 			EscReturn:
-			if haspointers(ll.N.Type) { // don't bother tagging for scalars
-				ll.N.Name.Param.Field.Note = mktag(int(ll.N.Esc))
+			if haspointers(ln.Type) { // don't bother tagging for scalars
+				ln.Name.Param.Field.Note = mktag(int(ln.Esc))
 			}
 
 		case EscHeap, // touched by escflood, moved to heap

src/cmd/compile/internal/gc/fmt.go

@@ -1730,10 +1730,42 @@ func Hconv(l *NodeList, flag int) string {
 	return buf.String()
 }
 
+func Hconvslice(l []*Node, flag int) string {
+	if len(l) == 0 && fmtmode == FDbg {
+		return "<nil>"
+	}
+
+	sf := flag
+	sm, sb := setfmode(&flag)
+	sep := "; "
+	if fmtmode == FDbg {
+		sep = "\n"
+	} else if flag&obj.FmtComma != 0 {
+		sep = ", "
+	}
+
+	var buf bytes.Buffer
+	for i, n := range l {
+		buf.WriteString(Nconv(n, 0))
+		if i+1 < len(l) {
+			buf.WriteString(sep)
+		}
+	}
+
+	flag = sf
+	fmtbody = sb
+	fmtmode = sm
+	return buf.String()
+}
+
 func dumplist(s string, l *NodeList) {
 	fmt.Printf("%s%v\n", s, Hconv(l, obj.FmtSign))
 }
 
+func dumpslice(s string, l []*Node) {
+	fmt.Printf("%s%v\n", s, Hconvslice(l, obj.FmtSign))
+}
+
 func Dump(s string, n *Node) {
 	fmt.Printf("%s [%p]%v\n", s, n, Nconv(n, obj.FmtSign))
 }

src/cmd/compile/internal/gc/gen.go

@@ -76,6 +76,9 @@ func addrescapes(n *Node) {
 			oldfn := Curfn
 
 			Curfn = n.Name.Curfn
+			if Curfn.Func.Closure != nil && Curfn.Op == OCLOSURE {
+				Curfn = Curfn.Func.Closure
+			}
 			n.Name.Heapaddr = temp(Ptrto(n.Type))
 			buf := fmt.Sprintf("&%v", n.Sym)
 			n.Name.Heapaddr.Sym = Lookup(buf)
@@ -218,6 +221,12 @@ func Genlist(l *NodeList) {
 	}
 }
 
+func Genslice(l []*Node) {
+	for _, n := range l {
+		gen(n)
+	}
+}
+
 // generate code to start new proc running call n.
 func cgen_proc(n *Node, proc int) {
 	switch n.Left.Op {
@@ -587,6 +596,10 @@ func Tempname(nn *Node, t *Type) {
 	if Curfn == nil {
 		Fatalf("no curfn for tempname")
 	}
+	if Curfn.Func.Closure != nil && Curfn.Op == OCLOSURE {
+		Dump("Tempname", Curfn)
+		Fatalf("adding tempname to wrong closure function")
+	}
 
 	if t == nil {
 		Yyerror("tempname called with nil type")
@@ -606,7 +619,7 @@ func Tempname(nn *Node, t *Type) {
 	n.Ullman = 1
 	n.Esc = EscNever
 	n.Name.Curfn = Curfn
-	Curfn.Func.Dcl = list(Curfn.Func.Dcl, n)
+	Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
 
 	dowidth(t)
 	n.Xoffset = 0

src/cmd/compile/internal/gc/global_test.go

@@ -11,7 +11,8 @@ import (
 	"log"
 	"os"
 	"os/exec"
-	"path"
+	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -28,7 +29,7 @@ func TestScanfRemoval(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	// Create source.
-	src := path.Join(dir, "test.go")
+	src := filepath.Join(dir, "test.go")
 	f, err := os.Create(src)
 	if err != nil {
 		log.Fatalf("could not create source file: %v", err)
@@ -43,7 +44,7 @@ func main() {
 	f.Close()
 
 	// Name of destination.
-	dst := path.Join(dir, "test")
+	dst := filepath.Join(dir, "test")
 
 	// Compile source.
 	cmd := exec.Command("go", "build", "-o", dst, src)
@@ -62,3 +63,53 @@ func main() {
 		log.Fatalf("scanf code not removed from helloworld")
 	}
 }
+
+// Make sure -S prints assembly code.  See issue 14515.
+func TestDashS(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+
+	// Make a directory to work in.
+	dir, err := ioutil.TempDir("", "issue14515-")
+	if err != nil {
+		log.Fatalf("could not create directory: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	// Create source.
+	src := filepath.Join(dir, "test.go")
+	f, err := os.Create(src)
+	if err != nil {
+		log.Fatalf("could not create source file: %v", err)
+	}
+	f.Write([]byte(`
+package main
+import "fmt"
+func main() {
+	fmt.Println("hello world")
+}
+`))
+	f.Close()
+
+	// Compile source.
+	cmd := exec.Command("go", "build", "-gcflags", "-S", "-o", filepath.Join(dir, "test"), src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Fatalf("could not build target: %v", err)
+	}
+
+	patterns := []string{
+		// It is hard to look for actual instructions in an
+		// arch-independent way.  So we'll just look for
+		// pseudo-ops that are arch-independent.
+		"\tTEXT\t",
+		"\tFUNCDATA\t",
+		"\tPCDATA\t",
+	}
+	outstr := string(out)
+	for _, p := range patterns {
+		if !strings.Contains(outstr, p) {
+			println(outstr)
+			panic("can't find pattern " + p)
+		}
+	}
+}

src/cmd/compile/internal/gc/go.go

@@ -26,25 +26,6 @@ const (
 	MaxStackVarSize = 10 * 1024 * 1024
 )
 
-const (
-	// These values are known by runtime.
-	ANOEQ = iota
-	AMEM0
-	AMEM8
-	AMEM16
-	AMEM32
-	AMEM64
-	AMEM128
-	ASTRING
-	AINTER
-	ANILINTER
-	AFLOAT32
-	AFLOAT64
-	ACPLX64
-	ACPLX128
-	AMEM = 100
-)
-
 const (
 	// Maximum size in bits for Mpints before signalling
 	// overflow and also mantissa precision for Mpflts.
@@ -122,10 +103,9 @@ type Pkg struct {
 }
 
 type Sym struct {
-	Lexical   uint16
 	Flags     uint8
-	Link      *Sym
 	Uniqgen   uint32
+	Link      *Sym
 	Importdef *Pkg   // where imported definition was found
 	Linkname  string // link name
 
@@ -425,12 +405,13 @@ var sizeof_String int // runtime sizeof(String)
 
 var dotlist [10]Dlist // size is max depth of embeddeds
 
+// lexlineno is the line number _after_ the most recently read rune.
+// In particular, it's advanced (or rewound) as newlines are read (or unread).
 var lexlineno int32
 
+// lineno is the line number at the start of the most recently lexed token.
 var lineno int32
 
-var prevlineno int32
-
 var pragcgobuf string
 
 var infile string
@@ -616,23 +597,10 @@ var flag_largemodel int
 // when the race detector is enabled.
 var instrumenting bool
 
-// Pending annotations for next func declaration.
-var (
-	noescape          bool
-	noinline          bool
-	norace            bool
-	nosplit           bool
-	nowritebarrier    bool
-	nowritebarrierrec bool
-	systemstack       bool
-)
-
 var debuglive int
 
 var Ctxt *obj.Link
 
-var nointerface bool
-
 var writearchive int
 
 var bstdout obj.Biobuf

src/cmd/compile/internal/gc/gsubr.go

@@ -173,6 +173,18 @@ func dumpdata() {
 	Clearp(Pc)
 }
 
+func flushdata() {
+	if dfirst == nil {
+		return
+	}
+	newplist()
+	*Pc = *dfirst
+	Pc = dpc
+	Clearp(Pc)
+	dfirst = nil
+	dpc = nil
+}
+
 // Fixup instructions after allocauto (formerly compactframe) has moved all autos around.
 func fixautoused(p *obj.Prog) {
 	for lp := &p; ; {
@@ -554,9 +566,7 @@ func nodarg(t *Type, fp int) *Node {
 	}
 
 	if fp == 1 || fp == -1 {
-		var n *Node
-		for l := Curfn.Func.Dcl; l != nil; l = l.Next {
-			n = l.N
+		for _, n := range Curfn.Func.Dcl {
 			if (n.Class == PPARAM || n.Class == PPARAMOUT) && !isblanksym(t.Sym) && n.Sym == t.Sym {
 				return n
 			}

src/cmd/compile/internal/gc/inl.go

@@ -107,7 +107,7 @@ func caninl(fn *Node) {
 	}
 
 	// If marked "go:noinline", don't inline
-	if fn.Func.Noinline {
+	if fn.Func.Pragma&Noinline != 0 {
 		return
 	}
 
@@ -150,7 +150,10 @@ func caninl(fn *Node) {
 
 	fn.Func.Nname.Func.Inl = fn.Nbody
 	fn.Nbody = inlcopylist(fn.Func.Nname.Func.Inl)
-	fn.Func.Nname.Func.Inldcl = inlcopylist(fn.Func.Nname.Name.Defn.Func.Dcl)
+	inldcl := inlcopyslice(fn.Func.Nname.Name.Defn.Func.Dcl)
+	if len(inldcl) > 0 {
+		fn.Func.Nname.Func.Inldcl = &inldcl
+	}
 	fn.Func.Nname.Func.InlCost = int32(maxBudget - budget)
 
 	// hack, TODO, check for better way to link method nodes back to the thing with the ->inl
@@ -275,6 +278,18 @@ func inlcopy(n *Node) *Node {
 	return m
 }
 
+// Inlcopyslice is like inlcopylist, but for a slice.
+func inlcopyslice(ll []*Node) []*Node {
+	r := make([]*Node, 0, len(ll))
+	for _, ln := range ll {
+		c := inlcopy(ln)
+		if c != nil {
+			r = append(r, c)
+		}
+	}
+	return r
+}
+
 // Inlcalls/nodelist/node walks fn's statements and expressions and substitutes any
 // calls made to inlineable functions.  This is the external entry point.
 func inlcalls(fn *Node) {
@@ -556,10 +571,14 @@ func mkinlcall1(np **Node, fn *Node, isddd bool) {
 
 	//dumplist("ninit pre", ninit);
 
-	var dcl *NodeList
-	if fn.Name.Defn != nil { // local function
-		dcl = fn.Func.Inldcl // imported function
+	var dcl []*Node
+	if fn.Name.Defn != nil {
+		// local function
+		if fn.Func.Inldcl != nil {
+			dcl = *fn.Func.Inldcl
+		}
 	} else {
+		// imported function
 		dcl = fn.Func.Dcl
 	}
 
@@ -567,18 +586,18 @@ func mkinlcall1(np **Node, fn *Node, isddd bool) {
 	i := 0
 
 	// Make temp names to use instead of the originals
-	for ll := dcl; ll != nil; ll = ll.Next {
-		if ll.N.Class == PPARAMOUT { // return values handled below.
+	for _, ln := range dcl {
+		if ln.Class == PPARAMOUT { // return values handled below.
 			continue
 		}
-		if ll.N.Op == ONAME {
-			ll.N.Name.Inlvar = inlvar(ll.N)
+		if ln.Op == ONAME {
+			ln.Name.Inlvar = inlvar(ln)
 
 			// Typecheck because inlvar is not necessarily a function parameter.
-			typecheck(&ll.N.Name.Inlvar, Erv)
+			typecheck(&ln.Name.Inlvar, Erv)
 
-			if ll.N.Class&^PHEAP != PAUTO {
-				ninit = list(ninit, Nod(ODCL, ll.N.Name.Inlvar, nil)) // otherwise gen won't emit the allocations for heapallocs
+			if ln.Class&^PHEAP != PAUTO {
+				ninit = list(ninit, Nod(ODCL, ln.Name.Inlvar, nil)) // otherwise gen won't emit the allocations for heapallocs
 			}
 		}
 	}
@@ -852,7 +871,7 @@ func inlvar(var_ *Node) *Node {
 		addrescapes(n)
 	}
 
-	Curfn.Func.Dcl = list(Curfn.Func.Dcl, n)
+	Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
 	return n
 }
 
@@ -863,7 +882,7 @@ func retvar(t *Type, i int) *Node {
 	n.Class = PAUTO
 	n.Used = true
 	n.Name.Curfn = Curfn // the calling function, not the called one
-	Curfn.Func.Dcl = list(Curfn.Func.Dcl, n)
+	Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
 	return n
 }
 
@@ -875,7 +894,7 @@ func argvar(t *Type, i int) *Node {
 	n.Class = PAUTO
 	n.Used = true
 	n.Name.Curfn = Curfn // the calling function, not the called one
-	Curfn.Func.Dcl = list(Curfn.Func.Dcl, n)
+	Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
 	return n
 }
 

src/cmd/compile/internal/gc/mparith2.go

@@ -217,7 +217,11 @@ func mplshfixfix(a, b *Mpint) {
 
 	s := Mpgetfix(b)
 	if s < 0 || s >= Mpprec {
-		Yyerror("stupid shift: %d", s)
+		msg := "shift count too large"
+		if s < 0 {
+			msg = "invalid negative shift count"
+		}
+		Yyerror("%s: %d", msg, s)
 		Mpmovecfix(a, 0)
 		return
 	}
@@ -236,7 +240,7 @@ func mprshfixfix(a, b *Mpint) {
 
 	s := Mpgetfix(b)
 	if s < 0 {
-		Yyerror("stupid shift: %d", s)
+		Yyerror("invalid negative shift count: %d", s)
 		if a.Val.Sign() < 0 {
 			Mpmovecfix(a, -1)
 		} else {

src/cmd/compile/internal/gc/mparith3.go

@@ -11,7 +11,7 @@ import (
 	"math"
 )
 
-/// implements float arihmetic
+// implements float arithmetic
 
 func newMpflt() *Mpflt {
 	var a Mpflt

src/cmd/compile/internal/gc/order.go

@@ -387,7 +387,7 @@ func ordercall(n *Node, order *Order) {
 
 // Ordermapassign appends n to order->out, introducing temporaries
 // to make sure that all map assignments have the form m[k] = x,
-// where x is adressable.
+// where x is addressable.
 // (Orderexpr has already been called on n, so we know k is addressable.)
 //
 // If n is m[k] = x where x is not addressable, the rewrite is:
@@ -1138,7 +1138,7 @@ func orderexpr(np **Node, order *Order, lhs *Node) {
 		}
 
 	case OCLOSURE:
-		if n.Noescape && n.Func.Cvars != nil {
+		if n.Noescape && len(n.Func.Cvars.Slice()) > 0 {
 			prealloc[n] = ordertemp(Types[TUINT8], order, false) // walk will fill in correct type
 		}
 

src/cmd/compile/internal/gc/parser.go

@@ -102,6 +102,8 @@ func (p *parser) syntax_error(msg string) {
 		}
 	case LASOP:
 		tok = goopnames[p.op] + "="
+	case LINCOP:
+		tok = goopnames[p.op] + goopnames[p.op]
 	default:
 		tok = tokstring(p.tok)
 	}
@@ -110,11 +112,11 @@ func (p *parser) syntax_error(msg string) {
 }
 
 // Like syntax_error, but reports error at given line rather than current lexer line.
-func (p *parser) syntax_error_at(lineno int32, msg string) {
-	defer func(lineno int32) {
-		lexlineno = lineno
-	}(lexlineno)
-	lexlineno = lineno
+func (p *parser) syntax_error_at(lno int32, msg string) {
+	defer func(lno int32) {
+		lineno = lno
+	}(lineno)
+	lineno = lno
 	p.syntax_error(msg)
 }
 
@@ -219,12 +221,11 @@ var tokstrings = map[int32]string{
 	LANDAND:    "&&",
 	LANDNOT:    "&^",
 	LCOMM:      "<-",
-	LDEC:       "--",
 	LEQ:        "==",
 	LGE:        ">=",
 	LGT:        ">",
 	LIGNORE:    "LIGNORE", // we should never see this one
-	LINC:       "++",
+	LINCOP:     "opop",
 	LLE:        "<=",
 	LLSH:       "<<",
 	LLT:        "<",
@@ -280,13 +281,11 @@ func (p *parser) package_() {
 		defer p.trace("package_")()
 	}
 
-	if p.got(LPACKAGE) {
-		mkpackage(p.sym().Name)
-	} else {
-		prevlineno = lineno // see issue #13267
+	if !p.got(LPACKAGE) {
 		p.syntax_error("package statement must be first")
 		errorexit()
 	}
+	mkpackage(p.sym().Name)
 }
 
 // ImportDecl = "import" ( ImportSpec | "(" { ImportSpec ";" } ")" ) .
@@ -335,20 +334,22 @@ func (p *parser) importdcl() {
 	}
 
 	line := int32(parserline())
-	path := p.val
-	p.next()
 
-	importfile(&path, p.indent)
-	if importpkg == nil {
+	// We need to clear importpkg before calling p.next(),
+	// otherwise it will affect lexlineno.
+	// TODO(mdempsky): Fix this clumsy API.
+	importfile(&p.val, p.indent)
+	ipkg := importpkg
+	importpkg = nil
+
+	p.next()
+	if ipkg == nil {
 		if nerrors == 0 {
 			Fatalf("phase error in import")
 		}
 		return
 	}
 
-	ipkg := importpkg
-	importpkg = nil
-
 	ipkg.Direct = true
 
 	if my == nil {
@@ -562,22 +563,13 @@ func (p *parser) simple_stmt(labelOk, rangeOk bool) *Node {
 			stmt.Etype = EType(op) // rathole to pass opcode
 			return stmt
 
-		case LINC:
-			// expr LINC
+		case LINCOP:
+			// expr LINCOP
 			p.next()
 
 			stmt := Nod(OASOP, lhs, Nodintconst(1))
 			stmt.Implicit = true
-			stmt.Etype = EType(OADD)
-			return stmt
-
-		case LDEC:
-			// expr LDEC
-			p.next()
-
-			stmt := Nod(OASOP, lhs, Nodintconst(1))
-			stmt.Implicit = true
-			stmt.Etype = EType(OSUB)
+			stmt.Etype = EType(p.op)
 			return stmt
 
 		case ':':
@@ -689,7 +681,7 @@ func (p *parser) labeled_stmt(label *Node) *Node {
 		ls = p.stmt()
 		if ls == missing_stmt {
 			// report error at line of ':' token
-			p.syntax_error_at(prevlineno, "missing statement after label")
+			p.syntax_error_at(label.Lineno, "missing statement after label")
 			// we are already at the end of the labeled statement - no need to advance
 			return missing_stmt
 		}
@@ -1104,55 +1096,18 @@ func (p *parser) select_stmt() *Node {
 	return hdr
 }
 
-// TODO(gri) should have lexer return this info - no need for separate lookup
-// (issue 13244)
-var prectab = map[int32]struct {
-	prec int // > 0 (0 indicates not found)
-	op   Op
-}{
-	// not an expression anymore, but left in so we can give a good error
-	// message when used in expression context
-	LCOMM: {1, OSEND},
-
-	LOROR: {2, OOROR},
-
-	LANDAND: {3, OANDAND},
-
-	LEQ: {4, OEQ},
-	LNE: {4, ONE},
-	LLE: {4, OLE},
-	LGE: {4, OGE},
-	LLT: {4, OLT},
-	LGT: {4, OGT},
-
-	'+': {5, OADD},
-	'-': {5, OSUB},
-	'|': {5, OOR},
-	'^': {5, OXOR},
-
-	'*':     {6, OMUL},
-	'/':     {6, ODIV},
-	'%':     {6, OMOD},
-	'&':     {6, OAND},
-	LLSH:    {6, OLSH},
-	LRSH:    {6, ORSH},
-	LANDNOT: {6, OANDNOT},
-}
-
 // Expression = UnaryExpr | Expression binary_op Expression .
-func (p *parser) bexpr(prec int) *Node {
+func (p *parser) bexpr(prec OpPrec) *Node {
 	// don't trace bexpr - only leads to overly nested trace output
 
+	// prec is precedence of the prior/enclosing binary operator (if any),
+	// so we only want to parse tokens of greater precedence.
+
 	x := p.uexpr()
-	t := prectab[p.tok]
-	for tprec := t.prec; tprec >= prec; tprec-- {
-		for tprec == prec {
+	for p.prec > prec {
+		op, prec1 := p.op, p.prec
 		p.next()
-			y := p.bexpr(t.prec + 1)
-			x = Nod(t.op, x, y)
-			t = prectab[p.tok]
-			tprec = t.prec
-		}
+		x = Nod(op, x, p.bexpr(prec1))
 	}
 	return x
 }
@@ -1162,7 +1117,7 @@ func (p *parser) expr() *Node {
 		defer p.trace("expr")()
 	}
 
-	return p.bexpr(1)
+	return p.bexpr(0)
 }
 
 func unparen(x *Node) *Node {
@@ -1611,13 +1566,15 @@ func (p *parser) new_name(sym *Sym) *Node {
 	return nil
 }
 
-func (p *parser) dcl_name(sym *Sym) *Node {
+func (p *parser) dcl_name() *Node {
 	if trace && Debug['x'] != 0 {
 		defer p.trace("dcl_name")()
 	}
 
+	symlineno := lineno
+	sym := p.sym()
 	if sym == nil {
-		yyerrorl(int(prevlineno), "invalid declaration")
+		yyerrorl(int(symlineno), "invalid declaration")
 		return nil
 	}
 	return dclname(sym)
@@ -1894,25 +1851,21 @@ func (p *parser) xfndcl() *Node {
 	}
 
 	p.want(LFUNC)
-	f := p.fndcl()
+	f := p.fndcl(p.pragma&Nointerface != 0)
 	body := p.fnbody()
 
 	if f == nil {
 		return nil
 	}
-	if noescape && body != nil {
-		Yyerror("can only use //go:noescape with external func implementations")
-	}
 
 	f.Nbody = body
+	f.Noescape = p.pragma&Noescape != 0
+	if f.Noescape && body != nil {
+		Yyerror("can only use //go:noescape with external func implementations")
+	}
+	f.Func.Pragma = p.pragma
 	f.Func.Endlineno = lineno
-	f.Noescape = noescape
-	f.Func.Norace = norace
-	f.Func.Nosplit = nosplit
-	f.Func.Noinline = noinline
-	f.Func.Nowritebarrier = nowritebarrier
-	f.Func.Nowritebarrierrec = nowritebarrierrec
-	f.Func.Systemstack = systemstack
+
 	funcbody(f)
 
 	return f
@@ -1923,7 +1876,7 @@ func (p *parser) xfndcl() *Node {
 // Function     = Signature FunctionBody .
 // MethodDecl   = "func" Receiver MethodName ( Function | Signature ) .
 // Receiver     = Parameters .
-func (p *parser) fndcl() *Node {
+func (p *parser) fndcl(nointerface bool) *Node {
 	if trace && Debug['x'] != 0 {
 		defer p.trace("fndcl")()
 	}
@@ -2059,8 +2012,7 @@ func (p *parser) hidden_fndcl() *Node {
 		ss.Type = functype(s2.N, s6, s8)
 
 		checkwidth(ss.Type)
-		addmethod(s4, ss.Type, false, nointerface)
-		nointerface = false
+		addmethod(s4, ss.Type, false, false)
 		funchdr(ss)
 
 		// inl.C's inlnode in on a dotmeth node expects to find the inlineable body as
@@ -2141,18 +2093,10 @@ loop:
 			testdclstack()
 		}
 
-		noescape = false
-		noinline = false
-		nointerface = false
-		norace = false
-		nosplit = false
-		nowritebarrier = false
-		nowritebarrierrec = false
-		systemstack = false
+		// Reset p.pragma BEFORE advancing to the next token (consuming ';')
+		// since comments before may set pragmas for the next function decl.
+		p.pragma = 0
 
-		// Consume ';' AFTER resetting the above flags since
-		// it may read the subsequent comment line which may
-		// set the flags for the next function declaration.
 		if p.tok != EOF && !p.got(';') {
 			p.syntax_error("after top level declaration")
 			p.advance(LVAR, LCONST, LTYPE, LFUNC)
@@ -2567,15 +2511,15 @@ func (p *parser) stmt() *Node {
 		stmt := Nod(ORETURN, nil, nil)
 		stmt.List = results
 		if stmt.List == nil && Curfn != nil {
-			for l := Curfn.Func.Dcl; l != nil; l = l.Next {
-				if l.N.Class == PPARAM {
+			for _, ln := range Curfn.Func.Dcl {
+				if ln.Class == PPARAM {
 					continue
 				}
-				if l.N.Class != PPARAMOUT {
+				if ln.Class != PPARAMOUT {
 					break
 				}
-				if l.N.Sym.Def != l.N {
-					Yyerror("%s is shadowed during return", l.N.Sym.Name)
+				if ln.Sym.Def != ln {
+					Yyerror("%s is shadowed during return", ln.Sym.Name)
 				}
 			}
 		}
@@ -2639,9 +2583,9 @@ func (p *parser) dcl_name_list() *NodeList {
 		defer p.trace("dcl_name_list")()
 	}
 
-	l := list1(p.dcl_name(p.sym()))
+	l := list1(p.dcl_name())
 	for p.got(',') {
-		l = list(l, p.dcl_name(p.sym()))
+		l = list(l, p.dcl_name())
 	}
 	return l
 }

src/cmd/compile/internal/gc/pgen.go

@@ -9,6 +9,7 @@ import (
 	"cmd/internal/obj"
 	"crypto/md5"
 	"fmt"
+	"sort"
 	"strings"
 )
 
@@ -218,6 +219,13 @@ func cmpstackvarlt(a, b *Node) bool {
 	return a.Sym.Name < b.Sym.Name
 }
 
+// byStackvar implements sort.Interface for []*Node using cmpstackvarlt.
+type byStackVar []*Node
+
+func (s byStackVar) Len() int           { return len(s) }
+func (s byStackVar) Less(i, j int) bool { return cmpstackvarlt(s[i], s[j]) }
+func (s byStackVar) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
 // stkdelta records the stack offset delta for a node
 // during the compaction of the stack frame to remove
 // unused stack slots.
@@ -228,25 +236,23 @@ func allocauto(ptxt *obj.Prog) {
 	Stksize = 0
 	stkptrsize = 0
 
-	if Curfn.Func.Dcl == nil {
+	if len(Curfn.Func.Dcl) == 0 {
 		return
 	}
 
 	// Mark the PAUTO's unused.
-	for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-		if ll.N.Class == PAUTO {
-			ll.N.Used = false
+	for _, ln := range Curfn.Func.Dcl {
+		if ln.Class == PAUTO {
+			ln.Used = false
 		}
 	}
 
 	markautoused(ptxt)
 
-	listsort(&Curfn.Func.Dcl, cmpstackvarlt)
+	sort.Sort(byStackVar(Curfn.Func.Dcl))
 
 	// Unused autos are at the end, chop 'em off.
-	ll := Curfn.Func.Dcl
-
-	n := ll.N
+	n := Curfn.Func.Dcl[0]
 	if n.Class == PAUTO && n.Op == ONAME && !n.Used {
 		// No locals used at all
 		Curfn.Func.Dcl = nil
@@ -255,19 +261,17 @@ func allocauto(ptxt *obj.Prog) {
 		return
 	}
 
-	for ll := Curfn.Func.Dcl; ll.Next != nil; ll = ll.Next {
-		n = ll.Next.N
+	for i := 1; i < len(Curfn.Func.Dcl); i++ {
+		n = Curfn.Func.Dcl[i]
 		if n.Class == PAUTO && n.Op == ONAME && !n.Used {
-			ll.Next = nil
-			Curfn.Func.Dcl.End = ll
+			Curfn.Func.Dcl = Curfn.Func.Dcl[:i]
 			break
 		}
 	}
 
 	// Reassign stack offsets of the locals that are still there.
 	var w int64
-	for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-		n = ll.N
+	for _, n := range Curfn.Func.Dcl {
 		if n.Class != PAUTO || n.Op != ONAME {
 			continue
 		}
@@ -299,12 +303,12 @@ func allocauto(ptxt *obj.Prog) {
 	fixautoused(ptxt)
 
 	// The debug information needs accurate offsets on the symbols.
-	for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-		if ll.N.Class != PAUTO || ll.N.Op != ONAME {
+	for _, ln := range Curfn.Func.Dcl {
+		if ln.Class != PAUTO || ln.Op != ONAME {
 			continue
 		}
-		ll.N.Xoffset += stkdelta[ll.N]
-		delete(stkdelta, ll.N)
+		ln.Xoffset += stkdelta[ln]
+		delete(stkdelta, ln)
 	}
 }
 
@@ -442,10 +446,10 @@ func compile(fn *Node) {
 	if fn.Func.Needctxt {
 		ptxt.From3.Offset |= obj.NEEDCTXT
 	}
-	if fn.Func.Nosplit {
+	if fn.Func.Pragma&Nosplit != 0 {
 		ptxt.From3.Offset |= obj.NOSPLIT
 	}
-	if fn.Func.Systemstack {
+	if fn.Func.Pragma&Systemstack != 0 {
 		ptxt.From.Sym.Cfunc = 1
 	}
 
@@ -467,16 +471,15 @@ func compile(fn *Node) {
 		gtrack(tracksym(t))
 	}
 
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range fn.Func.Dcl {
 		if n.Op != ONAME { // might be OTYPE or OLITERAL
 			continue
 		}
 		switch n.Class {
 		case PAUTO, PPARAM, PPARAMOUT:
-			Nodconst(&nod1, Types[TUINTPTR], l.N.Type.Width)
-			p = Thearch.Gins(obj.ATYPE, l.N, &nod1)
-			p.From.Gotype = Linksym(ngotype(l.N))
+			Nodconst(&nod1, Types[TUINTPTR], n.Type.Width)
+			p = Thearch.Gins(obj.ATYPE, n, &nod1)
+			p.From.Gotype = Linksym(ngotype(n))
 		}
 	}
 
@@ -488,7 +491,7 @@ func compile(fn *Node) {
 		ssafn.Free()
 		return
 	}
-	Genlist(Curfn.Func.Enter)
+	Genslice(Curfn.Func.Enter.Slice())
 	Genlist(Curfn.Nbody)
 	gclean()
 	checklabels()

src/cmd/compile/internal/gc/plive.go

@@ -122,7 +122,7 @@ func addedge(from *BasicBlock, to *BasicBlock) {
 }
 
 // Inserts prev before curr in the instruction
-// stream.  Any control flow, such as branches or fall throughs, that target the
+// stream.  Any control flow, such as branches or fall-throughs, that target the
 // existing instruction are adjusted to target the new instruction.
 func splicebefore(lv *Liveness, bb *BasicBlock, prev *obj.Prog, curr *obj.Prog) {
 	// There may be other instructions pointing at curr,
@@ -198,8 +198,8 @@ func blockany(bb *BasicBlock, f func(*obj.Prog) bool) bool {
 // variables.
 func getvariables(fn *Node) []*Node {
 	result := make([]*Node, 0, 0)
-	for ll := fn.Func.Dcl; ll != nil; ll = ll.Next {
-		if ll.N.Op == ONAME {
+	for _, ln := range fn.Func.Dcl {
+		if ln.Op == ONAME {
 			// In order for GODEBUG=gcdead=1 to work, each bitmap needs
 			// to contain information about all variables covered by the bitmap.
 			// For local variables, the bitmap only covers the stkptrsize
@@ -219,24 +219,24 @@ func getvariables(fn *Node) []*Node {
 			// Later, when we want to find the index of a node in the variables list,
 			// we will check that n->curfn == curfn and n->opt > 0. Then n->opt - 1
 			// is the index in the variables list.
-			ll.N.SetOpt(nil)
+			ln.SetOpt(nil)
 
 			// The compiler doesn't emit initializations for zero-width parameters or results.
-			if ll.N.Type.Width == 0 {
+			if ln.Type.Width == 0 {
 				continue
 			}
 
-			ll.N.Name.Curfn = Curfn
-			switch ll.N.Class {
+			ln.Name.Curfn = Curfn
+			switch ln.Class {
 			case PAUTO:
-				if haspointers(ll.N.Type) {
-					ll.N.SetOpt(int32(len(result)))
-					result = append(result, ll.N)
+				if haspointers(ln.Type) {
+					ln.SetOpt(int32(len(result)))
+					result = append(result, ln)
 				}
 
 			case PPARAM, PPARAMOUT:
-				ll.N.SetOpt(int32(len(result)))
-				result = append(result, ll.N)
+				ln.SetOpt(int32(len(result)))
+				result = append(result, ln)
 			}
 		}
 	}
@@ -798,8 +798,8 @@ func livenessprintcfg(lv *Liveness) {
 }
 
 func checkauto(fn *Node, p *obj.Prog, n *Node) {
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op == ONAME && l.N.Class == PAUTO && l.N == n {
+	for _, ln := range fn.Func.Dcl {
+		if ln.Op == ONAME && ln.Class == PAUTO && ln == n {
 			return
 		}
 	}
@@ -810,8 +810,8 @@ func checkauto(fn *Node, p *obj.Prog, n *Node) {
 	}
 
 	fmt.Printf("checkauto %v: %v (%p; class=%d) not found in %p %v\n", funcSym(Curfn), n, n, n.Class, p, p)
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		fmt.Printf("\t%v (%p; class=%d)\n", l.N, l.N, l.N.Class)
+	for _, ln := range fn.Func.Dcl {
+		fmt.Printf("\t%v (%p; class=%d)\n", ln, ln, ln.Class)
 	}
 	Yyerror("checkauto: invariant lost")
 }
@@ -820,10 +820,8 @@ func checkparam(fn *Node, p *obj.Prog, n *Node) {
 	if isfunny(n) {
 		return
 	}
-	var a *Node
 	var class Class
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		a = l.N
+	for _, a := range fn.Func.Dcl {
 		class = a.Class &^ PHEAP
 		if a.Op == ONAME && (class == PPARAM || class == PPARAMOUT) && a == n {
 			return
@@ -831,8 +829,8 @@ func checkparam(fn *Node, p *obj.Prog, n *Node) {
 	}
 
 	fmt.Printf("checkparam %v: %v (%p; class=%d) not found in %v\n", Curfn, n, n, n.Class, p)
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		fmt.Printf("\t%v (%p; class=%d)\n", l.N, l.N, l.N.Class)
+	for _, ln := range fn.Func.Dcl {
+		fmt.Printf("\t%v (%p; class=%d)\n", ln, ln, ln.Class)
 	}
 	Yyerror("checkparam: invariant lost")
 }
@@ -1815,9 +1813,9 @@ func liveness(fn *Node, firstp *obj.Prog, argssym *Sym, livesym *Sym) {
 	onebitwritesymbol(lv.argslivepointers, argssym)
 
 	// Free everything.
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		if l.N != nil {
-			l.N.SetOpt(nil)
+	for _, ln := range fn.Func.Dcl {
+		if ln != nil {
+			ln.SetOpt(nil)
 		}
 	}
 	freeliveness(lv)

src/cmd/compile/internal/gc/popt.go

@@ -138,15 +138,16 @@ func fixjmp(firstp *obj.Prog) {
 			fmt.Printf("%v\n", p)
 		}
 		if p.As != obj.ACALL && p.To.Type == obj.TYPE_BRANCH && p.To.Val.(*obj.Prog) != nil && p.To.Val.(*obj.Prog).As == obj.AJMP {
+			if Debug['N'] == 0 {
 				p.To.Val = chasejmp(p.To.Val.(*obj.Prog), &jmploop)
 				if Debug['R'] != 0 && Debug['v'] != 0 {
 					fmt.Printf("->%v\n", p)
 				}
 			}
+		}
 
 		p.Opt = dead
 	}
-
 	if Debug['R'] != 0 && Debug['v'] != 0 {
 		fmt.Printf("\n")
 	}
@@ -186,7 +187,7 @@ func fixjmp(firstp *obj.Prog) {
 
 	// pass 4: elide JMP to next instruction.
 	// only safe if there are no jumps to JMPs anymore.
-	if jmploop == 0 {
+	if jmploop == 0 && Debug['N'] == 0 {
 		var last *obj.Prog
 		for p := firstp; p != nil; p = p.Link {
 			if p.As == obj.AJMP && p.To.Type == obj.TYPE_BRANCH && p.To.Val == p.Link {
@@ -217,22 +218,22 @@ func fixjmp(firstp *obj.Prog) {
 // Control flow analysis. The Flow structures hold predecessor and successor
 // information as well as basic loop analysis.
 //
-//	graph = flowstart(firstp, 0);
+//	graph = Flowstart(firstp, nil)
 //	... use flow graph ...
-//	flowend(graph); // free graph
+//	Flowend(graph) // free graph
 //
 // Typical uses of the flow graph are to iterate over all the flow-relevant instructions:
 //
-//	for(f = graph->start; f != nil; f = f->link)
+//	for f := graph.Start; f != nil; f = f.Link {}
 //
 // or, given an instruction f, to iterate over all the predecessors, which is
-// f->p1 and this list:
+// f.P1 and this list:
 //
-//	for(f2 = f->p2; f2 != nil; f2 = f2->p2link)
+//	for f2 := f.P2; f2 != nil; f2 = f2.P2link {}
 //
-// The size argument to flowstart specifies an amount of zeroed memory
-// to allocate in every f->data field, for use by the client.
-// If size == 0, f->data will be nil.
+// The second argument (newData) to Flowstart specifies a func to create object
+// for every f.Data field, for use by the client.
+// If newData is nil, f.Data will be nil.
 
 var flowmark int
 
@@ -471,8 +472,8 @@ func flowrpo(g *Graph) {
 		me = r1.Rpo
 		d = -1
 
-		// rpo2r[r->rpo] == r protects against considering dead code,
-		// which has r->rpo == 0.
+		// rpo2r[r.Rpo] == r protects against considering dead code,
+		// which has r.Rpo == 0.
 		if r1.P1 != nil && rpo2r[r1.P1.Rpo] == r1.P1 && r1.P1.Rpo < me {
 			d = r1.P1.Rpo
 		}
@@ -588,8 +589,8 @@ func mergetemp(firstp *obj.Prog) {
 
 	// Build list of all mergeable variables.
 	var vars []*TempVar
-	for l := Curfn.Func.Dcl; l != nil; l = l.Next {
-		if n := l.N; canmerge(n) {
+	for _, n := range Curfn.Func.Dcl {
+		if canmerge(n) {
 			v := &TempVar{}
 			vars = append(vars, v)
 			n.SetOpt(v)
@@ -684,7 +685,7 @@ func mergetemp(firstp *obj.Prog) {
 
 	// Traverse live range of each variable to set start, end.
 	// Each flood uses a new value of gen so that we don't have
-	// to clear all the r->active words after each variable.
+	// to clear all the r.Active words after each variable.
 	gen := uint32(0)
 
 	for _, v := range vars {
@@ -818,22 +819,15 @@ func mergetemp(firstp *obj.Prog) {
 	}
 
 	// Delete merged nodes from declaration list.
-	for lp := &Curfn.Func.Dcl; ; {
-		l := *lp
-		if l == nil {
-			break
-		}
-
-		Curfn.Func.Dcl.End = l
-		n := l.N
+	dcl := make([]*Node, 0, len(Curfn.Func.Dcl)-nkill)
+	for _, n := range Curfn.Func.Dcl {
 		v, _ := n.Opt().(*TempVar)
 		if v != nil && (v.merge != nil || v.removed) {
-			*lp = l.Next
 			continue
 		}
-
-		lp = &l.Next
+		dcl = append(dcl, n)
 	}
+	Curfn.Func.Dcl = dcl
 
 	// Clear aux structures.
 	for _, v := range vars {
@@ -910,7 +904,7 @@ func varkillwalk(v *TempVar, f0 *Flow, gen uint32) {
 // from memory without being rechecked. Other variables need to be checked on
 // each load.
 
-var killed int // f->data is either nil or &killed
+var killed int // f.Data is either nil or &killed
 
 func nilopt(firstp *obj.Prog) {
 	g := Flowstart(firstp, nil)

src/cmd/compile/internal/gc/racewalk.go

@@ -50,7 +50,7 @@ func ispkgin(pkgs []string) bool {
 }
 
 func instrument(fn *Node) {
-	if ispkgin(omit_pkgs) || fn.Func.Norace {
+	if ispkgin(omit_pkgs) || fn.Func.Pragma&Norace != 0 {
 		return
 	}
 
@@ -58,7 +58,7 @@ func instrument(fn *Node) {
 		instrumentlist(fn.Nbody, nil)
 
 		// nothing interesting for race detector in fn->enter
-		instrumentlist(fn.Func.Exit, nil)
+		instrumentslice(fn.Func.Exit.Slice(), nil)
 	}
 
 	if flag_race != 0 {
@@ -71,18 +71,18 @@ func instrument(fn *Node) {
 		nodpc.Type = Types[TUINTPTR]
 		nodpc.Xoffset = int64(-Widthptr)
 		nd := mkcall("racefuncenter", nil, nil, nodpc)
-		fn.Func.Enter = concat(list1(nd), fn.Func.Enter)
+		fn.Func.Enter.Set(append([]*Node{nd}, fn.Func.Enter.Slice()...))
 		nd = mkcall("racefuncexit", nil, nil)
-		fn.Func.Exit = list(fn.Func.Exit, nd)
+		fn.Func.Exit.Append(nd)
 	}
 
 	if Debug['W'] != 0 {
 		s := fmt.Sprintf("after instrument %v", fn.Func.Nname.Sym)
 		dumplist(s, fn.Nbody)
 		s = fmt.Sprintf("enter %v", fn.Func.Nname.Sym)
-		dumplist(s, fn.Func.Enter)
+		dumpslice(s, fn.Func.Enter.Slice())
 		s = fmt.Sprintf("exit %v", fn.Func.Nname.Sym)
-		dumplist(s, fn.Func.Exit)
+		dumpslice(s, fn.Func.Exit.Slice())
 	}
 }
 
@@ -100,6 +100,18 @@ func instrumentlist(l *NodeList, init **NodeList) {
 	}
 }
 
+func instrumentslice(l []*Node, init **NodeList) {
+	for i := range l {
+		var instr *NodeList
+		instrumentnode(&l[i], &instr, 0, 0)
+		if init == nil {
+			l[i].Ninit = concat(l[i].Ninit, instr)
+		} else {
+			*init = concat(*init, instr)
+		}
+	}
+}
+
 // walkexpr and walkstmt combined
 // walks the tree and adds calls to the
 // instrumentation code to top-level (statement) nodes' init

src/cmd/compile/internal/gc/reflect.go

@@ -491,17 +491,11 @@ func dextratype(sym *Sym, off int, t *Type, ptroff int) int {
 
 	ot := off
 	s := sym
-	if t.Sym != nil {
-		ot = dgostringptr(s, ot, t.Sym.Name)
-		if t != Types[t.Etype] && t != errortype {
+	if t.Sym != nil && t != Types[t.Etype] && t != errortype {
 		ot = dgopkgpath(s, ot, t.Sym.Pkg)
 	} else {
 		ot = dgostringptr(s, ot, "")
 	}
-	} else {
-		ot = dgostringptr(s, ot, "")
-		ot = dgostringptr(s, ot, "")
-	}
 
 	// slice header
 	ot = dsymptr(s, ot, s, ot+Widthptr+2*Widthint)
@@ -700,12 +694,14 @@ func dcommontype(s *Sym, ot int, t *Type) int {
 		algsym = dalgsym(t)
 	}
 
-	var sptr *Sym
 	tptr := Ptrto(t)
 	if !Isptr[t.Etype] && (t.Sym != nil || methods(tptr) != nil) {
-		sptr = dtypesym(tptr)
-	} else {
-		sptr = weaktypesym(tptr)
+		sptr := dtypesym(tptr)
+		r := obj.Addrel(Linksym(s))
+		r.Off = 0
+		r.Siz = 0
+		r.Sym = sptr.Lsym
+		r.Type = obj.R_USETYPE
 	}
 
 	gcsym, useGCProg, ptrdata := dgcsym(t)
@@ -724,7 +720,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
 	//		gcdata        *byte
 	//		string        *string
 	//		*uncommonType
-	//		ptrToThis     *rtype
 	//	}
 	ot = duintptr(s, ot, uint64(t.Width))
 	ot = duintptr(s, ot, uint64(ptrdata))
@@ -763,12 +758,14 @@ func dcommontype(s *Sym, ot int, t *Type) int {
 	} else {
 		ot = dsymptr(s, ot, algsym, 0)
 	}
-	ot = dsymptr(s, ot, gcsym, 0)
+	ot = dsymptr(s, ot, gcsym, 0) // gcdata
 
 	p := Tconv(t, obj.FmtLeft|obj.FmtUnsigned)
 
-	//print("dcommontype: %s\n", p);
-	ot = dgostringptr(s, ot, p) // string
+	_, symdata := stringsym(p) // string
+	ot = dsymptr(s, ot, symdata, 0)
+	ot = duintxx(s, ot, uint64(len(p)), Widthint)
+	//fmt.Printf("dcommontype: %s\n", p)
 
 	// skip pointer to extraType,
 	// which follows the rest of this type structure.
@@ -776,7 +773,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
 	// otherwise linker will assume 0.
 	ot += Widthptr
 
-	ot = dsymptr(s, ot, sptr, 0) // ptrto type
 	return ot
 }
 
@@ -1006,7 +1002,7 @@ ok:
 	switch t.Etype {
 	default:
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 
 	case TARRAY:
 		if t.Bound >= 0 {
@@ -1018,7 +1014,7 @@ ok:
 			t2.Bound = -1 // slice
 			s2 := dtypesym(t2)
 			ot = dcommontype(s, ot, t)
-			xt = ot - 2*Widthptr
+			xt = ot - 1*Widthptr
 			ot = dsymptr(s, ot, s1, 0)
 			ot = dsymptr(s, ot, s2, 0)
 			ot = duintptr(s, ot, uint64(t.Bound))
@@ -1027,7 +1023,7 @@ ok:
 			s1 := dtypesym(t.Type)
 
 			ot = dcommontype(s, ot, t)
-			xt = ot - 2*Widthptr
+			xt = ot - 1*Widthptr
 			ot = dsymptr(s, ot, s1, 0)
 		}
 
@@ -1036,7 +1032,7 @@ ok:
 		s1 := dtypesym(t.Type)
 
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = dsymptr(s, ot, s1, 0)
 		ot = duintptr(s, ot, uint64(t.Chan))
 
@@ -1055,7 +1051,7 @@ ok:
 		}
 
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = duint8(s, ot, uint8(obj.Bool2int(isddd)))
 
 		// two slice headers: in and out.
@@ -1093,7 +1089,7 @@ ok:
 		// ../../../../runtime/type.go:/interfaceType
 		ot = dcommontype(s, ot, t)
 
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = dsymptr(s, ot, s, ot+Widthptr+2*Widthint)
 		ot = duintxx(s, ot, uint64(n), Widthint)
 		ot = duintxx(s, ot, uint64(n), Widthint)
@@ -1113,7 +1109,7 @@ ok:
 		s3 := dtypesym(mapbucket(t))
 		s4 := dtypesym(hmap(t))
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = dsymptr(s, ot, s1, 0)
 		ot = dsymptr(s, ot, s2, 0)
 		ot = dsymptr(s, ot, s3, 0)
@@ -1150,7 +1146,7 @@ ok:
 		s1 := dtypesym(t.Type)
 
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = dsymptr(s, ot, s1, 0)
 
 	// ../../../../runtime/type.go:/structType
@@ -1164,7 +1160,7 @@ ok:
 		}
 
 		ot = dcommontype(s, ot, t)
-		xt = ot - 2*Widthptr
+		xt = ot - 1*Widthptr
 		ot = dsymptr(s, ot, s, ot+Widthptr+2*Widthint)
 		ot = duintxx(s, ot, uint64(n), Widthint)
 		ot = duintxx(s, ot, uint64(n), Widthint)
@@ -1203,21 +1199,7 @@ ok:
 	// we want be able to find.
 	if t.Sym == nil {
 		switch t.Etype {
-		case TPTR32, TPTR64:
-			// The ptrto field of the type data cannot be relied on when
-			// dynamic linking: a type T may be defined in a module that makes
-			// no use of pointers to that type, but another module can contain
-			// a package that imports the first one and does use *T pointers.
-			// The second module will end up defining type data for *T and a
-			// type.*T symbol pointing at it. It's important that calling
-			// .PtrTo() on the reflect.Type for T returns this type data and
-			// not some synthesized object, so we need reflect to be able to
-			// find it!
-			if !Ctxt.Flag_dynlink {
-				break
-			}
-			fallthrough
-		case TARRAY, TCHAN, TFUNC, TMAP:
+		case TPTR32, TPTR64, TARRAY, TCHAN, TFUNC, TMAP:
 			slink := typelinksym(t)
 			dsymptr(slink, 0, s, 0)
 			ggloblsym(slink, int32(Widthptr), int16(dupok|obj.RODATA))
@@ -1377,7 +1359,7 @@ func dalgsym(t *Type) *Sym {
 // be multiples of four words. On 32-bit systems that's 16 bytes, and
 // all size classes >= 16 bytes are 16-byte aligned, so no real constraint.
 // On 64-bit systems, that's 32 bytes, and 32-byte alignment is guaranteed
-// for size classes >= 256 bytes. On a 64-bit sytem, 256 bytes allocated
+// for size classes >= 256 bytes. On a 64-bit system, 256 bytes allocated
 // is 32 pointers, the bits for which fit in 4 bytes. So maxPtrmaskBytes
 // must be >= 4.
 //

src/cmd/compile/internal/gc/sinit.go

@@ -475,7 +475,7 @@ func staticassign(l *Node, r *Node, out **NodeList) bool {
 		break
 
 	case OCLOSURE:
-		if r.Func.Cvars == nil {
+		if len(r.Func.Cvars.Slice()) == 0 {
 			// Closures with no captured variables are globals,
 			// so the assignment can be done at link time.
 			n := *l

src/cmd/compile/internal/gc/ssa.go

@@ -84,9 +84,9 @@ func buildssa(fn *Node) *ssa.Func {
 	printssa := strings.HasSuffix(name, "_ssa") || strings.Contains(name, "_ssa.") || name == os.Getenv("GOSSAFUNC")
 	if printssa {
 		fmt.Println("generating SSA for", name)
-		dumplist("buildssa-enter", fn.Func.Enter)
+		dumpslice("buildssa-enter", fn.Func.Enter.Slice())
 		dumplist("buildssa-body", fn.Nbody)
-		dumplist("buildssa-exit", fn.Func.Exit)
+		dumpslice("buildssa-exit", fn.Func.Exit.Slice())
 	}
 
 	var s state
@@ -132,8 +132,7 @@ func buildssa(fn *Node) *ssa.Func {
 
 	// Generate addresses of local declarations
 	s.decladdrs = map[*Node]*ssa.Value{}
-	for d := fn.Func.Dcl; d != nil; d = d.Next {
-		n := d.N
+	for _, n := range fn.Func.Dcl {
 		switch n.Class {
 		case PPARAM:
 			aux := s.lookupSymbol(n, &ssa.ArgSymbol{Typ: n.Type, Node: n})
@@ -159,12 +158,12 @@ func buildssa(fn *Node) *ssa.Func {
 	}
 
 	// Convert the AST-based IR to the SSA-based IR
-	s.stmtList(fn.Func.Enter)
+	s.stmts(fn.Func.Enter)
 	s.stmtList(fn.Nbody)
 
 	// fallthrough to exit
 	if s.curBlock != nil {
-		s.stmtList(s.exitCode)
+		s.stmts(s.exitCode)
 		m := s.mem()
 		b := s.endBlock()
 		b.Kind = ssa.BlockRet
@@ -201,7 +200,7 @@ func buildssa(fn *Node) *ssa.Func {
 	s.linkForwardReferences()
 
 	// Don't carry reference this around longer than necessary
-	s.exitCode = nil
+	s.exitCode = Nodes{}
 
 	// Main call to ssa package to compile function
 	ssa.Compile(s.f)
@@ -224,7 +223,7 @@ type state struct {
 	fwdGotos []*Node
 	// Code that must precede any return
 	// (e.g., copying value of heap-escaped paramout back to true paramout)
-	exitCode *NodeList
+	exitCode Nodes
 
 	// unlabeled break and continue statement tracking
 	breakTo    *ssa.Block // current target for plain break statement
@@ -479,6 +478,12 @@ func (s *state) constInt(t ssa.Type, c int64) *ssa.Value {
 	return s.constInt32(t, int32(c))
 }
 
+func (s *state) stmts(a Nodes) {
+	for _, x := range a.Slice() {
+		s.stmt(x)
+	}
+}
+
 // ssaStmtList converts the statement n to SSA and adds it to s.
 func (s *state) stmtList(l *NodeList) {
 	for ; l != nil; l = l.Next {
@@ -697,14 +702,14 @@ func (s *state) stmt(n *Node) {
 
 	case ORETURN:
 		s.stmtList(n.List)
-		s.stmtList(s.exitCode)
+		s.stmts(s.exitCode)
 		m := s.mem()
 		b := s.endBlock()
 		b.Kind = ssa.BlockRet
 		b.Control = m
 	case ORETJMP:
 		s.stmtList(n.List)
-		s.stmtList(s.exitCode)
+		s.stmts(s.exitCode)
 		m := s.mem()
 		b := s.endBlock()
 		b.Kind = ssa.BlockRetJmp

src/cmd/compile/internal/gc/subr.go

@@ -19,7 +19,6 @@ import (
 
 type Error struct {
 	lineno int
-	seq    int
 	msg    string
 }
 
@@ -49,35 +48,24 @@ func adderrorname(n *Node) {
 
 func adderr(line int, format string, args ...interface{}) {
 	errors = append(errors, Error{
-		seq:    len(errors),
 		lineno: line,
 		msg:    fmt.Sprintf("%v: %s\n", Ctxt.Line(line), fmt.Sprintf(format, args...)),
 	})
 }
 
-// errcmp sorts errors by line, then seq, then message.
-type errcmp []Error
+// byLineno sorts errors by lineno.
+type byLineno []Error
 
-func (x errcmp) Len() int      { return len(x) }
-func (x errcmp) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x errcmp) Less(i, j int) bool {
-	a := &x[i]
-	b := &x[j]
-	if a.lineno != b.lineno {
-		return a.lineno < b.lineno
-	}
-	if a.seq != b.seq {
-		return a.seq < b.seq
-	}
-	return a.msg < b.msg
-}
+func (x byLineno) Len() int           { return len(x) }
+func (x byLineno) Less(i, j int) bool { return x[i].lineno < x[j].lineno }
+func (x byLineno) Swap(i, j int)      { x[i], x[j] = x[j], x[i] }
 
 func Flusherrors() {
 	bstdout.Flush()
 	if len(errors) == 0 {
 		return
 	}
-	sort.Sort(errcmp(errors))
+	sort.Stable(byLineno(errors))
 	for i := 0; i < len(errors); i++ {
 		if i == 0 || errors[i].msg != errors[i-1].msg {
 			fmt.Printf("%s", errors[i].msg)
@@ -109,7 +97,7 @@ func yyerrorl(line int, format string, args ...interface{}) {
 	}
 }
 
-var yyerror_lastsyntax int
+var yyerror_lastsyntax int32
 
 func Yyerror(format string, args ...interface{}) {
 	msg := fmt.Sprintf(format, args...)
@@ -117,18 +105,12 @@ func Yyerror(format string, args ...interface{}) {
 		nsyntaxerrors++
 
 		// only one syntax error per line
-		if int32(yyerror_lastsyntax) == lexlineno {
+		if yyerror_lastsyntax == lineno {
 			return
 		}
-		yyerror_lastsyntax = int(lexlineno)
+		yyerror_lastsyntax = lineno
 
-		// plain "syntax error" gets "near foo" added
-		if msg == "syntax error" {
-			yyerrorl(int(lexlineno), "syntax error near %s", lexbuf.String())
-			return
-		}
-
-		yyerrorl(int(lexlineno), "%s", msg)
+		yyerrorl(int(lineno), "%s", msg)
 		return
 	}
 
@@ -258,7 +240,6 @@ func (pkg *Pkg) Lookup(name string) *Sym {
 	s := &Sym{
 		Name: name,
 		Pkg:  pkg,
-		Lexical: LNAME,
 	}
 	if name == "init" {
 		initSyms = append(initSyms, s)
@@ -367,162 +348,6 @@ func saveorignode(n *Node) {
 	n.Orig = norig
 }
 
-// ispaddedfield reports whether the given field
-// is followed by padding. For the case where t is
-// the last field, total gives the size of the enclosing struct.
-func ispaddedfield(t *Type, total int64) bool {
-	if t.Etype != TFIELD {
-		Fatalf("ispaddedfield called non-field %v", t)
-	}
-	if t.Down == nil {
-		return t.Width+t.Type.Width != total
-	}
-	return t.Width+t.Type.Width != t.Down.Width
-}
-
-func algtype1(t *Type, bad **Type) int {
-	if bad != nil {
-		*bad = nil
-	}
-	if t.Broke {
-		return AMEM
-	}
-	if t.Noalg {
-		return ANOEQ
-	}
-
-	switch t.Etype {
-	// will be defined later.
-	case TANY, TFORW:
-		*bad = t
-
-		return -1
-
-	case TINT8,
-		TUINT8,
-		TINT16,
-		TUINT16,
-		TINT32,
-		TUINT32,
-		TINT64,
-		TUINT64,
-		TINT,
-		TUINT,
-		TUINTPTR,
-		TBOOL,
-		TPTR32,
-		TPTR64,
-		TCHAN,
-		TUNSAFEPTR:
-		return AMEM
-
-	case TFUNC, TMAP:
-		if bad != nil {
-			*bad = t
-		}
-		return ANOEQ
-
-	case TFLOAT32:
-		return AFLOAT32
-
-	case TFLOAT64:
-		return AFLOAT64
-
-	case TCOMPLEX64:
-		return ACPLX64
-
-	case TCOMPLEX128:
-		return ACPLX128
-
-	case TSTRING:
-		return ASTRING
-
-	case TINTER:
-		if isnilinter(t) {
-			return ANILINTER
-		}
-		return AINTER
-
-	case TARRAY:
-		if Isslice(t) {
-			if bad != nil {
-				*bad = t
-			}
-			return ANOEQ
-		}
-
-		a := algtype1(t.Type, bad)
-		if a == ANOEQ || a == AMEM {
-			if a == ANOEQ && bad != nil {
-				*bad = t
-			}
-			return a
-		}
-
-		switch t.Bound {
-		case 0:
-			// We checked above that the element type is comparable.
-			return AMEM
-		case 1:
-			// Single-element array is same as its lone element.
-			return a
-		}
-
-		return -1 // needs special compare
-
-	case TSTRUCT:
-		if t.Type != nil && t.Type.Down == nil && !isblanksym(t.Type.Sym) {
-			// One-field struct is same as that one field alone.
-			return algtype1(t.Type.Type, bad)
-		}
-
-		ret := AMEM
-		var a int
-		for t1 := t.Type; t1 != nil; t1 = t1.Down {
-			// All fields must be comparable.
-			a = algtype1(t1.Type, bad)
-
-			if a == ANOEQ {
-				return ANOEQ
-			}
-
-			// Blank fields, padded fields, fields with non-memory
-			// equality need special compare.
-			if a != AMEM || isblanksym(t1.Sym) || ispaddedfield(t1, t.Width) {
-				ret = -1
-				continue
-			}
-		}
-
-		return ret
-	}
-
-	Fatalf("algtype1: unexpected type %v", t)
-	return 0
-}
-
-func algtype(t *Type) int {
-	a := algtype1(t, nil)
-	if a == AMEM {
-		switch t.Width {
-		case 0:
-			return AMEM0
-		case 1:
-			return AMEM8
-		case 2:
-			return AMEM16
-		case 4:
-			return AMEM32
-		case 8:
-			return AMEM64
-		case 16:
-			return AMEM128
-		}
-	}
-
-	return a
-}
-
 func maptype(key *Type, val *Type) *Type {
 	if key != nil {
 		var bad *Type
@@ -1561,8 +1386,8 @@ func frame(context int) {
 
 	if Curfn != nil {
 		fmt.Printf("--- %v frame ---\n", Curfn.Func.Nname.Sym)
-		for l := Curfn.Func.Dcl; l != nil; l = l.Next {
-			printframenode(l.N)
+		for _, ln := range Curfn.Func.Dcl {
+			printframenode(ln)
 		}
 	}
 }
@@ -2414,457 +2239,6 @@ func hashmem(t *Type) *Node {
 	return n
 }
 
-func hashfor(t *Type) *Node {
-	var sym *Sym
-
-	a := algtype1(t, nil)
-	switch a {
-	case AMEM:
-		Fatalf("hashfor with AMEM type")
-
-	case AINTER:
-		sym = Pkglookup("interhash", Runtimepkg)
-
-	case ANILINTER:
-		sym = Pkglookup("nilinterhash", Runtimepkg)
-
-	case ASTRING:
-		sym = Pkglookup("strhash", Runtimepkg)
-
-	case AFLOAT32:
-		sym = Pkglookup("f32hash", Runtimepkg)
-
-	case AFLOAT64:
-		sym = Pkglookup("f64hash", Runtimepkg)
-
-	case ACPLX64:
-		sym = Pkglookup("c64hash", Runtimepkg)
-
-	case ACPLX128:
-		sym = Pkglookup("c128hash", Runtimepkg)
-
-	default:
-		sym = typesymprefix(".hash", t)
-	}
-
-	n := newname(sym)
-	n.Class = PFUNC
-	tfn := Nod(OTFUNC, nil, nil)
-	tfn.List = list(tfn.List, Nod(ODCLFIELD, nil, typenod(Ptrto(t))))
-	tfn.List = list(tfn.List, Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])))
-	tfn.Rlist = list(tfn.Rlist, Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])))
-	typecheck(&tfn, Etype)
-	n.Type = tfn.Type
-	return n
-}
-
-// Generate a helper function to compute the hash of a value of type t.
-func genhash(sym *Sym, t *Type) {
-	if Debug['r'] != 0 {
-		fmt.Printf("genhash %v %v\n", sym, t)
-	}
-
-	lineno = 1 // less confusing than end of input
-	dclcontext = PEXTERN
-	markdcl()
-
-	// func sym(p *T, h uintptr) uintptr
-	fn := Nod(ODCLFUNC, nil, nil)
-
-	fn.Func.Nname = newname(sym)
-	fn.Func.Nname.Class = PFUNC
-	tfn := Nod(OTFUNC, nil, nil)
-	fn.Func.Nname.Name.Param.Ntype = tfn
-
-	n := Nod(ODCLFIELD, newname(Lookup("p")), typenod(Ptrto(t)))
-	tfn.List = list(tfn.List, n)
-	np := n.Left
-	n = Nod(ODCLFIELD, newname(Lookup("h")), typenod(Types[TUINTPTR]))
-	tfn.List = list(tfn.List, n)
-	nh := n.Left
-	n = Nod(ODCLFIELD, nil, typenod(Types[TUINTPTR])) // return value
-	tfn.Rlist = list(tfn.Rlist, n)
-
-	funchdr(fn)
-	typecheck(&fn.Func.Nname.Name.Param.Ntype, Etype)
-
-	// genhash is only called for types that have equality but
-	// cannot be handled by the standard algorithms,
-	// so t must be either an array or a struct.
-	switch t.Etype {
-	default:
-		Fatalf("genhash %v", t)
-
-	case TARRAY:
-		if Isslice(t) {
-			Fatalf("genhash %v", t)
-		}
-
-		// An array of pure memory would be handled by the
-		// standard algorithm, so the element type must not be
-		// pure memory.
-		hashel := hashfor(t.Type)
-
-		n := Nod(ORANGE, nil, Nod(OIND, np, nil))
-		ni := newname(Lookup("i"))
-		ni.Type = Types[TINT]
-		n.List = list1(ni)
-		n.Colas = true
-		colasdefn(n.List, n)
-		ni = n.List.N
-
-		// h = hashel(&p[i], h)
-		call := Nod(OCALL, hashel, nil)
-
-		nx := Nod(OINDEX, np, ni)
-		nx.Bounded = true
-		na := Nod(OADDR, nx, nil)
-		na.Etype = 1 // no escape to heap
-		call.List = list(call.List, na)
-		call.List = list(call.List, nh)
-		n.Nbody = list(n.Nbody, Nod(OAS, nh, call))
-
-		fn.Nbody = list(fn.Nbody, n)
-
-		// Walk the struct using memhash for runs of AMEM
-	// and calling specific hash functions for the others.
-	case TSTRUCT:
-		var first *Type
-
-		offend := int64(0)
-		var size int64
-		var call *Node
-		var nx *Node
-		var na *Node
-		var hashel *Node
-		for t1 := t.Type; ; t1 = t1.Down {
-			if t1 != nil && algtype1(t1.Type, nil) == AMEM && !isblanksym(t1.Sym) {
-				offend = t1.Width + t1.Type.Width
-				if first == nil {
-					first = t1
-				}
-
-				// If it's a memory field but it's padded, stop here.
-				if ispaddedfield(t1, t.Width) {
-					t1 = t1.Down
-				} else {
-					continue
-				}
-			}
-
-			// Run memhash for fields up to this one.
-			if first != nil {
-				size = offend - first.Width // first->width is offset
-				hashel = hashmem(first.Type)
-
-				// h = hashel(&p.first, size, h)
-				call = Nod(OCALL, hashel, nil)
-
-				nx = Nod(OXDOT, np, newname(first.Sym)) // TODO: fields from other packages?
-				na = Nod(OADDR, nx, nil)
-				na.Etype = 1 // no escape to heap
-				call.List = list(call.List, na)
-				call.List = list(call.List, nh)
-				call.List = list(call.List, Nodintconst(size))
-				fn.Nbody = list(fn.Nbody, Nod(OAS, nh, call))
-
-				first = nil
-			}
-
-			if t1 == nil {
-				break
-			}
-			if isblanksym(t1.Sym) {
-				continue
-			}
-
-			// Run hash for this field.
-			if algtype1(t1.Type, nil) == AMEM {
-				hashel = hashmem(t1.Type)
-
-				// h = memhash(&p.t1, h, size)
-				call = Nod(OCALL, hashel, nil)
-
-				nx = Nod(OXDOT, np, newname(t1.Sym)) // TODO: fields from other packages?
-				na = Nod(OADDR, nx, nil)
-				na.Etype = 1 // no escape to heap
-				call.List = list(call.List, na)
-				call.List = list(call.List, nh)
-				call.List = list(call.List, Nodintconst(t1.Type.Width))
-				fn.Nbody = list(fn.Nbody, Nod(OAS, nh, call))
-			} else {
-				hashel = hashfor(t1.Type)
-
-				// h = hashel(&p.t1, h)
-				call = Nod(OCALL, hashel, nil)
-
-				nx = Nod(OXDOT, np, newname(t1.Sym)) // TODO: fields from other packages?
-				na = Nod(OADDR, nx, nil)
-				na.Etype = 1 // no escape to heap
-				call.List = list(call.List, na)
-				call.List = list(call.List, nh)
-				fn.Nbody = list(fn.Nbody, Nod(OAS, nh, call))
-			}
-		}
-	}
-
-	r := Nod(ORETURN, nil, nil)
-	r.List = list(r.List, nh)
-	fn.Nbody = list(fn.Nbody, r)
-
-	if Debug['r'] != 0 {
-		dumplist("genhash body", fn.Nbody)
-	}
-
-	funcbody(fn)
-	Curfn = fn
-	fn.Func.Dupok = true
-	typecheck(&fn, Etop)
-	typechecklist(fn.Nbody, Etop)
-	Curfn = nil
-
-	// Disable safemode while compiling this code: the code we
-	// generate internally can refer to unsafe.Pointer.
-	// In this case it can happen if we need to generate an ==
-	// for a struct containing a reflect.Value, which itself has
-	// an unexported field of type unsafe.Pointer.
-	old_safemode := safemode
-
-	safemode = 0
-	funccompile(fn)
-	safemode = old_safemode
-}
-
-// eqfield returns the node
-// 	p.field == q.field
-func eqfield(p *Node, q *Node, field *Node) *Node {
-	nx := Nod(OXDOT, p, field)
-	ny := Nod(OXDOT, q, field)
-	ne := Nod(OEQ, nx, ny)
-	return ne
-}
-
-func eqmemfunc(size int64, type_ *Type, needsize *int) *Node {
-	var fn *Node
-
-	switch size {
-	default:
-		fn = syslook("memequal", 1)
-		*needsize = 1
-
-	case 1, 2, 4, 8, 16:
-		buf := fmt.Sprintf("memequal%d", int(size)*8)
-		fn = syslook(buf, 1)
-		*needsize = 0
-	}
-
-	substArgTypes(fn, type_, type_)
-	return fn
-}
-
-// eqmem returns the node
-// 	memequal(&p.field, &q.field [, size])
-func eqmem(p *Node, q *Node, field *Node, size int64) *Node {
-	var needsize int
-
-	nx := Nod(OADDR, Nod(OXDOT, p, field), nil)
-	nx.Etype = 1 // does not escape
-	ny := Nod(OADDR, Nod(OXDOT, q, field), nil)
-	ny.Etype = 1 // does not escape
-	typecheck(&nx, Erv)
-	typecheck(&ny, Erv)
-
-	call := Nod(OCALL, eqmemfunc(size, nx.Type.Type, &needsize), nil)
-	call.List = list(call.List, nx)
-	call.List = list(call.List, ny)
-	if needsize != 0 {
-		call.List = list(call.List, Nodintconst(size))
-	}
-
-	return call
-}
-
-// geneq generates a helper function to
-// check equality of two values of type t.
-func geneq(sym *Sym, t *Type) {
-	if Debug['r'] != 0 {
-		fmt.Printf("geneq %v %v\n", sym, t)
-	}
-
-	lineno = 1 // less confusing than end of input
-	dclcontext = PEXTERN
-	markdcl()
-
-	// func sym(p, q *T) bool
-	fn := Nod(ODCLFUNC, nil, nil)
-
-	fn.Func.Nname = newname(sym)
-	fn.Func.Nname.Class = PFUNC
-	tfn := Nod(OTFUNC, nil, nil)
-	fn.Func.Nname.Name.Param.Ntype = tfn
-
-	n := Nod(ODCLFIELD, newname(Lookup("p")), typenod(Ptrto(t)))
-	tfn.List = list(tfn.List, n)
-	np := n.Left
-	n = Nod(ODCLFIELD, newname(Lookup("q")), typenod(Ptrto(t)))
-	tfn.List = list(tfn.List, n)
-	nq := n.Left
-	n = Nod(ODCLFIELD, nil, typenod(Types[TBOOL]))
-	tfn.Rlist = list(tfn.Rlist, n)
-
-	funchdr(fn)
-
-	// geneq is only called for types that have equality but
-	// cannot be handled by the standard algorithms,
-	// so t must be either an array or a struct.
-	switch t.Etype {
-	default:
-		Fatalf("geneq %v", t)
-
-	case TARRAY:
-		if Isslice(t) {
-			Fatalf("geneq %v", t)
-		}
-
-		// An array of pure memory would be handled by the
-		// standard memequal, so the element type must not be
-		// pure memory.  Even if we unrolled the range loop,
-		// each iteration would be a function call, so don't bother
-		// unrolling.
-		nrange := Nod(ORANGE, nil, Nod(OIND, np, nil))
-
-		ni := newname(Lookup("i"))
-		ni.Type = Types[TINT]
-		nrange.List = list1(ni)
-		nrange.Colas = true
-		colasdefn(nrange.List, nrange)
-		ni = nrange.List.N
-
-		// if p[i] != q[i] { return false }
-		nx := Nod(OINDEX, np, ni)
-
-		nx.Bounded = true
-		ny := Nod(OINDEX, nq, ni)
-		ny.Bounded = true
-
-		nif := Nod(OIF, nil, nil)
-		nif.Left = Nod(ONE, nx, ny)
-		r := Nod(ORETURN, nil, nil)
-		r.List = list(r.List, Nodbool(false))
-		nif.Nbody = list(nif.Nbody, r)
-		nrange.Nbody = list(nrange.Nbody, nif)
-		fn.Nbody = list(fn.Nbody, nrange)
-
-		// return true
-		ret := Nod(ORETURN, nil, nil)
-		ret.List = list(ret.List, Nodbool(true))
-		fn.Nbody = list(fn.Nbody, ret)
-
-	// Walk the struct using memequal for runs of AMEM
-	// and calling specific equality tests for the others.
-	// Skip blank-named fields.
-	case TSTRUCT:
-		var first *Type
-
-		var conjuncts []*Node
-		offend := int64(0)
-		var size int64
-		for t1 := t.Type; ; t1 = t1.Down {
-			if t1 != nil && algtype1(t1.Type, nil) == AMEM && !isblanksym(t1.Sym) {
-				offend = t1.Width + t1.Type.Width
-				if first == nil {
-					first = t1
-				}
-
-				// If it's a memory field but it's padded, stop here.
-				if ispaddedfield(t1, t.Width) {
-					t1 = t1.Down
-				} else {
-					continue
-				}
-			}
-
-			// Run memequal for fields up to this one.
-			// TODO(rsc): All the calls to newname are wrong for
-			// cross-package unexported fields.
-			if first != nil {
-				if first.Down == t1 {
-					conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
-				} else if first.Down.Down == t1 {
-					conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
-					first = first.Down
-					if !isblanksym(first.Sym) {
-						conjuncts = append(conjuncts, eqfield(np, nq, newname(first.Sym)))
-					}
-				} else {
-					// More than two fields: use memequal.
-					size = offend - first.Width // first->width is offset
-					conjuncts = append(conjuncts, eqmem(np, nq, newname(first.Sym), size))
-				}
-
-				first = nil
-			}
-
-			if t1 == nil {
-				break
-			}
-			if isblanksym(t1.Sym) {
-				continue
-			}
-
-			// Check this field, which is not just memory.
-			conjuncts = append(conjuncts, eqfield(np, nq, newname(t1.Sym)))
-		}
-
-		var and *Node
-		switch len(conjuncts) {
-		case 0:
-			and = Nodbool(true)
-		case 1:
-			and = conjuncts[0]
-		default:
-			and = Nod(OANDAND, conjuncts[0], conjuncts[1])
-			for _, conjunct := range conjuncts[2:] {
-				and = Nod(OANDAND, and, conjunct)
-			}
-		}
-
-		ret := Nod(ORETURN, nil, nil)
-		ret.List = list(ret.List, and)
-		fn.Nbody = list(fn.Nbody, ret)
-	}
-
-	if Debug['r'] != 0 {
-		dumplist("geneq body", fn.Nbody)
-	}
-
-	funcbody(fn)
-	Curfn = fn
-	fn.Func.Dupok = true
-	typecheck(&fn, Etop)
-	typechecklist(fn.Nbody, Etop)
-	Curfn = nil
-
-	// Disable safemode while compiling this code: the code we
-	// generate internally can refer to unsafe.Pointer.
-	// In this case it can happen if we need to generate an ==
-	// for a struct containing a reflect.Value, which itself has
-	// an unexported field of type unsafe.Pointer.
-	old_safemode := safemode
-	safemode = 0
-
-	// Disable checknils while compiling this code.
-	// We are comparing a struct or an array,
-	// neither of which can be nil, and our comparisons
-	// are shallow.
-	Disable_checknil++
-
-	funccompile(fn)
-
-	safemode = old_safemode
-	Disable_checknil--
-}
-
 func ifacelookdot(s *Sym, t *Type, followptr *bool, ignorecase int) *Type {
 	*followptr = false
 

src/cmd/compile/internal/gc/syntax.go

@@ -149,11 +149,11 @@ type Param struct {
 // Func holds Node fields used only with function-like nodes.
 type Func struct {
 	Shortname  *Node
-	Enter      *NodeList // for example, allocate and initialize memory for escaping parameters
-	Exit       *NodeList
-	Cvars      *NodeList // closure params
-	Dcl        *NodeList // autodcl for this func/closure
-	Inldcl     *NodeList // copy of dcl for use in inlining
+	Enter      Nodes // for example, allocate and initialize memory for escaping parameters
+	Exit       Nodes
+	Cvars      Nodes    // closure params
+	Dcl        []*Node  // autodcl for this func/closure
+	Inldcl     *[]*Node // copy of dcl for use in inlining
 	Closgen    int
 	Outerfunc  *Node
 	Fieldtrack []*Type
@@ -169,18 +169,12 @@ type Func struct {
 	Depth   int32
 
 	Endlineno int32
+	WBLineno  int32 // line number of first write barrier
 
-	Norace            bool // func must not have race detector annotations
-	Nosplit           bool // func should not execute on separate stack
-	Noinline          bool // func should not be inlined
-	Nowritebarrier    bool // emit compiler error instead of write barrier
-	Nowritebarrierrec bool // error on write barrier in this or recursive callees
+	Pragma   Pragma // go:xxx function annotations
 	Dupok    bool   // duplicate definitions ok
 	Wrapper  bool   // is method wrapper
 	Needctxt bool   // function uses context register (has closure variables)
-	Systemstack       bool // must run on system stack
-
-	WBLineno int32 // line number of first write barrier
 }
 
 type Op uint8
@@ -491,3 +485,55 @@ func count(l *NodeList) int {
 	}
 	return int(n)
 }
+
+// Nodes is a pointer to a slice of *Node.
+// For fields that are not used in most nodes, this is used instead of
+// a slice to save space.
+type Nodes struct{ slice *[]*Node }
+
+// Slice returns the entries in Nodes as a slice.
+// Changes to the slice entries (as in s[i] = n) will be reflected in
+// the Nodes.
+func (n *Nodes) Slice() []*Node {
+	if n.slice == nil {
+		return nil
+	}
+	return *n.slice
+}
+
+// NodeList returns the entries in Nodes as a NodeList.
+// Changes to the NodeList entries (as in l.N = n) will *not* be
+// reflect in the Nodes.
+// This wastes memory and should be used as little as possible.
+func (n *Nodes) NodeList() *NodeList {
+	if n.slice == nil {
+		return nil
+	}
+	var ret *NodeList
+	for _, n := range *n.slice {
+		ret = list(ret, n)
+	}
+	return ret
+}
+
+// Set sets Nodes to a slice.
+// This takes ownership of the slice.
+func (n *Nodes) Set(s []*Node) {
+	if len(s) == 0 {
+		n.slice = nil
+	} else {
+		n.slice = &s
+	}
+}
+
+// Append appends entries to Nodes.
+// If a slice is passed in, this will take ownership of it.
+func (n *Nodes) Append(a ...*Node) {
+	if n.slice == nil {
+		if len(a) > 0 {
+			n.slice = &a
+		}
+	} else {
+		*n.slice = append(*n.slice, a...)
+	}
+}

src/cmd/compile/internal/gc/typecheck.go

@@ -40,6 +40,12 @@ func typechecklist(l *NodeList, top int) {
 	}
 }
 
+func typecheckslice(l []*Node, top int) {
+	for i := range l {
+		typecheck(&l[i], top)
+	}
+}
+
 var _typekind = []string{
 	TINT:        "int",
 	TUINT:       "uint",
@@ -3433,9 +3439,9 @@ func typecheckfunc(n *Node) {
 		addmethod(n.Func.Shortname.Sym, t, true, n.Func.Nname.Nointerface)
 	}
 
-	for l := n.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op == ONAME && (l.N.Class == PPARAM || l.N.Class == PPARAMOUT) {
-			l.N.Name.Decldepth = 1
+	for _, ln := range n.Func.Dcl {
+		if ln.Op == ONAME && (ln.Class == PPARAM || ln.Class == PPARAMOUT) {
+			ln.Name.Decldepth = 1
 		}
 	}
 }

src/cmd/compile/internal/gc/walk.go

@@ -29,33 +29,34 @@ func walk(fn *Node) {
 
 	// Final typecheck for any unused variables.
 	// It's hard to be on the heap when not-used, but best to be consistent about &~PHEAP here and below.
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op == ONAME && l.N.Class&^PHEAP == PAUTO {
-			typecheck(&l.N, Erv|Easgn)
+	for i, ln := range fn.Func.Dcl {
+		if ln.Op == ONAME && ln.Class&^PHEAP == PAUTO {
+			typecheck(&ln, Erv|Easgn)
+			fn.Func.Dcl[i] = ln
 		}
 	}
 
 	// Propagate the used flag for typeswitch variables up to the NONAME in it's definition.
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op == ONAME && l.N.Class&^PHEAP == PAUTO && l.N.Name.Defn != nil && l.N.Name.Defn.Op == OTYPESW && l.N.Used {
-			l.N.Name.Defn.Left.Used = true
+	for _, ln := range fn.Func.Dcl {
+		if ln.Op == ONAME && ln.Class&^PHEAP == PAUTO && ln.Name.Defn != nil && ln.Name.Defn.Op == OTYPESW && ln.Used {
+			ln.Name.Defn.Left.Used = true
 		}
 	}
 
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		if l.N.Op != ONAME || l.N.Class&^PHEAP != PAUTO || l.N.Sym.Name[0] == '&' || l.N.Used {
+	for _, ln := range fn.Func.Dcl {
+		if ln.Op != ONAME || ln.Class&^PHEAP != PAUTO || ln.Sym.Name[0] == '&' || ln.Used {
 			continue
 		}
-		if defn := l.N.Name.Defn; defn != nil && defn.Op == OTYPESW {
+		if defn := ln.Name.Defn; defn != nil && defn.Op == OTYPESW {
 			if defn.Left.Used {
 				continue
 			}
 			lineno = defn.Left.Lineno
-			Yyerror("%v declared and not used", l.N.Sym)
+			Yyerror("%v declared and not used", ln.Sym)
 			defn.Left.Used = true // suppress repeats
 		} else {
-			lineno = l.N.Lineno
-			Yyerror("%v declared and not used", l.N.Sym)
+			lineno = ln.Lineno
+			Yyerror("%v declared and not used", ln.Sym)
 		}
 	}
 
@@ -70,9 +71,9 @@ func walk(fn *Node) {
 	}
 
 	heapmoves()
-	if Debug['W'] != 0 && Curfn.Func.Enter != nil {
+	if Debug['W'] != 0 && len(Curfn.Func.Enter.Slice()) > 0 {
 		s := fmt.Sprintf("enter %v", Curfn.Func.Nname.Sym)
-		dumplist(s, Curfn.Func.Enter)
+		dumpslice(s, Curfn.Func.Enter.Slice())
 	}
 }
 
@@ -82,6 +83,12 @@ func walkstmtlist(l *NodeList) {
 	}
 }
 
+func walkstmtslice(l []*Node) {
+	for i := range l {
+		walkstmt(&l[i])
+	}
+}
+
 func samelist(a *NodeList, b *NodeList) bool {
 	for ; a != nil && b != nil; a, b = a.Next, b.Next {
 		if a.N != b.N {
@@ -92,11 +99,11 @@ func samelist(a *NodeList, b *NodeList) bool {
 }
 
 func paramoutheap(fn *Node) bool {
-	for l := fn.Func.Dcl; l != nil; l = l.Next {
-		switch l.N.Class {
+	for _, ln := range fn.Func.Dcl {
+		switch ln.Class {
 		case PPARAMOUT,
 			PPARAMOUT | PHEAP:
-			return l.N.Addrtaken
+			return ln.Addrtaken
 
 			// stop early - parameters are over
 		case PAUTO,
@@ -290,13 +297,13 @@ func walkstmt(np **Node) {
 			var rl *NodeList
 
 			var cl Class
-			for ll := Curfn.Func.Dcl; ll != nil; ll = ll.Next {
-				cl = ll.N.Class &^ PHEAP
+			for _, ln := range Curfn.Func.Dcl {
+				cl = ln.Class &^ PHEAP
 				if cl == PAUTO {
 					break
 				}
 				if cl == PPARAMOUT {
-					rl = list(rl, ll.N)
+					rl = list(rl, ln)
 				}
 			}
 
@@ -319,7 +326,7 @@ func walkstmt(np **Node) {
 			ll := ascompatee(n.Op, rl, n.List, &n.Ninit)
 			n.List = reorder3(ll)
 			for lr := n.List; lr != nil; lr = lr.Next {
-				lr.N = applywritebarrier(lr.N, &n.Ninit)
+				lr.N = applywritebarrier(lr.N)
 			}
 			break
 		}
@@ -587,9 +594,9 @@ opswitch:
 			// transformclosure already did all preparation work.
 
 			// Prepend captured variables to argument list.
-			n.List = concat(n.Left.Func.Enter, n.List)
+			n.List = concat(n.Left.Func.Enter.NodeList(), n.List)
 
-			n.Left.Func.Enter = nil
+			n.Left.Func.Enter.Set(nil)
 
 			// Replace OCLOSURE with ONAME/PFUNC.
 			n.Left = n.Left.Func.Closure.Func.Nname
@@ -723,7 +730,7 @@ opswitch:
 			r := convas(Nod(OAS, n.Left, n.Right), init)
 			r.Dodata = n.Dodata
 			n = r
-			n = applywritebarrier(n, init)
+			n = applywritebarrier(n)
 		}
 
 	case OAS2:
@@ -734,7 +741,7 @@ opswitch:
 		ll := ascompatee(OAS, n.List, n.Rlist, init)
 		ll = reorder3(ll)
 		for lr := ll; lr != nil; lr = lr.Next {
-			lr.N = applywritebarrier(lr.N, init)
+			lr.N = applywritebarrier(lr.N)
 		}
 		n = liststmt(ll)
 
@@ -749,7 +756,7 @@ opswitch:
 
 		ll := ascompatet(n.Op, n.List, &r.Type, 0, init)
 		for lr := ll; lr != nil; lr = lr.Next {
-			lr.N = applywritebarrier(lr.N, init)
+			lr.N = applywritebarrier(lr.N)
 		}
 		n = liststmt(concat(list1(r), ll))
 
@@ -2132,7 +2139,7 @@ func needwritebarrier(l *Node, r *Node) bool {
 
 // TODO(rsc): Perhaps componentgen should run before this.
 
-func applywritebarrier(n *Node, init **NodeList) *Node {
+func applywritebarrier(n *Node) *Node {
 	if n.Left != nil && n.Right != nil && needwritebarrier(n.Left, n.Right) {
 		if Debug_wb > 1 {
 			Warnl(int(n.Lineno), "marking %v for barrier", Nconv(n.Left, 0))
@@ -2541,12 +2548,12 @@ func vmatch1(l *Node, r *Node) bool {
 // walk through argin parameters.
 // generate and return code to allocate
 // copies of escaped parameters to the heap.
-func paramstoheap(argin **Type, out int) *NodeList {
+func paramstoheap(argin **Type, out int) []*Node {
 	var savet Iter
 	var v *Node
 	var as *Node
 
-	var nn *NodeList
+	var nn []*Node
 	for t := Structfirst(&savet, argin); t != nil; t = structnext(&savet) {
 		v = t.Nname
 		if v != nil && v.Sym != nil && v.Sym.Name[0] == '~' && v.Sym.Name[1] == 'r' { // unnamed result
@@ -2559,7 +2566,7 @@ func paramstoheap(argin **Type, out int) *NodeList {
 			// Defer might stop a panic and show the
 			// return values as they exist at the time of panic.
 			// Make sure to zero them on entry to the function.
-			nn = list(nn, Nod(OAS, nodarg(t, -1), nil))
+			nn = append(nn, Nod(OAS, nodarg(t, -1), nil))
 		}
 
 		if v == nil || v.Class&PHEAP == 0 {
@@ -2573,13 +2580,13 @@ func paramstoheap(argin **Type, out int) *NodeList {
 		if prealloc[v] == nil {
 			prealloc[v] = callnew(v.Type)
 		}
-		nn = list(nn, Nod(OAS, v.Name.Heapaddr, prealloc[v]))
+		nn = append(nn, Nod(OAS, v.Name.Heapaddr, prealloc[v]))
 		if v.Class&^PHEAP != PPARAMOUT {
 			as = Nod(OAS, v, v.Name.Param.Stackparam)
 			v.Name.Param.Stackparam.Typecheck = 1
 			typecheck(&as, Etop)
-			as = applywritebarrier(as, &nn)
-			nn = list(nn, as)
+			as = applywritebarrier(as)
+			nn = append(nn, as)
 		}
 	}
 
@@ -2587,17 +2594,17 @@ func paramstoheap(argin **Type, out int) *NodeList {
 }
 
 // walk through argout parameters copying back to stack
-func returnsfromheap(argin **Type) *NodeList {
+func returnsfromheap(argin **Type) []*Node {
 	var savet Iter
 	var v *Node
 
-	var nn *NodeList
+	var nn []*Node
 	for t := Structfirst(&savet, argin); t != nil; t = structnext(&savet) {
 		v = t.Nname
 		if v == nil || v.Class != PHEAP|PPARAMOUT {
 			continue
 		}
-		nn = list(nn, Nod(OAS, v.Name.Param.Stackparam, v))
+		nn = append(nn, Nod(OAS, v.Name.Param.Stackparam, v))
 	}
 
 	return nn
@@ -2610,11 +2617,11 @@ func heapmoves() {
 	lno := lineno
 	lineno = Curfn.Lineno
 	nn := paramstoheap(getthis(Curfn.Type), 0)
-	nn = concat(nn, paramstoheap(getinarg(Curfn.Type), 0))
-	nn = concat(nn, paramstoheap(Getoutarg(Curfn.Type), 1))
-	Curfn.Func.Enter = concat(Curfn.Func.Enter, nn)
+	nn = append(nn, paramstoheap(getinarg(Curfn.Type), 0)...)
+	nn = append(nn, paramstoheap(Getoutarg(Curfn.Type), 1)...)
+	Curfn.Func.Enter.Append(nn...)
 	lineno = Curfn.Func.Endlineno
-	Curfn.Func.Exit = returnsfromheap(Getoutarg(Curfn.Type))
+	Curfn.Func.Exit.Append(returnsfromheap(Getoutarg(Curfn.Type))...)
 	lineno = lno
 }
 

src/cmd/compile/internal/mips64/ggen.go

@@ -12,8 +12,6 @@ import (
 )
 
 func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
-
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -30,8 +28,7 @@ func defframe(ptxt *obj.Prog) {
 	lo := hi
 
 	// iterate through declarations - they are sorted in decreasing xoffset order.
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}

src/cmd/compile/internal/ppc64/ggen.go

@@ -12,8 +12,6 @@ import (
 )
 
 func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
-
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -30,8 +28,7 @@ func defframe(ptxt *obj.Prog) {
 	lo := hi
 
 	// iterate through declarations - they are sorted in decreasing xoffset order.
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}
@@ -133,7 +130,7 @@ func dodiv(op gc.Op, nl *gc.Node, nr *gc.Node, res *gc.Node) {
 	// The hardware will generate undefined result.
 	// Also need to explicitly trap on division on zero,
 	// the hardware will silently generate undefined result.
-	// DIVW will leave unpredicable result in higher 32-bit,
+	// DIVW will leave unpredictable result in higher 32-bit,
 	// so always use DIVD/DIVDU.
 	t := nl.Type
 

src/cmd/compile/internal/x86/ggen.go

@@ -11,8 +11,6 @@ import (
 )
 
 func defframe(ptxt *obj.Prog) {
-	var n *gc.Node
-
 	// fill in argument size, stack size
 	ptxt.To.Type = obj.TYPE_TEXTSIZE
 
@@ -28,8 +26,7 @@ func defframe(ptxt *obj.Prog) {
 	hi := int64(0)
 	lo := hi
 	ax := uint32(0)
-	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
-		n = l.N
+	for _, n := range gc.Curfn.Func.Dcl {
 		if !n.Name.Needzero {
 			continue
 		}

src/cmd/compile/internal/x86/peep.go

@@ -284,7 +284,7 @@ func elimshortmov(g *gc.Graph) {
 			}
 
 			if regtyp(&p.From) || p.From.Type == obj.TYPE_CONST {
-				// move or artihmetic into partial register.
+				// move or arithmetic into partial register.
 				// from another register or constant can be movl.
 				// we don't switch to 32-bit arithmetic if it can
 				// change how the carry bit is set (and the carry bit is needed).

src/cmd/dist/build.go

@@ -6,6 +6,7 @@ package main
 
 import (
 	"bytes"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"os"
@@ -463,6 +464,9 @@ var deptab = []struct {
 	{"runtime/internal/sys", []string{
 		"zversion.go",
 	}},
+	{"go/build", []string{
+		"zcgo.go",
+	}},
 }
 
 // depsuffix records the allowed suffixes for source files.
@@ -478,6 +482,7 @@ var gentab = []struct {
 }{
 	{"zdefaultcc.go", mkzdefaultcc},
 	{"zversion.go", mkzversion},
+	{"zcgo.go", mkzcgo},
 
 	// not generated anymore, but delete the file if we see it
 	{"enam.c", nil},
@@ -933,6 +938,7 @@ func usage() {
 		"clean          deletes all built files\n" +
 		"env [-p]       print environment (-p: include $PATH)\n" +
 		"install [dir]  install individual directory\n" +
+		"list [-json]   list all supported platforms\n" +
 		"test [-h]      run Go test(s)\n" +
 		"version        print Go version\n" +
 		"\n" +
@@ -1061,9 +1067,13 @@ func cmdbootstrap() {
 	}
 }
 
-// Copied from go/build/build.go.
 // Cannot use go/build directly because cmd/dist for a new release
 // builds against an old release's go/build, which may be out of sync.
+// To reduce duplication, we generate the list for go/build from this.
+//
+// We list all supported platforms in this list, so that this is the
+// single point of truth for supported platforms. This list is used
+// by 'go tool dist list'.
 var cgoEnabled = map[string]bool{
 	"darwin/386":      true,
 	"darwin/amd64":    true,
@@ -1072,19 +1082,31 @@ var cgoEnabled = map[string]bool{
 	"dragonfly/amd64": true,
 	"freebsd/386":     true,
 	"freebsd/amd64":   true,
+	"freebsd/arm":     false,
 	"linux/386":       true,
 	"linux/amd64":     true,
 	"linux/arm":       true,
 	"linux/arm64":     true,
+	"linux/ppc64":     false,
 	"linux/ppc64le":   true,
+	"linux/mips64":    false,
+	"linux/mips64le":  false,
 	"android/386":     true,
 	"android/amd64":   true,
 	"android/arm":     true,
+	"android/arm64":   true,
+	"nacl/386":        false,
+	"nacl/amd64p32":   false,
+	"nacl/arm":        false,
 	"netbsd/386":      true,
 	"netbsd/amd64":    true,
 	"netbsd/arm":      true,
 	"openbsd/386":     true,
 	"openbsd/amd64":   true,
+	"openbsd/arm":     false,
+	"plan9/386":       false,
+	"plan9/amd64":     false,
+	"plan9/arm":       false,
 	"solaris/amd64":   true,
 	"windows/386":     true,
 	"windows/amd64":   true,
@@ -1128,7 +1150,7 @@ func defaulttarg() string {
 		fatal("current directory %s is not under %s", pwd, real_src)
 	}
 	pwd = pwd[len(real_src):]
-	// guard againt xrealwd return the directory without the trailing /
+	// guard against xrealwd returning the directory without the trailing /
 	pwd = strings.TrimPrefix(pwd, "/")
 
 	return pwd
@@ -1195,3 +1217,43 @@ func cmdversion() {
 	xflagparse(0)
 	xprintf("%s\n", findgoversion())
 }
+
+// cmdlist lists all supported platforms.
+func cmdlist() {
+	jsonFlag := flag.Bool("json", false, "produce JSON output")
+	xflagparse(0)
+
+	var plats []string
+	for p := range cgoEnabled {
+		plats = append(plats, p)
+	}
+	sort.Strings(plats)
+
+	if !*jsonFlag {
+		for _, p := range plats {
+			xprintf("%s\n", p)
+		}
+		return
+	}
+
+	type jsonResult struct {
+		GOOS         string
+		GOARCH       string
+		CgoSupported bool
+	}
+	var results []jsonResult
+	for _, p := range plats {
+		fields := strings.Split(p, "/")
+		results = append(results, jsonResult{
+			GOOS:         fields[0],
+			GOARCH:       fields[1],
+			CgoSupported: cgoEnabled[p]})
+	}
+	out, err := json.MarshalIndent(results, "", "\t")
+	if err != nil {
+		fatal("json marshal error: %v", err)
+	}
+	if _, err := os.Stdout.Write(out); err != nil {
+		fatal("write failed: %v", err)
+	}
+}

src/cmd/dist/buildgo.go

@@ -4,7 +4,10 @@
 
 package main
 
-import "fmt"
+import (
+	"bytes"
+	"fmt"
+)
 
 /*
  * Helpers for building cmd/go and cmd/cgo.
@@ -37,3 +40,28 @@ func mkzdefaultcc(dir, file string) {
 	file = file[:i] + "c" + file[i:]
 	writefile(out, file, writeSkipSame)
 }
+
+// mkzcgo writes zcgo.go for go/build package:
+//
+//	package build
+//  var cgoEnabled = map[string]bool{}
+//
+// It is invoked to write go/build/zcgo.go.
+func mkzcgo(dir, file string) {
+	var buf bytes.Buffer
+
+	fmt.Fprintf(&buf,
+		"// auto generated by go tool dist\n"+
+			"\n"+
+			"package build\n"+
+			"\n"+
+			"var cgoEnabled = map[string]bool{\n")
+	for plat, hasCgo := range cgoEnabled {
+		if hasCgo {
+			fmt.Fprintf(&buf, "\t%q: true,\n", plat)
+		}
+	}
+	fmt.Fprintf(&buf, "}")
+
+	writefile(buf.String(), file, writeSkipSame)
+}

src/cmd/dist/main.go

@@ -21,6 +21,7 @@ var cmdtab = []struct {
 	{"clean", cmdclean},
 	{"env", cmdenv},
 	{"install", cmdinstall},
+	{"list", cmdlist},
 	{"test", cmdtest},
 	{"version", cmdversion},
 }

src/cmd/dist/test.go

@@ -441,6 +441,20 @@ func (t *tester) registerTests() {
 				return nil
 			},
 		})
+		fortran := os.Getenv("FC")
+		if fortran == "" {
+			fortran, _ = exec.LookPath("gfortran")
+		}
+		if fortran != "" {
+			t.tests = append(t.tests, distTest{
+				name:    "cgo_fortran",
+				heading: "../misc/cgo/fortran",
+				fn: func(dt *distTest) error {
+					t.addCmd(dt, "misc/cgo/fortran", "./test.bash", fortran)
+					return nil
+				},
+			})
+		}
 	}
 	if t.cgoEnabled && t.goos != "android" && !t.iOS() {
 		// TODO(crawshaw): reenable on android and iOS

src/cmd/go/build.go

@@ -1348,6 +1348,11 @@ func (b *builder) build(a *action) (err error) {
 		return fmt.Errorf("can't build package %s because it contains Objective-C files (%s) but it's not using cgo nor SWIG",
 			a.p.ImportPath, strings.Join(a.p.MFiles, ","))
 	}
+	// Same as above for Fortran files
+	if len(a.p.FFiles) > 0 && !a.p.usesCgo() && !a.p.usesSwig() {
+		return fmt.Errorf("can't build package %s because it contains Fortran files (%s) but it's not using cgo nor SWIG",
+			a.p.ImportPath, strings.Join(a.p.FFiles, ","))
+	}
 	defer func() {
 		if err != nil && err != errPrintedOutput {
 			err = fmt.Errorf("go build %s: %v", a.p.ImportPath, err)
@@ -1437,7 +1442,7 @@ func (b *builder) build(a *action) (err error) {
 		if a.cgo != nil && a.cgo.target != "" {
 			cgoExe = a.cgo.target
 		}
-		outGo, outObj, err := b.cgo(a.p, cgoExe, obj, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, cxxfiles, a.p.MFiles)
+		outGo, outObj, err := b.cgo(a.p, cgoExe, obj, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, cxxfiles, a.p.MFiles, a.p.FFiles)
 		if err != nil {
 			return err
 		}
@@ -2272,7 +2277,7 @@ func (gcToolchain) gc(b *builder, p *Package, archive, obj string, asmhdr bool,
 	// so that it can give good error messages about forward declarations.
 	// Exceptions: a few standard packages have forward declarations for
 	// pieces supplied behind-the-scenes by package runtime.
-	extFiles := len(p.CgoFiles) + len(p.CFiles) + len(p.CXXFiles) + len(p.MFiles) + len(p.SFiles) + len(p.SysoFiles) + len(p.SwigFiles) + len(p.SwigCXXFiles)
+	extFiles := len(p.CgoFiles) + len(p.CFiles) + len(p.CXXFiles) + len(p.MFiles) + len(p.FFiles) + len(p.SFiles) + len(p.SysoFiles) + len(p.SwigFiles) + len(p.SwigCXXFiles)
 	if p.Standard {
 		switch p.ImportPath {
 		case "bytes", "net", "os", "runtime/pprof", "sync", "time":
@@ -2623,6 +2628,7 @@ func (tools gccgoToolchain) ld(b *builder, root *action, out string, allactions
 	usesCgo := false
 	cxx := len(root.p.CXXFiles) > 0 || len(root.p.SwigCXXFiles) > 0
 	objc := len(root.p.MFiles) > 0
+	fortran := len(root.p.FFiles) > 0
 
 	actionsSeen := make(map[*action]bool)
 	// Make a pre-order depth-first traversal of the action graph, taking note of
@@ -2697,6 +2703,9 @@ func (tools gccgoToolchain) ld(b *builder, root *action, out string, allactions
 		if len(a.p.MFiles) > 0 {
 			objc = true
 		}
+		if len(a.p.FFiles) > 0 {
+			fortran = true
+		}
 	}
 
 	ldflags = append(ldflags, "-Wl,--whole-archive")
@@ -2768,6 +2777,17 @@ func (tools gccgoToolchain) ld(b *builder, root *action, out string, allactions
 		if objc {
 			ldflags = append(ldflags, "-lobjc")
 		}
+		if fortran {
+			fc := os.Getenv("FC")
+			if fc == "" {
+				fc = "gfortran"
+			}
+			// support gfortran out of the box and let others pass the correct link options
+			// via CGO_LDFLAGS
+			if strings.Contains(fc, "gfortran") {
+				ldflags = append(ldflags, "-lgfortran")
+			}
+		}
 	}
 
 	if err := b.run(".", root.p.ImportPath, nil, tools.linker(), "-o", out, ofiles, ldflags, buildGccgoflags); err != nil {
@@ -2862,6 +2882,11 @@ func (b *builder) gxx(p *Package, out string, flags []string, cxxfile string) er
 	return b.ccompile(p, out, flags, cxxfile, b.gxxCmd(p.Dir))
 }
 
+// gfortran runs the gfortran Fortran compiler to create an object from a single Fortran file.
+func (b *builder) gfortran(p *Package, out string, flags []string, ffile string) error {
+	return b.ccompile(p, out, flags, ffile, b.gfortranCmd(p.Dir))
+}
+
 // ccompile runs the given C or C++ compiler and creates an object from a single source file.
 func (b *builder) ccompile(p *Package, out string, flags []string, file string, compiler []string) error {
 	file = mkAbs(p.Dir, file)
@@ -2891,6 +2916,11 @@ func (b *builder) gxxCmd(objdir string) []string {
 	return b.ccompilerCmd("CXX", defaultCXX, objdir)
 }
 
+// gfortranCmd returns a gfortran command line prefix.
+func (b *builder) gfortranCmd(objdir string) []string {
+	return b.ccompilerCmd("FC", "gfortran", objdir)
+}
+
 // ccompilerCmd returns a command line prefix for the given environment
 // variable and using the default command when the variable is empty.
 func (b *builder) ccompilerCmd(envvar, defcmd, objdir string) []string {
@@ -3009,8 +3039,8 @@ func envList(key, def string) []string {
 	return strings.Fields(v)
 }
 
-// Return the flags to use when invoking the C or C++ compilers, or cgo.
-func (b *builder) cflags(p *Package, def bool) (cppflags, cflags, cxxflags, ldflags []string) {
+// Return the flags to use when invoking the C, C++ or Fortran compilers, or cgo.
+func (b *builder) cflags(p *Package, def bool) (cppflags, cflags, cxxflags, fflags, ldflags []string) {
 	var defaults string
 	if def {
 		defaults = "-g -O2"
@@ -3019,15 +3049,16 @@ func (b *builder) cflags(p *Package, def bool) (cppflags, cflags, cxxflags, ldfl
 	cppflags = stringList(envList("CGO_CPPFLAGS", ""), p.CgoCPPFLAGS)
 	cflags = stringList(envList("CGO_CFLAGS", defaults), p.CgoCFLAGS)
 	cxxflags = stringList(envList("CGO_CXXFLAGS", defaults), p.CgoCXXFLAGS)
+	fflags = stringList(envList("CGO_FFLAGS", defaults), p.CgoFFLAGS)
 	ldflags = stringList(envList("CGO_LDFLAGS", defaults), p.CgoLDFLAGS)
 	return
 }
 
 var cgoRe = regexp.MustCompile(`[/\\:]`)
 
-func (b *builder) cgo(p *Package, cgoExe, obj string, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, gxxfiles, mfiles []string) (outGo, outObj []string, err error) {
-	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoLDFLAGS := b.cflags(p, true)
-	_, cgoexeCFLAGS, _, _ := b.cflags(p, false)
+func (b *builder) cgo(p *Package, cgoExe, obj string, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, gxxfiles, mfiles, ffiles []string) (outGo, outObj []string, err error) {
+	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoFFLAGS, cgoLDFLAGS := b.cflags(p, true)
+	_, cgoexeCFLAGS, _, _, _ := b.cflags(p, false)
 	cgoCPPFLAGS = append(cgoCPPFLAGS, pcCFLAGS...)
 	cgoLDFLAGS = append(cgoLDFLAGS, pcLDFLAGS...)
 	// If we are compiling Objective-C code, then we need to link against libobjc
@@ -3035,6 +3066,19 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, pcCFLAGS, pcLDFLAGS, cgofi
 		cgoLDFLAGS = append(cgoLDFLAGS, "-lobjc")
 	}
 
+	// Likewise for Fortran, except there are many Fortran compilers.
+	// Support gfortran out of the box and let others pass the correct link options
+	// via CGO_LDFLAGS
+	if len(ffiles) > 0 {
+		fc := os.Getenv("FC")
+		if fc == "" {
+			fc = "gfortran"
+		}
+		if strings.Contains(fc, "gfortran") {
+			cgoLDFLAGS = append(cgoLDFLAGS, "-lgfortran")
+		}
+	}
+
 	if buildMSan && p.ImportPath != "runtime/cgo" {
 		cgoCFLAGS = append([]string{"-fsanitize=memory"}, cgoCFLAGS...)
 		cgoLDFLAGS = append([]string{"-fsanitize=memory"}, cgoLDFLAGS...)
@@ -3202,6 +3246,17 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, pcCFLAGS, pcLDFLAGS, cgofi
 		outObj = append(outObj, ofile)
 	}
 
+	fflags := stringList(cgoCPPFLAGS, cgoFFLAGS)
+	for _, file := range ffiles {
+		// Append .o to the file, just in case the pkg has file.c and file.f
+		ofile := obj + cgoRe.ReplaceAllString(file, "_") + ".o"
+		if err := b.gfortran(p, ofile, fflags, file); err != nil {
+			return nil, nil, err
+		}
+		linkobj = append(linkobj, ofile)
+		outObj = append(outObj, ofile)
+	}
+
 	linkobj = append(linkobj, p.SysoFiles...)
 	dynobj := obj + "_cgo_.o"
 	pie := (goarch == "arm" && goos == "linux") || goos == "android"
@@ -3395,7 +3450,7 @@ func (b *builder) swigIntSize(obj string) (intsize string, err error) {
 
 // Run SWIG on one SWIG input file.
 func (b *builder) swigOne(p *Package, file, obj string, pcCFLAGS []string, cxx bool, intgosize string) (outGo, outC string, err error) {
-	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, _ := b.cflags(p, true)
+	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, _, _ := b.cflags(p, true)
 	var cflags []string
 	if cxx {
 		cflags = stringList(cgoCPPFLAGS, pcCFLAGS, cgoCXXFLAGS)

src/cmd/go/get.go

@@ -119,6 +119,14 @@ func runGet(cmd *Command, args []string) {
 		delete(packageCache, name)
 	}
 
+	// In order to rebuild packages information completely,
+	// we need to clear commands cache. Command packages are
+	// referring to evicted packages from the package cache.
+	// This leads to duplicated loads of the standard packages.
+	for name := range cmdCache {
+		delete(cmdCache, name)
+	}
+
 	args = importPaths(args)
 	packagesForBuild(args)
 

src/cmd/go/go_test.go

@@ -2122,7 +2122,7 @@ func TestIssue7108(t *testing.T) {
 // cmd/go: go test -a foo does not rebuild regexp.
 func TestIssue6844(t *testing.T) {
 	if testing.Short() {
-		t.Skip("don't rebuild the standard libary in short mode")
+		t.Skip("don't rebuild the standard library in short mode")
 	}
 
 	tg := testgo(t)
@@ -2763,6 +2763,10 @@ func TestCgoConsistentResults(t *testing.T) {
 	if !canCgo {
 		t.Skip("skipping because cgo not enabled")
 	}
+	if runtime.GOOS == "solaris" {
+		// See https://golang.org/issue/13247
+		t.Skip("skipping because Solaris builds are known to be inconsistent; see #13247")
+	}
 
 	tg := testgo(t)
 	defer tg.cleanup()
@@ -2785,3 +2789,15 @@ func TestCgoConsistentResults(t *testing.T) {
 		t.Error("building cgotest twice did not produce the same output")
 	}
 }
+
+// Issue 14444: go get -u .../ duplicate loads errors
+func TestGoGetUpdateAllDoesNotTryToLoadDuplicates(t *testing.T) {
+	testenv.MustHaveExternalNetwork(t)
+
+	tg := testgo(t)
+	defer tg.cleanup()
+	tg.makeTempdir()
+	tg.setenv("GOPATH", tg.path("."))
+	tg.run("get", "-u", ".../")
+	tg.grepStderrNot("duplicate loads of", "did not remove old packages from cache")
+}

src/cmd/go/list.go

@@ -51,6 +51,7 @@ syntax of package template.  The default output is equivalent to -f
         CXXFiles       []string // .cc, .cxx and .cpp source files
         MFiles         []string // .m source files
         HFiles         []string // .h, .hh, .hpp and .hxx source files
+        FFiles         []string // .f, .F, .for and .f90 Fortran source files
         SFiles         []string // .s source files
         SwigFiles      []string // .swig files
         SwigCXXFiles   []string // .swigcxx files
@@ -60,6 +61,7 @@ syntax of package template.  The default output is equivalent to -f
         CgoCFLAGS    []string // cgo: flags for C compiler
         CgoCPPFLAGS  []string // cgo: flags for C preprocessor
         CgoCXXFLAGS  []string // cgo: flags for C++ compiler
+        CgoFFLAGS    []string // cgo: flags for Fortran compiler
         CgoLDFLAGS   []string // cgo: flags for linker
         CgoPkgConfig []string // cgo: pkg-config names
 

src/cmd/go/pkg.go

@@ -50,6 +50,7 @@ type Package struct {
 	CXXFiles       []string `json:",omitempty"` // .cc, .cpp and .cxx source files
 	MFiles         []string `json:",omitempty"` // .m source files
 	HFiles         []string `json:",omitempty"` // .h, .hh, .hpp and .hxx source files
+	FFiles         []string `json:",omitempty"` // .f, .F, .for and .f90 Fortran source files
 	SFiles         []string `json:",omitempty"` // .s source files
 	SwigFiles      []string `json:",omitempty"` // .swig files
 	SwigCXXFiles   []string `json:",omitempty"` // .swigcxx files
@@ -59,6 +60,7 @@ type Package struct {
 	CgoCFLAGS    []string `json:",omitempty"` // cgo: flags for C compiler
 	CgoCPPFLAGS  []string `json:",omitempty"` // cgo: flags for C preprocessor
 	CgoCXXFLAGS  []string `json:",omitempty"` // cgo: flags for C++ compiler
+	CgoFFLAGS    []string `json:",omitempty"` // cgo: flags for Fortran compiler
 	CgoLDFLAGS   []string `json:",omitempty"` // cgo: flags for linker
 	CgoPkgConfig []string `json:",omitempty"` // cgo: pkg-config names
 
@@ -161,6 +163,7 @@ func (p *Package) copyBuild(pp *build.Package) {
 	p.CXXFiles = pp.CXXFiles
 	p.MFiles = pp.MFiles
 	p.HFiles = pp.HFiles
+	p.FFiles = pp.FFiles
 	p.SFiles = pp.SFiles
 	p.SwigFiles = pp.SwigFiles
 	p.SwigCXXFiles = pp.SwigCXXFiles
@@ -909,6 +912,7 @@ func (p *Package) load(stk *importStack, bp *build.Package, err error) *Package
 		p.CXXFiles,
 		p.MFiles,
 		p.HFiles,
+		p.FFiles,
 		p.SFiles,
 		p.SysoFiles,
 		p.SwigFiles,
@@ -1216,7 +1220,7 @@ var isGoRelease = strings.HasPrefix(runtime.Version(), "go1")
 // an explicit data comparison. Specifically, we build a list of the
 // inputs to the build, compute its SHA1 hash, and record that as the
 // ``build ID'' in the generated object. At the next build, we can
-// recompute the buid ID and compare it to the one in the generated
+// recompute the build ID and compare it to the one in the generated
 // object. If they differ, the list of inputs has changed, so the object
 // is out of date and must be rebuilt.
 //
@@ -1495,7 +1499,7 @@ func isStale(p *Package) bool {
 	// to test for write access, and then skip GOPATH roots we don't have write
 	// access to. But hopefully we can just use the mtimes always.
 
-	srcs := stringList(p.GoFiles, p.CFiles, p.CXXFiles, p.MFiles, p.HFiles, p.SFiles, p.CgoFiles, p.SysoFiles, p.SwigFiles, p.SwigCXXFiles)
+	srcs := stringList(p.GoFiles, p.CFiles, p.CXXFiles, p.MFiles, p.HFiles, p.FFiles, p.SFiles, p.CgoFiles, p.SysoFiles, p.SwigFiles, p.SwigCXXFiles)
 	for _, src := range srcs {
 		if olderThan(filepath.Join(p.Dir, src)) {
 			return true

src/cmd/go/test.go

@@ -1206,11 +1206,11 @@ func (b *builder) notest(a *action) error {
 	return nil
 }
 
-// isTestMain tells whether fn is a TestMain(m *testing.M) function.
-func isTestMain(fn *ast.FuncDecl) bool {
-	if fn.Name.String() != "TestMain" ||
-		fn.Type.Results != nil && len(fn.Type.Results.List) > 0 ||
-		fn.Type.Params == nil ||
+// isTestFunc tells whether fn has the type of a testing function. arg
+// specifies the parameter type we look for: B, M or T.
+func isTestFunc(fn *ast.FuncDecl, arg string) bool {
+	if fn.Type.Results != nil && len(fn.Type.Results.List) > 0 ||
+		fn.Type.Params.List == nil ||
 		len(fn.Type.Params.List) != 1 ||
 		len(fn.Type.Params.List[0].Names) > 1 {
 		return false
@@ -1222,10 +1222,11 @@ func isTestMain(fn *ast.FuncDecl) bool {
 	// We can't easily check that the type is *testing.M
 	// because we don't know how testing has been imported,
 	// but at least check that it's *M or *something.M.
-	if name, ok := ptr.X.(*ast.Ident); ok && name.Name == "M" {
+	// Same applies for B and T.
+	if name, ok := ptr.X.(*ast.Ident); ok && name.Name == arg {
 		return true
 	}
-	if sel, ok := ptr.X.(*ast.SelectorExpr); ok && sel.Sel.Name == "M" {
+	if sel, ok := ptr.X.(*ast.SelectorExpr); ok && sel.Sel.Name == arg {
 		return true
 	}
 	return false
@@ -1344,16 +1345,24 @@ func (t *testFuncs) load(filename, pkg string, doImport, seen *bool) error {
 		}
 		name := n.Name.String()
 		switch {
-		case isTestMain(n):
+		case name == "TestMain" && isTestFunc(n, "M"):
 			if t.TestMain != nil {
 				return errors.New("multiple definitions of TestMain")
 			}
 			t.TestMain = &testFunc{pkg, name, ""}
 			*doImport, *seen = true, true
 		case isTest(name, "Test"):
+			err := checkTestFunc(n, "T")
+			if err != nil {
+				return err
+			}
 			t.Tests = append(t.Tests, testFunc{pkg, name, ""})
 			*doImport, *seen = true, true
 		case isTest(name, "Benchmark"):
+			err := checkTestFunc(n, "B")
+			if err != nil {
+				return err
+			}
 			t.Benchmarks = append(t.Benchmarks, testFunc{pkg, name, ""})
 			*doImport, *seen = true, true
 		}
@@ -1372,6 +1381,15 @@ func (t *testFuncs) load(filename, pkg string, doImport, seen *bool) error {
 	return nil
 }
 
+func checkTestFunc(fn *ast.FuncDecl, arg string) error {
+	if !isTestFunc(fn, arg) {
+		name := fn.Name.String()
+		pos := testFileSet.Position(fn.Pos())
+		return fmt.Errorf("%s: wrong signature for %s, must be: func %s(%s *testing.%s)", pos, name, name, strings.ToLower(arg), arg)
+	}
+	return nil
+}
+
 type byOrder []*doc.Example
 
 func (x byOrder) Len() int           { return len(x) }

src/cmd/internal/goobj/read.go

@@ -530,7 +530,7 @@ func (r *objReader) parseArchive() error {
 			return errCorruptArchive
 		}
 		switch name {
-		case "__.SYMDEF", "__.GOSYMDEF", "__.PKGDEF":
+		case "__.PKGDEF":
 			r.skip(size)
 		default:
 			oldLimit := r.limit

src/cmd/internal/obj/arm/obj5.go

@@ -55,7 +55,7 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
 		}
 	}
 
-	// Replace TLS register fetches on older ARM procesors.
+	// Replace TLS register fetches on older ARM processors.
 	switch p.As {
 	// Treat MRC 15, 0, <reg>, C13, C0, 3 specially.
 	case AMRC:

src/cmd/internal/obj/link.go

@@ -444,6 +444,11 @@ const (
 	R_PLT1
 	R_PLT2
 	R_USEFIELD
+	// R_USETYPE resolves to an *rtype, but no relocation is created. The
+	// linker uses this as a signal that the pointed-to type information
+	// should be linked into the final binary, even if there are no other
+	// direct references. (This is used for types reachable by reflection.)
+	R_USETYPE
 	R_POWER_TOC
 	R_GOTPCREL
 	// R_JMPMIPS (only used on mips64) resolves to non-PC-relative target address
@@ -572,6 +577,7 @@ type Link struct {
 	Debugpcln          int32
 	Flag_shared        int32
 	Flag_dynlink       bool
+	Flag_optimize      bool
 	Bso                *Biobuf
 	Pathname           string
 	Windows            int32
@@ -617,6 +623,10 @@ type Link struct {
 	Data  *LSym
 	Etext *LSym
 	Edata *LSym
+
+	// Cache of Progs
+	allocIdx int
+	progs    [10000]Prog
 }
 
 func (ctxt *Link) Diag(format string, args ...interface{}) {

src/cmd/internal/obj/mips/obj0.go

@@ -1234,7 +1234,7 @@ func markregused(ctxt *obj.Link, s *Sch) {
 }
 
 /*
- * test to see if 2 instrictions can be
+ * test to see if two instructions can be
  * interchanged without changing semantics
  */
 func depend(ctxt *obj.Link, sa, sb *Sch) bool {

src/cmd/internal/obj/objfile.go

@@ -116,6 +116,12 @@ func Writeobjdirect(ctxt *Link, b *Biobuf) {
 }
 
 func Flushplist(ctxt *Link) {
+	flushplist(ctxt, ctxt.Debugasm == 0)
+}
+func FlushplistNoFree(ctxt *Link) {
+	flushplist(ctxt, false)
+}
+func flushplist(ctxt *Link, freeProgs bool) {
 	var flag int
 	var s *LSym
 	var p *Prog
@@ -295,21 +301,34 @@ func Flushplist(ctxt *Link) {
 	for s := text; s != nil; s = s.Next {
 		mkfwd(s)
 		linkpatch(ctxt, s)
+		if ctxt.Flag_optimize {
 			ctxt.Arch.Follow(ctxt, s)
+		}
 		ctxt.Arch.Preprocess(ctxt, s)
 		ctxt.Arch.Assemble(ctxt, s)
 		fieldtrack(ctxt, s)
 		linkpcln(ctxt, s)
+		if freeProgs {
+			s.Text = nil
+			s.Etext = nil
+		}
 	}
 
 	// Add to running list in ctxt.
-	if ctxt.Etext == nil {
+	if text != nil {
+		if ctxt.Text == nil {
 			ctxt.Text = text
 		} else {
 			ctxt.Etext.Next = text
 		}
 		ctxt.Etext = etext
+	}
 	ctxt.Plist = nil
+	ctxt.Plast = nil
+	ctxt.Curp = nil
+	if freeProgs {
+		ctxt.freeProgs()
+	}
 }
 
 func Writeobjfile(ctxt *Link, b *Biobuf) {

src/cmd/internal/obj/pass.go

@@ -202,6 +202,7 @@ func linkpatch(ctxt *Link, sym *LSym) {
 		p.Pcond = q
 	}
 
+	if ctxt.Flag_optimize {
 		for p := sym.Text; p != nil; p = p.Link {
 			if p.Pcond != nil {
 				p.Pcond = brloop(ctxt, p.Pcond)
@@ -213,3 +214,4 @@ func linkpatch(ctxt *Link, sym *LSym) {
 			}
 		}
 	}
+}

src/cmd/internal/obj/sym.go

@@ -110,6 +110,7 @@ func Linknew(arch *LinkArch) *Link {
 		ctxt.Goarm = Getgoarm()
 	}
 
+	ctxt.Flag_optimize = true
 	return ctxt
 }
 

src/cmd/internal/obj/util.go

@@ -287,6 +287,10 @@ func CConv(s uint8) string {
 }
 
 func (p *Prog) String() string {
+	if p == nil {
+		return "<nil Prog>"
+	}
+
 	if p.Ctxt == nil {
 		return "<Prog without ctxt>"
 	}
@@ -325,10 +329,23 @@ func (p *Prog) String() string {
 }
 
 func (ctxt *Link) NewProg() *Prog {
-	p := new(Prog) // should be the only call to this; all others should use ctxt.NewProg
+	var p *Prog
+	if i := ctxt.allocIdx; i < len(ctxt.progs) {
+		p = &ctxt.progs[i]
+		ctxt.allocIdx = i + 1
+	} else {
+		p = new(Prog) // should be the only call to this; all others should use ctxt.NewProg
+	}
 	p.Ctxt = ctxt
 	return p
 }
+func (ctxt *Link) freeProgs() {
+	s := ctxt.progs[:ctxt.allocIdx]
+	for i := range s {
+		s[i] = Prog{}
+	}
+	ctxt.allocIdx = 0
+}
 
 func (ctxt *Link) Line(n int) string {
 	return ctxt.LineHist.LineString(n)

src/cmd/internal/obj/x86/obj6.go

@@ -189,7 +189,7 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
 		}
 	}
 
-	// Rewrite 0 to $0 in 3rd argment to CMPPS etc.
+	// Rewrite 0 to $0 in 3rd argument to CMPPS etc.
 	// That's what the tables expect.
 	switch p.As {
 	case ACMPPD, ACMPPS, ACMPSD, ACMPSS:

src/cmd/link/internal/arm/asm.go

@@ -109,7 +109,7 @@ func gentext() {
 }
 
 // Preserve highest 8 bits of a, and do addition to lower 24-bit
-// of a and b; used to adjust ARM branch intruction's target
+// of a and b; used to adjust ARM branch instruction's target
 func braddoff(a int32, b int32) int32 {
 	return int32((uint32(a))&0xff000000 | 0x00ffffff&uint32(a+b))
 }

src/cmd/link/internal/arm/obj.go

@@ -156,7 +156,7 @@ func archinit() {
 		}
 
 	case obj.Hdarwin: /* apple MACH */
-		ld.Debug['w'] = 1 // disable DWARF generataion
+		ld.Debug['w'] = 1 // disable DWARF generation
 		ld.Machoinit()
 		ld.HEADR = ld.INITIAL_MACHO_HEADR
 		if ld.INITTEXT == -1 {

src/cmd/link/internal/arm64/asm.go

@@ -162,7 +162,7 @@ func machoreloc1(r *ld.Reloc, sectoff int64) int {
 	rs := r.Xsym
 
 	// ld64 has a bug handling MACHO_ARM64_RELOC_UNSIGNED with !extern relocation.
-	// see cmd/internal/ld/data.go for details. The workarond is that don't use !extern
+	// see cmd/internal/ld/data.go for details. The workaround is that don't use !extern
 	// UNSIGNED relocation at all.
 	if rs.Type == obj.SHOSTOBJ || r.Type == obj.R_CALLARM64 || r.Type == obj.R_ADDRARM64 || r.Type == obj.R_ADDR {
 		if rs.Dynid < 0 {

src/cmd/link/internal/ld/dwarf_defs.go

@@ -116,7 +116,7 @@ const (
 	DW_CHILDREN_yes = 0x01
 )
 
-// Not from the spec, but logicaly belongs here
+// Not from the spec, but logically belongs here
 const (
 	DW_CLS_ADDRESS = 0x01 + iota
 	DW_CLS_BLOCK

src/cmd/link/internal/ld/ldelf.go

@@ -1066,9 +1066,9 @@ func readelfsym(elfobj *ElfObj, i int, sym *ElfSym, needSym int) (err error) {
 			}
 
 			if needSym != 0 {
-				// local names and hidden visiblity global names are unique
-				// and should only reference by its index, not name, so we
-				// don't bother to add them into hash table
+				// local names and hidden global names are unique
+				// and should only be referenced by their index, not name, so we
+				// don't bother to add them into the hash table
 				s = linknewsym(Ctxt, sym.name, Ctxt.Version)
 
 				s.Type |= obj.SHIDDEN

src/cmd/link/internal/ld/lib.go

@@ -255,10 +255,7 @@ var coutbuf struct {
 	f *os.File
 }
 
-const (
-	symname = "__.GOSYMDEF"
-	pkgname = "__.PKGDEF"
-)
+const pkgname = "__.PKGDEF"
 
 var (
 	// Set if we see an object compiled by the host compiler that is not
@@ -781,7 +778,7 @@ func objfile(lib *Library) {
 		return
 	}
 
-	/* skip over optional __.GOSYMDEF and process __.PKGDEF */
+	/* process __.PKGDEF */
 	off := obj.Boffset(f)
 
 	var arhdr ArHdr
@@ -792,15 +789,6 @@ func objfile(lib *Library) {
 		goto out
 	}
 
-	if strings.HasPrefix(arhdr.name, symname) {
-		off += l
-		l = nextar(f, off, &arhdr)
-		if l <= 0 {
-			Diag("%s: short read on archive file symbol header", lib.File)
-			goto out
-		}
-	}
-
 	if !strings.HasPrefix(arhdr.name, pkgname) {
 		Diag("%s: cannot find package header", lib.File)
 		goto out
@@ -829,7 +817,7 @@ func objfile(lib *Library) {
 	 * the individual symbols that are unused.
 	 *
 	 * loading every object will also make it possible to
-	 * load foreign objects not referenced by __.GOSYMDEF.
+	 * load foreign objects not referenced by __.PKGDEF.
 	 */
 	for {
 		l = nextar(f, off, &arhdr)

src/cmd/link/internal/ld/macho.go

@@ -569,7 +569,7 @@ func Asmbmacho() {
 	if Linkmode == LinkInternal {
 		// For lldb, must say LC_VERSION_MIN_MACOSX or else
 		// it won't know that this Mach-O binary is from OS X
-		// (could be iOS or WatchOS intead).
+		// (could be iOS or WatchOS instead).
 		// Go on iOS uses linkmode=external, and linkmode=external
 		// adds this itself. So we only need this code for linkmode=internal
 		// and we can assume OS X.

src/cmd/pprof/internal/report/report.go

@@ -1340,7 +1340,7 @@ const (
 	addressOrder
 )
 
-// sort reoders the entries in a report based on the specified
+// sort reorders the entries in a report based on the specified
 // ordering criteria. The result is sorted in decreasing order for
 // numeric quantities, alphabetically for text, and increasing for
 // addresses.

src/cmd/pprof/internal/report/source.go

@@ -408,7 +408,7 @@ func getMissingFunctionSource(filename string, asm map[int]nodes, start, end int
 	return fnodes, filename
 }
 
-// adjustSourcePath adjusts the pathe for a source file by trimmming
+// adjustSourcePath adjusts the path for a source file by trimming
 // known prefixes and searching for the file on all parents of the
 // current working dir.
 func adjustSourcePath(path string) (*os.File, string, error) {

src/cmd/vet/doc.go

@@ -85,12 +85,12 @@ Flag: -copylocks
 
 Locks that are erroneously passed by value.
 
-Documentation examples
+Tests, benchmarks and documentation examples
 
-Flag: -example
+Flag: -tests
 
-Mistakes involving example tests, including examples with incorrect names or
-function signatures, or that document identifiers not in the package.
+Mistakes involving tests including functions with incorrect names or signatures
+and example tests that document identifiers not in the package.
 
 Methods
 

src/cmd/vet/example.go

@@ -1,124 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"go/ast"
-	"go/types"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-)
-
-func init() {
-	register("example",
-		"check for common mistaken usages of documentation examples",
-		checkExample,
-		funcDecl)
-}
-
-func isExampleSuffix(s string) bool {
-	r, size := utf8.DecodeRuneInString(s)
-	return size > 0 && unicode.IsLower(r)
-}
-
-// checkExample walks the documentation example functions checking for common
-// mistakes of misnamed functions, failure to map functions to existing
-// identifiers, etc.
-func checkExample(f *File, node ast.Node) {
-	if !strings.HasSuffix(f.name, "_test.go") {
-		return
-	}
-	var (
-		pkg     = f.pkg
-		pkgName = pkg.typesPkg.Name()
-		scopes  = []*types.Scope{pkg.typesPkg.Scope()}
-		lookup  = func(name string) types.Object {
-			for _, scope := range scopes {
-				if o := scope.Lookup(name); o != nil {
-					return o
-				}
-			}
-			return nil
-		}
-	)
-	if strings.HasSuffix(pkgName, "_test") {
-		// Treat 'package foo_test' as an alias for 'package foo'.
-		var (
-			basePkg = strings.TrimSuffix(pkgName, "_test")
-			pkg     = f.pkg
-		)
-		for _, p := range pkg.typesPkg.Imports() {
-			if p.Name() == basePkg {
-				scopes = append(scopes, p.Scope())
-				break
-			}
-		}
-	}
-	fn, ok := node.(*ast.FuncDecl)
-	if !ok {
-		// Ignore non-functions.
-		return
-	}
-	var (
-		fnName = fn.Name.Name
-		report = func(format string, args ...interface{}) { f.Badf(node.Pos(), format, args...) }
-	)
-	if fn.Recv != nil || !strings.HasPrefix(fnName, "Example") {
-		// Ignore methods and types not named "Example".
-		return
-	}
-	if params := fn.Type.Params; len(params.List) != 0 {
-		report("%s should be niladic", fnName)
-	}
-	if results := fn.Type.Results; results != nil && len(results.List) != 0 {
-		report("%s should return nothing", fnName)
-	}
-	if fnName == "Example" {
-		// Nothing more to do.
-		return
-	}
-	if filesRun && !includesNonTest {
-		// The coherence checks between a test and the package it tests
-		// will report false positives if no non-test files have
-		// been provided.
-		return
-	}
-	var (
-		exName = strings.TrimPrefix(fnName, "Example")
-		elems  = strings.SplitN(exName, "_", 3)
-		ident  = elems[0]
-		obj    = lookup(ident)
-	)
-	if ident != "" && obj == nil {
-		// Check ExampleFoo and ExampleBadFoo.
-		report("%s refers to unknown identifier: %s", fnName, ident)
-		// Abort since obj is absent and no subsequent checks can be performed.
-		return
-	}
-	if elemCnt := strings.Count(exName, "_"); elemCnt == 0 {
-		// Nothing more to do.
-		return
-	}
-	mmbr := elems[1]
-	if ident == "" {
-		// Check Example_suffix and Example_BadSuffix.
-		if residual := strings.TrimPrefix(exName, "_"); !isExampleSuffix(residual) {
-			report("%s has malformed example suffix: %s", fnName, residual)
-		}
-		return
-	}
-	if !isExampleSuffix(mmbr) {
-		// Check ExampleFoo_Method and ExampleFoo_BadMethod.
-		if obj, _, _ := types.LookupFieldOrMethod(obj.Type(), true, obj.Pkg(), mmbr); obj == nil {
-			report("%s refers to unknown field or method: %s.%s", fnName, ident, mmbr)
-		}
-	}
-	if len(elems) == 3 && !isExampleSuffix(elems[2]) {
-		// Check ExampleFoo_Method_suffix and ExampleFoo_Method_Badsuffix.
-		report("%s has malformed example suffix: %s", fnName, elems[2])
-	}
-	return
-}

src/cmd/vet/testdata/tests_test.go

@@ -1,7 +1,9 @@
-// Test of examples.
-
 package testdata
 
+import (
+	"testing"
+)
+
 // Buf is a ...
 type Buf []byte
 
@@ -46,3 +48,27 @@ func ExamplePuffer() // ERROR "ExamplePuffer refers to unknown identifier: Puffe
 func ExamplePuffer_Append() // ERROR "ExamplePuffer_Append refers to unknown identifier: Puffer"
 
 func ExamplePuffer_suffix() // ERROR "ExamplePuffer_suffix refers to unknown identifier: Puffer"
+
+func nonTest() {} // OK because it doesn't start with "Test".
+
+func (Buf) TesthasReceiver() {} // OK because it has a receiver.
+
+func TestOKSuffix(*testing.T) {} // OK because first char after "Test" is Uppercase.
+
+func TestÜnicodeWorks(*testing.T) {} // OK because the first char after "Test" is Uppercase.
+
+func TestbadSuffix(*testing.T) {} // ERROR "first letter after 'Test' must not be lowercase"
+
+func TestemptyImportBadSuffix(*T) {} // ERROR "first letter after 'Test' must not be lowercase"
+
+func Test(*testing.T) {} // OK "Test" on its own is considered a test.
+
+func Testify() {} // OK because it takes no parameters.
+
+func TesttooManyParams(*testing.T, string) {} // OK because it takes too many parameters.
+
+func TesttooManyNames(a, b *testing.T) {} // OK because it takes too many names.
+
+func TestnoTParam(string) {} // OK because it doesn't take a *testing.T
+
+func BenchmarkbadSuffix(*testing.B) {} // ERROR "first letter after 'Benchmark' must not be lowercase"

src/cmd/vet/tests.go

@@ -0,0 +1,182 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"go/ast"
+	"go/types"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+func init() {
+	register("tests",
+		"check for common mistaken usages of tests/documentation examples",
+		checkTestFunctions,
+		funcDecl)
+}
+
+func isExampleSuffix(s string) bool {
+	r, size := utf8.DecodeRuneInString(s)
+	return size > 0 && unicode.IsLower(r)
+}
+
+func isTestSuffix(name string) bool {
+	if len(name) == 0 {
+		// "Test" is ok.
+		return true
+	}
+	r, _ := utf8.DecodeRuneInString(name)
+	return !unicode.IsLower(r)
+}
+
+func isTestParam(typ ast.Expr, wantType string) bool {
+	ptr, ok := typ.(*ast.StarExpr)
+	if !ok {
+		// Not a pointer.
+		return false
+	}
+	// No easy way of making sure it's a *testing.T or *testing.B:
+	// ensure the name of the type matches.
+	if name, ok := ptr.X.(*ast.Ident); ok {
+		return name.Name == wantType
+	}
+	if sel, ok := ptr.X.(*ast.SelectorExpr); ok {
+		return sel.Sel.Name == wantType
+	}
+	return false
+}
+
+func lookup(name string, scopes []*types.Scope) types.Object {
+	for _, scope := range scopes {
+		if o := scope.Lookup(name); o != nil {
+			return o
+		}
+	}
+	return nil
+}
+
+func extendedScope(pkg *Package) []*types.Scope {
+	scopes := []*types.Scope{pkg.typesPkg.Scope()}
+
+	pkgName := pkg.typesPkg.Name()
+	if strings.HasPrefix(pkgName, "_test") {
+		basePkg := strings.TrimSuffix(pkgName, "_test")
+		for _, p := range pkg.typesPkg.Imports() {
+			if p.Name() == basePkg {
+				scopes = append(scopes, p.Scope())
+				break
+			}
+		}
+	}
+	return scopes
+}
+
+func checkExample(fn *ast.FuncDecl, pkg *Package, report reporter) {
+	fnName := fn.Name.Name
+	if params := fn.Type.Params; len(params.List) != 0 {
+		report("%s should be niladic", fnName)
+	}
+	if results := fn.Type.Results; results != nil && len(results.List) != 0 {
+		report("%s should return nothing", fnName)
+	}
+
+	if filesRun && !includesNonTest {
+		// The coherence checks between a test and the package it tests
+		// will report false positives if no non-test files have
+		// been provided.
+		return
+	}
+
+	if fnName == "Example" {
+		// Nothing more to do.
+		return
+	}
+
+	var (
+		exName = strings.TrimPrefix(fnName, "Example")
+		elems  = strings.SplitN(exName, "_", 3)
+		ident  = elems[0]
+		obj    = lookup(ident, extendedScope(pkg))
+	)
+	if ident != "" && obj == nil {
+		// Check ExampleFoo and ExampleBadFoo.
+		report("%s refers to unknown identifier: %s", fnName, ident)
+		// Abort since obj is absent and no subsequent checks can be performed.
+		return
+	}
+	if len(elems) < 2 {
+		// Nothing more to do.
+		return
+	}
+
+	if ident == "" {
+		// Check Example_suffix and Example_BadSuffix.
+		if residual := strings.TrimPrefix(exName, "_"); !isExampleSuffix(residual) {
+			report("%s has malformed example suffix: %s", fnName, residual)
+		}
+		return
+	}
+
+	mmbr := elems[1]
+	if !isExampleSuffix(mmbr) {
+		// Check ExampleFoo_Method and ExampleFoo_BadMethod.
+		if obj, _, _ := types.LookupFieldOrMethod(obj.Type(), true, obj.Pkg(), mmbr); obj == nil {
+			report("%s refers to unknown field or method: %s.%s", fnName, ident, mmbr)
+		}
+	}
+	if len(elems) == 3 && !isExampleSuffix(elems[2]) {
+		// Check ExampleFoo_Method_suffix and ExampleFoo_Method_Badsuffix.
+		report("%s has malformed example suffix: %s", fnName, elems[2])
+	}
+}
+
+func checkTest(fn *ast.FuncDecl, prefix string, report reporter) {
+	// Want functions with 0 results and 1 parameter.
+	if fn.Type.Results != nil && len(fn.Type.Results.List) > 0 ||
+		fn.Type.Params == nil ||
+		len(fn.Type.Params.List) != 1 ||
+		len(fn.Type.Params.List[0].Names) > 1 {
+		return
+	}
+
+	// The param must look like a *testing.T or *testing.B.
+	if !isTestParam(fn.Type.Params.List[0].Type, prefix[:1]) {
+		return
+	}
+
+	if !isTestSuffix(fn.Name.Name[len(prefix):]) {
+		report("%s has malformed name: first letter after '%s' must not be lowercase", fn.Name.Name, prefix)
+	}
+}
+
+type reporter func(format string, args ...interface{})
+
+// checkTestFunctions walks Test, Benchmark and Example functions checking
+// malformed names, wrong signatures and examples documenting inexistent
+// identifiers.
+func checkTestFunctions(f *File, node ast.Node) {
+	if !strings.HasSuffix(f.name, "_test.go") {
+		return
+	}
+
+	fn, ok := node.(*ast.FuncDecl)
+	if !ok || fn.Recv != nil {
+		// Ignore non-functions or functions with receivers.
+		return
+	}
+
+	report := func(format string, args ...interface{}) { f.Badf(node.Pos(), format, args...) }
+
+	switch {
+	case strings.HasPrefix(fn.Name.Name, "Example"):
+		checkExample(fn, f.pkg, report)
+	case strings.HasPrefix(fn.Name.Name, "Test"):
+		checkTest(fn, "Test", report)
+	case strings.HasPrefix(fn.Name.Name, "Benchmark"):
+		checkTest(fn, "Benchmark", report)
+	}
+}

src/crypto/ecdsa/ecdsa_test.go

@@ -130,7 +130,7 @@ func testNonceSafety(t *testing.T, c elliptic.Curve, tag string) {
 	}
 
 	if r0.Cmp(r1) == 0 {
-		t.Errorf("%s: the nonce used for two diferent messages was the same", tag)
+		t.Errorf("%s: the nonce used for two different messages was the same", tag)
 	}
 }
 

src/crypto/md5/md5block_arm.s

@@ -46,7 +46,7 @@ loop:
 	BEQ	aligned			// aligned detected - skip copy
 
 	// Copy the unaligned source data into the aligned temporary buffer
-	// memove(to=4(R13), from=8(R13), n=12(R13)) - Corrupts all registers
+	// memmove(to=4(R13), from=8(R13), n=12(R13)) - Corrupts all registers
 	MOVW	$buf, Rtable	// to
 	MOVW	$64, Rc0		// n
 	MOVM.IB	[Rtable,Rdata,Rc0], (R13)

src/crypto/rand/rand.go

@@ -11,8 +11,9 @@ import "io"
 // Reader is a global, shared instance of a cryptographically
 // strong pseudo-random generator.
 //
-// On Unix-like systems, Reader reads from /dev/urandom.
 // On Linux, Reader uses getrandom(2) if available, /dev/urandom otherwise.
+// On OpenBSD, Reader uses getentropy(2).
+// On other Unix-like systems, Reader reads from /dev/urandom.
 // On Windows systems, Reader uses the CryptGenRandom API.
 var Reader io.Reader