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cmd/compile: add ideal int constants to dwarf

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The core dump reader would like a bunch of ideal int
constants to be available in dwarf.

Makes the go binary 0.9% bigger.

Update #14517

Change-Id: I00cdfc7f53bcdc56fccba576c1d33010f03bdd95
Reviewed-on: https://go-review.googlesource.com/69270
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Keith Randall 2017-10-09 10:08:54 -07:00 committed by Keith Randall
parent 4a2376ef02
commit 7830a19a4f
2 changed files with 16 additions and 4 deletions
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17
src/cmd/compile/internal/gc/obj.go
View File

@ -219,14 +219,15 @@ func dumpGlobal(n *Node) {
func dumpGlobalConst(n *Node) {
// only export typed constants
if n.Type == nil {
t := n.Type
if t == nil {
return
}
if n.Sym.Pkg != localpkg {
return
}
// only export integer constants for now
switch n.Type.Etype {
switch t.Etype {
case TINT8:
case TINT16:
case TINT32:
@ -239,10 +240,20 @@ func dumpGlobalConst(n *Node) {
case TUINT:
case TUINTPTR:
// ok
case TIDEAL:
if !Isconst(n, CTINT) {
return
}
x := n.Val().U.(*Mpint)
if x.Cmp(minintval[TINT]) < 0 || x.Cmp(maxintval[TINT]) > 0 {
return
}
// Ideal integers we export as int (if they fit).
t = types.Types[TINT]
default:
return
}
Ctxt.DwarfIntConst(myimportpath, n.Sym.Name, typesymname(n.Type), n.Int64())
Ctxt.DwarfIntConst(myimportpath, n.Sym.Name, typesymname(t), n.Int64())
}
func dumpglobls() {

3
src/runtime/runtime-gdb_test.go
View File

@ -427,6 +427,7 @@ func TestGdbConst(t *testing.T) {
"-ex", "print main.largeConstant",
"-ex", "print main.minusOne",
"-ex", "print 'runtime._MSpanInUse'",
"-ex", "print 'runtime._PageSize'",
filepath.Join(dir, "a.exe"),
}
got, _ := exec.Command("gdb", args...).CombinedOutput()
@ -435,7 +436,7 @@ func TestGdbConst(t *testing.T) {
t.Logf("output %q", sgot)
if !strings.Contains(sgot, "\n$1 = 42\n$2 = 18446744073709551615\n$3 = -1\n$4 = 1 '\\001'") {
if !strings.Contains(sgot, "\n$1 = 42\n$2 = 18446744073709551615\n$3 = -1\n$4 = 1 '\\001'\n$5 = 8192") {
t.Fatalf("output mismatch")
}
}