mirror of
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c0dd9f526b
In the process, I made error handling in the statement compiler much saner. Instead of separately tracking various error flags with weird relations, I just track if any error messages have been produced. R=rsc APPROVED=rsc DELTA=308 (98 added, 135 deleted, 75 changed) OCL=33870 CL=33961
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package eval
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import (
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"fmt";
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"go/ast";
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"go/scanner";
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"go/token";
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)
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type positioned interface {
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Pos() token.Position;
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}
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// A compiler captures information used throughout an entire
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// compilation. Currently it includes only the error handler.
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//
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// TODO(austin) This might actually represent package level, in which
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// case it should be package compiler.
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type compiler struct {
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errors scanner.ErrorHandler;
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numErrors int;
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silentErrors int;
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}
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func (a *compiler) diagAt(pos positioned, format string, args ...) {
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a.errors.Error(pos.Pos(), fmt.Sprintf(format, args));
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a.numErrors++;
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}
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func (a *compiler) numError() int {
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return a.numErrors + a.silentErrors;
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}
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// TODO(austin) These can all go in stmt.go now
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type label struct {
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name string;
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desc string;
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// The PC goto statements should jump to, or nil if this label
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// cannot be goto'd (such as an anonymous for loop label).
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gotoPC *uint;
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// The PC break statements should jump to, or nil if a break
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// statement is invalid.
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breakPC *uint;
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// The PC continue statements should jump to, or nil if a
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// continue statement is invalid.
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continuePC *uint;
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// The position where this label was resolved. If it has not
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// been resolved yet, an invalid position.
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resolved token.Position;
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// The position where this label was first jumped to.
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used token.Position;
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}
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// A funcCompiler captures information used throughout the compilation
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// of a single function body.
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type funcCompiler struct {
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*compiler;
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fnType *FuncType;
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// Whether the out variables are named. This affects what
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// kinds of return statements are legal.
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outVarsNamed bool;
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*codeBuf;
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flow *flowBuf;
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labels map[string] *label;
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}
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// A blockCompiler captures information used throughout the compilation
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// of a single block within a function.
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type blockCompiler struct {
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*funcCompiler;
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block *block;
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// The label of this block, used for finding break and
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// continue labels.
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label *label;
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// The blockCompiler for the block enclosing this one, or nil
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// for a function-level block.
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parent *blockCompiler;
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}
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