mirror of
https://github.com/golang/go
synced 2024-11-26 01:27:58 -07:00
da4a22993e
the interpreter and update code to use ast.BasicDecl and multi-type switch. There are still a lot of "switch _ := x.(type)" that should make use of the new type switch syntax, but those will be a different CL. R=rsc APPROVED=rsc DELTA=58 (16 added, 23 deleted, 19 changed) OCL=34853 CL=34963
98 lines
2.4 KiB
Go
98 lines
2.4 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/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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// The universal scope
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func newUniverse() *Scope {
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sc := &Scope{nil, 0};
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sc.block = &block{
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offset: 0,
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scope: sc,
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global: true,
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defs: make(map[string] Def)
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};
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return sc;
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}
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var universe *Scope = newUniverse();
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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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