mirror of
https://github.com/golang/go
synced 2024-10-04 12:21:26 -06:00
36ca5fde68
Return checking is now done as a general flow check at the end of function compilation, since break and goto complicated the way I was doing return checking before. Goto-over-declaration checking is also done as a final flow check. Temporary variables used for effect extraction are now actually temporary. Otherwise "op=", "++", and "--" appear as declarations that cannot be jumped over. R=rsc APPROVED=rsc DELTA=421 (344 added, 38 deleted, 39 changed) OCL=32527 CL=32535
114 lines
3.3 KiB
Go
114 lines
3.3 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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"eval";
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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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}
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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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}
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type FuncDecl struct
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func (a *compiler) compileFunc(b *block, decl *FuncDecl, body *ast.BlockStmt) (func (f *Frame) Func)
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type exprCompiler struct
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func (a *compiler) compileExpr(b *block, expr ast.Expr, constant bool) *exprCompiler
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type assignCompiler struct
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func (a *compiler) checkAssign(pos token.Position, rs []*exprCompiler, errOp, errPosName string) (*assignCompiler, bool)
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func (a *compiler) compileAssign(pos token.Position, lt Type, rs []*exprCompiler, errOp, errPosName string) (func(lv Value, f *Frame))
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func (a *compiler) compileType(b *block, typ ast.Expr) Type
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func (a *compiler) compileFuncType(b *block, typ *ast.FuncType) *FuncDecl
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func (a *compiler) compileArrayLen(b *block, expr ast.Expr) (int64, bool)
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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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type codeBuf struct
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type flowBuf struct
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type FuncType struct
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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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err bool;
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}
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func (a *funcCompiler) checkLabels()
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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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func (a *blockCompiler) compileStmt(s ast.Stmt)
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func (a *blockCompiler) compileStmts(body *ast.BlockStmt)
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func (a *blockCompiler) enterChild() *blockCompiler
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func (a *blockCompiler) exit()
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// An exprContext stores information used throughout the compilation
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// of a single expression. It does not embed funcCompiler because
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// expressions can appear at top level.
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//
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// TODO(austin) Rename exprCompiler to exprNodeCompiler and rename
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// this to exprCompiler.
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type exprContext struct {
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*compiler;
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block *block;
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constant bool;
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}
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