mirror of
https://github.com/golang/go
synced 2024-10-04 22:21:22 -06:00
1c72959999
parsing and printing to new syntax. Use -oldparser to parse the old syntax, use -oldprinter to print the old syntax. 2) Change default gofmt formatting settings to use tabs for indentation only and to use spaces for alignment. This will make the code alignment insensitive to an editor's tabwidth. Use -spaces=false to use tabs for alignment. 3) Manually changed src/exp/parser/parser_test.go so that it doesn't try to parse the parser's source files using the old syntax (they have new syntax now). 4) gofmt -w src misc test/bench 2nd set of files. R=rsc CC=golang-dev https://golang.org/cl/179067
82 lines
1.4 KiB
Go
82 lines
1.4 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 "os"
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/*
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* Virtual machine
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*/
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type Thread struct {
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abort chan os.Error
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pc uint
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// The execution frame of this function. This remains the
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// same throughout a function invocation.
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f *Frame
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}
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type code []func(*Thread)
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func (i code) exec(t *Thread) {
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opc := t.pc
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t.pc = 0
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l := uint(len(i))
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for t.pc < l {
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pc := t.pc
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t.pc++
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i[pc](t)
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}
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t.pc = opc
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}
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/*
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* Code buffer
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*/
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type codeBuf struct {
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instrs code
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}
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func newCodeBuf() *codeBuf { return &codeBuf{make(code, 0, 16)} }
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func (b *codeBuf) push(instr func(*Thread)) {
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n := len(b.instrs)
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if n >= cap(b.instrs) {
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a := make(code, n, n*2)
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for i := range b.instrs {
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a[i] = b.instrs[i]
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}
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b.instrs = a
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}
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b.instrs = b.instrs[0 : n+1]
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b.instrs[n] = instr
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}
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func (b *codeBuf) nextPC() uint { return uint(len(b.instrs)) }
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func (b *codeBuf) get() code {
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// Freeze this buffer into an array of exactly the right size
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a := make(code, len(b.instrs))
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for i := range b.instrs {
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a[i] = b.instrs[i]
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}
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return code(a)
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}
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/*
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* User-defined functions
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*/
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type evalFunc struct {
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outer *Frame
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frameSize int
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code code
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}
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func (f *evalFunc) NewFrame() *Frame { return f.outer.child(f.frameSize) }
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func (f *evalFunc) Call(t *Thread) { f.code.exec(t) }
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