mirror of
https://github.com/golang/go
synced 2024-10-01 13:18:33 -06:00
8cdf1f1cb1
Extracted Builder.findMethod function to handle
methodset/receiver logic common to
function calls (Builder.setCall) and
bound method closure creation (Builder.selector).
Capture: added explicit Name, Type fields to Capture instead
of relying on Outer field, which is now un-exported since its
only purpose is to let Builder.expr(case *ast.FuncLit) know
which values to put in the closure; it is nilled immediately
after.
Simplified Function.lookup() logic: there's no need to walk
the Outer chain each time to set Alloc.Heap=true, as it's
already set during creation of the outermost
Capture{outer:*Alloc}.
Added interp/testdata/boundmeth.go test.
Cosmetic changes:
- add support for bound method thunks to Function.FullName().
- Simplified {Literal,Global,Builtin,Function}.String()
- doc: Captures are no longer necessarily addresses.
- added yet another missing pair of "()" (go/types accessors).
- print "Synthetic" not "Declared at -" for synthetic functions.
- use '$' not center-dot in synthetic identifiers (easier to type).
R=gri
CC=golang-dev
https://golang.org/cl/9654043
103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package ssa_test
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import (
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"code.google.com/p/go.tools/ssa"
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"fmt"
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"go/ast"
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"go/parser"
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"os"
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)
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// This program demonstrates how to run the SSA builder on a "Hello,
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// World!" program and shows the printed representation of packages,
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// functions and instructions.
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//
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// Within the function listing, the name of each BasicBlock such as
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// ".0.entry" is printed left-aligned, followed by the block's
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// Instructions.
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//
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// For each instruction that defines an SSA virtual register
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// (i.e. implements Value), the type of that value is shown in the
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// right column.
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//
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// Build and run the ssadump.go program in this package if you want a
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// standalone tool with similar functionality.
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//
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func Example() {
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const hello = `
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package main
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import "fmt"
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const message = "Hello, World!"
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func main() {
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fmt.Println(message)
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}
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`
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// Construct a builder. Imports will be loaded as if by 'go build'.
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builder := ssa.NewBuilder(&ssa.Context{Loader: ssa.MakeGoBuildLoader(nil)})
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// Parse the input file.
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file, err := parser.ParseFile(builder.Prog.Files, "hello.go", hello, parser.DeclarationErrors)
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if err != nil {
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fmt.Printf(err.Error()) // parse error
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return
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}
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// Create a "main" package containing one file.
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mainPkg, err := builder.CreatePackage("main", []*ast.File{file})
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if err != nil {
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fmt.Printf(err.Error()) // type error
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return
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}
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// Print out the package.
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mainPkg.DumpTo(os.Stdout)
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fmt.Println()
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// Build SSA code for bodies of functions in mainPkg.
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builder.BuildPackage(mainPkg)
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// Print out the package-level functions.
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mainPkg.Init.DumpTo(os.Stdout)
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for _, mem := range mainPkg.Members {
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if fn, ok := mem.(*ssa.Function); ok {
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fn.DumpTo(os.Stdout)
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}
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}
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// Output:
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//
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// Package main:
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// var init$guard *bool
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// func main func()
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// const message message = "Hello, World!":untyped string
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//
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// # Name: main.init
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// # Synthetic
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// func init():
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// .0.entry: P:0 S:2
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// t0 = *init$guard bool
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// if t0 goto 2.init.done else 1.init.start
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// .1.init.start: P:1 S:1
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// *init$guard = true:bool
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// t1 = fmt.init() ()
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// jump 2.init.done
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// .2.init.done: P:2 S:0
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// ret
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//
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// # Name: main.main
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// # Declared at hello.go:8:6
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// func main():
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// .0.entry: P:0 S:0
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// a0 = new [1]interface{} *[1]interface{}
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// t0 = &a0[0:untyped integer] *interface{}
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// t1 = make interface interface{} <- string ("Hello, World!":string) interface{}
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// *t0 = t1
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// t2 = slice a0[:] []interface{}
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// t3 = fmt.Println(t2) (n int, err error)
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// ret
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}
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