mirror of
https://github.com/golang/go
synced 2024-10-05 06:11:21 -06:00
ba0e02b207
R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/5540048
816 lines
22 KiB
Go
816 lines
22 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 main
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import (
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"bytes"
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"debug/elf"
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"debug/macho"
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"debug/pe"
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"fmt"
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"go/ast"
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"go/printer"
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"go/token"
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"os"
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"strings"
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)
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// writeDefs creates output files to be compiled by 6g, 6c, and gcc.
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// (The comments here say 6g and 6c but the code applies to the 8 and 5 tools too.)
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func (p *Package) writeDefs() {
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fgo2 := creat(*objDir + "_cgo_gotypes.go")
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fc := creat(*objDir + "_cgo_defun.c")
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fm := creat(*objDir + "_cgo_main.c")
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fflg := creat(*objDir + "_cgo_flags")
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for k, v := range p.CgoFlags {
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fmt.Fprintf(fflg, "_CGO_%s=%s\n", k, v)
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}
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fflg.Close()
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// Write C main file for using gcc to resolve imports.
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fmt.Fprintf(fm, "int main() { return 0; }\n")
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if *importRuntimeCgo {
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fmt.Fprintf(fm, "void crosscall2(void(*fn)(void*, int), void *a, int c) { }\n")
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} else {
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// If we're not importing runtime/cgo, we *are* runtime/cgo,
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// which provides crosscall2. We just need a prototype.
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fmt.Fprintf(fm, "void crosscall2(void(*fn)(void*, int), void *a, int c);")
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}
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fmt.Fprintf(fm, "void _cgo_allocate(void *a, int c) { }\n")
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fmt.Fprintf(fm, "void _cgo_panic(void *a, int c) { }\n")
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// Write second Go output: definitions of _C_xxx.
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// In a separate file so that the import of "unsafe" does not
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// pollute the original file.
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fmt.Fprintf(fgo2, "// Created by cgo - DO NOT EDIT\n\n")
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fmt.Fprintf(fgo2, "package %s\n\n", p.PackageName)
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fmt.Fprintf(fgo2, "import \"unsafe\"\n\n")
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fmt.Fprintf(fgo2, "import \"syscall\"\n\n")
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if !*gccgo && *importRuntimeCgo {
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fmt.Fprintf(fgo2, "import _ \"runtime/cgo\"\n\n")
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}
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fmt.Fprintf(fgo2, "type _ unsafe.Pointer\n\n")
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fmt.Fprintf(fgo2, "func _Cerrno(dst *error, x int) { *dst = syscall.Errno(x) }\n")
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for name, def := range typedef {
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fmt.Fprintf(fgo2, "type %s ", name)
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printer.Fprint(fgo2, fset, def)
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fmt.Fprintf(fgo2, "\n\n")
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}
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fmt.Fprintf(fgo2, "type _Ctype_void [0]byte\n")
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if *gccgo {
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fmt.Fprintf(fc, cPrologGccgo)
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} else {
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fmt.Fprintf(fc, cProlog)
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}
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cVars := make(map[string]bool)
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for _, n := range p.Name {
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if n.Kind != "var" {
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continue
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}
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if !cVars[n.C] {
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fmt.Fprintf(fm, "extern char %s[];\n", n.C)
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fmt.Fprintf(fm, "void *_cgohack_%s = %s;\n\n", n.C, n.C)
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fmt.Fprintf(fc, "extern byte *%s;\n", n.C)
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cVars[n.C] = true
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}
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fmt.Fprintf(fc, "void *·%s = &%s;\n", n.Mangle, n.C)
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fmt.Fprintf(fc, "\n")
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fmt.Fprintf(fgo2, "var %s ", n.Mangle)
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printer.Fprint(fgo2, fset, &ast.StarExpr{X: n.Type.Go})
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fmt.Fprintf(fgo2, "\n")
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}
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fmt.Fprintf(fc, "\n")
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for _, n := range p.Name {
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if n.Const != "" {
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fmt.Fprintf(fgo2, "const _Cconst_%s = %s\n", n.Go, n.Const)
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}
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}
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fmt.Fprintf(fgo2, "\n")
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for _, n := range p.Name {
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if n.FuncType != nil {
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p.writeDefsFunc(fc, fgo2, n)
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}
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}
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p.writeExports(fgo2, fc, fm)
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fgo2.Close()
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fc.Close()
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}
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func dynimport(obj string) {
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stdout := os.Stdout
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if *dynout != "" {
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f, err := os.Create(*dynout)
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if err != nil {
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fatalf("%s", err)
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}
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stdout = f
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}
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if f, err := elf.Open(obj); err == nil {
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sym, err := f.ImportedSymbols()
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if err != nil {
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fatalf("cannot load imported symbols from ELF file %s: %v", obj, err)
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}
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for _, s := range sym {
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targ := s.Name
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if s.Version != "" {
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targ += "@" + s.Version
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}
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fmt.Fprintf(stdout, "#pragma dynimport %s %s %q\n", s.Name, targ, s.Library)
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}
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lib, err := f.ImportedLibraries()
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if err != nil {
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fatalf("cannot load imported libraries from ELF file %s: %v", obj, err)
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}
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for _, l := range lib {
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fmt.Fprintf(stdout, "#pragma dynimport _ _ %q\n", l)
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}
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return
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}
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if f, err := macho.Open(obj); err == nil {
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sym, err := f.ImportedSymbols()
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if err != nil {
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fatalf("cannot load imported symbols from Mach-O file %s: %v", obj, err)
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}
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for _, s := range sym {
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if len(s) > 0 && s[0] == '_' {
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s = s[1:]
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}
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fmt.Fprintf(stdout, "#pragma dynimport %s %s %q\n", s, s, "")
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}
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lib, err := f.ImportedLibraries()
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if err != nil {
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fatalf("cannot load imported libraries from Mach-O file %s: %v", obj, err)
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}
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for _, l := range lib {
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fmt.Fprintf(stdout, "#pragma dynimport _ _ %q\n", l)
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}
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return
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}
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if f, err := pe.Open(obj); err == nil {
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sym, err := f.ImportedSymbols()
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if err != nil {
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fatalf("cannot load imported symbols from PE file %s: %v", obj, err)
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}
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for _, s := range sym {
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ss := strings.Split(s, ":")
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fmt.Fprintf(stdout, "#pragma dynimport %s %s %q\n", ss[0], ss[0], strings.ToLower(ss[1]))
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}
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return
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}
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fatalf("cannot parse %s as ELF, Mach-O or PE", obj)
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}
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// Construct a gcc struct matching the 6c argument frame.
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// Assumes that in gcc, char is 1 byte, short 2 bytes, int 4 bytes, long long 8 bytes.
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// These assumptions are checked by the gccProlog.
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// Also assumes that 6c convention is to word-align the
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// input and output parameters.
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func (p *Package) structType(n *Name) (string, int64) {
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var buf bytes.Buffer
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fmt.Fprint(&buf, "struct {\n")
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off := int64(0)
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for i, t := range n.FuncType.Params {
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if off%t.Align != 0 {
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pad := t.Align - off%t.Align
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fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
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off += pad
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}
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fmt.Fprintf(&buf, "\t\t%s p%d;\n", t.C, i)
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off += t.Size
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}
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if off%p.PtrSize != 0 {
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pad := p.PtrSize - off%p.PtrSize
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fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
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off += pad
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}
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if t := n.FuncType.Result; t != nil {
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if off%t.Align != 0 {
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pad := t.Align - off%t.Align
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fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
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off += pad
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}
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qual := ""
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if c := t.C.String(); c[len(c)-1] == '*' {
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qual = "const "
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}
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fmt.Fprintf(&buf, "\t\t%s%s r;\n", qual, t.C)
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off += t.Size
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}
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if off%p.PtrSize != 0 {
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pad := p.PtrSize - off%p.PtrSize
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fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
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off += pad
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}
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if n.AddError {
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fmt.Fprint(&buf, "\t\tvoid *e[2]; /* error */\n")
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off += 2 * p.PtrSize
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}
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if off == 0 {
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fmt.Fprintf(&buf, "\t\tchar unused;\n") // avoid empty struct
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}
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fmt.Fprintf(&buf, "\t}")
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return buf.String(), off
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}
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func (p *Package) writeDefsFunc(fc, fgo2 *os.File, n *Name) {
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name := n.Go
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gtype := n.FuncType.Go
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if n.AddError {
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// Add "error" to return type list.
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// Type list is known to be 0 or 1 element - it's a C function.
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err := &ast.Field{Type: ast.NewIdent("error")}
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l := gtype.Results.List
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if len(l) == 0 {
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l = []*ast.Field{err}
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} else {
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l = []*ast.Field{l[0], err}
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}
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t := new(ast.FuncType)
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*t = *gtype
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t.Results = &ast.FieldList{List: l}
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gtype = t
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}
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// Go func declaration.
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d := &ast.FuncDecl{
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Name: ast.NewIdent(n.Mangle),
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Type: gtype,
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}
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printer.Fprint(fgo2, fset, d)
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if *gccgo {
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fmt.Fprintf(fgo2, " __asm__(\"%s\")\n", n.C)
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} else {
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fmt.Fprintf(fgo2, "\n")
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}
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if name == "CString" || name == "GoString" || name == "GoStringN" || name == "GoBytes" {
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// The builtins are already defined in the C prolog.
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return
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}
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// gccgo does not require a wrapper unless an error must be returned.
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if *gccgo && !n.AddError {
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return
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}
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var argSize int64
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_, argSize = p.structType(n)
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// C wrapper calls into gcc, passing a pointer to the argument frame.
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fmt.Fprintf(fc, "void _cgo%s%s(void*);\n", cPrefix, n.Mangle)
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fmt.Fprintf(fc, "\n")
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fmt.Fprintf(fc, "void\n")
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if argSize == 0 {
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argSize++
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}
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fmt.Fprintf(fc, "·%s(struct{uint8 x[%d];}p)\n", n.Mangle, argSize)
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fmt.Fprintf(fc, "{\n")
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fmt.Fprintf(fc, "\truntime·cgocall(_cgo%s%s, &p);\n", cPrefix, n.Mangle)
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if n.AddError {
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// gcc leaves errno in first word of interface at end of p.
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// check whether it is zero; if so, turn interface into nil.
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// if not, turn interface into errno.
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// Go init function initializes ·_Cerrno with an os.Errno
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// for us to copy.
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fmt.Fprintln(fc, ` {
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int32 e;
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void **v;
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v = (void**)(&p+1) - 2; /* v = final two void* of p */
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e = *(int32*)v;
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v[0] = (void*)0xdeadbeef;
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v[1] = (void*)0xdeadbeef;
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if(e == 0) {
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/* nil interface */
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v[0] = 0;
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v[1] = 0;
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} else {
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·_Cerrno(v, e); /* fill in v as error for errno e */
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}
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}`)
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}
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fmt.Fprintf(fc, "}\n")
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fmt.Fprintf(fc, "\n")
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}
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// writeOutput creates stubs for a specific source file to be compiled by 6g
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// (The comments here say 6g and 6c but the code applies to the 8 and 5 tools too.)
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func (p *Package) writeOutput(f *File, srcfile string) {
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base := srcfile
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if strings.HasSuffix(base, ".go") {
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base = base[0 : len(base)-3]
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}
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base = strings.Map(slashToUnderscore, base)
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fgo1 := creat(*objDir + base + ".cgo1.go")
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fgcc := creat(*objDir + base + ".cgo2.c")
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p.GoFiles = append(p.GoFiles, base+".cgo1.go")
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p.GccFiles = append(p.GccFiles, base+".cgo2.c")
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// Write Go output: Go input with rewrites of C.xxx to _C_xxx.
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fmt.Fprintf(fgo1, "// Created by cgo - DO NOT EDIT\n\n")
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fmt.Fprintf(fgo1, "//line %s:1\n", srcfile)
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printer.Fprint(fgo1, fset, f.AST)
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// While we process the vars and funcs, also write 6c and gcc output.
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// Gcc output starts with the preamble.
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fmt.Fprintf(fgcc, "%s\n", f.Preamble)
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fmt.Fprintf(fgcc, "%s\n", gccProlog)
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for _, n := range f.Name {
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if n.FuncType != nil {
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p.writeOutputFunc(fgcc, n)
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}
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}
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fgo1.Close()
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fgcc.Close()
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}
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func (p *Package) writeOutputFunc(fgcc *os.File, n *Name) {
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name := n.Mangle
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if name == "_Cfunc_CString" || name == "_Cfunc_GoString" || name == "_Cfunc_GoStringN" || name == "_Cfunc_GoBytes" || p.Written[name] {
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// The builtins are already defined in the C prolog, and we don't
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// want to duplicate function definitions we've already done.
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return
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}
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p.Written[name] = true
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ctype, _ := p.structType(n)
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// Gcc wrapper unpacks the C argument struct
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// and calls the actual C function.
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fmt.Fprintf(fgcc, "void\n")
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fmt.Fprintf(fgcc, "_cgo%s%s(void *v)\n", cPrefix, n.Mangle)
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fmt.Fprintf(fgcc, "{\n")
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if n.AddError {
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fmt.Fprintf(fgcc, "\tint e;\n") // assuming 32 bit (see comment above structType)
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fmt.Fprintf(fgcc, "\terrno = 0;\n")
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}
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// We're trying to write a gcc struct that matches 6c/8c/5c's layout.
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// Use packed attribute to force no padding in this struct in case
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// gcc has different packing requirements. For example,
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// on 386 Windows, gcc wants to 8-align int64s, but 8c does not.
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fmt.Fprintf(fgcc, "\t%s __attribute__((__packed__)) *a = v;\n", ctype)
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fmt.Fprintf(fgcc, "\t")
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if t := n.FuncType.Result; t != nil {
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fmt.Fprintf(fgcc, "a->r = ")
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if c := t.C.String(); c[len(c)-1] == '*' {
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fmt.Fprintf(fgcc, "(const %s) ", t.C)
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}
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}
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fmt.Fprintf(fgcc, "%s(", n.C)
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for i := range n.FuncType.Params {
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if i > 0 {
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fmt.Fprintf(fgcc, ", ")
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}
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fmt.Fprintf(fgcc, "a->p%d", i)
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}
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fmt.Fprintf(fgcc, ");\n")
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if n.AddError {
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fmt.Fprintf(fgcc, "\t*(int*)(a->e) = errno;\n")
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}
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fmt.Fprintf(fgcc, "}\n")
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fmt.Fprintf(fgcc, "\n")
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}
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// Write out the various stubs we need to support functions exported
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// from Go so that they are callable from C.
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func (p *Package) writeExports(fgo2, fc, fm *os.File) {
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fgcc := creat(*objDir + "_cgo_export.c")
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fgcch := creat(*objDir + "_cgo_export.h")
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fmt.Fprintf(fgcch, "/* Created by cgo - DO NOT EDIT. */\n")
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fmt.Fprintf(fgcch, "%s\n", gccExportHeaderProlog)
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fmt.Fprintf(fgcc, "/* Created by cgo - DO NOT EDIT. */\n")
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fmt.Fprintf(fgcc, "#include \"_cgo_export.h\"\n")
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for _, exp := range p.ExpFunc {
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fn := exp.Func
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// Construct a gcc struct matching the 6c argument and
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// result frame. The gcc struct will be compiled with
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// __attribute__((packed)) so all padding must be accounted
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// for explicitly.
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ctype := "struct {\n"
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off := int64(0)
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npad := 0
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if fn.Recv != nil {
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t := p.cgoType(fn.Recv.List[0].Type)
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ctype += fmt.Sprintf("\t\t%s recv;\n", t.C)
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off += t.Size
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}
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fntype := fn.Type
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forFieldList(fntype.Params,
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func(i int, atype ast.Expr) {
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t := p.cgoType(atype)
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if off%t.Align != 0 {
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pad := t.Align - off%t.Align
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ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
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off += pad
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npad++
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}
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ctype += fmt.Sprintf("\t\t%s p%d;\n", t.C, i)
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off += t.Size
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})
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if off%p.PtrSize != 0 {
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pad := p.PtrSize - off%p.PtrSize
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ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
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off += pad
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npad++
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}
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forFieldList(fntype.Results,
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func(i int, atype ast.Expr) {
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t := p.cgoType(atype)
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if off%t.Align != 0 {
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pad := t.Align - off%t.Align
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ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
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off += pad
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npad++
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}
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ctype += fmt.Sprintf("\t\t%s r%d;\n", t.C, i)
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off += t.Size
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})
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if off%p.PtrSize != 0 {
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pad := p.PtrSize - off%p.PtrSize
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ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
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off += pad
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npad++
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}
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if ctype == "struct {\n" {
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ctype += "\t\tchar unused;\n" // avoid empty struct
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}
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ctype += "\t}"
|
|
|
|
// Get the return type of the wrapper function
|
|
// compiled by gcc.
|
|
gccResult := ""
|
|
if fntype.Results == nil || len(fntype.Results.List) == 0 {
|
|
gccResult = "void"
|
|
} else if len(fntype.Results.List) == 1 && len(fntype.Results.List[0].Names) <= 1 {
|
|
gccResult = p.cgoType(fntype.Results.List[0].Type).C.String()
|
|
} else {
|
|
fmt.Fprintf(fgcch, "\n/* Return type for %s */\n", exp.ExpName)
|
|
fmt.Fprintf(fgcch, "struct %s_return {\n", exp.ExpName)
|
|
forFieldList(fntype.Results,
|
|
func(i int, atype ast.Expr) {
|
|
fmt.Fprintf(fgcch, "\t%s r%d;\n", p.cgoType(atype).C, i)
|
|
})
|
|
fmt.Fprintf(fgcch, "};\n")
|
|
gccResult = "struct " + exp.ExpName + "_return"
|
|
}
|
|
|
|
// Build the wrapper function compiled by gcc.
|
|
s := fmt.Sprintf("%s %s(", gccResult, exp.ExpName)
|
|
if fn.Recv != nil {
|
|
s += p.cgoType(fn.Recv.List[0].Type).C.String()
|
|
s += " recv"
|
|
}
|
|
forFieldList(fntype.Params,
|
|
func(i int, atype ast.Expr) {
|
|
if i > 0 || fn.Recv != nil {
|
|
s += ", "
|
|
}
|
|
s += fmt.Sprintf("%s p%d", p.cgoType(atype).C, i)
|
|
})
|
|
s += ")"
|
|
fmt.Fprintf(fgcch, "\nextern %s;\n", s)
|
|
|
|
fmt.Fprintf(fgcc, "extern _cgoexp%s_%s(void *, int);\n", cPrefix, exp.ExpName)
|
|
fmt.Fprintf(fgcc, "\n%s\n", s)
|
|
fmt.Fprintf(fgcc, "{\n")
|
|
fmt.Fprintf(fgcc, "\t%s __attribute__((packed)) a;\n", ctype)
|
|
if gccResult != "void" && (len(fntype.Results.List) > 1 || len(fntype.Results.List[0].Names) > 1) {
|
|
fmt.Fprintf(fgcc, "\t%s r;\n", gccResult)
|
|
}
|
|
if fn.Recv != nil {
|
|
fmt.Fprintf(fgcc, "\ta.recv = recv;\n")
|
|
}
|
|
forFieldList(fntype.Params,
|
|
func(i int, atype ast.Expr) {
|
|
fmt.Fprintf(fgcc, "\ta.p%d = p%d;\n", i, i)
|
|
})
|
|
fmt.Fprintf(fgcc, "\tcrosscall2(_cgoexp%s_%s, &a, %d);\n", cPrefix, exp.ExpName, off)
|
|
if gccResult != "void" {
|
|
if len(fntype.Results.List) == 1 && len(fntype.Results.List[0].Names) <= 1 {
|
|
fmt.Fprintf(fgcc, "\treturn a.r0;\n")
|
|
} else {
|
|
forFieldList(fntype.Results,
|
|
func(i int, atype ast.Expr) {
|
|
fmt.Fprintf(fgcc, "\tr.r%d = a.r%d;\n", i, i)
|
|
})
|
|
fmt.Fprintf(fgcc, "\treturn r;\n")
|
|
}
|
|
}
|
|
fmt.Fprintf(fgcc, "}\n")
|
|
|
|
// Build the wrapper function compiled by 6c/8c
|
|
goname := exp.Func.Name.Name
|
|
if fn.Recv != nil {
|
|
goname = "_cgoexpwrap" + cPrefix + "_" + fn.Recv.List[0].Names[0].Name + "_" + goname
|
|
}
|
|
fmt.Fprintf(fc, "#pragma dynexport %s %s\n", goname, goname)
|
|
fmt.Fprintf(fc, "extern void ·%s();\n", goname)
|
|
fmt.Fprintf(fc, "\nvoid\n")
|
|
fmt.Fprintf(fc, "_cgoexp%s_%s(void *a, int32 n)\n", cPrefix, exp.ExpName)
|
|
fmt.Fprintf(fc, "{\n")
|
|
fmt.Fprintf(fc, "\truntime·cgocallback(·%s, a, n);\n", goname)
|
|
fmt.Fprintf(fc, "}\n")
|
|
|
|
fmt.Fprintf(fm, "int _cgoexp%s_%s;\n", cPrefix, exp.ExpName)
|
|
|
|
// Calling a function with a receiver from C requires
|
|
// a Go wrapper function.
|
|
if fn.Recv != nil {
|
|
fmt.Fprintf(fgo2, "func %s(recv ", goname)
|
|
printer.Fprint(fgo2, fset, fn.Recv.List[0].Type)
|
|
forFieldList(fntype.Params,
|
|
func(i int, atype ast.Expr) {
|
|
fmt.Fprintf(fgo2, ", p%d ", i)
|
|
printer.Fprint(fgo2, fset, atype)
|
|
})
|
|
fmt.Fprintf(fgo2, ")")
|
|
if gccResult != "void" {
|
|
fmt.Fprint(fgo2, " (")
|
|
forFieldList(fntype.Results,
|
|
func(i int, atype ast.Expr) {
|
|
if i > 0 {
|
|
fmt.Fprint(fgo2, ", ")
|
|
}
|
|
printer.Fprint(fgo2, fset, atype)
|
|
})
|
|
fmt.Fprint(fgo2, ")")
|
|
}
|
|
fmt.Fprint(fgo2, " {\n")
|
|
fmt.Fprint(fgo2, "\t")
|
|
if gccResult != "void" {
|
|
fmt.Fprint(fgo2, "return ")
|
|
}
|
|
fmt.Fprintf(fgo2, "recv.%s(", exp.Func.Name)
|
|
forFieldList(fntype.Params,
|
|
func(i int, atype ast.Expr) {
|
|
if i > 0 {
|
|
fmt.Fprint(fgo2, ", ")
|
|
}
|
|
fmt.Fprintf(fgo2, "p%d", i)
|
|
})
|
|
fmt.Fprint(fgo2, ")\n")
|
|
fmt.Fprint(fgo2, "}\n")
|
|
}
|
|
}
|
|
}
|
|
|
|
// Call a function for each entry in an ast.FieldList, passing the
|
|
// index into the list and the type.
|
|
func forFieldList(fl *ast.FieldList, fn func(int, ast.Expr)) {
|
|
if fl == nil {
|
|
return
|
|
}
|
|
i := 0
|
|
for _, r := range fl.List {
|
|
if r.Names == nil {
|
|
fn(i, r.Type)
|
|
i++
|
|
} else {
|
|
for _ = range r.Names {
|
|
fn(i, r.Type)
|
|
i++
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func c(repr string, args ...interface{}) *TypeRepr {
|
|
return &TypeRepr{repr, args}
|
|
}
|
|
|
|
// Map predeclared Go types to Type.
|
|
var goTypes = map[string]*Type{
|
|
"bool": {Size: 1, Align: 1, C: c("uchar")},
|
|
"byte": {Size: 1, Align: 1, C: c("uchar")},
|
|
"int": {Size: 4, Align: 4, C: c("int")},
|
|
"uint": {Size: 4, Align: 4, C: c("uint")},
|
|
"rune": {Size: 4, Align: 4, C: c("int")},
|
|
"int8": {Size: 1, Align: 1, C: c("schar")},
|
|
"uint8": {Size: 1, Align: 1, C: c("uchar")},
|
|
"int16": {Size: 2, Align: 2, C: c("short")},
|
|
"uint16": {Size: 2, Align: 2, C: c("ushort")},
|
|
"int32": {Size: 4, Align: 4, C: c("int")},
|
|
"uint32": {Size: 4, Align: 4, C: c("uint")},
|
|
"int64": {Size: 8, Align: 8, C: c("int64")},
|
|
"uint64": {Size: 8, Align: 8, C: c("uint64")},
|
|
"float": {Size: 4, Align: 4, C: c("float")},
|
|
"float32": {Size: 4, Align: 4, C: c("float")},
|
|
"float64": {Size: 8, Align: 8, C: c("double")},
|
|
"complex": {Size: 8, Align: 8, C: c("__complex float")},
|
|
"complex64": {Size: 8, Align: 8, C: c("__complex float")},
|
|
"complex128": {Size: 16, Align: 16, C: c("__complex double")},
|
|
}
|
|
|
|
// Map an ast type to a Type.
|
|
func (p *Package) cgoType(e ast.Expr) *Type {
|
|
switch t := e.(type) {
|
|
case *ast.StarExpr:
|
|
x := p.cgoType(t.X)
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("%s*", x.C)}
|
|
case *ast.ArrayType:
|
|
if t.Len == nil {
|
|
return &Type{Size: p.PtrSize + 8, Align: p.PtrSize, C: c("GoSlice")}
|
|
}
|
|
case *ast.StructType:
|
|
// TODO
|
|
case *ast.FuncType:
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("void*")}
|
|
case *ast.InterfaceType:
|
|
return &Type{Size: 2 * p.PtrSize, Align: p.PtrSize, C: c("GoInterface")}
|
|
case *ast.MapType:
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("GoMap")}
|
|
case *ast.ChanType:
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("GoChan")}
|
|
case *ast.Ident:
|
|
// Look up the type in the top level declarations.
|
|
// TODO: Handle types defined within a function.
|
|
for _, d := range p.Decl {
|
|
gd, ok := d.(*ast.GenDecl)
|
|
if !ok || gd.Tok != token.TYPE {
|
|
continue
|
|
}
|
|
for _, spec := range gd.Specs {
|
|
ts, ok := spec.(*ast.TypeSpec)
|
|
if !ok {
|
|
continue
|
|
}
|
|
if ts.Name.Name == t.Name {
|
|
return p.cgoType(ts.Type)
|
|
}
|
|
}
|
|
}
|
|
for name, def := range typedef {
|
|
if name == t.Name {
|
|
return p.cgoType(def)
|
|
}
|
|
}
|
|
if t.Name == "uintptr" {
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("uintptr")}
|
|
}
|
|
if t.Name == "string" {
|
|
return &Type{Size: p.PtrSize + 4, Align: p.PtrSize, C: c("GoString")}
|
|
}
|
|
if t.Name == "error" {
|
|
return &Type{Size: 2 * p.PtrSize, Align: p.PtrSize, C: c("GoInterface")}
|
|
}
|
|
if r, ok := goTypes[t.Name]; ok {
|
|
if r.Align > p.PtrSize {
|
|
r.Align = p.PtrSize
|
|
}
|
|
return r
|
|
}
|
|
error_(e.Pos(), "unrecognized Go type %s", t.Name)
|
|
return &Type{Size: 4, Align: 4, C: c("int")}
|
|
case *ast.SelectorExpr:
|
|
id, ok := t.X.(*ast.Ident)
|
|
if ok && id.Name == "unsafe" && t.Sel.Name == "Pointer" {
|
|
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: c("void*")}
|
|
}
|
|
}
|
|
error_(e.Pos(), "unrecognized Go type %T", e)
|
|
return &Type{Size: 4, Align: 4, C: c("int")}
|
|
}
|
|
|
|
const gccProlog = `
|
|
// Usual nonsense: if x and y are not equal, the type will be invalid
|
|
// (have a negative array count) and an inscrutable error will come
|
|
// out of the compiler and hopefully mention "name".
|
|
#define __cgo_compile_assert_eq(x, y, name) typedef char name[(x-y)*(x-y)*-2+1];
|
|
|
|
// Check at compile time that the sizes we use match our expectations.
|
|
#define __cgo_size_assert(t, n) __cgo_compile_assert_eq(sizeof(t), n, _cgo_sizeof_##t##_is_not_##n)
|
|
|
|
__cgo_size_assert(char, 1)
|
|
__cgo_size_assert(short, 2)
|
|
__cgo_size_assert(int, 4)
|
|
typedef long long __cgo_long_long;
|
|
__cgo_size_assert(__cgo_long_long, 8)
|
|
__cgo_size_assert(float, 4)
|
|
__cgo_size_assert(double, 8)
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
`
|
|
|
|
const builtinProlog = `
|
|
typedef struct { char *p; int n; } _GoString_;
|
|
typedef struct { char *p; int n; int c; } _GoBytes_;
|
|
_GoString_ GoString(char *p);
|
|
_GoString_ GoStringN(char *p, int l);
|
|
_GoBytes_ GoBytes(void *p, int n);
|
|
char *CString(_GoString_);
|
|
`
|
|
|
|
const cProlog = `
|
|
#include "runtime.h"
|
|
#include "cgocall.h"
|
|
|
|
void ·_Cerrno(void*, int32);
|
|
|
|
void
|
|
·_Cfunc_GoString(int8 *p, String s)
|
|
{
|
|
s = runtime·gostring((byte*)p);
|
|
FLUSH(&s);
|
|
}
|
|
|
|
void
|
|
·_Cfunc_GoStringN(int8 *p, int32 l, String s)
|
|
{
|
|
s = runtime·gostringn((byte*)p, l);
|
|
FLUSH(&s);
|
|
}
|
|
|
|
void
|
|
·_Cfunc_GoBytes(int8 *p, int32 l, Slice s)
|
|
{
|
|
s = runtime·gobytes((byte*)p, l);
|
|
FLUSH(&s);
|
|
}
|
|
|
|
void
|
|
·_Cfunc_CString(String s, int8 *p)
|
|
{
|
|
p = runtime·cmalloc(s.len+1);
|
|
runtime·memmove((byte*)p, s.str, s.len);
|
|
p[s.len] = 0;
|
|
FLUSH(&p);
|
|
}
|
|
`
|
|
|
|
const cPrologGccgo = `
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
struct __go_string {
|
|
const unsigned char *__data;
|
|
int __length;
|
|
};
|
|
|
|
typedef struct __go_open_array {
|
|
void* __values;
|
|
int __count;
|
|
int __capacity;
|
|
} Slice;
|
|
|
|
struct __go_string __go_byte_array_to_string(const void* p, int len);
|
|
struct __go_open_array __go_string_to_byte_array (struct __go_string str);
|
|
|
|
const char *CString(struct __go_string s) {
|
|
return strndup(s.__data, s.__length);
|
|
}
|
|
|
|
struct __go_string GoString(char *p) {
|
|
return __go_byte_array_to_string(p, strlen(p));
|
|
}
|
|
|
|
struct __go_string GoStringN(char *p, int n) {
|
|
return __go_byte_array_to_string(p, n);
|
|
}
|
|
|
|
Slice GoBytes(char *p, int n) {
|
|
struct __go_string s = { p, n };
|
|
return __go_string_to_byte_array(s);
|
|
}
|
|
`
|
|
|
|
const gccExportHeaderProlog = `
|
|
typedef unsigned int uint;
|
|
typedef signed char schar;
|
|
typedef unsigned char uchar;
|
|
typedef unsigned short ushort;
|
|
typedef long long int64;
|
|
typedef unsigned long long uint64;
|
|
typedef __SIZE_TYPE__ uintptr;
|
|
|
|
typedef struct { char *p; int n; } GoString;
|
|
typedef void *GoMap;
|
|
typedef void *GoChan;
|
|
typedef struct { void *t; void *v; } GoInterface;
|
|
`
|