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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Cgo; see gmp.go for an overview.
// TODO(rsc):
// Emit correct line number annotations.
// Make 6g understand the annotations.
package main
import (
"flag";
"fmt";
"go/ast";
"os";
)
func usage() {
fmt.Fprint(os.Stderr, "usage: cgo file.cgo\n");
flag.PrintDefaults();
}
const ptrSize = 8 // TODO
func main() {
flag.Usage = usage;
flag.Parse();
args := flag.Args();
if len(args) != 1 {
usage();
os.Exit(2);
}
p := openProg(args[0]);
p.Preamble = p.Preamble + "\n" + builtinProlog;
p.loadDebugInfo(ptrSize);
p.Vardef = make(map[string]*Type);
p.Funcdef = make(map[string]*FuncType);
for _, cref := range p.Crefs {
switch cref.Context {
case "call":
if !cref.TypeName {
// Is an actual function call.
*cref.Expr = &ast.Ident{Value: "_C_" + cref.Name};
p.Funcdef[cref.Name] = cref.FuncType;
break;
}
*cref.Expr = cref.Type.Go;
case "expr":
if cref.TypeName {
error((*cref.Expr).Pos(), "type C.%s used as expression", cref.Name);
}
// Reference to C variable.
// We declare a pointer and arrange to have it filled in.
*cref.Expr = &ast.StarExpr{X: &ast.Ident{Value: "_C_" + cref.Name}};
p.Vardef[cref.Name] = cref.Type;
case "type":
if !cref.TypeName {
error((*cref.Expr).Pos(), "expression C.%s used as type", cref.Name);
}
*cref.Expr = cref.Type.Go;
}
}
if nerrors > 0 {
os.Exit(2);
}
p.PackagePath = p.Package;
p.writeOutput(args[0], "_cgo_go.go", "_cgo_c.c", "_cgo_gcc.c");
}
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