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Mangle C struct fields that happen to be named after Go keywords by prefixing them with _. Collisions with existing fields are resolved by prefixing the new Go identifier with _ until it matches nothing else in the struct.

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Fixes #36.

R=rsc
https://golang.org/cl/157061
This commit is contained in:
Eden Li 2009-11-18 09:59:10 -08:00 committed by Russ Cox
parent a274099340
commit 652bb7c2be
1 changed files with 30 additions and 1 deletions
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31
src/cmd/cgo/gcc.go
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@ -619,6 +619,34 @@ func (c *typeConv) Struct(dt *dwarf.StructType) (expr *ast.StructType, csyntax s
csyntax = "struct { "; csyntax = "struct { ";
fld := make([]*ast.Field, 0, 2*len(dt.Field)+1); // enough for padding around every field fld := make([]*ast.Field, 0, 2*len(dt.Field)+1); // enough for padding around every field
off := int64(0); off := int64(0);
// Mangle struct fields that happen to be named Go keywords into
// _{keyword}. Create a map from C ident -> Go ident. The Go ident will
// be mangled. Any existing identifier that already has the same name on
// the C-side will cause the Go-mangled version to be prefixed with _.
// (e.g. in a struct with fields '_type' and 'type', the latter would be
// rendered as '__type' in Go).
ident := make(map[string]string);
used := make(map[string]bool);
for _, f := range dt.Field {
ident[f.Name] = f.Name;
used[f.Name] = true;
}
for cid, goid := range ident {
if token.Lookup(strings.Bytes(goid)).IsKeyword() {
// Avoid keyword
goid = "_" + goid;
// Also avoid existing fields
for _, exist := used[goid]; exist; _, exist = used[goid] {
goid = "_" + goid
}
used[goid] = true;
ident[cid] = goid;
}
}
for _, f := range dt.Field { for _, f := range dt.Field {
if f.ByteOffset > off { if f.ByteOffset > off {
fld = c.pad(fld, f.ByteOffset-off); fld = c.pad(fld, f.ByteOffset-off);
@ -627,7 +655,8 @@ func (c *typeConv) Struct(dt *dwarf.StructType) (expr *ast.StructType, csyntax s
t := c.Type(f.Type); t := c.Type(f.Type);
n := len(fld); n := len(fld);
fld = fld[0 : n+1]; fld = fld[0 : n+1];
fld[n] = &ast.Field{Names: []*ast.Ident{c.Ident(f.Name)}, Type: t.Go};
fld[n] = &ast.Field{Names: []*ast.Ident{c.Ident(ident[f.Name])}, Type: t.Go};
off += t.Size; off += t.Size;
csyntax += t.C + " " + f.Name + "; "; csyntax += t.C + " " + f.Name + "; ";
if t.Align > align { if t.Align > align {