[PATCH] [llgo] irgen: introduce ManglePackagePath function

[Peter Collingbourne]

Hi axw,

This is useful for clients that need to use llgo's mangling of the package
path to look up a specific function within a given package.

http://reviews.llvm.org/D6801

Files:
  irgen/typemap.go

Index: irgen/typemap.go
===================================================================
--- irgen/typemap.go
+++ irgen/typemap.go
@@ -487,19 +487,19 @@
 	b.WriteRune('e')
 }
 
-func (ctx *manglerContext) manglePackagePath(pkgpath string, b *bytes.Buffer) {
+func ManglePackagePath(pkgpath string) string {
 	pkgpath = strings.Replace(pkgpath, "/", "_", -1)
 	pkgpath = strings.Replace(pkgpath, ".", "_", -1)
-	b.WriteString(pkgpath)
+	return pkgpath
 }
 
 func (ctx *manglerContext) mangleType(t types.Type, b *bytes.Buffer) {
 	switch t := t.(type) {
 	case *types.Basic, *types.Named:
 		var nb bytes.Buffer
 		ti := ctx.getNamedTypeInfo(t)
 		if ti.pkgpath != "" {
-			ctx.manglePackagePath(ti.pkgpath, &nb)
+			nb.WriteString(ManglePackagePath(ti.pkgpath))
 			nb.WriteRune('.')
 		}
 		if ti.functionName != "" {
@@ -602,7 +602,7 @@
 		b.WriteString("__go_tdn_")
 		ti := ctx.getNamedTypeInfo(t)
 		if ti.pkgpath != "" {
-			ctx.manglePackagePath(ti.pkgpath, b)
+			b.WriteString(ManglePackagePath(ti.pkgpath))
 			b.WriteRune('.')
 		}
 		if ti.functionName != "" {
@@ -674,7 +674,7 @@
 	}
 
 	if pkg != nil {
-		ctx.manglePackagePath(pkg.Path(), &b)
+		b.WriteString(ManglePackagePath(pkg.Path()))
 		b.WriteRune('.')
 	}
 
@@ -694,7 +694,7 @@
 func (ctx *manglerContext) mangleGlobalName(g *ssa.Global) string {
 	var b bytes.Buffer
 
-	ctx.manglePackagePath(g.Pkg.Object.Path(), &b)
+	b.WriteString(ManglePackagePath(g.Pkg.Object.Path()))
 	b.WriteRune('.')
 	b.WriteString(g.Name())
 
@@ -814,7 +814,7 @@
 		ti := tm.mc.getNamedTypeInfo(t)
 		if ti.pkgpath != "" {
 			b.WriteByte('\t')
-			tm.mc.manglePackagePath(ti.pkgpath, b)
+			b.WriteString(ManglePackagePath(ti.pkgpath))
 			b.WriteByte('\t')
 			b.WriteString(ti.pkgname)
 			b.WriteByte('.')

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