cpp/llvm; os.Args; build: add llvm.BinDir to PATH

cpp/llvm/_demo/demangle/demangle.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/cpp/llvm"
+)
+
+func Demangle(mangledName string) *c.Char {
+	if ret := llvm.ItaniumDemangle(mangledName, true); ret != nil {
+		return ret
+	}
+	if ret := llvm.RustDemangle(mangledName); ret != nil {
+		return ret
+	}
+	return llvm.MicrosoftDemangle(mangledName, nil, nil, 0)
+}
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Fprintln(os.Stderr, "Usage: demangle symbol")
+		return
+	}
+	mangledName := os.Args[1]
+	if name := Demangle(mangledName); name != nil {
+		c.Printf(c.Str("%s\n"), name)
+		c.Free(unsafe.Pointer(name))
+	} else {
+		fmt.Fprintln(os.Stderr, "Failed to demangle")
+	}
+}