c/debug: func addr and info

c/debug/_demo/funcinfo/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/debug"
+)
+
+type T struct {
+	n int
+}
+
+func (t *T) Demo() {
+	println(t.n)
+	addr := debug.Address()
+	c.Printf(c.Str("addr:0x%x\n"), addr)
+	var info debug.Info
+	r := debug.Addrinfo(addr, &info)
+	if r == 0 {
+		panic("not found info")
+	}
+	c.Printf(c.Str("func file:%s name:%s base:0x%x addr:0x%x\n"), info.Fname, info.Sname, info.Fbase, info.Saddr)
+}
+
+func main() {
+	t := &T{100}
+	t.Demo()
+}

c/debug/_wrap/debug.c

@@ -0,0 +1,14 @@
+#if defined(__linux__)
+#define _GNU_SOURCE
+#include <features.h>
+#endif
+
+#include <dlfcn.h>
+
+void *llgo_address() {
+    return __builtin_return_address(0);
+}
+
+int llgo_addrinfo(void *addr, Dl_info *info) {
+    return dladdr(addr, info);
+}

c/debug/debug.go

@@ -0,0 +1,25 @@
+package debug
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+)
+
+const (
+	LLGoPackage = "link"
+	LLGoFiles   = "_wrap/debug.c"
+)
+
+type Info struct {
+	Fname *c.Char
+	Fbase c.Pointer
+	Sname *c.Char
+	Saddr c.Pointer
+}
+
+//go:linkname Address C.llgo_address
+func Address() unsafe.Pointer
+
+//go:linkname Addrinfo C.llgo_addrinfo
+func Addrinfo(addr unsafe.Pointer, info *Info) c.Int

internal/build/build.go

@@ -393,6 +393,7 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 			"-lm",
 			"-latomic",
 			"-lpthread", // libpthread is built-in since glibc 2.34 (2021-08-01); we need to support earlier versions.
+			"-rdynamic", // support addrinfo
 		)
 	}
 	needRuntime := false