Merge pull request #1181 from visualfc/trace

debug: fix print stack for wasm

Author: xushiwei

runtime/internal/clite/debug/_wrap/debug_wasm.c

@@ -0,0 +1,31 @@
+#ifdef __EMSCRIPTEN__
+//emscripten
+#include <emscripten.h>
+
+void llgo_print_stack(int skip) {
+  EM_ASM({
+    function getStackTrace() {
+      var stack;
+      try {
+        throw new Error();
+      } catch (e) {
+        stack = e.stack;
+      }
+      return stack;
+    }
+    
+    var stack = getStackTrace();
+    if (stack) {
+      var frames = stack.split('\n').slice($0);
+      frames.forEach(function(frame) {
+        console.log(frame.trim());
+      });
+    }
+  }, skip);
+}
+#else
+// wasi
+void llgo_print_stack(int skip){
+    
+}
+#endif

runtime/internal/clite/debug/debug.go

@@ -44,3 +44,12 @@ func StackTrace(skip int, fn func(fr *Frame) bool) {
 		return 1
 	})
 }
+
+func PrintStack(skip int) {
+	StackTrace(skip+1, func(fr *Frame) bool {
+		var info Info
+		Addrinfo(unsafe.Pointer(fr.PC), &info)
+		c.Fprintf(c.Stderr, c.Str("[0x%08X %s+0x%x, SP = 0x%x]\n"), fr.PC, fr.Name, fr.Offset, fr.SP)
+		return true
+	})
+}

runtime/internal/clite/debug/debug_wasm.go

@@ -6,6 +6,10 @@ import (
 	c "github.com/goplus/llgo/runtime/internal/clite"
 )
 
+const (
+	LLGoFiles = "_wrap/debug_wasm.c"
+)
+
 type Info struct {
 	Fname *c.Char
 	Fbase c.Pointer
@@ -31,3 +35,10 @@ type Frame struct {
 func StackTrace(skip int, fn func(fr *Frame) bool) {
 	panic("not implemented")
 }
+
+func PrintStack(skip int) {
+	print_stack(c.Int(skip + 4))
+}
+
+//go:linkname print_stack C.llgo_print_stack
+func print_stack(skip c.Int)

runtime/internal/runtime/z_rt.go

@@ -62,13 +62,7 @@ func Rethrow(link *Defer) {
 	if ptr := excepKey.Get(); ptr != nil {
 		if link == nil {
 			TracePanic(*(*any)(ptr))
-			debug.StackTrace(0, func(fr *debug.Frame) bool {
-				var info debug.Info
-				debug.Addrinfo(unsafe.Pointer(fr.PC), &info)
-				c.Fprintf(c.Stderr, c.Str("[0x%08X %s+0x%x, SP = 0x%x]\n"), fr.PC, fr.Name, fr.Offset, fr.SP)
-				return true
-			})
-
+			debug.PrintStack(2)
 			c.Free(ptr)
 			c.Exit(2)
 		} else {