[wasm] Disassemble wasm code from script

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index c65330c553e870fcaffdcb3611d0180484e041f3..3fb27093d39ce47d90b05be8538b371e6dd07116 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -14,6 +14,7 @@
 #include "src/interpreter/interpreter.h"
 #include "src/isolate-inl.h"
 #include "src/runtime/runtime.h"
+#include "src/wasm/wasm-debug.h"
 #include "src/wasm/wasm-module.h"
 
 namespace v8 {
@@ -1785,5 +1786,35 @@ RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
+
+RUNTIME_FUNCTION(Runtime_GetWasmFunctionOffsetTable) {

[ahaas, 2016/06/29 14:27:27]

I think this function should move to runtime-wasm.cc

[titzer, 2016/06/30 08:12:51]

Since these primarily have to do with debugging (as opposed to normal operation
of WASM), I'm OK keeping them here.

+  DCHECK(args.length() == 1);
+  HandleScope scope(isolate);
+  CONVERT_ARG_CHECKED(JSValue, script_val, 0);
+
+  RUNTIME_ASSERT(script_val->value()->IsScript());
+  Handle<Script> script = Handle<Script>(Script::cast(script_val->value()));
+
+  Handle<wasm::WasmDebugInfo> debug_info(
+      wasm::GetDebugInfo(script->wasm_object()), isolate);
+  Handle<FixedArray> elements = wasm::WasmDebugInfo::GetFunctionOffsetTable(
+      debug_info, script->wasm_function_index());
+  return *isolate->factory()->NewJSArrayWithElements(elements);
+}
+
+RUNTIME_FUNCTION(Runtime_DisassembleWasmFunction) {

[ahaas, 2016/06/29 14:27:27]

Same here.

+  DCHECK(args.length() == 1);
+  HandleScope scope(isolate);
+  CONVERT_ARG_CHECKED(JSValue, script_val, 0);
+
+  RUNTIME_ASSERT(script_val->value()->IsScript());
+  Handle<Script> script = Handle<Script>(Script::cast(script_val->value()));
+
+  Handle<wasm::WasmDebugInfo> debug_info(
+      wasm::GetDebugInfo(script->wasm_object()), isolate);
+  return *wasm::WasmDebugInfo::DisassembleFunction(
+      debug_info, script->wasm_function_index());
+}
+
 }  // namespace internal
 }  // namespace v8