[wasm] prototype for breakpoint support.

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index d621e8b37e3afb6997aaed0b79fe03c502abc1e3..bd6b6ecd91e4244d64165199ea629282bc7d3074 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -292,6 +292,7 @@ bool LinkFunction(Handle<Code> unlinked,
   AllowDeferredHandleDereference embedding_raw_address;
   for (RelocIterator it(*unlinked, mode_mask); !it.done(); it.next()) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
+    DCHECK(RelocInfo::IsCodeTarget(mode));
     if (RelocInfo::IsCodeTarget(mode)) {
       Code* target =
           Code::GetCodeFromTargetAddress(it.rinfo()->target_address());
@@ -1018,10 +1019,10 @@ SeqOneByteString* GetWasmBytes(JSObject* wasm) {
   return SeqOneByteString::cast(wasm->GetInternalField(kWasmModuleBytesString));
 }
 
-WasmDebugInfo* GetDebugInfo(JSObject* wasm) {
+WasmDebugInfo* GetDebugInfo(Handle<JSObject> wasm) {
   Object* info = wasm->GetInternalField(kWasmDebugInfo);
   if (!info->IsUndefined(wasm->GetIsolate())) return WasmDebugInfo::cast(info);
-  Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(handle(wasm));
+  Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(wasm);
   wasm->SetInternalField(kWasmDebugInfo, *new_info);
   return *new_info;
 }
@@ -1032,6 +1033,20 @@ int GetNumberOfFunctions(JSObject* wasm) {
   return ByteArray::cast(func_names_obj)->get_int(0);
 }
 
+JSArrayBuffer* GetWasmMemoryBuffer(JSObject* wasm) {
+  DCHECK(IsWasmObject(wasm));
+  return JSArrayBuffer::cast(wasm->GetInternalField(kWasmMemArrayBuffer));
+}
+
+Code* GetWasmFunctionCode(JSObject* wasm, uint32_t func_index) {
+  FixedArray* code_table =
+      FixedArray::cast(wasm->GetInternalField(kWasmModuleCodeTable));
+  DCHECK_LE(func_index, static_cast<unsigned>(kMaxInt));
+  int func_index_int = static_cast<int>(func_index);
+  DCHECK_LE(func_index_int, code_table->length());
+  return Code::cast(code_table->get(func_index_int));
+}
+
 namespace testing {
 
 int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,