[wasm] prototype for breakpoint support.

src/wasm/wasm-module.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/atomic-utils.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 #include "src/property-descriptor.h"
 #include "src/v8.h"
 
@@ skipping 274 matching lines @@
 }
 
 bool LinkFunction(Handle<Code> unlinked,
                   const std::vector<Handle<Code>>& code_targets,
                   Code::Kind kind) {
   bool modified = false;
   int mode_mask = RelocInfo::kCodeTargetMask;
   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());
       if (target->kind() == kind &&
           target->constant_pool_offset() >= kPlaceholderMarker) {
         // Patch direct calls to placeholder code objects.
         uint32_t index = target->constant_pool_offset() - kPlaceholderMarker;
         CHECK(index < code_targets.size());
         Handle<Code> new_target = code_targets[index];
         if (target != *new_target) {
@@ skipping 706 matching lines @@
   if (memcmp(bytes->GetChars(), "\0asm", 4)) return false;
 
   // All checks passed.
   return true;
 }
 
 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;
 }
 
 int GetNumberOfFunctions(JSObject* wasm) {
   Object* func_names_obj = wasm->GetInternalField(kWasmFunctionNamesArray);
   // TODO(clemensh): this looks inside an array constructed elsewhere. Refactor.
   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,
                                 const byte* module_end, bool asm_js) {
   HandleScope scope(isolate);
   Zone zone(isolate->allocator());
   ErrorThrower thrower(isolate, "CompileAndRunWasmModule");
 
   // Decode the module, but don't verify function bodies, since we'll
   // be compiling them anyway.
@@ skipping 53 matching lines @@
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower.Error("WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8