[wasm] Provide better stack traces for asm.js code

src/wasm/wasm-module.h

 // 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.
 
 #ifndef V8_WASM_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 376 matching lines @@
 
 #define CORE_WCM_PROPERTY_TABLE(MACRO)                \
   MACRO(OBJECT, FixedArray, code_table)               \
   MACRO(OBJECT, FixedArray, imports)                  \
   MACRO(OBJECT, FixedArray, exports)                  \
   MACRO(OBJECT, FixedArray, inits)                    \
   MACRO(OBJECT, FixedArray, startup_function)         \
   MACRO(OBJECT, FixedArray, indirect_function_tables) \
   MACRO(OBJECT, SeqOneByteString, module_bytes)       \
   MACRO(OBJECT, ByteArray, function_names)            \
+  MACRO(OBJECT, Script, asm_js_script)                \
+  MACRO(OBJECT, ByteArray, asm_js_offset_tables)      \
   MACRO(SMALL_NUMBER, uint32_t, min_memory_pages)     \
   MACRO(OBJECT, FixedArray, data_segments_info)       \
   MACRO(OBJECT, ByteArray, data_segments)             \
   MACRO(SMALL_NUMBER, uint32_t, globals_size)         \
   MACRO(OBJECT, JSArrayBuffer, heap)                  \
   MACRO(SMALL_NUMBER, ModuleOrigin, origin)           \
   MACRO(WEAK_LINK, WasmCompiledModule, next_instance) \
   MACRO(WEAK_LINK, WasmCompiledModule, prev_instance) \
   MACRO(WEAK_LINK, JSObject, owning_instance)         \
   MACRO(WEAK_LINK, JSObject, module_object)
@@ skipping 85 matching lines @@
                                               MaybeHandle<ByteArray> signature,
                                               Handle<JSObject> module_instance);
 
 // Check whether the given object is a wasm object.
 // This checks the number and type of internal fields, so it's not 100 percent
 // secure. If it turns out that we need more complete checks, we could add a
 // special marker as internal field, which will definitely never occur anywhere
 // else.
 bool IsWasmObject(Object* object);
 
+// Return the compiled module object for this wasm object.
+WasmCompiledModule* GetCompiledModule(JSObject* wasm);
+
+// Check whether the wasm module was generated from asm.js code.
+bool WasmIsAsmJs(Object* wasm, Isolate* isolate);
+
+// Get the script for the asm.js origin of the wasm module.
+Handle<Script> GetAsmWasmScript(Handle<JSObject> wasm);
+
+// Get the asm.js source position for the given byte offset in the given
+// function.
+int GetAsmWasmSourcePosition(Handle<JSObject> wasm, int func_index,
+                             int byte_offset);
+
 // Update memory references of code objects associated with the module
 bool UpdateWasmModuleMemory(Handle<JSObject> object, Address old_start,
                             Address new_start, uint32_t old_size,
                             uint32_t new_size);
 
 // Constructs a single function table as a FixedArray of double size,
 // populating it with function signature indices and function indices.
 Handle<FixedArray> BuildFunctionTable(Isolate* isolate, uint32_t index,
                                       const WasmModule* module);
 
 // Populates a function table by replacing function indices with handles to
 // the compiled code.
 void PopulateFunctionTable(Handle<FixedArray> table, uint32_t table_size,
                            const std::vector<Handle<Code>>* code_table);
 
 Handle<JSObject> CreateCompiledModuleObject(
     Isolate* isolate, Handle<WasmCompiledModule> compiled_module,
     ModuleOrigin origin);
 
 V8_EXPORT_PRIVATE MaybeHandle<JSObject> CreateModuleObjectFromBytes(
     Isolate* isolate, const byte* start, const byte* end, ErrorThrower* thrower,
-    ModuleOrigin origin);
+    ModuleOrigin origin, Handle<Script> asm_js_script,
+    const byte* asm_offset_tables_start, const byte* asm_offset_tables_end);
 
 V8_EXPORT_PRIVATE bool ValidateModuleBytes(Isolate* isolate, const byte* start,
                                            const byte* end,
                                            ErrorThrower* thrower,
                                            ModuleOrigin origin);
 
 // Get the number of imported functions for a WASM instance.
 int GetNumImportedFunctions(Handle<JSObject> wasm_object);
 
 // Assumed to be called with a code object associated to a wasm module instance.
@@ skipping 12 matching lines @@
                             int instance_count);
 void ValidateModuleState(Isolate* isolate, Handle<JSObject> module_obj);
 void ValidateOrphanedInstance(Isolate* isolate, Handle<JSObject> instance);
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_