[wasm] Allocate a single script per wasm module

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 335 matching lines @@
   const WasmFunction* function_;
   const WasmModule* module_;
   WasmFunctionName(const WasmFunction* function, const ModuleEnv* menv)
       : function_(function), module_(menv ? menv->module : nullptr) {}
 };
 
 std::ostream& operator<<(std::ostream& os, const WasmModule& module);
 std::ostream& operator<<(std::ostream& os, const WasmFunction& function);
 std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name);
 
-// Extract a function name from the given wasm object.
-// Returns "<WASM UNNAMED>" if the function is unnamed or the name is not a
-// valid UTF-8 string.
-Handle<String> GetWasmFunctionName(Isolate* isolate, Handle<Object> wasm,
+// Extract a function name from the given wasm instance.
+// Returns "<WASM UNNAMED>" if no instance is passed, the function is unnamed or
+// the name is not a valid UTF-8 string.
+// TODO(5620): Refactor once we always get a wasm instance.
+Handle<String> GetWasmFunctionName(Isolate* isolate, Handle<Object> instance,
                                    uint32_t func_index);
 
-// Extract a function name from the given wasm object.
-// Returns a null handle if the function is unnamed or the name is not a valid
-// UTF-8 string.
-Handle<Object> GetWasmFunctionNameOrNull(Isolate* isolate, Handle<Object> wasm,
-                                         uint32_t func_index);
-
 // Return the binary source bytes of a wasm module.
 Handle<SeqOneByteString> GetWasmBytes(Handle<JSObject> wasm);
 
 // Get the debug info associated with the given wasm object.
 // If no debug info exists yet, it is created automatically.
 Handle<WasmDebugInfo> GetDebugInfo(Handle<JSObject> wasm);
 
 // Return the number of functions in the given wasm object.
 int GetNumberOfFunctions(Handle<JSObject> wasm);
 
@@ skipping 10 matching lines @@
 // special marker as internal field, which will definitely never occur anywhere
 // else.
 bool IsWasmInstance(Object* instance);
 
 // Return the compiled module object for this WASM instance.
 WasmCompiledModule* GetCompiledModule(Object* wasm_instance);
 
 // Check whether the wasm module was generated from asm.js code.
 bool WasmIsAsmJs(Object* instance, Isolate* isolate);
 
-// Get the script for the asm.js origin of the wasm module.
-Handle<Script> GetAsmWasmScript(Handle<JSObject> instance);
+// Get the script of the wasm module. If the origin of the module is asm.js, the
+// returned Script will be a JavaScript Script of Script::TYPE_NORMAL, otherwise
+// it's of type TYPE_WASM.
+Handle<Script> GetScript(Handle<JSObject> instance);
 
 // Get the asm.js source position for the given byte offset in the given
 // function.
 int GetAsmWasmSourcePosition(Handle<JSObject> instance, int func_index,
                              int byte_offset);
 
 V8_EXPORT_PRIVATE MaybeHandle<WasmModuleObject> CreateModuleObjectFromBytes(
     Isolate* isolate, const byte* start, const byte* end, ErrorThrower* thrower,
     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> instance);
+// Get the offset of the code of a function within a module.
+int GetFunctionCodeOffset(Handle<WasmCompiledModule> compiled_module,
+                          int func_index);
+
+// Translate from byte offset in the module to function number and byte offset
+// within that function, encoded as line and column in the position info.
+bool GetPositionInfo(Handle<WasmCompiledModule> compiled_module,
+                     uint32_t position, Script::PositionInfo* info);
 
 // Assumed to be called with a code object associated to a wasm module instance.
 // Intended to be called from runtime functions.
 // Returns nullptr on failing to get owning instance.
 Object* GetOwningWasmInstance(Code* code);
 
 MaybeHandle<JSArrayBuffer> GetInstanceMemory(Isolate* isolate,
                                              Handle<JSObject> instance);
 
 int32_t GetInstanceMemorySize(Isolate* isolate, Handle<JSObject> instance);
@@ skipping 10 matching lines @@
                             int instance_count);
 void ValidateModuleState(Isolate* isolate, Handle<JSObject> wasm_module);
 void ValidateOrphanedInstance(Isolate* isolate, Handle<JSObject> instance);
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_