[wasm] Allocate a single script per wasm module

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index a9d61fd71fead418ee80aef288cd2f5ee6f0a718..388a7ee832ddec92a232e62fc20e85e5d2d7563a 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -400,11 +400,13 @@ class WasmCompiledModule : public FixedArray {
 #define CORE_WCM_PROPERTY_TABLE(MACRO)                \
   MACRO(OBJECT, FixedArray, code_table)               \
   MACRO(OBJECT, Foreign, module_wrapper)              \
+  /* For debugging: */                                \
   MACRO(OBJECT, SeqOneByteString, module_bytes)       \
-  MACRO(OBJECT, Script, asm_js_script)                \
+  MACRO(OBJECT, Script, script)                       \
+  MACRO(OBJECT, ByteArray, asm_js_offset_tables)      \
+  /* End of debugging stuff. */                       \
   MACRO(OBJECT, FixedArray, function_tables)          \
   MACRO(OBJECT, FixedArray, empty_function_tables)    \
-  MACRO(OBJECT, ByteArray, asm_js_offset_tables)      \
   MACRO(OBJECT, JSArrayBuffer, memory)                \
   MACRO(SMALL_NUMBER, uint32_t, min_mem_pages)        \
   MACRO(SMALL_NUMBER, uint32_t, max_mem_pages)        \
@@ -455,6 +457,10 @@ class WasmCompiledModule : public FixedArray {
     return min_mem_pages() * WasmModule::kPageSize;
   }
 
+  WasmModule* cpp_module() const {
+    return Handle<WasmModuleWrapper>::cast(module_wrapper())->get();
+  }
+
 #define DECLARATION(KIND, TYPE, NAME) WCM_##KIND(TYPE, NAME)
   WCM_PROPERTY_TABLE(DECLARATION)
 #undef DECLARATION
@@ -472,17 +478,20 @@ class WasmCompiledModule : public FixedArray {
   DISALLOW_IMPLICIT_CONSTRUCTORS(WasmCompiledModule);
 };
 
-// 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 compiled wasm module.
+// Returns "<WASM UNNAMED>" if no compiled module is passed, the function is
+// unnamed or the name is not a valid UTF-8 string.
+// TODO(5620): Fix interface once we always get a compiled module.
+Handle<String> GetWasmFunctionName(Isolate* isolate,
+                                   Handle<Object> compiled_module_or_undef,
                                    uint32_t func_index);
 
-// Extract a function name from the given wasm object.
+// Extract a function name from the given compiled wasm module.
 // 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);
+Handle<Object> GetWasmFunctionNameOrNull(
+    Isolate* isolate, Handle<WasmCompiledModule> compiled_module,
+    uint32_t func_index);
 
 // Return the binary source bytes of a wasm module.
 Handle<SeqOneByteString> GetWasmBytes(Handle<JSObject> wasm);
@@ -514,8 +523,10 @@ 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.
@@ -546,8 +557,14 @@ V8_EXPORT_PRIVATE bool ValidateModuleBytes(Isolate* isolate, const byte* start,
                                            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.