[wasm cleanup] Use const in more places

Bug: v8:7109
Change-Id: Ia29472641c9906433749d55269e15a32c8984355
Reviewed-on: https://chromium-review.googlesource.com/804213Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Eric Holk <eholk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49806}

src/wasm/wasm-module.cc

@@ -109,8 +109,8 @@ void UnpackAndRegisterProtectedInstructionsGC(Isolate* isolate,
   }
 }
 
-void UnpackAndRegisterProtectedInstructions(Isolate* isolate,
-                                            wasm::NativeModule* native_module) {
+void UnpackAndRegisterProtectedInstructions(
+    Isolate* isolate, const wasm::NativeModule* native_module) {
   DisallowHeapAllocation no_gc;
 
   for (uint32_t i = native_module->num_imported_functions(),
@@ -171,7 +171,7 @@ WasmFunction* GetWasmFunctionForExport(Isolate* isolate,
 }
 
 void UpdateDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
-                          int index, WasmFunction* function,
+                          int index, const WasmFunction* function,
                           Handle<Object> code_or_foreign) {
   DCHECK_EQ(0, dispatch_tables->length() % 4);
   for (int i = 0; i < dispatch_tables->length(); i += 4) {

src/wasm/wasm-module.h

@@ -247,7 +247,7 @@ struct WasmFunctionName {
       : function_(function), name_(name) {}
 
   const WasmFunction* function_;
-  WasmName name_;
+  const WasmName name_;
 };
 
 std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name);
@@ -285,14 +285,14 @@ Handle<FixedArray> DecodeLocalNames(Isolate*, Handle<WasmCompiledModule>);
 WasmFunction* GetWasmFunctionForExport(Isolate* isolate, Handle<Object> target);
 
 void UpdateDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
-                          int index, WasmFunction* function,
+                          int index, const WasmFunction* function,
                           Handle<Object> code_or_foreign);
 
 void UnpackAndRegisterProtectedInstructionsGC(Isolate* isolate,
                                               Handle<FixedArray> code_table);
 
-void UnpackAndRegisterProtectedInstructions(Isolate* isolate,
-                                            wasm::NativeModule* native_module);
+void UnpackAndRegisterProtectedInstructions(
+    Isolate* isolate, const wasm::NativeModule* native_module);
 
 const char* ExternalKindName(WasmExternalKind);
 
@@ -328,7 +328,7 @@ class TruncatedUserString {
 
  private:
   const char* start_;
-  int length_;
+  const int length_;
   char buffer_[kMaxLen];
 };