[wasm] Remove obsolete {WasmFunctionInfo} structure.

R=titzer@chromium.org
BUG=v8:7549

Change-Id: Ibae3ea41306ae89ee5caaa6ab2fdec6f08f2040c
Reviewed-on: https://chromium-review.googlesource.com/962361Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51927}

src/wasm/wasm-objects.cc

@@ -1526,46 +1526,6 @@ void WasmCompiledModule::LogWasmCodes(Isolate* isolate) {
   }
 }
 
-void AttachWasmFunctionInfo(Isolate* isolate, Handle<Code> code,
-                            MaybeHandle<WeakCell> weak_instance,
-                            int func_index) {
-  DCHECK(weak_instance.is_null() ||
-         weak_instance.ToHandleChecked()->value()->IsWasmInstanceObject());
-  Handle<FixedArray> deopt_data = isolate->factory()->NewFixedArray(2, TENURED);
-  if (!weak_instance.is_null()) {
-    // TODO(wasm): Introduce constants for the indexes in wasm deopt data.
-    deopt_data->set(0, *weak_instance.ToHandleChecked());
-  }
-  deopt_data->set(1, Smi::FromInt(func_index));
-
-  code->set_deoptimization_data(*deopt_data);
-}
-
-void AttachWasmFunctionInfo(Isolate* isolate, Handle<Code> code,
-                            MaybeHandle<WasmInstanceObject> instance,
-                            int func_index) {
-  MaybeHandle<WeakCell> weak_instance;
-  if (!instance.is_null()) {
-    weak_instance = isolate->factory()->NewWeakCell(instance.ToHandleChecked());
-  }
-  AttachWasmFunctionInfo(isolate, code, weak_instance, func_index);
-}
-
-WasmFunctionInfo GetWasmFunctionInfo(Isolate* isolate, Handle<Code> code) {
-  FixedArray* deopt_data = code->deoptimization_data();
-  DCHECK_LE(2, deopt_data->length());
-  MaybeHandle<WasmInstanceObject> instance;
-  Object* maybe_weak_instance = deopt_data->get(0);
-  if (maybe_weak_instance->IsWeakCell()) {
-    Object* maybe_instance = WeakCell::cast(maybe_weak_instance)->value();
-    if (maybe_instance) {
-      instance = handle(WasmInstanceObject::cast(maybe_instance), isolate);
-    }
-  }
-  int func_index = Smi::ToInt(deopt_data->get(1));
-  return {instance, func_index};
-}
-
 #undef TRACE
 
 }  // namespace internal

src/wasm/wasm-objects.h

@@ -618,27 +618,6 @@ class WasmDebugInfo : public Struct {
                                           wasm::FunctionSig*);
 };
 
-// Attach function information in the form of deoptimization data to the given
-// code object. This information will be used for generating stack traces,
-// calling imported functions in the interpreter, knowing which function to
-// compile in a lazy compile stub, and more. The deopt data will be a newly
-// allocated FixedArray of length 2, where the first element is a WeakCell
-// containing the WasmInstanceObject, and the second element is the function
-// index.
-// If calling this method repeatedly for the same instance, pass a WeakCell
-// directly in order to avoid creating many cells pointing to the same instance.
-void AttachWasmFunctionInfo(Isolate*, Handle<Code>,
-                            MaybeHandle<WeakCell> weak_instance,
-                            int func_index);
-void AttachWasmFunctionInfo(Isolate*, Handle<Code>,
-                            MaybeHandle<WasmInstanceObject>, int func_index);
-
-struct WasmFunctionInfo {
-  MaybeHandle<WasmInstanceObject> instance;
-  int func_index;
-};
-WasmFunctionInfo GetWasmFunctionInfo(Isolate*, Handle<Code>);
-
 #undef DECL_OPTIONAL_ACCESSORS
 #undef WCM_CONST_OBJECT
 #undef WCM_LARGE_NUMBER