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Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/deps/v8/src/builtins/builtins-wasm-gen.cc

// Copyright 2017 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.

#include "src/builtins/builtins-wasm-gen.h"

#include "src/builtins/builtins-utils-gen.h"
#include "src/codegen/code-stub-assembler.h"
#include "src/codegen/interface-descriptors.h"
#include "src/objects/map-inl.h"
#include "src/objects/objects-inl.h"
#include "src/wasm/wasm-objects.h"

namespace v8 {
namespace internal {

TNode<WasmInstanceObject> WasmBuiltinsAssembler::LoadInstanceFromFrame() {
  return CAST(LoadFromParentFrame(WasmFrameConstants::kWasmInstanceOffset));
}

TNode<NativeContext> WasmBuiltinsAssembler::LoadContextFromWasmOrJsFrame() {
  static_assert(BuiltinFrameConstants::kFunctionOffset ==
                WasmFrameConstants::kWasmInstanceOffset);
  TVARIABLE(NativeContext, context_result);
  TNode<HeapObject> function_or_instance =
      CAST(LoadFromParentFrame(WasmFrameConstants::kWasmInstanceOffset));
  Label js(this);
  Label apifunc(this);
  Label done(this);
  TNode<Uint16T> instance_type =
      LoadMapInstanceType(LoadMap(function_or_instance));
  GotoIf(IsJSFunctionInstanceType(instance_type), &js);
  GotoIf(Word32Equal(instance_type, Int32Constant(WASM_API_FUNCTION_REF_TYPE)),
         &apifunc);
  context_result = LoadContextFromInstance(CAST(function_or_instance));
  Goto(&done);

  BIND(&js);
  TNode<JSFunction> function = CAST(function_or_instance);
  TNode<Context> context =
      LoadObjectField<Context>(function, JSFunction::kContextOffset);
  context_result = LoadNativeContext(context);
  Goto(&done);

  BIND(&apifunc);
  TNode<WasmApiFunctionRef> apiref = CAST(function_or_instance);
  context_result = LoadObjectField<NativeContext>(
      apiref, WasmApiFunctionRef::kNativeContextOffset);
  Goto(&done);

  BIND(&done);
  return context_result.value();
}

TNode<NativeContext> WasmBuiltinsAssembler::LoadContextFromInstance(
    TNode<WasmInstanceObject> instance) {
  return CAST(Load(MachineType::AnyTagged(), instance,
                   IntPtrConstant(WasmInstanceObject::kNativeContextOffset -
                                  kHeapObjectTag)));
}

TNode<FixedArray> WasmBuiltinsAssembler::LoadTablesFromInstance(
    TNode<WasmInstanceObject> instance) {
  return LoadObjectField<FixedArray>(instance,
                                     WasmInstanceObject::kTablesOffset);
}

TNode<FixedArray> WasmBuiltinsAssembler::LoadInternalFunctionsFromInstance(
    TNode<WasmInstanceObject> instance) {
  return LoadObjectField<FixedArray>(
      instance, WasmInstanceObject::kWasmInternalFunctionsOffset);
}

TNode<FixedArray> WasmBuiltinsAssembler::LoadManagedObjectMapsFromInstance(
    TNode<WasmInstanceObject> instance) {
  return LoadObjectField<FixedArray>(
      instance, WasmInstanceObject::kManagedObjectMapsOffset);
}

TNode<Float64T> WasmBuiltinsAssembler::StringToFloat64(TNode<String> input) {
#ifdef V8_ENABLE_FP_PARAMS_IN_C_LINKAGE
  TNode<ExternalReference> string_to_float64 =
      ExternalConstant(ExternalReference::wasm_string_to_f64());
  return TNode<Float64T>::UncheckedCast(
      CallCFunction(string_to_float64, MachineType::Float64(),
                    std::make_pair(MachineType::AnyTagged(), input)));
#else
  // We could support the fast path by passing the float via a stackslot, see
  // MachineOperatorBuilder::StackSlot.
  TNode<Object> result =
      CallRuntime(Runtime::kStringParseFloat, NoContextConstant(), input);
  return ChangeNumberToFloat64(CAST(result));
#endif
}

TF_BUILTIN(WasmFloat32ToNumber, WasmBuiltinsAssembler) {
  auto val = UncheckedParameter<Float32T>(Descriptor::kValue);
  Return(ChangeFloat32ToTagged(val));
}

TF_BUILTIN(WasmFloat64ToNumber, WasmBuiltinsAssembler) {
  auto val = UncheckedParameter<Float64T>(Descriptor::kValue);
  Return(ChangeFloat64ToTagged(val));
}

TF_BUILTIN(WasmFloat64ToString, WasmBuiltinsAssembler) {
  TNode<Float64T> val = UncheckedParameter<Float64T>(Descriptor::kValue);
  // Having to allocate a HeapNumber is a bit unfortunate, but the subsequent
  // runtime call will have to allocate a string anyway, which probably
  // dwarfs the cost of one more small allocation here.
  TNode<Number> tagged = ChangeFloat64ToTagged(val);
  Return(NumberToString(tagged));
}

TF_BUILTIN(JSToWasmLazyDeoptContinuation, WasmBuiltinsAssembler) {
  // Reset thread_in_wasm_flag.
  TNode<ExternalReference> thread_in_wasm_flag_address_address =
      ExternalConstant(
          ExternalReference::thread_in_wasm_flag_address_address(isolate()));
  auto thread_in_wasm_flag_address =
      Load<RawPtrT>(thread_in_wasm_flag_address_address);
  StoreNoWriteBarrier(MachineRepresentation::kWord32,
                      thread_in_wasm_flag_address, Int32Constant(0));

  // Return the argument.
  auto value = Parameter<Object>(Descriptor::kArgument);
  Return(value);
}
TF_BUILTIN(WasmToJsWrapperCSA, WasmBuiltinsAssembler) {
  TorqueStructWasmToJSResult result = WasmToJSWrapper(
      UncheckedParameter<WasmApiFunctionRef>(Descriptor::kWasmApiFunctionRef));
  PopAndReturn(result.popCount, result.result0, result.result1, result.result2,
               result.result3);
}
}  // namespace internal
}  // namespace v8

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