Land the Fan (disabled)

src/compiler/js-generic-lowering.cc

+// Copyright 2014 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/code-stubs.h"
+#include "src/compiler/common-operator.h"
+#include "src/compiler/graph-inl.h"
+#include "src/compiler/js-generic-lowering.h"
+#include "src/compiler/machine-operator.h"
+#include "src/compiler/node-aux-data-inl.h"
+#include "src/compiler/node-properties-inl.h"
+#include "src/unique.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+
+// TODO(mstarzinger): This is a temporary workaround for non-hydrogen stubs for
+// which we don't have an interface descriptor yet. Use ReplaceWithICStubCall
+// once these stub have been made into a HydrogenCodeStub.
+template <typename T>
+static CodeStubInterfaceDescriptor* GetInterfaceDescriptor(Isolate* isolate,
+                                                           T* stub) {
+  CodeStub::Major key = static_cast<CodeStub*>(stub)->MajorKey();
+  CodeStubInterfaceDescriptor* d = isolate->code_stub_interface_descriptor(key);
+  stub->InitializeInterfaceDescriptor(isolate, d);
+  return d;
+}
+
+
+JSGenericLowering::JSGenericLowering(CompilationInfo* info, JSGraph* jsgraph,
+                                     MachineOperatorBuilder* machine,
+                                     SourcePositionTable* source_positions)
+    : LoweringBuilder(jsgraph->graph(), source_positions),
+      info_(info),
+      jsgraph_(jsgraph),
+      linkage_(new (jsgraph->zone()) Linkage(info)),
+      machine_(machine) {}
+
+
+void JSGenericLowering::PatchOperator(Node* node, Operator* op) {
+  node->set_op(op);
+}
+
+
+void JSGenericLowering::PatchInsertInput(Node* node, int index, Node* input) {
+  node->InsertInput(zone(), index, input);
+}
+
+
+Node* JSGenericLowering::SmiConstant(int32_t immediate) {
+  return jsgraph()->SmiConstant(immediate);
+}
+
+
+Node* JSGenericLowering::Int32Constant(int immediate) {
+  return jsgraph()->Int32Constant(immediate);
+}
+
+
+Node* JSGenericLowering::CodeConstant(Handle<Code> code) {
+  return jsgraph()->HeapConstant(code);
+}
+
+
+Node* JSGenericLowering::FunctionConstant(Handle<JSFunction> function) {
+  return jsgraph()->HeapConstant(function);
+}
+
+
+Node* JSGenericLowering::ExternalConstant(ExternalReference ref) {
+  return jsgraph()->ExternalConstant(ref);
+}
+
+
+void JSGenericLowering::Lower(Node* node) {
+  Node* replacement = NULL;
+  // Dispatch according to the opcode.
+  switch (node->opcode()) {
+#define DECLARE_CASE(x) \
+    case IrOpcode::k##x: \
+      replacement = Lower##x(node); \
+      break;
+    DECLARE_CASE(Branch)
+    JS_OP_LIST(DECLARE_CASE)
+#undef DECLARE_CASE
+    default:
+      // Nothing to see.
+      return;
+  }
+
+  // Nothing to do if lowering was done by patching the existing node.
+  if (replacement == node) return;
+
+  // Iterate through uses of the original node and replace uses accordingly.
+  UNIMPLEMENTED();
+}
+
+
+#define REPLACE_IC_STUB_CALL(op, StubDeclaration)                              \
+Node* JSGenericLowering::Lower##op(Node* node) {                               \
+  StubDeclaration;                                                             \
+  ReplaceWithICStubCall(node, &stub);                                          \
+  return node;                                                                 \
+}
+REPLACE_IC_STUB_CALL(JSBitwiseOr,
+                     BinaryOpICStub stub(isolate(), Token::BIT_OR))
+REPLACE_IC_STUB_CALL(JSBitwiseXor,
+                     BinaryOpICStub stub(isolate(), Token::BIT_XOR))
+REPLACE_IC_STUB_CALL(JSBitwiseAnd,
+                     BinaryOpICStub stub(isolate(), Token::BIT_AND))
+REPLACE_IC_STUB_CALL(JSShiftLeft,
+                     BinaryOpICStub stub(isolate(), Token::SHL))
+REPLACE_IC_STUB_CALL(JSShiftRight,
+                     BinaryOpICStub stub(isolate(), Token::SAR))
+REPLACE_IC_STUB_CALL(JSShiftRightLogical,
+                     BinaryOpICStub stub(isolate(), Token::SHR))
+REPLACE_IC_STUB_CALL(JSAdd,
+                     BinaryOpICStub stub(isolate(), Token::ADD))
+REPLACE_IC_STUB_CALL(JSSubtract,
+                     BinaryOpICStub stub(isolate(), Token::SUB))
+REPLACE_IC_STUB_CALL(JSMultiply,
+                     BinaryOpICStub stub(isolate(), Token::MUL))
+REPLACE_IC_STUB_CALL(JSDivide,
+                     BinaryOpICStub stub(isolate(), Token::DIV))
+REPLACE_IC_STUB_CALL(JSModulus,
+                     BinaryOpICStub stub(isolate(), Token::MOD))
+REPLACE_IC_STUB_CALL(JSToNumber,
+                     ToNumberStub stub(isolate()))
+#undef REPLACE_IC_STUB_CALL
+
+
+#define REPLACE_COMPARE_IC_CALL(op, token, pure)                               \
+Node* JSGenericLowering::Lower##op(Node* node) {                               \
+  ReplaceWithCompareIC(node, token, pure);                                     \
+  return node;                                                                 \
+}
+REPLACE_COMPARE_IC_CALL(JSEqual,              Token::EQ,        false)
+REPLACE_COMPARE_IC_CALL(JSNotEqual,           Token::NE,        false)
+REPLACE_COMPARE_IC_CALL(JSStrictEqual,        Token::EQ_STRICT, true)
+REPLACE_COMPARE_IC_CALL(JSStrictNotEqual,     Token::NE_STRICT, true)
+REPLACE_COMPARE_IC_CALL(JSLessThan,           Token::LT,        false)
+REPLACE_COMPARE_IC_CALL(JSGreaterThan,        Token::GT,        false)
+REPLACE_COMPARE_IC_CALL(JSLessThanOrEqual,    Token::LTE,       false)
+REPLACE_COMPARE_IC_CALL(JSGreaterThanOrEqual, Token::GTE,       false)
+#undef REPLACE_COMPARE_IC_CALL
+
+
+#define REPLACE_RUNTIME_CALL(op, fun)                                          \
+Node* JSGenericLowering::Lower##op(Node* node) {                               \
+  ReplaceWithRuntimeCall(node, fun);                                           \
+  return node;                                                                 \
+}
+REPLACE_RUNTIME_CALL(JSTypeOf,                Runtime::kTypeof)
+REPLACE_RUNTIME_CALL(JSCreate,                Runtime::kAbort)
+REPLACE_RUNTIME_CALL(JSCreateFunctionContext, Runtime::kNewFunctionContext)
+REPLACE_RUNTIME_CALL(JSCreateCatchContext,    Runtime::kPushCatchContext)
+REPLACE_RUNTIME_CALL(JSCreateWithContext,     Runtime::kPushWithContext)
+REPLACE_RUNTIME_CALL(JSCreateBlockContext,    Runtime::kPushBlockContext)
+REPLACE_RUNTIME_CALL(JSCreateModuleContext,   Runtime::kPushModuleContext)
+REPLACE_RUNTIME_CALL(JSCreateGlobalContext,   Runtime::kAbort)
+#undef REPLACE_RUNTIME
+
+
+#define REPLACE_UNIMPLEMENTED(op)                                              \
+Node* JSGenericLowering::Lower##op(Node* node) {                               \
+  UNIMPLEMENTED();                                                             \
+  return node;                                                                 \
+}
+REPLACE_UNIMPLEMENTED(JSToString)
+REPLACE_UNIMPLEMENTED(JSToName)
+REPLACE_UNIMPLEMENTED(JSYield)
+REPLACE_UNIMPLEMENTED(JSDebugger)
+#undef REPLACE_UNIMPLEMENTED
+
+
+void JSGenericLowering::ReplaceWithCompareIC(
+    Node* node, Token::Value token, bool pure) {
+  BinaryOpICStub stub(isolate(), Token::ADD);  // TODO(mstarzinger): Hack.
+  CodeStubInterfaceDescriptor* d = stub.GetInterfaceDescriptor();
+  CallDescriptor* desc_compare = linkage()->GetStubCallDescriptor(d);
+  Handle<Code> ic = CompareIC::GetUninitialized(isolate(), token);
+  Node* compare;
+  if (pure) {
+    // A pure (strict) comparison doesn't have an effect or control.
+    // But for the graph, we need to add these inputs.
+    compare = graph()->NewNode(common()->Call(desc_compare), CodeConstant(ic),
+                               NodeProperties::GetValueInput(node, 0),
+                               NodeProperties::GetValueInput(node, 1),
+                               NodeProperties::GetContextInput(node),
+                               graph()->start(), graph()->start());
+  } else {
+    compare = graph()->NewNode(common()->Call(desc_compare), CodeConstant(ic),
+                               NodeProperties::GetValueInput(node, 0),
+                               NodeProperties::GetValueInput(node, 1),
+                               NodeProperties::GetContextInput(node),
+                               NodeProperties::GetEffectInput(node),
+                               NodeProperties::GetControlInput(node));
+  }
+  node->ReplaceInput(0, compare);
+  node->ReplaceInput(1, SmiConstant(token));
+  ReplaceWithRuntimeCall(node, Runtime::kBooleanize);
+}
+
+
+void JSGenericLowering::ReplaceWithICStubCall(Node* node,
+                                              HydrogenCodeStub* stub) {
+  CodeStubInterfaceDescriptor* d = stub->GetInterfaceDescriptor();
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d);
+  Node* stub_code = CodeConstant(stub->GetCode());
+  PatchInsertInput(node, 0, stub_code);
+  PatchOperator(node, common()->Call(desc));
+}
+
+
+void JSGenericLowering::ReplaceWithBuiltinCall(Node* node,
+                                               Builtins::JavaScript id,
+                                               int nargs) {
+  CallFunctionStub stub(isolate(), nargs - 1, NO_CALL_FUNCTION_FLAGS);
+  CodeStubInterfaceDescriptor* d = GetInterfaceDescriptor(isolate(), &stub);
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d, nargs);
+  // TODO(mstarzinger): Accessing the builtins object this way prevents sharing
+  // of code across native contexts. Fix this by loading from given context.
+  Handle<JSFunction> function(JSFunction::cast(
+      info()->context()->builtins()->javascript_builtin(id)));
+  Node* stub_code = CodeConstant(stub.GetCode());
+  Node* function_node = FunctionConstant(function);
+  PatchInsertInput(node, 0, stub_code);
+  PatchInsertInput(node, 1, function_node);
+  PatchOperator(node, common()->Call(desc));
+}
+
+
+void JSGenericLowering::ReplaceWithRuntimeCall(Node* node,
+                                               Runtime::FunctionId f,
+                                               int nargs_override) {
+  Operator::Property props = node->op()->properties();
+  const Runtime::Function* fun = Runtime::FunctionForId(f);
+  int nargs = (nargs_override < 0) ? fun->nargs : nargs_override;
+  CallDescriptor::DeoptimizationSupport deopt =
+      NodeProperties::CanLazilyDeoptimize(node)
+          ? CallDescriptor::kCanDeoptimize
+          : CallDescriptor::kCannotDeoptimize;
+  CallDescriptor* desc =
+      linkage()->GetRuntimeCallDescriptor(f, nargs, props, deopt);
+  Node* ref = ExternalConstant(ExternalReference(f, isolate()));
+  Node* arity = Int32Constant(nargs);
+  if (!centrystub_constant_.is_set()) {
+    centrystub_constant_.set(CodeConstant(CEntryStub(isolate(), 1).GetCode()));
+  }
+  PatchInsertInput(node, 0, centrystub_constant_.get());
+  PatchInsertInput(node, nargs + 1, ref);
+  PatchInsertInput(node, nargs + 2, arity);
+  PatchOperator(node, common()->Call(desc));
+}
+
+
+Node* JSGenericLowering::LowerBranch(Node* node) {
+  Node* test = graph()->NewNode(machine()->WordEqual(), node->InputAt(0),
+                                jsgraph()->TrueConstant());
+  node->ReplaceInput(0, test);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSUnaryNot(Node* node) {
+  ToBooleanStub stub(isolate());
+  CodeStubInterfaceDescriptor* d = stub.GetInterfaceDescriptor();
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d);
+  Node* to_bool =
+      graph()->NewNode(common()->Call(desc), CodeConstant(stub.GetCode()),
+                       NodeProperties::GetValueInput(node, 0),
+                       NodeProperties::GetContextInput(node),
+                       NodeProperties::GetEffectInput(node),
+                       NodeProperties::GetControlInput(node));
+  node->ReplaceInput(0, to_bool);
+  PatchInsertInput(node, 1, SmiConstant(Token::EQ));
+  ReplaceWithRuntimeCall(node, Runtime::kBooleanize);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSToBoolean(Node* node) {
+  ToBooleanStub stub(isolate());
+  CodeStubInterfaceDescriptor* d = stub.GetInterfaceDescriptor();
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d);
+  Node* to_bool =
+      graph()->NewNode(common()->Call(desc), CodeConstant(stub.GetCode()),
+                       NodeProperties::GetValueInput(node, 0),
+                       NodeProperties::GetContextInput(node),
+                       NodeProperties::GetEffectInput(node),
+                       NodeProperties::GetControlInput(node));
+  node->ReplaceInput(0, to_bool);
+  PatchInsertInput(node, 1, SmiConstant(Token::NE));
+  ReplaceWithRuntimeCall(node, Runtime::kBooleanize);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSToObject(Node* node) {
+  ReplaceWithBuiltinCall(node, Builtins::TO_OBJECT, 1);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSLoadProperty(Node* node) {
+  if (FLAG_compiled_keyed_generic_loads) {
+    KeyedLoadGenericElementStub stub(isolate());
+    ReplaceWithICStubCall(node, &stub);
+  } else {
+    ReplaceWithRuntimeCall(node, Runtime::kKeyedGetProperty);
+  }
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSLoadNamed(Node* node) {
+  Node* key =
+      jsgraph()->HeapConstant(OpParameter<PrintableUnique<Name> >(node));
+  PatchInsertInput(node, 1, key);
+  // TODO(mstarzinger): We cannot yet use KeyedLoadGenericElementStub here,
+  // because named interceptors would not fire correctly yet.
+  ReplaceWithRuntimeCall(node, Runtime::kGetProperty);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSStoreProperty(Node* node) {
+  // TODO(mstarzinger): The strict_mode needs to be carried along in the
+  // operator so that graphs are fully compositional for inlining.
+  StrictMode strict_mode = info()->strict_mode();
+  PatchInsertInput(node, 3, SmiConstant(strict_mode));
+  ReplaceWithRuntimeCall(node, Runtime::kSetProperty, 4);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSStoreNamed(Node* node) {
+  // TODO(mstarzinger): The strict_mode needs to be carried along in the
+  // operator so that graphs are fully compositional for inlining.
+  StrictMode strict_mode = info()->strict_mode();
+  Node* key =
+      jsgraph()->HeapConstant(OpParameter<PrintableUnique<Name> >(node));
+  PatchInsertInput(node, 1, key);
+  PatchInsertInput(node, 3, SmiConstant(strict_mode));
+  ReplaceWithRuntimeCall(node, Runtime::kSetProperty, 4);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSDeleteProperty(Node* node) {
+  StrictMode strict_mode = OpParameter<StrictMode>(node);
+  PatchInsertInput(node, 2, SmiConstant(strict_mode));
+  ReplaceWithBuiltinCall(node, Builtins::DELETE, 3);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSHasProperty(Node* node) {
+  ReplaceWithBuiltinCall(node, Builtins::IN, 2);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSInstanceOf(Node* node) {
+  InstanceofStub::Flags flags = static_cast<InstanceofStub::Flags>(
+      InstanceofStub::kReturnTrueFalseObject |
+      InstanceofStub::kArgsInRegisters);
+  InstanceofStub stub(isolate(), flags);
+  CodeStubInterfaceDescriptor* d = GetInterfaceDescriptor(isolate(), &stub);
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d, 0);
+  Node* stub_code = CodeConstant(stub.GetCode());
+  PatchInsertInput(node, 0, stub_code);
+  PatchOperator(node, common()->Call(desc));
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSLoadContext(Node* node) {
+  ContextAccess access = OpParameter<ContextAccess>(node);
+  PatchInsertInput(node, 1, SmiConstant(access.depth()));
+  PatchInsertInput(node, 2, SmiConstant(access.index()));
+  ReplaceWithRuntimeCall(node, Runtime::kLoadContextRelative, 3);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSStoreContext(Node* node) {
+  ContextAccess access = OpParameter<ContextAccess>(node);
+  PatchInsertInput(node, 1, SmiConstant(access.depth()));
+  PatchInsertInput(node, 2, SmiConstant(access.index()));
+  ReplaceWithRuntimeCall(node, Runtime::kStoreContextRelative, 4);
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSCallConstruct(Node* node) {
+  int arity = OpParameter<int>(node);
+  CallConstructStub stub(isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
+  CodeStubInterfaceDescriptor* d = GetInterfaceDescriptor(isolate(), &stub);
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d, arity);
+  Node* stub_code = CodeConstant(stub.GetCode());
+  Node* construct = NodeProperties::GetValueInput(node, 0);
+  PatchInsertInput(node, 0, stub_code);
+  PatchInsertInput(node, 1, Int32Constant(arity - 1));
+  PatchInsertInput(node, 2, construct);
+  PatchInsertInput(node, 3, jsgraph()->UndefinedConstant());
+  PatchOperator(node, common()->Call(desc));
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSCallFunction(Node* node) {
+  CallParameters p = OpParameter<CallParameters>(node);
+  CallFunctionStub stub(isolate(), p.arity - 2, p.flags);
+  CodeStubInterfaceDescriptor* d = GetInterfaceDescriptor(isolate(), &stub);
+  CallDescriptor* desc = linkage()->GetStubCallDescriptor(d, p.arity - 1);
+  Node* stub_code = CodeConstant(stub.GetCode());
+  PatchInsertInput(node, 0, stub_code);
+  PatchOperator(node, common()->Call(desc));
+  return node;
+}
+
+
+Node* JSGenericLowering::LowerJSCallRuntime(Node* node) {
+  Runtime::FunctionId function = OpParameter<Runtime::FunctionId>(node);
+  int arity = NodeProperties::GetValueInputCount(node);
+  ReplaceWithRuntimeCall(node, function, arity);
+  return node;
+}
+
+
+} } }  // namespace v8::internal::compiler