| // 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. |
| |
| #ifndef V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_ |
| #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_ |
| |
| #include "src/compiler/instruction.h" |
| #include "src/compiler/instruction-selector.h" |
| #include "src/compiler/linkage.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| // A helper class for the instruction selector that simplifies construction of |
| // Operands. This class implements a base for architecture-specific helpers. |
| class OperandGenerator { |
| public: |
| explicit OperandGenerator(InstructionSelector* selector) |
| : selector_(selector) {} |
| |
| InstructionOperand* DefineAsRegister(Node* node) { |
| return Define(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER)); |
| } |
| |
| InstructionOperand* DefineSameAsFirst(Node* result) { |
| return Define(result, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::SAME_AS_FIRST_INPUT)); |
| } |
| |
| InstructionOperand* DefineAsFixed(Node* node, Register reg) { |
| return Define(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER, |
| Register::ToAllocationIndex(reg))); |
| } |
| |
| InstructionOperand* DefineAsFixed(Node* node, DoubleRegister reg) { |
| return Define(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::FIXED_DOUBLE_REGISTER, |
| DoubleRegister::ToAllocationIndex(reg))); |
| } |
| |
| InstructionOperand* DefineAsConstant(Node* node) { |
| selector()->MarkAsDefined(node); |
| sequence()->AddConstant(node->id(), ToConstant(node)); |
| return ConstantOperand::Create(node->id(), zone()); |
| } |
| |
| InstructionOperand* DefineAsLocation(Node* node, LinkageLocation location, |
| MachineType type) { |
| return Define(node, ToUnallocatedOperand(location, type)); |
| } |
| |
| InstructionOperand* Use(Node* node) { |
| return Use(node, |
| new (zone()) UnallocatedOperand( |
| UnallocatedOperand::ANY, UnallocatedOperand::USED_AT_START)); |
| } |
| |
| InstructionOperand* UseRegister(Node* node) { |
| return Use(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, |
| UnallocatedOperand::USED_AT_START)); |
| } |
| |
| // Use register or operand for the node. If a register is chosen, it won't |
| // alias any temporary or output registers. |
| InstructionOperand* UseUnique(Node* node) { |
| return Use(node, new (zone()) UnallocatedOperand(UnallocatedOperand::ANY)); |
| } |
| |
| // Use a unique register for the node that does not alias any temporary or |
| // output registers. |
| InstructionOperand* UseUniqueRegister(Node* node) { |
| return Use(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER)); |
| } |
| |
| InstructionOperand* UseFixed(Node* node, Register reg) { |
| return Use(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER, |
| Register::ToAllocationIndex(reg))); |
| } |
| |
| InstructionOperand* UseFixed(Node* node, DoubleRegister reg) { |
| return Use(node, new (zone()) |
| UnallocatedOperand(UnallocatedOperand::FIXED_DOUBLE_REGISTER, |
| DoubleRegister::ToAllocationIndex(reg))); |
| } |
| |
| InstructionOperand* UseImmediate(Node* node) { |
| int index = sequence()->AddImmediate(ToConstant(node)); |
| return ImmediateOperand::Create(index, zone()); |
| } |
| |
| InstructionOperand* UseLocation(Node* node, LinkageLocation location, |
| MachineType type) { |
| return Use(node, ToUnallocatedOperand(location, type)); |
| } |
| |
| InstructionOperand* TempRegister() { |
| UnallocatedOperand* op = |
| new (zone()) UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, |
| UnallocatedOperand::USED_AT_START); |
| op->set_virtual_register(sequence()->NextVirtualRegister()); |
| return op; |
| } |
| |
| InstructionOperand* TempDoubleRegister() { |
| UnallocatedOperand* op = |
| new (zone()) UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, |
| UnallocatedOperand::USED_AT_START); |
| op->set_virtual_register(sequence()->NextVirtualRegister()); |
| sequence()->MarkAsDouble(op->virtual_register()); |
| return op; |
| } |
| |
| InstructionOperand* TempRegister(Register reg) { |
| return new (zone()) UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER, |
| Register::ToAllocationIndex(reg)); |
| } |
| |
| InstructionOperand* TempImmediate(int32_t imm) { |
| int index = sequence()->AddImmediate(Constant(imm)); |
| return ImmediateOperand::Create(index, zone()); |
| } |
| |
| InstructionOperand* Label(BasicBlock* block) { |
| // TODO(bmeurer): We misuse ImmediateOperand here. |
| return TempImmediate(block->id()); |
| } |
| |
| protected: |
| Graph* graph() const { return selector()->graph(); } |
| InstructionSelector* selector() const { return selector_; } |
| InstructionSequence* sequence() const { return selector()->sequence(); } |
| Isolate* isolate() const { return zone()->isolate(); } |
| Zone* zone() const { return selector()->instruction_zone(); } |
| |
| private: |
| static Constant ToConstant(const Node* node) { |
| switch (node->opcode()) { |
| case IrOpcode::kInt32Constant: |
| return Constant(OpParameter<int32_t>(node)); |
| case IrOpcode::kInt64Constant: |
| return Constant(OpParameter<int64_t>(node)); |
| case IrOpcode::kNumberConstant: |
| case IrOpcode::kFloat64Constant: |
| return Constant(OpParameter<double>(node)); |
| case IrOpcode::kExternalConstant: |
| return Constant(OpParameter<ExternalReference>(node)); |
| case IrOpcode::kHeapConstant: |
| return Constant(OpParameter<Unique<HeapObject> >(node).handle()); |
| default: |
| break; |
| } |
| UNREACHABLE(); |
| return Constant(static_cast<int32_t>(0)); |
| } |
| |
| UnallocatedOperand* Define(Node* node, UnallocatedOperand* operand) { |
| DCHECK_NOT_NULL(node); |
| DCHECK_NOT_NULL(operand); |
| operand->set_virtual_register(node->id()); |
| selector()->MarkAsDefined(node); |
| return operand; |
| } |
| |
| UnallocatedOperand* Use(Node* node, UnallocatedOperand* operand) { |
| DCHECK_NOT_NULL(node); |
| DCHECK_NOT_NULL(operand); |
| operand->set_virtual_register(node->id()); |
| selector()->MarkAsUsed(node); |
| return operand; |
| } |
| |
| UnallocatedOperand* ToUnallocatedOperand(LinkageLocation location, |
| MachineType type) { |
| if (location.location_ == LinkageLocation::ANY_REGISTER) { |
| return new (zone()) |
| UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER); |
| } |
| if (location.location_ < 0) { |
| return new (zone()) UnallocatedOperand(UnallocatedOperand::FIXED_SLOT, |
| location.location_); |
| } |
| if (RepresentationOf(type) == kRepFloat64) { |
| return new (zone()) UnallocatedOperand( |
| UnallocatedOperand::FIXED_DOUBLE_REGISTER, location.location_); |
| } |
| return new (zone()) UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER, |
| location.location_); |
| } |
| |
| InstructionSelector* selector_; |
| }; |
| |
| |
| // The flags continuation is a way to combine a branch or a materialization |
| // of a boolean value with an instruction that sets the flags register. |
| // The whole instruction is treated as a unit by the register allocator, and |
| // thus no spills or moves can be introduced between the flags-setting |
| // instruction and the branch or set it should be combined with. |
| class FlagsContinuation FINAL { |
| public: |
| FlagsContinuation() : mode_(kFlags_none) {} |
| |
| // Creates a new flags continuation from the given condition and true/false |
| // blocks. |
| FlagsContinuation(FlagsCondition condition, BasicBlock* true_block, |
| BasicBlock* false_block) |
| : mode_(kFlags_branch), |
| condition_(condition), |
| true_block_(true_block), |
| false_block_(false_block) { |
| DCHECK_NOT_NULL(true_block); |
| DCHECK_NOT_NULL(false_block); |
| } |
| |
| // Creates a new flags continuation from the given condition and result node. |
| FlagsContinuation(FlagsCondition condition, Node* result) |
| : mode_(kFlags_set), condition_(condition), result_(result) { |
| DCHECK_NOT_NULL(result); |
| } |
| |
| bool IsNone() const { return mode_ == kFlags_none; } |
| bool IsBranch() const { return mode_ == kFlags_branch; } |
| bool IsSet() const { return mode_ == kFlags_set; } |
| FlagsCondition condition() const { |
| DCHECK(!IsNone()); |
| return condition_; |
| } |
| Node* result() const { |
| DCHECK(IsSet()); |
| return result_; |
| } |
| BasicBlock* true_block() const { |
| DCHECK(IsBranch()); |
| return true_block_; |
| } |
| BasicBlock* false_block() const { |
| DCHECK(IsBranch()); |
| return false_block_; |
| } |
| |
| void Negate() { |
| DCHECK(!IsNone()); |
| condition_ = static_cast<FlagsCondition>(condition_ ^ 1); |
| } |
| |
| void Commute() { |
| DCHECK(!IsNone()); |
| switch (condition_) { |
| case kEqual: |
| case kNotEqual: |
| case kOverflow: |
| case kNotOverflow: |
| return; |
| case kSignedLessThan: |
| condition_ = kSignedGreaterThan; |
| return; |
| case kSignedGreaterThanOrEqual: |
| condition_ = kSignedLessThanOrEqual; |
| return; |
| case kSignedLessThanOrEqual: |
| condition_ = kSignedGreaterThanOrEqual; |
| return; |
| case kSignedGreaterThan: |
| condition_ = kSignedLessThan; |
| return; |
| case kUnsignedLessThan: |
| condition_ = kUnsignedGreaterThan; |
| return; |
| case kUnsignedGreaterThanOrEqual: |
| condition_ = kUnsignedLessThanOrEqual; |
| return; |
| case kUnsignedLessThanOrEqual: |
| condition_ = kUnsignedGreaterThanOrEqual; |
| return; |
| case kUnsignedGreaterThan: |
| condition_ = kUnsignedLessThan; |
| return; |
| case kUnorderedEqual: |
| case kUnorderedNotEqual: |
| return; |
| case kUnorderedLessThan: |
| condition_ = kUnorderedGreaterThan; |
| return; |
| case kUnorderedGreaterThanOrEqual: |
| condition_ = kUnorderedLessThanOrEqual; |
| return; |
| case kUnorderedLessThanOrEqual: |
| condition_ = kUnorderedGreaterThanOrEqual; |
| return; |
| case kUnorderedGreaterThan: |
| condition_ = kUnorderedLessThan; |
| return; |
| } |
| UNREACHABLE(); |
| } |
| |
| void OverwriteAndNegateIfEqual(FlagsCondition condition) { |
| bool negate = condition_ == kEqual; |
| condition_ = condition; |
| if (negate) Negate(); |
| } |
| |
| void SwapBlocks() { std::swap(true_block_, false_block_); } |
| |
| // Encodes this flags continuation into the given opcode. |
| InstructionCode Encode(InstructionCode opcode) { |
| opcode |= FlagsModeField::encode(mode_); |
| if (mode_ != kFlags_none) { |
| opcode |= FlagsConditionField::encode(condition_); |
| } |
| return opcode; |
| } |
| |
| private: |
| FlagsMode mode_; |
| FlagsCondition condition_; |
| Node* result_; // Only valid if mode_ == kFlags_set. |
| BasicBlock* true_block_; // Only valid if mode_ == kFlags_branch. |
| BasicBlock* false_block_; // Only valid if mode_ == kFlags_branch. |
| }; |
| |
| |
| // An internal helper class for generating the operands to calls. |
| // TODO(bmeurer): Get rid of the CallBuffer business and make |
| // InstructionSelector::VisitCall platform independent instead. |
| struct CallBuffer { |
| CallBuffer(Zone* zone, CallDescriptor* descriptor, |
| FrameStateDescriptor* frame_state); |
| |
| CallDescriptor* descriptor; |
| FrameStateDescriptor* frame_state_descriptor; |
| NodeVector output_nodes; |
| InstructionOperandVector outputs; |
| InstructionOperandVector instruction_args; |
| NodeVector pushed_nodes; |
| |
| size_t input_count() const { return descriptor->InputCount(); } |
| |
| size_t frame_state_count() const { return descriptor->FrameStateCount(); } |
| |
| size_t frame_state_value_count() const { |
| return (frame_state_descriptor == NULL) |
| ? 0 |
| : (frame_state_descriptor->GetTotalSize() + |
| 1); // Include deopt id. |
| } |
| }; |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_ |