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src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
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+// Copyright 2013 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_COMMON_OPERATOR_H_
+#define V8_COMPILER_COMMON_OPERATOR_H_
+
+#include "src/v8.h"
+
+#include "src/assembler.h"
+#include "src/compiler/linkage.h"
+#include "src/compiler/opcodes.h"
+#include "src/compiler/operator.h"
+#include "src/unique.h"
+
+namespace v8 {
+namespace internal {
+
+class OStream;
+
+namespace compiler {
+
+class ControlOperator : public Operator1<int> {
+ public:
+  ControlOperator(IrOpcode::Value opcode, uint16_t properties, int inputs,
+                  int outputs, int controls, const char* mnemonic)
+      : Operator1(opcode, properties, inputs, outputs, mnemonic, controls) {}
+
+  virtual OStream& PrintParameter(OStream& os) const { return os; }  // NOLINT
+  int ControlInputCount() const { return parameter(); }
+};
+
+class CallOperator : public Operator1<CallDescriptor*> {
+ public:
+  CallOperator(CallDescriptor* descriptor, const char* mnemonic)
+      : Operator1(IrOpcode::kCall, descriptor->properties(),
+                  descriptor->InputCount(), descriptor->ReturnCount(), mnemonic,
+                  descriptor) {}
+
+  virtual OStream& PrintParameter(OStream& os) const {  // NOLINT
+    return os << "[" << *parameter() << "]";
+  }
+};
+
+class FrameStateDescriptor {
+ public:
+  explicit FrameStateDescriptor(BailoutId bailout_id)
+      : bailout_id_(bailout_id) {}
+
+  BailoutId bailout_id() const { return bailout_id_; }
+
+ private:
+  BailoutId bailout_id_;
+};
+
+// Interface for building common operators that can be used at any level of IR,
+// including JavaScript, mid-level, and low-level.
+// TODO(titzer): Move the mnemonics into SimpleOperator and Operator1 classes.
+class CommonOperatorBuilder {
+ public:
+  explicit CommonOperatorBuilder(Zone* zone) : zone_(zone) {}
+
+#define CONTROL_OP(name, inputs, controls)                                   \
+  return new (zone_) ControlOperator(IrOpcode::k##name, Operator::kFoldable, \
+                                     inputs, 0, controls, #name);
+
+  Operator* Start() { CONTROL_OP(Start, 0, 0); }
+  Operator* Dead() { CONTROL_OP(Dead, 0, 0); }
+  Operator* End() { CONTROL_OP(End, 0, 1); }
+  Operator* Branch() { CONTROL_OP(Branch, 1, 1); }
+  Operator* IfTrue() { CONTROL_OP(IfTrue, 0, 1); }
+  Operator* IfFalse() { CONTROL_OP(IfFalse, 0, 1); }
+  Operator* Throw() { CONTROL_OP(Throw, 1, 1); }
+  Operator* LazyDeoptimization() { CONTROL_OP(LazyDeoptimization, 0, 1); }
+  Operator* Continuation() { CONTROL_OP(Continuation, 0, 1); }
+
+  Operator* Deoptimize() {
+    return new (zone_)
+        ControlOperator(IrOpcode::kDeoptimize, 0, 1, 0, 1, "Deoptimize");
+  }
+
+  Operator* Return() {
+    return new (zone_) ControlOperator(IrOpcode::kReturn, 0, 1, 0, 1, "Return");
+  }
+
+  Operator* Merge(int controls) {
+    return new (zone_) ControlOperator(IrOpcode::kMerge, Operator::kFoldable, 0,
+                                       0, controls, "Merge");
+  }
+
+  Operator* Loop(int controls) {
+    return new (zone_) ControlOperator(IrOpcode::kLoop, Operator::kFoldable, 0,
+                                       0, controls, "Loop");
+  }
+
+  Operator* Parameter(int index) {
+    return new (zone_) Operator1<int>(IrOpcode::kParameter, Operator::kPure, 0,
+                                      1, "Parameter", index);
+  }
+  Operator* Int32Constant(int32_t value) {
+    return new (zone_) Operator1<int>(IrOpcode::kInt32Constant, Operator::kPure,
+                                      0, 1, "Int32Constant", value);
+  }
+  Operator* Int64Constant(int64_t value) {
+    return new (zone_)
+        Operator1<int64_t>(IrOpcode::kInt64Constant, Operator::kPure, 0, 1,
+                           "Int64Constant", value);
+  }
+  Operator* Float64Constant(double value) {
+    return new (zone_)
+        Operator1<double>(IrOpcode::kFloat64Constant, Operator::kPure, 0, 1,
+                          "Float64Constant", value);
+  }
+  Operator* ExternalConstant(ExternalReference value) {
+    return new (zone_) Operator1<ExternalReference>(IrOpcode::kExternalConstant,
+                                                    Operator::kPure, 0, 1,
+                                                    "ExternalConstant", value);
+  }
+  Operator* NumberConstant(double value) {
+    return new (zone_)
+        Operator1<double>(IrOpcode::kNumberConstant, Operator::kPure, 0, 1,
+                          "NumberConstant", value);
+  }
+  Operator* HeapConstant(PrintableUnique<Object> value) {
+    return new (zone_) Operator1<PrintableUnique<Object> >(
+        IrOpcode::kHeapConstant, Operator::kPure, 0, 1, "HeapConstant", value);
+  }
+  Operator* Phi(int arguments) {
+    ASSERT(arguments > 0);  // Disallow empty phis.
+    return new (zone_) Operator1<int>(IrOpcode::kPhi, Operator::kPure,
+                                      arguments, 1, "Phi", arguments);
+  }
+  Operator* EffectPhi(int arguments) {
+    ASSERT(arguments > 0);  // Disallow empty phis.
+    return new (zone_) Operator1<int>(IrOpcode::kEffectPhi, Operator::kPure, 0,
+                                      0, "EffectPhi", arguments);
+  }
+  Operator* FrameState(const FrameStateDescriptor& descriptor) {
+    return new (zone_) Operator1<FrameStateDescriptor>(
+        IrOpcode::kFrameState, Operator::kPure, 0, 1, "FrameState", descriptor);
+  }
+  Operator* Call(CallDescriptor* descriptor) {
+    return new (zone_) CallOperator(descriptor, "Call");
+  }
+  Operator* Projection(int index) {
+    return new (zone_) Operator1<int>(IrOpcode::kProjection, Operator::kPure, 1,
+                                      1, "Projection", index);
+  }
+
+ private:
+  Zone* zone_;
+};
+
+
+template <typename T>
+struct CommonOperatorTraits {
+  static inline bool Equals(T a, T b);
+  static inline bool HasValue(Operator* op);
+  static inline T ValueOf(Operator* op);
+};
+
+template <>
+struct CommonOperatorTraits<int32_t> {
+  static inline bool Equals(int32_t a, int32_t b) { return a == b; }
+  static inline bool HasValue(Operator* op) {
+    return op->opcode() == IrOpcode::kInt32Constant ||
+           op->opcode() == IrOpcode::kNumberConstant;
+  }
+  static inline int32_t ValueOf(Operator* op) {
+    if (op->opcode() == IrOpcode::kNumberConstant) {
+      // TODO(titzer): cache the converted int32 value in NumberConstant.
+      return FastD2I(reinterpret_cast<Operator1<double>*>(op)->parameter());
+    }
+    CHECK_EQ(IrOpcode::kInt32Constant, op->opcode());
+    return static_cast<Operator1<int32_t>*>(op)->parameter();
+  }
+};
+
+template <>
+struct CommonOperatorTraits<uint32_t> {
+  static inline bool Equals(uint32_t a, uint32_t b) { return a == b; }
+  static inline bool HasValue(Operator* op) {
+    return CommonOperatorTraits<int32_t>::HasValue(op);
+  }
+  static inline uint32_t ValueOf(Operator* op) {
+    if (op->opcode() == IrOpcode::kNumberConstant) {
+      // TODO(titzer): cache the converted uint32 value in NumberConstant.
+      return FastD2UI(reinterpret_cast<Operator1<double>*>(op)->parameter());
+    }
+    return static_cast<uint32_t>(CommonOperatorTraits<int32_t>::ValueOf(op));
+  }
+};
+
+template <>
+struct CommonOperatorTraits<int64_t> {
+  static inline bool Equals(int64_t a, int64_t b) { return a == b; }
+  static inline bool HasValue(Operator* op) {
+    return op->opcode() == IrOpcode::kInt32Constant ||
+           op->opcode() == IrOpcode::kInt64Constant ||
+           op->opcode() == IrOpcode::kNumberConstant;
+  }
+  static inline int64_t ValueOf(Operator* op) {
+    if (op->opcode() == IrOpcode::kInt32Constant) {
+      return static_cast<int64_t>(CommonOperatorTraits<int32_t>::ValueOf(op));
+    }
+    CHECK_EQ(IrOpcode::kInt64Constant, op->opcode());
+    return static_cast<Operator1<int64_t>*>(op)->parameter();
+  }
+};
+
+template <>
+struct CommonOperatorTraits<uint64_t> {
+  static inline bool Equals(uint64_t a, uint64_t b) { return a == b; }
+  static inline bool HasValue(Operator* op) {
+    return CommonOperatorTraits<int64_t>::HasValue(op);
+  }
+  static inline uint64_t ValueOf(Operator* op) {
+    return static_cast<uint64_t>(CommonOperatorTraits<int64_t>::ValueOf(op));
+  }
+};
+
+template <>
+struct CommonOperatorTraits<double> {
+  static inline bool Equals(double a, double b) {
+    return DoubleRepresentation(a).bits == DoubleRepresentation(b).bits;
+  }
+  static inline bool HasValue(Operator* op) {
+    return op->opcode() == IrOpcode::kFloat64Constant ||
+           op->opcode() == IrOpcode::kInt32Constant ||
+           op->opcode() == IrOpcode::kNumberConstant;
+  }
+  static inline double ValueOf(Operator* op) {
+    if (op->opcode() == IrOpcode::kFloat64Constant ||
+        op->opcode() == IrOpcode::kNumberConstant) {
+      return reinterpret_cast<Operator1<double>*>(op)->parameter();
+    }
+    return static_cast<double>(CommonOperatorTraits<int32_t>::ValueOf(op));
+  }
+};
+
+template <>
+struct CommonOperatorTraits<ExternalReference> {
+  static inline bool Equals(ExternalReference a, ExternalReference b) {
+    return a == b;
+  }
+  static inline bool HasValue(Operator* op) {
+    return op->opcode() == IrOpcode::kExternalConstant;
+  }
+  static inline ExternalReference ValueOf(Operator* op) {
+    CHECK_EQ(IrOpcode::kExternalConstant, op->opcode());
+    return static_cast<Operator1<ExternalReference>*>(op)->parameter();
+  }
+};
+
+template <typename T>
+struct CommonOperatorTraits<PrintableUnique<T> > {
+  static inline bool HasValue(Operator* op) {
+    return op->opcode() == IrOpcode::kHeapConstant;
+  }
+  static inline PrintableUnique<T> ValueOf(Operator* op) {
+    CHECK_EQ(IrOpcode::kHeapConstant, op->opcode());
+    return static_cast<Operator1<PrintableUnique<T> >*>(op)->parameter();
+  }
+};
+
+template <typename T>
+struct CommonOperatorTraits<Handle<T> > {
+  static inline bool HasValue(Operator* op) {
+    return CommonOperatorTraits<PrintableUnique<T> >::HasValue(op);
+  }
+  static inline Handle<T> ValueOf(Operator* op) {
+    return CommonOperatorTraits<PrintableUnique<T> >::ValueOf(op).handle();
+  }
+};
+
+
+template <typename T>
+inline T ValueOf(Operator* op) {
+  return CommonOperatorTraits<T>::ValueOf(op);
+}
+}
+}
+}  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_COMMON_OPERATOR_H_