src/managed_register_arm.h - platform/art - Git at Google

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ART_SRC_MANAGED_REGISTER_ARM_H_
 #define ART_SRC_MANAGED_REGISTER_ARM_H_

 #include "constants.h"
 #include "logging.h"
 #include "managed_register.h"

 namespace art {
 namespace arm {

 // Values for register pairs.
 enum RegisterPair {
   R0_R1 = 0,
   R2_R3 = 1,
   R4_R5 = 2,
   R6_R7 = 3,
   R1_R2 = 4,  // Dalvik style passing
   kNumberOfRegisterPairs = 5,
   kNoRegisterPair = -1,
 };

 std::ostream& operator<<(std::ostream& os, const RegisterPair& reg);

 const int kNumberOfCoreRegIds = kNumberOfCoreRegisters;
 const int kNumberOfCoreAllocIds = kNumberOfCoreRegisters;

 const int kNumberOfSRegIds = kNumberOfSRegisters;
 const int kNumberOfSAllocIds = kNumberOfSRegisters;

 const int kNumberOfDRegIds = kNumberOfDRegisters;
 const int kNumberOfOverlappingDRegIds = kNumberOfOverlappingDRegisters;
 const int kNumberOfDAllocIds = kNumberOfDRegIds - kNumberOfOverlappingDRegIds;

 const int kNumberOfPairRegIds = kNumberOfRegisterPairs;

 const int kNumberOfRegIds = kNumberOfCoreRegIds + kNumberOfSRegIds +
     kNumberOfDRegIds + kNumberOfPairRegIds;
 const int kNumberOfAllocIds =
     kNumberOfCoreAllocIds + kNumberOfSAllocIds + kNumberOfDAllocIds;

 // Register ids map:
 //   [0..R[  core registers (enum Register)
 //   [R..S[  single precision VFP registers (enum SRegister)
 //   [S..D[  double precision VFP registers (enum DRegister)
 //   [D..P[  core register pairs (enum RegisterPair)
 // where
 //   R = kNumberOfCoreRegIds
 //   S = R + kNumberOfSRegIds
 //   D = S + kNumberOfDRegIds
 //   P = D + kNumberOfRegisterPairs

 // Allocation ids map:
 //   [0..R[  core registers (enum Register)
 //   [R..S[  single precision VFP registers (enum SRegister)
 //   [S..N[  non-overlapping double precision VFP registers (16-31 in enum
 //           DRegister, VFPv3-D32 only)
 // where
 //   R = kNumberOfCoreAllocIds
 //   S = R + kNumberOfSAllocIds
 //   N = S + kNumberOfDAllocIds


 // An instance of class 'ManagedRegister' represents a single ARM register or a
 // pair of core ARM registers (enum RegisterPair). A single register is either a
 // core register (enum Register), a VFP single precision register
 // (enum SRegister), or a VFP double precision register (enum DRegister).
 // 'ManagedRegister::NoRegister()' returns an invalid ManagedRegister.
 // There is a one-to-one mapping between ManagedRegister and register id.
 class ArmManagedRegister : public ManagedRegister {
  public:
   Register AsCoreRegister() const {
     CHECK(IsCoreRegister());
     return static_cast<Register>(id_);
   }

   SRegister AsSRegister() const {
     CHECK(IsSRegister());
     return static_cast<SRegister>(id_ - kNumberOfCoreRegIds);
   }

   DRegister AsDRegister() const {
     CHECK(IsDRegister());
     return static_cast<DRegister>(id_ - kNumberOfCoreRegIds - kNumberOfSRegIds);
   }

   SRegister AsOverlappingDRegisterLow() const {
     CHECK(IsOverlappingDRegister());
     DRegister d_reg = AsDRegister();
     return static_cast<SRegister>(d_reg * 2);
   }

   SRegister AsOverlappingDRegisterHigh() const {
     CHECK(IsOverlappingDRegister());
     DRegister d_reg = AsDRegister();
     return static_cast<SRegister>(d_reg * 2 + 1);
   }

   RegisterPair AsRegisterPair() const {
     CHECK(IsRegisterPair());
     Register reg_low = AsRegisterPairLow();
     if (reg_low == R1) {
       return R1_R2;
     } else {
       return static_cast<RegisterPair>(reg_low / 2);
     }
   }

   Register AsRegisterPairLow() const {
     CHECK(IsRegisterPair());
     // Appropriate mapping of register ids allows to use AllocIdLow().
     return FromRegId(AllocIdLow()).AsCoreRegister();
   }

   Register AsRegisterPairHigh() const {
     CHECK(IsRegisterPair());
     // Appropriate mapping of register ids allows to use AllocIdHigh().
     return FromRegId(AllocIdHigh()).AsCoreRegister();
   }

   bool IsCoreRegister() const {
     CHECK(IsValidManagedRegister());
     return (0 <= id_) && (id_ < kNumberOfCoreRegIds);
   }

   bool IsSRegister() const {
     CHECK(IsValidManagedRegister());
     const int test = id_ - kNumberOfCoreRegIds;
     return (0 <= test) && (test < kNumberOfSRegIds);
   }

   bool IsDRegister() const {
     CHECK(IsValidManagedRegister());
     const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds);
     return (0 <= test) && (test < kNumberOfDRegIds);
   }

   // Returns true if this DRegister overlaps SRegisters.
   bool IsOverlappingDRegister() const {
     CHECK(IsValidManagedRegister());
     const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds);
     return (0 <= test) && (test < kNumberOfOverlappingDRegIds);
   }

   bool IsRegisterPair() const {
     CHECK(IsValidManagedRegister());
     const int test =
         id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds + kNumberOfDRegIds);
     return (0 <= test) && (test < kNumberOfPairRegIds);
   }

   bool IsSameType(ArmManagedRegister test) const {
     CHECK(IsValidManagedRegister() && test.IsValidManagedRegister());
     return
       (IsCoreRegister() && test.IsCoreRegister()) ||
       (IsSRegister() && test.IsSRegister()) ||
       (IsDRegister() && test.IsDRegister()) ||
       (IsRegisterPair() && test.IsRegisterPair());
   }


   // Returns true if the two managed-registers ('this' and 'other') overlap.
   // Either managed-register may be the NoRegister. If both are the NoRegister
   // then false is returned.
   bool Overlaps(const ArmManagedRegister& other) const;

   void Print(std::ostream& os) const;

   static ArmManagedRegister FromCoreRegister(Register r) {
     CHECK_NE(r, kNoRegister);
     return FromRegId(r);
   }

   static ArmManagedRegister FromSRegister(SRegister r) {
     CHECK_NE(r, kNoSRegister);
     return FromRegId(r + kNumberOfCoreRegIds);
   }

   static ArmManagedRegister FromDRegister(DRegister r) {
     CHECK_NE(r, kNoDRegister);
     return FromRegId(r + (kNumberOfCoreRegIds + kNumberOfSRegIds));
   }

   static ArmManagedRegister FromRegisterPair(RegisterPair r) {
     CHECK_NE(r, kNoRegisterPair);
     return FromRegId(r + (kNumberOfCoreRegIds +
                           kNumberOfSRegIds + kNumberOfDRegIds));
   }

   // Return a RegisterPair consisting of Register r_low and r_low + 1.
   static ArmManagedRegister FromCoreRegisterPair(Register r_low) {
     if (r_low != R1) {  // not the dalvik special case
       CHECK_NE(r_low, kNoRegister);
       CHECK_EQ(0, (r_low % 2));
       const int r = r_low / 2;
       CHECK_LT(r, kNumberOfPairRegIds);
       return FromRegisterPair(static_cast<RegisterPair>(r));
     } else {
       return FromRegisterPair(R1_R2);
     }
   }

   // Return a DRegister overlapping SRegister r_low and r_low + 1.
   static ArmManagedRegister FromSRegisterPair(SRegister r_low) {
     CHECK_NE(r_low, kNoSRegister);
     CHECK_EQ(0, (r_low % 2));
     const int r = r_low / 2;
     CHECK_LT(r, kNumberOfOverlappingDRegIds);
     return FromDRegister(static_cast<DRegister>(r));
   }

  private:
   bool IsValidManagedRegister() const {
     return (0 <= id_) && (id_ < kNumberOfRegIds);
   }

   int RegId() const {
     CHECK(!IsNoRegister());
     return id_;
   }

   int AllocId() const {
     CHECK(IsValidManagedRegister() &&
            !IsOverlappingDRegister() && !IsRegisterPair());
     int r = id_;
     if ((kNumberOfDAllocIds > 0) && IsDRegister()) {  // VFPv3-D32 only.
       r -= kNumberOfOverlappingDRegIds;
     }
     CHECK_LT(r, kNumberOfAllocIds);
     return r;
   }

   int AllocIdLow() const;
   int AllocIdHigh() const;

   friend class ManagedRegister;

   explicit ArmManagedRegister(int reg_id) : ManagedRegister(reg_id) {}

   static ArmManagedRegister FromRegId(int reg_id) {
     ArmManagedRegister reg(reg_id);
     CHECK(reg.IsValidManagedRegister());
     return reg;
   }
 };

 std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg);

 }  // namespace arm

 inline arm::ArmManagedRegister ManagedRegister::AsArm() const {
   arm::ArmManagedRegister reg(id_);
   CHECK(reg.IsNoRegister() || reg.IsValidManagedRegister());
   return reg;
 }

 }  // namespace art

 #endif  // ART_SRC_MANAGED_REGISTER_ARM_H_
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ART_SRC_MANAGED_REGISTER_ARM_H_
	#define ART_SRC_MANAGED_REGISTER_ARM_H_

	#include "constants.h"
	#include "logging.h"
	#include "managed_register.h"

	namespace art {
	namespace arm {

	// Values for register pairs.
	enum RegisterPair {
	R0_R1 = 0,
	R2_R3 = 1,
	R4_R5 = 2,
	R6_R7 = 3,
	R1_R2 = 4, // Dalvik style passing
	kNumberOfRegisterPairs = 5,
	kNoRegisterPair = -1,
	};

	std::ostream& operator<<(std::ostream& os, const RegisterPair& reg);

	const int kNumberOfCoreRegIds = kNumberOfCoreRegisters;
	const int kNumberOfCoreAllocIds = kNumberOfCoreRegisters;

	const int kNumberOfSRegIds = kNumberOfSRegisters;
	const int kNumberOfSAllocIds = kNumberOfSRegisters;

	const int kNumberOfDRegIds = kNumberOfDRegisters;
	const int kNumberOfOverlappingDRegIds = kNumberOfOverlappingDRegisters;
	const int kNumberOfDAllocIds = kNumberOfDRegIds - kNumberOfOverlappingDRegIds;

	const int kNumberOfPairRegIds = kNumberOfRegisterPairs;

	const int kNumberOfRegIds = kNumberOfCoreRegIds + kNumberOfSRegIds +
	kNumberOfDRegIds + kNumberOfPairRegIds;
	const int kNumberOfAllocIds =
	kNumberOfCoreAllocIds + kNumberOfSAllocIds + kNumberOfDAllocIds;

	// Register ids map:
	// [0..R[ core registers (enum Register)
	// [R..S[ single precision VFP registers (enum SRegister)
	// [S..D[ double precision VFP registers (enum DRegister)
	// [D..P[ core register pairs (enum RegisterPair)
	// where
	// R = kNumberOfCoreRegIds
	// S = R + kNumberOfSRegIds
	// D = S + kNumberOfDRegIds
	// P = D + kNumberOfRegisterPairs

	// Allocation ids map:
	// [0..R[ core registers (enum Register)
	// [R..S[ single precision VFP registers (enum SRegister)
	// [S..N[ non-overlapping double precision VFP registers (16-31 in enum
	// DRegister, VFPv3-D32 only)
	// where
	// R = kNumberOfCoreAllocIds
	// S = R + kNumberOfSAllocIds
	// N = S + kNumberOfDAllocIds


	// An instance of class 'ManagedRegister' represents a single ARM register or a
	// pair of core ARM registers (enum RegisterPair). A single register is either a
	// core register (enum Register), a VFP single precision register
	// (enum SRegister), or a VFP double precision register (enum DRegister).
	// 'ManagedRegister::NoRegister()' returns an invalid ManagedRegister.
	// There is a one-to-one mapping between ManagedRegister and register id.
	class ArmManagedRegister : public ManagedRegister {
	public:
	Register AsCoreRegister() const {
	CHECK(IsCoreRegister());
	return static_cast<Register>(id_);
	}

	SRegister AsSRegister() const {
	CHECK(IsSRegister());
	return static_cast<SRegister>(id_ - kNumberOfCoreRegIds);
	}

	DRegister AsDRegister() const {
	CHECK(IsDRegister());
	return static_cast<DRegister>(id_ - kNumberOfCoreRegIds - kNumberOfSRegIds);
	}

	SRegister AsOverlappingDRegisterLow() const {
	CHECK(IsOverlappingDRegister());
	DRegister d_reg = AsDRegister();
	return static_cast<SRegister>(d_reg * 2);
	}

	SRegister AsOverlappingDRegisterHigh() const {
	CHECK(IsOverlappingDRegister());
	DRegister d_reg = AsDRegister();
	return static_cast<SRegister>(d_reg * 2 + 1);
	}

	RegisterPair AsRegisterPair() const {
	CHECK(IsRegisterPair());
	Register reg_low = AsRegisterPairLow();
	if (reg_low == R1) {
	return R1_R2;
	} else {
	return static_cast<RegisterPair>(reg_low / 2);
	}
	}

	Register AsRegisterPairLow() const {
	CHECK(IsRegisterPair());
	// Appropriate mapping of register ids allows to use AllocIdLow().
	return FromRegId(AllocIdLow()).AsCoreRegister();
	}

	Register AsRegisterPairHigh() const {
	CHECK(IsRegisterPair());
	// Appropriate mapping of register ids allows to use AllocIdHigh().
	return FromRegId(AllocIdHigh()).AsCoreRegister();
	}

	bool IsCoreRegister() const {
	CHECK(IsValidManagedRegister());
	return (0 <= id_) && (id_ < kNumberOfCoreRegIds);
	}

	bool IsSRegister() const {
	CHECK(IsValidManagedRegister());
	const int test = id_ - kNumberOfCoreRegIds;
	return (0 <= test) && (test < kNumberOfSRegIds);
	}

	bool IsDRegister() const {
	CHECK(IsValidManagedRegister());
	const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds);
	return (0 <= test) && (test < kNumberOfDRegIds);
	}

	// Returns true if this DRegister overlaps SRegisters.
	bool IsOverlappingDRegister() const {
	CHECK(IsValidManagedRegister());
	const int test = id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds);
	return (0 <= test) && (test < kNumberOfOverlappingDRegIds);
	}

	bool IsRegisterPair() const {
	CHECK(IsValidManagedRegister());
	const int test =
	id_ - (kNumberOfCoreRegIds + kNumberOfSRegIds + kNumberOfDRegIds);
	return (0 <= test) && (test < kNumberOfPairRegIds);
	}

	bool IsSameType(ArmManagedRegister test) const {
	CHECK(IsValidManagedRegister() && test.IsValidManagedRegister());
	return
	(IsCoreRegister() && test.IsCoreRegister()) \|\|
	(IsSRegister() && test.IsSRegister()) \|\|
	(IsDRegister() && test.IsDRegister()) \|\|
	(IsRegisterPair() && test.IsRegisterPair());
	}


	// Returns true if the two managed-registers ('this' and 'other') overlap.
	// Either managed-register may be the NoRegister. If both are the NoRegister
	// then false is returned.
	bool Overlaps(const ArmManagedRegister& other) const;

	void Print(std::ostream& os) const;

	static ArmManagedRegister FromCoreRegister(Register r) {
	CHECK_NE(r, kNoRegister);
	return FromRegId(r);
	}

	static ArmManagedRegister FromSRegister(SRegister r) {
	CHECK_NE(r, kNoSRegister);
	return FromRegId(r + kNumberOfCoreRegIds);
	}

	static ArmManagedRegister FromDRegister(DRegister r) {
	CHECK_NE(r, kNoDRegister);
	return FromRegId(r + (kNumberOfCoreRegIds + kNumberOfSRegIds));
	}

	static ArmManagedRegister FromRegisterPair(RegisterPair r) {
	CHECK_NE(r, kNoRegisterPair);
	return FromRegId(r + (kNumberOfCoreRegIds +
	kNumberOfSRegIds + kNumberOfDRegIds));
	}

	// Return a RegisterPair consisting of Register r_low and r_low + 1.
	static ArmManagedRegister FromCoreRegisterPair(Register r_low) {
	if (r_low != R1) { // not the dalvik special case
	CHECK_NE(r_low, kNoRegister);
	CHECK_EQ(0, (r_low % 2));
	const int r = r_low / 2;
	CHECK_LT(r, kNumberOfPairRegIds);
	return FromRegisterPair(static_cast<RegisterPair>(r));
	} else {
	return FromRegisterPair(R1_R2);
	}
	}

	// Return a DRegister overlapping SRegister r_low and r_low + 1.
	static ArmManagedRegister FromSRegisterPair(SRegister r_low) {
	CHECK_NE(r_low, kNoSRegister);
	CHECK_EQ(0, (r_low % 2));
	const int r = r_low / 2;
	CHECK_LT(r, kNumberOfOverlappingDRegIds);
	return FromDRegister(static_cast<DRegister>(r));
	}

	private:
	bool IsValidManagedRegister() const {
	return (0 <= id_) && (id_ < kNumberOfRegIds);
	}

	int RegId() const {
	CHECK(!IsNoRegister());
	return id_;
	}

	int AllocId() const {
	CHECK(IsValidManagedRegister() &&
	!IsOverlappingDRegister() && !IsRegisterPair());
	int r = id_;
	if ((kNumberOfDAllocIds > 0) && IsDRegister()) { // VFPv3-D32 only.
	r -= kNumberOfOverlappingDRegIds;
	}
	CHECK_LT(r, kNumberOfAllocIds);
	return r;
	}

	int AllocIdLow() const;
	int AllocIdHigh() const;

	friend class ManagedRegister;

	explicit ArmManagedRegister(int reg_id) : ManagedRegister(reg_id) {}

	static ArmManagedRegister FromRegId(int reg_id) {
	ArmManagedRegister reg(reg_id);
	CHECK(reg.IsValidManagedRegister());
	return reg;
	}
	};

	std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg);

	} // namespace arm

	inline arm::ArmManagedRegister ManagedRegister::AsArm() const {
	arm::ArmManagedRegister reg(id_);
	CHECK(reg.IsNoRegister() \|\| reg.IsValidManagedRegister());
	return reg;
	}

	} // namespace art

	#endif // ART_SRC_MANAGED_REGISTER_ARM_H_