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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Classes that describe assembly patterns as used by inline caches.
#ifndef RUNTIME_VM_INSTRUCTIONS_ARM_H_
#define RUNTIME_VM_INSTRUCTIONS_ARM_H_
#ifndef RUNTIME_VM_INSTRUCTIONS_H_
#error Do not include instructions_arm.h directly; use instructions.h instead.
#endif
#include "vm/constants_arm.h"
#include "vm/native_entry.h"
#include "vm/object.h"
namespace dart {
class InstructionPattern : public AllStatic {
public:
// Decodes a load sequence ending at 'end' (the last instruction of the
// load sequence is the instruction before the one at end). Returns the
// address of the first instruction in the sequence. Returns the register
// being loaded and the loaded object in the output parameters 'reg' and
// 'obj' respectively.
static uword DecodeLoadObject(uword end,
const ObjectPool& object_pool,
Register* reg,
Object* obj);
// Decodes a load sequence ending at 'end' (the last instruction of the
// load sequence is the instruction before the one at end). Returns the
// address of the first instruction in the sequence. Returns the register
// being loaded and the loaded immediate value in the output parameters
// 'reg' and 'value' respectively.
static uword DecodeLoadWordImmediate(uword end,
Register* reg,
intptr_t* value);
// Decodes a load sequence ending at 'end' (the last instruction of the
// load sequence is the instruction before the one at end). Returns the
// address of the first instruction in the sequence. Returns the register
// being loaded and the index in the pool being read from in the output
// parameters 'reg' and 'index' respectively.
// IMPORANT: When generating code loading values from pool on ARM use
// LoadWordFromPool macro instruction instead of emitting direct load.
// The macro instruction takes care of pool offsets that can't be
// encoded as immediates.
static uword DecodeLoadWordFromPool(uword end,
Register* reg,
intptr_t* index);
};
class CallPattern : public ValueObject {
public:
CallPattern(uword pc, const Code& code);
RawICData* IcData();
RawCode* TargetCode() const;
void SetTargetCode(const Code& code) const;
private:
const ObjectPool& object_pool_;
uword end_;
uword ic_data_load_end_;
intptr_t target_code_pool_index_;
ICData& ic_data_;
DISALLOW_COPY_AND_ASSIGN(CallPattern);
};
class NativeCallPattern : public ValueObject {
public:
NativeCallPattern(uword pc, const Code& code);
RawCode* target() const;
void set_target(const Code& target) const;
NativeFunction native_function() const;
void set_native_function(NativeFunction target) const;
private:
const ObjectPool& object_pool_;
uword end_;
intptr_t native_function_pool_index_;
intptr_t target_code_pool_index_;
DISALLOW_COPY_AND_ASSIGN(NativeCallPattern);
};
// Instance call that can switch between a direct monomorphic call, an IC call,
// and a megamorphic call.
// load guarded cid load ICData load MegamorphicCache
// load monomorphic target <-> load ICLookup stub -> load MMLookup stub
// call target.entry call stub.entry call stub.entry
class SwitchableCallPattern : public ValueObject {
public:
SwitchableCallPattern(uword pc, const Code& code);
RawObject* data() const;
RawCode* target() const;
void SetData(const Object& data) const;
void SetTarget(const Code& target) const;
private:
const ObjectPool& object_pool_;
intptr_t data_pool_index_;
intptr_t target_pool_index_;
DISALLOW_COPY_AND_ASSIGN(SwitchableCallPattern);
};
class ReturnPattern : public ValueObject {
public:
explicit ReturnPattern(uword pc);
// bx_lr = 1.
static const int kLengthInBytes = 1 * Instr::kInstrSize;
int pattern_length_in_bytes() const { return kLengthInBytes; }
bool IsValid() const;
private:
const uword pc_;
};
class PcRelativeCallPattern : public ValueObject {
public:
explicit PcRelativeCallPattern(uword pc) : pc_(pc) {}
static const int kLengthInBytes = 1 * Instr::kInstrSize;
int32_t distance() {
#if !defined(DART_PRECOMPILED_RUNTIME)
return Assembler::DecodeBranchOffset(*reinterpret_cast<int32_t*>(pc_));
#else
UNREACHABLE();
return 0;
#endif
}
void set_distance(int32_t distance) {
#if !defined(DART_PRECOMPILED_RUNTIME)
int32_t* word = reinterpret_cast<int32_t*>(pc_);
*word = Assembler::EncodeBranchOffset(distance, *word);
#else
UNREACHABLE();
#endif
}
bool IsValid() const;
private:
uword pc_;
};
class PcRelativeJumpPattern : public ValueObject {
public:
explicit PcRelativeJumpPattern(uword pc) : pc_(pc) {}
static const int kLengthInBytes = 1 * Instr::kInstrSize;
int32_t distance() {
#if !defined(DART_PRECOMPILED_RUNTIME)
return Assembler::DecodeBranchOffset(*reinterpret_cast<int32_t*>(pc_));
#else
UNREACHABLE();
return 0;
#endif
}
void set_distance(int32_t distance) {
#if !defined(DART_PRECOMPILED_RUNTIME)
int32_t* word = reinterpret_cast<int32_t*>(pc_);
*word = Assembler::EncodeBranchOffset(distance, *word);
#else
UNREACHABLE();
#endif
}
bool IsValid() const;
private:
uword pc_;
};
} // namespace dart
#endif // RUNTIME_VM_INSTRUCTIONS_ARM_H_