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/*
* Copyright (C) 2014 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_COMPILER_OPTIMIZING_NODES_H_
#define ART_COMPILER_OPTIMIZING_NODES_H_
#include "locations.h"
#include "utils/allocation.h"
#include "utils/arena_bit_vector.h"
#include "utils/growable_array.h"
namespace art {
class HBasicBlock;
class HEnvironment;
class HInstruction;
class HIntConstant;
class HGraphVisitor;
class HPhi;
class LiveInterval;
class LocationSummary;
static const int kDefaultNumberOfBlocks = 8;
static const int kDefaultNumberOfSuccessors = 2;
static const int kDefaultNumberOfPredecessors = 2;
static const int kDefaultNumberOfBackEdges = 1;
class HInstructionList {
public:
HInstructionList() : first_instruction_(nullptr), last_instruction_(nullptr) {}
void AddInstruction(HInstruction* instruction);
void RemoveInstruction(HInstruction* instruction);
private:
HInstruction* first_instruction_;
HInstruction* last_instruction_;
friend class HBasicBlock;
friend class HInstructionIterator;
friend class HBackwardInstructionIterator;
DISALLOW_COPY_AND_ASSIGN(HInstructionList);
};
// Control-flow graph of a method. Contains a list of basic blocks.
class HGraph : public ArenaObject {
public:
explicit HGraph(ArenaAllocator* arena)
: arena_(arena),
blocks_(arena, kDefaultNumberOfBlocks),
reverse_post_order_(arena, kDefaultNumberOfBlocks),
maximum_number_of_out_vregs_(0),
number_of_vregs_(0),
number_of_in_vregs_(0),
current_instruction_id_(0) { }
ArenaAllocator* GetArena() const { return arena_; }
const GrowableArray<HBasicBlock*>& GetBlocks() const { return blocks_; }
HBasicBlock* GetEntryBlock() const { return entry_block_; }
HBasicBlock* GetExitBlock() const { return exit_block_; }
void SetEntryBlock(HBasicBlock* block) { entry_block_ = block; }
void SetExitBlock(HBasicBlock* block) { exit_block_ = block; }
void AddBlock(HBasicBlock* block);
void BuildDominatorTree();
void TransformToSSA();
void SimplifyCFG();
// Find all natural loops in this graph. Aborts computation and returns false
// if one loop is not natural, that is the header does not dominate the back
// edge.
bool FindNaturalLoops() const;
void SplitCriticalEdge(HBasicBlock* block, HBasicBlock* successor);
void SimplifyLoop(HBasicBlock* header);
int GetNextInstructionId() {
return current_instruction_id_++;
}
uint16_t GetMaximumNumberOfOutVRegs() const {
return maximum_number_of_out_vregs_;
}
void UpdateMaximumNumberOfOutVRegs(uint16_t new_value) {
maximum_number_of_out_vregs_ = std::max(new_value, maximum_number_of_out_vregs_);
}
void SetNumberOfVRegs(uint16_t number_of_vregs) {
number_of_vregs_ = number_of_vregs;
}
uint16_t GetNumberOfVRegs() const {
return number_of_vregs_;
}
void SetNumberOfInVRegs(uint16_t value) {
number_of_in_vregs_ = value;
}
uint16_t GetNumberOfInVRegs() const {
return number_of_in_vregs_;
}
const GrowableArray<HBasicBlock*>& GetReversePostOrder() const {
return reverse_post_order_;
}
private:
HBasicBlock* FindCommonDominator(HBasicBlock* first, HBasicBlock* second) const;
void VisitBlockForDominatorTree(HBasicBlock* block,
HBasicBlock* predecessor,
GrowableArray<size_t>* visits);
void FindBackEdges(ArenaBitVector* visited);
void VisitBlockForBackEdges(HBasicBlock* block,
ArenaBitVector* visited,
ArenaBitVector* visiting);
void RemoveDeadBlocks(const ArenaBitVector& visited) const;
ArenaAllocator* const arena_;
// List of blocks in insertion order.
GrowableArray<HBasicBlock*> blocks_;
// List of blocks to perform a reverse post order tree traversal.
GrowableArray<HBasicBlock*> reverse_post_order_;
HBasicBlock* entry_block_;
HBasicBlock* exit_block_;
// The maximum number of virtual registers arguments passed to a HInvoke in this graph.
uint16_t maximum_number_of_out_vregs_;
// The number of virtual registers in this method. Contains the parameters.
uint16_t number_of_vregs_;
// The number of virtual registers used by parameters of this method.
uint16_t number_of_in_vregs_;
// The current id to assign to a newly added instruction. See HInstruction.id_.
int current_instruction_id_;
DISALLOW_COPY_AND_ASSIGN(HGraph);
};
class HLoopInformation : public ArenaObject {
public:
HLoopInformation(HBasicBlock* header, HGraph* graph)
: header_(header),
back_edges_(graph->GetArena(), kDefaultNumberOfBackEdges),
blocks_(graph->GetArena(), graph->GetBlocks().Size(), false) {}
HBasicBlock* GetHeader() const {
return header_;
}
void AddBackEdge(HBasicBlock* back_edge) {
back_edges_.Add(back_edge);
}
void RemoveBackEdge(HBasicBlock* back_edge) {
back_edges_.Delete(back_edge);
}
bool IsBackEdge(HBasicBlock* block) {
for (size_t i = 0, e = back_edges_.Size(); i < e; ++i) {
if (back_edges_.Get(i) == block) return true;
}
return false;
}
int NumberOfBackEdges() const {
return back_edges_.Size();
}
HBasicBlock* GetPreHeader() const;
const GrowableArray<HBasicBlock*>& GetBackEdges() const {
return back_edges_;
}
void ClearBackEdges() {
back_edges_.Reset();
}
// Find blocks that are part of this loop. Returns whether the loop is a natural loop,
// that is the header dominates the back edge.
bool Populate();
// Returns whether this loop information contains `block`.
// Note that this loop information *must* be populated before entering this function.
bool Contains(const HBasicBlock& block) const;
// Returns whether this loop information is an inner loop of `other`.
// Note that `other` *must* be populated before entering this function.
bool IsIn(const HLoopInformation& other) const;
const ArenaBitVector& GetBlocks() const { return blocks_; }
private:
// Internal recursive implementation of `Populate`.
void PopulateRecursive(HBasicBlock* block);
HBasicBlock* header_;
GrowableArray<HBasicBlock*> back_edges_;
ArenaBitVector blocks_;
DISALLOW_COPY_AND_ASSIGN(HLoopInformation);
};
static constexpr size_t kNoLifetime = -1;
// A block in a method. Contains the list of instructions represented
// as a double linked list. Each block knows its predecessors and
// successors.
class HBasicBlock : public ArenaObject {
public:
explicit HBasicBlock(HGraph* graph)
: graph_(graph),
predecessors_(graph->GetArena(), kDefaultNumberOfPredecessors),
successors_(graph->GetArena(), kDefaultNumberOfSuccessors),
loop_information_(nullptr),
dominator_(nullptr),
block_id_(-1),
lifetime_start_(kNoLifetime),
lifetime_end_(kNoLifetime) {}
const GrowableArray<HBasicBlock*>& GetPredecessors() const {
return predecessors_;
}
const GrowableArray<HBasicBlock*>& GetSuccessors() const {
return successors_;
}
void AddBackEdge(HBasicBlock* back_edge) {
if (loop_information_ == nullptr) {
loop_information_ = new (graph_->GetArena()) HLoopInformation(this, graph_);
}
DCHECK_EQ(loop_information_->GetHeader(), this);
loop_information_->AddBackEdge(back_edge);
}
HGraph* GetGraph() const { return graph_; }
int GetBlockId() const { return block_id_; }
void SetBlockId(int id) { block_id_ = id; }
HBasicBlock* GetDominator() const { return dominator_; }
void SetDominator(HBasicBlock* dominator) { dominator_ = dominator; }
int NumberOfBackEdges() const {
return loop_information_ == nullptr
? 0
: loop_information_->NumberOfBackEdges();
}
HInstruction* GetFirstInstruction() const { return instructions_.first_instruction_; }
HInstruction* GetLastInstruction() const { return instructions_.last_instruction_; }
const HInstructionList& GetInstructions() const { return instructions_; }
const HInstructionList& GetPhis() const { return phis_; }
HInstruction* GetFirstPhi() const { return phis_.first_instruction_; }
void AddSuccessor(HBasicBlock* block) {
successors_.Add(block);
block->predecessors_.Add(this);
}
void RemovePredecessor(HBasicBlock* block, bool remove_in_successor = true) {
predecessors_.Delete(block);
if (remove_in_successor) {
block->successors_.Delete(this);
}
}
void RemoveSuccessor(HBasicBlock* block, bool remove_in_predecessor = true) {
successors_.Delete(block);
if (remove_in_predecessor) {
block->predecessors_.Delete(this);
}
}
void ClearAllPredecessors() {
predecessors_.Reset();
}
void AddPredecessor(HBasicBlock* block) {
predecessors_.Add(block);
block->successors_.Add(this);
}
size_t GetPredecessorIndexOf(HBasicBlock* predecessor) {
for (size_t i = 0, e = predecessors_.Size(); i < e; ++i) {
if (predecessors_.Get(i) == predecessor) {
return i;
}
}
return -1;
}
void AddInstruction(HInstruction* instruction);
void RemoveInstruction(HInstruction* instruction);
void InsertInstructionBefore(HInstruction* instruction, HInstruction* cursor);
void AddPhi(HPhi* phi);
void RemovePhi(HPhi* phi);
bool IsLoopHeader() const {
return (loop_information_ != nullptr) && (loop_information_->GetHeader() == this);
}
HLoopInformation* GetLoopInformation() const {
return loop_information_;
}
// Set the loop_information_ on this block. This method overrides the current
// loop_information if it is an outer loop of the passed loop information.
void SetInLoop(HLoopInformation* info) {
if (IsLoopHeader()) {
// Nothing to do. This just means `info` is an outer loop.
} else if (loop_information_ == nullptr) {
loop_information_ = info;
} else if (loop_information_->Contains(*info->GetHeader())) {
// Block is currently part of an outer loop. Make it part of this inner loop.
// Note that a non loop header having a loop information means this loop information
// has already been populated
loop_information_ = info;
} else {
// Block is part of an inner loop. Do not update the loop information.
// Note that we cannot do the check `info->Contains(loop_information_)->GetHeader()`
// at this point, because this method is being called while populating `info`.
}
}
// Returns wheter this block dominates the blocked passed as parameter.
bool Dominates(HBasicBlock* block) const;
size_t GetLifetimeStart() const { return lifetime_start_; }
size_t GetLifetimeEnd() const { return lifetime_end_; }
void SetLifetimeStart(size_t start) { lifetime_start_ = start; }
void SetLifetimeEnd(size_t end) { lifetime_end_ = end; }
private:
HGraph* const graph_;
GrowableArray<HBasicBlock*> predecessors_;
GrowableArray<HBasicBlock*> successors_;
HInstructionList instructions_;
HInstructionList phis_;
HLoopInformation* loop_information_;
HBasicBlock* dominator_;
int block_id_;
size_t lifetime_start_;
size_t lifetime_end_;
DISALLOW_COPY_AND_ASSIGN(HBasicBlock);
};
#define FOR_EACH_INSTRUCTION(M) \
M(Add) \
M(Equal) \
M(Exit) \
M(Goto) \
M(If) \
M(IntConstant) \
M(InvokeStatic) \
M(LoadLocal) \
M(Local) \
M(LongConstant) \
M(NewInstance) \
M(Not) \
M(ParameterValue) \
M(ParallelMove) \
M(Phi) \
M(Return) \
M(ReturnVoid) \
M(StoreLocal) \
M(Sub) \
#define FORWARD_DECLARATION(type) class H##type;
FOR_EACH_INSTRUCTION(FORWARD_DECLARATION)
#undef FORWARD_DECLARATION
#define DECLARE_INSTRUCTION(type) \
virtual const char* DebugName() const { return #type; } \
virtual H##type* As##type() { return this; } \
virtual void Accept(HGraphVisitor* visitor) \
template <typename T>
class HUseListNode : public ArenaObject {
public:
HUseListNode(T* user, size_t index, HUseListNode* tail)
: user_(user), index_(index), tail_(tail) { }
HUseListNode* GetTail() const { return tail_; }
T* GetUser() const { return user_; }
size_t GetIndex() const { return index_; }
void SetTail(HUseListNode<T>* node) { tail_ = node; }
private:
T* const user_;
const size_t index_;
HUseListNode<T>* tail_;
DISALLOW_COPY_AND_ASSIGN(HUseListNode);
};
class HInstruction : public ArenaObject {
public:
HInstruction()
: previous_(nullptr),
next_(nullptr),
block_(nullptr),
id_(-1),
ssa_index_(-1),
uses_(nullptr),
env_uses_(nullptr),
environment_(nullptr),
locations_(nullptr),
live_interval_(nullptr),
lifetime_position_(kNoLifetime) {}
virtual ~HInstruction() { }
HInstruction* GetNext() const { return next_; }
HInstruction* GetPrevious() const { return previous_; }
HBasicBlock* GetBlock() const { return block_; }
void SetBlock(HBasicBlock* block) { block_ = block; }
virtual size_t InputCount() const = 0;
virtual HInstruction* InputAt(size_t i) const = 0;
virtual void Accept(HGraphVisitor* visitor) = 0;
virtual const char* DebugName() const = 0;
virtual Primitive::Type GetType() const { return Primitive::kPrimVoid; }
virtual void SetRawInputAt(size_t index, HInstruction* input) = 0;
virtual bool NeedsEnvironment() const { return false; }
void AddUseAt(HInstruction* user, size_t index) {
uses_ = new (block_->GetGraph()->GetArena()) HUseListNode<HInstruction>(user, index, uses_);
}
void AddEnvUseAt(HEnvironment* user, size_t index) {
env_uses_ = new (block_->GetGraph()->GetArena()) HUseListNode<HEnvironment>(
user, index, env_uses_);
}
void RemoveUser(HInstruction* user, size_t index);
HUseListNode<HInstruction>* GetUses() const { return uses_; }
HUseListNode<HEnvironment>* GetEnvUses() const { return env_uses_; }
bool HasUses() const { return uses_ != nullptr || env_uses_ != nullptr; }
size_t NumberOfUses() const {
// TODO: Optimize this method if it is used outside of the HGraphVisualizer.
size_t result = 0;
HUseListNode<HInstruction>* current = uses_;
while (current != nullptr) {
current = current->GetTail();
++result;
}
return result;
}
int GetId() const { return id_; }
void SetId(int id) { id_ = id; }
int GetSsaIndex() const { return ssa_index_; }
void SetSsaIndex(int ssa_index) { ssa_index_ = ssa_index; }
bool HasSsaIndex() const { return ssa_index_ != -1; }
bool HasEnvironment() const { return environment_ != nullptr; }
HEnvironment* GetEnvironment() const { return environment_; }
void SetEnvironment(HEnvironment* environment) { environment_ = environment; }
LocationSummary* GetLocations() const { return locations_; }
void SetLocations(LocationSummary* locations) { locations_ = locations; }
void ReplaceWith(HInstruction* instruction);
#define INSTRUCTION_TYPE_CHECK(type) \
virtual H##type* As##type() { return nullptr; }
FOR_EACH_INSTRUCTION(INSTRUCTION_TYPE_CHECK)
#undef INSTRUCTION_TYPE_CHECK
size_t GetLifetimePosition() const { return lifetime_position_; }
void SetLifetimePosition(size_t position) { lifetime_position_ = position; }
LiveInterval* GetLiveInterval() const { return live_interval_; }
void SetLiveInterval(LiveInterval* interval) { live_interval_ = interval; }
bool HasLiveInterval() const { return live_interval_ != nullptr; }
private:
HInstruction* previous_;
HInstruction* next_;
HBasicBlock* block_;
// An instruction gets an id when it is added to the graph.
// It reflects creation order. A negative id means the instruction
// has not beed added to the graph.
int id_;
// When doing liveness analysis, instructions that have uses get an SSA index.
int ssa_index_;
// List of instructions that have this instruction as input.
HUseListNode<HInstruction>* uses_;
// List of environments that contain this instruction.
HUseListNode<HEnvironment>* env_uses_;
HEnvironment* environment_;
// Set by the code generator.
LocationSummary* locations_;
// Set by the liveness analysis.
LiveInterval* live_interval_;
// Set by the liveness analysis, this is the position in a linear
// order of blocks where this instruction's live interval start.
size_t lifetime_position_;
friend class HBasicBlock;
friend class HInstructionList;
DISALLOW_COPY_AND_ASSIGN(HInstruction);
};
template<typename T>
class HUseIterator : public ValueObject {
public:
explicit HUseIterator(HUseListNode<T>* uses) : current_(uses) {}
bool Done() const { return current_ == nullptr; }
void Advance() {
DCHECK(!Done());
current_ = current_->GetTail();
}
HUseListNode<T>* Current() const {
DCHECK(!Done());
return current_;
}
private:
HUseListNode<T>* current_;
friend class HValue;
};
// A HEnvironment object contains the values of virtual registers at a given location.
class HEnvironment : public ArenaObject {
public:
HEnvironment(ArenaAllocator* arena, size_t number_of_vregs) : vregs_(arena, number_of_vregs) {
vregs_.SetSize(number_of_vregs);
for (size_t i = 0; i < number_of_vregs; i++) {
vregs_.Put(i, nullptr);
}
}
void Populate(const GrowableArray<HInstruction*>& env) {
for (size_t i = 0; i < env.Size(); i++) {
HInstruction* instruction = env.Get(i);
vregs_.Put(i, instruction);
if (instruction != nullptr) {
instruction->AddEnvUseAt(this, i);
}
}
}
void SetRawEnvAt(size_t index, HInstruction* instruction) {
vregs_.Put(index, instruction);
}
GrowableArray<HInstruction*>* GetVRegs() {
return &vregs_;
}
private:
GrowableArray<HInstruction*> vregs_;
DISALLOW_COPY_AND_ASSIGN(HEnvironment);
};
class HInputIterator : public ValueObject {
public:
explicit HInputIterator(HInstruction* instruction) : instruction_(instruction), index_(0) { }
bool Done() const { return index_ == instruction_->InputCount(); }
HInstruction* Current() const { return instruction_->InputAt(index_); }
void Advance() { index_++; }
private:
HInstruction* instruction_;
size_t index_;
DISALLOW_COPY_AND_ASSIGN(HInputIterator);
};
class HInstructionIterator : public ValueObject {
public:
explicit HInstructionIterator(const HInstructionList& instructions)
: instruction_(instructions.first_instruction_) {
next_ = Done() ? nullptr : instruction_->GetNext();
}
bool Done() const { return instruction_ == nullptr; }
HInstruction* Current() const { return instruction_; }
void Advance() {
instruction_ = next_;
next_ = Done() ? nullptr : instruction_->GetNext();
}
private:
HInstruction* instruction_;
HInstruction* next_;
DISALLOW_COPY_AND_ASSIGN(HInstructionIterator);
};
class HBackwardInstructionIterator : public ValueObject {
public:
explicit HBackwardInstructionIterator(const HInstructionList& instructions)
: instruction_(instructions.last_instruction_) {
next_ = Done() ? nullptr : instruction_->GetPrevious();
}
bool Done() const { return instruction_ == nullptr; }
HInstruction* Current() const { return instruction_; }
void Advance() {
instruction_ = next_;
next_ = Done() ? nullptr : instruction_->GetPrevious();
}
private:
HInstruction* instruction_;
HInstruction* next_;
DISALLOW_COPY_AND_ASSIGN(HBackwardInstructionIterator);
};
// An embedded container with N elements of type T. Used (with partial
// specialization for N=0) because embedded arrays cannot have size 0.
template<typename T, intptr_t N>
class EmbeddedArray {
public:
EmbeddedArray() : elements_() { }
intptr_t GetLength() const { return N; }
const T& operator[](intptr_t i) const {
DCHECK_LT(i, GetLength());
return elements_[i];
}
T& operator[](intptr_t i) {
DCHECK_LT(i, GetLength());
return elements_[i];
}
const T& At(intptr_t i) const {
return (*this)[i];
}
void SetAt(intptr_t i, const T& val) {
(*this)[i] = val;
}
private:
T elements_[N];
};
template<typename T>
class EmbeddedArray<T, 0> {
public:
intptr_t length() const { return 0; }
const T& operator[](intptr_t i) const {
LOG(FATAL) << "Unreachable";
static T sentinel = 0;
return sentinel;
}
T& operator[](intptr_t i) {
LOG(FATAL) << "Unreachable";
static T sentinel = 0;
return sentinel;
}
};
template<intptr_t N>
class HTemplateInstruction: public HInstruction {
public:
HTemplateInstruction<N>() : inputs_() { }
virtual ~HTemplateInstruction() { }
virtual size_t InputCount() const { return N; }
virtual HInstruction* InputAt(size_t i) const { return inputs_[i]; }
protected:
virtual void SetRawInputAt(size_t i, HInstruction* instruction) {
inputs_[i] = instruction;
}
private:
EmbeddedArray<HInstruction*, N> inputs_;
friend class SsaBuilder;
};
// Represents dex's RETURN_VOID opcode. A HReturnVoid is a control flow
// instruction that branches to the exit block.
class HReturnVoid : public HTemplateInstruction<0> {
public:
HReturnVoid() { }
DECLARE_INSTRUCTION(ReturnVoid);
private:
DISALLOW_COPY_AND_ASSIGN(HReturnVoid);
};
// Represents dex's RETURN opcodes. A HReturn is a control flow
// instruction that branches to the exit block.
class HReturn : public HTemplateInstruction<1> {
public:
explicit HReturn(HInstruction* value) {
SetRawInputAt(0, value);
}
DECLARE_INSTRUCTION(Return);
private:
DISALLOW_COPY_AND_ASSIGN(HReturn);
};
// The exit instruction is the only instruction of the exit block.
// Instructions aborting the method (HTrow and HReturn) must branch to the
// exit block.
class HExit : public HTemplateInstruction<0> {
public:
HExit() { }
DECLARE_INSTRUCTION(Exit);
private:
DISALLOW_COPY_AND_ASSIGN(HExit);
};
// Jumps from one block to another.
class HGoto : public HTemplateInstruction<0> {
public:
HGoto() { }
HBasicBlock* GetSuccessor() const {
return GetBlock()->GetSuccessors().Get(0);
}
DECLARE_INSTRUCTION(Goto);
private:
DISALLOW_COPY_AND_ASSIGN(HGoto);
};
// Conditional branch. A block ending with an HIf instruction must have
// two successors.
class HIf : public HTemplateInstruction<1> {
public:
explicit HIf(HInstruction* input) {
SetRawInputAt(0, input);
}
HBasicBlock* IfTrueSuccessor() const {
return GetBlock()->GetSuccessors().Get(0);
}
HBasicBlock* IfFalseSuccessor() const {
return GetBlock()->GetSuccessors().Get(1);
}
DECLARE_INSTRUCTION(If);
private:
DISALLOW_COPY_AND_ASSIGN(HIf);
};
class HBinaryOperation : public HTemplateInstruction<2> {
public:
HBinaryOperation(Primitive::Type result_type,
HInstruction* left,
HInstruction* right) : result_type_(result_type) {
SetRawInputAt(0, left);
SetRawInputAt(1, right);
}
HInstruction* GetLeft() const { return InputAt(0); }
HInstruction* GetRight() const { return InputAt(1); }
Primitive::Type GetResultType() const { return result_type_; }
virtual bool IsCommutative() { return false; }
virtual Primitive::Type GetType() const { return GetResultType(); }
private:
const Primitive::Type result_type_;
DISALLOW_COPY_AND_ASSIGN(HBinaryOperation);
};
// Instruction to check if two inputs are equal to each other.
class HEqual : public HBinaryOperation {
public:
HEqual(HInstruction* first, HInstruction* second)
: HBinaryOperation(Primitive::kPrimBoolean, first, second) {}
virtual bool IsCommutative() { return true; }
virtual Primitive::Type GetType() const { return Primitive::kPrimBoolean; }
DECLARE_INSTRUCTION(Equal);
private:
DISALLOW_COPY_AND_ASSIGN(HEqual);
};
// A local in the graph. Corresponds to a Dex register.
class HLocal : public HTemplateInstruction<0> {
public:
explicit HLocal(uint16_t reg_number) : reg_number_(reg_number) { }
DECLARE_INSTRUCTION(Local);
uint16_t GetRegNumber() const { return reg_number_; }
private:
// The Dex register number.
const uint16_t reg_number_;
DISALLOW_COPY_AND_ASSIGN(HLocal);
};
// Load a given local. The local is an input of this instruction.
class HLoadLocal : public HTemplateInstruction<1> {
public:
explicit HLoadLocal(HLocal* local, Primitive::Type type) : type_(type) {
SetRawInputAt(0, local);
}
virtual Primitive::Type GetType() const { return type_; }
HLocal* GetLocal() const { return reinterpret_cast<HLocal*>(InputAt(0)); }
DECLARE_INSTRUCTION(LoadLocal);
private:
const Primitive::Type type_;
DISALLOW_COPY_AND_ASSIGN(HLoadLocal);
};
// Store a value in a given local. This instruction has two inputs: the value
// and the local.
class HStoreLocal : public HTemplateInstruction<2> {
public:
HStoreLocal(HLocal* local, HInstruction* value) {
SetRawInputAt(0, local);
SetRawInputAt(1, value);
}
HLocal* GetLocal() const { return reinterpret_cast<HLocal*>(InputAt(0)); }
DECLARE_INSTRUCTION(StoreLocal);
private:
DISALLOW_COPY_AND_ASSIGN(HStoreLocal);
};
// Constants of the type int. Those can be from Dex instructions, or
// synthesized (for example with the if-eqz instruction).
class HIntConstant : public HTemplateInstruction<0> {
public:
explicit HIntConstant(int32_t value) : value_(value) { }
int32_t GetValue() const { return value_; }
virtual Primitive::Type GetType() const { return Primitive::kPrimInt; }
DECLARE_INSTRUCTION(IntConstant);
private:
const int32_t value_;
DISALLOW_COPY_AND_ASSIGN(HIntConstant);
};
class HLongConstant : public HTemplateInstruction<0> {
public:
explicit HLongConstant(int64_t value) : value_(value) { }
int64_t GetValue() const { return value_; }
virtual Primitive::Type GetType() const { return Primitive::kPrimLong; }
DECLARE_INSTRUCTION(LongConstant);
private:
const int64_t value_;
DISALLOW_COPY_AND_ASSIGN(HLongConstant);
};
class HInvoke : public HInstruction {
public:
HInvoke(ArenaAllocator* arena,
uint32_t number_of_arguments,
Primitive::Type return_type,
uint32_t dex_pc)
: inputs_(arena, number_of_arguments),
return_type_(return_type),
dex_pc_(dex_pc) {
inputs_.SetSize(number_of_arguments);
}
virtual size_t InputCount() const { return inputs_.Size(); }
virtual HInstruction* InputAt(size_t i) const { return inputs_.Get(i); }
// Runtime needs to walk the stack, so Dex -> Dex calls need to
// know their environment.
virtual bool NeedsEnvironment() const { return true; }
void SetArgumentAt(size_t index, HInstruction* argument) {
SetRawInputAt(index, argument);
}
virtual void SetRawInputAt(size_t index, HInstruction* input) {
inputs_.Put(index, input);
}
virtual Primitive::Type GetType() const { return return_type_; }
uint32_t GetDexPc() const { return dex_pc_; }
protected:
GrowableArray<HInstruction*> inputs_;
const Primitive::Type return_type_;
const uint32_t dex_pc_;
private:
DISALLOW_COPY_AND_ASSIGN(HInvoke);
};
class HInvokeStatic : public HInvoke {
public:
HInvokeStatic(ArenaAllocator* arena,
uint32_t number_of_arguments,
Primitive::Type return_type,
uint32_t dex_pc,
uint32_t index_in_dex_cache)
: HInvoke(arena, number_of_arguments, return_type, dex_pc),
index_in_dex_cache_(index_in_dex_cache) {}
uint32_t GetIndexInDexCache() const { return index_in_dex_cache_; }
DECLARE_INSTRUCTION(InvokeStatic);
private:
const uint32_t index_in_dex_cache_;
DISALLOW_COPY_AND_ASSIGN(HInvokeStatic);
};
class HNewInstance : public HTemplateInstruction<0> {
public:
HNewInstance(uint32_t dex_pc, uint16_t type_index) : dex_pc_(dex_pc), type_index_(type_index) {}
uint32_t GetDexPc() const { return dex_pc_; }
uint16_t GetTypeIndex() const { return type_index_; }
virtual Primitive::Type GetType() const { return Primitive::kPrimNot; }
// Calls runtime so needs an environment.
virtual bool NeedsEnvironment() const { return true; }
DECLARE_INSTRUCTION(NewInstance);
private:
const uint32_t dex_pc_;
const uint16_t type_index_;
DISALLOW_COPY_AND_ASSIGN(HNewInstance);
};
class HAdd : public HBinaryOperation {
public:
HAdd(Primitive::Type result_type, HInstruction* left, HInstruction* right)
: HBinaryOperation(result_type, left, right) {}
virtual bool IsCommutative() { return true; }
DECLARE_INSTRUCTION(Add);
private:
DISALLOW_COPY_AND_ASSIGN(HAdd);
};
class HSub : public HBinaryOperation {
public:
HSub(Primitive::Type result_type, HInstruction* left, HInstruction* right)
: HBinaryOperation(result_type, left, right) {}
virtual bool IsCommutative() { return false; }
DECLARE_INSTRUCTION(Sub);
private:
DISALLOW_COPY_AND_ASSIGN(HSub);
};
// The value of a parameter in this method. Its location depends on
// the calling convention.
class HParameterValue : public HTemplateInstruction<0> {
public:
HParameterValue(uint8_t index, Primitive::Type parameter_type)
: index_(index), parameter_type_(parameter_type) {}
uint8_t GetIndex() const { return index_; }
virtual Primitive::Type GetType() const { return parameter_type_; }
DECLARE_INSTRUCTION(ParameterValue);
private:
// The index of this parameter in the parameters list. Must be less
// than HGraph::number_of_in_vregs_;
const uint8_t index_;
const Primitive::Type parameter_type_;
DISALLOW_COPY_AND_ASSIGN(HParameterValue);
};
class HNot : public HTemplateInstruction<1> {
public:
explicit HNot(HInstruction* input) {
SetRawInputAt(0, input);
}
virtual Primitive::Type GetType() const { return Primitive::kPrimBoolean; }
DECLARE_INSTRUCTION(Not);
private:
DISALLOW_COPY_AND_ASSIGN(HNot);
};
class HPhi : public HInstruction {
public:
HPhi(ArenaAllocator* arena, uint32_t reg_number, size_t number_of_inputs, Primitive::Type type)
: inputs_(arena, number_of_inputs),
reg_number_(reg_number),
type_(type) {
inputs_.SetSize(number_of_inputs);
}
virtual size_t InputCount() const { return inputs_.Size(); }
virtual HInstruction* InputAt(size_t i) const { return inputs_.Get(i); }
virtual void SetRawInputAt(size_t index, HInstruction* input) {
inputs_.Put(index, input);
}
void AddInput(HInstruction* input);
virtual Primitive::Type GetType() const { return type_; }
void SetType(Primitive::Type type) { type_ = type; }
uint32_t GetRegNumber() const { return reg_number_; }
DECLARE_INSTRUCTION(Phi);
protected:
GrowableArray<HInstruction*> inputs_;
const uint32_t reg_number_;
Primitive::Type type_;
private:
DISALLOW_COPY_AND_ASSIGN(HPhi);
};
class MoveOperands : public ArenaObject {
public:
MoveOperands(Location source, Location destination)
: source_(source), destination_(destination) {}
Location GetSource() const { return source_; }
Location GetDestination() const { return destination_; }
void SetSource(Location value) { source_ = value; }
void SetDestination(Location value) { destination_ = value; }
// The parallel move resolver marks moves as "in-progress" by clearing the
// destination (but not the source).
Location MarkPending() {
DCHECK(!IsPending());
Location dest = destination_;
destination_ = Location::NoLocation();
return dest;
}
void ClearPending(Location dest) {
DCHECK(IsPending());
destination_ = dest;
}
bool IsPending() const {
DCHECK(!source_.IsInvalid() || destination_.IsInvalid());
return destination_.IsInvalid() && !source_.IsInvalid();
}
// True if this blocks a move from the given location.
bool Blocks(Location loc) const {
return !IsEliminated() && source_.Equals(loc);
}
// A move is redundant if it's been eliminated, if its source and
// destination are the same, or if its destination is unneeded.
bool IsRedundant() const {
return IsEliminated() || destination_.IsInvalid() || source_.Equals(destination_);
}
// We clear both operands to indicate move that's been eliminated.
void Eliminate() {
source_ = destination_ = Location::NoLocation();
}
bool IsEliminated() const {
DCHECK(!source_.IsInvalid() || destination_.IsInvalid());
return source_.IsInvalid();
}
private:
Location source_;
Location destination_;
DISALLOW_COPY_AND_ASSIGN(MoveOperands);
};
static constexpr size_t kDefaultNumberOfMoves = 4;
class HParallelMove : public HTemplateInstruction<0> {
public:
explicit HParallelMove(ArenaAllocator* arena) : moves_(arena, kDefaultNumberOfMoves) {}
void AddMove(MoveOperands* move) {
moves_.Add(move);
}
MoveOperands* MoveOperandsAt(size_t index) const {
return moves_.Get(index);
}
size_t NumMoves() const { return moves_.Size(); }
DECLARE_INSTRUCTION(ParallelMove);
private:
GrowableArray<MoveOperands*> moves_;
DISALLOW_COPY_AND_ASSIGN(HParallelMove);
};
class HGraphVisitor : public ValueObject {
public:
explicit HGraphVisitor(HGraph* graph) : graph_(graph) { }
virtual ~HGraphVisitor() { }
virtual void VisitInstruction(HInstruction* instruction) { }
virtual void VisitBasicBlock(HBasicBlock* block);
void VisitInsertionOrder();
HGraph* GetGraph() const { return graph_; }
// Visit functions for instruction classes.
#define DECLARE_VISIT_INSTRUCTION(name) \
virtual void Visit##name(H##name* instr) { VisitInstruction(instr); }
FOR_EACH_INSTRUCTION(DECLARE_VISIT_INSTRUCTION)
#undef DECLARE_VISIT_INSTRUCTION
private:
HGraph* graph_;
DISALLOW_COPY_AND_ASSIGN(HGraphVisitor);
};
class HInsertionOrderIterator : public ValueObject {
public:
explicit HInsertionOrderIterator(const HGraph& graph) : graph_(graph), index_(0) {}
bool Done() const { return index_ == graph_.GetBlocks().Size(); }
HBasicBlock* Current() const { return graph_.GetBlocks().Get(index_); }
void Advance() { ++index_; }
private:
const HGraph& graph_;
size_t index_;
DISALLOW_COPY_AND_ASSIGN(HInsertionOrderIterator);
};
class HReversePostOrderIterator : public ValueObject {
public:
explicit HReversePostOrderIterator(const HGraph& graph) : graph_(graph), index_(0) {}
bool Done() const { return index_ == graph_.GetReversePostOrder().Size(); }
HBasicBlock* Current() const { return graph_.GetReversePostOrder().Get(index_); }
void Advance() { ++index_; }
private:
const HGraph& graph_;
size_t index_;
DISALLOW_COPY_AND_ASSIGN(HReversePostOrderIterator);
};
class HPostOrderIterator : public ValueObject {
public:
explicit HPostOrderIterator(const HGraph& graph)
: graph_(graph), index_(graph_.GetReversePostOrder().Size()) {}
bool Done() const { return index_ == 0; }
HBasicBlock* Current() const { return graph_.GetReversePostOrder().Get(index_ - 1); }
void Advance() { --index_; }
private:
const HGraph& graph_;
size_t index_;
DISALLOW_COPY_AND_ASSIGN(HPostOrderIterator);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_NODES_H_