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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_CRANKSHAFT_ARM64_LITHIUM_CODEGEN_ARM64_H_
#define V8_CRANKSHAFT_ARM64_LITHIUM_CODEGEN_ARM64_H_
#include "src/crankshaft/arm64/lithium-arm64.h"
#include "src/ast/scopes.h"
#include "src/crankshaft/arm64/lithium-gap-resolver-arm64.h"
#include "src/crankshaft/lithium-codegen.h"
#include "src/deoptimizer.h"
#include "src/safepoint-table.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
// Forward declarations.
class LDeferredCode;
class SafepointGenerator;
class BranchGenerator;
class LCodeGen: public LCodeGenBase {
public:
LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
: LCodeGenBase(chunk, assembler, info),
jump_table_(4, info->zone()),
scope_(info->scope()),
deferred_(8, info->zone()),
frame_is_built_(false),
safepoints_(info->zone()),
resolver_(this),
expected_safepoint_kind_(Safepoint::kSimple),
pushed_arguments_(0) {
PopulateDeoptimizationLiteralsWithInlinedFunctions();
}
// Simple accessors.
Scope* scope() const { return scope_; }
int LookupDestination(int block_id) const {
return chunk()->LookupDestination(block_id);
}
bool IsNextEmittedBlock(int block_id) const {
return LookupDestination(block_id) == GetNextEmittedBlock();
}
bool NeedsEagerFrame() const {
return HasAllocatedStackSlots() || info()->is_non_deferred_calling() ||
!info()->IsStub() || info()->requires_frame();
}
bool NeedsDeferredFrame() const {
return !NeedsEagerFrame() && info()->is_deferred_calling();
}
LinkRegisterStatus GetLinkRegisterState() const {
return frame_is_built_ ? kLRHasBeenSaved : kLRHasNotBeenSaved;
}
// Try to generate code for the entire chunk, but it may fail if the
// chunk contains constructs we cannot handle. Returns true if the
// code generation attempt succeeded.
bool GenerateCode();
// Finish the code by setting stack height, safepoint, and bailout
// information on it.
void FinishCode(Handle<Code> code);
enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
// Support for converting LOperands to assembler types.
Register ToRegister(LOperand* op) const;
Register ToRegister32(LOperand* op) const;
Operand ToOperand(LOperand* op);
Operand ToOperand32(LOperand* op);
enum StackMode { kMustUseFramePointer, kCanUseStackPointer };
MemOperand ToMemOperand(LOperand* op,
StackMode stack_mode = kCanUseStackPointer) const;
Handle<Object> ToHandle(LConstantOperand* op) const;
template <class LI>
Operand ToShiftedRightOperand32(LOperand* right, LI* shift_info);
int JSShiftAmountFromLConstant(LOperand* constant) {
return ToInteger32(LConstantOperand::cast(constant)) & 0x1f;
}
// TODO(jbramley): Examine these helpers and check that they make sense.
// IsInteger32Constant returns true for smi constants, for example.
bool IsInteger32Constant(LConstantOperand* op) const;
bool IsSmi(LConstantOperand* op) const;
int32_t ToInteger32(LConstantOperand* op) const;
Smi* ToSmi(LConstantOperand* op) const;
double ToDouble(LConstantOperand* op) const;
DoubleRegister ToDoubleRegister(LOperand* op) const;
// Declare methods that deal with the individual node types.
#define DECLARE_DO(type) void Do##type(L##type* node);
LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
#undef DECLARE_DO
private:
// Return a double scratch register which can be used locally
// when generating code for a lithium instruction.
DoubleRegister double_scratch() { return crankshaft_fp_scratch; }
// Deferred code support.
void DoDeferredNumberTagD(LNumberTagD* instr);
void DoDeferredStackCheck(LStackCheck* instr);
void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
void DoDeferredMathAbsTagged(LMathAbsTagged* instr,
Label* exit,
Label* allocation_entry);
void DoDeferredNumberTagU(LInstruction* instr,
LOperand* value,
LOperand* temp1,
LOperand* temp2);
void DoDeferredTaggedToI(LTaggedToI* instr,
LOperand* value,
LOperand* temp1,
LOperand* temp2);
void DoDeferredAllocate(LAllocate* instr);
void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
Register result,
Register object,
Register index);
static Condition TokenToCondition(Token::Value op, bool is_unsigned);
void EmitGoto(int block);
void DoGap(LGap* instr);
// Generic version of EmitBranch. It contains some code to avoid emitting a
// branch on the next emitted basic block where we could just fall-through.
// You shouldn't use that directly but rather consider one of the helper like
// LCodeGen::EmitBranch, LCodeGen::EmitCompareAndBranch...
template<class InstrType>
void EmitBranchGeneric(InstrType instr,
const BranchGenerator& branch);
template<class InstrType>
void EmitBranch(InstrType instr, Condition condition);
template<class InstrType>
void EmitCompareAndBranch(InstrType instr,
Condition condition,
const Register& lhs,
const Operand& rhs);
template<class InstrType>
void EmitTestAndBranch(InstrType instr,
Condition condition,
const Register& value,
uint64_t mask);
template<class InstrType>
void EmitBranchIfNonZeroNumber(InstrType instr,
const FPRegister& value,
const FPRegister& scratch);
template<class InstrType>
void EmitBranchIfHeapNumber(InstrType instr,
const Register& value);
template<class InstrType>
void EmitBranchIfRoot(InstrType instr,
const Register& value,
Heap::RootListIndex index);
// Emits optimized code to deep-copy the contents of statically known object
// graphs (e.g. object literal boilerplate). Expects a pointer to the
// allocated destination object in the result register, and a pointer to the
// source object in the source register.
void EmitDeepCopy(Handle<JSObject> object,
Register result,
Register source,
Register scratch,
int* offset,
AllocationSiteMode mode);
template <class T>
void EmitVectorLoadICRegisters(T* instr);
// Emits optimized code for %_IsString(x). Preserves input register.
// Returns the condition on which a final split to
// true and false label should be made, to optimize fallthrough.
Condition EmitIsString(Register input, Register temp1, Label* is_not_string,
SmiCheck check_needed);
MemOperand BuildSeqStringOperand(Register string,
Register temp,
LOperand* index,
String::Encoding encoding);
void DeoptimizeBranch(LInstruction* instr, DeoptimizeReason deopt_reason,
BranchType branch_type, Register reg = NoReg,
int bit = -1,
Deoptimizer::BailoutType* override_bailout_type = NULL);
void Deoptimize(LInstruction* instr, DeoptimizeReason deopt_reason,
Deoptimizer::BailoutType* override_bailout_type = NULL);
void DeoptimizeIf(Condition cond, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfZero(Register rt, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfNotZero(Register rt, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfNegative(Register rt, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfSmi(Register rt, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfNotSmi(Register rt, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfRoot(Register rt, Heap::RootListIndex index,
LInstruction* instr, DeoptimizeReason deopt_reason);
void DeoptimizeIfNotRoot(Register rt, Heap::RootListIndex index,
LInstruction* instr, DeoptimizeReason deopt_reason);
void DeoptimizeIfNotHeapNumber(Register object, LInstruction* instr);
void DeoptimizeIfMinusZero(DoubleRegister input, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfBitSet(Register rt, int bit, LInstruction* instr,
DeoptimizeReason deopt_reason);
void DeoptimizeIfBitClear(Register rt, int bit, LInstruction* instr,
DeoptimizeReason deopt_reason);
MemOperand PrepareKeyedExternalArrayOperand(Register key,
Register base,
Register scratch,
bool key_is_smi,
bool key_is_constant,
int constant_key,
ElementsKind elements_kind,
int base_offset);
MemOperand PrepareKeyedArrayOperand(Register base,
Register elements,
Register key,
bool key_is_tagged,
ElementsKind elements_kind,
Representation representation,
int base_offset);
void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
Safepoint::DeoptMode mode);
bool HasAllocatedStackSlots() const {
return chunk()->HasAllocatedStackSlots();
}
int GetStackSlotCount() const { return chunk()->GetSpillSlotCount(); }
int GetTotalFrameSlotCount() const {
return chunk()->GetTotalFrameSlotCount();
}
void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
// Emit frame translation commands for an environment.
void WriteTranslation(LEnvironment* environment, Translation* translation);
void AddToTranslation(LEnvironment* environment,
Translation* translation,
LOperand* op,
bool is_tagged,
bool is_uint32,
int* object_index_pointer,
int* dematerialized_index_pointer);
void SaveCallerDoubles();
void RestoreCallerDoubles();
// Code generation steps. Returns true if code generation should continue.
void GenerateBodyInstructionPre(LInstruction* instr) override;
bool GeneratePrologue();
bool GenerateDeferredCode();
bool GenerateJumpTable();
bool GenerateSafepointTable();
// Generates the custom OSR entrypoint and sets the osr_pc_offset.
void GenerateOsrPrologue();
enum SafepointMode {
RECORD_SIMPLE_SAFEPOINT,
RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
};
void CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr);
void CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode);
void CallRuntime(const Runtime::Function* function,
int num_arguments,
LInstruction* instr,
SaveFPRegsMode save_doubles = kDontSaveFPRegs);
void CallRuntime(Runtime::FunctionId id,
int num_arguments,
LInstruction* instr) {
const Runtime::Function* function = Runtime::FunctionForId(id);
CallRuntime(function, num_arguments, instr);
}
void CallRuntime(Runtime::FunctionId id, LInstruction* instr) {
const Runtime::Function* function = Runtime::FunctionForId(id);
CallRuntime(function, function->nargs, instr);
}
void LoadContextFromDeferred(LOperand* context);
void CallRuntimeFromDeferred(Runtime::FunctionId id,
int argc,
LInstruction* instr,
LOperand* context);
void PrepareForTailCall(const ParameterCount& actual, Register scratch1,
Register scratch2, Register scratch3);
// Generate a direct call to a known function. Expects the function
// to be in x1.
void CallKnownFunction(Handle<JSFunction> function,
int formal_parameter_count, int arity,
bool is_tail_call, LInstruction* instr);
// Support for recording safepoint information.
void RecordSafepoint(LPointerMap* pointers,
Safepoint::Kind kind,
int arguments,
Safepoint::DeoptMode mode);
void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
void RecordSafepoint(Safepoint::DeoptMode mode);
void RecordSafepointWithRegisters(LPointerMap* pointers,
int arguments,
Safepoint::DeoptMode mode);
void RecordSafepointWithLazyDeopt(LInstruction* instr,
SafepointMode safepoint_mode);
void EnsureSpaceForLazyDeopt(int space_needed) override;
ZoneList<Deoptimizer::JumpTableEntry*> jump_table_;
Scope* const scope_;
ZoneList<LDeferredCode*> deferred_;
bool frame_is_built_;
// Builder that keeps track of safepoints in the code. The table itself is
// emitted at the end of the generated code.
SafepointTableBuilder safepoints_;
// Compiler from a set of parallel moves to a sequential list of moves.
LGapResolver resolver_;
Safepoint::Kind expected_safepoint_kind_;
// The number of arguments pushed onto the stack, either by this block or by a
// predecessor.
int pushed_arguments_;
void RecordPushedArgumentsDelta(int delta) {
pushed_arguments_ += delta;
DCHECK(pushed_arguments_ >= 0);
}
int old_position_;
class PushSafepointRegistersScope BASE_EMBEDDED {
public:
explicit PushSafepointRegistersScope(LCodeGen* codegen);
~PushSafepointRegistersScope();
private:
LCodeGen* codegen_;
};
friend class LDeferredCode;
friend class SafepointGenerator;
DISALLOW_COPY_AND_ASSIGN(LCodeGen);
};
class LDeferredCode: public ZoneObject {
public:
explicit LDeferredCode(LCodeGen* codegen)
: codegen_(codegen),
external_exit_(NULL),
instruction_index_(codegen->current_instruction_) {
codegen->AddDeferredCode(this);
}
virtual ~LDeferredCode() { }
virtual void Generate() = 0;
virtual LInstruction* instr() = 0;
void SetExit(Label* exit) { external_exit_ = exit; }
Label* entry() { return &entry_; }
Label* exit() { return (external_exit_ != NULL) ? external_exit_ : &exit_; }
int instruction_index() const { return instruction_index_; }
protected:
LCodeGen* codegen() const { return codegen_; }
MacroAssembler* masm() const { return codegen_->masm(); }
private:
LCodeGen* codegen_;
Label entry_;
Label exit_;
Label* external_exit_;
int instruction_index_;
};
// This is the abstract class used by EmitBranchGeneric.
// It is used to emit code for conditional branching. The Emit() function
// emits code to branch when the condition holds and EmitInverted() emits
// the branch when the inverted condition is verified.
//
// For actual examples of condition see the concrete implementation in
// lithium-codegen-arm64.cc (e.g. BranchOnCondition, CompareAndBranch).
class BranchGenerator BASE_EMBEDDED {
public:
explicit BranchGenerator(LCodeGen* codegen)
: codegen_(codegen) { }
virtual ~BranchGenerator() { }
virtual void Emit(Label* label) const = 0;
virtual void EmitInverted(Label* label) const = 0;
protected:
MacroAssembler* masm() const { return codegen_->masm(); }
LCodeGen* codegen_;
};
} // namespace internal
} // namespace v8
#endif // V8_CRANKSHAFT_ARM64_LITHIUM_CODEGEN_ARM64_H_