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chromium / v8 / v8 / b2c246e0a95d377de4c1ba20b8e67ed6c97300e6 / . / src / ppc / macro-assembler-ppc.h
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// Copyright 2014 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_PPC_MACRO_ASSEMBLER_PPC_H_
#define V8_PPC_MACRO_ASSEMBLER_PPC_H_
#include "src/assembler.h"
#include "src/bailout-reason.h"
#include "src/frames.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
// Give alias names to registers for calling conventions.
const Register kReturnRegister0 = {Register::kCode_r3};
const Register kReturnRegister1 = {Register::kCode_r4};
const Register kReturnRegister2 = {Register::kCode_r5};
const Register kJSFunctionRegister = {Register::kCode_r4};
const Register kContextRegister = {Register::kCode_r30};
const Register kInterpreterAccumulatorRegister = {Register::kCode_r3};
const Register kInterpreterRegisterFileRegister = {Register::kCode_r14};
const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_r15};
const Register kInterpreterBytecodeArrayRegister = {Register::kCode_r16};
const Register kInterpreterDispatchTableRegister = {Register::kCode_r17};
const Register kJavaScriptCallArgCountRegister = {Register::kCode_r3};
const Register kJavaScriptCallNewTargetRegister = {Register::kCode_r6};
const Register kRuntimeCallFunctionRegister = {Register::kCode_r4};
const Register kRuntimeCallArgCountRegister = {Register::kCode_r3};
// ----------------------------------------------------------------------------
// Static helper functions
// Generate a MemOperand for loading a field from an object.
inline MemOperand FieldMemOperand(Register object, int offset) {
return MemOperand(object, offset - kHeapObjectTag);
}
// Flags used for AllocateHeapNumber
enum TaggingMode {
// Tag the result.
TAG_RESULT,
// Don't tag
DONT_TAG_RESULT
};
enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
enum PointersToHereCheck {
kPointersToHereMaybeInteresting,
kPointersToHereAreAlwaysInteresting
};
enum LinkRegisterStatus { kLRHasNotBeenSaved, kLRHasBeenSaved };
Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2 = no_reg,
Register reg3 = no_reg,
Register reg4 = no_reg,
Register reg5 = no_reg,
Register reg6 = no_reg);
#ifdef DEBUG
bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg,
Register reg4 = no_reg, Register reg5 = no_reg,
Register reg6 = no_reg, Register reg7 = no_reg,
Register reg8 = no_reg, Register reg9 = no_reg,
Register reg10 = no_reg);
#endif
// These exist to provide portability between 32 and 64bit
#if V8_TARGET_ARCH_PPC64
#define LoadPU ldu
#define LoadPX ldx
#define LoadPUX ldux
#define StorePU stdu
#define StorePX stdx
#define StorePUX stdux
#define ShiftLeftImm sldi
#define ShiftRightImm srdi
#define ClearLeftImm clrldi
#define ClearRightImm clrrdi
#define ShiftRightArithImm sradi
#define ShiftLeft_ sld
#define ShiftRight_ srd
#define ShiftRightArith srad
#define Mul mulld
#define Div divd
#else
#define LoadPU lwzu
#define LoadPX lwzx
#define LoadPUX lwzux
#define StorePU stwu
#define StorePX stwx
#define StorePUX stwux
#define ShiftLeftImm slwi
#define ShiftRightImm srwi
#define ClearLeftImm clrlwi
#define ClearRightImm clrrwi
#define ShiftRightArithImm srawi
#define ShiftLeft_ slw
#define ShiftRight_ srw
#define ShiftRightArith sraw
#define Mul mullw
#define Div divw
#endif
// MacroAssembler implements a collection of frequently used macros.
class MacroAssembler : public Assembler {
public:
MacroAssembler(Isolate* isolate, void* buffer, int size,
CodeObjectRequired create_code_object);
// Returns the size of a call in instructions. Note, the value returned is
// only valid as long as no entries are added to the constant pool between
// checking the call size and emitting the actual call.
static int CallSize(Register target);
int CallSize(Address target, RelocInfo::Mode rmode, Condition cond = al);
static int CallSizeNotPredictableCodeSize(Address target,
RelocInfo::Mode rmode,
Condition cond = al);
// Jump, Call, and Ret pseudo instructions implementing inter-working.
void Jump(Register target);
void JumpToJSEntry(Register target);
void Jump(Address target, RelocInfo::Mode rmode, Condition cond = al,
CRegister cr = cr7);
void Jump(Handle<Code> code, RelocInfo::Mode rmode, Condition cond = al);
void Call(Register target);
void CallJSEntry(Register target);
void Call(Address target, RelocInfo::Mode rmode, Condition cond = al);
int CallSize(Handle<Code> code,
RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
TypeFeedbackId ast_id = TypeFeedbackId::None(),
Condition cond = al);
void Call(Handle<Code> code, RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
TypeFeedbackId ast_id = TypeFeedbackId::None(),
Condition cond = al);
void Ret() { blr(); }
void Ret(Condition cond, CRegister cr = cr7) { bclr(cond, cr); }
// Emit code to discard a non-negative number of pointer-sized elements
// from the stack, clobbering only the sp register.
void Drop(int count);
void Ret(int drop) {
Drop(drop);
blr();
}
void Call(Label* target);
// Emit call to the code we are currently generating.
void CallSelf() {
Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
Call(self, RelocInfo::CODE_TARGET);
}
// Register move. May do nothing if the registers are identical.
void Move(Register dst, Handle<Object> value);
void Move(Register dst, Register src, Condition cond = al);
void Move(DoubleRegister dst, DoubleRegister src);
void MultiPush(RegList regs, Register location = sp);
void MultiPop(RegList regs, Register location = sp);
void MultiPushDoubles(RegList dregs, Register location = sp);
void MultiPopDoubles(RegList dregs, Register location = sp);
// Load an object from the root table.
void LoadRoot(Register destination, Heap::RootListIndex index,
Condition cond = al);
// Store an object to the root table.
void StoreRoot(Register source, Heap::RootListIndex index,
Condition cond = al);
// ---------------------------------------------------------------------------
// GC Support
void IncrementalMarkingRecordWriteHelper(Register object, Register value,
Register address);
enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd };
// Record in the remembered set the fact that we have a pointer to new space
// at the address pointed to by the addr register. Only works if addr is not
// in new space.
void RememberedSetHelper(Register object, // Used for debug code.
Register addr, Register scratch,
SaveFPRegsMode save_fp,
RememberedSetFinalAction and_then);
void CheckPageFlag(Register object, Register scratch, int mask, Condition cc,
Label* condition_met);
// Check if object is in new space. Jumps if the object is not in new space.
// The register scratch can be object itself, but scratch will be clobbered.
void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch) {
InNewSpace(object, scratch, ne, branch);
}
// Check if object is in new space. Jumps if the object is in new space.
// The register scratch can be object itself, but it will be clobbered.
void JumpIfInNewSpace(Register object, Register scratch, Label* branch) {
InNewSpace(object, scratch, eq, branch);
}
// Check if an object has a given incremental marking color.
void HasColor(Register object, Register scratch0, Register scratch1,
Label* has_color, int first_bit, int second_bit);
void JumpIfBlack(Register object, Register scratch0, Register scratch1,
Label* on_black);
// Checks the color of an object. If the object is white we jump to the
// incremental marker.
void JumpIfWhite(Register value, Register scratch1, Register scratch2,
Register scratch3, Label* value_is_white);
// Notify the garbage collector that we wrote a pointer into an object.
// |object| is the object being stored into, |value| is the object being
// stored. value and scratch registers are clobbered by the operation.
// The offset is the offset from the start of the object, not the offset from
// the tagged HeapObject pointer. For use with FieldMemOperand(reg, off).
void RecordWriteField(
Register object, int offset, Register value, Register scratch,
LinkRegisterStatus lr_status, SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting);
// As above, but the offset has the tag presubtracted. For use with
// MemOperand(reg, off).
inline void RecordWriteContextSlot(
Register context, int offset, Register value, Register scratch,
LinkRegisterStatus lr_status, SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting) {
RecordWriteField(context, offset + kHeapObjectTag, value, scratch,
lr_status, save_fp, remembered_set_action, smi_check,
pointers_to_here_check_for_value);
}
void RecordWriteForMap(Register object, Register map, Register dst,
LinkRegisterStatus lr_status, SaveFPRegsMode save_fp);
// For a given |object| notify the garbage collector that the slot |address|
// has been written. |value| is the object being stored. The value and
// address registers are clobbered by the operation.
void RecordWrite(
Register object, Register address, Register value,
LinkRegisterStatus lr_status, SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting);
void Push(Register src) { push(src); }
// Push a handle.
void Push(Handle<Object> handle);
void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }
// Push two registers. Pushes leftmost register first (to highest address).
void Push(Register src1, Register src2) {
StorePU(src2, MemOperand(sp, -2 * kPointerSize));
StoreP(src1, MemOperand(sp, kPointerSize));
}
// Push three registers. Pushes leftmost register first (to highest address).
void Push(Register src1, Register src2, Register src3) {
StorePU(src3, MemOperand(sp, -3 * kPointerSize));
StoreP(src2, MemOperand(sp, kPointerSize));
StoreP(src1, MemOperand(sp, 2 * kPointerSize));
}
// Push four registers. Pushes leftmost register first (to highest address).
void Push(Register src1, Register src2, Register src3, Register src4) {
StorePU(src4, MemOperand(sp, -4 * kPointerSize));
StoreP(src3, MemOperand(sp, kPointerSize));
StoreP(src2, MemOperand(sp, 2 * kPointerSize));
StoreP(src1, MemOperand(sp, 3 * kPointerSize));
}
// Push five registers. Pushes leftmost register first (to highest address).
void Push(Register src1, Register src2, Register src3, Register src4,
Register src5) {
StorePU(src5, MemOperand(sp, -5 * kPointerSize));
StoreP(src4, MemOperand(sp, kPointerSize));
StoreP(src3, MemOperand(sp, 2 * kPointerSize));
StoreP(src2, MemOperand(sp, 3 * kPointerSize));
StoreP(src1, MemOperand(sp, 4 * kPointerSize));
}
void Pop(Register dst) { pop(dst); }
// Pop two registers. Pops rightmost register first (from lower address).
void Pop(Register src1, Register src2) {
LoadP(src2, MemOperand(sp, 0));
LoadP(src1, MemOperand(sp, kPointerSize));
addi(sp, sp, Operand(2 * kPointerSize));
}
// Pop three registers. Pops rightmost register first (from lower address).
void Pop(Register src1, Register src2, Register src3) {
LoadP(src3, MemOperand(sp, 0));
LoadP(src2, MemOperand(sp, kPointerSize));
LoadP(src1, MemOperand(sp, 2 * kPointerSize));
addi(sp, sp, Operand(3 * kPointerSize));
}
// Pop four registers. Pops rightmost register first (from lower address).
void Pop(Register src1, Register src2, Register src3, Register src4) {
LoadP(src4, MemOperand(sp, 0));
LoadP(src3, MemOperand(sp, kPointerSize));
LoadP(src2, MemOperand(sp, 2 * kPointerSize));
LoadP(src1, MemOperand(sp, 3 * kPointerSize));
addi(sp, sp, Operand(4 * kPointerSize));
}
// Pop five registers. Pops rightmost register first (from lower address).
void Pop(Register src1, Register src2, Register src3, Register src4,
Register src5) {
LoadP(src5, MemOperand(sp, 0));
LoadP(src4, MemOperand(sp, kPointerSize));
LoadP(src3, MemOperand(sp, 2 * kPointerSize));
LoadP(src2, MemOperand(sp, 3 * kPointerSize));
LoadP(src1, MemOperand(sp, 4 * kPointerSize));
addi(sp, sp, Operand(5 * kPointerSize));
}
// Push a fixed frame, consisting of lr, fp, context and
// JS function / marker id if marker_reg is a valid register.
void PushFixedFrame(Register marker_reg = no_reg);
void PopFixedFrame(Register marker_reg = no_reg);
// Push and pop the registers that can hold pointers, as defined by the
// RegList constant kSafepointSavedRegisters.
void PushSafepointRegisters();
void PopSafepointRegisters();
// Store value in register src in the safepoint stack slot for
// register dst.
void StoreToSafepointRegisterSlot(Register src, Register dst);
// Load the value of the src register from its safepoint stack slot
// into register dst.
void LoadFromSafepointRegisterSlot(Register dst, Register src);
// Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
// from C.
// Does not handle errors.
void FlushICache(Register address, size_t size, Register scratch);
// If the value is a NaN, canonicalize the value else, do nothing.
void CanonicalizeNaN(const DoubleRegister dst, const DoubleRegister src);
void CanonicalizeNaN(const DoubleRegister value) {
CanonicalizeNaN(value, value);
}
// Converts the integer (untagged smi) in |src| to a double, storing
// the result to |double_dst|
void ConvertIntToDouble(Register src, DoubleRegister double_dst);
// Converts the unsigned integer (untagged smi) in |src| to
// a double, storing the result to |double_dst|
void ConvertUnsignedIntToDouble(Register src, DoubleRegister double_dst);
// Converts the integer (untagged smi) in |src| to
// a float, storing the result in |dst|
// Warning: The value in |int_scrach| will be changed in the process!
void ConvertIntToFloat(const DoubleRegister dst, const Register src,
const Register int_scratch);
#if V8_TARGET_ARCH_PPC64
void ConvertInt64ToFloat(Register src, DoubleRegister double_dst);
void ConvertInt64ToDouble(Register src, DoubleRegister double_dst);
void ConvertUnsignedInt64ToFloat(Register src, DoubleRegister double_dst);
void ConvertUnsignedInt64ToDouble(Register src, DoubleRegister double_dst);
#endif
// Converts the double_input to an integer. Note that, upon return,
// the contents of double_dst will also hold the fixed point representation.
void ConvertDoubleToInt64(const DoubleRegister double_input,
#if !V8_TARGET_ARCH_PPC64
const Register dst_hi,
#endif
const Register dst, const DoubleRegister double_dst,
FPRoundingMode rounding_mode = kRoundToZero);
#if V8_TARGET_ARCH_PPC64
// Converts the double_input to an unsigned integer. Note that, upon return,
// the contents of double_dst will also hold the fixed point representation.
void ConvertDoubleToUnsignedInt64(
const DoubleRegister double_input, const Register dst,
const DoubleRegister double_dst,
FPRoundingMode rounding_mode = kRoundToZero);
#endif
// Generates function and stub prologue code.
void StubPrologue(Register base = no_reg, int prologue_offset = 0);
void Prologue(bool code_pre_aging, Register base, int prologue_offset = 0);
// Enter exit frame.
// stack_space - extra stack space, used for parameters before call to C.
// At least one slot (for the return address) should be provided.
void EnterExitFrame(bool save_doubles, int stack_space = 1);
// Leave the current exit frame. Expects the return value in r0.
// Expect the number of values, pushed prior to the exit frame, to
// remove in a register (or no_reg, if there is nothing to remove).
void LeaveExitFrame(bool save_doubles, Register argument_count,
bool restore_context,
bool argument_count_is_length = false);
// Get the actual activation frame alignment for target environment.
static int ActivationFrameAlignment();
void LoadContext(Register dst, int context_chain_length);
// Load the global object from the current context.
void LoadGlobalObject(Register dst) {
LoadNativeContextSlot(Context::EXTENSION_INDEX, dst);
}
// Load the global proxy from the current context.
void LoadGlobalProxy(Register dst) {
LoadNativeContextSlot(Context::GLOBAL_PROXY_INDEX, dst);
}
// Conditionally load the cached Array transitioned map of type
// transitioned_kind from the native context if the map in register
// map_in_out is the cached Array map in the native context of
// expected_kind.
void LoadTransitionedArrayMapConditional(ElementsKind expected_kind,
ElementsKind transitioned_kind,
Register map_in_out,
Register scratch,
Label* no_map_match);
void LoadNativeContextSlot(int index, Register dst);
// Load the initial map from the global function. The registers
// function and map can be the same, function is then overwritten.
void LoadGlobalFunctionInitialMap(Register function, Register map,
Register scratch);
void InitializeRootRegister() {
ExternalReference roots_array_start =
ExternalReference::roots_array_start(isolate());
mov(kRootRegister, Operand(roots_array_start));
}
// ----------------------------------------------------------------
// new PPC macro-assembler interfaces that are slightly higher level
// than assembler-ppc and may generate variable length sequences
// load a literal signed int value <value> to GPR <dst>
void LoadIntLiteral(Register dst, int value);
// load an SMI value <value> to GPR <dst>
void LoadSmiLiteral(Register dst, Smi* smi);
// load a literal double value <value> to FPR <result>
void LoadDoubleLiteral(DoubleRegister result, double value, Register scratch);
void LoadWord(Register dst, const MemOperand& mem, Register scratch);
void LoadWordArith(Register dst, const MemOperand& mem,
Register scratch = no_reg);
void StoreWord(Register src, const MemOperand& mem, Register scratch);
void LoadHalfWord(Register dst, const MemOperand& mem, Register scratch);
void LoadHalfWordArith(Register dst, const MemOperand& mem,
Register scratch = no_reg);
void StoreHalfWord(Register src, const MemOperand& mem, Register scratch);
void LoadByte(Register dst, const MemOperand& mem, Register scratch);
void StoreByte(Register src, const MemOperand& mem, Register scratch);
void LoadRepresentation(Register dst, const MemOperand& mem, Representation r,
Register scratch = no_reg);
void StoreRepresentation(Register src, const MemOperand& mem,
Representation r, Register scratch = no_reg);
void LoadDouble(DoubleRegister dst, const MemOperand& mem, Register scratch);
void StoreDouble(DoubleRegister src, const MemOperand& mem, Register scratch);
// Move values between integer and floating point registers.
void MovIntToDouble(DoubleRegister dst, Register src, Register scratch);
void MovUnsignedIntToDouble(DoubleRegister dst, Register src,
Register scratch);
void MovInt64ToDouble(DoubleRegister dst,
#if !V8_TARGET_ARCH_PPC64
Register src_hi,
#endif
Register src);
#if V8_TARGET_ARCH_PPC64
void MovInt64ComponentsToDouble(DoubleRegister dst, Register src_hi,
Register src_lo, Register scratch);
#endif
void InsertDoubleLow(DoubleRegister dst, Register src, Register scratch);
void InsertDoubleHigh(DoubleRegister dst, Register src, Register scratch);
void MovDoubleLowToInt(Register dst, DoubleRegister src);
void MovDoubleHighToInt(Register dst, DoubleRegister src);
void MovDoubleToInt64(
#if !V8_TARGET_ARCH_PPC64
Register dst_hi,
#endif
Register dst, DoubleRegister src);
void MovIntToFloat(DoubleRegister dst, Register src);
void MovFloatToInt(Register dst, DoubleRegister src);
void Add(Register dst, Register src, intptr_t value, Register scratch);
void Cmpi(Register src1, const Operand& src2, Register scratch,
CRegister cr = cr7);
void Cmpli(Register src1, const Operand& src2, Register scratch,
CRegister cr = cr7);
void Cmpwi(Register src1, const Operand& src2, Register scratch,
CRegister cr = cr7);
void Cmplwi(Register src1, const Operand& src2, Register scratch,
CRegister cr = cr7);
void And(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC);
void Or(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC);
void Xor(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC);
void AddSmiLiteral(Register dst, Register src, Smi* smi, Register scratch);
void SubSmiLiteral(Register dst, Register src, Smi* smi, Register scratch);
void CmpSmiLiteral(Register src1, Smi* smi, Register scratch,
CRegister cr = cr7);
void CmplSmiLiteral(Register src1, Smi* smi, Register scratch,
CRegister cr = cr7);
void AndSmiLiteral(Register dst, Register src, Smi* smi, Register scratch,
RCBit rc = LeaveRC);
// Set new rounding mode RN to FPSCR
void SetRoundingMode(FPRoundingMode RN);
// reset rounding mode to default (kRoundToNearest)
void ResetRoundingMode();
// These exist to provide portability between 32 and 64bit
void LoadP(Register dst, const MemOperand& mem, Register scratch = no_reg);
void StoreP(Register src, const MemOperand& mem, Register scratch = no_reg);
// ---------------------------------------------------------------------------
// JavaScript invokes
// Invoke the JavaScript function code by either calling or jumping.
void InvokeFunctionCode(Register function, Register new_target,
const ParameterCount& expected,
const ParameterCount& actual, InvokeFlag flag,
const CallWrapper& call_wrapper);
void FloodFunctionIfStepping(Register fun, Register new_target,
const ParameterCount& expected,
const ParameterCount& actual);
// Invoke the JavaScript function in the given register. Changes the
// current context to the context in the function before invoking.
void InvokeFunction(Register function, Register new_target,
const ParameterCount& actual, InvokeFlag flag,
const CallWrapper& call_wrapper);
void InvokeFunction(Register function, const ParameterCount& expected,
const ParameterCount& actual, InvokeFlag flag,
const CallWrapper& call_wrapper);
void InvokeFunction(Handle<JSFunction> function,
const ParameterCount& expected,
const ParameterCount& actual, InvokeFlag flag,
const CallWrapper& call_wrapper);
void IsObjectJSStringType(Register object, Register scratch, Label* fail);
void IsObjectNameType(Register object, Register scratch, Label* fail);
// ---------------------------------------------------------------------------
// Debugger Support
void DebugBreak();
// ---------------------------------------------------------------------------
// Exception handling
// Push a new stack handler and link into stack handler chain.
void PushStackHandler();
// Unlink the stack handler on top of the stack from the stack handler chain.
// Must preserve the result register.
void PopStackHandler();
// ---------------------------------------------------------------------------
// Inline caching support
// Generate code for checking access rights - used for security checks
// on access to global objects across environments. The holder register
// is left untouched, whereas both scratch registers are clobbered.
void CheckAccessGlobalProxy(Register holder_reg, Register scratch,
Label* miss);
void GetNumberHash(Register t0, Register scratch);
void LoadFromNumberDictionary(Label* miss, Register elements, Register key,
Register result, Register t0, Register t1,
Register t2);
inline void MarkCode(NopMarkerTypes type) { nop(type); }
// Check if the given instruction is a 'type' marker.
// i.e. check if is is a mov r<type>, r<type> (referenced as nop(type))
// These instructions are generated to mark special location in the code,
// like some special IC code.
static inline bool IsMarkedCode(Instr instr, int type) {
DCHECK((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER));
return IsNop(instr, type);
}
static inline int GetCodeMarker(Instr instr) {
int dst_reg_offset = 12;
int dst_mask = 0xf << dst_reg_offset;
int src_mask = 0xf;
int dst_reg = (instr & dst_mask) >> dst_reg_offset;
int src_reg = instr & src_mask;
uint32_t non_register_mask = ~(dst_mask | src_mask);
uint32_t mov_mask = al | 13 << 21;
// Return <n> if we have a mov rn rn, else return -1.
int type = ((instr & non_register_mask) == mov_mask) &&
(dst_reg == src_reg) && (FIRST_IC_MARKER <= dst_reg) &&
(dst_reg < LAST_CODE_MARKER)
? src_reg
: -1;
DCHECK((type == -1) ||
((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER)));
return type;
}
// ---------------------------------------------------------------------------
// Allocation support
// Allocate an object in new space or old space. The object_size is
// specified either in bytes or in words if the allocation flag SIZE_IN_WORDS
// is passed. If the space is exhausted control continues at the gc_required
// label. The allocated object is returned in result. If the flag
// tag_allocated_object is true the result is tagged as as a heap object.
// All registers are clobbered also when control continues at the gc_required
// label.
void Allocate(int object_size, Register result, Register scratch1,
Register scratch2, Label* gc_required, AllocationFlags flags);
void Allocate(Register object_size, Register result, Register result_end,
Register scratch, Label* gc_required, AllocationFlags flags);
void AllocateTwoByteString(Register result, Register length,
Register scratch1, Register scratch2,
Register scratch3, Label* gc_required);
void AllocateOneByteString(Register result, Register length,
Register scratch1, Register scratch2,
Register scratch3, Label* gc_required);
void AllocateTwoByteConsString(Register result, Register length,
Register scratch1, Register scratch2,
Label* gc_required);
void AllocateOneByteConsString(Register result, Register length,
Register scratch1, Register scratch2,
Label* gc_required);
void AllocateTwoByteSlicedString(Register result, Register length,
Register scratch1, Register scratch2,
Label* gc_required);
void AllocateOneByteSlicedString(Register result, Register length,
Register scratch1, Register scratch2,
Label* gc_required);
// Allocates a heap number or jumps to the gc_required label if the young
// space is full and a scavenge is needed. All registers are clobbered also
// when control continues at the gc_required label.
void AllocateHeapNumber(Register result, Register scratch1, Register scratch2,
Register heap_number_map, Label* gc_required,
TaggingMode tagging_mode = TAG_RESULT,
MutableMode mode = IMMUTABLE);
void AllocateHeapNumberWithValue(Register result, DoubleRegister value,
Register scratch1, Register scratch2,
Register heap_number_map,
Label* gc_required);
// Allocate and initialize a JSValue wrapper with the specified {constructor}
// and {value}.
void AllocateJSValue(Register result, Register constructor, Register value,
Register scratch1, Register scratch2,
Label* gc_required);
// Copies a number of bytes from src to dst. All registers are clobbered. On
// exit src and dst will point to the place just after where the last byte was
// read or written and length will be zero.
void CopyBytes(Register src, Register dst, Register length, Register scratch);
// Initialize fields with filler values. |count| fields starting at
// |current_address| are overwritten with the value in |filler|. At the end
// the loop, |current_address| points at the next uninitialized field.
// |count| is assumed to be non-zero.
void InitializeNFieldsWithFiller(Register current_address, Register count,
Register filler);
// Initialize fields with filler values. Fields starting at |current_address|
// not including |end_address| are overwritten with the value in |filler|. At
// the end the loop, |current_address| takes the value of |end_address|.
void InitializeFieldsWithFiller(Register current_address,
Register end_address, Register filler);
// ---------------------------------------------------------------------------
// Support functions.
// Machine code version of Map::GetConstructor().
// |temp| holds |result|'s map when done, and |temp2| its instance type.
void GetMapConstructor(Register result, Register map, Register temp,
Register temp2);
// Try to get function prototype of a function and puts the value in
// the result register. Checks that the function really is a
// function and jumps to the miss label if the fast checks fail. The
// function register will be untouched; the other registers may be
// clobbered.
void TryGetFunctionPrototype(Register function, Register result,
Register scratch, Label* miss);
// Compare object type for heap object. heap_object contains a non-Smi
// whose object type should be compared with the given type. This both
// sets the flags and leaves the object type in the type_reg register.
// It leaves the map in the map register (unless the type_reg and map register
// are the same register). It leaves the heap object in the heap_object
// register unless the heap_object register is the same register as one of the
// other registers.
// Type_reg can be no_reg. In that case ip is used.
void CompareObjectType(Register heap_object, Register map, Register type_reg,
InstanceType type);
// Compare instance type in a map. map contains a valid map object whose
// object type should be compared with the given type. This both
// sets the flags and leaves the object type in the type_reg register.
void CompareInstanceType(Register map, Register type_reg, InstanceType type);
// Check if a map for a JSObject indicates that the object has fast elements.
// Jump to the specified label if it does not.
void CheckFastElements(Register map, Register scratch, Label* fail);
// Check if a map for a JSObject indicates that the object can have both smi
// and HeapObject elements. Jump to the specified label if it does not.
void CheckFastObjectElements(Register map, Register scratch, Label* fail);
// Check if a map for a JSObject indicates that the object has fast smi only
// elements. Jump to the specified label if it does not.
void CheckFastSmiElements(Register map, Register scratch, Label* fail);
// Check to see if maybe_number can be stored as a double in
// FastDoubleElements. If it can, store it at the index specified by key in
// the FastDoubleElements array elements. Otherwise jump to fail.
void StoreNumberToDoubleElements(Register value_reg, Register key_reg,
Register elements_reg, Register scratch1,
DoubleRegister double_scratch, Label* fail,
int elements_offset = 0);
// Compare an object's map with the specified map and its transitioned
// elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. Condition flags are
// set with result of map compare. If multiple map compares are required, the
// compare sequences branches to early_success.
void CompareMap(Register obj, Register scratch, Handle<Map> map,
Label* early_success);
// As above, but the map of the object is already loaded into the register
// which is preserved by the code generated.
void CompareMap(Register obj_map, Handle<Map> map, Label* early_success);
// Check if the map of an object is equal to a specified map and branch to
// label if not. Skip the smi check if not required (object is known to be a
// heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
// against maps that are ElementsKind transition maps of the specified map.
void CheckMap(Register obj, Register scratch, Handle<Map> map, Label* fail,
SmiCheckType smi_check_type);
void CheckMap(Register obj, Register scratch, Heap::RootListIndex index,
Label* fail, SmiCheckType smi_check_type);
// Check if the map of an object is equal to a specified weak map and branch
// to a specified target if equal. Skip the smi check if not required
// (object is known to be a heap object)
void DispatchWeakMap(Register obj, Register scratch1, Register scratch2,
Handle<WeakCell> cell, Handle<Code> success,
SmiCheckType smi_check_type);
// Compare the given value and the value of weak cell.
void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch,
CRegister cr = cr7);
void GetWeakValue(Register value, Handle<WeakCell> cell);
// Load the value of the weak cell in the value register. Branch to the given
// miss label if the weak cell was cleared.
void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);
// Compare the object in a register to a value from the root list.
// Uses the ip register as scratch.
void CompareRoot(Register obj, Heap::RootListIndex index);
void PushRoot(Heap::RootListIndex index) {
LoadRoot(r0, index);
Push(r0);
}
// Compare the object in a register to a value and jump if they are equal.
void JumpIfRoot(Register with, Heap::RootListIndex index, Label* if_equal) {
CompareRoot(with, index);
beq(if_equal);
}
// Compare the object in a register to a value and jump if they are not equal.
void JumpIfNotRoot(Register with, Heap::RootListIndex index,
Label* if_not_equal) {
CompareRoot(with, index);
bne(if_not_equal);
}
// Load and check the instance type of an object for being a string.
// Loads the type into the second argument register.
// Returns a condition that will be enabled if the object was a string.
Condition IsObjectStringType(Register obj, Register type) {
LoadP(type, FieldMemOperand(obj, HeapObject::kMapOffset));
lbz(type, FieldMemOperand(type, Map::kInstanceTypeOffset));
andi(r0, type, Operand(kIsNotStringMask));
DCHECK_EQ(0u, kStringTag);
return eq;
}
// Picks out an array index from the hash field.
// Register use:
// hash - holds the index's hash. Clobbered.
// index - holds the overwritten index on exit.
void IndexFromHash(Register hash, Register index);
// Get the number of least significant bits from a register
void GetLeastBitsFromSmi(Register dst, Register src, int num_least_bits);
void GetLeastBitsFromInt32(Register dst, Register src, int mun_least_bits);
// Load the value of a smi object into a double register.
void SmiToDouble(DoubleRegister value, Register smi);
// Check if a double can be exactly represented as a signed 32-bit integer.
// CR_EQ in cr7 is set if true.
void TestDoubleIsInt32(DoubleRegister double_input, Register scratch1,
Register scratch2, DoubleRegister double_scratch);
// Try to convert a double to a signed 32-bit integer.
// CR_EQ in cr7 is set and result assigned if the conversion is exact.
void TryDoubleToInt32Exact(Register result, DoubleRegister double_input,
Register scratch, DoubleRegister double_scratch);
// Floor a double and writes the value to the result register.
// Go to exact if the conversion is exact (to be able to test -0),
// fall through calling code if an overflow occurred, else go to done.
// In return, input_high is loaded with high bits of input.
void TryInt32Floor(Register result, DoubleRegister double_input,
Register input_high, Register scratch,
DoubleRegister double_scratch, Label* done, Label* exact);
// Performs a truncating conversion of a floating point number as used by
// the JS bitwise operations. See ECMA-262 9.5: ToInt32. Goes to 'done' if it
// succeeds, otherwise falls through if result is saturated. On return
// 'result' either holds answer, or is clobbered on fall through.
//
// Only public for the test code in test-code-stubs-arm.cc.
void TryInlineTruncateDoubleToI(Register result, DoubleRegister input,
Label* done);
// Performs a truncating conversion of a floating point number as used by
// the JS bitwise operations. See ECMA-262 9.5: ToInt32.
// Exits with 'result' holding the answer.
void TruncateDoubleToI(Register result, DoubleRegister double_input);
// Performs a truncating conversion of a heap number as used by
// the JS bitwise operations. See ECMA-262 9.5: ToInt32. 'result' and 'input'
// must be different registers. Exits with 'result' holding the answer.
void TruncateHeapNumberToI(Register result, Register object);
// Converts the smi or heap number in object to an int32 using the rules
// for ToInt32 as described in ECMAScript 9.5.: the value is truncated
// and brought into the range -2^31 .. +2^31 - 1. 'result' and 'input' must be
// different registers.
void TruncateNumberToI(Register object, Register result,
Register heap_number_map, Register scratch1,
Label* not_int32);
// Overflow handling functions.
// Usage: call the appropriate arithmetic function and then call one of the
// flow control functions with the corresponding label.
// Compute dst = left + right, setting condition codes. dst may be same as
// either left or right (or a unique register). left and right must not be
// the same register.
void AddAndCheckForOverflow(Register dst, Register left, Register right,
Register overflow_dst, Register scratch = r0);
void AddAndCheckForOverflow(Register dst, Register left, intptr_t right,
Register overflow_dst, Register scratch = r0);
// Compute dst = left - right, setting condition codes. dst may be same as
// either left or right (or a unique register). left and right must not be
// the same register.
void SubAndCheckForOverflow(Register dst, Register left, Register right,
Register overflow_dst, Register scratch = r0);
void BranchOnOverflow(Label* label) { blt(label, cr0); }
void BranchOnNoOverflow(Label* label) { bge(label, cr0); }
void RetOnOverflow(void) { Ret(lt, cr0); }
void RetOnNoOverflow(void) { Ret(ge, cr0); }
// ---------------------------------------------------------------------------
// Runtime calls
// Call a code stub.
void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None(),
Condition cond = al);
// Call a code stub.
void TailCallStub(CodeStub* stub, Condition cond = al);
// Call a runtime routine.
void CallRuntime(const Runtime::Function* f, int num_arguments,
SaveFPRegsMode save_doubles = kDontSaveFPRegs);
void CallRuntimeSaveDoubles(Runtime::FunctionId fid) {
const Runtime::Function* function = Runtime::FunctionForId(fid);
CallRuntime(function, function->nargs, kSaveFPRegs);
}
// Convenience function: Same as above, but takes the fid instead.
void CallRuntime(Runtime::FunctionId fid,
SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
const Runtime::Function* function = Runtime::FunctionForId(fid);
CallRuntime(function, function->nargs, save_doubles);
}
// Convenience function: Same as above, but takes the fid instead.
void CallRuntime(Runtime::FunctionId fid, int num_arguments,
SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
CallRuntime(Runtime::FunctionForId(fid), num_arguments, save_doubles);
}
// Convenience function: call an external reference.
void CallExternalReference(const ExternalReference& ext, int num_arguments);
// Convenience function: tail call a runtime routine (jump).
void TailCallRuntime(Runtime::FunctionId fid);
int CalculateStackPassedWords(int num_reg_arguments,
int num_double_arguments);
// Before calling a C-function from generated code, align arguments on stack.
// After aligning the frame, non-register arguments must be stored in
// sp[0], sp[4], etc., not pushed. The argument count assumes all arguments
// are word sized. If double arguments are used, this function assumes that
// all double arguments are stored before core registers; otherwise the
// correct alignment of the double values is not guaranteed.
// Some compilers/platforms require the stack to be aligned when calling
// C++ code.
// Needs a scratch register to do some arithmetic. This register will be
// trashed.
void PrepareCallCFunction(int num_reg_arguments, int num_double_registers,
Register scratch);
void PrepareCallCFunction(int num_reg_arguments, Register scratch);
// There are two ways of passing double arguments on ARM, depending on
// whether soft or hard floating point ABI is used. These functions
// abstract parameter passing for the three different ways we call
// C functions from generated code.
void MovToFloatParameter(DoubleRegister src);
void MovToFloatParameters(DoubleRegister src1, DoubleRegister src2);
void MovToFloatResult(DoubleRegister src);
// Calls a C function and cleans up the space for arguments allocated
// by PrepareCallCFunction. The called function is not allowed to trigger a
// garbage collection, since that might move the code and invalidate the
// return address (unless this is somehow accounted for by the called
// function).
void CallCFunction(ExternalReference function, int num_arguments);
void CallCFunction(Register function, int num_arguments);
void CallCFunction(ExternalReference function, int num_reg_arguments,
int num_double_arguments);
void CallCFunction(Register function, int num_reg_arguments,
int num_double_arguments);
void MovFromFloatParameter(DoubleRegister dst);
void MovFromFloatResult(DoubleRegister dst);
// Jump to a runtime routine.
void JumpToExternalReference(const ExternalReference& builtin);
// Invoke specified builtin JavaScript function.
void InvokeBuiltin(int native_context_index, InvokeFlag flag,
const CallWrapper& call_wrapper = NullCallWrapper());
Handle<Object> CodeObject() {
DCHECK(!code_object_.is_null());
return code_object_;
}
// Emit code for a truncating division by a constant. The dividend register is
// unchanged and ip gets clobbered. Dividend and result must be different.
void TruncatingDiv(Register result, Register dividend, int32_t divisor);
// ---------------------------------------------------------------------------
// StatsCounter support
void SetCounter(StatsCounter* counter, int value, Register scratch1,
Register scratch2);
void IncrementCounter(StatsCounter* counter, int value, Register scratch1,
Register scratch2);
void DecrementCounter(StatsCounter* counter, int value, Register scratch1,
Register scratch2);
// ---------------------------------------------------------------------------
// Debugging
// Calls Abort(msg) if the condition cond is not satisfied.
// Use --debug_code to enable.
void Assert(Condition cond, BailoutReason reason, CRegister cr = cr7);
void AssertFastElements(Register elements);
// Like Assert(), but always enabled.
void Check(Condition cond, BailoutReason reason, CRegister cr = cr7);
// Print a message to stdout and abort execution.
void Abort(BailoutReason reason);
// Verify restrictions about code generated in stubs.
void set_generating_stub(bool value) { generating_stub_ = value; }
bool generating_stub() { return generating_stub_; }
void set_has_frame(bool value) { has_frame_ = value; }
bool has_frame() { return has_frame_; }
inline bool AllowThisStubCall(CodeStub* stub);
// ---------------------------------------------------------------------------
// Number utilities
// Check whether the value of reg is a power of two and not zero. If not
// control continues at the label not_power_of_two. If reg is a power of two
// the register scratch contains the value of (reg - 1) when control falls
// through.
void JumpIfNotPowerOfTwoOrZero(Register reg, Register scratch,
Label* not_power_of_two_or_zero);
// Check whether the value of reg is a power of two and not zero.
// Control falls through if it is, with scratch containing the mask
// value (reg - 1).
// Otherwise control jumps to the 'zero_and_neg' label if the value of reg is
// zero or negative, or jumps to the 'not_power_of_two' label if the value is
// strictly positive but not a power of two.
void JumpIfNotPowerOfTwoOrZeroAndNeg(Register reg, Register scratch,
Label* zero_and_neg,
Label* not_power_of_two);
// ---------------------------------------------------------------------------
// Bit testing/extraction
//
// Bit numbering is such that the least significant bit is bit 0
// (for consistency between 32/64-bit).
// Extract consecutive bits (defined by rangeStart - rangeEnd) from src
// and place them into the least significant bits of dst.
inline void ExtractBitRange(Register dst, Register src, int rangeStart,
int rangeEnd, RCBit rc = LeaveRC) {
DCHECK(rangeStart >= rangeEnd && rangeStart < kBitsPerPointer);
int rotate = (rangeEnd == 0) ? 0 : kBitsPerPointer - rangeEnd;
int width = rangeStart - rangeEnd + 1;
if (rc == SetRC && rangeEnd == 0 && width <= 16) {
andi(dst, src, Operand((1 << width) - 1));
} else {
#if V8_TARGET_ARCH_PPC64
rldicl(dst, src, rotate, kBitsPerPointer - width, rc);
#else
rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer - 1,
rc);
#endif
}
}
inline void ExtractBit(Register dst, Register src, uint32_t bitNumber,
RCBit rc = LeaveRC) {
ExtractBitRange(dst, src, bitNumber, bitNumber, rc);
}
// Extract consecutive bits (defined by mask) from src and place them
// into the least significant bits of dst.
inline void ExtractBitMask(Register dst, Register src, uintptr_t mask,
RCBit rc = LeaveRC) {
int start = kBitsPerPointer - 1;
int end;
uintptr_t bit = (1L << start);
while (bit && (mask & bit) == 0) {
start--;
bit >>= 1;
}
end = start;
bit >>= 1;
while (bit && (mask & bit)) {
end--;
bit >>= 1;
}
// 1-bits in mask must be contiguous
DCHECK(bit == 0 || (mask & ((bit << 1) - 1)) == 0);
ExtractBitRange(dst, src, start, end, rc);
}
// Test single bit in value.
inline void TestBit(Register value, int bitNumber, Register scratch = r0) {
ExtractBitRange(scratch, value, bitNumber, bitNumber, SetRC);
}
// Test consecutive bit range in value. Range is defined by
// rangeStart - rangeEnd.
inline void TestBitRange(Register value, int rangeStart, int rangeEnd,
Register scratch = r0) {
ExtractBitRange(scratch, value, rangeStart, rangeEnd, SetRC);
}
// Test consecutive bit range in value. Range is defined by mask.
inline void TestBitMask(Register value, uintptr_t mask,
Register scratch = r0) {
ExtractBitMask(scratch, value, mask, SetRC);
}
// ---------------------------------------------------------------------------
// Smi utilities
// Shift left by kSmiShift
void SmiTag(Register reg, RCBit rc = LeaveRC) { SmiTag(reg, reg, rc); }
void SmiTag(Register dst, Register src, RCBit rc = LeaveRC) {
ShiftLeftImm(dst, src, Operand(kSmiShift), rc);
}
#if !V8_TARGET_ARCH_PPC64
// Test for overflow < 0: use BranchOnOverflow() or BranchOnNoOverflow().
void SmiTagCheckOverflow(Register reg, Register overflow);
void SmiTagCheckOverflow(Register dst, Register src, Register overflow);
inline void JumpIfNotSmiCandidate(Register value, Register scratch,
Label* not_smi_label) {
// High bits must be identical to fit into an Smi
STATIC_ASSERT(kSmiShift == 1);
addis(scratch, value, Operand(0x40000000u >> 16));
cmpi(scratch, Operand::Zero());
blt(not_smi_label);
}
#endif
inline void TestUnsignedSmiCandidate(Register value, Register scratch) {
// The test is different for unsigned int values. Since we need
// the value to be in the range of a positive smi, we can't
// handle any of the high bits being set in the value.
TestBitRange(value, kBitsPerPointer - 1, kBitsPerPointer - 1 - kSmiShift,
scratch);
}
inline void JumpIfNotUnsignedSmiCandidate(Register value, Register scratch,
Label* not_smi_label) {
TestUnsignedSmiCandidate(value, scratch);
bne(not_smi_label, cr0);
}
void SmiUntag(Register reg, RCBit rc = LeaveRC) { SmiUntag(reg, reg, rc); }
void SmiUntag(Register dst, Register src, RCBit rc = LeaveRC) {
ShiftRightArithImm(dst, src, kSmiShift, rc);
}
void SmiToPtrArrayOffset(Register dst, Register src) {
#if V8_TARGET_ARCH_PPC64
STATIC_ASSERT(kSmiTag == 0 && kSmiShift > kPointerSizeLog2);
ShiftRightArithImm(dst, src, kSmiShift - kPointerSizeLog2);
#else
STATIC_ASSERT(kSmiTag == 0 && kSmiShift < kPointerSizeLog2);
ShiftLeftImm(dst, src, Operand(kPointerSizeLog2 - kSmiShift));
#endif
}
void SmiToByteArrayOffset(Register dst, Register src) { SmiUntag(dst, src); }
void SmiToShortArrayOffset(Register dst, Register src) {
#if V8_TARGET_ARCH_PPC64
STATIC_ASSERT(kSmiTag == 0 && kSmiShift > 1);
ShiftRightArithImm(dst, src, kSmiShift - 1);
#else
STATIC_ASSERT(kSmiTag == 0 && kSmiShift == 1);
if (!dst.is(src)) {
mr(dst, src);
}
#endif
}
void SmiToIntArrayOffset(Register dst, Register src) {
#if V8_TARGET_ARCH_PPC64
STATIC_ASSERT(kSmiTag == 0 && kSmiShift > 2);
ShiftRightArithImm(dst, src, kSmiShift - 2);
#else
STATIC_ASSERT(kSmiTag == 0 && kSmiShift < 2);
ShiftLeftImm(dst, src, Operand(2 - kSmiShift));
#endif
}
#define SmiToFloatArrayOffset SmiToIntArrayOffset
void SmiToDoubleArrayOffset(Register dst, Register src) {
#if V8_TARGET_ARCH_PPC64
STATIC_ASSERT(kSmiTag == 0 && kSmiShift > kDoubleSizeLog2);
ShiftRightArithImm(dst, src, kSmiShift - kDoubleSizeLog2);
#else
STATIC_ASSERT(kSmiTag == 0 && kSmiShift < kDoubleSizeLog2);
ShiftLeftImm(dst, src, Operand(kDoubleSizeLog2 - kSmiShift));
#endif
}
void SmiToArrayOffset(Register dst, Register src, int elementSizeLog2) {
if (kSmiShift < elementSizeLog2) {
ShiftLeftImm(dst, src, Operand(elementSizeLog2 - kSmiShift));
} else if (kSmiShift > elementSizeLog2) {
ShiftRightArithImm(dst, src, kSmiShift - elementSizeLog2);
} else if (!dst.is(src)) {
mr(dst, src);
}
}
void IndexToArrayOffset(Register dst, Register src, int elementSizeLog2,
bool isSmi) {
if (isSmi) {
SmiToArrayOffset(dst, src, elementSizeLog2);
} else {
ShiftLeftImm(dst, src, Operand(elementSizeLog2));
}
}
// Untag the source value into destination and jump if source is a smi.
// Souce and destination can be the same register.
void UntagAndJumpIfSmi(Register dst, Register src, Label* smi_case);
// Untag the source value into destination and jump if source is not a smi.
// Souce and destination can be the same register.
void UntagAndJumpIfNotSmi(Register dst, Register src, Label* non_smi_case);
inline void TestIfSmi(Register value, Register scratch) {
TestBitRange(value, kSmiTagSize - 1, 0, scratch);
}
inline void TestIfPositiveSmi(Register value, Register scratch) {
#if V8_TARGET_ARCH_PPC64
rldicl(scratch, value, 1, kBitsPerPointer - (1 + kSmiTagSize), SetRC);
#else
rlwinm(scratch, value, 1, kBitsPerPointer - (1 + kSmiTagSize),
kBitsPerPointer - 1, SetRC);
#endif
}
// Jump the register contains a smi.
inline void JumpIfSmi(Register value, Label* smi_label) {
TestIfSmi(value, r0);
beq(smi_label, cr0); // branch if SMI
}
// Jump if either of the registers contain a non-smi.
inline void JumpIfNotSmi(Register value, Label* not_smi_label) {
TestIfSmi(value, r0);
bne(not_smi_label, cr0);
}
// Jump if either of the registers contain a non-smi.
void JumpIfNotBothSmi(Register reg1, Register reg2, Label* on_not_both_smi);
// Jump if either of the registers contain a smi.
void JumpIfEitherSmi(Register reg1, Register reg2, Label* on_either_smi);
// Abort execution if argument is a smi, enabled via --debug-code.
void AssertNotSmi(Register object);
void AssertSmi(Register object);
#if V8_TARGET_ARCH_PPC64
inline void TestIfInt32(Register value, Register scratch,
CRegister cr = cr7) {
// High bits must be identical to fit into an 32-bit integer
extsw(scratch, value);
cmp(scratch, value, cr);
}
#else
inline void TestIfInt32(Register hi_word, Register lo_word, Register scratch,
CRegister cr = cr7) {
// High bits must be identical to fit into an 32-bit integer
srawi(scratch, lo_word, 31);
cmp(scratch, hi_word, cr);
}
#endif
#if V8_TARGET_ARCH_PPC64
// Ensure it is permissable to read/write int value directly from
// upper half of the smi.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
#endif
#if V8_TARGET_ARCH_PPC64 && V8_TARGET_LITTLE_ENDIAN
#define SmiWordOffset(offset) (offset + kPointerSize / 2)
#else
#define SmiWordOffset(offset) offset
#endif
// Abort execution if argument is not a string, enabled via --debug-code.
void AssertString(Register object);
// Abort execution if argument is not a name, enabled via --debug-code.
void AssertName(Register object);
void AssertFunction(Register object);
// Abort execution if argument is not a JSBoundFunction,
// enabled via --debug-code.
void AssertBoundFunction(Register object);
// Abort execution if argument is not undefined or an AllocationSite, enabled
// via --debug-code.
void AssertUndefinedOrAllocationSite(Register object, Register scratch);
// Abort execution if reg is not the root value with the given index,
// enabled via --debug-code.
void AssertIsRoot(Register reg, Heap::RootListIndex index);
// ---------------------------------------------------------------------------
// HeapNumber utilities
void JumpIfNotHeapNumber(Register object, Register heap_number_map,
Register scratch, Label* on_not_heap_number);
// ---------------------------------------------------------------------------
// String utilities
// Checks if both objects are sequential one-byte strings and jumps to label
// if either is not. Assumes that neither object is a smi.
void JumpIfNonSmisNotBothSequentialOneByteStrings(Register object1,
Register object2,
Register scratch1,
Register scratch2,
Label* failure);
// Checks if both objects are sequential one-byte strings and jumps to label
// if either is not.
void JumpIfNotBothSequentialOneByteStrings(Register first, Register second,
Register scratch1,
Register scratch2,
Label* not_flat_one_byte_strings);
// Checks if both instance types are sequential one-byte strings and jumps to
// label if either is not.
void JumpIfBothInstanceTypesAreNotSequentialOneByte(
Register first_object_instance_type, Register second_object_instance_type,
Register scratch1, Register scratch2, Label* failure);
// Check if instance type is sequential one-byte string and jump to label if
// it is not.
void JumpIfInstanceTypeIsNotSequentialOneByte(Register type, Register scratch,
Label* failure);
void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name);
void EmitSeqStringSetCharCheck(Register string, Register index,
Register value, uint32_t encoding_mask);
// ---------------------------------------------------------------------------
// Patching helpers.
// Decode offset from constant pool load instruction(s).
// Caller must place the instruction word at <location> in <result>.
void DecodeConstantPoolOffset(Register result, Register location);
void ClampUint8(Register output_reg, Register input_reg);
// Saturate a value into 8-bit unsigned integer
// if input_value < 0, output_value is 0
// if input_value > 255, output_value is 255
// otherwise output_value is the (int)input_value (round to nearest)
void ClampDoubleToUint8(Register result_reg, DoubleRegister input_reg,
DoubleRegister temp_double_reg);
void LoadInstanceDescriptors(Register map, Register descriptors);
void EnumLength(Register dst, Register map);
void NumberOfOwnDescriptors(Register dst, Register map);
void LoadAccessor(Register dst, Register holder, int accessor_index,
AccessorComponent accessor);
template <typename Field>
void DecodeField(Register dst, Register src, RCBit rc = LeaveRC) {
ExtractBitRange(dst, src, Field::kShift + Field::kSize - 1, Field::kShift,
rc);
}
template <typename Field>
void DecodeField(Register reg, RCBit rc = LeaveRC) {
DecodeField<Field>(reg, reg, rc);
}
template <typename Field>
void DecodeFieldToSmi(Register dst, Register src) {
#if V8_TARGET_ARCH_PPC64
DecodeField<Field>(dst, src);
SmiTag(dst);
#else
// 32-bit can do this in one instruction:
int start = Field::kSize + kSmiShift - 1;
int end = kSmiShift;
int rotate = kSmiShift - Field::kShift;
if (rotate < 0) {
rotate += kBitsPerPointer;
}
rlwinm(dst, src, rotate, kBitsPerPointer - start - 1,
kBitsPerPointer - end - 1);
#endif
}
template <typename Field>
void DecodeFieldToSmi(Register reg) {
DecodeFieldToSmi<Field>(reg, reg);
}
// Load the type feedback vector from a JavaScript frame.
void EmitLoadTypeFeedbackVector(Register vector);
// Activation support.
void EnterFrame(StackFrame::Type type,
bool load_constant_pool_pointer_reg = false);
// Returns the pc offset at which the frame ends.
int LeaveFrame(StackFrame::Type type, int stack_adjustment = 0);
// Expects object in r0 and returns map with validated enum cache
// in r0. Assumes that any other register can be used as a scratch.
void CheckEnumCache(Register null_value, Label* call_runtime);
// AllocationMemento support. Arrays may have an associated
// AllocationMemento object that can be checked for in order to pretransition
// to another type.
// On entry, receiver_reg should point to the array object.
// scratch_reg gets clobbered.
// If allocation info is present, condition flags are set to eq.
void TestJSArrayForAllocationMemento(Register receiver_reg,
Register scratch_reg,
Label* no_memento_found);
void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
Register scratch_reg,
Label* memento_found) {
Label no_memento_found;
TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
&no_memento_found);
beq(memento_found);
bind(&no_memento_found);
}
// Jumps to found label if a prototype map has dictionary elements.
void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
Register scratch1, Label* found);
// Loads the constant pool pointer (kConstantPoolRegister).
void LoadConstantPoolPointerRegisterFromCodeTargetAddress(
Register code_target_address);
void LoadConstantPoolPointerRegister();
void LoadConstantPoolPointerRegister(Register base, int code_entry_delta = 0);
void AbortConstantPoolBuilding() {
#ifdef DEBUG
// Avoid DCHECK(!is_linked()) failure in ~Label()
bind(ConstantPoolPosition());
#endif
}
private:
static const int kSmiShift = kSmiTagSize + kSmiShiftSize;
void CallCFunctionHelper(Register function, int num_reg_arguments,
int num_double_arguments);
void Jump(intptr_t target, RelocInfo::Mode rmode, Condition cond = al,
CRegister cr = cr7);
// Helper functions for generating invokes.
void InvokePrologue(const ParameterCount& expected,
const ParameterCount& actual, Label* done,
bool* definitely_mismatches, InvokeFlag flag,
const CallWrapper& call_wrapper);
void InitializeNewString(Register string, Register length,
Heap::RootListIndex map_index, Register scratch1,
Register scratch2);
// Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
void InNewSpace(Register object, Register scratch,
Condition cond, // eq for new space, ne otherwise.
Label* branch);
// Helper for finding the mark bits for an address. Afterwards, the
// bitmap register points at the word with the mark bits and the mask
// the position of the first bit. Leaves addr_reg unchanged.
inline void GetMarkBits(Register addr_reg, Register bitmap_reg,
Register mask_reg);
static const RegList kSafepointSavedRegisters;
static const int kNumSafepointSavedRegisters;
// Compute memory operands for safepoint stack slots.
static int SafepointRegisterStackIndex(int reg_code);
MemOperand SafepointRegisterSlot(Register reg);
MemOperand SafepointRegistersAndDoublesSlot(Register reg);
bool generating_stub_;
bool has_frame_;
// This handle will be patched with the code object on installation.
Handle<Object> code_object_;
// Needs access to SafepointRegisterStackIndex for compiled frame
// traversal.
friend class StandardFrame;
};
// The code patcher is used to patch (typically) small parts of code e.g. for
// debugging and other types of instrumentation. When using the code patcher
// the exact number of bytes specified must be emitted. It is not legal to emit
// relocation information. If any of these constraints are violated it causes
// an assertion to fail.
class CodePatcher {
public:
enum FlushICache { FLUSH, DONT_FLUSH };
CodePatcher(Isolate* isolate, byte* address, int instructions,
FlushICache flush_cache = FLUSH);
~CodePatcher();
// Macro assembler to emit code.
MacroAssembler* masm() { return &masm_; }
// Emit an instruction directly.
void Emit(Instr instr);
// Emit the condition part of an instruction leaving the rest of the current
// instruction unchanged.
void EmitCondition(Condition cond);
private:
byte* address_; // The address of the code being patched.
int size_; // Number of bytes of the expected patch size.
MacroAssembler masm_; // Macro assembler used to generate the code.
FlushICache flush_cache_; // Whether to flush the I cache after patching.
};
// -----------------------------------------------------------------------------
// Static helper functions.
inline MemOperand ContextMemOperand(Register context, int index = 0) {
return MemOperand(context, Context::SlotOffset(index));
}
inline MemOperand NativeContextMemOperand() {
return ContextMemOperand(cp, Context::NATIVE_CONTEXT_INDEX);
}
#ifdef GENERATED_CODE_COVERAGE
#define CODE_COVERAGE_STRINGIFY(x) #x
#define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
#define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
#define ACCESS_MASM(masm) \
masm->stop(__FILE_LINE__); \
masm->
#else
#define ACCESS_MASM(masm) masm->
#endif
} // namespace internal
} // namespace v8
#endif // V8_PPC_MACRO_ASSEMBLER_PPC_H_