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dart / sdk / b3055a148252f1ef73a18e5a45bcf8eb1dd18652 / . / runtime / vm / compiler / assembler / assembler_ia32.h
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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_COMPILER_ASSEMBLER_ASSEMBLER_IA32_H_
#define RUNTIME_VM_COMPILER_ASSEMBLER_ASSEMBLER_IA32_H_
#ifndef RUNTIME_VM_COMPILER_ASSEMBLER_ASSEMBLER_H_
#error Do not include assembler_ia32.h directly; use assembler.h instead.
#endif
#include "platform/assert.h"
#include "platform/utils.h"
#include "vm/constants_ia32.h"
#include "vm/constants_x86.h"
namespace dart {
// Forward declarations.
class RuntimeEntry;
class StubEntry;
class Immediate : public ValueObject {
public:
explicit Immediate(int32_t value) : value_(value) {}
Immediate(const Immediate& other) : ValueObject(), value_(other.value_) {}
int32_t value() const { return value_; }
bool is_int8() const { return Utils::IsInt(8, value_); }
bool is_uint8() const { return Utils::IsUint(8, value_); }
bool is_uint16() const { return Utils::IsUint(16, value_); }
private:
const int32_t value_;
// TODO(5411081): Add DISALLOW_COPY_AND_ASSIGN(Immediate) once the mac
// build issue is resolved.
// And remove the unnecessary copy constructor.
};
class Operand : public ValueObject {
public:
uint8_t mod() const { return (encoding_at(0) >> 6) & 3; }
Register rm() const { return static_cast<Register>(encoding_at(0) & 7); }
ScaleFactor scale() const {
return static_cast<ScaleFactor>((encoding_at(1) >> 6) & 3);
}
Register index() const {
return static_cast<Register>((encoding_at(1) >> 3) & 7);
}
Register base() const { return static_cast<Register>(encoding_at(1) & 7); }
int8_t disp8() const {
ASSERT(length_ >= 2);
return static_cast<int8_t>(encoding_[length_ - 1]);
}
int32_t disp32() const {
ASSERT(length_ >= 5);
return bit_copy<int32_t>(encoding_[length_ - 4]);
}
Operand(const Operand& other) : ValueObject(), length_(other.length_) {
memmove(&encoding_[0], &other.encoding_[0], other.length_);
}
Operand& operator=(const Operand& other) {
length_ = other.length_;
memmove(&encoding_[0], &other.encoding_[0], other.length_);
return *this;
}
bool Equals(const Operand& other) const {
if (length_ != other.length_) return false;
for (uint8_t i = 0; i < length_; i++) {
if (encoding_[i] != other.encoding_[i]) return false;
}
return true;
}
protected:
Operand() : length_(0) {} // Needed by subclass Address.
void SetModRM(int mod, Register rm) {
ASSERT((mod & ~3) == 0);
encoding_[0] = (mod << 6) | rm;
length_ = 1;
}
void SetSIB(ScaleFactor scale, Register index, Register base) {
ASSERT(length_ == 1);
ASSERT((scale & ~3) == 0);
encoding_[1] = (scale << 6) | (index << 3) | base;
length_ = 2;
}
void SetDisp8(int8_t disp) {
ASSERT(length_ == 1 || length_ == 2);
encoding_[length_++] = static_cast<uint8_t>(disp);
}
void SetDisp32(int32_t disp) {
ASSERT(length_ == 1 || length_ == 2);
intptr_t disp_size = sizeof(disp);
memmove(&encoding_[length_], &disp, disp_size);
length_ += disp_size;
}
private:
uint8_t length_;
uint8_t encoding_[6];
uint8_t padding_;
explicit Operand(Register reg) { SetModRM(3, reg); }
// Get the operand encoding byte at the given index.
uint8_t encoding_at(intptr_t index) const {
ASSERT(index >= 0 && index < length_);
return encoding_[index];
}
// Returns whether or not this operand is really the given register in
// disguise. Used from the assembler to generate better encodings.
bool IsRegister(Register reg) const {
return ((encoding_[0] & 0xF8) == 0xC0) // Addressing mode is register only.
&& ((encoding_[0] & 0x07) == reg); // Register codes match.
}
friend class Assembler;
};
class Address : public Operand {
public:
Address(Register base, int32_t disp) {
if (disp == 0 && base != EBP) {
SetModRM(0, base);
if (base == ESP) SetSIB(TIMES_1, ESP, base);
} else if (Utils::IsInt(8, disp)) {
SetModRM(1, base);
if (base == ESP) SetSIB(TIMES_1, ESP, base);
SetDisp8(disp);
} else {
SetModRM(2, base);
if (base == ESP) SetSIB(TIMES_1, ESP, base);
SetDisp32(disp);
}
}
Address(Register index, ScaleFactor scale, int32_t disp) {
ASSERT(index != ESP); // Illegal addressing mode.
SetModRM(0, ESP);
SetSIB(scale, index, EBP);
SetDisp32(disp);
}
// This addressing mode does not exist.
Address(Register index, ScaleFactor scale, Register r);
Address(Register base, Register index, ScaleFactor scale, int32_t disp) {
ASSERT(index != ESP); // Illegal addressing mode.
if (disp == 0 && base != EBP) {
SetModRM(0, ESP);
SetSIB(scale, index, base);
} else if (Utils::IsInt(8, disp)) {
SetModRM(1, ESP);
SetSIB(scale, index, base);
SetDisp8(disp);
} else {
SetModRM(2, ESP);
SetSIB(scale, index, base);
SetDisp32(disp);
}
}
// This addressing mode does not exist.
Address(Register base, Register index, ScaleFactor scale, Register r);
Address(const Address& other) : Operand(other) {}
Address& operator=(const Address& other) {
Operand::operator=(other);
return *this;
}
static Address Absolute(const uword addr) {
Address result;
result.SetModRM(0, EBP);
result.SetDisp32(addr);
return result;
}
private:
Address() {} // Needed by Address::Absolute.
};
class FieldAddress : public Address {
public:
FieldAddress(Register base, int32_t disp)
: Address(base, disp - kHeapObjectTag) {}
// This addressing mode does not exist.
FieldAddress(Register base, Register r);
FieldAddress(Register base, Register index, ScaleFactor scale, int32_t disp)
: Address(base, index, scale, disp - kHeapObjectTag) {}
// This addressing mode does not exist.
FieldAddress(Register base, Register index, ScaleFactor scale, Register r);
FieldAddress(const FieldAddress& other) : Address(other) {}
FieldAddress& operator=(const FieldAddress& other) {
Address::operator=(other);
return *this;
}
};
class Assembler : public ValueObject {
public:
explicit Assembler(ObjectPoolWrapper* object_pool_wrapper,
bool use_far_branches = false)
: buffer_(),
prologue_offset_(-1),
jit_cookie_(0),
comments_(),
code_(Code::ZoneHandle()) {
// On ia32 we don't use object pools.
USE(object_pool_wrapper);
// This mode is only needed and implemented for ARM.
ASSERT(!use_far_branches);
}
~Assembler() {}
static const bool kNearJump = true;
static const bool kFarJump = false;
/*
* Emit Machine Instructions.
*/
void call(Register reg);
void call(const Address& address);
void call(Label* label);
void call(const ExternalLabel* label);
static const intptr_t kCallExternalLabelSize = 5;
void pushl(Register reg);
void pushl(const Address& address);
void pushl(const Immediate& imm);
void popl(Register reg);
void popl(const Address& address);
void pushal();
void popal();
void setcc(Condition condition, ByteRegister dst);
void movl(Register dst, const Immediate& src);
void movl(Register dst, Register src);
void movl(Register dst, const Address& src);
void movl(const Address& dst, Register src);
void movl(const Address& dst, const Immediate& imm);
void movzxb(Register dst, ByteRegister src);
void movzxb(Register dst, const Address& src);
void movsxb(Register dst, ByteRegister src);
void movsxb(Register dst, const Address& src);
void movb(Register dst, const Address& src);
void movb(const Address& dst, ByteRegister src);
void movb(const Address& dst, const Immediate& imm);
void movzxw(Register dst, Register src);
void movzxw(Register dst, const Address& src);
void movsxw(Register dst, Register src);
void movsxw(Register dst, const Address& src);
void movw(Register dst, const Address& src);
void movw(const Address& dst, Register src);
void movw(const Address& dst, const Immediate& imm);
void leal(Register dst, const Address& src);
void cmovno(Register dst, Register src);
void cmove(Register dst, Register src);
void cmovne(Register dst, Register src);
void cmovs(Register dst, Register src);
void cmovns(Register dst, Register src);
void cmovgel(Register dst, Register src);
void cmovlessl(Register dst, Register src);
void rep_movsb();
void movss(XmmRegister dst, const Address& src);
void movss(const Address& dst, XmmRegister src);
void movss(XmmRegister dst, XmmRegister src);
void movd(XmmRegister dst, Register src);
void movd(Register dst, XmmRegister src);
void movq(const Address& dst, XmmRegister src);
void movq(XmmRegister dst, const Address& src);
void addss(XmmRegister dst, XmmRegister src);
void addss(XmmRegister dst, const Address& src);
void subss(XmmRegister dst, XmmRegister src);
void subss(XmmRegister dst, const Address& src);
void mulss(XmmRegister dst, XmmRegister src);
void mulss(XmmRegister dst, const Address& src);
void divss(XmmRegister dst, XmmRegister src);
void divss(XmmRegister dst, const Address& src);
void movsd(XmmRegister dst, const Address& src);
void movsd(const Address& dst, XmmRegister src);
void movsd(XmmRegister dst, XmmRegister src);
void movaps(XmmRegister dst, XmmRegister src);
void movups(XmmRegister dst, const Address& src);
void movups(const Address& dst, XmmRegister src);
void addsd(XmmRegister dst, XmmRegister src);
void addsd(XmmRegister dst, const Address& src);
void subsd(XmmRegister dst, XmmRegister src);
void subsd(XmmRegister dst, const Address& src);
void mulsd(XmmRegister dst, XmmRegister src);
void mulsd(XmmRegister dst, const Address& src);
void divsd(XmmRegister dst, XmmRegister src);
void divsd(XmmRegister dst, const Address& src);
void addpl(XmmRegister dst, XmmRegister src);
void subpl(XmmRegister dst, XmmRegister src);
void addps(XmmRegister dst, XmmRegister src);
void subps(XmmRegister dst, XmmRegister src);
void divps(XmmRegister dst, XmmRegister src);
void mulps(XmmRegister dst, XmmRegister src);
void minps(XmmRegister dst, XmmRegister src);
void maxps(XmmRegister dst, XmmRegister src);
void andps(XmmRegister dst, XmmRegister src);
void andps(XmmRegister dst, const Address& src);
void orps(XmmRegister dst, XmmRegister src);
void notps(XmmRegister dst);
void negateps(XmmRegister dst);
void absps(XmmRegister dst);
void zerowps(XmmRegister dst);
void cmppseq(XmmRegister dst, XmmRegister src);
void cmppsneq(XmmRegister dst, XmmRegister src);
void cmppslt(XmmRegister dst, XmmRegister src);
void cmppsle(XmmRegister dst, XmmRegister src);
void cmppsnlt(XmmRegister dst, XmmRegister src);
void cmppsnle(XmmRegister dst, XmmRegister src);
void sqrtps(XmmRegister dst);
void rsqrtps(XmmRegister dst);
void reciprocalps(XmmRegister dst);
void movhlps(XmmRegister dst, XmmRegister src);
void movlhps(XmmRegister dst, XmmRegister src);
void unpcklps(XmmRegister dst, XmmRegister src);
void unpckhps(XmmRegister dst, XmmRegister src);
void unpcklpd(XmmRegister dst, XmmRegister src);
void unpckhpd(XmmRegister dst, XmmRegister src);
void set1ps(XmmRegister dst, Register tmp, const Immediate& imm);
void shufps(XmmRegister dst, XmmRegister src, const Immediate& mask);
void addpd(XmmRegister dst, XmmRegister src);
void negatepd(XmmRegister dst);
void subpd(XmmRegister dst, XmmRegister src);
void mulpd(XmmRegister dst, XmmRegister src);
void divpd(XmmRegister dst, XmmRegister src);
void abspd(XmmRegister dst);
void minpd(XmmRegister dst, XmmRegister src);
void maxpd(XmmRegister dst, XmmRegister src);
void sqrtpd(XmmRegister dst);
void cvtps2pd(XmmRegister dst, XmmRegister src);
void cvtpd2ps(XmmRegister dst, XmmRegister src);
void shufpd(XmmRegister dst, XmmRegister src, const Immediate& mask);
void cvtsi2ss(XmmRegister dst, Register src);
void cvtsi2sd(XmmRegister dst, Register src);
void cvtss2si(Register dst, XmmRegister src);
void cvtss2sd(XmmRegister dst, XmmRegister src);
void cvtsd2si(Register dst, XmmRegister src);
void cvtsd2ss(XmmRegister dst, XmmRegister src);
void cvttss2si(Register dst, XmmRegister src);
void cvttsd2si(Register dst, XmmRegister src);
void cvtdq2pd(XmmRegister dst, XmmRegister src);
void comiss(XmmRegister a, XmmRegister b);
void comisd(XmmRegister a, XmmRegister b);
void movmskpd(Register dst, XmmRegister src);
void movmskps(Register dst, XmmRegister src);
void sqrtsd(XmmRegister dst, XmmRegister src);
void sqrtss(XmmRegister dst, XmmRegister src);
void xorpd(XmmRegister dst, const Address& src);
void xorpd(XmmRegister dst, XmmRegister src);
void xorps(XmmRegister dst, const Address& src);
void xorps(XmmRegister dst, XmmRegister src);
void andpd(XmmRegister dst, const Address& src);
void andpd(XmmRegister dst, XmmRegister src);
void orpd(XmmRegister dst, XmmRegister src);
void pextrd(Register dst, XmmRegister src, const Immediate& imm);
void pmovsxdq(XmmRegister dst, XmmRegister src);
void pcmpeqq(XmmRegister dst, XmmRegister src);
void pxor(XmmRegister dst, XmmRegister src);
enum RoundingMode {
kRoundToNearest = 0x0,
kRoundDown = 0x1,
kRoundUp = 0x2,
kRoundToZero = 0x3
};
void roundsd(XmmRegister dst, XmmRegister src, RoundingMode mode);
void flds(const Address& src);
void fstps(const Address& dst);
void fldl(const Address& src);
void fstpl(const Address& dst);
void fnstcw(const Address& dst);
void fldcw(const Address& src);
void fistpl(const Address& dst);
void fistps(const Address& dst);
void fildl(const Address& src);
void filds(const Address& src);
void fincstp();
void ffree(intptr_t value);
void fsin();
void fcos();
void fsincos();
void fptan();
void xchgl(Register dst, Register src);
void cmpw(const Address& address, const Immediate& imm);
void cmpb(const Address& address, const Immediate& imm);
void testl(Register reg1, Register reg2);
void testl(Register reg, const Immediate& imm);
void testb(const Address& address, const Immediate& imm);
// clang-format off
// Macro for handling common ALU instructions. Arguments to F:
// name, opcode, reversed opcode, opcode for the reg field of the modrm byte.
#define ALU_OPS(F) \
F(and, 0x23, 0x21, 4) \
F(or, 0x0b, 0x09, 1) \
F(xor, 0x33, 0x31, 6) \
F(add, 0x03, 0x01, 0) \
F(adc, 0x13, 0x11, 2) \
F(sub, 0x2b, 0x29, 5) \
F(sbb, 0x1b, 0x19, 3) \
F(cmp, 0x3b, 0x39, 7)
// clang-format on
#define DECLARE_ALU(op, opcode, opcode2, modrm_opcode) \
void op##l(Register dst, Register src) { Alu(4, opcode, dst, src); } \
void op##w(Register dst, Register src) { Alu(2, opcode, dst, src); } \
void op##l(Register dst, const Address& src) { Alu(4, opcode, dst, src); } \
void op##w(Register dst, const Address& src) { Alu(2, opcode, dst, src); } \
void op##l(const Address& dst, Register src) { Alu(4, opcode2, dst, src); } \
void op##w(const Address& dst, Register src) { Alu(2, opcode2, dst, src); } \
void op##l(Register dst, const Immediate& imm) { \
Alu(modrm_opcode, dst, imm); \
} \
void op##l(const Address& dst, const Immediate& imm) { \
Alu(modrm_opcode, dst, imm); \
}
ALU_OPS(DECLARE_ALU);
#undef DECLARE_ALU
#undef ALU_OPS
void cdq();
void idivl(Register reg);
void divl(Register reg);
void imull(Register dst, Register src);
void imull(Register reg, const Immediate& imm);
void imull(Register reg, const Address& address);
void imull(Register reg);
void imull(const Address& address);
void mull(Register reg);
void mull(const Address& address);
void incl(Register reg);
void incl(const Address& address);
void decl(Register reg);
void decl(const Address& address);
void shll(Register reg, const Immediate& imm);
void shll(Register operand, Register shifter);
void shll(const Address& operand, Register shifter);
void shrl(Register reg, const Immediate& imm);
void shrl(Register operand, Register shifter);
void sarl(Register reg, const Immediate& imm);
void sarl(Register operand, Register shifter);
void sarl(const Address& address, Register shifter);
void shldl(Register dst, Register src, Register shifter);
void shldl(Register dst, Register src, const Immediate& imm);
void shldl(const Address& operand, Register src, Register shifter);
void shrdl(Register dst, Register src, Register shifter);
void shrdl(Register dst, Register src, const Immediate& imm);
void shrdl(const Address& dst, Register src, Register shifter);
void negl(Register reg);
void notl(Register reg);
void bsrl(Register dst, Register src);
void bt(Register base, Register offset);
void bt(Register base, int bit);
void enter(const Immediate& imm);
void leave();
void ret();
void ret(const Immediate& imm);
// 'size' indicates size in bytes and must be in the range 1..8.
void nop(int size = 1);
void int3();
void hlt();
static uword GetBreakInstructionFiller() { return 0xCCCCCCCC; }
void j(Condition condition, Label* label, bool near = kFarJump);
void j(Condition condition, const ExternalLabel* label);
void jmp(Register reg);
void jmp(Label* label, bool near = kFarJump);
void jmp(const ExternalLabel* label);
void lock();
void cmpxchgl(const Address& address, Register reg);
void cpuid();
/*
* Macros for High-level operations and implemented on all architectures.
*/
void CompareRegisters(Register a, Register b);
void BranchIf(Condition condition, Label* label) { j(condition, label); }
void LoadField(Register dst, FieldAddress address) { movw(dst, address); }
// Issues a move instruction if 'to' is not the same as 'from'.
void MoveRegister(Register to, Register from);
void PushRegister(Register r);
void PopRegister(Register r);
void AddImmediate(Register reg, const Immediate& imm);
void SubImmediate(Register reg, const Immediate& imm);
void CompareImmediate(Register reg, int32_t immediate) {
cmpl(reg, Immediate(immediate));
}
void Drop(intptr_t stack_elements);
void LoadIsolate(Register dst);
void LoadObject(Register dst,
const Object& object,
bool movable_referent = false);
// If 'object' is a large Smi, xor it with a per-assembler cookie value to
// prevent user-controlled immediates from appearing in the code stream.
void LoadObjectSafely(Register dst, const Object& object);
void PushObject(const Object& object);
void CompareObject(Register reg, const Object& object);
void LoadDoubleConstant(XmmRegister dst, double value);
enum CanBeSmi {
kValueIsNotSmi,
kValueCanBeSmi,
};
// Store into a heap object and apply the generational write barrier. (Unlike
// the other architectures, this does not apply the incremental write barrier,
// and so concurrent marking is not enabled for now on IA32.) All stores into
// heap objects must pass through this function or, if the value can be proven
// either Smi or old-and-premarked, its NoBarrier variants.
// Destroys the value register.
void StoreIntoObject(Register object, // Object we are storing into.
const Address& dest, // Where we are storing into.
Register value, // Value we are storing.
CanBeSmi can_value_be_smi = kValueCanBeSmi);
void StoreIntoObjectNoBarrier(Register object,
const Address& dest,
Register value);
void StoreIntoObjectNoBarrier(Register object,
const Address& dest,
const Object& value);
// Stores a Smi value into a heap object field that always contains a Smi.
void StoreIntoSmiField(const Address& dest, Register value);
void ZeroInitSmiField(const Address& dest);
// Increments a Smi field. Leaves flags in same state as an 'addl'.
void IncrementSmiField(const Address& dest, int32_t increment);
void DoubleNegate(XmmRegister d);
void FloatNegate(XmmRegister f);
void DoubleAbs(XmmRegister reg);
void LockCmpxchgl(const Address& address, Register reg) {
lock();
cmpxchgl(address, reg);
}
void EnterFrame(intptr_t frame_space);
void LeaveFrame();
void ReserveAlignedFrameSpace(intptr_t frame_space);
// Create a frame for calling into runtime that preserves all volatile
// registers. Frame's RSP is guaranteed to be correctly aligned and
// frame_space bytes are reserved under it.
void EnterCallRuntimeFrame(intptr_t frame_space);
void LeaveCallRuntimeFrame();
void CallRuntime(const RuntimeEntry& entry, intptr_t argument_count);
void Call(const StubEntry& stub_entry, bool movable_target = false);
void CallToRuntime();
void CallNullErrorShared(bool save_fpu_registers) { UNREACHABLE(); }
void Jmp(const StubEntry& stub_entry);
void J(Condition condition, const StubEntry& stub_entry);
/*
* Loading and comparing classes of objects.
*/
void LoadClassId(Register result, Register object);
void LoadClassById(Register result, Register class_id);
void CompareClassId(Register object, intptr_t class_id, Register scratch);
void LoadClassIdMayBeSmi(Register result, Register object);
void LoadTaggedClassIdMayBeSmi(Register result, Register object);
void SmiUntagOrCheckClass(Register object,
intptr_t class_id,
Register scratch,
Label* is_smi);
static Address ElementAddressForIntIndex(bool is_external,
intptr_t cid,
intptr_t index_scale,
Register array,
intptr_t index,
intptr_t extra_disp = 0);
static Address ElementAddressForRegIndex(bool is_external,
intptr_t cid,
intptr_t index_scale,
Register array,
Register index,
intptr_t extra_disp = 0);
static Address VMTagAddress() {
return Address(THR, Thread::vm_tag_offset());
}
/*
* Misc. functionality
*/
void SmiTag(Register reg) { addl(reg, reg); }
void SmiUntag(Register reg) { sarl(reg, Immediate(kSmiTagSize)); }
void BranchIfNotSmi(Register reg, Label* label) {
testl(reg, Immediate(kSmiTagMask));
j(NOT_ZERO, label);
}
void BranchIfSmi(Register reg, Label* label) {
testl(reg, Immediate(kSmiTagMask));
j(ZERO, label);
}
void Align(intptr_t alignment, intptr_t offset);
void Bind(Label* label);
void Jump(Label* label) { jmp(label); }
// Address of code at offset.
uword CodeAddress(intptr_t offset) { return buffer_.Address(offset); }
intptr_t CodeSize() const { return buffer_.Size(); }
intptr_t prologue_offset() const { return prologue_offset_; }
bool has_single_entry_point() const { return true; }
// Count the fixups that produce a pointer offset, without processing
// the fixups.
intptr_t CountPointerOffsets() const { return buffer_.CountPointerOffsets(); }
const ZoneGrowableArray<intptr_t>& GetPointerOffsets() const {
return buffer_.pointer_offsets();
}
ObjectPoolWrapper& object_pool_wrapper() { return object_pool_wrapper_; }
RawObjectPool* MakeObjectPool() {
return object_pool_wrapper_.MakeObjectPool();
}
void FinalizeInstructions(const MemoryRegion& region) {
buffer_.FinalizeInstructions(region);
}
// Set up a Dart frame on entry with a frame pointer and PC information to
// enable easy access to the RawInstruction object of code corresponding
// to this frame.
// The dart frame layout is as follows:
// ....
// ret PC
// saved EBP <=== EBP
// pc (used to derive the RawInstruction Object of the dart code)
// locals space <=== ESP
// .....
// This code sets this up with the sequence:
// pushl ebp
// movl ebp, esp
// call L
// L: <code to adjust saved pc if there is any intrinsification code>
// .....
void EnterDartFrame(intptr_t frame_size);
// Set up a Dart frame for a function compiled for on-stack replacement.
// The frame layout is a normal Dart frame, but the frame is partially set
// up on entry (it is the frame of the unoptimized code).
void EnterOsrFrame(intptr_t extra_size);
// Set up a stub frame so that the stack traversal code can easily identify
// a stub frame.
// The stub frame layout is as follows:
// ....
// ret PC
// saved EBP
// 0 (used to indicate frame is a stub frame)
// .....
// This code sets this up with the sequence:
// pushl ebp
// movl ebp, esp
// pushl immediate(0)
// .....
void EnterStubFrame();
static const intptr_t kEnterStubFramePushedWords = 2;
// Instruction pattern from entrypoint is used in dart frame prologs
// to set up the frame and save a PC which can be used to figure out the
// RawInstruction object corresponding to the code running in the frame.
// entrypoint:
// pushl ebp (size is 1 byte)
// movl ebp, esp (size is 2 bytes)
// call L (size is 5 bytes)
// L:
static const intptr_t kEntryPointToPcMarkerOffset = 8;
static intptr_t EntryPointToPcMarkerOffset() {
return kEntryPointToPcMarkerOffset;
}
// If allocation tracing for |cid| is enabled, will jump to |trace| label,
// which will allocate in the runtime where tracing occurs.
void MaybeTraceAllocation(intptr_t cid,
Register temp_reg,
Label* trace,
bool near_jump);
void UpdateAllocationStats(intptr_t cid,
Register temp_reg,
Heap::Space space);
void UpdateAllocationStatsWithSize(intptr_t cid,
Register size_reg,
Register temp_reg,
Heap::Space space);
void UpdateAllocationStatsWithSize(intptr_t cid,
intptr_t instance_size,
Register temp_reg,
Heap::Space space);
// Inlined allocation of an instance of class 'cls', code has no runtime
// calls. Jump to 'failure' if the instance cannot be allocated here.
// Allocated instance is returned in 'instance_reg'.
// Only the tags field of the object is initialized.
void TryAllocate(const Class& cls,
Label* failure,
bool near_jump,
Register instance_reg,
Register temp_reg);
void TryAllocateArray(intptr_t cid,
intptr_t instance_size,
Label* failure,
bool near_jump,
Register instance,
Register end_address,
Register temp);
// Debugging and bringup support.
void Breakpoint() { int3(); }
void Stop(const char* message);
void Unimplemented(const char* message);
void Untested(const char* message);
void Unreachable(const char* message);
static void InitializeMemoryWithBreakpoints(uword data, intptr_t length);
void Comment(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
static bool EmittingComments();
const Code::Comments& GetCodeComments() const;
static const char* RegisterName(Register reg);
static const char* FpuRegisterName(FpuRegister reg);
// Smis that do not fit into 17 bits (16 bits of payload) are unsafe.
static bool IsSafeSmi(const Object& object) {
if (!object.IsSmi()) {
return false;
}
if (Utils::IsInt(17, reinterpret_cast<intptr_t>(object.raw()))) {
return true;
}
// Single bit smis (powers of two) and corresponding masks are safe.
const intptr_t value = Smi::Cast(object).Value();
if (Utils::IsPowerOfTwo(value) || Utils::IsPowerOfTwo(value + 1)) {
return true;
}
return false;
}
static bool IsSafe(const Object& object) {
return !object.IsSmi() || IsSafeSmi(object);
}
void set_code_object(const Code& code) { code_ ^= code.raw(); }
void PushCodeObject();
private:
class CodeComment : public ZoneAllocated {
public:
CodeComment(intptr_t pc_offset, const String& comment)
: pc_offset_(pc_offset), comment_(comment) {}
intptr_t pc_offset() const { return pc_offset_; }
const String& comment() const { return comment_; }
private:
intptr_t pc_offset_;
const String& comment_;
DISALLOW_COPY_AND_ASSIGN(CodeComment);
};
void Alu(int bytes, uint8_t opcode, Register dst, Register src);
void Alu(uint8_t modrm_opcode, Register dst, const Immediate& imm);
void Alu(int bytes, uint8_t opcode, Register dst, const Address& src);
void Alu(int bytes, uint8_t opcode, const Address& dst, Register src);
void Alu(uint8_t modrm_opcode, const Address& dst, const Immediate& imm);
inline void EmitUint8(uint8_t value);
inline void EmitInt32(int32_t value);
inline void EmitRegisterOperand(int rm, int reg);
inline void EmitXmmRegisterOperand(int rm, XmmRegister reg);
inline void EmitFixup(AssemblerFixup* fixup);
inline void EmitOperandSizeOverride();
void EmitOperand(int rm, const Operand& operand);
void EmitImmediate(const Immediate& imm);
void EmitComplex(int rm, const Operand& operand, const Immediate& immediate);
void EmitLabel(Label* label, intptr_t instruction_size);
void EmitLabelLink(Label* label);
void EmitNearLabelLink(Label* label);
void EmitGenericShift(int rm, Register reg, const Immediate& imm);
void EmitGenericShift(int rm, const Operand& operand, Register shifter);
enum BarrierFilterMode {
// Filter falls through into the barrier update code. Target label
// is a "after-store" label.
kJumpToNoUpdate,
// Filter falls through to the "after-store" code. Target label
// is barrier update code label.
kJumpToBarrier,
};
void StoreIntoObjectFilter(Register object,
Register value,
Label* label,
CanBeSmi can_be_smi,
BarrierFilterMode barrier_filter_mode);
void UnverifiedStoreOldObject(const Address& dest, const Object& value);
int32_t jit_cookie();
AssemblerBuffer buffer_;
ObjectPoolWrapper object_pool_wrapper_;
intptr_t prologue_offset_;
int32_t jit_cookie_;
GrowableArray<CodeComment*> comments_;
Code& code_;
DISALLOW_ALLOCATION();
DISALLOW_COPY_AND_ASSIGN(Assembler);
};
inline void Assembler::EmitUint8(uint8_t value) {
buffer_.Emit<uint8_t>(value);
}
inline void Assembler::EmitInt32(int32_t value) {
buffer_.Emit<int32_t>(value);
}
inline void Assembler::EmitRegisterOperand(int rm, int reg) {
ASSERT(rm >= 0 && rm < 8);
buffer_.Emit<uint8_t>(0xC0 + (rm << 3) + reg);
}
inline void Assembler::EmitXmmRegisterOperand(int rm, XmmRegister reg) {
EmitRegisterOperand(rm, static_cast<Register>(reg));
}
inline void Assembler::EmitFixup(AssemblerFixup* fixup) {
buffer_.EmitFixup(fixup);
}
inline void Assembler::EmitOperandSizeOverride() {
EmitUint8(0x66);
}
} // namespace dart
#endif // RUNTIME_VM_COMPILER_ASSEMBLER_ASSEMBLER_IA32_H_