Move backend specific files to separate directories.

src/assembler-ia32.h

-// Copyright (c) 1994-2006 Sun Microsystems Inc.
-// All Rights Reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// - Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-//
-// - Redistribution in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of Sun Microsystems or the names of contributors may
-// be used to endorse or promote products derived from this software without
-// specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// The original source code covered by the above license above has been
-// modified significantly by Google Inc.
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
-
-// A light-weight IA32 Assembler.
-
-#ifndef V8_ASSEMBLER_IA32_H_
-#define V8_ASSEMBLER_IA32_H_
-
-namespace v8 { namespace internal {
-
-// CPU Registers.
-//
-// 1) We would prefer to use an enum, but enum values are assignment-
-// compatible with int, which has caused code-generation bugs.
-//
-// 2) We would prefer to use a class instead of a struct but we don't like
-// the register initialization to depend on the particular initialization
-// order (which appears to be different on OS X, Linux, and Windows for the
-// installed versions of C++ we tried). Using a struct permits C-style
-// "initialization". Also, the Register objects cannot be const as this
-// forces initialization stubs in MSVC, making us dependent on initialization
-// order.
-//
-// 3) By not using an enum, we are possibly preventing the compiler from
-// doing certain constant folds, which may significantly reduce the
-// code generated for some assembly instructions (because they boil down
-// to a few constants). If this is a problem, we could change the code
-// such that we use an enum in optimized mode, and the struct in debug
-// mode. This way we get the compile-time error checking in debug mode
-// and best performance in optimized code.
-//
-struct Register {
-  bool is_valid() const  { return 0 <= code_ && code_ < 8; }
-  bool is(Register reg) const  { return code_ == reg.code_; }
-  // eax, ebx, ecx and edx are byte registers, the rest are not.
-  bool is_byte_register() const  { return code_ <= 3; }
-  int code() const  {
-    ASSERT(is_valid());
-    return code_;
-  }
-  int bit() const  {
-    ASSERT(is_valid());
-    return 1 << code_;
-  }
-
-  // (unfortunately we can't make this private in a struct)
-  int code_;
-};
-
-const int kNumRegisters = 8;
-
-extern Register eax;
-extern Register ecx;
-extern Register edx;
-extern Register ebx;
-extern Register esp;
-extern Register ebp;
-extern Register esi;
-extern Register edi;
-extern Register no_reg;
-
-
-struct XMMRegister {
-  bool is_valid() const  { return 0 <= code_ && code_ < 2; }  // currently
-  int code() const  {
-    ASSERT(is_valid());
-    return code_;
-  }
-
-  int code_;
-};
-
-extern XMMRegister xmm0;
-extern XMMRegister xmm1;
-extern XMMRegister xmm2;
-extern XMMRegister xmm3;
-extern XMMRegister xmm4;
-extern XMMRegister xmm5;
-extern XMMRegister xmm6;
-extern XMMRegister xmm7;
-
-enum Condition {
-  // any value < 0 is considered no_condition
-  no_condition  = -1,
-
-  overflow      =  0,
-  no_overflow   =  1,
-  below         =  2,
-  above_equal   =  3,
-  equal         =  4,
-  not_equal     =  5,
-  below_equal   =  6,
-  above         =  7,
-  negative      =  8,
-  positive      =  9,
-  parity_even   = 10,
-  parity_odd    = 11,
-  less          = 12,
-  greater_equal = 13,
-  less_equal    = 14,
-  greater       = 15,
-
-  // aliases
-  carry         = below,
-  not_carry     = above_equal,
-  zero          = equal,
-  not_zero      = not_equal,
-  sign          = negative,
-  not_sign      = positive
-};
-
-
-// Returns the equivalent of !cc.
-// Negation of the default no_condition (-1) results in a non-default
-// no_condition value (-2). As long as tests for no_condition check
-// for condition < 0, this will work as expected.
-inline Condition NegateCondition(Condition cc);
-
-// Corresponds to transposing the operands of a comparison.
-inline Condition ReverseCondition(Condition cc) {
-  switch (cc) {
-    case below:
-      return above;
-    case above:
-      return below;
-    case above_equal:
-      return below_equal;
-    case below_equal:
-      return above_equal;
-    case less:
-      return greater;
-    case greater:
-      return less;
-    case greater_equal:
-      return less_equal;
-    case less_equal:
-      return greater_equal;
-    default:
-      return cc;
-  };
-}
-
-enum Hint {
-  no_hint = 0,
-  not_taken = 0x2e,
-  taken = 0x3e
-};
-
-// The result of negating a hint is as if the corresponding condition
-// were negated by NegateCondition.  That is, no_hint is mapped to
-// itself and not_taken and taken are mapped to each other.
-inline Hint NegateHint(Hint hint) {
-  return (hint == no_hint)
-      ? no_hint
-      : ((hint == not_taken) ? taken : not_taken);
-}
-
-
-// -----------------------------------------------------------------------------
-// Machine instruction Immediates
-
-class Immediate BASE_EMBEDDED {
- public:
-  inline explicit Immediate(int x);
-  inline explicit Immediate(const char* s);
-  inline explicit Immediate(const ExternalReference& ext);
-  inline explicit Immediate(Handle<Object> handle);
-  inline explicit Immediate(Smi* value);
-
-  static Immediate CodeRelativeOffset(Label* label) {
-    return Immediate(label);
-  }
-
-  bool is_zero() const { return x_ == 0 && rmode_ == RelocInfo::NONE; }
-  bool is_int8() const {
-    return -128 <= x_ && x_ < 128 && rmode_ == RelocInfo::NONE;
-  }
-  bool is_int16() const {
-    return -32768 <= x_ && x_ < 32768 && rmode_ == RelocInfo::NONE;
-  }
-
- private:
-  inline explicit Immediate(Label* value);
-
-  int x_;
-  RelocInfo::Mode rmode_;
-
-  friend class Assembler;
-};
-
-
-// -----------------------------------------------------------------------------
-// Machine instruction Operands
-
-enum ScaleFactor {
-  times_1 = 0,
-  times_2 = 1,
-  times_4 = 2,
-  times_8 = 3
-};
-
-
-class Operand BASE_EMBEDDED {
- public:
-  // reg
-  INLINE(explicit Operand(Register reg));
-
-  // [disp/r]
-  INLINE(explicit Operand(int32_t disp, RelocInfo::Mode rmode));
-  // disp only must always be relocated
-
-  // [base + disp/r]
-  explicit Operand(Register base, int32_t disp,
-                   RelocInfo::Mode rmode = RelocInfo::NONE);
-
-  // [base + index*scale + disp/r]
-  explicit Operand(Register base,
-                   Register index,
-                   ScaleFactor scale,
-                   int32_t disp,
-                   RelocInfo::Mode rmode = RelocInfo::NONE);
-
-  // [index*scale + disp/r]
-  explicit Operand(Register index,
-                   ScaleFactor scale,
-                   int32_t disp,
-                   RelocInfo::Mode rmode = RelocInfo::NONE);
-
-  static Operand StaticVariable(const ExternalReference& ext) {
-    return Operand(reinterpret_cast<int32_t>(ext.address()),
-                   RelocInfo::EXTERNAL_REFERENCE);
-  }
-
-  static Operand StaticArray(Register index,
-                             ScaleFactor scale,
-                             const ExternalReference& arr) {
-    return Operand(index, scale, reinterpret_cast<int32_t>(arr.address()),
-                   RelocInfo::EXTERNAL_REFERENCE);
-  }
-
-  // Returns true if this Operand is a wrapper for the specified register.
-  bool is_reg(Register reg) const;
-
- private:
-  byte buf_[6];
-  // The number of bytes in buf_.
-  unsigned int len_;
-  // Only valid if len_ > 4.
-  RelocInfo::Mode rmode_;
-
-  // Set the ModRM byte without an encoded 'reg' register. The
-  // register is encoded later as part of the emit_operand operation.
-  inline void set_modrm(int mod, Register rm);
-
-  inline void set_sib(ScaleFactor scale, Register index, Register base);
-  inline void set_disp8(int8_t disp);
-  inline void set_dispr(int32_t disp, RelocInfo::Mode rmode);
-
-  friend class Assembler;
-};
-
-
-// -----------------------------------------------------------------------------
-// A Displacement describes the 32bit immediate field of an instruction which
-// may be used together with a Label in order to refer to a yet unknown code
-// position. Displacements stored in the instruction stream are used to describe
-// the instruction and to chain a list of instructions using the same Label.
-// A Displacement contains 2 different fields:
-//
-// next field: position of next displacement in the chain (0 = end of list)
-// type field: instruction type
-//
-// A next value of null (0) indicates the end of a chain (note that there can
-// be no displacement at position zero, because there is always at least one
-// instruction byte before the displacement).
-//
-// Displacement _data field layout
-//
-// |31.....2|1......0|
-// [  next  |  type  |
-
-class Displacement BASE_EMBEDDED {
- public:
-  enum Type {
-    UNCONDITIONAL_JUMP,
-    CODE_RELATIVE,
-    OTHER
-  };
-
-  int data() const { return data_; }
-  Type type() const { return TypeField::decode(data_); }
-  void next(Label* L) const {
-    int n = NextField::decode(data_);
-    n > 0 ? L->link_to(n) : L->Unuse();
-  }
-  void link_to(Label* L) { init(L, type()); }
-
-  explicit Displacement(int data) { data_ = data; }
-
-  Displacement(Label* L, Type type) { init(L, type); }
-
-  void print() {
-    PrintF("%s (%x) ", (type() == UNCONDITIONAL_JUMP ? "jmp" : "[other]"),
-                       NextField::decode(data_));
-  }
-
- private:
-  int data_;
-
-  class TypeField: public BitField<Type, 0, 2> {};
-  class NextField: public BitField<int,  2, 32-2> {};
-
-  void init(Label* L, Type type);
-};
-
-
-
-// CpuFeatures keeps track of which features are supported by the target CPU.
-// Supported features must be enabled by a Scope before use.
-// Example:
-//   if (CpuFeatures::IsSupported(SSE2)) {
-//     CpuFeatures::Scope fscope(SSE2);
-//     // Generate SSE2 floating point code.
-//   } else {
-//     // Generate standard x87 floating point code.
-//   }
-class CpuFeatures : public AllStatic {
- public:
-  // Feature flags bit positions. They are mostly based on the CPUID spec.
-  // (We assign CPUID itself to one of the currently reserved bits --
-  // feel free to change this if needed.)
-  enum Feature { SSE3 = 32, SSE2 = 26, CMOV = 15, RDTSC = 4, CPUID = 10 };
-  // Detect features of the target CPU. Set safe defaults if the serializer
-  // is enabled (snapshots must be portable).
-  static void Probe();
-  // Check whether a feature is supported by the target CPU.
-  static bool IsSupported(Feature f) {
-    return (supported_ & (static_cast<uint64_t>(1) << f)) != 0;
-  }
-  // Check whether a feature is currently enabled.
-  static bool IsEnabled(Feature f) {
-    return (enabled_ & (static_cast<uint64_t>(1) << f)) != 0;
-  }
-  // Enable a specified feature within a scope.
-  class Scope BASE_EMBEDDED {
-#ifdef DEBUG
-   public:
-    explicit Scope(Feature f) {
-      ASSERT(CpuFeatures::IsSupported(f));
-      old_enabled_ = CpuFeatures::enabled_;
-      CpuFeatures::enabled_ |= (static_cast<uint64_t>(1) << f);
-    }
-    ~Scope() { CpuFeatures::enabled_ = old_enabled_; }
-   private:
-    uint64_t old_enabled_;
-#else
-   public:
-    explicit Scope(Feature f) {}
-#endif
-  };
- private:
-  static uint64_t supported_;
-  static uint64_t enabled_;
-};
-
-
-class Assembler : public Malloced {
- private:
-  // The relocation writer's position is kGap bytes below the end of
-  // the generated instructions. This leaves enough space for the
-  // longest possible ia32 instruction (17 bytes as of 9/26/06) and
-  // allows for a single, fast space check per instruction.
-  static const int kGap = 32;
-
- public:
-  // Create an assembler. Instructions and relocation information are emitted
-  // into a buffer, with the instructions starting from the beginning and the
-  // relocation information starting from the end of the buffer. See CodeDesc
-  // for a detailed comment on the layout (globals.h).
-  //
-  // If the provided buffer is NULL, the assembler allocates and grows its own
-  // buffer, and buffer_size determines the initial buffer size. The buffer is
-  // owned by the assembler and deallocated upon destruction of the assembler.
-  //
-  // If the provided buffer is not NULL, the assembler uses the provided buffer
-  // for code generation and assumes its size to be buffer_size. If the buffer
-  // is too small, a fatal error occurs. No deallocation of the buffer is done
-  // upon destruction of the assembler.
-  Assembler(void* buffer, int buffer_size);
-  ~Assembler();
-
-  // GetCode emits any pending (non-emitted) code and fills the descriptor
-  // desc. GetCode() is idempotent; it returns the same result if no other
-  // Assembler functions are invoked in between GetCode() calls.
-  void GetCode(CodeDesc* desc);
-
-  // Read/Modify the code target in the branch/call instruction at pc.
-  inline static Address target_address_at(Address pc);
-  inline static void set_target_address_at(Address pc, Address target);
-
-  // Distance between the address of the code target in the call instruction
-  // and the return address
-  static const int kTargetAddrToReturnAddrDist = kPointerSize;
-
-
-  // ---------------------------------------------------------------------------
-  // Code generation
-  //
-  // - function names correspond one-to-one to ia32 instruction mnemonics
-  // - unless specified otherwise, instructions operate on 32bit operands
-  // - instructions on 8bit (byte) operands/registers have a trailing '_b'
-  // - instructions on 16bit (word) operands/registers have a trailing '_w'
-  // - naming conflicts with C++ keywords are resolved via a trailing '_'
-
-  // NOTE ON INTERFACE: Currently, the interface is not very consistent
-  // in the sense that some operations (e.g. mov()) can be called in more
-  // the one way to generate the same instruction: The Register argument
-  // can in some cases be replaced with an Operand(Register) argument.
-  // This should be cleaned up and made more orthogonal. The questions
-  // is: should we always use Operands instead of Registers where an
-  // Operand is possible, or should we have a Register (overloaded) form
-  // instead? We must be careful to make sure that the selected instruction
-  // is obvious from the parameters to avoid hard-to-find code generation
-  // bugs.
-
-  // Insert the smallest number of nop instructions
-  // possible to align the pc offset to a multiple
-  // of m. m must be a power of 2.
-  void Align(int m);
-
-  // Stack
-  void pushad();
-  void popad();
-
-  void pushfd();
-  void popfd();
-
-  void push(const Immediate& x);
-  void push(Register src);
-  void push(const Operand& src);
-  void push(Label* label, RelocInfo::Mode relocation_mode);
-
-  void pop(Register dst);
-  void pop(const Operand& dst);
-
-  void enter(const Immediate& size);
-  void leave();
-
-  // Moves
-  void mov_b(Register dst, const Operand& src);
-  void mov_b(const Operand& dst, int8_t imm8);
-  void mov_b(const Operand& dst, Register src);
-
-  void mov_w(Register dst, const Operand& src);
-  void mov_w(const Operand& dst, Register src);
-
-  void mov(Register dst, int32_t imm32);
-  void mov(Register dst, const Immediate& x);
-  void mov(Register dst, Handle<Object> handle);
-  void mov(Register dst, const Operand& src);
-  void mov(Register dst, Register src);
-  void mov(const Operand& dst, const Immediate& x);
-  void mov(const Operand& dst, Handle<Object> handle);
-  void mov(const Operand& dst, Register src);
-
-  void movsx_b(Register dst, const Operand& src);
-
-  void movsx_w(Register dst, const Operand& src);
-
-  void movzx_b(Register dst, const Operand& src);
-
-  void movzx_w(Register dst, const Operand& src);
-
-  // Conditional moves
-  void cmov(Condition cc, Register dst, int32_t imm32);
-  void cmov(Condition cc, Register dst, Handle<Object> handle);
-  void cmov(Condition cc, Register dst, const Operand& src);
-
-  // Exchange two registers
-  void xchg(Register dst, Register src);
-
-  // Arithmetics
-  void adc(Register dst, int32_t imm32);
-  void adc(Register dst, const Operand& src);
-
-  void add(Register dst, const Operand& src);
-  void add(const Operand& dst, const Immediate& x);
-
-  void and_(Register dst, int32_t imm32);
-  void and_(Register dst, const Operand& src);
-  void and_(const Operand& src, Register dst);
-  void and_(const Operand& dst, const Immediate& x);
-
-  void cmpb(const Operand& op, int8_t imm8);
-  void cmpb_al(const Operand& op);
-  void cmpw_ax(const Operand& op);
-  void cmpw(const Operand& op, Immediate imm16);
-  void cmp(Register reg, int32_t imm32);
-  void cmp(Register reg, Handle<Object> handle);
-  void cmp(Register reg, const Operand& op);
-  void cmp(const Operand& op, const Immediate& imm);
-
-  void dec_b(Register dst);
-
-  void dec(Register dst);
-  void dec(const Operand& dst);
-
-  void cdq();
-
-  void idiv(Register src);
-
-  void imul(Register dst, const Operand& src);
-  void imul(Register dst, Register src, int32_t imm32);
-
-  void inc(Register dst);
-  void inc(const Operand& dst);
-
-  void lea(Register dst, const Operand& src);
-
-  void mul(Register src);
-
-  void neg(Register dst);
-
-  void not_(Register dst);
-
-  void or_(Register dst, int32_t imm32);
-  void or_(Register dst, const Operand& src);
-  void or_(const Operand& dst, Register src);
-  void or_(const Operand& dst, const Immediate& x);
-
-  void rcl(Register dst, uint8_t imm8);
-
-  void sar(Register dst, uint8_t imm8);
-  void sar(Register dst);
-
-  void sbb(Register dst, const Operand& src);
-
-  void shld(Register dst, const Operand& src);
-
-  void shl(Register dst, uint8_t imm8);
-  void shl(Register dst);
-
-  void shrd(Register dst, const Operand& src);
-
-  void shr(Register dst, uint8_t imm8);
-  void shr(Register dst);
-  void shr_cl(Register dst);
-
-  void sub(const Operand& dst, const Immediate& x);
-  void sub(Register dst, const Operand& src);
-  void sub(const Operand& dst, Register src);
-
-  void test(Register reg, const Immediate& imm);
-  void test(Register reg, const Operand& op);
-  void test(const Operand& op, const Immediate& imm);
-
-  void xor_(Register dst, int32_t imm32);
-  void xor_(Register dst, const Operand& src);
-  void xor_(const Operand& src, Register dst);
-  void xor_(const Operand& dst, const Immediate& x);
-
-  // Bit operations.
-  void bt(const Operand& dst, Register src);
-  void bts(const Operand& dst, Register src);
-
-  // Miscellaneous
-  void hlt();
-  void int3();
-  void nop();
-  void rdtsc();
-  void ret(int imm16);
-
-  // Label operations & relative jumps (PPUM Appendix D)
-  //
-  // Takes a branch opcode (cc) and a label (L) and generates
-  // either a backward branch or a forward branch and links it
-  // to the label fixup chain. Usage:
-  //
-  // Label L;    // unbound label
-  // j(cc, &L);  // forward branch to unbound label
-  // bind(&L);   // bind label to the current pc
-  // j(cc, &L);  // backward branch to bound label
-  // bind(&L);   // illegal: a label may be bound only once
-  //
-  // Note: The same Label can be used for forward and backward branches
-  // but it may be bound only once.
-
-  void bind(Label* L);  // binds an unbound label L to the current code position
-
-  // Calls
-  void call(Label* L);
-  void call(byte* entry, RelocInfo::Mode rmode);
-  void call(const Operand& adr);
-  void call(Handle<Code> code, RelocInfo::Mode rmode);
-
-  // Jumps
-  void jmp(Label* L);  // unconditional jump to L
-  void jmp(byte* entry, RelocInfo::Mode rmode);
-  void jmp(const Operand& adr);
-  void jmp(Handle<Code> code, RelocInfo::Mode rmode);
-
-  // Conditional jumps
-  void j(Condition cc, Label* L, Hint hint = no_hint);
-  void j(Condition cc, byte* entry, RelocInfo::Mode rmode, Hint hint = no_hint);
-  void j(Condition cc, Handle<Code> code, Hint hint = no_hint);
-
-  // Floating-point operations
-  void fld(int i);
-
-  void fld1();
-  void fldz();
-
-  void fld_s(const Operand& adr);
-  void fld_d(const Operand& adr);
-
-  void fstp_s(const Operand& adr);
-  void fstp_d(const Operand& adr);
-
-  void fild_s(const Operand& adr);
-  void fild_d(const Operand& adr);
-
-  void fist_s(const Operand& adr);
-
-  void fistp_s(const Operand& adr);
-  void fistp_d(const Operand& adr);
-
-  void fisttp_s(const Operand& adr);
-
-  void fabs();
-  void fchs();
-
-  void fadd(int i);
-  void fsub(int i);
-  void fmul(int i);
-  void fdiv(int i);
-
-  void fisub_s(const Operand& adr);
-
-  void faddp(int i = 1);
-  void fsubp(int i = 1);
-  void fsubrp(int i = 1);
-  void fmulp(int i = 1);
-  void fdivp(int i = 1);
-  void fprem();
-  void fprem1();
-
-  void fxch(int i = 1);
-  void fincstp();
-  void ffree(int i = 0);
-
-  void ftst();
-  void fucomp(int i);
-  void fucompp();
-  void fcompp();
-  void fnstsw_ax();
-  void fwait();
-  void fnclex();
-
-  void frndint();
-
-  void sahf();
-  void setcc(Condition cc, Register reg);
-
-  void cpuid();
-
-  // SSE2 instructions
-  void cvttss2si(Register dst, const Operand& src);
-  void cvttsd2si(Register dst, const Operand& src);
-
-  void cvtsi2sd(XMMRegister dst, const Operand& src);
-
-  void addsd(XMMRegister dst, XMMRegister src);
-  void subsd(XMMRegister dst, XMMRegister src);
-  void mulsd(XMMRegister dst, XMMRegister src);
-  void divsd(XMMRegister dst, XMMRegister src);
-
-  // Use either movsd or movlpd.
-  void movdbl(XMMRegister dst, const Operand& src);
-  void movdbl(const Operand& dst, XMMRegister src);
-
-  // Debugging
-  void Print();
-
-  // Check the code size generated from label to here.
-  int SizeOfCodeGeneratedSince(Label* l) { return pc_offset() - l->pos(); }
-
-  // Mark address of the ExitJSFrame code.
-  void RecordJSReturn();
-
-  // Record a comment relocation entry that can be used by a disassembler.
-  // Use --debug_code to enable.
-  void RecordComment(const char* msg);
-
-  void RecordPosition(int pos);
-  void RecordStatementPosition(int pos);
-  void WriteRecordedPositions();
-
-  // Writes a single word of data in the code stream.
-  // Used for inline tables, e.g., jump-tables.
-  void dd(uint32_t data, RelocInfo::Mode reloc_info);
-
-  // Writes the absolute address of a bound label at the given position in
-  // the generated code. That positions should have the relocation mode
-  // internal_reference!
-  void WriteInternalReference(int position, const Label& bound_label);
-
-  int pc_offset() const  { return pc_ - buffer_; }
-  int current_statement_position() const { return current_statement_position_; }
-  int current_position() const  { return current_position_; }
-
-  // Check if there is less than kGap bytes available in the buffer.
-  // If this is the case, we need to grow the buffer before emitting
-  // an instruction or relocation information.
-  inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; }
-
-  // Get the number of bytes available in the buffer.
-  inline int available_space() const { return reloc_info_writer.pos() - pc_; }
-
-  // Avoid overflows for displacements etc.
-  static const int kMaximalBufferSize = 512*MB;
-  static const int kMinimalBufferSize = 4*KB;
-
- protected:
-  void movsd(XMMRegister dst, const Operand& src);
-  void movsd(const Operand& dst, XMMRegister src);
-
-  void emit_sse_operand(XMMRegister reg, const Operand& adr);
-  void emit_sse_operand(XMMRegister dst, XMMRegister src);
-
-
- private:
-  byte* addr_at(int pos)  { return buffer_ + pos; }
-  byte byte_at(int pos)  { return buffer_[pos]; }
-  uint32_t long_at(int pos)  {
-    return *reinterpret_cast<uint32_t*>(addr_at(pos));
-  }
-  void long_at_put(int pos, uint32_t x)  {
-    *reinterpret_cast<uint32_t*>(addr_at(pos)) = x;
-  }
-
-  // code emission
-  void GrowBuffer();
-  inline void emit(uint32_t x);
-  inline void emit(Handle<Object> handle);
-  inline void emit(uint32_t x, RelocInfo::Mode rmode);
-  inline void emit(const Immediate& x);
-  inline void emit_w(const Immediate& x);
-
-  // Emit the code-object-relative offset of the label's position
-  inline void emit_code_relative_offset(Label* label);
-
-  // instruction generation
-  void emit_arith_b(int op1, int op2, Register dst, int imm8);
-
-  // Emit a basic arithmetic instruction (i.e. first byte of the family is 0x81)
-  // with a given destination expression and an immediate operand.  It attempts
-  // to use the shortest encoding possible.
-  // sel specifies the /n in the modrm byte (see the Intel PRM).
-  void emit_arith(int sel, Operand dst, const Immediate& x);
-
-  void emit_operand(Register reg, const Operand& adr);
-
-  void emit_farith(int b1, int b2, int i);
-
-  // labels
-  void print(Label* L);
-  void bind_to(Label* L, int pos);
-  void link_to(Label* L, Label* appendix);
-
-  // displacements
-  inline Displacement disp_at(Label* L);
-  inline void disp_at_put(Label* L, Displacement disp);
-  inline void emit_disp(Label* L, Displacement::Type type);
-
-  // record reloc info for current pc_
-  void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
-
-  friend class CodePatcher;
-  friend class EnsureSpace;
-
-  // Code buffer:
-  // The buffer into which code and relocation info are generated.
-  byte* buffer_;
-  int buffer_size_;
-  // True if the assembler owns the buffer, false if buffer is external.
-  bool own_buffer_;
-
-  // code generation
-  byte* pc_;  // the program counter; moves forward
-  RelocInfoWriter reloc_info_writer;
-
-  // push-pop elimination
-  byte* last_pc_;
-
-  // source position information
-  int current_statement_position_;
-  int current_position_;
-  int written_statement_position_;
-  int written_position_;
-};
-
-
-// Helper class that ensures that there is enough space for generating
-// instructions and relocation information.  The constructor makes
-// sure that there is enough space and (in debug mode) the destructor
-// checks that we did not generate too much.
-class EnsureSpace BASE_EMBEDDED {
- public:
-  explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) {
-    if (assembler_->overflow()) assembler_->GrowBuffer();
-#ifdef DEBUG
-    space_before_ = assembler_->available_space();
-#endif
-  }
-
-#ifdef DEBUG
-  ~EnsureSpace() {
-    int bytes_generated = space_before_ - assembler_->available_space();
-    ASSERT(bytes_generated < assembler_->kGap);
-  }
-#endif
-
- private:
-  Assembler* assembler_;
-#ifdef DEBUG
-  int space_before_;
-#endif
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_ASSEMBLER_IA32_H_