Move backend specific files to separate directories.

src/assembler-arm.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 ARM Assembler
-// Generates user mode instructions for the ARM architecture up to version 5
-
-#ifndef V8_ASSEMBLER_ARM_H_
-#define V8_ASSEMBLER_ARM_H_
-
-#include "assembler.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.
-//
-// Core register
-struct Register {
-  bool is_valid() const  { return 0 <= code_ && code_ < 16; }
-  bool is(Register reg) const  { return code_ == reg.code_; }
-  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 = 16;
-
-extern Register no_reg;
-extern Register r0;
-extern Register r1;
-extern Register r2;
-extern Register r3;
-extern Register r4;
-extern Register r5;
-extern Register r6;
-extern Register r7;
-extern Register r8;
-extern Register r9;
-extern Register r10;
-extern Register fp;
-extern Register ip;
-extern Register sp;
-extern Register lr;
-extern Register pc;
-
-
-// Coprocessor register
-struct CRegister {
-  bool is_valid() const  { return 0 <= code_ && code_ < 16; }
-  bool is(CRegister creg) const  { return code_ == creg.code_; }
-  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_;
-};
-
-
-extern CRegister no_creg;
-extern CRegister cr0;
-extern CRegister cr1;
-extern CRegister cr2;
-extern CRegister cr3;
-extern CRegister cr4;
-extern CRegister cr5;
-extern CRegister cr6;
-extern CRegister cr7;
-extern CRegister cr8;
-extern CRegister cr9;
-extern CRegister cr10;
-extern CRegister cr11;
-extern CRegister cr12;
-extern CRegister cr13;
-extern CRegister cr14;
-extern CRegister cr15;
-
-
-// Coprocessor number
-enum Coprocessor {
-  p0  = 0,
-  p1  = 1,
-  p2  = 2,
-  p3  = 3,
-  p4  = 4,
-  p5  = 5,
-  p6  = 6,
-  p7  = 7,
-  p8  = 8,
-  p9  = 9,
-  p10 = 10,
-  p11 = 11,
-  p12 = 12,
-  p13 = 13,
-  p14 = 14,
-  p15 = 15
-};
-
-
-// Condition field in instructions
-enum Condition {
-  eq =  0 << 28,
-  ne =  1 << 28,
-  cs =  2 << 28,
-  hs =  2 << 28,
-  cc =  3 << 28,
-  lo =  3 << 28,
-  mi =  4 << 28,
-  pl =  5 << 28,
-  vs =  6 << 28,
-  vc =  7 << 28,
-  hi =  8 << 28,
-  ls =  9 << 28,
-  ge = 10 << 28,
-  lt = 11 << 28,
-  gt = 12 << 28,
-  le = 13 << 28,
-  al = 14 << 28
-};
-
-
-// Returns the equivalent of !cc.
-INLINE(Condition NegateCondition(Condition cc));
-
-
-// Corresponds to transposing the operands of a comparison.
-inline Condition ReverseCondition(Condition cc) {
-  switch (cc) {
-    case lo:
-      return hi;
-    case hi:
-      return lo;
-    case hs:
-      return ls;
-    case ls:
-      return hs;
-    case lt:
-      return gt;
-    case gt:
-      return lt;
-    case ge:
-      return le;
-    case le:
-      return ge;
-    default:
-      return cc;
-  };
-}
-
-
-// Branch hints are not used on the ARM.  They are defined so that they can
-// appear in shared function signatures, but will be ignored in ARM
-// implementations.
-enum Hint { no_hint };
-
-// Hints are not used on the arm.  Negating is trivial.
-inline Hint NegateHint(Hint ignored) { return no_hint; }
-
-
-// -----------------------------------------------------------------------------
-// Addressing modes and instruction variants
-
-// Shifter operand shift operation
-enum ShiftOp {
-  LSL = 0 << 5,
-  LSR = 1 << 5,
-  ASR = 2 << 5,
-  ROR = 3 << 5,
-  RRX = -1
-};
-
-
-// Condition code updating mode
-enum SBit {
-  SetCC   = 1 << 20,  // set condition code
-  LeaveCC = 0 << 20   // leave condition code unchanged
-};
-
-
-// Status register selection
-enum SRegister {
-  CPSR = 0 << 22,
-  SPSR = 1 << 22
-};
-
-
-// Status register fields
-enum SRegisterField {
-  CPSR_c = CPSR | 1 << 16,
-  CPSR_x = CPSR | 1 << 17,
-  CPSR_s = CPSR | 1 << 18,
-  CPSR_f = CPSR | 1 << 19,
-  SPSR_c = SPSR | 1 << 16,
-  SPSR_x = SPSR | 1 << 17,
-  SPSR_s = SPSR | 1 << 18,
-  SPSR_f = SPSR | 1 << 19
-};
-
-// Status register field mask (or'ed SRegisterField enum values)
-typedef uint32_t SRegisterFieldMask;
-
-
-// Memory operand addressing mode
-enum AddrMode {
-  // bit encoding P U W
-  Offset       = (8|4|0) << 21,  // offset (without writeback to base)
-  PreIndex     = (8|4|1) << 21,  // pre-indexed addressing with writeback
-  PostIndex    = (0|4|0) << 21,  // post-indexed addressing with writeback
-  NegOffset    = (8|0|0) << 21,  // negative offset (without writeback to base)
-  NegPreIndex  = (8|0|1) << 21,  // negative pre-indexed with writeback
-  NegPostIndex = (0|0|0) << 21   // negative post-indexed with writeback
-};
-
-
-// Load/store multiple addressing mode
-enum BlockAddrMode {
-  // bit encoding P U W
-  da           = (0|0|0) << 21,  // decrement after
-  ia           = (0|4|0) << 21,  // increment after
-  db           = (8|0|0) << 21,  // decrement before
-  ib           = (8|4|0) << 21,  // increment before
-  da_w         = (0|0|1) << 21,  // decrement after with writeback to base
-  ia_w         = (0|4|1) << 21,  // increment after with writeback to base
-  db_w         = (8|0|1) << 21,  // decrement before with writeback to base
-  ib_w         = (8|4|1) << 21   // increment before with writeback to base
-};
-
-
-// Coprocessor load/store operand size
-enum LFlag {
-  Long  = 1 << 22,  // long load/store coprocessor
-  Short = 0 << 22   // short load/store coprocessor
-};
-
-
-// -----------------------------------------------------------------------------
-// Machine instruction Operands
-
-// Class Operand represents a shifter operand in data processing instructions
-class Operand BASE_EMBEDDED {
- public:
-  // immediate
-  INLINE(explicit Operand(int32_t immediate,
-         RelocInfo::Mode rmode = RelocInfo::NONE));
-  INLINE(explicit Operand(const ExternalReference& f));
-  INLINE(explicit Operand(const char* s));
-  INLINE(explicit Operand(Object** opp));
-  INLINE(explicit Operand(Context** cpp));
-  explicit Operand(Handle<Object> handle);
-  INLINE(explicit Operand(Smi* value));
-
-  // rm
-  INLINE(explicit Operand(Register rm));
-
-  // rm <shift_op> shift_imm
-  explicit Operand(Register rm, ShiftOp shift_op, int shift_imm);
-
-  // rm <shift_op> rs
-  explicit Operand(Register rm, ShiftOp shift_op, Register rs);
-
-  // Return true if this is a register operand.
-  INLINE(bool is_reg() const);
-
-  Register rm() const { return rm_; }
-
- private:
-  Register rm_;
-  Register rs_;
-  ShiftOp shift_op_;
-  int shift_imm_;  // valid if rm_ != no_reg && rs_ == no_reg
-  int32_t imm32_;  // valid if rm_ == no_reg
-  RelocInfo::Mode rmode_;
-
-  friend class Assembler;
-};
-
-
-// Class MemOperand represents a memory operand in load and store instructions
-class MemOperand BASE_EMBEDDED {
- public:
-  // [rn +/- offset]      Offset/NegOffset
-  // [rn +/- offset]!     PreIndex/NegPreIndex
-  // [rn], +/- offset     PostIndex/NegPostIndex
-  // offset is any signed 32-bit value; offset is first loaded to register ip if
-  // it does not fit the addressing mode (12-bit unsigned and sign bit)
-  explicit MemOperand(Register rn, int32_t offset = 0, AddrMode am = Offset);
-
-  // [rn +/- rm]          Offset/NegOffset
-  // [rn +/- rm]!         PreIndex/NegPreIndex
-  // [rn], +/- rm         PostIndex/NegPostIndex
-  explicit MemOperand(Register rn, Register rm, AddrMode am = Offset);
-
-  // [rn +/- rm <shift_op> shift_imm]      Offset/NegOffset
-  // [rn +/- rm <shift_op> shift_imm]!     PreIndex/NegPreIndex
-  // [rn], +/- rm <shift_op> shift_imm     PostIndex/NegPostIndex
-  explicit MemOperand(Register rn, Register rm,
-                      ShiftOp shift_op, int shift_imm, AddrMode am = Offset);
-
- private:
-  Register rn_;  // base
-  Register rm_;  // register offset
-  int32_t offset_;  // valid if rm_ == no_reg
-  ShiftOp shift_op_;
-  int shift_imm_;  // valid if rm_ != no_reg && rs_ == no_reg
-  AddrMode am_;  // bits P, U, and W
-
-  friend class Assembler;
-};
-
-
-typedef int32_t Instr;
-
-
-class Assembler : public Malloced {
- 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);
-
-  // 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
-
-  // Returns the branch offset to the given label from the current code position
-  // Links the label to the current position if it is still unbound
-  // Manages the jump elimination optimization if the second parameter is true.
-  int branch_offset(Label* L, bool jump_elimination_allowed);
-
-  // Return the address in the constant pool of the code target address used by
-  // the branch/call instruction at pc.
-  INLINE(static Address target_address_address_at(Address pc));
-
-  // Read/Modify the code target address 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 instruction referring to the address of the call
-  // target (ldr pc, [target addr in const pool]) and the return address
-  static const int kTargetAddrToReturnAddrDist = sizeof(Instr);
-
-
-  // ---------------------------------------------------------------------------
-  // Code generation
-
-  // 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 (>= 4).
-  void Align(int m);
-
-  // Branch instructions
-  void b(int branch_offset, Condition cond = al);
-  void bl(int branch_offset, Condition cond = al);
-  void blx(int branch_offset);  // v5 and above
-  void blx(Register target, Condition cond = al);  // v5 and above
-  void bx(Register target, Condition cond = al);  // v5 and above, plus v4t
-
-  // Convenience branch instructions using labels
-  void b(Label* L, Condition cond = al)  {
-    b(branch_offset(L, cond == al), cond);
-  }
-  void b(Condition cond, Label* L)  { b(branch_offset(L, cond == al), cond); }
-  void bl(Label* L, Condition cond = al)  { bl(branch_offset(L, false), cond); }
-  void bl(Condition cond, Label* L)  { bl(branch_offset(L, false), cond); }
-  void blx(Label* L)  { blx(branch_offset(L, false)); }  // v5 and above
-
-  // Data-processing instructions
-  void and_(Register dst, Register src1, const Operand& src2,
-            SBit s = LeaveCC, Condition cond = al);
-
-  void eor(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void sub(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-  void sub(Register dst, Register src1, Register src2,
-           SBit s = LeaveCC, Condition cond = al) {
-    sub(dst, src1, Operand(src2), s, cond);
-  }
-
-  void rsb(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void add(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void adc(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void sbc(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void rsc(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void tst(Register src1, const Operand& src2, Condition cond = al);
-  void tst(Register src1, Register src2, Condition cond = al) {
-    tst(src1, Operand(src2), cond);
-  }
-
-  void teq(Register src1, const Operand& src2, Condition cond = al);
-
-  void cmp(Register src1, const Operand& src2, Condition cond = al);
-  void cmp(Register src1, Register src2, Condition cond = al) {
-    cmp(src1, Operand(src2), cond);
-  }
-
-  void cmn(Register src1, const Operand& src2, Condition cond = al);
-
-  void orr(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-  void orr(Register dst, Register src1, Register src2,
-           SBit s = LeaveCC, Condition cond = al) {
-    orr(dst, src1, Operand(src2), s, cond);
-  }
-
-  void mov(Register dst, const Operand& src,
-           SBit s = LeaveCC, Condition cond = al);
-  void mov(Register dst, Register src, SBit s = LeaveCC, Condition cond = al) {
-    mov(dst, Operand(src), s, cond);
-  }
-
-  void bic(Register dst, Register src1, const Operand& src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void mvn(Register dst, const Operand& src,
-           SBit s = LeaveCC, Condition cond = al);
-
-  // Multiply instructions
-
-  void mla(Register dst, Register src1, Register src2, Register srcA,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void mul(Register dst, Register src1, Register src2,
-           SBit s = LeaveCC, Condition cond = al);
-
-  void smlal(Register dstL, Register dstH, Register src1, Register src2,
-             SBit s = LeaveCC, Condition cond = al);
-
-  void smull(Register dstL, Register dstH, Register src1, Register src2,
-             SBit s = LeaveCC, Condition cond = al);
-
-  void umlal(Register dstL, Register dstH, Register src1, Register src2,
-             SBit s = LeaveCC, Condition cond = al);
-
-  void umull(Register dstL, Register dstH, Register src1, Register src2,
-             SBit s = LeaveCC, Condition cond = al);
-
-  // Miscellaneous arithmetic instructions
-
-  void clz(Register dst, Register src, Condition cond = al);  // v5 and above
-
-  // Status register access instructions
-
-  void mrs(Register dst, SRegister s, Condition cond = al);
-  void msr(SRegisterFieldMask fields, const Operand& src, Condition cond = al);
-
-  // Load/Store instructions
-  void ldr(Register dst, const MemOperand& src, Condition cond = al);
-  void str(Register src, const MemOperand& dst, Condition cond = al);
-  void ldrb(Register dst, const MemOperand& src, Condition cond = al);
-  void strb(Register src, const MemOperand& dst, Condition cond = al);
-  void ldrh(Register dst, const MemOperand& src, Condition cond = al);
-  void strh(Register src, const MemOperand& dst, Condition cond = al);
-  void ldrsb(Register dst, const MemOperand& src, Condition cond = al);
-  void ldrsh(Register dst, const MemOperand& src, Condition cond = al);
-
-  // Load/Store multiple instructions
-  void ldm(BlockAddrMode am, Register base, RegList dst, Condition cond = al);
-  void stm(BlockAddrMode am, Register base, RegList src, Condition cond = al);
-
-  // Semaphore instructions
-  void swp(Register dst, Register src, Register base, Condition cond = al);
-  void swpb(Register dst, Register src, Register base, Condition cond = al);
-
-  // Exception-generating instructions and debugging support
-  void stop(const char* msg);
-
-  void bkpt(uint32_t imm16);  // v5 and above
-  void swi(uint32_t imm24, Condition cond = al);
-
-  // Coprocessor instructions
-
-  void cdp(Coprocessor coproc, int opcode_1,
-           CRegister crd, CRegister crn, CRegister crm,
-           int opcode_2, Condition cond = al);
-
-  void cdp2(Coprocessor coproc, int opcode_1,
-            CRegister crd, CRegister crn, CRegister crm,
-            int opcode_2);  // v5 and above
-
-  void mcr(Coprocessor coproc, int opcode_1,
-           Register rd, CRegister crn, CRegister crm,
-           int opcode_2 = 0, Condition cond = al);
-
-  void mcr2(Coprocessor coproc, int opcode_1,
-            Register rd, CRegister crn, CRegister crm,
-            int opcode_2 = 0);  // v5 and above
-
-  void mrc(Coprocessor coproc, int opcode_1,
-           Register rd, CRegister crn, CRegister crm,
-           int opcode_2 = 0, Condition cond = al);
-
-  void mrc2(Coprocessor coproc, int opcode_1,
-            Register rd, CRegister crn, CRegister crm,
-            int opcode_2 = 0);  // v5 and above
-
-  void ldc(Coprocessor coproc, CRegister crd, const MemOperand& src,
-           LFlag l = Short, Condition cond = al);
-  void ldc(Coprocessor coproc, CRegister crd, Register base, int option,
-           LFlag l = Short, Condition cond = al);
-
-  void ldc2(Coprocessor coproc, CRegister crd, const MemOperand& src,
-            LFlag l = Short);  // v5 and above
-  void ldc2(Coprocessor coproc, CRegister crd, Register base, int option,
-            LFlag l = Short);  // v5 and above
-
-  void stc(Coprocessor coproc, CRegister crd, const MemOperand& dst,
-           LFlag l = Short, Condition cond = al);
-  void stc(Coprocessor coproc, CRegister crd, Register base, int option,
-           LFlag l = Short, Condition cond = al);
-
-  void stc2(Coprocessor coproc, CRegister crd, const MemOperand& dst,
-            LFlag l = Short);  // v5 and above
-  void stc2(Coprocessor coproc, CRegister crd, Register base, int option,
-            LFlag l = Short);  // v5 and above
-
-  // Pseudo instructions
-  void nop()  { mov(r0, Operand(r0)); }
-
-  void push(Register src) {
-    str(src, MemOperand(sp, 4, NegPreIndex), al);
-  }
-
-  void pop(Register dst) {
-    ldr(dst, MemOperand(sp, 4, PostIndex), al);
-  }
-
-  void pop() {
-    add(sp, sp, Operand(kPointerSize));
-  }
-
-  // Load effective address of memory operand x into register dst
-  void lea(Register dst, const MemOperand& x,
-           SBit s = LeaveCC, Condition cond = al);
-
-  // Jump unconditionally to given label.
-  void jmp(Label* L) { b(L, al); }
-
-
-  // Debugging
-
-  // 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();
-
-  int pc_offset() const { return pc_ - buffer_; }
-  int current_position() const { return current_position_; }
-  int current_statement_position() const { return current_position_; }
-
- protected:
-  int buffer_space() const { return reloc_info_writer.pos() - pc_; }
-
-  // Read/patch instructions
-  Instr instr_at(byte* pc) { return *reinterpret_cast<Instr*>(pc); }
-  void instr_at_put(byte* pc, Instr instr) {
-    *reinterpret_cast<Instr*>(pc) = instr;
-  }
-  Instr instr_at(int pos) { return *reinterpret_cast<Instr*>(buffer_ + pos); }
-  void instr_at_put(int pos, Instr instr) {
-    *reinterpret_cast<Instr*>(buffer_ + pos) = instr;
-  }
-
-  // Decode branch instruction at pos and return branch target pos
-  int target_at(int pos);
-
-  // Patch branch instruction at pos to branch to given branch target pos
-  void target_at_put(int pos, int target_pos);
-
-  // Check if is time to emit a constant pool for pending reloc info entries
-  void CheckConstPool(bool force_emit, bool require_jump);
-
-  // Block the emission of the constant pool before pc_offset
-  void BlockConstPoolBefore(int pc_offset) {
-    if (no_const_pool_before_ < pc_offset) no_const_pool_before_ = pc_offset;
-  }
-
- private:
-  // 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_;
-
-  // Buffer size and constant pool distance are checked together at regular
-  // intervals of kBufferCheckInterval emitted bytes
-  static const int kBufferCheckInterval = 1*KB/2;
-  int next_buffer_check_;  // pc offset of next buffer check
-
-  // Code generation
-  static const int kInstrSize = sizeof(Instr);  // signed size
-  // The relocation writer's position is at least kGap bytes below the end of
-  // the generated instructions. This is so that multi-instruction sequences do
-  // not have to check for overflow. The same is true for writes of large
-  // relocation info entries.
-  static const int kGap = 32;
-  byte* pc_;  // the program counter; moves forward
-
-  // Constant pool generation
-  // Pools are emitted in the instruction stream, preferably after unconditional
-  // jumps or after returns from functions (in dead code locations).
-  // If a long code sequence does not contain unconditional jumps, it is
-  // necessary to emit the constant pool before the pool gets too far from the
-  // location it is accessed from. In this case, we emit a jump over the emitted
-  // constant pool.
-  // Constants in the pool may be addresses of functions that gets relocated;
-  // if so, a relocation info entry is associated to the constant pool entry.
-
-  // Repeated checking whether the constant pool should be emitted is rather
-  // expensive. By default we only check again once a number of instructions
-  // has been generated. That also means that the sizing of the buffers is not
-  // an exact science, and that we rely on some slop to not overrun buffers.
-  static const int kCheckConstIntervalInst = 32;
-  static const int kCheckConstInterval = kCheckConstIntervalInst * kInstrSize;
-
-
-  // Pools are emitted after function return and in dead code at (more or less)
-  // regular intervals of kDistBetweenPools bytes
-  static const int kDistBetweenPools = 1*KB;
-
-  // Constants in pools are accessed via pc relative addressing, which can
-  // reach +/-4KB thereby defining a maximum distance between the instruction
-  // and the accessed constant. We satisfy this constraint by limiting the
-  // distance between pools.
-  static const int kMaxDistBetweenPools = 4*KB - 2*kBufferCheckInterval;
-
-  // Emission of the constant pool may be blocked in some code sequences
-  int no_const_pool_before_;  // block emission before this pc offset
-
-  // Keep track of the last emitted pool to guarantee a maximal distance
-  int last_const_pool_end_;  // pc offset following the last constant pool
-
-  // Relocation info generation
-  // Each relocation is encoded as a variable size value
-  static const int kMaxRelocSize = RelocInfoWriter::kMaxSize;
-  RelocInfoWriter reloc_info_writer;
-  // Relocation info records are also used during code generation as temporary
-  // containers for constants and code target addresses until they are emitted
-  // to the constant pool. These pending relocation info records are temporarily
-  // stored in a separate buffer until a constant pool is emitted.
-  // If every instruction in a long sequence is accessing the pool, we need one
-  // pending relocation entry per instruction.
-  static const int kMaxNumPRInfo = kMaxDistBetweenPools/kInstrSize;
-  RelocInfo prinfo_[kMaxNumPRInfo];  // the buffer of pending relocation info
-  int num_prinfo_;  // number of pending reloc info entries in the buffer
-
-  // The bound position, before this we cannot do instruction elimination.
-  int last_bound_pos_;
-
-  // source position information
-  int current_position_;
-  int current_statement_position_;
-  int written_position_;
-  int written_statement_position_;
-
-  // Code emission
-  inline void CheckBuffer();
-  void GrowBuffer();
-  inline void emit(Instr x);
-
-  // Instruction generation
-  void addrmod1(Instr instr, Register rn, Register rd, const Operand& x);
-  void addrmod2(Instr instr, Register rd, const MemOperand& x);
-  void addrmod3(Instr instr, Register rd, const MemOperand& x);
-  void addrmod4(Instr instr, Register rn, RegList rl);
-  void addrmod5(Instr instr, CRegister crd, const MemOperand& x);
-
-  // Labels
-  void print(Label* L);
-  void bind_to(Label* L, int pos);
-  void link_to(Label* L, Label* appendix);
-  void next(Label* L);
-
-  // Record reloc info for current pc_
-  void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_ASSEMBLER_ARM_H_