[Isolates] Merge r 6300:6500 from bleeding_edge to isolates.

src/arm/assembler-arm.cc

 // 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.
 //
@@ skipping 195 matching lines @@
   ASSERT(is_uint5(shift_imm));
   rn_ = rn;
   rm_ = rm;
   shift_op_ = shift_op;
   shift_imm_ = shift_imm & 31;
   am_ = am;
 }
 
 
 // -----------------------------------------------------------------------------
-// Implementation of Assembler.
-
-// Instruction encoding bits.
-enum {
-  H   = 1 << 5,   // halfword (or byte)
-  S6  = 1 << 6,   // signed (or unsigned)
-  L   = 1 << 20,  // load (or store)
-  S   = 1 << 20,  // set condition code (or leave unchanged)
-  W   = 1 << 21,  // writeback base register (or leave unchanged)
-  A   = 1 << 21,  // accumulate in multiply instruction (or not)
-  B   = 1 << 22,  // unsigned byte (or word)
-  N   = 1 << 22,  // long (or short)
-  U   = 1 << 23,  // positive (or negative) offset/index
-  P   = 1 << 24,  // offset/pre-indexed addressing (or post-indexed addressing)
-  I   = 1 << 25,  // immediate shifter operand (or not)
-
-  B4  = 1 << 4,
-  B5  = 1 << 5,
-  B6  = 1 << 6,
-  B7  = 1 << 7,
-  B8  = 1 << 8,
-  B9  = 1 << 9,
-  B12 = 1 << 12,
-  B16 = 1 << 16,
-  B18 = 1 << 18,
-  B19 = 1 << 19,
-  B20 = 1 << 20,
-  B21 = 1 << 21,
-  B22 = 1 << 22,
-  B23 = 1 << 23,
-  B24 = 1 << 24,
-  B25 = 1 << 25,
-  B26 = 1 << 26,
-  B27 = 1 << 27,
-
-  // Instruction bit masks.
-  RdMask     = 15 << 12,  // in str instruction
-  CondMask   = 15 << 28,
-  CoprocessorMask = 15 << 8,
-  OpCodeMask = 15 << 21,  // in data-processing instructions
-  Imm24Mask  = (1 << 24) - 1,
-  Off12Mask  = (1 << 12) - 1,
-  // Reserved condition.
-  nv = 15 << 28
-};
-
+// Specific instructions, constants, and masks.
 
 // add(sp, sp, 4) instruction (aka Pop())
-static const Instr kPopInstruction =
-    al | 4 * B21 | 4 | LeaveCC | I | sp.code() * B16 | sp.code() * B12;
+const Instr kPopInstruction =
+    al | PostIndex | 4 | LeaveCC | I | sp.code() * B16 | sp.code() * B12;
 // str(r, MemOperand(sp, 4, NegPreIndex), al) instruction (aka push(r))
 // register r is not encoded.
-static const Instr kPushRegPattern =
+const Instr kPushRegPattern =
     al | B26 | 4 | NegPreIndex | sp.code() * B16;
 // ldr(r, MemOperand(sp, 4, PostIndex), al) instruction (aka pop(r))
 // register r is not encoded.
-static const Instr kPopRegPattern =
+const Instr kPopRegPattern =
     al | B26 | L | 4 | PostIndex | sp.code() * B16;
 // mov lr, pc
-const Instr kMovLrPc = al | 13*B21 | pc.code() | lr.code() * B12;
+const Instr kMovLrPc = al | MOV | pc.code() | lr.code() * B12;
 // ldr rd, [pc, #offset]
-const Instr kLdrPCMask = CondMask | 15 * B24 | 7 * B20 | 15 * B16;
+const Instr kLdrPCMask = kCondMask | 15 * B24 | 7 * B20 | 15 * B16;
 const Instr kLdrPCPattern = al | 5 * B24 | L | pc.code() * B16;
 // blxcc rm
 const Instr kBlxRegMask =
     15 * B24 | 15 * B20 | 15 * B16 | 15 * B12 | 15 * B8 | 15 * B4;
 const Instr kBlxRegPattern =
-    B24 | B21 | 15 * B16 | 15 * B12 | 15 * B8 | 3 * B4;
+    B24 | B21 | 15 * B16 | 15 * B12 | 15 * B8 | BLX;
 const Instr kMovMvnMask = 0x6d * B21 | 0xf * B16;
 const Instr kMovMvnPattern = 0xd * B21;
 const Instr kMovMvnFlip = B22;
 const Instr kMovLeaveCCMask = 0xdff * B16;
 const Instr kMovLeaveCCPattern = 0x1a0 * B16;
 const Instr kMovwMask = 0xff * B20;
 const Instr kMovwPattern = 0x30 * B20;
 const Instr kMovwLeaveCCFlip = 0x5 * B21;
 const Instr kCmpCmnMask = 0xdd * B20 | 0xf * B12;
 const Instr kCmpCmnPattern = 0x15 * B20;
 const Instr kCmpCmnFlip = B21;
-const Instr kALUMask = 0x6f * B21;
-const Instr kAddPattern = 0x4 * B21;
-const Instr kSubPattern = 0x2 * B21;
-const Instr kBicPattern = 0xe * B21;
-const Instr kAndPattern = 0x0 * B21;
 const Instr kAddSubFlip = 0x6 * B21;
 const Instr kAndBicFlip = 0xe * B21;
 
 // A mask for the Rd register for push, pop, ldr, str instructions.
-const Instr kRdMask = 0x0000f000;
-static const int kRdShift = 12;
-static const Instr kLdrRegFpOffsetPattern =
+const Instr kLdrRegFpOffsetPattern =
     al | B26 | L | Offset | fp.code() * B16;
-static const Instr kStrRegFpOffsetPattern =
+const Instr kStrRegFpOffsetPattern =
     al | B26 | Offset | fp.code() * B16;
-static const Instr kLdrRegFpNegOffsetPattern =
+const Instr kLdrRegFpNegOffsetPattern =
     al | B26 | L | NegOffset | fp.code() * B16;
-static const Instr kStrRegFpNegOffsetPattern =
+const Instr kStrRegFpNegOffsetPattern =
     al | B26 | NegOffset | fp.code() * B16;
-static const Instr kLdrStrInstrTypeMask = 0xffff0000;
-static const Instr kLdrStrInstrArgumentMask = 0x0000ffff;
-static const Instr kLdrStrOffsetMask = 0x00000fff;
+const Instr kLdrStrInstrTypeMask = 0xffff0000;
+const Instr kLdrStrInstrArgumentMask = 0x0000ffff;
+const Instr kLdrStrOffsetMask = 0x00000fff;
 
+
+// Spare buffer.
 static const int kMinimalBufferSize = 4*KB;
 
+
 Assembler::Assembler(void* buffer, int buffer_size)
     : positions_recorder_(this),
       allow_peephole_optimization_(false) {
   Isolate* isolate = Isolate::Current();
   // BUG(3245989): disable peephole optimization if crankshaft is enabled.
   allow_peephole_optimization_ = FLAG_peephole_optimization;
   if (buffer == NULL) {
     // Do our own buffer management.
     if (buffer_size <= kMinimalBufferSize) {
       buffer_size = kMinimalBufferSize;
@@ skipping 75 matching lines @@
 
 bool Assembler::IsBranch(Instr instr) {
   return (instr & (B27 | B25)) == (B27 | B25);
 }
 
 
 int Assembler::GetBranchOffset(Instr instr) {
   ASSERT(IsBranch(instr));
   // Take the jump offset in the lower 24 bits, sign extend it and multiply it
   // with 4 to get the offset in bytes.
-  return ((instr & Imm24Mask) << 8) >> 6;
+  return ((instr & kImm24Mask) << 8) >> 6;
 }
 
 
 bool Assembler::IsLdrRegisterImmediate(Instr instr) {
   return (instr & (B27 | B26 | B25 | B22 | B20)) == (B26 | B20);
 }
 
 
 int Assembler::GetLdrRegisterImmediateOffset(Instr instr) {
   ASSERT(IsLdrRegisterImmediate(instr));
   bool positive = (instr & B23) == B23;
-  int offset = instr & Off12Mask;  // Zero extended offset.
+  int offset = instr & kOff12Mask;  // Zero extended offset.
   return positive ? offset : -offset;
 }
 
 
 Instr Assembler::SetLdrRegisterImmediateOffset(Instr instr, int offset) {
   ASSERT(IsLdrRegisterImmediate(instr));
   bool positive = offset >= 0;
   if (!positive) offset = -offset;
   ASSERT(is_uint12(offset));
   // Set bit indicating whether the offset should be added.
   instr = (instr & ~B23) | (positive ? B23 : 0);
   // Set the actual offset.
-  return (instr & ~Off12Mask) | offset;
+  return (instr & ~kOff12Mask) | offset;
 }
 
 
 bool Assembler::IsStrRegisterImmediate(Instr instr) {
   return (instr & (B27 | B26 | B25 | B22 | B20)) == B26;
 }
 
 
 Instr Assembler::SetStrRegisterImmediateOffset(Instr instr, int offset) {
   ASSERT(IsStrRegisterImmediate(instr));
   bool positive = offset >= 0;
   if (!positive) offset = -offset;
   ASSERT(is_uint12(offset));
   // Set bit indicating whether the offset should be added.
   instr = (instr & ~B23) | (positive ? B23 : 0);
   // Set the actual offset.
-  return (instr & ~Off12Mask) | offset;
+  return (instr & ~kOff12Mask) | offset;
 }
 
 
 bool Assembler::IsAddRegisterImmediate(Instr instr) {
   return (instr & (B27 | B26 | B25 | B24 | B23 | B22 | B21)) == (B25 | B23);
 }
 
 
 Instr Assembler::SetAddRegisterImmediateOffset(Instr instr, int offset) {
   ASSERT(IsAddRegisterImmediate(instr));
   ASSERT(offset >= 0);
   ASSERT(is_uint12(offset));
   // Set the offset.
-  return (instr & ~Off12Mask) | offset;
+  return (instr & ~kOff12Mask) | offset;
 }
 
 
 Register Assembler::GetRd(Instr instr) {
   Register reg;
-  reg.code_ = ((instr & kRdMask) >> kRdShift);
+  reg.code_ = Instruction::RdValue(instr);
   return reg;
 }
 
 
 bool Assembler::IsPush(Instr instr) {
   return ((instr & ~kRdMask) == kPushRegPattern);
 }
 
 
 bool Assembler::IsPop(Instr instr) {
@@ skipping 17 matching lines @@
 
 
 bool Assembler::IsLdrRegFpNegOffset(Instr instr) {
   return ((instr & kLdrStrInstrTypeMask) == kLdrRegFpNegOffsetPattern);
 }
 
 
 bool Assembler::IsLdrPcImmediateOffset(Instr instr) {
   // Check the instruction is indeed a
   // ldr<cond> <Rd>, [pc +/- offset_12].
-  return (instr & 0x0f7f0000) == 0x051f0000;
+  return (instr & (kLdrPCMask & ~kCondMask)) == 0x051f0000;
 }
 
 
 // Labels refer to positions in the (to be) generated code.
 // There are bound, linked, and unused labels.
 //
 // Bound labels refer to known positions in the already
 // generated code. pos() is the position the label refers to.
 //
 // Linked labels refer to unknown positions in the code
 // to be generated; pos() is the position of the last
 // instruction using the label.
 
 
 // The link chain is terminated by a negative code position (must be aligned)
 const int kEndOfChain = -4;
 
 
 int Assembler::target_at(int pos)  {
   Instr instr = instr_at(pos);
-  if ((instr & ~Imm24Mask) == 0) {
+  if ((instr & ~kImm24Mask) == 0) {
     // Emitted label constant, not part of a branch.
     return instr - (Code::kHeaderSize - kHeapObjectTag);
   }
   ASSERT((instr & 7*B25) == 5*B25);  // b, bl, or blx imm24
-  int imm26 = ((instr & Imm24Mask) << 8) >> 6;
-  if ((instr & CondMask) == nv && (instr & B24) != 0) {
+  int imm26 = ((instr & kImm24Mask) << 8) >> 6;
+  if ((Instruction::ConditionField(instr) == kSpecialCondition) &&
+      ((instr & B24) != 0)) {
     // blx uses bit 24 to encode bit 2 of imm26
     imm26 += 2;
   }
   return pos + kPcLoadDelta + imm26;
 }
 
 
 void Assembler::target_at_put(int pos, int target_pos) {
   Instr instr = instr_at(pos);
-  if ((instr & ~Imm24Mask) == 0) {
+  if ((instr & ~kImm24Mask) == 0) {
     ASSERT(target_pos == kEndOfChain || target_pos >= 0);
     // Emitted label constant, not part of a branch.
     // Make label relative to Code* of generated Code object.
     instr_at_put(pos, target_pos + (Code::kHeaderSize - kHeapObjectTag));
     return;
   }
   int imm26 = target_pos - (pos + kPcLoadDelta);
   ASSERT((instr & 7*B25) == 5*B25);  // b, bl, or blx imm24
-  if ((instr & CondMask) == nv) {
+  if (Instruction::ConditionField(instr) == kSpecialCondition) {
     // blx uses bit 24 to encode bit 2 of imm26
     ASSERT((imm26 & 1) == 0);
-    instr = (instr & ~(B24 | Imm24Mask)) | ((imm26 & 2) >> 1)*B24;
+    instr = (instr & ~(B24 | kImm24Mask)) | ((imm26 & 2) >> 1)*B24;
   } else {
     ASSERT((imm26 & 3) == 0);
-    instr &= ~Imm24Mask;
+    instr &= ~kImm24Mask;
   }
   int imm24 = imm26 >> 2;
   ASSERT(is_int24(imm24));
-  instr_at_put(pos, instr | (imm24 & Imm24Mask));
+  instr_at_put(pos, instr | (imm24 & kImm24Mask));
 }
 
 
 void Assembler::print(Label* L) {
   if (L->is_unused()) {
     PrintF("unused label\n");
   } else if (L->is_bound()) {
     PrintF("bound label to %d\n", L->pos());
   } else if (L->is_linked()) {
     Label l = *L;
     PrintF("unbound label");
     while (l.is_linked()) {
       PrintF("@ %d ", l.pos());
       Instr instr = instr_at(l.pos());
-      if ((instr & ~Imm24Mask) == 0) {
+      if ((instr & ~kImm24Mask) == 0) {
         PrintF("value\n");
       } else {
         ASSERT((instr & 7*B25) == 5*B25);  // b, bl, or blx
-        int cond = instr & CondMask;
+        Condition cond = Instruction::ConditionField(instr);
         const char* b;
         const char* c;
-        if (cond == nv) {
+        if (cond == kSpecialCondition) {
           b = "blx";
           c = "";
         } else {
           if ((instr & B24) != 0)
             b = "bl";
           else
             b = "b";
 
           switch (cond) {
             case eq: c = "eq"; break;
@@ skipping 121 matching lines @@
           }
         }
       }
     } else if ((*instr & kCmpCmnMask) == kCmpCmnPattern) {
       if (fits_shifter(-imm32, rotate_imm, immed_8, NULL)) {
         *instr ^= kCmpCmnFlip;
         return true;
       }
     } else {
       Instr alu_insn = (*instr & kALUMask);
-      if (alu_insn == kAddPattern ||
-          alu_insn == kSubPattern) {
+      if (alu_insn == ADD ||
+          alu_insn == SUB) {
         if (fits_shifter(-imm32, rotate_imm, immed_8, NULL)) {
           *instr ^= kAddSubFlip;
           return true;
         }
-      } else if (alu_insn == kAndPattern ||
-                 alu_insn == kBicPattern) {
+      } else if (alu_insn == AND ||
+                 alu_insn == BIC) {
         if (fits_shifter(~imm32, rotate_imm, immed_8, NULL)) {
           *instr ^= kAndBicFlip;
           return true;
         }
       }
     }
   }
   return false;
 }
 
@@ skipping 23 matching lines @@
   uint32_t dummy1, dummy2;
   return fits_shifter(imm32_, &dummy1, &dummy2, NULL);
 }
 
 
 void Assembler::addrmod1(Instr instr,
                          Register rn,
                          Register rd,
                          const Operand& x) {
   CheckBuffer();
-  ASSERT((instr & ~(CondMask | OpCodeMask | S)) == 0);
+  ASSERT((instr & ~(kCondMask | kOpCodeMask | S)) == 0);
   if (!x.rm_.is_valid()) {
     // Immediate.
     uint32_t rotate_imm;
     uint32_t immed_8;
     if (x.must_use_constant_pool() ||
         !fits_shifter(x.imm32_, &rotate_imm, &immed_8, &instr)) {
       // The immediate operand cannot be encoded as a shifter operand, so load
       // it first to register ip and change the original instruction to use ip.
       // However, if the original instruction is a 'mov rd, x' (not setting the
       // condition code), then replace it with a 'ldr rd, [pc]'.
       CHECK(!rn.is(ip));  // rn should never be ip, or will be trashed
-      Condition cond = static_cast<Condition>(instr & CondMask);
-      if ((instr & ~CondMask) == 13*B21) {  // mov, S not set
+      Condition cond = Instruction::ConditionField(instr);
+      if ((instr & ~kCondMask) == 13*B21) {  // mov, S not set
         if (x.must_use_constant_pool() ||
             !Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
           RecordRelocInfo(x.rmode_, x.imm32_);
           ldr(rd, MemOperand(pc, 0), cond);
         } else {
           // Will probably use movw, will certainly not use constant pool.
           mov(rd, Operand(x.imm32_ & 0xffff), LeaveCC, cond);
           movt(rd, static_cast<uint32_t>(x.imm32_) >> 16, cond);
         }
       } else {
@@ skipping 21 matching lines @@
   }
   emit(instr | rn.code()*B16 | rd.code()*B12);
   if (rn.is(pc) || x.rm_.is(pc)) {
     // Block constant pool emission for one instruction after reading pc.
     BlockConstPoolBefore(pc_offset() + kInstrSize);
   }
 }
 
 
 void Assembler::addrmod2(Instr instr, Register rd, const MemOperand& x) {
-  ASSERT((instr & ~(CondMask | B | L)) == B26);
+  ASSERT((instr & ~(kCondMask | B | L)) == B26);
   int am = x.am_;
   if (!x.rm_.is_valid()) {
     // Immediate offset.
     int offset_12 = x.offset_;
     if (offset_12 < 0) {
       offset_12 = -offset_12;
       am ^= U;
     }
     if (!is_uint12(offset_12)) {
       // Immediate offset cannot be encoded, load it first to register ip
       // rn (and rd in a load) should never be ip, or will be trashed.
       ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip)));
-      mov(ip, Operand(x.offset_), LeaveCC,
-          static_cast<Condition>(instr & CondMask));
+      mov(ip, Operand(x.offset_), LeaveCC, Instruction::ConditionField(instr));
       addrmod2(instr, rd, MemOperand(x.rn_, ip, x.am_));
       return;
     }
     ASSERT(offset_12 >= 0);  // no masking needed
     instr |= offset_12;
   } else {
     // Register offset (shift_imm_ and shift_op_ are 0) or scaled
     // register offset the constructors make sure than both shift_imm_
     // and shift_op_ are initialized.
     ASSERT(!x.rm_.is(pc));
     instr |= B25 | x.shift_imm_*B7 | x.shift_op_ | x.rm_.code();
   }
   ASSERT((am & (P|W)) == P || !x.rn_.is(pc));  // no pc base with writeback
   emit(instr | am | x.rn_.code()*B16 | rd.code()*B12);
 }
 
 
 void Assembler::addrmod3(Instr instr, Register rd, const MemOperand& x) {
-  ASSERT((instr & ~(CondMask | L | S6 | H)) == (B4 | B7));
+  ASSERT((instr & ~(kCondMask | L | S6 | H)) == (B4 | B7));
   ASSERT(x.rn_.is_valid());
   int am = x.am_;
   if (!x.rm_.is_valid()) {
     // Immediate offset.
     int offset_8 = x.offset_;
     if (offset_8 < 0) {
       offset_8 = -offset_8;
       am ^= U;
     }
     if (!is_uint8(offset_8)) {
       // Immediate offset cannot be encoded, load it first to register ip
       // rn (and rd in a load) should never be ip, or will be trashed.
       ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip)));
-      mov(ip, Operand(x.offset_), LeaveCC,
-          static_cast<Condition>(instr & CondMask));
+      mov(ip, Operand(x.offset_), LeaveCC, Instruction::ConditionField(instr));
       addrmod3(instr, rd, MemOperand(x.rn_, ip, x.am_));
       return;
     }
     ASSERT(offset_8 >= 0);  // no masking needed
     instr |= B | (offset_8 >> 4)*B8 | (offset_8 & 0xf);
   } else if (x.shift_imm_ != 0) {
     // Scaled register offset not supported, load index first
     // rn (and rd in a load) should never be ip, or will be trashed.
     ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip)));
     mov(ip, Operand(x.rm_, x.shift_op_, x.shift_imm_), LeaveCC,
-        static_cast<Condition>(instr & CondMask));
+        Instruction::ConditionField(instr));
     addrmod3(instr, rd, MemOperand(x.rn_, ip, x.am_));
     return;
   } else {
     // Register offset.
     ASSERT((am & (P|W)) == P || !x.rm_.is(pc));  // no pc index with writeback
     instr |= x.rm_.code();
   }
   ASSERT((am & (P|W)) == P || !x.rn_.is(pc));  // no pc base with writeback
   emit(instr | am | x.rn_.code()*B16 | rd.code()*B12);
 }
 
 
 void Assembler::addrmod4(Instr instr, Register rn, RegList rl) {
-  ASSERT((instr & ~(CondMask | P | U | W | L)) == B27);
+  ASSERT((instr & ~(kCondMask | P | U | W | L)) == B27);
   ASSERT(rl != 0);
   ASSERT(!rn.is(pc));
   emit(instr | rn.code()*B16 | rl);
 }
 
 
 void Assembler::addrmod5(Instr instr, CRegister crd, const MemOperand& x) {
   // Unindexed addressing is not encoded by this function.
   ASSERT_EQ((B27 | B26),
-            (instr & ~(CondMask | CoprocessorMask | P | U | N | W | L)));
+            (instr & ~(kCondMask | kCoprocessorMask | P | U | N | W | L)));
   ASSERT(x.rn_.is_valid() && !x.rm_.is_valid());
   int am = x.am_;
   int offset_8 = x.offset_;
   ASSERT((offset_8 & 3) == 0);  // offset must be an aligned word offset
   offset_8 >>= 2;
   if (offset_8 < 0) {
     offset_8 = -offset_8;
     am ^= U;
   }
   ASSERT(is_uint8(offset_8));  // unsigned word offset must fit in a byte
@@ skipping 42 matching lines @@
     instr_at_put(at_offset, target_pos + (Code::kHeaderSize - kHeapObjectTag));
   }
 }
 
 
 // Branch instructions.
 void Assembler::b(int branch_offset, Condition cond) {
   ASSERT((branch_offset & 3) == 0);
   int imm24 = branch_offset >> 2;
   ASSERT(is_int24(imm24));
-  emit(cond | B27 | B25 | (imm24 & Imm24Mask));
+  emit(cond | B27 | B25 | (imm24 & kImm24Mask));
 
   if (cond == al) {
     // Dead code is a good location to emit the constant pool.
     CheckConstPool(false, false);
   }
 }
 
 
 void Assembler::bl(int branch_offset, Condition cond) {
   positions_recorder()->WriteRecordedPositions();
   ASSERT((branch_offset & 3) == 0);
   int imm24 = branch_offset >> 2;
   ASSERT(is_int24(imm24));
-  emit(cond | B27 | B25 | B24 | (imm24 & Imm24Mask));
+  emit(cond | B27 | B25 | B24 | (imm24 & kImm24Mask));
 }
 
 
 void Assembler::blx(int branch_offset) {  // v5 and above
   positions_recorder()->WriteRecordedPositions();
   ASSERT((branch_offset & 1) == 0);
   int h = ((branch_offset & 2) >> 1)*B24;
   int imm24 = branch_offset >> 2;
   ASSERT(is_int24(imm24));
-  emit(nv | B27 | B25 | h | (imm24 & Imm24Mask));
+  emit(kSpecialCondition | B27 | B25 | h | (imm24 & kImm24Mask));
 }
 
 
 void Assembler::blx(Register target, Condition cond) {  // v5 and above
   positions_recorder()->WriteRecordedPositions();
   ASSERT(!target.is(pc));
-  emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | 3*B4 | target.code());
+  emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | BLX | target.code());
 }
 
 
 void Assembler::bx(Register target, Condition cond) {  // v5 and above, plus v4t
   positions_recorder()->WriteRecordedPositions();
   ASSERT(!target.is(pc));  // use of pc is actually allowed, but discouraged
-  emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | B4 | target.code());
+  emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | BX | target.code());
 }
 
 
 // Data-processing instructions.
 
 void Assembler::and_(Register dst, Register src1, const Operand& src2,
                      SBit s, Condition cond) {
-  addrmod1(cond | 0*B21 | s, src1, dst, src2);
+  addrmod1(cond | AND | s, src1, dst, src2);
 }
 
 
 void Assembler::eor(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 1*B21 | s, src1, dst, src2);
+  addrmod1(cond | EOR | s, src1, dst, src2);
 }
 
 
 void Assembler::sub(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 2*B21 | s, src1, dst, src2);
+  addrmod1(cond | SUB | s, src1, dst, src2);
 }
 
 
 void Assembler::rsb(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 3*B21 | s, src1, dst, src2);
+  addrmod1(cond | RSB | s, src1, dst, src2);
 }
 
 
 void Assembler::add(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 4*B21 | s, src1, dst, src2);
+  addrmod1(cond | ADD | s, src1, dst, src2);
 
   // Eliminate pattern: push(r), pop()
   //   str(src, MemOperand(sp, 4, NegPreIndex), al);
   //   add(sp, sp, Operand(kPointerSize));
   // Both instructions can be eliminated.
   if (can_peephole_optimize(2) &&
       // Pattern.
       instr_at(pc_ - 1 * kInstrSize) == kPopInstruction &&
-      (instr_at(pc_ - 2 * kInstrSize) & ~RdMask) == kPushRegPattern) {
+      (instr_at(pc_ - 2 * kInstrSize) & ~kRdMask) == kPushRegPattern) {
     pc_ -= 2 * kInstrSize;
     if (FLAG_print_peephole_optimization) {
       PrintF("%x push(reg)/pop() eliminated\n", pc_offset());
     }
   }
 }
 
 
 void Assembler::adc(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 5*B21 | s, src1, dst, src2);
+  addrmod1(cond | ADC | s, src1, dst, src2);
 }
 
 
 void Assembler::sbc(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 6*B21 | s, src1, dst, src2);
+  addrmod1(cond | SBC | s, src1, dst, src2);
 }
 
 
 void Assembler::rsc(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 7*B21 | s, src1, dst, src2);
+  addrmod1(cond | RSC | s, src1, dst, src2);
 }
 
 
 void Assembler::tst(Register src1, const Operand& src2, Condition cond) {
-  addrmod1(cond | 8*B21 | S, src1, r0, src2);
+  addrmod1(cond | TST | S, src1, r0, src2);
 }
 
 
 void Assembler::teq(Register src1, const Operand& src2, Condition cond) {
-  addrmod1(cond | 9*B21 | S, src1, r0, src2);
+  addrmod1(cond | TEQ | S, src1, r0, src2);
 }
 
 
 void Assembler::cmp(Register src1, const Operand& src2, Condition cond) {
-  addrmod1(cond | 10*B21 | S, src1, r0, src2);
+  addrmod1(cond | CMP | S, src1, r0, src2);
 }
 
 
 void Assembler::cmn(Register src1, const Operand& src2, Condition cond) {
-  addrmod1(cond | 11*B21 | S, src1, r0, src2);
+  addrmod1(cond | CMN | S, src1, r0, src2);
 }
 
 
 void Assembler::orr(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 12*B21 | s, src1, dst, src2);
+  addrmod1(cond | ORR | s, src1, dst, src2);
 }
 
 
 void Assembler::mov(Register dst, const Operand& src, SBit s, Condition cond) {
   if (dst.is(pc)) {
     positions_recorder()->WriteRecordedPositions();
   }
   // Don't allow nop instructions in the form mov rn, rn to be generated using
   // the mov instruction. They must be generated using nop(int/NopMarkerTypes)
   // or MarkCode(int/NopMarkerTypes) pseudo instructions.
   ASSERT(!(src.is_reg() && src.rm().is(dst) && s == LeaveCC && cond == al));
-  addrmod1(cond | 13*B21 | s, r0, dst, src);
+  addrmod1(cond | MOV | s, r0, dst, src);
 }
 
 
 void Assembler::movw(Register reg, uint32_t immediate, Condition cond) {
   ASSERT(immediate < 0x10000);
   mov(reg, Operand(immediate), LeaveCC, cond);
 }
 
 
 void Assembler::movt(Register reg, uint32_t immediate, Condition cond) {
   emit(cond | 0x34*B20 | reg.code()*B12 | EncodeMovwImmediate(immediate));
 }
 
 
 void Assembler::bic(Register dst, Register src1, const Operand& src2,
                     SBit s, Condition cond) {
-  addrmod1(cond | 14*B21 | s, src1, dst, src2);
+  addrmod1(cond | BIC | s, src1, dst, src2);
 }
 
 
 void Assembler::mvn(Register dst, const Operand& src, SBit s, Condition cond) {
-  addrmod1(cond | 15*B21 | s, r0, dst, src);
+  addrmod1(cond | MVN | s, r0, dst, src);
 }
 
 
 // Multiply instructions.
 void Assembler::mla(Register dst, Register src1, Register src2, Register srcA,
                     SBit s, Condition cond) {
   ASSERT(!dst.is(pc) && !src1.is(pc) && !src2.is(pc) && !srcA.is(pc));
   emit(cond | A | s | dst.code()*B16 | srcA.code()*B12 |
        src2.code()*B8 | B7 | B4 | src1.code());
 }
@@ skipping 57 matching lines @@
   emit(cond | B23 | s | dstH.code()*B16 | dstL.code()*B12 |
        src2.code()*B8 | B7 | B4 | src1.code());
 }
 
 
 // Miscellaneous arithmetic instructions.
 void Assembler::clz(Register dst, Register src, Condition cond) {
   // v5 and above.
   ASSERT(!dst.is(pc) && !src.is(pc));
   emit(cond | B24 | B22 | B21 | 15*B16 | dst.code()*B12 |
-       15*B8 | B4 | src.code());
+       15*B8 | CLZ | src.code());
 }
 
 
 // Saturating instructions.
 
 // Unsigned saturate.
 void Assembler::usat(Register dst,
                      int satpos,
                      const Operand& src,
                      Condition cond) {
@@ skipping 133 matching lines @@
   //   str(ry, MemOperand(sp, 4, NegPreIndex), al)
   //   ldr(rx, MemOperand(sp, 4, PostIndex), al)
   // Both instructions can be eliminated if ry = rx.
   // If ry != rx, a register copy from ry to rx is inserted
   // after eliminating the push and the pop instructions.
   if (can_peephole_optimize(2)) {
     Instr push_instr = instr_at(pc_ - 2 * kInstrSize);
     Instr pop_instr = instr_at(pc_ - 1 * kInstrSize);
 
     if (IsPush(push_instr) && IsPop(pop_instr)) {
-      if ((pop_instr & kRdMask) != (push_instr & kRdMask)) {
+      if (Instruction::RdValue(pop_instr) != Instruction::RdValue(push_instr)) {
         // For consecutive push and pop on different registers,
         // we delete both the push & pop and insert a register move.
         // push ry, pop rx --> mov rx, ry
         Register reg_pushed, reg_popped;
         reg_pushed = GetRd(push_instr);
         reg_popped = GetRd(pop_instr);
         pc_ -= 2 * kInstrSize;
         // Insert a mov instruction, which is better than a pair of push & pop
         mov(reg_popped, reg_pushed);
         if (FLAG_print_peephole_optimization) {
@@ skipping 60 matching lines @@
   }
 
   if (can_peephole_optimize(3)) {
     Instr mem_write_instr = instr_at(pc_ - 3 * kInstrSize);
     Instr ldr_instr = instr_at(pc_ - 2 * kInstrSize);
     Instr mem_read_instr = instr_at(pc_ - 1 * kInstrSize);
     if (IsPush(mem_write_instr) &&
         IsPop(mem_read_instr)) {
       if ((IsLdrRegFpOffset(ldr_instr) ||
         IsLdrRegFpNegOffset(ldr_instr))) {
-        if ((mem_write_instr & kRdMask) ==
-              (mem_read_instr & kRdMask)) {
+        if (Instruction::RdValue(mem_write_instr) ==
+                                  Instruction::RdValue(mem_read_instr)) {
           // Pattern: push & pop from/to same register,
           // with a fp+offset ldr in between
           //
           // The following:
           // str rx, [sp, #-4]!
           // ldr rz, [fp, #-24]
           // ldr rx, [sp], #+4
           //
           // Becomes:
           // if(rx == rz)
           //   delete all
           // else
           //   ldr rz, [fp, #-24]
 
-          if ((mem_write_instr & kRdMask) == (ldr_instr & kRdMask)) {
+          if (Instruction::RdValue(mem_write_instr) ==
+              Instruction::RdValue(ldr_instr)) {
             pc_ -= 3 * kInstrSize;
           } else {
             pc_ -= 3 * kInstrSize;
             // Reinsert back the ldr rz.
             emit(ldr_instr);
           }
           if (FLAG_print_peephole_optimization) {
             PrintF("%x push/pop -dead ldr fp+offset in middle\n", pc_offset());
           }
         } else {
           // Pattern: push & pop from/to different registers
           // with a fp+offset ldr in between
           //
           // The following:
           // str rx, [sp, #-4]!
           // ldr rz, [fp, #-24]
           // ldr ry, [sp], #+4
           //
           // Becomes:
           // if(ry == rz)
           //   mov ry, rx;
           // else if(rx != rz)
           //   ldr rz, [fp, #-24]
           //   mov ry, rx
           // else if((ry != rz) || (rx == rz)) becomes:
           //   mov ry, rx
           //   ldr rz, [fp, #-24]
 
           Register reg_pushed, reg_popped;
-          if ((mem_read_instr & kRdMask) == (ldr_instr & kRdMask)) {
+          if (Instruction::RdValue(mem_read_instr) ==
+              Instruction::RdValue(ldr_instr)) {
             reg_pushed = GetRd(mem_write_instr);
             reg_popped = GetRd(mem_read_instr);
             pc_ -= 3 * kInstrSize;
             mov(reg_popped, reg_pushed);
-          } else if ((mem_write_instr & kRdMask)
-                                != (ldr_instr & kRdMask)) {
+          } else if (Instruction::RdValue(mem_write_instr) !=
+                     Instruction::RdValue(ldr_instr)) {
             reg_pushed = GetRd(mem_write_instr);
             reg_popped = GetRd(mem_read_instr);
             pc_ -= 3 * kInstrSize;
             emit(ldr_instr);
             mov(reg_popped, reg_pushed);
-          } else if (((mem_read_instr & kRdMask)
-                                     != (ldr_instr & kRdMask)) ||
-                    ((mem_write_instr & kRdMask)
-                                     == (ldr_instr & kRdMask)) ) {
+          } else if ((Instruction::RdValue(mem_read_instr) !=
+                      Instruction::RdValue(ldr_instr)) ||
+                     (Instruction::RdValue(mem_write_instr) ==
+                      Instruction::RdValue(ldr_instr))) {
             reg_pushed = GetRd(mem_write_instr);
             reg_popped = GetRd(mem_read_instr);
             pc_ -= 3 * kInstrSize;
             mov(reg_popped, reg_pushed);
             emit(ldr_instr);
           }
           if (FLAG_print_peephole_optimization) {
             PrintF("%x push/pop (ldr fp+off in middle)\n", pc_offset());
           }
         }
@@ skipping 101 matching lines @@
                     Condition cond) {
   addrmod4(cond | B27 | am, base, src);
 }
 
 
 // Exception-generating instructions and debugging support.
 // Stops with a non-negative code less than kNumOfWatchedStops support
 // enabling/disabling and a counter feature. See simulator-arm.h .
 void Assembler::stop(const char* msg, Condition cond, int32_t code) {
 #ifndef __arm__
-  // See constants-arm.h SoftwareInterruptCodes. Unluckily the Assembler and
-  // Simulator do not share constants declaration.
   ASSERT(code >= kDefaultStopCode);
-  static const uint32_t kStopInterruptCode = 1 << 23;
-  static const uint32_t kMaxStopCode = kStopInterruptCode - 1;
   // The Simulator will handle the stop instruction and get the message address.
   // It expects to find the address just after the svc instruction.
   BlockConstPoolFor(2);
   if (code >= 0) {
-    svc(kStopInterruptCode + code, cond);
+    svc(kStopCode + code, cond);
   } else {
-    svc(kStopInterruptCode + kMaxStopCode, cond);
+    svc(kStopCode + kMaxStopCode, cond);
   }
   emit(reinterpret_cast<Instr>(msg));
 #else  // def __arm__
 #ifdef CAN_USE_ARMV5_INSTRUCTIONS
-  ASSERT(cond == al);
-  bkpt(0);
+  if (cond != al) {
+    Label skip;
+    b(&skip, NegateCondition(cond));
+    bkpt(0);
+    bind(&skip);
+  } else {
+    bkpt(0);
+  }
 #else  // ndef CAN_USE_ARMV5_INSTRUCTIONS
   svc(0x9f0001, cond);
 #endif  // ndef CAN_USE_ARMV5_INSTRUCTIONS
 #endif  // def __arm__
 }
 
 
 void Assembler::bkpt(uint32_t imm16) {  // v5 and above
   ASSERT(is_uint16(imm16));
-  emit(al | B24 | B21 | (imm16 >> 4)*B8 | 7*B4 | (imm16 & 0xf));
+  emit(al | B24 | B21 | (imm16 >> 4)*B8 | BKPT | (imm16 & 0xf));
 }
 
 
 void Assembler::svc(uint32_t imm24, Condition cond) {
   ASSERT(is_uint24(imm24));
   emit(cond | 15*B24 | imm24);
 }
 
 
 // Coprocessor instructions.
 void Assembler::cdp(Coprocessor coproc,
                     int opcode_1,
                     CRegister crd,
                     CRegister crn,
                     CRegister crm,
                     int opcode_2,
                     Condition cond) {
   ASSERT(is_uint4(opcode_1) && is_uint3(opcode_2));
   emit(cond | B27 | B26 | B25 | (opcode_1 & 15)*B20 | crn.code()*B16 |
        crd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | crm.code());
 }
 
 
 void Assembler::cdp2(Coprocessor coproc,
                      int opcode_1,
                      CRegister crd,
                      CRegister crn,
                      CRegister crm,
                      int opcode_2) {  // v5 and above
-  cdp(coproc, opcode_1, crd, crn, crm, opcode_2, static_cast<Condition>(nv));
+  cdp(coproc, opcode_1, crd, crn, crm, opcode_2, kSpecialCondition);
 }
 
 
 void Assembler::mcr(Coprocessor coproc,
                     int opcode_1,
                     Register rd,
                     CRegister crn,
                     CRegister crm,
                     int opcode_2,
                     Condition cond) {
   ASSERT(is_uint3(opcode_1) && is_uint3(opcode_2));
   emit(cond | B27 | B26 | B25 | (opcode_1 & 7)*B21 | crn.code()*B16 |
        rd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | B4 | crm.code());
 }
 
 
 void Assembler::mcr2(Coprocessor coproc,
                      int opcode_1,
                      Register rd,
                      CRegister crn,
                      CRegister crm,
                      int opcode_2) {  // v5 and above
-  mcr(coproc, opcode_1, rd, crn, crm, opcode_2, static_cast<Condition>(nv));
+  mcr(coproc, opcode_1, rd, crn, crm, opcode_2, kSpecialCondition);
 }
 
 
 void Assembler::mrc(Coprocessor coproc,
                     int opcode_1,
                     Register rd,
                     CRegister crn,
                     CRegister crm,
                     int opcode_2,
                     Condition cond) {
   ASSERT(is_uint3(opcode_1) && is_uint3(opcode_2));
   emit(cond | B27 | B26 | B25 | (opcode_1 & 7)*B21 | L | crn.code()*B16 |
        rd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | B4 | crm.code());
 }
 
 
 void Assembler::mrc2(Coprocessor coproc,
                      int opcode_1,
                      Register rd,
                      CRegister crn,
                      CRegister crm,
                      int opcode_2) {  // v5 and above
-  mrc(coproc, opcode_1, rd, crn, crm, opcode_2, static_cast<Condition>(nv));
+  mrc(coproc, opcode_1, rd, crn, crm, opcode_2, kSpecialCondition);
 }
 
 
 void Assembler::ldc(Coprocessor coproc,
                     CRegister crd,
                     const MemOperand& src,
                     LFlag l,
                     Condition cond) {
   addrmod5(cond | B27 | B26 | l | L | coproc*B8, crd, src);
 }
 
 
 void Assembler::ldc(Coprocessor coproc,
                     CRegister crd,
                     Register rn,
                     int option,
                     LFlag l,
                     Condition cond) {
   // Unindexed addressing.
   ASSERT(is_uint8(option));
   emit(cond | B27 | B26 | U | l | L | rn.code()*B16 | crd.code()*B12 |
        coproc*B8 | (option & 255));
 }
 
 
 void Assembler::ldc2(Coprocessor coproc,
                      CRegister crd,
                      const MemOperand& src,
                      LFlag l) {  // v5 and above
-  ldc(coproc, crd, src, l, static_cast<Condition>(nv));
+  ldc(coproc, crd, src, l, kSpecialCondition);
 }
 
 
 void Assembler::ldc2(Coprocessor coproc,
                      CRegister crd,
                      Register rn,
                      int option,
                      LFlag l) {  // v5 and above
-  ldc(coproc, crd, rn, option, l, static_cast<Condition>(nv));
+  ldc(coproc, crd, rn, option, l, kSpecialCondition);
 }
 
 
 void Assembler::stc(Coprocessor coproc,
                     CRegister crd,
                     const MemOperand& dst,
                     LFlag l,
                     Condition cond) {
   addrmod5(cond | B27 | B26 | l | coproc*B8, crd, dst);
 }
 
 
 void Assembler::stc(Coprocessor coproc,
                     CRegister crd,
                     Register rn,
                     int option,
                     LFlag l,
                     Condition cond) {
   // Unindexed addressing.
   ASSERT(is_uint8(option));
   emit(cond | B27 | B26 | U | l | rn.code()*B16 | crd.code()*B12 |
        coproc*B8 | (option & 255));
 }
 
 
 void Assembler::stc2(Coprocessor
                      coproc, CRegister crd,
                      const MemOperand& dst,
                      LFlag l) {  // v5 and above
-  stc(coproc, crd, dst, l, static_cast<Condition>(nv));
+  stc(coproc, crd, dst, l, kSpecialCondition);
 }
 
 
 void Assembler::stc2(Coprocessor coproc,
                      CRegister crd,
                      Register rn,
                      int option,
                      LFlag l) {  // v5 and above
-  stc(coproc, crd, rn, option, l, static_cast<Condition>(nv));
+  stc(coproc, crd, rn, option, l, kSpecialCondition);
 }
 
 
 // Support for VFP.
 
 void Assembler::vldr(const DwVfpRegister dst,
                      const Register base,
                      int offset,
                      const Condition cond) {
   // Ddst = MEM(Rbase + offset).
@@ skipping 653 matching lines @@
     ASSERT(rinfo.rmode() != RelocInfo::COMMENT &&
            rinfo.rmode() != RelocInfo::POSITION);
     if (rinfo.rmode() != RelocInfo::JS_RETURN) {
       rinfo.set_pc(rinfo.pc() + pc_delta);
     }
   }
 }
 
 
 void Assembler::db(uint8_t data) {
+  // No relocation info should be pending while using db. db is used
+  // to write pure data with no pointers and the constant pool should
+  // be emitted before using db.
+  ASSERT(num_prinfo_ == 0);
   CheckBuffer();
   *reinterpret_cast<uint8_t*>(pc_) = data;
   pc_ += sizeof(uint8_t);
 }
 
 
 void Assembler::dd(uint32_t data) {
+  // No relocation info should be pending while using dd. dd is used
+  // to write pure data with no pointers and the constant pool should
+  // be emitted before using dd.
+  ASSERT(num_prinfo_ == 0);
   CheckBuffer();
   *reinterpret_cast<uint32_t*>(pc_) = data;
   pc_ += sizeof(uint32_t);
 }
 
 
 void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
   RelocInfo rinfo(pc_, rmode, data);  // we do not try to reuse pool constants
   if (rmode >= RelocInfo::JS_RETURN && rmode <= RelocInfo::DEBUG_BREAK_SLOT) {
     // Adjust code for new modes.
@@ skipping 101 matching lines @@
   // Emit constant pool entries.
   for (int i = 0; i < num_prinfo_; i++) {
     RelocInfo& rinfo = prinfo_[i];
     ASSERT(rinfo.rmode() != RelocInfo::COMMENT &&
            rinfo.rmode() != RelocInfo::POSITION &&
            rinfo.rmode() != RelocInfo::STATEMENT_POSITION);
     Instr instr = instr_at(rinfo.pc());
 
     // Instruction to patch must be a ldr/str [pc, #offset].
     // P and U set, B and W clear, Rn == pc, offset12 still 0.
-    ASSERT((instr & (7*B25 | P | U | B | W | 15*B16 | Off12Mask)) ==
+    ASSERT((instr & (7*B25 | P | U | B | W | 15*B16 | kOff12Mask)) ==
            (2*B25 | P | U | pc.code()*B16));
     int delta = pc_ - rinfo.pc() - 8;
     ASSERT(delta >= -4);  // instr could be ldr pc, [pc, #-4] followed by targ32
     if (delta < 0) {
       instr &= ~U;
       delta = -delta;
     }
     ASSERT(is_uint12(delta));
     instr_at_put(rinfo.pc(), instr + delta);
     emit(rinfo.data());
   }
   num_prinfo_ = 0;
   last_const_pool_end_ = pc_offset();
 
   RecordComment("]");
 
   if (after_pool.is_linked()) {
     bind(&after_pool);
   }
 
   // Since a constant pool was just emitted, move the check offset forward by
   // the standard interval.
   next_buffer_check_ = pc_offset() + kCheckConstInterval;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM