Generate inline code for contextual loads on ARM....

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 379 matching lines @@
   }
 }
 
 
 void Assembler::CodeTargetAlign() {
   // Preferred alignment of jump targets on some ARM chips.
   Align(8);
 }
 
 
-bool Assembler::IsNop(Instr instr, int type) {
-  // Check for mov rx, rx.
-  ASSERT(0 <= type && type <= 14);  // mov pc, pc is not a nop.
-  return instr == (al | 13*B21 | type*B12 | type);
-}
-
-
 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;
@@ skipping 86 matching lines @@
 bool Assembler::IsStrRegFpNegOffset(Instr instr) {
   return ((instr & kLdrStrInstrTypeMask) == kStrRegFpNegOffsetPattern);
 }
 
 
 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;
+}
+
+
 // 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.
 
@@ skipping 583 matching lines @@
                     SBit s, Condition cond) {
   addrmod1(cond | 12*B21 | 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)
-  // pseudo instructions.
+  // 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);
 }
 
 
 void Assembler::movw(Register reg, uint32_t immediate, Condition cond) {
   ASSERT(immediate < 0x10000);
   mov(reg, Operand(immediate), LeaveCC, cond);
 }
 
@@ skipping 1241 matching lines @@
 
 
 // Pseudo instructions.
 void Assembler::nop(int type) {
   // This is mov rx, rx.
   ASSERT(0 <= type && type <= 14);  // mov pc, pc is not a nop.
   emit(al | 13*B21 | type*B12 | type);
 }
 
 
+bool Assembler::IsNop(Instr instr, int type) {
+  // Check for mov rx, rx.
+  ASSERT(0 <= type && type <= 14);  // mov pc, pc is not a nop.
+  return instr == (al | 13*B21 | type*B12 | type);
+}
+
+
 bool Assembler::ImmediateFitsAddrMode1Instruction(int32_t imm32) {
   uint32_t dummy1;
   uint32_t dummy2;
   return fits_shifter(imm32, &dummy1, &dummy2, NULL);
 }
 
 
 void Assembler::BlockConstPoolFor(int instructions) {
   BlockConstPoolBefore(pc_offset() + instructions * kInstrSize);
 }
@@ skipping 211 matching lines @@
 
   // 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