MIPS: Minor-key-ify remaining code stubs.

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 127 matching lines @@
             MemOperand(sp, (param_count-1-i) * kPointerSize));
     }
     ExternalReference miss = descriptor->miss_handler();
     __ CallExternalReference(miss, param_count);
   }
 
   __ Ret();
 }
 
 
-// Takes a Smi and converts to an IEEE 64 bit floating point value in two
-// registers.  The format is 1 sign bit, 11 exponent bits (biased 1023) and
-// 52 fraction bits (20 in the first word, 32 in the second).  Zeros is a
-// scratch register.  Destroys the source register.  No GC occurs during this
-// stub so you don't have to set up the frame.
-class ConvertToDoubleStub : public PlatformCodeStub {
- public:
-  ConvertToDoubleStub(Isolate* isolate,
-                      Register result_reg_1,
-                      Register result_reg_2,
-                      Register source_reg,
-                      Register scratch_reg)
-      : PlatformCodeStub(isolate),
-        result1_(result_reg_1),
-        result2_(result_reg_2),
-        source_(source_reg),
-        zeros_(scratch_reg) { }
-
- private:
-  Register result1_;
-  Register result2_;
-  Register source_;
-  Register zeros_;
-
-  // Minor key encoding in 16 bits.
-  class ModeBits: public BitField<OverwriteMode, 0, 2> {};
-  class OpBits: public BitField<Token::Value, 2, 14> {};
-
-  Major MajorKey() const { return ConvertToDouble; }
-  uint32_t MinorKey() const {
-    // Encode the parameters in a unique 16 bit value.
-    return  result1_.code() +
-           (result2_.code() << 4) +
-           (source_.code() << 8) +
-           (zeros_.code() << 12);
-  }
-
-  void Generate(MacroAssembler* masm);
-};
-
-
-void ConvertToDoubleStub::Generate(MacroAssembler* masm) {
-  Register exponent, mantissa;
-  if (kArchEndian == kLittle) {
-    exponent = result1_;
-    mantissa = result2_;
-  } else {
-    exponent = result2_;
-    mantissa = result1_;
-  }
-  Label not_special;
-  // Convert from Smi to integer.
-  __ sra(source_, source_, kSmiTagSize);
-  // Move sign bit from source to destination.  This works because the sign bit
-  // in the exponent word of the double has the same position and polarity as
-  // the 2's complement sign bit in a Smi.
-  STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
-  __ And(exponent, source_, Operand(HeapNumber::kSignMask));
-  // Subtract from 0 if source was negative.
-  __ subu(at, zero_reg, source_);
-  __ Movn(source_, at, exponent);
-
-  // We have -1, 0 or 1, which we treat specially. Register source_ contains
-  // absolute value: it is either equal to 1 (special case of -1 and 1),
-  // greater than 1 (not a special case) or less than 1 (special case of 0).
-  __ Branch(&not_special, gt, source_, Operand(1));
-
-  // For 1 or -1 we need to or in the 0 exponent (biased to 1023).
-  const uint32_t exponent_word_for_1 =
-      HeapNumber::kExponentBias << HeapNumber::kExponentShift;
-  // Safe to use 'at' as dest reg here.
-  __ Or(at, exponent, Operand(exponent_word_for_1));
-  __ Movn(exponent, at, source_);  // Write exp when source not 0.
-  // 1, 0 and -1 all have 0 for the second word.
-  __ Ret(USE_DELAY_SLOT);
-  __ mov(mantissa, zero_reg);
-
-  __ bind(&not_special);
-  // Count leading zeros.
-  // Gets the wrong answer for 0, but we already checked for that case above.
-  __ Clz(zeros_, source_);
-  // Compute exponent and or it into the exponent register.
-  // We use mantissa as a scratch register here.
-  __ li(mantissa, Operand(31 + HeapNumber::kExponentBias));
-  __ subu(mantissa, mantissa, zeros_);
-  __ sll(mantissa, mantissa, HeapNumber::kExponentShift);
-  __ Or(exponent, exponent, mantissa);
-
-  // Shift up the source chopping the top bit off.
-  __ Addu(zeros_, zeros_, Operand(1));
-  // This wouldn't work for 1.0 or -1.0 as the shift would be 32 which means 0.
-  __ sllv(source_, source_, zeros_);
-  // Compute lower part of fraction (last 12 bits).
-  __ sll(mantissa, source_, HeapNumber::kMantissaBitsInTopWord);
-  // And the top (top 20 bits).
-  __ srl(source_, source_, 32 - HeapNumber::kMantissaBitsInTopWord);
-
-  __ Ret(USE_DELAY_SLOT);
-  __ or_(exponent, exponent, source_);
-}
-
-
 void DoubleToIStub::Generate(MacroAssembler* masm) {
   Label out_of_range, only_low, negate, done;
   Register input_reg = source();
   Register result_reg = destination();
 
   int double_offset = offset();
   // Account for saved regs if input is sp.
   if (input_reg.is(sp)) double_offset += 3 * kPointerSize;
 
   Register scratch =
@@ skipping 136 matching lines @@
 }
 
 
 // See comment for class, this does NOT work for int32's that are in Smi range.
 void WriteInt32ToHeapNumberStub::Generate(MacroAssembler* masm) {
   Label max_negative_int;
   // the_int_ has the answer which is a signed int32 but not a Smi.
   // We test for the special value that has a different exponent.
   STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
   // Test sign, and save for later conditionals.
-  __ And(sign_, the_int_, Operand(0x80000000u));
-  __ Branch(&max_negative_int, eq, the_int_, Operand(0x80000000u));
+  __ And(sign(), the_int(), Operand(0x80000000u));
+  __ Branch(&max_negative_int, eq, the_int(), Operand(0x80000000u));
 
   // Set up the correct exponent in scratch_.  All non-Smi int32s have the same.
   // A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased).
   uint32_t non_smi_exponent =
       (HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift;
-  __ li(scratch_, Operand(non_smi_exponent));
+  __ li(scratch(), Operand(non_smi_exponent));
   // Set the sign bit in scratch_ if the value was negative.
-  __ or_(scratch_, scratch_, sign_);
+  __ or_(scratch(), scratch(), sign());
   // Subtract from 0 if the value was negative.
-  __ subu(at, zero_reg, the_int_);
-  __ Movn(the_int_, at, sign_);
+  __ subu(at, zero_reg, the_int());
+  __ Movn(the_int(), at, sign());
   // We should be masking the implict first digit of the mantissa away here,
   // but it just ends up combining harmlessly with the last digit of the
   // exponent that happens to be 1.  The sign bit is 0 so we shift 10 to get
   // the most significant 1 to hit the last bit of the 12 bit sign and exponent.
   DCHECK(((1 << HeapNumber::kExponentShift) & non_smi_exponent) != 0);
   const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
-  __ srl(at, the_int_, shift_distance);
-  __ or_(scratch_, scratch_, at);
-  __ sw(scratch_, FieldMemOperand(the_heap_number_,
+  __ srl(at, the_int(), shift_distance);
+  __ or_(scratch(), scratch(), at);
+  __ sw(scratch(), FieldMemOperand(the_heap_number(),
                                    HeapNumber::kExponentOffset));
-  __ sll(scratch_, the_int_, 32 - shift_distance);
+  __ sll(scratch(), the_int(), 32 - shift_distance);
   __ Ret(USE_DELAY_SLOT);
-  __ sw(scratch_, FieldMemOperand(the_heap_number_,
+  __ sw(scratch(), FieldMemOperand(the_heap_number(),
                                    HeapNumber::kMantissaOffset));
 
   __ bind(&max_negative_int);
   // The max negative int32 is stored as a positive number in the mantissa of
   // a double because it uses a sign bit instead of using two's complement.
   // The actual mantissa bits stored are all 0 because the implicit most
   // significant 1 bit is not stored.
   non_smi_exponent += 1 << HeapNumber::kExponentShift;
-  __ li(scratch_, Operand(HeapNumber::kSignMask | non_smi_exponent));
-  __ sw(scratch_,
-        FieldMemOperand(the_heap_number_, HeapNumber::kExponentOffset));
-  __ mov(scratch_, zero_reg);
+  __ li(scratch(), Operand(HeapNumber::kSignMask | non_smi_exponent));
+  __ sw(scratch(),
+        FieldMemOperand(the_heap_number(), HeapNumber::kExponentOffset));
+  __ mov(scratch(), zero_reg);
   __ Ret(USE_DELAY_SLOT);
-  __ sw(scratch_,
-        FieldMemOperand(the_heap_number_, HeapNumber::kMantissaOffset));
+  __ sw(scratch(),
+        FieldMemOperand(the_heap_number(), HeapNumber::kMantissaOffset));
 }
 
 
 // Handle the case where the lhs and rhs are the same object.
 // Equality is almost reflexive (everything but NaN), so this is a test
 // for "identity and not NaN".
 static void EmitIdenticalObjectComparison(MacroAssembler* masm,
                                           Label* slow,
                                           Condition cc) {
   Label not_identical;
@@ skipping 3764 matching lines @@
     __ sll(index, index, 2);
     __ Addu(index, index, dictionary);
     __ lw(entry_key, FieldMemOperand(index, kElementsStartOffset));
 
     // Having undefined at this place means the name is not contained.
     __ Branch(&not_in_dictionary, eq, entry_key, Operand(undefined));
 
     // Stop if found the property.
     __ Branch(&in_dictionary, eq, entry_key, Operand(key));
 
-    if (i != kTotalProbes - 1 && mode_ == NEGATIVE_LOOKUP) {
+    if (i != kTotalProbes - 1 && mode() == NEGATIVE_LOOKUP) {
       // Check if the entry name is not a unique name.
       __ lw(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
       __ lbu(entry_key,
              FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
       __ JumpIfNotUniqueName(entry_key, &maybe_in_dictionary);
     }
   }
 
   __ bind(&maybe_in_dictionary);
   // If we are doing negative lookup then probing failure should be
   // treated as a lookup success. For positive lookup probing failure
   // should be treated as lookup failure.
-  if (mode_ == POSITIVE_LOOKUP) {
+  if (mode() == POSITIVE_LOOKUP) {
     __ Ret(USE_DELAY_SLOT);
     __ mov(result, zero_reg);
   }
 
   __ bind(&in_dictionary);
   __ Ret(USE_DELAY_SLOT);
   __ li(result, 1);
 
   __ bind(&not_in_dictionary);
   __ Ret(USE_DELAY_SLOT);
@@ skipping 23 matching lines @@
   // get the offset fixed up correctly by the bind(Label*) call.  We patch it
   // back and forth between a "bne zero_reg, zero_reg, ..." (a nop in this
   // position) and the "beq zero_reg, zero_reg, ..." when we start and stop
   // incremental heap marking.
   // See RecordWriteStub::Patch for details.
   __ beq(zero_reg, zero_reg, &skip_to_incremental_noncompacting);
   __ nop();
   __ beq(zero_reg, zero_reg, &skip_to_incremental_compacting);
   __ nop();
 
-  if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
-    __ RememberedSetHelper(object_,
-                           address_,
-                           value_,
-                           save_fp_regs_mode_,
+  if (remembered_set_action() == EMIT_REMEMBERED_SET) {
+    __ RememberedSetHelper(object(),
+                           address(),
+                           value(),
+                           save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   }
   __ Ret();
 
   __ bind(&skip_to_incremental_noncompacting);
   GenerateIncremental(masm, INCREMENTAL);
 
   __ bind(&skip_to_incremental_compacting);
   GenerateIncremental(masm, INCREMENTAL_COMPACTION);
 
   // Initial mode of the stub is expected to be STORE_BUFFER_ONLY.
   // Will be checked in IncrementalMarking::ActivateGeneratedStub.
 
   PatchBranchIntoNop(masm, 0);
   PatchBranchIntoNop(masm, 2 * Assembler::kInstrSize);
 }
 
 
 void RecordWriteStub::GenerateIncremental(MacroAssembler* masm, Mode mode) {
   regs_.Save(masm);
 
-  if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
+  if (remembered_set_action() == EMIT_REMEMBERED_SET) {
     Label dont_need_remembered_set;
 
     __ lw(regs_.scratch0(), MemOperand(regs_.address(), 0));
     __ JumpIfNotInNewSpace(regs_.scratch0(),  // Value.
                            regs_.scratch0(),
                            &dont_need_remembered_set);
 
     __ CheckPageFlag(regs_.object(),
                      regs_.scratch0(),
                      1 << MemoryChunk::SCAN_ON_SCAVENGE,
                      ne,
                      &dont_need_remembered_set);
 
     // First notify the incremental marker if necessary, then update the
     // remembered set.
     CheckNeedsToInformIncrementalMarker(
         masm, kUpdateRememberedSetOnNoNeedToInformIncrementalMarker, mode);
     InformIncrementalMarker(masm);
     regs_.Restore(masm);
-    __ RememberedSetHelper(object_,
-                           address_,
-                           value_,
-                           save_fp_regs_mode_,
+    __ RememberedSetHelper(object(),
+                           address(),
+                           value(),
+                           save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
 
     __ bind(&dont_need_remembered_set);
   }
 
   CheckNeedsToInformIncrementalMarker(
       masm, kReturnOnNoNeedToInformIncrementalMarker, mode);
   InformIncrementalMarker(masm);
   regs_.Restore(masm);
   __ Ret();
 }
 
 
 void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm) {
-  regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode_);
+  regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode());
   int argument_count = 3;
   __ PrepareCallCFunction(argument_count, regs_.scratch0());
   Register address =
       a0.is(regs_.address()) ? regs_.scratch0() : regs_.address();
   DCHECK(!address.is(regs_.object()));
   DCHECK(!address.is(a0));
   __ Move(address, regs_.address());
   __ Move(a0, regs_.object());
   __ Move(a1, address);
   __ li(a2, Operand(ExternalReference::isolate_address(isolate())));
 
   AllowExternalCallThatCantCauseGC scope(masm);
   __ CallCFunction(
       ExternalReference::incremental_marking_record_write_function(isolate()),
       argument_count);
-  regs_.RestoreCallerSaveRegisters(masm, save_fp_regs_mode_);
+  regs_.RestoreCallerSaveRegisters(masm, save_fp_regs_mode());
 }
 
 
 void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
     MacroAssembler* masm,
     OnNoNeedToInformIncrementalMarker on_no_need,
     Mode mode) {
   Label on_black;
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
   __ And(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
   __ lw(regs_.scratch1(),
         MemOperand(regs_.scratch0(),
                    MemoryChunk::kWriteBarrierCounterOffset));
   __ Subu(regs_.scratch1(), regs_.scratch1(), Operand(1));
   __ sw(regs_.scratch1(),
          MemOperand(regs_.scratch0(),
                     MemoryChunk::kWriteBarrierCounterOffset));
   __ Branch(&need_incremental, lt, regs_.scratch1(), Operand(zero_reg));
 
   // Let's look at the color of the object:  If it is not black we don't have
   // to inform the incremental marker.
   __ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);
 
   regs_.Restore(masm);
   if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
-    __ RememberedSetHelper(object_,
-                           address_,
-                           value_,
-                           save_fp_regs_mode_,
+    __ RememberedSetHelper(object(),
+                           address(),
+                           value(),
+                           save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   } else {
     __ Ret();
   }
 
   __ bind(&on_black);
 
   // Get the value from the slot.
   __ lw(regs_.scratch0(), MemOperand(regs_.address(), 0));
 
@@ skipping 20 matching lines @@
   __ Push(regs_.object(), regs_.address());
   __ EnsureNotWhite(regs_.scratch0(),  // The value.
                     regs_.scratch1(),  // Scratch.
                     regs_.object(),  // Scratch.
                     regs_.address(),  // Scratch.
                     &need_incremental_pop_scratch);
   __ Pop(regs_.object(), regs_.address());
 
   regs_.Restore(masm);
   if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
-    __ RememberedSetHelper(object_,
-                           address_,
-                           value_,
-                           save_fp_regs_mode_,
+    __ RememberedSetHelper(object(),
+                           address(),
+                           value(),
+                           save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   } else {
     __ Ret();
   }
 
   __ bind(&need_incremental_pop_scratch);
   __ Pop(regs_.object(), regs_.address());
 
   __ bind(&need_incremental);
 
@@ skipping 587 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS