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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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5136 __ add(scratch_, object_, Operand(scratch_, LSR, kSmiTagSize)); | 5136 __ add(scratch_, object_, Operand(scratch_, LSR, kSmiTagSize)); |
5137 __ ldrb(result_, FieldMemOperand(scratch_, SeqAsciiString::kHeaderSize)); | 5137 __ ldrb(result_, FieldMemOperand(scratch_, SeqAsciiString::kHeaderSize)); |
5138 | 5138 |
5139 __ bind(&got_char_code); | 5139 __ bind(&got_char_code); |
5140 __ mov(result_, Operand(result_, LSL, kSmiTagSize)); | 5140 __ mov(result_, Operand(result_, LSL, kSmiTagSize)); |
5141 __ bind(&exit_); | 5141 __ bind(&exit_); |
5142 } | 5142 } |
5143 | 5143 |
5144 | 5144 |
5145 void StringCharCodeAtGenerator::GenerateSlow( | 5145 void StringCharCodeAtGenerator::GenerateSlow( |
5146 MacroAssembler* masm, const RuntimeCallHelper& call_helper) { | 5146 MacroAssembler* masm, |
| 5147 const RuntimeCallHelper& call_helper) { |
5147 __ Abort("Unexpected fallthrough to CharCodeAt slow case"); | 5148 __ Abort("Unexpected fallthrough to CharCodeAt slow case"); |
5148 | 5149 |
5149 // Index is not a smi. | 5150 // Index is not a smi. |
5150 __ bind(&index_not_smi_); | 5151 __ bind(&index_not_smi_); |
5151 // If index is a heap number, try converting it to an integer. | 5152 // If index is a heap number, try converting it to an integer. |
5152 __ CheckMap(index_, | 5153 __ CheckMap(index_, |
5153 scratch_, | 5154 scratch_, |
5154 Heap::kHeapNumberMapRootIndex, | 5155 Heap::kHeapNumberMapRootIndex, |
5155 index_not_number_, | 5156 index_not_number_, |
5156 DONT_DO_SMI_CHECK); | 5157 DONT_DO_SMI_CHECK); |
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5212 __ add(result_, result_, Operand(code_, LSL, kPointerSizeLog2 - kSmiTagSize)); | 5213 __ add(result_, result_, Operand(code_, LSL, kPointerSizeLog2 - kSmiTagSize)); |
5213 __ ldr(result_, FieldMemOperand(result_, FixedArray::kHeaderSize)); | 5214 __ ldr(result_, FieldMemOperand(result_, FixedArray::kHeaderSize)); |
5214 __ LoadRoot(ip, Heap::kUndefinedValueRootIndex); | 5215 __ LoadRoot(ip, Heap::kUndefinedValueRootIndex); |
5215 __ cmp(result_, Operand(ip)); | 5216 __ cmp(result_, Operand(ip)); |
5216 __ b(eq, &slow_case_); | 5217 __ b(eq, &slow_case_); |
5217 __ bind(&exit_); | 5218 __ bind(&exit_); |
5218 } | 5219 } |
5219 | 5220 |
5220 | 5221 |
5221 void StringCharFromCodeGenerator::GenerateSlow( | 5222 void StringCharFromCodeGenerator::GenerateSlow( |
5222 MacroAssembler* masm, const RuntimeCallHelper& call_helper) { | 5223 MacroAssembler* masm, |
| 5224 const RuntimeCallHelper& call_helper) { |
5223 __ Abort("Unexpected fallthrough to CharFromCode slow case"); | 5225 __ Abort("Unexpected fallthrough to CharFromCode slow case"); |
5224 | 5226 |
5225 __ bind(&slow_case_); | 5227 __ bind(&slow_case_); |
5226 call_helper.BeforeCall(masm); | 5228 call_helper.BeforeCall(masm); |
5227 __ push(code_); | 5229 __ push(code_); |
5228 __ CallRuntime(Runtime::kCharFromCode, 1); | 5230 __ CallRuntime(Runtime::kCharFromCode, 1); |
5229 __ Move(result_, r0); | 5231 __ Move(result_, r0); |
5230 call_helper.AfterCall(masm); | 5232 call_helper.AfterCall(masm); |
5231 __ jmp(&exit_); | 5233 __ jmp(&exit_); |
5232 | 5234 |
5233 __ Abort("Unexpected fallthrough from CharFromCode slow case"); | 5235 __ Abort("Unexpected fallthrough from CharFromCode slow case"); |
5234 } | 5236 } |
5235 | 5237 |
5236 | 5238 |
5237 // ------------------------------------------------------------------------- | 5239 // ------------------------------------------------------------------------- |
5238 // StringCharAtGenerator | 5240 // StringCharAtGenerator |
5239 | 5241 |
5240 void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) { | 5242 void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) { |
5241 char_code_at_generator_.GenerateFast(masm); | 5243 char_code_at_generator_.GenerateFast(masm); |
5242 char_from_code_generator_.GenerateFast(masm); | 5244 char_from_code_generator_.GenerateFast(masm); |
5243 } | 5245 } |
5244 | 5246 |
5245 | 5247 |
5246 void StringCharAtGenerator::GenerateSlow( | 5248 void StringCharAtGenerator::GenerateSlow( |
5247 MacroAssembler* masm, const RuntimeCallHelper& call_helper) { | 5249 MacroAssembler* masm, |
| 5250 const RuntimeCallHelper& call_helper) { |
5248 char_code_at_generator_.GenerateSlow(masm, call_helper); | 5251 char_code_at_generator_.GenerateSlow(masm, call_helper); |
5249 char_from_code_generator_.GenerateSlow(masm, call_helper); | 5252 char_from_code_generator_.GenerateSlow(masm, call_helper); |
5250 } | 5253 } |
5251 | 5254 |
5252 | 5255 |
5253 class StringHelper : public AllStatic { | 5256 class StringHelper : public AllStatic { |
5254 public: | 5257 public: |
5255 // Generate code for copying characters using a simple loop. This should only | 5258 // Generate code for copying characters using a simple loop. This should only |
5256 // be used in places where the number of characters is small and the | 5259 // be used in places where the number of characters is small and the |
5257 // additional setup and checking in GenerateCopyCharactersLong adds too much | 5260 // additional setup and checking in GenerateCopyCharactersLong adds too much |
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6743 StringDictionaryLookupStub stub(NEGATIVE_LOOKUP); | 6746 StringDictionaryLookupStub stub(NEGATIVE_LOOKUP); |
6744 __ CallStub(&stub); | 6747 __ CallStub(&stub); |
6745 __ tst(r0, Operand(r0)); | 6748 __ tst(r0, Operand(r0)); |
6746 __ ldm(ia_w, sp, spill_mask); | 6749 __ ldm(ia_w, sp, spill_mask); |
6747 | 6750 |
6748 __ b(eq, done); | 6751 __ b(eq, done); |
6749 __ b(ne, miss); | 6752 __ b(ne, miss); |
6750 } | 6753 } |
6751 | 6754 |
6752 | 6755 |
6753 // TODO(kmillikin): Eliminate this function when the stub cache is fully | |
6754 // handlified. | |
6755 MaybeObject* StringDictionaryLookupStub::TryGenerateNegativeLookup( | |
6756 MacroAssembler* masm, | |
6757 Label* miss, | |
6758 Label* done, | |
6759 Register receiver, | |
6760 Register properties, | |
6761 String* name, | |
6762 Register scratch0) { | |
6763 // If names of slots in range from 1 to kProbes - 1 for the hash value are | |
6764 // not equal to the name and kProbes-th slot is not used (its name is the | |
6765 // undefined value), it guarantees the hash table doesn't contain the | |
6766 // property. It's true even if some slots represent deleted properties | |
6767 // (their names are the null value). | |
6768 for (int i = 0; i < kInlinedProbes; i++) { | |
6769 // scratch0 points to properties hash. | |
6770 // Compute the masked index: (hash + i + i * i) & mask. | |
6771 Register index = scratch0; | |
6772 // Capacity is smi 2^n. | |
6773 __ ldr(index, FieldMemOperand(properties, kCapacityOffset)); | |
6774 __ sub(index, index, Operand(1)); | |
6775 __ and_(index, index, Operand( | |
6776 Smi::FromInt(name->Hash() + StringDictionary::GetProbeOffset(i)))); | |
6777 | |
6778 // Scale the index by multiplying by the entry size. | |
6779 ASSERT(StringDictionary::kEntrySize == 3); | |
6780 __ add(index, index, Operand(index, LSL, 1)); // index *= 3. | |
6781 | |
6782 Register entity_name = scratch0; | |
6783 // Having undefined at this place means the name is not contained. | |
6784 ASSERT_EQ(kSmiTagSize, 1); | |
6785 Register tmp = properties; | |
6786 __ add(tmp, properties, Operand(index, LSL, 1)); | |
6787 __ ldr(entity_name, FieldMemOperand(tmp, kElementsStartOffset)); | |
6788 | |
6789 ASSERT(!tmp.is(entity_name)); | |
6790 __ LoadRoot(tmp, Heap::kUndefinedValueRootIndex); | |
6791 __ cmp(entity_name, tmp); | |
6792 __ b(eq, done); | |
6793 | |
6794 if (i != kInlinedProbes - 1) { | |
6795 // Stop if found the property. | |
6796 __ cmp(entity_name, Operand(Handle<String>(name))); | |
6797 __ b(eq, miss); | |
6798 | |
6799 // Check if the entry name is not a symbol. | |
6800 __ ldr(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset)); | |
6801 __ ldrb(entity_name, | |
6802 FieldMemOperand(entity_name, Map::kInstanceTypeOffset)); | |
6803 __ tst(entity_name, Operand(kIsSymbolMask)); | |
6804 __ b(eq, miss); | |
6805 | |
6806 // Restore the properties. | |
6807 __ ldr(properties, | |
6808 FieldMemOperand(receiver, JSObject::kPropertiesOffset)); | |
6809 } | |
6810 } | |
6811 | |
6812 const int spill_mask = | |
6813 (lr.bit() | r6.bit() | r5.bit() | r4.bit() | r3.bit() | | |
6814 r2.bit() | r1.bit() | r0.bit()); | |
6815 | |
6816 __ stm(db_w, sp, spill_mask); | |
6817 __ ldr(r0, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); | |
6818 __ mov(r1, Operand(Handle<String>(name))); | |
6819 StringDictionaryLookupStub stub(NEGATIVE_LOOKUP); | |
6820 MaybeObject* result = masm->TryCallStub(&stub); | |
6821 if (result->IsFailure()) return result; | |
6822 __ tst(r0, Operand(r0)); | |
6823 __ ldm(ia_w, sp, spill_mask); | |
6824 | |
6825 __ b(eq, done); | |
6826 __ b(ne, miss); | |
6827 return result; | |
6828 } | |
6829 | |
6830 | |
6831 // Probe the string dictionary in the |elements| register. Jump to the | 6756 // Probe the string dictionary in the |elements| register. Jump to the |
6832 // |done| label if a property with the given name is found. Jump to | 6757 // |done| label if a property with the given name is found. Jump to |
6833 // the |miss| label otherwise. | 6758 // the |miss| label otherwise. |
6834 // If lookup was successful |scratch2| will be equal to elements + 4 * index. | 6759 // If lookup was successful |scratch2| will be equal to elements + 4 * index. |
6835 void StringDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm, | 6760 void StringDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm, |
6836 Label* miss, | 6761 Label* miss, |
6837 Label* done, | 6762 Label* done, |
6838 Register elements, | 6763 Register elements, |
6839 Register name, | 6764 Register name, |
6840 Register scratch1, | 6765 Register scratch1, |
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7252 __ bind(&need_incremental); | 7177 __ bind(&need_incremental); |
7253 | 7178 |
7254 // Fall through when we need to inform the incremental marker. | 7179 // Fall through when we need to inform the incremental marker. |
7255 } | 7180 } |
7256 | 7181 |
7257 #undef __ | 7182 #undef __ |
7258 | 7183 |
7259 } } // namespace v8::internal | 7184 } } // namespace v8::internal |
7260 | 7185 |
7261 #endif // V8_TARGET_ARCH_ARM | 7186 #endif // V8_TARGET_ARCH_ARM |
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