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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 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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839 ASSERT(size >= 0); | 839 ASSERT(size >= 0); |
840 ASSERT(static_cast<uint64_t>(size) == SizeOfCodeGeneratedSince(label)); | 840 ASSERT(static_cast<uint64_t>(size) == SizeOfCodeGeneratedSince(label)); |
841 } | 841 } |
842 | 842 |
843 // Return the number of instructions generated from label to the | 843 // Return the number of instructions generated from label to the |
844 // current position. | 844 // current position. |
845 int InstructionsGeneratedSince(const Label* label) { | 845 int InstructionsGeneratedSince(const Label* label) { |
846 return SizeOfCodeGeneratedSince(label) / kInstructionSize; | 846 return SizeOfCodeGeneratedSince(label) / kInstructionSize; |
847 } | 847 } |
848 | 848 |
849 // TODO(all): Initialize these constants related with code patching. | |
850 // TODO(all): Set to -1 to hopefully crash if mistakenly used. | |
851 | |
852 // Number of instructions generated for the return sequence in | 849 // Number of instructions generated for the return sequence in |
853 // FullCodeGenerator::EmitReturnSequence. | 850 // FullCodeGenerator::EmitReturnSequence. |
854 static const int kJSRetSequenceInstructions = 7; | 851 static const int kJSRetSequenceInstructions = 7; |
855 // Distance between start of patched return sequence and the emitted address | 852 // Distance between start of patched return sequence and the emitted address |
856 // to jump to. | 853 // to jump to. |
857 static const int kPatchReturnSequenceAddressOffset = 0; | 854 static const int kPatchReturnSequenceAddressOffset = 0; |
858 static const int kPatchDebugBreakSlotAddressOffset = 0; | 855 static const int kPatchDebugBreakSlotAddressOffset = 0; |
859 | 856 |
860 // Number of instructions necessary to be able to later patch it to a call. | 857 // Number of instructions necessary to be able to later patch it to a call. |
861 // See Debug::GenerateSlot() and BreakLocationIterator::SetDebugBreakAtSlot(). | 858 // See Debug::GenerateSlot() and BreakLocationIterator::SetDebugBreakAtSlot(). |
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2192 class EnsureSpace BASE_EMBEDDED { | 2189 class EnsureSpace BASE_EMBEDDED { |
2193 public: | 2190 public: |
2194 explicit EnsureSpace(Assembler* assembler) { | 2191 explicit EnsureSpace(Assembler* assembler) { |
2195 assembler->CheckBuffer(); | 2192 assembler->CheckBuffer(); |
2196 } | 2193 } |
2197 }; | 2194 }; |
2198 | 2195 |
2199 } } // namespace v8::internal | 2196 } } // namespace v8::internal |
2200 | 2197 |
2201 #endif // V8_A64_ASSEMBLER_A64_H_ | 2198 #endif // V8_A64_ASSEMBLER_A64_H_ |
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