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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "vm/globals.h" // Needed here to get TARGET_ARCH_MIPS. | 5 #include "vm/globals.h" // Needed here to get TARGET_ARCH_MIPS. |
6 #if defined(TARGET_ARCH_MIPS) | 6 #if defined(TARGET_ARCH_MIPS) |
7 | 7 |
8 #include "vm/code_patcher.h" | 8 #include "vm/code_patcher.h" |
9 | 9 |
10 #include "vm/instructions.h" | 10 #include "vm/instructions.h" |
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81 | 81 |
82 RawCode* CodePatcher::GetNativeCallAt(uword return_address, | 82 RawCode* CodePatcher::GetNativeCallAt(uword return_address, |
83 const Code& code, | 83 const Code& code, |
84 NativeFunction* target) { | 84 NativeFunction* target) { |
85 ASSERT(code.ContainsInstructionAt(return_address)); | 85 ASSERT(code.ContainsInstructionAt(return_address)); |
86 NativeCallPattern call(return_address, code); | 86 NativeCallPattern call(return_address, code); |
87 *target = call.native_function(); | 87 *target = call.native_function(); |
88 return call.target(); | 88 return call.target(); |
89 } | 89 } |
90 | 90 |
91 | |
92 // This class pattern matches on a load from the object pool. Loading on | |
93 // MIPS is complicated because it can take four possible different forms. | |
94 // We match backwards from the end of the sequence so we can reuse the code | |
95 // for matching object pool loads at calls. | |
96 class EdgeCounter : public ValueObject { | |
97 public: | |
98 EdgeCounter(uword pc, const Code& code) | |
99 : end_(pc - kAdjust), | |
100 object_pool_(ObjectPool::Handle(code.GetObjectPool())) { | |
101 // An IsValid predicate is complicated and duplicates the code in the | |
102 // decoding function. Instead we rely on decoding the pattern which | |
103 // will assert partial validity. | |
104 } | |
105 | |
106 RawObject* edge_counter() const { | |
107 Register ignored; | |
108 intptr_t index; | |
109 InstructionPattern::DecodeLoadWordFromPool(end_, &ignored, &index); | |
110 ASSERT(ignored == T0); | |
111 return object_pool_.ObjectAt(index); | |
112 } | |
113 | |
114 private: | |
115 // The object pool load is followed by the fixed-size edge counter | |
116 // incrementing code: | |
117 // lw r9, 11(r8) | |
118 // addiu r9, r9, 2 | |
119 // sw r9, 11(r8) | |
120 static const intptr_t kAdjust = 3 * Instr::kInstrSize; | |
121 | |
122 uword end_; | |
123 const ObjectPool& object_pool_; | |
124 }; | |
125 | |
126 | |
127 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) { | |
128 ASSERT(code.ContainsInstructionAt(pc)); | |
129 EdgeCounter counter(pc, code); | |
130 return counter.edge_counter(); | |
131 } | |
132 | |
133 } // namespace dart | 91 } // namespace dart |
134 | 92 |
135 #endif // defined TARGET_ARCH_MIPS | 93 #endif // defined TARGET_ARCH_MIPS |
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