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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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_X64. | 5 #include "vm/globals.h" // Needed here to get TARGET_ARCH_X64. |
6 #if defined(TARGET_ARCH_X64) | 6 #if defined(TARGET_ARCH_X64) |
7 | 7 |
8 #include "vm/assembler.h" | 8 #include "vm/assembler.h" |
9 #include "vm/code_patcher.h" | 9 #include "vm/code_patcher.h" |
10 #include "vm/cpu.h" | 10 #include "vm/cpu.h" |
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261 | 261 |
262 RawCode* CodePatcher::GetNativeCallAt(uword return_address, | 262 RawCode* CodePatcher::GetNativeCallAt(uword return_address, |
263 const Code& code, | 263 const Code& code, |
264 NativeFunction* target) { | 264 NativeFunction* target) { |
265 ASSERT(code.ContainsInstructionAt(return_address)); | 265 ASSERT(code.ContainsInstructionAt(return_address)); |
266 NativeCall call(return_address, code); | 266 NativeCall call(return_address, code); |
267 *target = call.native_function(); | 267 *target = call.native_function(); |
268 return call.target(); | 268 return call.target(); |
269 } | 269 } |
270 | 270 |
271 | |
272 // The expected code pattern of an edge counter in unoptimized code: | |
273 // 49 8b 87 imm32 mov RAX, [PP + offset] | |
274 class EdgeCounter : public ValueObject { | |
275 public: | |
276 EdgeCounter(uword pc, const Code& code) | |
277 : end_(pc - FlowGraphCompiler::EdgeCounterIncrementSizeInBytes()), | |
278 object_pool_(ObjectPool::Handle(code.GetObjectPool())) { | |
279 ASSERT(IsValid(end_)); | |
280 } | |
281 | |
282 static bool IsValid(uword end) { | |
283 uint8_t* bytes = reinterpret_cast<uint8_t*>(end - 7); | |
284 return (bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x87); | |
285 } | |
286 | |
287 RawObject* edge_counter() const { | |
288 return object_pool_.ObjectAt(IndexFromPPLoad(end_ - 4)); | |
289 } | |
290 | |
291 private: | |
292 uword end_; | |
293 const ObjectPool& object_pool_; | |
294 }; | |
295 | |
296 | |
297 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) { | |
298 ASSERT(code.ContainsInstructionAt(pc)); | |
299 EdgeCounter counter(pc, code); | |
300 return counter.edge_counter(); | |
301 } | |
302 | |
303 } // namespace dart | 271 } // namespace dart |
304 | 272 |
305 #endif // defined TARGET_ARCH_X64 | 273 #endif // defined TARGET_ARCH_X64 |
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