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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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| 303 | 303 |
| 304 void FullCodeGenerator::EmitProfilingCounterDecrement(int delta) { | 304 void FullCodeGenerator::EmitProfilingCounterDecrement(int delta) { |
| 305 __ movq(rbx, profiling_counter_, RelocInfo::EMBEDDED_OBJECT); | 305 __ movq(rbx, profiling_counter_, RelocInfo::EMBEDDED_OBJECT); |
| 306 __ SmiAddConstant(FieldOperand(rbx, Cell::kValueOffset), | 306 __ SmiAddConstant(FieldOperand(rbx, Cell::kValueOffset), |
| 307 Smi::FromInt(-delta)); | 307 Smi::FromInt(-delta)); |
| 308 } | 308 } |
| 309 | 309 |
| 310 | 310 |
| 311 void FullCodeGenerator::EmitProfilingCounterReset() { | 311 void FullCodeGenerator::EmitProfilingCounterReset() { |
| 312 int reset_value = FLAG_interrupt_budget; | 312 int reset_value = FLAG_interrupt_budget; |
| 313 if (info_->ShouldSelfOptimize() && !FLAG_retry_self_opt) { | |
| 314 // Self-optimization is a one-off thing; if it fails, don't try again. | |
| 315 reset_value = Smi::kMaxValue; | |
| 316 } | |
| 317 __ movq(rbx, profiling_counter_, RelocInfo::EMBEDDED_OBJECT); | 313 __ movq(rbx, profiling_counter_, RelocInfo::EMBEDDED_OBJECT); |
| 318 __ Move(kScratchRegister, Smi::FromInt(reset_value)); | 314 __ Move(kScratchRegister, Smi::FromInt(reset_value)); |
| 319 __ movq(FieldOperand(rbx, Cell::kValueOffset), kScratchRegister); | 315 __ movq(FieldOperand(rbx, Cell::kValueOffset), kScratchRegister); |
| 320 } | 316 } |
| 321 | 317 |
| 322 | 318 |
| 323 void FullCodeGenerator::EmitBackEdgeBookkeeping(IterationStatement* stmt, | 319 void FullCodeGenerator::EmitBackEdgeBookkeeping(IterationStatement* stmt, |
| 324 Label* back_edge_target) { | 320 Label* back_edge_target) { |
| 325 Comment cmnt(masm_, "[ Back edge bookkeeping"); | 321 Comment cmnt(masm_, "[ Back edge bookkeeping"); |
| 326 Label ok; | 322 Label ok; |
| 327 | 323 |
| 328 int weight = 1; | 324 ASSERT(back_edge_target->is_bound()); |
| 329 if (FLAG_weighted_back_edges) { | 325 int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target); |
| 330 ASSERT(back_edge_target->is_bound()); | 326 int weight = Min(kMaxBackEdgeWeight, |
| 331 int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target); | 327 Max(1, distance / kCodeSizeMultiplier)); |
| 332 weight = Min(kMaxBackEdgeWeight, | |
| 333 Max(1, distance / kCodeSizeMultiplier)); | |
| 334 } | |
| 335 EmitProfilingCounterDecrement(weight); | 328 EmitProfilingCounterDecrement(weight); |
| 336 __ j(positive, &ok, Label::kNear); | 329 __ j(positive, &ok, Label::kNear); |
| 337 __ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET); | 330 __ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET); |
| 338 | 331 |
| 339 // Record a mapping of this PC offset to the OSR id. This is used to find | 332 // Record a mapping of this PC offset to the OSR id. This is used to find |
| 340 // the AST id from the unoptimized code in order to use it as a key into | 333 // the AST id from the unoptimized code in order to use it as a key into |
| 341 // the deoptimization input data found in the optimized code. | 334 // the deoptimization input data found in the optimized code. |
| 342 RecordBackEdge(stmt->OsrEntryId()); | 335 RecordBackEdge(stmt->OsrEntryId()); |
| 343 | 336 |
| 344 EmitProfilingCounterReset(); | 337 EmitProfilingCounterReset(); |
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| 355 void FullCodeGenerator::EmitReturnSequence() { | 348 void FullCodeGenerator::EmitReturnSequence() { |
| 356 Comment cmnt(masm_, "[ Return sequence"); | 349 Comment cmnt(masm_, "[ Return sequence"); |
| 357 if (return_label_.is_bound()) { | 350 if (return_label_.is_bound()) { |
| 358 __ jmp(&return_label_); | 351 __ jmp(&return_label_); |
| 359 } else { | 352 } else { |
| 360 __ bind(&return_label_); | 353 __ bind(&return_label_); |
| 361 if (FLAG_trace) { | 354 if (FLAG_trace) { |
| 362 __ push(rax); | 355 __ push(rax); |
| 363 __ CallRuntime(Runtime::kTraceExit, 1); | 356 __ CallRuntime(Runtime::kTraceExit, 1); |
| 364 } | 357 } |
| 365 if (FLAG_interrupt_at_exit || FLAG_self_optimization) { | 358 // Pretend that the exit is a backwards jump to the entry. |
| 366 // Pretend that the exit is a backwards jump to the entry. | 359 int weight = 1; |
| 367 int weight = 1; | 360 if (info_->ShouldSelfOptimize()) { |
| 368 if (info_->ShouldSelfOptimize()) { | 361 weight = FLAG_interrupt_budget / FLAG_self_opt_count; |
| 369 weight = FLAG_interrupt_budget / FLAG_self_opt_count; | 362 } else { |
| 370 } else if (FLAG_weighted_back_edges) { | 363 int distance = masm_->pc_offset(); |
| 371 int distance = masm_->pc_offset(); | 364 weight = Min(kMaxBackEdgeWeight, |
| 372 weight = Min(kMaxBackEdgeWeight, | 365 Max(1, distance / kCodeSizeMultiplier)); |
| 373 Max(1, distance / kCodeSizeMultiplier)); | |
| 374 } | |
| 375 EmitProfilingCounterDecrement(weight); | |
| 376 Label ok; | |
| 377 __ j(positive, &ok, Label::kNear); | |
| 378 __ push(rax); | |
| 379 if (info_->ShouldSelfOptimize() && FLAG_direct_self_opt) { | |
| 380 __ push(Operand(rbp, JavaScriptFrameConstants::kFunctionOffset)); | |
| 381 __ CallRuntime(Runtime::kOptimizeFunctionOnNextCall, 1); | |
| 382 } else { | |
| 383 __ call(isolate()->builtins()->InterruptCheck(), | |
| 384 RelocInfo::CODE_TARGET); | |
| 385 } | |
| 386 __ pop(rax); | |
| 387 EmitProfilingCounterReset(); | |
| 388 __ bind(&ok); | |
| 389 } | 366 } |
| 367 EmitProfilingCounterDecrement(weight); |
| 368 Label ok; |
| 369 __ j(positive, &ok, Label::kNear); |
| 370 __ push(rax); |
| 371 __ call(isolate()->builtins()->InterruptCheck(), |
| 372 RelocInfo::CODE_TARGET); |
| 373 __ pop(rax); |
| 374 EmitProfilingCounterReset(); |
| 375 __ bind(&ok); |
| 390 #ifdef DEBUG | 376 #ifdef DEBUG |
| 391 // Add a label for checking the size of the code used for returning. | 377 // Add a label for checking the size of the code used for returning. |
| 392 Label check_exit_codesize; | 378 Label check_exit_codesize; |
| 393 masm_->bind(&check_exit_codesize); | 379 masm_->bind(&check_exit_codesize); |
| 394 #endif | 380 #endif |
| 395 CodeGenerator::RecordPositions(masm_, function()->end_position() - 1); | 381 CodeGenerator::RecordPositions(masm_, function()->end_position() - 1); |
| 396 __ RecordJSReturn(); | 382 __ RecordJSReturn(); |
| 397 // Do not use the leave instruction here because it is too short to | 383 // Do not use the leave instruction here because it is too short to |
| 398 // patch with the code required by the debugger. | 384 // patch with the code required by the debugger. |
| 399 __ movq(rsp, rbp); | 385 __ movq(rsp, rbp); |
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| 4906 | 4892 |
| 4907 ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(), | 4893 ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(), |
| 4908 Assembler::target_address_at(call_target_address)); | 4894 Assembler::target_address_at(call_target_address)); |
| 4909 return OSR_AFTER_STACK_CHECK; | 4895 return OSR_AFTER_STACK_CHECK; |
| 4910 } | 4896 } |
| 4911 | 4897 |
| 4912 | 4898 |
| 4913 } } // namespace v8::internal | 4899 } } // namespace v8::internal |
| 4914 | 4900 |
| 4915 #endif // V8_TARGET_ARCH_X64 | 4901 #endif // V8_TARGET_ARCH_X64 |
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