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1 // Copyright 2008-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2008-2009 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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627 __ push(ebp); | 627 __ push(ebp); |
628 __ mov(ebp, esp); | 628 __ mov(ebp, esp); |
629 // Save callee-save registers. Order here should correspond to order of | 629 // Save callee-save registers. Order here should correspond to order of |
630 // kBackup_ebx etc. | 630 // kBackup_ebx etc. |
631 __ push(esi); | 631 __ push(esi); |
632 __ push(edi); | 632 __ push(edi); |
633 __ push(ebx); // Callee-save on MacOS. | 633 __ push(ebx); // Callee-save on MacOS. |
634 __ push(Immediate(0)); // Make room for "input start - 1" constant. | 634 __ push(Immediate(0)); // Make room for "input start - 1" constant. |
635 | 635 |
636 // Check if we have space on the stack for registers. | 636 // Check if we have space on the stack for registers. |
637 Label retry_stack_check; | |
638 Label stack_limit_hit; | 637 Label stack_limit_hit; |
639 Label stack_ok; | 638 Label stack_ok; |
640 | 639 |
641 __ bind(&retry_stack_check); | |
642 ExternalReference stack_guard_limit = | 640 ExternalReference stack_guard_limit = |
643 ExternalReference::address_of_stack_guard_limit(); | 641 ExternalReference::address_of_stack_guard_limit(); |
644 __ mov(ecx, esp); | 642 __ mov(ecx, esp); |
645 __ sub(ecx, Operand::StaticVariable(stack_guard_limit)); | 643 __ sub(ecx, Operand::StaticVariable(stack_guard_limit)); |
646 // Handle it if the stack pointer is already below the stack limit. | 644 // Handle it if the stack pointer is already below the stack limit. |
647 __ j(below_equal, &stack_limit_hit, not_taken); | 645 __ j(below_equal, &stack_limit_hit, not_taken); |
648 // Check if there is room for the variable number of registers above | 646 // Check if there is room for the variable number of registers above |
649 // the stack limit. | 647 // the stack limit. |
650 __ cmp(ecx, num_registers_ * kPointerSize); | 648 __ cmp(ecx, num_registers_ * kPointerSize); |
651 __ j(above_equal, &stack_ok, taken); | 649 __ j(above_equal, &stack_ok, taken); |
652 // Exit with OutOfMemory exception. There is not enough space on the stack | 650 // Exit with OutOfMemory exception. There is not enough space on the stack |
653 // for our working registers. | 651 // for our working registers. |
654 __ mov(eax, EXCEPTION); | 652 __ mov(eax, EXCEPTION); |
655 __ jmp(&exit_label_); | 653 __ jmp(&exit_label_); |
656 | 654 |
657 __ bind(&stack_limit_hit); | 655 __ bind(&stack_limit_hit); |
658 CallCheckStackGuardState(ebx); | 656 CallCheckStackGuardState(ebx); |
659 __ or_(eax, Operand(eax)); | 657 __ or_(eax, Operand(eax)); |
660 // If returned value is non-zero, we exit with the returned value as result. | 658 // If returned value is non-zero, we exit with the returned value as result. |
661 // Otherwise it was a preemption and we just check the limit again. | 659 __ j(not_zero, &exit_label_); |
662 __ j(equal, &retry_stack_check); | |
663 // Return value was non-zero. Exit with exception or retry. | |
664 __ jmp(&exit_label_); | |
665 | 660 |
666 __ bind(&stack_ok); | 661 __ bind(&stack_ok); |
667 | 662 |
668 // Allocate space on stack for registers. | 663 // Allocate space on stack for registers. |
669 __ sub(Operand(esp), Immediate(num_registers_ * kPointerSize)); | 664 __ sub(Operand(esp), Immediate(num_registers_ * kPointerSize)); |
670 // Load string length. | 665 // Load string length. |
671 __ mov(esi, Operand(ebp, kInputEnd)); | 666 __ mov(esi, Operand(ebp, kInputEnd)); |
672 // Load input position. | 667 // Load input position. |
673 __ mov(edi, Operand(ebp, kInputStart)); | 668 __ mov(edi, Operand(ebp, kInputStart)); |
674 // Set up edi to be negative offset from string end. | 669 // Set up edi to be negative offset from string end. |
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755 | 750 |
756 Label exit_with_exception; | 751 Label exit_with_exception; |
757 | 752 |
758 // Preempt-code | 753 // Preempt-code |
759 if (check_preempt_label_.is_linked()) { | 754 if (check_preempt_label_.is_linked()) { |
760 __ bind(&check_preempt_label_); | 755 __ bind(&check_preempt_label_); |
761 | 756 |
762 __ push(backtrack_stackpointer()); | 757 __ push(backtrack_stackpointer()); |
763 __ push(edi); | 758 __ push(edi); |
764 | 759 |
765 Label retry; | |
766 | |
767 __ bind(&retry); | |
768 CallCheckStackGuardState(ebx); | 760 CallCheckStackGuardState(ebx); |
769 __ or_(eax, Operand(eax)); | 761 __ or_(eax, Operand(eax)); |
770 // If returning non-zero, we should end execution with the given | 762 // If returning non-zero, we should end execution with the given |
771 // result as return value. | 763 // result as return value. |
772 __ j(not_zero, &exit_label_); | 764 __ j(not_zero, &exit_label_); |
773 // Check if we are still preempted. | |
774 ExternalReference stack_guard_limit = | |
775 ExternalReference::address_of_stack_guard_limit(); | |
776 __ cmp(esp, Operand::StaticVariable(stack_guard_limit)); | |
777 __ j(below_equal, &retry); | |
778 | 765 |
779 __ pop(edi); | 766 __ pop(edi); |
780 __ pop(backtrack_stackpointer()); | 767 __ pop(backtrack_stackpointer()); |
781 // String might have moved: Reload esi from frame. | 768 // String might have moved: Reload esi from frame. |
782 __ mov(esi, Operand(ebp, kInputEnd)); | 769 __ mov(esi, Operand(ebp, kInputEnd)); |
783 SafeReturn(); | 770 SafeReturn(); |
784 } | 771 } |
785 | 772 |
786 // Backtrack stack overflow code. | 773 // Backtrack stack overflow code. |
787 if (stack_overflow_label_.is_linked()) { | 774 if (stack_overflow_label_.is_linked()) { |
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1385 | 1372 |
1386 | 1373 |
1387 void RegExpMacroAssemblerIA32::LoadConstantBufferAddress(Register reg, | 1374 void RegExpMacroAssemblerIA32::LoadConstantBufferAddress(Register reg, |
1388 ArraySlice* buffer) { | 1375 ArraySlice* buffer) { |
1389 __ mov(reg, buffer->array()); | 1376 __ mov(reg, buffer->array()); |
1390 __ add(Operand(reg), Immediate(buffer->base_offset())); | 1377 __ add(Operand(reg), Immediate(buffer->base_offset())); |
1391 } | 1378 } |
1392 | 1379 |
1393 #undef __ | 1380 #undef __ |
1394 }} // namespace v8::internal | 1381 }} // namespace v8::internal |
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