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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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| 3974   // After shadowing stops, the original targets are unshadowed and the | 3974   // After shadowing stops, the original targets are unshadowed and the | 
| 3975   // ShadowTargets represent the formerly shadowing targets. | 3975   // ShadowTargets represent the formerly shadowing targets. | 
| 3976   bool has_unlinks = false; | 3976   bool has_unlinks = false; | 
| 3977   for (int i = 0; i < shadows.length(); i++) { | 3977   for (int i = 0; i < shadows.length(); i++) { | 
| 3978     shadows[i]->StopShadowing(); | 3978     shadows[i]->StopShadowing(); | 
| 3979     has_unlinks = has_unlinks || shadows[i]->is_linked(); | 3979     has_unlinks = has_unlinks || shadows[i]->is_linked(); | 
| 3980   } | 3980   } | 
| 3981   function_return_is_shadowed_ = function_return_was_shadowed; | 3981   function_return_is_shadowed_ = function_return_was_shadowed; | 
| 3982 | 3982 | 
| 3983   // Get an external reference to the handler address. | 3983   // Get an external reference to the handler address. | 
| 3984   ExternalReference handler_address(Isolate::k_handler_address); | 3984   ExternalReference handler_address(Isolate::k_handler_address, isolate()); | 
| 3985 | 3985 | 
| 3986   // Make sure that there's nothing left on the stack above the | 3986   // Make sure that there's nothing left on the stack above the | 
| 3987   // handler structure. | 3987   // handler structure. | 
| 3988   if (FLAG_debug_code) { | 3988   if (FLAG_debug_code) { | 
| 3989     __ movq(kScratchRegister, handler_address); | 3989     __ movq(kScratchRegister, handler_address); | 
| 3990     __ cmpq(rsp, Operand(kScratchRegister, 0)); | 3990     __ cmpq(rsp, Operand(kScratchRegister, 0)); | 
| 3991     __ Assert(equal, "stack pointer should point to top handler"); | 3991     __ Assert(equal, "stack pointer should point to top handler"); | 
| 3992   } | 3992   } | 
| 3993 | 3993 | 
| 3994   // If we can fall off the end of the try block, unlink from try chain. | 3994   // If we can fall off the end of the try block, unlink from try chain. | 
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| 4103   // After shadowing stops, the original targets are unshadowed and the | 4103   // After shadowing stops, the original targets are unshadowed and the | 
| 4104   // ShadowTargets represent the formerly shadowing targets. | 4104   // ShadowTargets represent the formerly shadowing targets. | 
| 4105   int nof_unlinks = 0; | 4105   int nof_unlinks = 0; | 
| 4106   for (int i = 0; i < shadows.length(); i++) { | 4106   for (int i = 0; i < shadows.length(); i++) { | 
| 4107     shadows[i]->StopShadowing(); | 4107     shadows[i]->StopShadowing(); | 
| 4108     if (shadows[i]->is_linked()) nof_unlinks++; | 4108     if (shadows[i]->is_linked()) nof_unlinks++; | 
| 4109   } | 4109   } | 
| 4110   function_return_is_shadowed_ = function_return_was_shadowed; | 4110   function_return_is_shadowed_ = function_return_was_shadowed; | 
| 4111 | 4111 | 
| 4112   // Get an external reference to the handler address. | 4112   // Get an external reference to the handler address. | 
| 4113   ExternalReference handler_address(Isolate::k_handler_address); | 4113   ExternalReference handler_address(Isolate::k_handler_address, isolate()); | 
| 4114 | 4114 | 
| 4115   // If we can fall off the end of the try block, unlink from the try | 4115   // If we can fall off the end of the try block, unlink from the try | 
| 4116   // chain and set the state on the frame to FALLING. | 4116   // chain and set the state on the frame to FALLING. | 
| 4117   if (has_valid_frame()) { | 4117   if (has_valid_frame()) { | 
| 4118     // The next handler address is on top of the frame. | 4118     // The next handler address is on top of the frame. | 
| 4119     STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); | 4119     STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); | 
| 4120     __ movq(kScratchRegister, handler_address); | 4120     __ movq(kScratchRegister, handler_address); | 
| 4121     frame_->EmitPop(Operand(kScratchRegister, 0)); | 4121     frame_->EmitPop(Operand(kScratchRegister, 0)); | 
| 4122     frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); | 4122     frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1); | 
| 4123 | 4123 | 
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| 6432   __ bind(&slow_allocate_heapnumber); | 6432   __ bind(&slow_allocate_heapnumber); | 
| 6433   // Allocate a heap number. | 6433   // Allocate a heap number. | 
| 6434   __ CallRuntime(Runtime::kNumberAlloc, 0); | 6434   __ CallRuntime(Runtime::kNumberAlloc, 0); | 
| 6435   __ movq(rbx, rax); | 6435   __ movq(rbx, rax); | 
| 6436 | 6436 | 
| 6437   __ bind(&heapnumber_allocated); | 6437   __ bind(&heapnumber_allocated); | 
| 6438 | 6438 | 
| 6439   // Return a random uint32 number in rax. | 6439   // Return a random uint32 number in rax. | 
| 6440   // The fresh HeapNumber is in rbx, which is callee-save on both x64 ABIs. | 6440   // The fresh HeapNumber is in rbx, which is callee-save on both x64 ABIs. | 
| 6441   __ PrepareCallCFunction(0); | 6441   __ PrepareCallCFunction(0); | 
| 6442   __ CallCFunction(ExternalReference::random_uint32_function(), 0); | 6442   __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 0); | 
| 6443 | 6443 | 
| 6444   // Convert 32 random bits in rax to 0.(32 random bits) in a double | 6444   // Convert 32 random bits in rax to 0.(32 random bits) in a double | 
| 6445   // by computing: | 6445   // by computing: | 
| 6446   // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). | 6446   // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). | 
| 6447   __ movl(rcx, Immediate(0x49800000));  // 1.0 x 2^20 as single. | 6447   __ movl(rcx, Immediate(0x49800000));  // 1.0 x 2^20 as single. | 
| 6448   __ movd(xmm1, rcx); | 6448   __ movd(xmm1, rcx); | 
| 6449   __ movd(xmm0, rax); | 6449   __ movd(xmm0, rax); | 
| 6450   __ cvtss2sd(xmm1, xmm1); | 6450   __ cvtss2sd(xmm1, xmm1); | 
| 6451   __ xorpd(xmm0, xmm1); | 6451   __ xorpd(xmm0, xmm1); | 
| 6452   __ subsd(xmm0, xmm1); | 6452   __ subsd(xmm0, xmm1); | 
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| 8841 } | 8841 } | 
| 8842 | 8842 | 
| 8843 #endif | 8843 #endif | 
| 8844 | 8844 | 
| 8845 | 8845 | 
| 8846 #undef __ | 8846 #undef __ | 
| 8847 | 8847 | 
| 8848 } }  // namespace v8::internal | 8848 } }  // namespace v8::internal | 
| 8849 | 8849 | 
| 8850 #endif  // V8_TARGET_ARCH_X64 | 8850 #endif  // V8_TARGET_ARCH_X64 | 
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