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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 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_X64 | 7 #if V8_TARGET_ARCH_X64 |
8 | 8 |
9 #include "src/code-stubs.h" | 9 #include "src/code-stubs.h" |
10 #include "src/codegen.h" | 10 #include "src/codegen.h" |
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71 } | 71 } |
72 | 72 |
73 MacroAssembler* masm_; | 73 MacroAssembler* masm_; |
74 Label patch_site_; | 74 Label patch_site_; |
75 #ifdef DEBUG | 75 #ifdef DEBUG |
76 bool info_emitted_; | 76 bool info_emitted_; |
77 #endif | 77 #endif |
78 }; | 78 }; |
79 | 79 |
80 | 80 |
81 static void EmitStackCheck(MacroAssembler* masm_, | |
82 int pointers = 0, | |
83 Register scratch = rsp) { | |
84 Isolate* isolate = masm_->isolate(); | |
85 Label ok; | |
86 ASSERT(scratch.is(rsp) == (pointers == 0)); | |
87 Heap::RootListIndex index; | |
88 if (pointers != 0) { | |
89 __ movp(scratch, rsp); | |
90 __ subp(scratch, Immediate(pointers * kPointerSize)); | |
91 index = Heap::kRealStackLimitRootIndex; | |
92 } else { | |
93 index = Heap::kStackLimitRootIndex; | |
94 } | |
95 __ CompareRoot(scratch, index); | |
96 __ j(above_equal, &ok, Label::kNear); | |
97 __ call(isolate->builtins()->StackCheck(), RelocInfo::CODE_TARGET); | |
98 __ bind(&ok); | |
99 } | |
100 | |
101 | |
102 // Generate code for a JS function. On entry to the function the receiver | 81 // Generate code for a JS function. On entry to the function the receiver |
103 // and arguments have been pushed on the stack left to right, with the | 82 // and arguments have been pushed on the stack left to right, with the |
104 // return address on top of them. The actual argument count matches the | 83 // return address on top of them. The actual argument count matches the |
105 // formal parameter count expected by the function. | 84 // formal parameter count expected by the function. |
106 // | 85 // |
107 // The live registers are: | 86 // The live registers are: |
108 // o rdi: the JS function object being called (i.e. ourselves) | 87 // o rdi: the JS function object being called (i.e. ourselves) |
109 // o rsi: our context | 88 // o rsi: our context |
110 // o rbp: our caller's frame pointer | 89 // o rbp: our caller's frame pointer |
111 // o rsp: stack pointer (pointing to return address) | 90 // o rsp: stack pointer (pointing to return address) |
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161 info->AddNoFrameRange(0, masm_->pc_offset()); | 140 info->AddNoFrameRange(0, masm_->pc_offset()); |
162 | 141 |
163 { Comment cmnt(masm_, "[ Allocate locals"); | 142 { Comment cmnt(masm_, "[ Allocate locals"); |
164 int locals_count = info->scope()->num_stack_slots(); | 143 int locals_count = info->scope()->num_stack_slots(); |
165 // Generators allocate locals, if any, in context slots. | 144 // Generators allocate locals, if any, in context slots. |
166 ASSERT(!info->function()->is_generator() || locals_count == 0); | 145 ASSERT(!info->function()->is_generator() || locals_count == 0); |
167 if (locals_count == 1) { | 146 if (locals_count == 1) { |
168 __ PushRoot(Heap::kUndefinedValueRootIndex); | 147 __ PushRoot(Heap::kUndefinedValueRootIndex); |
169 } else if (locals_count > 1) { | 148 } else if (locals_count > 1) { |
170 if (locals_count >= 128) { | 149 if (locals_count >= 128) { |
171 EmitStackCheck(masm_, locals_count, rcx); | 150 Label ok; |
| 151 __ movp(rcx, rsp); |
| 152 __ subp(rcx, Immediate(locals_count * kPointerSize)); |
| 153 __ CompareRoot(rcx, Heap::kRealStackLimitRootIndex); |
| 154 __ j(above_equal, &ok, Label::kNear); |
| 155 __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION); |
| 156 __ bind(&ok); |
172 } | 157 } |
173 __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex); | 158 __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex); |
174 const int kMaxPushes = 32; | 159 const int kMaxPushes = 32; |
175 if (locals_count >= kMaxPushes) { | 160 if (locals_count >= kMaxPushes) { |
176 int loop_iterations = locals_count / kMaxPushes; | 161 int loop_iterations = locals_count / kMaxPushes; |
177 __ movp(rcx, Immediate(loop_iterations)); | 162 __ movp(rcx, Immediate(loop_iterations)); |
178 Label loop_header; | 163 Label loop_header; |
179 __ bind(&loop_header); | 164 __ bind(&loop_header); |
180 // Do pushes. | 165 // Do pushes. |
181 for (int i = 0; i < kMaxPushes; i++) { | 166 for (int i = 0; i < kMaxPushes; i++) { |
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302 ASSERT(function->proxy()->var()->mode() == CONST || | 287 ASSERT(function->proxy()->var()->mode() == CONST || |
303 function->proxy()->var()->mode() == CONST_LEGACY); | 288 function->proxy()->var()->mode() == CONST_LEGACY); |
304 ASSERT(function->proxy()->var()->location() != Variable::UNALLOCATED); | 289 ASSERT(function->proxy()->var()->location() != Variable::UNALLOCATED); |
305 VisitVariableDeclaration(function); | 290 VisitVariableDeclaration(function); |
306 } | 291 } |
307 VisitDeclarations(scope()->declarations()); | 292 VisitDeclarations(scope()->declarations()); |
308 } | 293 } |
309 | 294 |
310 { Comment cmnt(masm_, "[ Stack check"); | 295 { Comment cmnt(masm_, "[ Stack check"); |
311 PrepareForBailoutForId(BailoutId::Declarations(), NO_REGISTERS); | 296 PrepareForBailoutForId(BailoutId::Declarations(), NO_REGISTERS); |
312 EmitStackCheck(masm_); | 297 Label ok; |
| 298 __ CompareRoot(rsp, Heap::kStackLimitRootIndex); |
| 299 __ j(above_equal, &ok, Label::kNear); |
| 300 __ call(isolate()->builtins()->StackCheck(), RelocInfo::CODE_TARGET); |
| 301 __ bind(&ok); |
313 } | 302 } |
314 | 303 |
315 { Comment cmnt(masm_, "[ Body"); | 304 { Comment cmnt(masm_, "[ Body"); |
316 ASSERT(loop_depth() == 0); | 305 ASSERT(loop_depth() == 0); |
317 VisitStatements(function()->body()); | 306 VisitStatements(function()->body()); |
318 ASSERT(loop_depth() == 0); | 307 ASSERT(loop_depth() == 0); |
319 } | 308 } |
320 } | 309 } |
321 | 310 |
322 // Always emit a 'return undefined' in case control fell off the end of | 311 // Always emit a 'return undefined' in case control fell off the end of |
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4803 ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(), | 4792 ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(), |
4804 Assembler::target_address_at(call_target_address, | 4793 Assembler::target_address_at(call_target_address, |
4805 unoptimized_code)); | 4794 unoptimized_code)); |
4806 return OSR_AFTER_STACK_CHECK; | 4795 return OSR_AFTER_STACK_CHECK; |
4807 } | 4796 } |
4808 | 4797 |
4809 | 4798 |
4810 } } // namespace v8::internal | 4799 } } // namespace v8::internal |
4811 | 4800 |
4812 #endif // V8_TARGET_ARCH_X64 | 4801 #endif // V8_TARGET_ARCH_X64 |
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