Line data Source code
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
3 : // found in the LICENSE file.
4 :
5 : #if V8_TARGET_ARCH_X64
6 :
7 : #include "src/deoptimizer.h"
8 : #include "src/macro-assembler.h"
9 : #include "src/objects-inl.h"
10 : #include "src/register-configuration.h"
11 : #include "src/safepoint-table.h"
12 :
13 : namespace v8 {
14 : namespace internal {
15 :
16 : #define __ masm->
17 :
18 45129 : void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
19 : Isolate* isolate,
20 : DeoptimizeKind deopt_kind) {
21 : NoRootArrayScope no_root_array(masm);
22 :
23 : // Save all general purpose registers before messing with them.
24 : const int kNumberOfRegisters = Register::kNumRegisters;
25 :
26 : const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters;
27 45129 : __ subp(rsp, Immediate(kDoubleRegsSize));
28 :
29 3565181 : const RegisterConfiguration* config = RegisterConfiguration::Default();
30 1444126 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
31 : int code = config->GetAllocatableDoubleCode(i);
32 : XMMRegister xmm_reg = XMMRegister::from_code(code);
33 676934 : int offset = code * kDoubleSize;
34 1353869 : __ Movsd(Operand(rsp, offset), xmm_reg);
35 : }
36 :
37 : const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters;
38 45129 : __ subp(rsp, Immediate(kFloatRegsSize));
39 :
40 1444128 : for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
41 : int code = config->GetAllocatableFloatCode(i);
42 : XMMRegister xmm_reg = XMMRegister::from_code(code);
43 676935 : int offset = code * kFloatSize;
44 1353870 : __ Movss(Operand(rsp, offset), xmm_reg);
45 : }
46 :
47 : // We push all registers onto the stack, even though we do not need
48 : // to restore all later.
49 722064 : for (int i = 0; i < kNumberOfRegisters; i++) {
50 722064 : Register r = Register::from_code(i);
51 722064 : __ pushq(r);
52 : }
53 :
54 : const int kSavedRegistersAreaSize =
55 : kNumberOfRegisters * kRegisterSize + kDoubleRegsSize + kFloatRegsSize;
56 :
57 : __ Store(
58 : ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate),
59 45129 : rbp);
60 :
61 : // We use this to keep the value of the fifth argument temporarily.
62 : // Unfortunately we can't store it directly in r8 (used for passing
63 : // this on linux), since it is another parameter passing register on windows.
64 : Register arg5 = r11;
65 :
66 : // The bailout id is passed using r13 on the stack.
67 : __ movp(arg_reg_3, r13);
68 :
69 : // Get the address of the location in the code object
70 : // and compute the fp-to-sp delta in register arg5.
71 90258 : __ movp(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize));
72 90258 : __ leap(arg5, Operand(rsp, kSavedRegistersAreaSize + kPCOnStackSize));
73 :
74 45129 : __ subp(arg5, rbp);
75 : __ negp(arg5);
76 :
77 : // Allocate a new deoptimizer object.
78 45129 : __ PrepareCallCFunction(6);
79 : __ movp(rax, Immediate(0));
80 45129 : Label context_check;
81 90258 : __ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
82 45129 : __ JumpIfSmi(rdi, &context_check);
83 90258 : __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
84 45129 : __ bind(&context_check);
85 : __ movp(arg_reg_1, rax);
86 45127 : __ Set(arg_reg_2, static_cast<int>(deopt_kind));
87 : // Args 3 and 4 are already in the right registers.
88 :
89 : // On windows put the arguments on the stack (PrepareCallCFunction
90 : // has created space for this). On linux pass the arguments in r8 and r9.
91 : #ifdef _WIN64
92 : __ movq(Operand(rsp, 4 * kRegisterSize), arg5);
93 : __ LoadAddress(arg5, ExternalReference::isolate_address(isolate));
94 : __ movq(Operand(rsp, 5 * kRegisterSize), arg5);
95 : #else
96 : __ movp(r8, arg5);
97 45129 : __ LoadAddress(r9, ExternalReference::isolate_address(isolate));
98 : #endif
99 :
100 : {
101 : AllowExternalCallThatCantCauseGC scope(masm);
102 45129 : __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
103 : }
104 : // Preserve deoptimizer object in register rax and get the input
105 : // frame descriptor pointer.
106 90262 : __ movp(rbx, Operand(rax, Deoptimizer::input_offset()));
107 :
108 : // Fill in the input registers.
109 767184 : for (int i = kNumberOfRegisters -1; i >= 0; i--) {
110 722054 : int offset = (i * kRegisterSize) + FrameDescription::registers_offset();
111 722054 : __ PopQuad(Operand(rbx, offset));
112 : }
113 :
114 : // Fill in the float input registers.
115 : int float_regs_offset = FrameDescription::float_registers_offset();
116 722060 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
117 722061 : int src_offset = i * kFloatSize;
118 722061 : int dst_offset = i * kFloatSize + float_regs_offset;
119 1444123 : __ movl(rcx, Operand(rsp, src_offset));
120 1444122 : __ movl(Operand(rbx, dst_offset), rcx);
121 : }
122 45129 : __ addp(rsp, Immediate(kFloatRegsSize));
123 :
124 : // Fill in the double input registers.
125 : int double_regs_offset = FrameDescription::double_registers_offset();
126 767185 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
127 722056 : int dst_offset = i * kDoubleSize + double_regs_offset;
128 722056 : __ popq(Operand(rbx, dst_offset));
129 : }
130 :
131 : // Remove the return address from the stack.
132 45129 : __ addp(rsp, Immediate(kPCOnStackSize));
133 :
134 : // Compute a pointer to the unwinding limit in register rcx; that is
135 : // the first stack slot not part of the input frame.
136 90258 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
137 45129 : __ addp(rcx, rsp);
138 :
139 : // Unwind the stack down to - but not including - the unwinding
140 : // limit and copy the contents of the activation frame to the input
141 : // frame description.
142 90258 : __ leap(rdx, Operand(rbx, FrameDescription::frame_content_offset()));
143 45129 : Label pop_loop_header;
144 45129 : __ jmp(&pop_loop_header);
145 45129 : Label pop_loop;
146 45129 : __ bind(&pop_loop);
147 45129 : __ Pop(Operand(rdx, 0));
148 45129 : __ addp(rdx, Immediate(sizeof(intptr_t)));
149 45128 : __ bind(&pop_loop_header);
150 45129 : __ cmpp(rcx, rsp);
151 45129 : __ j(not_equal, &pop_loop);
152 :
153 : // Compute the output frame in the deoptimizer.
154 45128 : __ pushq(rax);
155 45129 : __ PrepareCallCFunction(2);
156 : __ movp(arg_reg_1, rax);
157 45127 : __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate));
158 : {
159 : AllowExternalCallThatCantCauseGC scope(masm);
160 45129 : __ CallCFunction(ExternalReference::compute_output_frames_function(), 2);
161 : }
162 45129 : __ popq(rax);
163 :
164 90256 : __ movp(rsp, Operand(rax, Deoptimizer::caller_frame_top_offset()));
165 :
166 : // Replace the current (input) frame with the output frames.
167 45129 : Label outer_push_loop, inner_push_loop,
168 45129 : outer_loop_header, inner_loop_header;
169 : // Outer loop state: rax = current FrameDescription**, rdx = one past the
170 : // last FrameDescription**.
171 90257 : __ movl(rdx, Operand(rax, Deoptimizer::output_count_offset()));
172 90257 : __ movp(rax, Operand(rax, Deoptimizer::output_offset()));
173 90257 : __ leap(rdx, Operand(rax, rdx, times_pointer_size, 0));
174 45128 : __ jmp(&outer_loop_header);
175 45127 : __ bind(&outer_push_loop);
176 : // Inner loop state: rbx = current FrameDescription*, rcx = loop index.
177 90256 : __ movp(rbx, Operand(rax, 0));
178 90257 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
179 45129 : __ jmp(&inner_loop_header);
180 45129 : __ bind(&inner_push_loop);
181 45129 : __ subp(rcx, Immediate(sizeof(intptr_t)));
182 45129 : __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset()));
183 45129 : __ bind(&inner_loop_header);
184 : __ testp(rcx, rcx);
185 45126 : __ j(not_zero, &inner_push_loop);
186 45127 : __ addp(rax, Immediate(kSystemPointerSize));
187 45129 : __ bind(&outer_loop_header);
188 45129 : __ cmpp(rax, rdx);
189 45128 : __ j(below, &outer_push_loop);
190 :
191 1444120 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
192 : int code = config->GetAllocatableDoubleCode(i);
193 : XMMRegister xmm_reg = XMMRegister::from_code(code);
194 676931 : int src_offset = code * kDoubleSize + double_regs_offset;
195 1353862 : __ Movsd(xmm_reg, Operand(rbx, src_offset));
196 : }
197 :
198 : // Push pc and continuation from the last output frame.
199 45129 : __ PushQuad(Operand(rbx, FrameDescription::pc_offset()));
200 45129 : __ PushQuad(Operand(rbx, FrameDescription::continuation_offset()));
201 :
202 : // Push the registers from the last output frame.
203 767186 : for (int i = 0; i < kNumberOfRegisters; i++) {
204 722059 : int offset = (i * kRegisterSize) + FrameDescription::registers_offset();
205 722059 : __ PushQuad(Operand(rbx, offset));
206 : }
207 :
208 : // Restore the registers from the stack.
209 722056 : for (int i = kNumberOfRegisters - 1; i >= 0 ; i--) {
210 : Register r = Register::from_code(i);
211 : // Do not restore rsp, simply pop the value into the next register
212 : // and overwrite this afterwards.
213 722054 : if (r == rsp) {
214 : DCHECK_GT(i, 0);
215 45129 : r = Register::from_code(i - 1);
216 : }
217 722054 : __ popq(r);
218 : }
219 :
220 : // Return to the continuation point.
221 45129 : __ ret(0);
222 45129 : }
223 :
224 282462 : bool Deoptimizer::PadTopOfStackRegister() { return false; }
225 :
226 146530 : void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
227 : if (kPCOnStackSize == 2 * kSystemPointerSize) {
228 : // Zero out the high-32 bit of PC for x32 port.
229 : SetFrameSlot(offset + kSystemPointerSize, 0);
230 : }
231 : SetFrameSlot(offset, value);
232 146530 : }
233 :
234 :
235 146530 : void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
236 : if (kFPOnStackSize == 2 * kSystemPointerSize) {
237 : // Zero out the high-32 bit of FP for x32 port.
238 : SetFrameSlot(offset + kSystemPointerSize, 0);
239 : }
240 : SetFrameSlot(offset, value);
241 146530 : }
242 :
243 :
244 0 : void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
245 : // No embedded constant pool support.
246 0 : UNREACHABLE();
247 : }
248 :
249 :
250 : #undef __
251 :
252 :
253 : } // namespace internal
254 183867 : } // namespace v8
255 :
256 : #endif // V8_TARGET_ARCH_X64
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