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 44763 : 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 44763 : __ subq(rsp, Immediate(kDoubleRegsSize));
28 :
29 44763 : const RegisterConfiguration* config = RegisterConfiguration::Default();
30 1387653 : 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 671445 : int offset = code * kDoubleSize;
34 1342890 : __ Movsd(Operand(rsp, offset), xmm_reg);
35 : }
36 :
37 : const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters;
38 : __ subq(rsp, Immediate(kFloatRegsSize));
39 :
40 1387653 : 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 671445 : int offset = code * kFloatSize;
44 1342890 : __ 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 1477179 : for (int i = 0; i < kNumberOfRegisters; i++) {
50 716208 : Register r = Register::from_code(i);
51 716208 : __ pushq(r);
52 : }
53 :
54 : const int kSavedRegistersAreaSize = kNumberOfRegisters * kSystemPointerSize +
55 : kDoubleRegsSize + kFloatRegsSize;
56 :
57 44763 : __ Store(
58 : ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate),
59 44763 : 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 : __ movq(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 89526 : __ movq(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize));
72 89526 : __ leaq(arg5, Operand(rsp, kSavedRegistersAreaSize + kPCOnStackSize));
73 :
74 : __ subq(arg5, rbp);
75 : __ negq(arg5);
76 :
77 : // Allocate a new deoptimizer object.
78 44763 : __ PrepareCallCFunction(6);
79 : __ movq(rax, Immediate(0));
80 44763 : Label context_check;
81 89526 : __ movq(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
82 44763 : __ JumpIfSmi(rdi, &context_check);
83 89526 : __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
84 44763 : __ bind(&context_check);
85 : __ movq(arg_reg_1, rax);
86 44763 : __ 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 * kSystemPointerSize), arg5);
93 : __ LoadAddress(arg5, ExternalReference::isolate_address(isolate));
94 : __ movq(Operand(rsp, 5 * kSystemPointerSize), arg5);
95 : #else
96 : __ movq(r8, arg5);
97 44763 : __ LoadAddress(r9, ExternalReference::isolate_address(isolate));
98 : #endif
99 :
100 : {
101 : AllowExternalCallThatCantCauseGC scope(masm);
102 44763 : __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
103 : }
104 : // Preserve deoptimizer object in register rax and get the input
105 : // frame descriptor pointer.
106 89526 : __ movq(rbx, Operand(rax, Deoptimizer::input_offset()));
107 :
108 : // Fill in the input registers.
109 1477179 : for (int i = kNumberOfRegisters -1; i >= 0; i--) {
110 : int offset =
111 716208 : (i * kSystemPointerSize) + FrameDescription::registers_offset();
112 716208 : __ PopQuad(Operand(rbx, offset));
113 : }
114 :
115 : // Fill in the float input registers.
116 : int float_regs_offset = FrameDescription::float_registers_offset();
117 1477179 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
118 716208 : int src_offset = i * kFloatSize;
119 716208 : int dst_offset = i * kFloatSize + float_regs_offset;
120 1432416 : __ movl(rcx, Operand(rsp, src_offset));
121 1432416 : __ movl(Operand(rbx, dst_offset), rcx);
122 : }
123 : __ addq(rsp, Immediate(kFloatRegsSize));
124 :
125 : // Fill in the double input registers.
126 : int double_regs_offset = FrameDescription::double_registers_offset();
127 1477179 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
128 716208 : int dst_offset = i * kDoubleSize + double_regs_offset;
129 716208 : __ popq(Operand(rbx, dst_offset));
130 : }
131 :
132 : // Remove the return address from the stack.
133 : __ addq(rsp, Immediate(kPCOnStackSize));
134 :
135 : // Compute a pointer to the unwinding limit in register rcx; that is
136 : // the first stack slot not part of the input frame.
137 89526 : __ movq(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
138 : __ addq(rcx, rsp);
139 :
140 : // Unwind the stack down to - but not including - the unwinding
141 : // limit and copy the contents of the activation frame to the input
142 : // frame description.
143 89526 : __ leaq(rdx, Operand(rbx, FrameDescription::frame_content_offset()));
144 44763 : Label pop_loop_header;
145 44763 : __ jmp(&pop_loop_header);
146 44763 : Label pop_loop;
147 44763 : __ bind(&pop_loop);
148 44763 : __ Pop(Operand(rdx, 0));
149 : __ addq(rdx, Immediate(sizeof(intptr_t)));
150 44763 : __ bind(&pop_loop_header);
151 : __ cmpq(rcx, rsp);
152 44763 : __ j(not_equal, &pop_loop);
153 :
154 : // Compute the output frame in the deoptimizer.
155 44763 : __ pushq(rax);
156 44763 : __ PrepareCallCFunction(2);
157 : __ movq(arg_reg_1, rax);
158 44763 : __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate));
159 : {
160 : AllowExternalCallThatCantCauseGC scope(masm);
161 44763 : __ CallCFunction(ExternalReference::compute_output_frames_function(), 2);
162 : }
163 44763 : __ popq(rax);
164 :
165 89526 : __ movq(rsp, Operand(rax, Deoptimizer::caller_frame_top_offset()));
166 :
167 : // Replace the current (input) frame with the output frames.
168 44763 : Label outer_push_loop, inner_push_loop,
169 44763 : outer_loop_header, inner_loop_header;
170 : // Outer loop state: rax = current FrameDescription**, rdx = one past the
171 : // last FrameDescription**.
172 89526 : __ movl(rdx, Operand(rax, Deoptimizer::output_count_offset()));
173 89526 : __ movq(rax, Operand(rax, Deoptimizer::output_offset()));
174 89526 : __ leaq(rdx, Operand(rax, rdx, times_system_pointer_size, 0));
175 44763 : __ jmp(&outer_loop_header);
176 44763 : __ bind(&outer_push_loop);
177 : // Inner loop state: rbx = current FrameDescription*, rcx = loop index.
178 89526 : __ movq(rbx, Operand(rax, 0));
179 89526 : __ movq(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
180 44763 : __ jmp(&inner_loop_header);
181 44763 : __ bind(&inner_push_loop);
182 : __ subq(rcx, Immediate(sizeof(intptr_t)));
183 44763 : __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset()));
184 44763 : __ bind(&inner_loop_header);
185 : __ testq(rcx, rcx);
186 44763 : __ j(not_zero, &inner_push_loop);
187 : __ addq(rax, Immediate(kSystemPointerSize));
188 44763 : __ bind(&outer_loop_header);
189 : __ cmpq(rax, rdx);
190 44763 : __ j(below, &outer_push_loop);
191 :
192 1387653 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
193 : int code = config->GetAllocatableDoubleCode(i);
194 : XMMRegister xmm_reg = XMMRegister::from_code(code);
195 671445 : int src_offset = code * kDoubleSize + double_regs_offset;
196 1342890 : __ Movsd(xmm_reg, Operand(rbx, src_offset));
197 : }
198 :
199 : // Push pc and continuation from the last output frame.
200 44763 : __ PushQuad(Operand(rbx, FrameDescription::pc_offset()));
201 44763 : __ PushQuad(Operand(rbx, FrameDescription::continuation_offset()));
202 :
203 : // Push the registers from the last output frame.
204 1477179 : for (int i = 0; i < kNumberOfRegisters; i++) {
205 : int offset =
206 716208 : (i * kSystemPointerSize) + FrameDescription::registers_offset();
207 716208 : __ PushQuad(Operand(rbx, offset));
208 : }
209 :
210 : // Restore the registers from the stack.
211 1477179 : for (int i = kNumberOfRegisters - 1; i >= 0 ; i--) {
212 : Register r = Register::from_code(i);
213 : // Do not restore rsp, simply pop the value into the next register
214 : // and overwrite this afterwards.
215 716208 : if (r == rsp) {
216 : DCHECK_GT(i, 0);
217 44763 : r = Register::from_code(i - 1);
218 : }
219 716208 : __ popq(r);
220 : }
221 :
222 : // Return to the continuation point.
223 44763 : __ ret(0);
224 44763 : }
225 :
226 106160 : bool Deoptimizer::PadTopOfStackRegister() { return false; }
227 :
228 58275 : void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
229 : if (kPCOnStackSize == 2 * kSystemPointerSize) {
230 : // Zero out the high-32 bit of PC for x32 port.
231 : SetFrameSlot(offset + kSystemPointerSize, 0);
232 : }
233 : SetFrameSlot(offset, value);
234 58275 : }
235 :
236 :
237 58275 : void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
238 : if (kFPOnStackSize == 2 * kSystemPointerSize) {
239 : // Zero out the high-32 bit of FP for x32 port.
240 : SetFrameSlot(offset + kSystemPointerSize, 0);
241 : }
242 : SetFrameSlot(offset, value);
243 58275 : }
244 :
245 :
246 0 : void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
247 : // No embedded constant pool support.
248 0 : UNREACHABLE();
249 : }
250 :
251 :
252 : #undef __
253 :
254 :
255 : } // namespace internal
256 121996 : } // namespace v8
257 :
258 : #endif // V8_TARGET_ARCH_X64
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