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/objects-inl.h"
9 : #include "src/register-configuration.h"
10 : #include "src/safepoint-table.h"
11 :
12 : namespace v8 {
13 : namespace internal {
14 :
15 :
16 : const int Deoptimizer::table_entry_size_ = 10;
17 :
18 : #define __ masm()->
19 :
20 8724064 : void Deoptimizer::TableEntryGenerator::Generate() {
21 38432 : GeneratePrologue();
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 38432 : __ subp(rsp, Immediate(kDoubleRegsSize));
28 :
29 3036128 : const RegisterConfiguration* config = RegisterConfiguration::Default();
30 1229824 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
31 : int code = config->GetAllocatableDoubleCode(i);
32 576480 : XMMRegister xmm_reg = XMMRegister::from_code(code);
33 576480 : int offset = code * kDoubleSize;
34 1152960 : __ Movsd(Operand(rsp, offset), xmm_reg);
35 : }
36 :
37 : const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters;
38 38432 : __ subp(rsp, Immediate(kFloatRegsSize));
39 :
40 1229824 : for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
41 : int code = config->GetAllocatableFloatCode(i);
42 576480 : XMMRegister xmm_reg = XMMRegister::from_code(code);
43 576480 : int offset = code * kFloatSize;
44 1152960 : __ 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 614912 : for (int i = 0; i < kNumberOfRegisters; i++) {
50 614912 : Register r = Register::from_code(i);
51 614912 : __ pushq(r);
52 : }
53 :
54 : const int kSavedRegistersAreaSize =
55 : kNumberOfRegisters * kRegisterSize + kDoubleRegsSize + kFloatRegsSize;
56 :
57 : __ Store(ExternalReference(IsolateAddressId::kCEntryFPAddress, isolate()),
58 76864 : rbp);
59 :
60 : // We use this to keep the value of the fifth argument temporarily.
61 : // Unfortunately we can't store it directly in r8 (used for passing
62 : // this on linux), since it is another parameter passing register on windows.
63 : Register arg5 = r11;
64 :
65 : // Get the bailout id from the stack.
66 115296 : __ movp(arg_reg_3, Operand(rsp, kSavedRegistersAreaSize));
67 :
68 : // Get the address of the location in the code object
69 : // and compute the fp-to-sp delta in register arg5.
70 115296 : __ movp(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize));
71 : __ leap(arg5, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize +
72 115296 : kPCOnStackSize));
73 :
74 38432 : __ subp(arg5, rbp);
75 38432 : __ negp(arg5);
76 :
77 : // Allocate a new deoptimizer object.
78 38432 : __ PrepareCallCFunction(6);
79 38432 : __ movp(rax, Immediate(0));
80 : Label context_check;
81 115296 : __ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
82 38432 : __ JumpIfSmi(rdi, &context_check);
83 115296 : __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
84 38432 : __ bind(&context_check);
85 38432 : __ movp(arg_reg_1, rax);
86 76864 : __ Set(arg_reg_2, type());
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 38432 : __ movp(r8, arg5);
97 76864 : __ LoadAddress(r9, ExternalReference::isolate_address(isolate()));
98 : #endif
99 :
100 : { AllowExternalCallThatCantCauseGC scope(masm());
101 76864 : __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
102 : }
103 : // Preserve deoptimizer object in register rax and get the input
104 : // frame descriptor pointer.
105 115296 : __ movp(rbx, Operand(rax, Deoptimizer::input_offset()));
106 :
107 : // Fill in the input registers.
108 653344 : for (int i = kNumberOfRegisters -1; i >= 0; i--) {
109 614912 : int offset = (i * kPointerSize) + FrameDescription::registers_offset();
110 1229824 : __ PopQuad(Operand(rbx, offset));
111 : }
112 :
113 : // Fill in the float input registers.
114 : int float_regs_offset = FrameDescription::float_registers_offset();
115 614912 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
116 614912 : int src_offset = i * kFloatSize;
117 614912 : int dst_offset = i * kFloatSize + float_regs_offset;
118 1844736 : __ movl(rcx, Operand(rsp, src_offset));
119 1844736 : __ movl(Operand(rbx, dst_offset), rcx);
120 : }
121 38432 : __ addp(rsp, Immediate(kFloatRegsSize));
122 :
123 : // Fill in the double input registers.
124 : int double_regs_offset = FrameDescription::double_registers_offset();
125 653344 : for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
126 614912 : int dst_offset = i * kDoubleSize + double_regs_offset;
127 1229824 : __ popq(Operand(rbx, dst_offset));
128 : }
129 :
130 : // Remove the bailout id and return address from the stack.
131 38432 : __ addp(rsp, Immediate(1 * kRegisterSize + kPCOnStackSize));
132 :
133 : // Compute a pointer to the unwinding limit in register rcx; that is
134 : // the first stack slot not part of the input frame.
135 115296 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
136 38432 : __ addp(rcx, rsp);
137 :
138 : // Unwind the stack down to - but not including - the unwinding
139 : // limit and copy the contents of the activation frame to the input
140 : // frame description.
141 115296 : __ leap(rdx, Operand(rbx, FrameDescription::frame_content_offset()));
142 : Label pop_loop_header;
143 38432 : __ jmp(&pop_loop_header);
144 : Label pop_loop;
145 38432 : __ bind(&pop_loop);
146 76864 : __ Pop(Operand(rdx, 0));
147 38432 : __ addp(rdx, Immediate(sizeof(intptr_t)));
148 38432 : __ bind(&pop_loop_header);
149 38432 : __ cmpp(rcx, rsp);
150 38432 : __ j(not_equal, &pop_loop);
151 :
152 : // Compute the output frame in the deoptimizer.
153 38432 : __ pushq(rax);
154 38432 : __ PrepareCallCFunction(2);
155 38432 : __ movp(arg_reg_1, rax);
156 76864 : __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate()));
157 : {
158 : AllowExternalCallThatCantCauseGC scope(masm());
159 : __ CallCFunction(
160 76864 : ExternalReference::compute_output_frames_function(isolate()), 2);
161 : }
162 38432 : __ popq(rax);
163 :
164 115296 : __ movp(rsp, Operand(rax, Deoptimizer::caller_frame_top_offset()));
165 :
166 : // Replace the current (input) frame with the output frames.
167 : Label outer_push_loop, inner_push_loop,
168 : outer_loop_header, inner_loop_header;
169 : // Outer loop state: rax = current FrameDescription**, rdx = one past the
170 : // last FrameDescription**.
171 115296 : __ movl(rdx, Operand(rax, Deoptimizer::output_count_offset()));
172 115296 : __ movp(rax, Operand(rax, Deoptimizer::output_offset()));
173 115296 : __ leap(rdx, Operand(rax, rdx, times_pointer_size, 0));
174 38432 : __ jmp(&outer_loop_header);
175 38432 : __ bind(&outer_push_loop);
176 : // Inner loop state: rbx = current FrameDescription*, rcx = loop index.
177 115296 : __ movp(rbx, Operand(rax, 0));
178 115296 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
179 38432 : __ jmp(&inner_loop_header);
180 38432 : __ bind(&inner_push_loop);
181 38432 : __ subp(rcx, Immediate(sizeof(intptr_t)));
182 76864 : __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset()));
183 38432 : __ bind(&inner_loop_header);
184 38432 : __ testp(rcx, rcx);
185 38432 : __ j(not_zero, &inner_push_loop);
186 38432 : __ addp(rax, Immediate(kPointerSize));
187 38432 : __ bind(&outer_loop_header);
188 38432 : __ cmpp(rax, rdx);
189 38432 : __ j(below, &outer_push_loop);
190 :
191 1229824 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
192 : int code = config->GetAllocatableDoubleCode(i);
193 576480 : XMMRegister xmm_reg = XMMRegister::from_code(code);
194 576480 : int src_offset = code * kDoubleSize + double_regs_offset;
195 1152960 : __ Movsd(xmm_reg, Operand(rbx, src_offset));
196 : }
197 :
198 : // Push pc and continuation from the last output frame.
199 76864 : __ PushQuad(Operand(rbx, FrameDescription::pc_offset()));
200 76864 : __ PushQuad(Operand(rbx, FrameDescription::continuation_offset()));
201 :
202 : // Push the registers from the last output frame.
203 653344 : for (int i = 0; i < kNumberOfRegisters; i++) {
204 614912 : int offset = (i * kPointerSize) + FrameDescription::registers_offset();
205 1229824 : __ PushQuad(Operand(rbx, offset));
206 : }
207 :
208 : // Restore the registers from the stack.
209 614912 : 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 614912 : if (r == rsp) {
214 : DCHECK_GT(i, 0);
215 38432 : r = Register::from_code(i - 1);
216 : }
217 614912 : __ popq(r);
218 : }
219 :
220 : // Set up the roots register.
221 38432 : __ InitializeRootRegister();
222 :
223 : // Return to the continuation point.
224 38432 : __ ret(0);
225 38432 : }
226 :
227 :
228 1798919514 : void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
229 : // Create a sequence of deoptimization entries.
230 : Label done;
231 1199280370 : for (int i = 0; i < count(); i++) {
232 : int start = masm()->pc_offset();
233 : USE(start);
234 599601753 : __ pushq_imm32(i);
235 599600455 : __ jmp(&done);
236 : DCHECK(masm()->pc_offset() - start == table_entry_size_);
237 : }
238 38432 : __ bind(&done);
239 38432 : }
240 :
241 293646 : bool Deoptimizer::PadTopOfStackRegister() { return false; }
242 :
243 155866 : void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
244 : if (kPCOnStackSize == 2 * kPointerSize) {
245 : // Zero out the high-32 bit of PC for x32 port.
246 : SetFrameSlot(offset + kPointerSize, 0);
247 : }
248 : SetFrameSlot(offset, value);
249 155866 : }
250 :
251 :
252 155866 : void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
253 : if (kFPOnStackSize == 2 * kPointerSize) {
254 : // Zero out the high-32 bit of FP for x32 port.
255 : SetFrameSlot(offset + kPointerSize, 0);
256 : }
257 : SetFrameSlot(offset, value);
258 155866 : }
259 :
260 :
261 0 : void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
262 : // No embedded constant pool support.
263 0 : UNREACHABLE();
264 : }
265 :
266 :
267 : #undef __
268 :
269 :
270 : } // namespace internal
271 : } // namespace v8
272 :
273 : #endif // V8_TARGET_ARCH_X64
|
