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/codegen.h"
8 : #include "src/deoptimizer.h"
9 : #include "src/full-codegen/full-codegen.h"
10 : #include "src/objects-inl.h"
11 : #include "src/register-configuration.h"
12 : #include "src/safepoint-table.h"
13 :
14 : namespace v8 {
15 : namespace internal {
16 :
17 :
18 : const int Deoptimizer::table_entry_size_ = 10;
19 :
20 :
21 5493794 : int Deoptimizer::patch_size() {
22 5493794 : return Assembler::kCallSequenceLength;
23 : }
24 :
25 :
26 391814 : void Deoptimizer::EnsureRelocSpaceForLazyDeoptimization(Handle<Code> code) {
27 : // Empty because there is no need for relocation information for the code
28 : // patching in Deoptimizer::PatchCodeForDeoptimization below.
29 391814 : }
30 :
31 :
32 422165 : void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
33 : // Invalidate the relocation information, as it will become invalid by the
34 : // code patching below, and is not needed any more.
35 422165 : code->InvalidateRelocation();
36 :
37 422165 : if (FLAG_zap_code_space) {
38 : // Fail hard and early if we enter this code object again.
39 0 : byte* pointer = code->FindCodeAgeSequence();
40 0 : if (pointer != NULL) {
41 0 : pointer += kNoCodeAgeSequenceLength;
42 : } else {
43 0 : pointer = code->instruction_start();
44 : }
45 0 : CodePatcher patcher(isolate, pointer, 1);
46 0 : patcher.masm()->int3();
47 :
48 : DeoptimizationInputData* data =
49 : DeoptimizationInputData::cast(code->deoptimization_data());
50 : int osr_offset = data->OsrPcOffset()->value();
51 0 : if (osr_offset > 0) {
52 0 : CodePatcher osr_patcher(isolate, code->instruction_start() + osr_offset,
53 0 : 1);
54 0 : osr_patcher.masm()->int3();
55 0 : }
56 : }
57 :
58 : // For each LLazyBailout instruction insert a absolute call to the
59 : // corresponding deoptimization entry, or a short call to an absolute
60 : // jump if space is short. The absolute jumps are put in a table just
61 : // before the safepoint table (space was allocated there when the Code
62 : // object was created, if necessary).
63 :
64 422165 : Address instruction_start = code->instruction_start();
65 : #ifdef DEBUG
66 : Address prev_call_address = NULL;
67 : #endif
68 : DeoptimizationInputData* deopt_data =
69 : DeoptimizationInputData::cast(code->deoptimization_data());
70 : deopt_data->SetSharedFunctionInfo(Smi::kZero);
71 : // For each LLazyBailout instruction insert a call to the corresponding
72 : // deoptimization entry.
73 10071404 : for (int i = 0; i < deopt_data->DeoptCount(); i++) {
74 10925749 : if (deopt_data->Pc(i)->value() == -1) continue;
75 : // Position where Call will be patched in.
76 5829724 : Address call_address = instruction_start + deopt_data->Pc(i)->value();
77 : // There is room enough to write a long call instruction because we pad
78 : // LLazyBailout instructions with nops if necessary.
79 2914862 : CodePatcher patcher(isolate, call_address, Assembler::kCallSequenceLength);
80 : patcher.masm()->Call(GetDeoptimizationEntry(isolate, i, LAZY),
81 2914862 : Assembler::RelocInfoNone());
82 : DCHECK(prev_call_address == NULL ||
83 : call_address >= prev_call_address + patch_size());
84 : DCHECK(call_address + patch_size() <= code->instruction_end());
85 : #ifdef DEBUG
86 : prev_call_address = call_address;
87 : #endif
88 2914862 : }
89 422165 : }
90 :
91 :
92 26647 : void Deoptimizer::SetPlatformCompiledStubRegisters(
93 26647 : FrameDescription* output_frame, CodeStubDescriptor* descriptor) {
94 : intptr_t handler =
95 26647 : reinterpret_cast<intptr_t>(descriptor->deoptimization_handler());
96 : int params = descriptor->GetHandlerParameterCount();
97 26647 : output_frame->SetRegister(rax.code(), params);
98 : output_frame->SetRegister(rbx.code(), handler);
99 26647 : }
100 :
101 :
102 26647 : void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
103 452999 : for (int i = 0; i < XMMRegister::kMaxNumRegisters; ++i) {
104 426352 : Float64 double_value = input_->GetDoubleRegister(i);
105 : output_frame->SetDoubleRegister(i, double_value);
106 : }
107 26647 : }
108 :
109 : #define __ masm()->
110 :
111 19419900 : void Deoptimizer::TableEntryGenerator::Generate() {
112 85175 : GeneratePrologue();
113 :
114 : // Save all general purpose registers before messing with them.
115 : const int kNumberOfRegisters = Register::kNumRegisters;
116 :
117 : const int kDoubleRegsSize = kDoubleSize * XMMRegister::kMaxNumRegisters;
118 85175 : __ subp(rsp, Immediate(kDoubleRegsSize));
119 :
120 6728825 : const RegisterConfiguration* config = RegisterConfiguration::Crankshaft();
121 2725600 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
122 : int code = config->GetAllocatableDoubleCode(i);
123 1277625 : XMMRegister xmm_reg = XMMRegister::from_code(code);
124 1277625 : int offset = code * kDoubleSize;
125 2555250 : __ Movsd(Operand(rsp, offset), xmm_reg);
126 : }
127 :
128 : const int kFloatRegsSize = kFloatSize * XMMRegister::kMaxNumRegisters;
129 85175 : __ subp(rsp, Immediate(kFloatRegsSize));
130 :
131 2725600 : for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
132 : int code = config->GetAllocatableFloatCode(i);
133 1277625 : XMMRegister xmm_reg = XMMRegister::from_code(code);
134 1277625 : int offset = code * kFloatSize;
135 2555250 : __ Movss(Operand(rsp, offset), xmm_reg);
136 : }
137 :
138 : // We push all registers onto the stack, even though we do not need
139 : // to restore all later.
140 1362800 : for (int i = 0; i < kNumberOfRegisters; i++) {
141 1362800 : Register r = Register::from_code(i);
142 1362800 : __ pushq(r);
143 : }
144 :
145 : const int kSavedRegistersAreaSize =
146 : kNumberOfRegisters * kRegisterSize + kDoubleRegsSize + kFloatRegsSize;
147 :
148 170350 : __ Store(ExternalReference(Isolate::kCEntryFPAddress, isolate()), rbp);
149 :
150 : // We use this to keep the value of the fifth argument temporarily.
151 : // Unfortunately we can't store it directly in r8 (used for passing
152 : // this on linux), since it is another parameter passing register on windows.
153 : Register arg5 = r11;
154 :
155 : // Get the bailout id from the stack.
156 255525 : __ movp(arg_reg_3, Operand(rsp, kSavedRegistersAreaSize));
157 :
158 : // Get the address of the location in the code object
159 : // and compute the fp-to-sp delta in register arg5.
160 255525 : __ movp(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize));
161 : __ leap(arg5, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize +
162 255525 : kPCOnStackSize));
163 :
164 85175 : __ subp(arg5, rbp);
165 85175 : __ negp(arg5);
166 :
167 : // Allocate a new deoptimizer object.
168 85175 : __ PrepareCallCFunction(6);
169 85175 : __ movp(rax, Immediate(0));
170 : Label context_check;
171 255525 : __ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
172 85175 : __ JumpIfSmi(rdi, &context_check);
173 255525 : __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
174 85175 : __ bind(&context_check);
175 85175 : __ movp(arg_reg_1, rax);
176 170350 : __ Set(arg_reg_2, type());
177 : // Args 3 and 4 are already in the right registers.
178 :
179 : // On windows put the arguments on the stack (PrepareCallCFunction
180 : // has created space for this). On linux pass the arguments in r8 and r9.
181 : #ifdef _WIN64
182 : __ movq(Operand(rsp, 4 * kRegisterSize), arg5);
183 : __ LoadAddress(arg5, ExternalReference::isolate_address(isolate()));
184 : __ movq(Operand(rsp, 5 * kRegisterSize), arg5);
185 : #else
186 85175 : __ movp(r8, arg5);
187 170350 : __ LoadAddress(r9, ExternalReference::isolate_address(isolate()));
188 : #endif
189 :
190 : { AllowExternalCallThatCantCauseGC scope(masm());
191 170350 : __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
192 : }
193 : // Preserve deoptimizer object in register rax and get the input
194 : // frame descriptor pointer.
195 255525 : __ movp(rbx, Operand(rax, Deoptimizer::input_offset()));
196 :
197 : // Fill in the input registers.
198 1447975 : for (int i = kNumberOfRegisters -1; i >= 0; i--) {
199 1362800 : int offset = (i * kPointerSize) + FrameDescription::registers_offset();
200 2725600 : __ PopQuad(Operand(rbx, offset));
201 : }
202 :
203 : // Fill in the float input registers.
204 : int float_regs_offset = FrameDescription::float_registers_offset();
205 1362800 : for (int i = 0; i < XMMRegister::kMaxNumRegisters; i++) {
206 1362800 : int src_offset = i * kFloatSize;
207 1362800 : int dst_offset = i * kFloatSize + float_regs_offset;
208 4088400 : __ movl(rcx, Operand(rsp, src_offset));
209 4088400 : __ movl(Operand(rbx, dst_offset), rcx);
210 : }
211 85175 : __ addp(rsp, Immediate(kFloatRegsSize));
212 :
213 : // Fill in the double input registers.
214 : int double_regs_offset = FrameDescription::double_registers_offset();
215 1447975 : for (int i = 0; i < XMMRegister::kMaxNumRegisters; i++) {
216 1362800 : int dst_offset = i * kDoubleSize + double_regs_offset;
217 2725600 : __ popq(Operand(rbx, dst_offset));
218 : }
219 :
220 : // Remove the bailout id and return address from the stack.
221 85175 : __ addp(rsp, Immediate(1 * kRegisterSize + kPCOnStackSize));
222 :
223 : // Compute a pointer to the unwinding limit in register rcx; that is
224 : // the first stack slot not part of the input frame.
225 255525 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
226 85175 : __ addp(rcx, rsp);
227 :
228 : // Unwind the stack down to - but not including - the unwinding
229 : // limit and copy the contents of the activation frame to the input
230 : // frame description.
231 255525 : __ leap(rdx, Operand(rbx, FrameDescription::frame_content_offset()));
232 : Label pop_loop_header;
233 85175 : __ jmp(&pop_loop_header);
234 : Label pop_loop;
235 85175 : __ bind(&pop_loop);
236 170350 : __ Pop(Operand(rdx, 0));
237 85175 : __ addp(rdx, Immediate(sizeof(intptr_t)));
238 85175 : __ bind(&pop_loop_header);
239 85175 : __ cmpp(rcx, rsp);
240 85175 : __ j(not_equal, &pop_loop);
241 :
242 : // Compute the output frame in the deoptimizer.
243 85175 : __ pushq(rax);
244 85175 : __ PrepareCallCFunction(2);
245 85175 : __ movp(arg_reg_1, rax);
246 170350 : __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate()));
247 : {
248 : AllowExternalCallThatCantCauseGC scope(masm());
249 : __ CallCFunction(
250 170350 : ExternalReference::compute_output_frames_function(isolate()), 2);
251 : }
252 85175 : __ popq(rax);
253 :
254 255525 : __ movp(rsp, Operand(rax, Deoptimizer::caller_frame_top_offset()));
255 :
256 : // Replace the current (input) frame with the output frames.
257 : Label outer_push_loop, inner_push_loop,
258 : outer_loop_header, inner_loop_header;
259 : // Outer loop state: rax = current FrameDescription**, rdx = one past the
260 : // last FrameDescription**.
261 255525 : __ movl(rdx, Operand(rax, Deoptimizer::output_count_offset()));
262 255525 : __ movp(rax, Operand(rax, Deoptimizer::output_offset()));
263 255525 : __ leap(rdx, Operand(rax, rdx, times_pointer_size, 0));
264 85175 : __ jmp(&outer_loop_header);
265 85175 : __ bind(&outer_push_loop);
266 : // Inner loop state: rbx = current FrameDescription*, rcx = loop index.
267 255525 : __ movp(rbx, Operand(rax, 0));
268 255525 : __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
269 85175 : __ jmp(&inner_loop_header);
270 85175 : __ bind(&inner_push_loop);
271 85175 : __ subp(rcx, Immediate(sizeof(intptr_t)));
272 170350 : __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset()));
273 85175 : __ bind(&inner_loop_header);
274 85175 : __ testp(rcx, rcx);
275 85175 : __ j(not_zero, &inner_push_loop);
276 85175 : __ addp(rax, Immediate(kPointerSize));
277 85175 : __ bind(&outer_loop_header);
278 85175 : __ cmpp(rax, rdx);
279 85175 : __ j(below, &outer_push_loop);
280 :
281 2725600 : for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
282 : int code = config->GetAllocatableDoubleCode(i);
283 1277625 : XMMRegister xmm_reg = XMMRegister::from_code(code);
284 1277625 : int src_offset = code * kDoubleSize + double_regs_offset;
285 2555250 : __ Movsd(xmm_reg, Operand(rbx, src_offset));
286 : }
287 :
288 : // Push state, pc, and continuation from the last output frame.
289 170350 : __ Push(Operand(rbx, FrameDescription::state_offset()));
290 170350 : __ PushQuad(Operand(rbx, FrameDescription::pc_offset()));
291 170350 : __ PushQuad(Operand(rbx, FrameDescription::continuation_offset()));
292 :
293 : // Push the registers from the last output frame.
294 1447975 : for (int i = 0; i < kNumberOfRegisters; i++) {
295 1362800 : int offset = (i * kPointerSize) + FrameDescription::registers_offset();
296 2725600 : __ PushQuad(Operand(rbx, offset));
297 : }
298 :
299 : // Restore the registers from the stack.
300 1362800 : for (int i = kNumberOfRegisters - 1; i >= 0 ; i--) {
301 : Register r = Register::from_code(i);
302 : // Do not restore rsp, simply pop the value into the next register
303 : // and overwrite this afterwards.
304 1362800 : if (r.is(rsp)) {
305 : DCHECK(i > 0);
306 85175 : r = Register::from_code(i - 1);
307 : }
308 1362800 : __ popq(r);
309 : }
310 :
311 : // Set up the roots register.
312 85175 : __ InitializeRootRegister();
313 :
314 : // Return to the continuation point.
315 85175 : __ ret(0);
316 85175 : }
317 :
318 :
319 25002981 : void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
320 : // Create a sequence of deoptimization entries.
321 : Label done;
322 16668654 : for (int i = 0; i < count(); i++) {
323 : int start = masm()->pc_offset();
324 : USE(start);
325 8249152 : __ pushq_imm32(i);
326 8249152 : __ jmp(&done);
327 : DCHECK(masm()->pc_offset() - start == table_entry_size_);
328 : }
329 85175 : __ bind(&done);
330 85175 : }
331 :
332 :
333 155057 : void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
334 : if (kPCOnStackSize == 2 * kPointerSize) {
335 : // Zero out the high-32 bit of PC for x32 port.
336 : SetFrameSlot(offset + kPointerSize, 0);
337 : }
338 : SetFrameSlot(offset, value);
339 155057 : }
340 :
341 :
342 155057 : void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
343 : if (kFPOnStackSize == 2 * kPointerSize) {
344 : // Zero out the high-32 bit of FP for x32 port.
345 : SetFrameSlot(offset + kPointerSize, 0);
346 : }
347 : SetFrameSlot(offset, value);
348 155057 : }
349 :
350 :
351 0 : void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
352 : // No embedded constant pool support.
353 0 : UNREACHABLE();
354 : }
355 :
356 :
357 : #undef __
358 :
359 :
360 : } // namespace internal
361 : } // namespace v8
362 :
363 : #endif // V8_TARGET_ARCH_X64
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