1 // Copyright (c) 1994-2006 Sun Microsystems Inc.
2 // All Rights Reserved.
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5 // modification, are permitted provided that the following conditions are
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9 // this list of conditions and the following disclaimer.
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16 // be used to endorse or promote products derived from this software without
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28 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 // The original source code covered by the above license above has been
32 // modified significantly by Google Inc.
33 // Copyright 2012 the V8 project authors. All rights reserved.
35 // A light-weight IA32 Assembler.
37 #ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
38 #define V8_IA32_ASSEMBLER_IA32_INL_H_
40 #include "src/ia32/assembler-ia32.h"
42 #include "src/assembler.h"
43 #include "src/debug.h"
48 bool CpuFeatures::SupportsCrankshaft() { return true; }
51 static const byte kCallOpcode = 0xE8;
52 static const int kNoCodeAgeSequenceLength = 5;
55 // The modes possibly affected by apply must be in kApplyMask.
56 void RelocInfo::apply(intptr_t delta, ICacheFlushMode icache_flush_mode) {
57 bool flush_icache = icache_flush_mode != SKIP_ICACHE_FLUSH;
58 if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_)) {
59 int32_t* p = reinterpret_cast<int32_t*>(pc_);
60 *p -= delta; // Relocate entry.
61 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
62 } else if (rmode_ == CODE_AGE_SEQUENCE) {
63 if (*pc_ == kCallOpcode) {
64 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
65 *p -= delta; // Relocate entry.
66 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
68 } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
69 // Special handling of js_return when a break point is set (call
70 // instruction has been inserted).
71 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
72 *p -= delta; // Relocate entry.
73 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
74 } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
75 // Special handling of a debug break slot when a break point is set (call
76 // instruction has been inserted).
77 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
78 *p -= delta; // Relocate entry.
79 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
80 } else if (IsInternalReference(rmode_)) {
81 // absolute code pointer inside code object moves with the code object.
82 int32_t* p = reinterpret_cast<int32_t*>(pc_);
83 *p += delta; // Relocate entry.
84 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
89 Address RelocInfo::target_address() {
90 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
91 return Assembler::target_address_at(pc_, host_);
95 Address RelocInfo::target_address_address() {
96 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
97 || rmode_ == EMBEDDED_OBJECT
98 || rmode_ == EXTERNAL_REFERENCE);
99 return reinterpret_cast<Address>(pc_);
103 Address RelocInfo::constant_pool_entry_address() {
109 int RelocInfo::target_address_size() {
110 return Assembler::kSpecialTargetSize;
114 void RelocInfo::set_target_address(Address target,
115 WriteBarrierMode write_barrier_mode,
116 ICacheFlushMode icache_flush_mode) {
117 Assembler::set_target_address_at(pc_, host_, target, icache_flush_mode);
118 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
119 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
120 IsCodeTarget(rmode_)) {
121 Object* target_code = Code::GetCodeFromTargetAddress(target);
122 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
123 host(), this, HeapObject::cast(target_code));
128 Object* RelocInfo::target_object() {
129 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
130 return Memory::Object_at(pc_);
134 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
135 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
136 return Memory::Object_Handle_at(pc_);
140 void RelocInfo::set_target_object(Object* target,
141 WriteBarrierMode write_barrier_mode,
142 ICacheFlushMode icache_flush_mode) {
143 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
144 Memory::Object_at(pc_) = target;
145 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
146 CpuFeatures::FlushICache(pc_, sizeof(Address));
148 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
150 target->IsHeapObject()) {
151 host()->GetHeap()->incremental_marking()->RecordWrite(
152 host(), &Memory::Object_at(pc_), HeapObject::cast(target));
157 Address RelocInfo::target_reference() {
158 DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
159 return Memory::Address_at(pc_);
163 Address RelocInfo::target_runtime_entry(Assembler* origin) {
164 DCHECK(IsRuntimeEntry(rmode_));
165 return reinterpret_cast<Address>(*reinterpret_cast<int32_t*>(pc_));
169 void RelocInfo::set_target_runtime_entry(Address target,
170 WriteBarrierMode write_barrier_mode,
171 ICacheFlushMode icache_flush_mode) {
172 DCHECK(IsRuntimeEntry(rmode_));
173 if (target_address() != target) {
174 set_target_address(target, write_barrier_mode, icache_flush_mode);
179 Handle<Cell> RelocInfo::target_cell_handle() {
180 DCHECK(rmode_ == RelocInfo::CELL);
181 Address address = Memory::Address_at(pc_);
182 return Handle<Cell>(reinterpret_cast<Cell**>(address));
186 Cell* RelocInfo::target_cell() {
187 DCHECK(rmode_ == RelocInfo::CELL);
188 return Cell::FromValueAddress(Memory::Address_at(pc_));
192 void RelocInfo::set_target_cell(Cell* cell,
193 WriteBarrierMode write_barrier_mode,
194 ICacheFlushMode icache_flush_mode) {
195 DCHECK(rmode_ == RelocInfo::CELL);
196 Address address = cell->address() + Cell::kValueOffset;
197 Memory::Address_at(pc_) = address;
198 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
199 CpuFeatures::FlushICache(pc_, sizeof(Address));
201 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL) {
202 // TODO(1550) We are passing NULL as a slot because cell can never be on
203 // evacuation candidate.
204 host()->GetHeap()->incremental_marking()->RecordWrite(
210 Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
211 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
212 DCHECK(*pc_ == kCallOpcode);
213 return Memory::Object_Handle_at(pc_ + 1);
217 Code* RelocInfo::code_age_stub() {
218 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
219 DCHECK(*pc_ == kCallOpcode);
220 return Code::GetCodeFromTargetAddress(
221 Assembler::target_address_at(pc_ + 1, host_));
225 void RelocInfo::set_code_age_stub(Code* stub,
226 ICacheFlushMode icache_flush_mode) {
227 DCHECK(*pc_ == kCallOpcode);
228 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
229 Assembler::set_target_address_at(pc_ + 1, host_, stub->instruction_start(),
234 Address RelocInfo::call_address() {
235 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
236 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
237 return Assembler::target_address_at(pc_ + 1, host_);
241 void RelocInfo::set_call_address(Address target) {
242 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
243 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
244 Assembler::set_target_address_at(pc_ + 1, host_, target);
245 if (host() != NULL) {
246 Object* target_code = Code::GetCodeFromTargetAddress(target);
247 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
248 host(), this, HeapObject::cast(target_code));
253 Object* RelocInfo::call_object() {
254 return *call_object_address();
258 void RelocInfo::set_call_object(Object* target) {
259 *call_object_address() = target;
263 Object** RelocInfo::call_object_address() {
264 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
265 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
266 return reinterpret_cast<Object**>(pc_ + 1);
270 void RelocInfo::WipeOut() {
271 if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_)) {
272 Memory::Address_at(pc_) = NULL;
273 } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
274 // Effectively write zero into the relocation.
275 Assembler::set_target_address_at(pc_, host_, pc_ + sizeof(int32_t));
282 bool RelocInfo::IsPatchedReturnSequence() {
283 return *pc_ == kCallOpcode;
287 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
288 return !Assembler::IsNop(pc());
292 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
293 RelocInfo::Mode mode = rmode();
294 if (mode == RelocInfo::EMBEDDED_OBJECT) {
295 visitor->VisitEmbeddedPointer(this);
296 CpuFeatures::FlushICache(pc_, sizeof(Address));
297 } else if (RelocInfo::IsCodeTarget(mode)) {
298 visitor->VisitCodeTarget(this);
299 } else if (mode == RelocInfo::CELL) {
300 visitor->VisitCell(this);
301 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
302 visitor->VisitExternalReference(this);
303 CpuFeatures::FlushICache(pc_, sizeof(Address));
304 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
305 visitor->VisitCodeAgeSequence(this);
306 } else if (((RelocInfo::IsJSReturn(mode) &&
307 IsPatchedReturnSequence()) ||
308 (RelocInfo::IsDebugBreakSlot(mode) &&
309 IsPatchedDebugBreakSlotSequence())) &&
310 isolate->debug()->has_break_points()) {
311 visitor->VisitDebugTarget(this);
312 } else if (IsRuntimeEntry(mode)) {
313 visitor->VisitRuntimeEntry(this);
318 template<typename StaticVisitor>
319 void RelocInfo::Visit(Heap* heap) {
320 RelocInfo::Mode mode = rmode();
321 if (mode == RelocInfo::EMBEDDED_OBJECT) {
322 StaticVisitor::VisitEmbeddedPointer(heap, this);
323 CpuFeatures::FlushICache(pc_, sizeof(Address));
324 } else if (RelocInfo::IsCodeTarget(mode)) {
325 StaticVisitor::VisitCodeTarget(heap, this);
326 } else if (mode == RelocInfo::CELL) {
327 StaticVisitor::VisitCell(heap, this);
328 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
329 StaticVisitor::VisitExternalReference(this);
330 CpuFeatures::FlushICache(pc_, sizeof(Address));
331 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
332 StaticVisitor::VisitCodeAgeSequence(heap, this);
333 } else if (heap->isolate()->debug()->has_break_points() &&
334 ((RelocInfo::IsJSReturn(mode) &&
335 IsPatchedReturnSequence()) ||
336 (RelocInfo::IsDebugBreakSlot(mode) &&
337 IsPatchedDebugBreakSlotSequence()))) {
338 StaticVisitor::VisitDebugTarget(heap, this);
339 } else if (IsRuntimeEntry(mode)) {
340 StaticVisitor::VisitRuntimeEntry(this);
346 Immediate::Immediate(int x) {
348 rmode_ = RelocInfo::NONE32;
352 Immediate::Immediate(const ExternalReference& ext) {
353 x_ = reinterpret_cast<int32_t>(ext.address());
354 rmode_ = RelocInfo::EXTERNAL_REFERENCE;
358 Immediate::Immediate(Label* internal_offset) {
359 x_ = reinterpret_cast<int32_t>(internal_offset);
360 rmode_ = RelocInfo::INTERNAL_REFERENCE;
364 Immediate::Immediate(Handle<Object> handle) {
365 AllowDeferredHandleDereference using_raw_address;
366 // Verify all Objects referred by code are NOT in new space.
367 Object* obj = *handle;
368 if (obj->IsHeapObject()) {
369 DCHECK(!HeapObject::cast(obj)->GetHeap()->InNewSpace(obj));
370 x_ = reinterpret_cast<intptr_t>(handle.location());
371 rmode_ = RelocInfo::EMBEDDED_OBJECT;
373 // no relocation needed
374 x_ = reinterpret_cast<intptr_t>(obj);
375 rmode_ = RelocInfo::NONE32;
380 Immediate::Immediate(Smi* value) {
381 x_ = reinterpret_cast<intptr_t>(value);
382 rmode_ = RelocInfo::NONE32;
386 Immediate::Immediate(Address addr) {
387 x_ = reinterpret_cast<int32_t>(addr);
388 rmode_ = RelocInfo::NONE32;
392 void Assembler::emit(uint32_t x) {
393 *reinterpret_cast<uint32_t*>(pc_) = x;
394 pc_ += sizeof(uint32_t);
398 void Assembler::emit(Handle<Object> handle) {
399 AllowDeferredHandleDereference heap_object_check;
400 // Verify all Objects referred by code are NOT in new space.
401 Object* obj = *handle;
402 DCHECK(!isolate()->heap()->InNewSpace(obj));
403 if (obj->IsHeapObject()) {
404 emit(reinterpret_cast<intptr_t>(handle.location()),
405 RelocInfo::EMBEDDED_OBJECT);
407 // no relocation needed
408 emit(reinterpret_cast<intptr_t>(obj));
413 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, TypeFeedbackId id) {
414 if (rmode == RelocInfo::CODE_TARGET && !id.IsNone()) {
415 RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, id.ToInt());
416 } else if (!RelocInfo::IsNone(rmode)
417 && rmode != RelocInfo::CODE_AGE_SEQUENCE) {
418 RecordRelocInfo(rmode);
424 void Assembler::emit(Handle<Code> code,
425 RelocInfo::Mode rmode,
427 AllowDeferredHandleDereference embedding_raw_address;
428 emit(reinterpret_cast<intptr_t>(code.location()), rmode, id);
432 void Assembler::emit(const Immediate& x) {
433 if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
434 Label* label = reinterpret_cast<Label*>(x.x_);
435 emit_code_relative_offset(label);
438 if (!RelocInfo::IsNone(x.rmode_)) RecordRelocInfo(x.rmode_);
443 void Assembler::emit_code_relative_offset(Label* label) {
444 if (label->is_bound()) {
446 pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
449 emit_disp(label, Displacement::CODE_RELATIVE);
454 void Assembler::emit_w(const Immediate& x) {
455 DCHECK(RelocInfo::IsNone(x.rmode_));
456 uint16_t value = static_cast<uint16_t>(x.x_);
457 reinterpret_cast<uint16_t*>(pc_)[0] = value;
458 pc_ += sizeof(uint16_t);
462 Address Assembler::target_address_at(Address pc,
463 ConstantPoolArray* constant_pool) {
464 return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
468 void Assembler::set_target_address_at(Address pc,
469 ConstantPoolArray* constant_pool,
471 ICacheFlushMode icache_flush_mode) {
472 int32_t* p = reinterpret_cast<int32_t*>(pc);
473 *p = target - (pc + sizeof(int32_t));
474 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
475 CpuFeatures::FlushICache(p, sizeof(int32_t));
480 Address Assembler::target_address_from_return_address(Address pc) {
481 return pc - kCallTargetAddressOffset;
485 Address Assembler::break_address_from_return_address(Address pc) {
486 return pc - Assembler::kPatchDebugBreakSlotReturnOffset;
490 Displacement Assembler::disp_at(Label* L) {
491 return Displacement(long_at(L->pos()));
495 void Assembler::disp_at_put(Label* L, Displacement disp) {
496 long_at_put(L->pos(), disp.data());
500 void Assembler::emit_disp(Label* L, Displacement::Type type) {
501 Displacement disp(L, type);
502 L->link_to(pc_offset());
503 emit(static_cast<int>(disp.data()));
507 void Assembler::emit_near_disp(Label* L) {
509 if (L->is_near_linked()) {
510 int offset = L->near_link_pos() - pc_offset();
511 DCHECK(is_int8(offset));
512 disp = static_cast<byte>(offset & 0xFF);
514 L->link_to(pc_offset(), Label::kNear);
519 void Operand::set_modrm(int mod, Register rm) {
520 DCHECK((mod & -4) == 0);
521 buf_[0] = mod << 6 | rm.code();
526 void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
528 DCHECK((scale & -4) == 0);
529 // Use SIB with no index register only for base esp.
530 DCHECK(!index.is(esp) || base.is(esp));
531 buf_[1] = scale << 6 | index.code() << 3 | base.code();
536 void Operand::set_disp8(int8_t disp) {
537 DCHECK(len_ == 1 || len_ == 2);
538 *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
542 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
543 DCHECK(len_ == 1 || len_ == 2);
544 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
546 len_ += sizeof(int32_t);
550 Operand::Operand(Register reg) {
556 Operand::Operand(XMMRegister xmm_reg) {
557 Register reg = { xmm_reg.code() };
562 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
565 set_dispr(disp, rmode);
569 Operand::Operand(Immediate imm) {
572 set_dispr(imm.x_, imm.rmode_);
574 } } // namespace v8::internal
576 #endif // V8_IA32_ASSEMBLER_IA32_INL_H_