1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
|
// Copyright (c) 1994-2006 Sun Microsystems Inc.
// All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// - Redistribution in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// - Neither the name of Sun Microsystems or the names of contributors may
// be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The original source code covered by the above license above has been
// modified significantly by Google Inc.
// Copyright 2012 the V8 project authors. All rights reserved.
// A light-weight IA32 Assembler.
#ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
#define V8_IA32_ASSEMBLER_IA32_INL_H_
#include "src/ia32/assembler-ia32.h"
#include "src/assembler.h"
#include "src/debug/debug.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
bool CpuFeatures::SupportsOptimizer() { return true; }
bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }
// The modes possibly affected by apply must be in kApplyMask.
void RelocInfo::apply(intptr_t delta) {
DCHECK_EQ(kApplyMask, (RelocInfo::ModeMask(RelocInfo::CODE_TARGET) |
RelocInfo::ModeMask(RelocInfo::INTERNAL_REFERENCE) |
RelocInfo::ModeMask(RelocInfo::JS_TO_WASM_CALL) |
RelocInfo::ModeMask(RelocInfo::OFF_HEAP_TARGET) |
RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY)));
if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_) ||
IsJsToWasmCall(rmode_) || IsOffHeapTarget(rmode_)) {
int32_t* p = reinterpret_cast<int32_t*>(pc_);
*p -= delta; // Relocate entry.
} else if (IsInternalReference(rmode_)) {
// absolute code pointer inside code object moves with the code object.
int32_t* p = reinterpret_cast<int32_t*>(pc_);
*p += delta; // Relocate entry.
}
}
Address RelocInfo::target_address() {
DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) || IsWasmCall(rmode_));
return Assembler::target_address_at(pc_, constant_pool_);
}
Address RelocInfo::target_address_address() {
DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) || IsWasmCall(rmode_) ||
IsWasmStubCall(rmode_) || IsEmbeddedObject(rmode_) ||
IsExternalReference(rmode_) || IsOffHeapTarget(rmode_));
return pc_;
}
Address RelocInfo::constant_pool_entry_address() {
UNREACHABLE();
}
int RelocInfo::target_address_size() {
return Assembler::kSpecialTargetSize;
}
HeapObject* RelocInfo::target_object() {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
return HeapObject::cast(Memory<Object*>(pc_));
}
Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
return Handle<HeapObject>::cast(Memory<Handle<Object>>(pc_));
}
void RelocInfo::set_target_object(Heap* heap, HeapObject* target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
Memory<Object*>(pc_) = target;
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(pc_, sizeof(Address));
}
if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != nullptr) {
WriteBarrierForCode(host(), this, target);
}
}
Address RelocInfo::target_external_reference() {
DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
return Memory<Address>(pc_);
}
void RelocInfo::set_target_external_reference(
Address target, ICacheFlushMode icache_flush_mode) {
DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
Memory<Address>(pc_) = target;
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(pc_, sizeof(Address));
}
}
Address RelocInfo::target_internal_reference() {
DCHECK(rmode_ == INTERNAL_REFERENCE);
return Memory<Address>(pc_);
}
Address RelocInfo::target_internal_reference_address() {
DCHECK(rmode_ == INTERNAL_REFERENCE);
return pc_;
}
Address RelocInfo::target_runtime_entry(Assembler* origin) {
DCHECK(IsRuntimeEntry(rmode_));
return static_cast<Address>(*reinterpret_cast<int32_t*>(pc_));
}
void RelocInfo::set_target_runtime_entry(Address target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsRuntimeEntry(rmode_));
if (target_address() != target) {
set_target_address(target, write_barrier_mode, icache_flush_mode);
}
}
Address RelocInfo::target_off_heap_target() {
DCHECK(IsOffHeapTarget(rmode_));
return Assembler::target_address_at(pc_, constant_pool_);
}
void RelocInfo::WipeOut() {
if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_) ||
IsInternalReference(rmode_)) {
Memory<Address>(pc_) = kNullAddress;
} else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) ||
IsOffHeapTarget(rmode_)) {
// Effectively write zero into the relocation.
Assembler::set_target_address_at(pc_, constant_pool_,
pc_ + sizeof(int32_t));
} else {
UNREACHABLE();
}
}
template <typename ObjectVisitor>
void RelocInfo::Visit(ObjectVisitor* visitor) {
RelocInfo::Mode mode = rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
visitor->VisitEmbeddedPointer(host(), this);
Assembler::FlushICache(pc_, sizeof(Address));
} else if (RelocInfo::IsCodeTargetMode(mode)) {
visitor->VisitCodeTarget(host(), this);
} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
visitor->VisitExternalReference(host(), this);
} else if (mode == RelocInfo::INTERNAL_REFERENCE) {
visitor->VisitInternalReference(host(), this);
} else if (IsRuntimeEntry(mode)) {
visitor->VisitRuntimeEntry(host(), this);
} else if (RelocInfo::IsOffHeapTarget(mode)) {
visitor->VisitOffHeapTarget(host(), this);
}
}
void Assembler::emit(uint32_t x) {
*reinterpret_cast<uint32_t*>(pc_) = x;
pc_ += sizeof(uint32_t);
}
void Assembler::emit_q(uint64_t x) {
*reinterpret_cast<uint64_t*>(pc_) = x;
pc_ += sizeof(uint64_t);
}
void Assembler::emit(Handle<HeapObject> handle) {
emit(handle.address(), RelocInfo::EMBEDDED_OBJECT);
}
void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) {
if (!RelocInfo::IsNone(rmode)) {
RecordRelocInfo(rmode);
}
emit(x);
}
void Assembler::emit(Handle<Code> code, RelocInfo::Mode rmode) {
emit(code.address(), rmode);
}
void Assembler::emit(const Immediate& x) {
if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
Label* label = reinterpret_cast<Label*>(x.immediate());
emit_code_relative_offset(label);
return;
}
if (!RelocInfo::IsNone(x.rmode_)) RecordRelocInfo(x.rmode_);
if (x.is_heap_object_request()) {
RequestHeapObject(x.heap_object_request());
emit(0);
} else {
emit(x.immediate());
}
}
void Assembler::emit_code_relative_offset(Label* label) {
if (label->is_bound()) {
int32_t pos;
pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
emit(pos);
} else {
emit_disp(label, Displacement::CODE_RELATIVE);
}
}
void Assembler::emit_b(Immediate x) {
DCHECK(x.is_int8() || x.is_uint8());
uint8_t value = static_cast<uint8_t>(x.immediate());
*pc_++ = value;
}
void Assembler::emit_w(const Immediate& x) {
DCHECK(RelocInfo::IsNone(x.rmode_));
uint16_t value = static_cast<uint16_t>(x.immediate());
reinterpret_cast<uint16_t*>(pc_)[0] = value;
pc_ += sizeof(uint16_t);
}
Address Assembler::target_address_at(Address pc, Address constant_pool) {
return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
}
void Assembler::set_target_address_at(Address pc, Address constant_pool,
Address target,
ICacheFlushMode icache_flush_mode) {
*reinterpret_cast<int32_t*>(pc) = target - (pc + sizeof(int32_t));
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(pc, sizeof(int32_t));
}
}
Address Assembler::target_address_from_return_address(Address pc) {
return pc - kCallTargetAddressOffset;
}
void Assembler::deserialization_set_special_target_at(
Address instruction_payload, Code* code, Address target) {
set_target_address_at(instruction_payload,
code ? code->constant_pool() : kNullAddress, target);
}
int Assembler::deserialization_special_target_size(
Address instruction_payload) {
return kSpecialTargetSize;
}
Displacement Assembler::disp_at(Label* L) {
return Displacement(long_at(L->pos()));
}
void Assembler::disp_at_put(Label* L, Displacement disp) {
long_at_put(L->pos(), disp.data());
}
void Assembler::emit_disp(Label* L, Displacement::Type type) {
Displacement disp(L, type);
L->link_to(pc_offset());
emit(static_cast<int>(disp.data()));
}
void Assembler::emit_near_disp(Label* L) {
byte disp = 0x00;
if (L->is_near_linked()) {
int offset = L->near_link_pos() - pc_offset();
DCHECK(is_int8(offset));
disp = static_cast<byte>(offset & 0xFF);
}
L->link_to(pc_offset(), Label::kNear);
*pc_++ = disp;
}
void Assembler::deserialization_set_target_internal_reference_at(
Address pc, Address target, RelocInfo::Mode mode) {
Memory<Address>(pc) = target;
}
void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
DCHECK_EQ(len_, 1);
DCHECK_EQ(scale & -4, 0);
// Use SIB with no index register only for base esp.
DCHECK(index != esp || base == esp);
buf_[1] = scale << 6 | index.code() << 3 | base.code();
len_ = 2;
}
void Operand::set_disp8(int8_t disp) {
DCHECK(len_ == 1 || len_ == 2);
*reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
}
} // namespace internal
} // namespace v8
#endif // V8_IA32_ASSEMBLER_IA32_INL_H_
|