1 // Copyright 2021 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 #ifndef V8_CODEGEN_LOONG64_ASSEMBLER_LOONG64_INL_H_
6 #define V8_CODEGEN_LOONG64_ASSEMBLER_LOONG64_INL_H_
7
8 #include "src/codegen/assembler.h"
9 #include "src/codegen/loong64/assembler-loong64.h"
10 #include "src/debug/debug.h"
11 #include "src/objects/objects-inl.h"
12
13 namespace v8 {
14 namespace internal {
15
SupportsOptimizer()16 bool CpuFeatures::SupportsOptimizer() { return IsSupported(FPU); }
17
18 // -----------------------------------------------------------------------------
19 // Operand and MemOperand.
20
is_reg()21 bool Operand::is_reg() const { return rm_.is_valid(); }
22
immediate()23 int64_t Operand::immediate() const {
24 DCHECK(!is_reg());
25 DCHECK(!IsHeapObjectRequest());
26 return value_.immediate;
27 }
28
29 // -----------------------------------------------------------------------------
30 // RelocInfo.
31
apply(intptr_t delta)32 void RelocInfo::apply(intptr_t delta) {
33 if (IsInternalReference(rmode_)) {
34 // Absolute code pointer inside code object moves with the code object.
35 Assembler::RelocateInternalReference(rmode_, pc_, delta);
36 } else {
37 DCHECK(IsRelativeCodeTarget(rmode_));
38 Assembler::RelocateRelativeReference(rmode_, pc_, delta);
39 }
40 }
41
target_address()42 Address RelocInfo::target_address() {
43 DCHECK(IsCodeTargetMode(rmode_) || IsRuntimeEntry(rmode_) ||
44 IsWasmCall(rmode_));
45 return Assembler::target_address_at(pc_, constant_pool_);
46 }
47
target_address_address()48 Address RelocInfo::target_address_address() {
49 DCHECK(HasTargetAddressAddress());
50 // Read the address of the word containing the target_address in an
51 // instruction stream.
52 // The only architecture-independent user of this function is the serializer.
53 // The serializer uses it to find out how many raw bytes of instruction to
54 // output before the next target.
55 // For an instruction like LUI/ORI where the target bits are mixed into the
56 // instruction bits, the size of the target will be zero, indicating that the
57 // serializer should not step forward in memory after a target is resolved
58 // and written. In this case the target_address_address function should
59 // return the end of the instructions to be patched, allowing the
60 // deserializer to deserialize the instructions as raw bytes and put them in
61 // place, ready to be patched with the target. After jump optimization,
62 // that is the address of the instruction that follows J/JAL/JR/JALR
63 // instruction.
64 return pc_ + Assembler::kInstructionsFor64BitConstant * kInstrSize;
65 }
66
constant_pool_entry_address()67 Address RelocInfo::constant_pool_entry_address() { UNREACHABLE(); }
68
target_address_size()69 int RelocInfo::target_address_size() { return Assembler::kSpecialTargetSize; }
70
deserialization_set_special_target_at(Address instruction_payload,Code code,Address target)71 void Assembler::deserialization_set_special_target_at(
72 Address instruction_payload, Code code, Address target) {
73 set_target_address_at(instruction_payload,
74 !code.is_null() ? code.constant_pool() : kNullAddress,
75 target);
76 }
77
deserialization_special_target_size(Address instruction_payload)78 int Assembler::deserialization_special_target_size(
79 Address instruction_payload) {
80 return kSpecialTargetSize;
81 }
82
deserialization_set_target_internal_reference_at(Address pc,Address target,RelocInfo::Mode mode)83 void Assembler::deserialization_set_target_internal_reference_at(
84 Address pc, Address target, RelocInfo::Mode mode) {
85 WriteUnalignedValue<Address>(pc, target);
86 }
87
target_object(PtrComprCageBase cage_base)88 HeapObject RelocInfo::target_object(PtrComprCageBase cage_base) {
89 DCHECK(IsCodeTarget(rmode_) || IsFullEmbeddedObject(rmode_) ||
90 IsDataEmbeddedObject(rmode_));
91 if (IsDataEmbeddedObject(rmode_)) {
92 return HeapObject::cast(Object(ReadUnalignedValue<Address>(pc_)));
93 }
94 return HeapObject::cast(
95 Object(Assembler::target_address_at(pc_, constant_pool_)));
96 }
97
target_object_handle(Assembler * origin)98 Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
99 if (IsDataEmbeddedObject(rmode_)) {
100 return Handle<HeapObject>::cast(ReadUnalignedValue<Handle<Object>>(pc_));
101 } else if (IsCodeTarget(rmode_) || IsFullEmbeddedObject(rmode_)) {
102 return Handle<HeapObject>(reinterpret_cast<Address*>(
103 Assembler::target_address_at(pc_, constant_pool_)));
104 } else {
105 DCHECK(IsRelativeCodeTarget(rmode_));
106 return origin->relative_code_target_object_handle_at(pc_);
107 }
108 }
109
set_target_object(Heap * heap,HeapObject target,WriteBarrierMode write_barrier_mode,ICacheFlushMode icache_flush_mode)110 void RelocInfo::set_target_object(Heap* heap, HeapObject target,
111 WriteBarrierMode write_barrier_mode,
112 ICacheFlushMode icache_flush_mode) {
113 DCHECK(IsCodeTarget(rmode_) || IsFullEmbeddedObject(rmode_) ||
114 IsDataEmbeddedObject(rmode_));
115 if (IsDataEmbeddedObject(rmode_)) {
116 WriteUnalignedValue(pc_, target.ptr());
117 // No need to flush icache since no instructions were changed.
118 } else {
119 Assembler::set_target_address_at(pc_, constant_pool_, target.ptr(),
120 icache_flush_mode);
121 }
122 if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null() &&
123 !FLAG_disable_write_barriers) {
124 WriteBarrierForCode(host(), this, target);
125 }
126 }
127
target_external_reference()128 Address RelocInfo::target_external_reference() {
129 DCHECK(rmode_ == EXTERNAL_REFERENCE);
130 return Assembler::target_address_at(pc_, constant_pool_);
131 }
132
set_target_external_reference(Address target,ICacheFlushMode icache_flush_mode)133 void RelocInfo::set_target_external_reference(
134 Address target, ICacheFlushMode icache_flush_mode) {
135 DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
136 Assembler::set_target_address_at(pc_, constant_pool_, target,
137 icache_flush_mode);
138 }
139
target_internal_reference()140 Address RelocInfo::target_internal_reference() {
141 if (rmode_ == INTERNAL_REFERENCE) {
142 return Memory<Address>(pc_);
143 } else {
144 UNREACHABLE();
145 }
146 }
147
target_internal_reference_address()148 Address RelocInfo::target_internal_reference_address() {
149 DCHECK(rmode_ == INTERNAL_REFERENCE);
150 return pc_;
151 }
152
relative_code_target_object_handle_at(Address pc)153 Handle<Code> Assembler::relative_code_target_object_handle_at(
154 Address pc) const {
155 Instr instr = Assembler::instr_at(pc);
156 int32_t code_target_index = instr & kImm26Mask;
157 code_target_index = ((code_target_index & 0x3ff) << 22 >> 6) |
158 ((code_target_index >> 10) & kImm16Mask);
159 return GetCodeTarget(code_target_index);
160 }
161
target_runtime_entry(Assembler * origin)162 Address RelocInfo::target_runtime_entry(Assembler* origin) {
163 DCHECK(IsRuntimeEntry(rmode_));
164 return target_address();
165 }
166
set_target_runtime_entry(Address target,WriteBarrierMode write_barrier_mode,ICacheFlushMode icache_flush_mode)167 void RelocInfo::set_target_runtime_entry(Address target,
168 WriteBarrierMode write_barrier_mode,
169 ICacheFlushMode icache_flush_mode) {
170 DCHECK(IsRuntimeEntry(rmode_));
171 if (target_address() != target)
172 set_target_address(target, write_barrier_mode, icache_flush_mode);
173 }
174
target_off_heap_target()175 Address RelocInfo::target_off_heap_target() {
176 DCHECK(IsOffHeapTarget(rmode_));
177 return Assembler::target_address_at(pc_, constant_pool_);
178 }
179
WipeOut()180 void RelocInfo::WipeOut() {
181 DCHECK(IsFullEmbeddedObject(rmode_) || IsCodeTarget(rmode_) ||
182 IsRuntimeEntry(rmode_) || IsExternalReference(rmode_) ||
183 IsInternalReference(rmode_) || IsOffHeapTarget(rmode_));
184 if (IsInternalReference(rmode_)) {
185 Memory<Address>(pc_) = kNullAddress;
186 } else {
187 Assembler::set_target_address_at(pc_, constant_pool_, kNullAddress);
188 }
189 }
190
191 // -----------------------------------------------------------------------------
192 // Assembler.
193
CheckBuffer()194 void Assembler::CheckBuffer() {
195 if (buffer_space() <= kGap) {
196 GrowBuffer();
197 }
198 }
199
EmitHelper(Instr x)200 void Assembler::EmitHelper(Instr x) {
201 *reinterpret_cast<Instr*>(pc_) = x;
202 pc_ += kInstrSize;
203 CheckTrampolinePoolQuick();
204 }
205
206 template <>
207 inline void Assembler::EmitHelper(uint8_t x);
208
209 template <typename T>
EmitHelper(T x)210 void Assembler::EmitHelper(T x) {
211 *reinterpret_cast<T*>(pc_) = x;
212 pc_ += sizeof(x);
213 CheckTrampolinePoolQuick();
214 }
215
216 template <>
EmitHelper(uint8_t x)217 void Assembler::EmitHelper(uint8_t x) {
218 *reinterpret_cast<uint8_t*>(pc_) = x;
219 pc_ += sizeof(x);
220 if (reinterpret_cast<intptr_t>(pc_) % kInstrSize == 0) {
221 CheckTrampolinePoolQuick();
222 }
223 }
224
emit(Instr x)225 void Assembler::emit(Instr x) {
226 if (!is_buffer_growth_blocked()) {
227 CheckBuffer();
228 }
229 EmitHelper(x);
230 }
231
emit(uint64_t data)232 void Assembler::emit(uint64_t data) {
233 // CheckForEmitInForbiddenSlot();
234 if (!is_buffer_growth_blocked()) {
235 CheckBuffer();
236 }
237 EmitHelper(data);
238 }
239
EnsureSpace(Assembler * assembler)240 EnsureSpace::EnsureSpace(Assembler* assembler) { assembler->CheckBuffer(); }
241
242 } // namespace internal
243 } // namespace v8
244
245 #endif // V8_CODEGEN_LOONG64_ASSEMBLER_LOONG64_INL_H_
246