| // 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_CODEGEN_IA32_ASSEMBLER_IA32_INL_H_ |
| #define V8_CODEGEN_IA32_ASSEMBLER_IA32_INL_H_ |
| |
| #include "src/codegen/ia32/assembler-ia32.h" |
| |
| #include "src/base/memory.h" |
| #include "src/codegen/assembler.h" |
| #include "src/debug/debug.h" |
| #include "src/objects/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::OFF_HEAP_TARGET) | |
| RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY))); |
| if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_) || |
| IsOffHeapTarget(rmode_)) { |
| base::WriteUnalignedValue(pc_, |
| base::ReadUnalignedValue<int32_t>(pc_) - delta); |
| } else if (IsInternalReference(rmode_)) { |
| // Absolute code pointer inside code object moves with the code object. |
| base::WriteUnalignedValue(pc_, |
| base::ReadUnalignedValue<int32_t>(pc_) + delta); |
| } |
| } |
| |
| 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(HasTargetAddressAddress()); |
| 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_ == FULL_EMBEDDED_OBJECT); |
| return HeapObject::cast(Object(ReadUnalignedValue<Address>(pc_))); |
| } |
| |
| HeapObject RelocInfo::target_object_no_host(Isolate* isolate) { |
| return target_object(); |
| } |
| |
| Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) { |
| DCHECK(IsCodeTarget(rmode_) || rmode_ == FULL_EMBEDDED_OBJECT); |
| return Handle<HeapObject>::cast(ReadUnalignedValue<Handle<Object>>(pc_)); |
| } |
| |
| void RelocInfo::set_target_object(Heap* heap, HeapObject target, |
| WriteBarrierMode write_barrier_mode, |
| ICacheFlushMode icache_flush_mode) { |
| DCHECK(IsCodeTarget(rmode_) || rmode_ == FULL_EMBEDDED_OBJECT); |
| WriteUnalignedValue(pc_, target.ptr()); |
| if (icache_flush_mode != SKIP_ICACHE_FLUSH) { |
| FlushInstructionCache(pc_, sizeof(Address)); |
| } |
| if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null() && |
| !FLAG_disable_write_barriers) { |
| WriteBarrierForCode(host(), this, target); |
| } |
| } |
| |
| Address RelocInfo::target_external_reference() { |
| DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE); |
| return ReadUnalignedValue<Address>(pc_); |
| } |
| |
| void RelocInfo::set_target_external_reference( |
| Address target, ICacheFlushMode icache_flush_mode) { |
| DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE); |
| WriteUnalignedValue(pc_, target); |
| if (icache_flush_mode != SKIP_ICACHE_FLUSH) { |
| FlushInstructionCache(pc_, sizeof(Address)); |
| } |
| } |
| |
| Address RelocInfo::target_internal_reference() { |
| DCHECK(rmode_ == INTERNAL_REFERENCE); |
| return ReadUnalignedValue<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 ReadUnalignedValue<Address>(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 (IsFullEmbeddedObject(rmode_) || IsExternalReference(rmode_) || |
| IsInternalReference(rmode_)) { |
| WriteUnalignedValue(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(); |
| } |
| } |
| |
| void Assembler::emit(uint32_t x) { |
| WriteUnalignedValue(reinterpret_cast<Address>(pc_), x); |
| pc_ += sizeof(uint32_t); |
| } |
| |
| void Assembler::emit_q(uint64_t x) { |
| WriteUnalignedValue(reinterpret_cast<Address>(pc_), x); |
| pc_ += sizeof(uint64_t); |
| } |
| |
| void Assembler::emit(Handle<HeapObject> handle) { |
| emit(handle.address(), RelocInfo::FULL_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()); |
| WriteUnalignedValue(reinterpret_cast<Address>(pc_), value); |
| pc_ += sizeof(uint16_t); |
| } |
| |
| Address Assembler::target_address_at(Address pc, Address constant_pool) { |
| return pc + sizeof(int32_t) + ReadUnalignedValue<int32_t>(pc); |
| } |
| |
| void Assembler::set_target_address_at(Address pc, Address constant_pool, |
| Address target, |
| ICacheFlushMode icache_flush_mode) { |
| WriteUnalignedValue(pc, target - (pc + sizeof(int32_t))); |
| if (icache_flush_mode != SKIP_ICACHE_FLUSH) { |
| FlushInstructionCache(pc, sizeof(int32_t)); |
| } |
| } |
| |
| void Assembler::deserialization_set_special_target_at( |
| Address instruction_payload, Code code, Address target) { |
| set_target_address_at(instruction_payload, |
| !code.is_null() ? 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) { |
| WriteUnalignedValue(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_CODEGEN_IA32_ASSEMBLER_IA32_INL_H_ |