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// 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::SupportsCrankshaft() { return true; }
bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }
static const byte kCallOpcode = 0xE8;
static const int kNoCodeAgeSequenceLength = 5;
// The modes possibly affected by apply must be in kApplyMask.
void RelocInfo::apply(intptr_t delta) {
if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_) ||
rmode_ == RelocInfo::JS_TO_WASM_CALL) {
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_) ||
rmode_ == EMBEDDED_OBJECT || rmode_ == EXTERNAL_REFERENCE);
return reinterpret_cast<Address>(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_at(pc_));
}
Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
return Handle<HeapObject>::cast(Memory::Object_Handle_at(pc_));
}
void RelocInfo::set_target_object(HeapObject* target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
Memory::Object_at(pc_) = target;
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(target->GetIsolate(), pc_, sizeof(Address));
}
if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != nullptr) {
host()->GetHeap()->RecordWriteIntoCode(host(), this, target);
host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(host(), this,
target);
}
}
Address RelocInfo::target_external_reference() {
DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
return Memory::Address_at(pc_);
}
Address RelocInfo::target_internal_reference() {
DCHECK(rmode_ == INTERNAL_REFERENCE);
return Memory::Address_at(pc_);
}
Address RelocInfo::target_internal_reference_address() {
DCHECK(rmode_ == INTERNAL_REFERENCE);
return reinterpret_cast<Address>(pc_);
}
Address RelocInfo::target_runtime_entry(Assembler* origin) {
DCHECK(IsRuntimeEntry(rmode_));
return reinterpret_cast<Address>(*reinterpret_cast<int32_t*>(pc_));
}
void RelocInfo::set_target_runtime_entry(Isolate* isolate, Address target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsRuntimeEntry(rmode_));
if (target_address() != target) {
set_target_address(isolate, target, write_barrier_mode, icache_flush_mode);
}
}
void RelocInfo::WipeOut(Isolate* isolate) {
if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_) ||
IsInternalReference(rmode_)) {
Memory::Address_at(pc_) = nullptr;
} else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
// Effectively write zero into the relocation.
Assembler::set_target_address_at(isolate, pc_, constant_pool_,
pc_ + sizeof(int32_t));
} else {
UNREACHABLE();
}
}
template <typename ObjectVisitor>
void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
RelocInfo::Mode mode = rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
visitor->VisitEmbeddedPointer(host(), this);
Assembler::FlushICache(isolate, pc_, sizeof(Address));
} else if (RelocInfo::IsCodeTarget(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);
}
}
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(reinterpret_cast<intptr_t>(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(reinterpret_cast<intptr_t>(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(Isolate* isolate, Address pc,
Address constant_pool, Address target,
ICacheFlushMode icache_flush_mode) {
DCHECK_IMPLIES(isolate == nullptr, icache_flush_mode == SKIP_ICACHE_FLUSH);
int32_t* p = reinterpret_cast<int32_t*>(pc);
*p = target - (pc + sizeof(int32_t));
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(isolate, p, sizeof(int32_t));
}
}
Address Assembler::target_address_from_return_address(Address pc) {
return pc - kCallTargetAddressOffset;
}
void Assembler::deserialization_set_special_target_at(
Isolate* isolate, Address instruction_payload, Code* code, Address target) {
set_target_address_at(isolate, instruction_payload,
code ? code->constant_pool() : nullptr, target);
}
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(
Isolate* isolate, Address pc, Address target, RelocInfo::Mode mode) {
Memory::Address_at(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;
}
Operand::Operand(Immediate imm) {
// [disp/r]
set_modrm(0, ebp);
set_dispr(imm.immediate(), imm.rmode_);
}
} // namespace internal
} // namespace v8
#endif // V8_IA32_ASSEMBLER_IA32_INL_H_