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// Copyright 2022 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_MAGLEV_MAGLEV_ASSEMBLER_H_
#define V8_MAGLEV_MAGLEV_ASSEMBLER_H_
#include "src/codegen/macro-assembler.h"
#include "src/maglev/maglev-code-gen-state.h"
namespace v8 {
namespace internal {
namespace maglev {
class MaglevAssembler;
// Label allowed to be passed to deferred code.
class ZoneLabelRef {
public:
explicit ZoneLabelRef(Zone* zone) : label_(zone->New<Label>()) {}
explicit inline ZoneLabelRef(MaglevAssembler* masm);
static ZoneLabelRef UnsafeFromLabelPointer(Label* label) {
// This is an unsafe operation, {label} must be zone allocated.
return ZoneLabelRef(label);
}
Label* operator*() { return label_; }
private:
Label* label_;
// Unsafe constructor. {label} must be zone allocated.
explicit ZoneLabelRef(Label* label) : label_(label) {}
};
class MaglevAssembler : public MacroAssembler {
public:
explicit MaglevAssembler(Isolate* isolate, MaglevCodeGenState* code_gen_state)
: MacroAssembler(isolate, CodeObjectRequired::kNo),
code_gen_state_(code_gen_state) {}
inline MemOperand GetStackSlot(const compiler::AllocatedOperand& operand) {
return MemOperand(rbp, GetFramePointerOffsetForStackSlot(operand));
}
inline MemOperand ToMemOperand(const compiler::InstructionOperand& operand) {
return GetStackSlot(compiler::AllocatedOperand::cast(operand));
}
inline MemOperand ToMemOperand(const ValueLocation& location) {
return ToMemOperand(location.operand());
}
inline int GetFramePointerOffsetForStackSlot(
const compiler::AllocatedOperand& operand) {
int index = operand.index();
if (operand.representation() != MachineRepresentation::kTagged) {
index += code_gen_state()->tagged_slots();
}
return GetFramePointerOffsetForStackSlot(index);
}
void Allocate(RegisterSnapshot& register_snapshot, Register result,
int size_in_bytes,
AllocationType alloc_type = AllocationType::kYoung,
AllocationAlignment alignment = kTaggedAligned);
void AllocateTwoByteString(RegisterSnapshot register_snapshot,
Register result, int length);
void LoadSingleCharacterString(Register result, int char_code);
void LoadSingleCharacterString(Register result, Register char_code,
Register scratch);
inline void Branch(Condition condition, BasicBlock* if_true,
BasicBlock* if_false, BasicBlock* next_block);
inline void PushInput(const Input& input);
inline Register FromAnyToRegister(const Input& input, Register scratch);
// Warning: Input registers {string} and {index} will be scratched.
// {result} is allowed to alias with one the other 3 input registers.
// {result} is an int32.
void StringCharCodeAt(RegisterSnapshot& register_snapshot, Register result,
Register string, Register index, Register scratch,
Label* result_fits_one_byte);
// Warning: Input {char_code} will be scratched.
void StringFromCharCode(RegisterSnapshot register_snapshot,
Label* char_code_fits_one_byte, Register result,
Register char_code, Register scratch);
void ToBoolean(Register value, ZoneLabelRef is_true, ZoneLabelRef is_false,
bool fallthrough_when_true);
inline void DefineLazyDeoptPoint(LazyDeoptInfo* info);
inline void DefineExceptionHandlerPoint(NodeBase* node);
inline void DefineExceptionHandlerAndLazyDeoptPoint(NodeBase* node);
template <typename Function, typename... Args>
inline DeferredCodeInfo* PushDeferredCode(Function&& deferred_code_gen,
Args&&... args);
template <typename Function, typename... Args>
inline void JumpToDeferredIf(Condition cond, Function&& deferred_code_gen,
Args&&... args);
inline void RegisterEagerDeopt(EagerDeoptInfo* deopt_info,
DeoptimizeReason reason);
template <typename NodeT>
inline void EmitEagerDeopt(NodeT* node, DeoptimizeReason reason);
template <typename NodeT>
inline void EmitEagerDeoptIf(Condition cond, DeoptimizeReason reason,
NodeT* node);
compiler::NativeContextRef native_context() const {
return code_gen_state()->broker()->target_native_context();
}
MaglevCodeGenState* code_gen_state() const { return code_gen_state_; }
MaglevSafepointTableBuilder* safepoint_table_builder() const {
return code_gen_state()->safepoint_table_builder();
}
MaglevCompilationInfo* compilation_info() const {
return code_gen_state()->compilation_info();
}
private:
inline constexpr int GetFramePointerOffsetForStackSlot(int index) {
return StandardFrameConstants::kExpressionsOffset -
index * kSystemPointerSize;
}
MaglevCodeGenState* const code_gen_state_;
};
class SaveRegisterStateForCall {
public:
SaveRegisterStateForCall(MaglevAssembler* masm, RegisterSnapshot snapshot)
: masm(masm), snapshot_(snapshot) {
masm->PushAll(snapshot_.live_registers);
masm->PushAll(snapshot_.live_double_registers, kDoubleSize);
}
~SaveRegisterStateForCall() {
masm->PopAll(snapshot_.live_double_registers, kDoubleSize);
masm->PopAll(snapshot_.live_registers);
}
MaglevSafepointTableBuilder::Safepoint DefineSafepoint() {
// TODO(leszeks): Avoid emitting safepoints when there are no registers to
// save.
auto safepoint = masm->safepoint_table_builder()->DefineSafepoint(masm);
int pushed_reg_index = 0;
for (Register reg : snapshot_.live_registers) {
if (snapshot_.live_tagged_registers.has(reg)) {
safepoint.DefineTaggedRegister(pushed_reg_index);
}
pushed_reg_index++;
}
int num_pushed_double_reg = snapshot_.live_double_registers.Count();
safepoint.SetNumPushedRegisters(pushed_reg_index + num_pushed_double_reg);
return safepoint;
}
MaglevSafepointTableBuilder::Safepoint DefineSafepointWithLazyDeopt(
LazyDeoptInfo* lazy_deopt_info) {
lazy_deopt_info->set_deopting_call_return_pc(
masm->pc_offset_for_safepoint());
masm->code_gen_state()->PushLazyDeopt(lazy_deopt_info);
return DefineSafepoint();
}
private:
MaglevAssembler* masm;
RegisterSnapshot snapshot_;
};
} // namespace maglev
} // namespace internal
} // namespace v8
#endif // V8_MAGLEV_MAGLEV_ASSEMBLER_H_
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