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// Copyright 2021 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_BASELINE_ARM64_BASELINE_COMPILER_ARM64_INL_H_
#define V8_BASELINE_ARM64_BASELINE_COMPILER_ARM64_INL_H_
#include "src/baseline/baseline-compiler.h"
namespace v8 {
namespace internal {
namespace baseline {
#define __ basm_.
void BaselineCompiler::Prologue() {
ASM_CODE_COMMENT(&masm_);
// Enter the frame here, since CallBuiltin will override lr.
__ masm()->EnterFrame(StackFrame::BASELINE);
DCHECK_EQ(kJSFunctionRegister, kJavaScriptCallTargetRegister);
int max_frame_size =
bytecode_->frame_size() + max_call_args_ * kSystemPointerSize;
CallBuiltin<Builtin::kBaselineOutOfLinePrologue>(
kContextRegister, kJSFunctionRegister, kJavaScriptCallArgCountRegister,
max_frame_size, kJavaScriptCallNewTargetRegister, bytecode_);
__ masm()->AssertSpAligned();
PrologueFillFrame();
__ masm()->AssertSpAligned();
}
void BaselineCompiler::PrologueFillFrame() {
ASM_CODE_COMMENT(&masm_);
// Inlined register frame fill
interpreter::Register new_target_or_generator_register =
bytecode_->incoming_new_target_or_generator_register();
if (FLAG_debug_code) {
__ masm()->CompareRoot(kInterpreterAccumulatorRegister,
RootIndex::kUndefinedValue);
__ masm()->Assert(eq, AbortReason::kUnexpectedValue);
}
int register_count = bytecode_->register_count();
// Magic value
const int kLoopUnrollSize = 8;
const int new_target_index = new_target_or_generator_register.index();
const bool has_new_target = new_target_index != kMaxInt;
// BaselineOutOfLinePrologue already pushed one undefined.
register_count -= 1;
if (has_new_target) {
if (new_target_index == 0) {
// Oops, need to fix up that undefined that BaselineOutOfLinePrologue
// pushed.
__ masm()->Poke(kJavaScriptCallNewTargetRegister, Operand(0));
} else {
DCHECK_LE(new_target_index, register_count);
int index = 1;
for (; index + 2 <= new_target_index; index += 2) {
__ masm()->Push(kInterpreterAccumulatorRegister,
kInterpreterAccumulatorRegister);
}
if (index == new_target_index) {
__ masm()->Push(kJavaScriptCallNewTargetRegister,
kInterpreterAccumulatorRegister);
} else {
DCHECK_EQ(index, new_target_index - 1);
__ masm()->Push(kInterpreterAccumulatorRegister,
kJavaScriptCallNewTargetRegister);
}
// We pushed "index" registers, minus the one the prologue pushed, plus
// the two registers that included new_target.
register_count -= (index - 1 + 2);
}
}
if (register_count < 2 * kLoopUnrollSize) {
// If the frame is small enough, just unroll the frame fill completely.
for (int i = 0; i < register_count; i += 2) {
__ masm()->Push(kInterpreterAccumulatorRegister,
kInterpreterAccumulatorRegister);
}
} else {
BaselineAssembler::ScratchRegisterScope temps(&basm_);
Register scratch = temps.AcquireScratch();
// Extract the first few registers to round to the unroll size.
int first_registers = register_count % kLoopUnrollSize;
for (int i = 0; i < first_registers; i += 2) {
__ masm()->Push(kInterpreterAccumulatorRegister,
kInterpreterAccumulatorRegister);
}
__ Move(scratch, register_count / kLoopUnrollSize);
// We enter the loop unconditionally, so make sure we need to loop at least
// once.
DCHECK_GT(register_count / kLoopUnrollSize, 0);
Label loop;
__ Bind(&loop);
for (int i = 0; i < kLoopUnrollSize; i += 2) {
__ masm()->Push(kInterpreterAccumulatorRegister,
kInterpreterAccumulatorRegister);
}
__ masm()->Subs(scratch, scratch, 1);
__ masm()->B(gt, &loop);
}
}
void BaselineCompiler::VerifyFrameSize() {
ASM_CODE_COMMENT(&masm_);
__ masm()->Add(x15, sp,
RoundUp(InterpreterFrameConstants::kFixedFrameSizeFromFp +
bytecode_->frame_size(),
2 * kSystemPointerSize));
__ masm()->Cmp(x15, fp);
__ masm()->Assert(eq, AbortReason::kUnexpectedStackPointer);
}
#undef __
} // namespace baseline
} // namespace internal
} // namespace v8
#endif // V8_BASELINE_ARM64_BASELINE_COMPILER_ARM64_INL_H_
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