1 // Use of this source code is governed by a BSD-style license that can be
2 // Copyright 2021 the V8 project authors. All rights reserved.
3 // found in the LICENSE file.
4
5 #ifndef V8_BASELINE_IA32_BASELINE_COMPILER_IA32_INL_H_
6 #define V8_BASELINE_IA32_BASELINE_COMPILER_IA32_INL_H_
7
8 #include "src/base/macros.h"
9 #include "src/baseline/baseline-compiler.h"
10 #include "src/codegen/interface-descriptors.h"
11
12 namespace v8 {
13 namespace internal {
14 namespace baseline {
15
16 #define __ basm_.
17
Prologue()18 void BaselineCompiler::Prologue() {
19 DCHECK_EQ(kJSFunctionRegister, kJavaScriptCallTargetRegister);
20 int max_frame_size =
21 bytecode_->frame_size() + max_call_args_ * kSystemPointerSize;
22 CallBuiltin<Builtin::kBaselineOutOfLinePrologue>(
23 kContextRegister, kJSFunctionRegister, kJavaScriptCallArgCountRegister,
24 max_frame_size, kJavaScriptCallNewTargetRegister, bytecode_);
25
26 PrologueFillFrame();
27 }
28
PrologueFillFrame()29 void BaselineCompiler::PrologueFillFrame() {
30 ASM_CODE_COMMENT(&masm_);
31 // Inlined register frame fill
32 interpreter::Register new_target_or_generator_register =
33 bytecode_->incoming_new_target_or_generator_register();
34 if (FLAG_debug_code) {
35 __ masm()->CompareRoot(kInterpreterAccumulatorRegister,
36 RootIndex::kUndefinedValue);
37 __ masm()->Assert(equal, AbortReason::kUnexpectedValue);
38 }
39 int register_count = bytecode_->register_count();
40 // Magic value
41 const int kLoopUnrollSize = 8;
42 const int new_target_index = new_target_or_generator_register.index();
43 const bool has_new_target = new_target_index != kMaxInt;
44 if (has_new_target) {
45 DCHECK_LE(new_target_index, register_count);
46 for (int i = 0; i < new_target_index; i++) {
47 __ Push(kInterpreterAccumulatorRegister);
48 }
49 // Push new_target_or_generator.
50 __ Push(kJavaScriptCallNewTargetRegister);
51 register_count -= new_target_index + 1;
52 }
53 if (register_count < 2 * kLoopUnrollSize) {
54 // If the frame is small enough, just unroll the frame fill completely.
55 for (int i = 0; i < register_count; ++i) {
56 __ Push(kInterpreterAccumulatorRegister);
57 }
58 } else {
59 // Extract the first few registers to round to the unroll size.
60 int first_registers = register_count % kLoopUnrollSize;
61 for (int i = 0; i < first_registers; ++i) {
62 __ Push(kInterpreterAccumulatorRegister);
63 }
64 BaselineAssembler::ScratchRegisterScope scope(&basm_);
65 Register scratch = scope.AcquireScratch();
66 __ Move(scratch, register_count / kLoopUnrollSize);
67 // We enter the loop unconditionally, so make sure we need to loop at least
68 // once.
69 DCHECK_GT(register_count / kLoopUnrollSize, 0);
70 Label loop;
71 __ Bind(&loop);
72 for (int i = 0; i < kLoopUnrollSize; ++i) {
73 __ Push(kInterpreterAccumulatorRegister);
74 }
75 __ masm()->dec(scratch);
76 __ masm()->j(greater, &loop);
77 }
78 }
79
VerifyFrameSize()80 void BaselineCompiler::VerifyFrameSize() {
81 __ masm()->movd(xmm0, eax);
82 __ Move(eax, esp);
83 __ masm()->add(eax,
84 Immediate(InterpreterFrameConstants::kFixedFrameSizeFromFp +
85 bytecode_->frame_size()));
86 __ masm()->cmp(eax, ebp);
87 __ masm()->Assert(equal, AbortReason::kUnexpectedStackPointer);
88 __ masm()->movd(eax, xmm0);
89 }
90
91 #undef __
92
93 } // namespace baseline
94 } // namespace internal
95 } // namespace v8
96
97 #endif // V8_BASELINE_IA32_BASELINE_COMPILER_IA32_INL_H_
98