1 // Copyright 2021 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef V8_BASELINE_S390_BASELINE_COMPILER_S390_INL_H_
6 #define V8_BASELINE_S390_BASELINE_COMPILER_S390_INL_H_
7
8 #include "src/base/logging.h"
9 #include "src/baseline/baseline-compiler.h"
10
11 namespace v8 {
12 namespace internal {
13 namespace baseline {
14
15 #define __ basm_.
16
Prologue()17 void BaselineCompiler::Prologue() {
18 // Enter the frame here, since CallBuiltin will override lr.
19 __ masm()->EnterFrame(StackFrame::BASELINE);
20 DCHECK_EQ(kJSFunctionRegister, kJavaScriptCallTargetRegister);
21 int max_frame_size =
22 bytecode_->frame_size() + max_call_args_ * kSystemPointerSize;
23 CallBuiltin<Builtin::kBaselineOutOfLinePrologue>(
24 kContextRegister, kJSFunctionRegister, kJavaScriptCallArgCountRegister,
25 max_frame_size, kJavaScriptCallNewTargetRegister, bytecode_);
26
27 PrologueFillFrame();
28 }
29
PrologueFillFrame()30 void BaselineCompiler::PrologueFillFrame() {
31 ASM_CODE_COMMENT(&masm_);
32 // Inlined register frame fill
33 interpreter::Register new_target_or_generator_register =
34 bytecode_->incoming_new_target_or_generator_register();
35 if (FLAG_debug_code) {
36 __ masm()->CompareRoot(kInterpreterAccumulatorRegister,
37 RootIndex::kUndefinedValue);
38 __ masm()->Assert(eq, AbortReason::kUnexpectedValue);
39 }
40 int register_count = bytecode_->register_count();
41 // Magic value
42 const int kLoopUnrollSize = 8;
43 const int new_target_index = new_target_or_generator_register.index();
44 const bool has_new_target = new_target_index != kMaxInt;
45 if (has_new_target) {
46 DCHECK_LE(new_target_index, register_count);
47 for (int i = 0; i < new_target_index; i++) {
48 __ Push(kInterpreterAccumulatorRegister);
49 }
50 // Push new_target_or_generator.
51 __ Push(kJavaScriptCallNewTargetRegister);
52 register_count -= new_target_index + 1;
53 }
54 if (register_count < 2 * kLoopUnrollSize) {
55 // If the frame is small enough, just unroll the frame fill completely.
56 for (int i = 0; i < register_count; ++i) {
57 __ Push(kInterpreterAccumulatorRegister);
58 }
59
60 } else {
61 // Extract the first few registers to round to the unroll size.
62 int first_registers = register_count % kLoopUnrollSize;
63 for (int i = 0; i < first_registers; ++i) {
64 __ Push(kInterpreterAccumulatorRegister);
65 }
66 BaselineAssembler::ScratchRegisterScope temps(&basm_);
67 Register scratch = temps.AcquireScratch();
68
69 __ Move(scratch, register_count / kLoopUnrollSize);
70 // We enter the loop unconditionally, so make sure we need to loop at least
71 // once.
72 DCHECK_GT(register_count / kLoopUnrollSize, 0);
73 Label loop;
74 __ Bind(&loop);
75 for (int i = 0; i < kLoopUnrollSize; ++i) {
76 __ Push(kInterpreterAccumulatorRegister);
77 }
78 __ masm()->SubS64(scratch, Operand(1));
79 __ masm()->b(gt, &loop);
80 }
81 }
82
VerifyFrameSize()83 void BaselineCompiler::VerifyFrameSize() {
84 BaselineAssembler::ScratchRegisterScope temps(&basm_);
85 Register scratch = temps.AcquireScratch();
86
87 __ masm()->AddS64(scratch, sp,
88 Operand(InterpreterFrameConstants::kFixedFrameSizeFromFp +
89 bytecode_->frame_size()));
90 __ masm()->CmpU64(scratch, fp);
91 __ masm()->Assert(eq, AbortReason::kUnexpectedStackPointer);
92 }
93
94 } // namespace baseline
95 } // namespace internal
96 } // namespace v8
97
98 #endif // V8_BASELINE_S390_BASELINE_COMPILER_S390_INL_H_
99