1// Copyright 2019 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#include "src/codegen/code-desc.h"
6
7#include "src/codegen/assembler-inl.h"
8
9namespace v8 {
10namespace internal {
11
12// static
13void CodeDesc::Initialize(CodeDesc* desc, Assembler* assembler,
14                          int safepoint_table_offset, int handler_table_offset,
15                          int constant_pool_offset, int code_comments_offset,
16                          int reloc_info_offset) {
17  desc->buffer = assembler->buffer_start();
18  desc->buffer_size = assembler->buffer_size();
19  desc->instr_size = assembler->instruction_size();
20
21  desc->code_comments_offset = code_comments_offset;
22  desc->code_comments_size = desc->instr_size - code_comments_offset;
23
24  desc->constant_pool_offset = constant_pool_offset;
25  desc->constant_pool_size = desc->code_comments_offset - constant_pool_offset;
26
27  desc->handler_table_offset = handler_table_offset;
28  desc->handler_table_size = desc->constant_pool_offset - handler_table_offset;
29
30  desc->safepoint_table_offset = safepoint_table_offset;
31  desc->safepoint_table_size =
32      desc->handler_table_offset - safepoint_table_offset;
33
34  desc->reloc_offset = reloc_info_offset;
35  desc->reloc_size = desc->buffer_size - reloc_info_offset;
36
37  desc->unwinding_info_size = 0;
38  desc->unwinding_info = nullptr;
39
40  desc->origin = assembler;
41
42  CodeDesc::Verify(desc);
43}
44
45#ifdef DEBUG
46// static
47void CodeDesc::Verify(const CodeDesc* desc) {
48  // Zero-size code objects upset the system.
49  DCHECK_GT(desc->instr_size, 0);
50  DCHECK_NOT_NULL(desc->buffer);
51
52  // Instruction area layout invariants.
53  DCHECK_GE(desc->safepoint_table_size, 0);
54  DCHECK_EQ(desc->safepoint_table_size + desc->safepoint_table_offset,
55            desc->handler_table_offset);
56  DCHECK_GE(desc->handler_table_size, 0);
57  DCHECK_EQ(desc->handler_table_size + desc->handler_table_offset,
58            desc->constant_pool_offset);
59  DCHECK_GE(desc->constant_pool_size, 0);
60  DCHECK_EQ(desc->constant_pool_size + desc->constant_pool_offset,
61            desc->code_comments_offset);
62  DCHECK_GE(desc->code_comments_size, 0);
63  DCHECK_EQ(desc->code_comments_size + desc->code_comments_offset,
64            desc->instr_size);
65
66  DCHECK_GE(desc->reloc_offset, 0);
67  DCHECK_GE(desc->reloc_size, 0);
68  DCHECK_GE(desc->unwinding_info_size, 0);
69}
70#endif
71
72}  // namespace internal
73}  // namespace v8
74