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code-desc.cc
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73 lines (57 loc) · 2.41 KB
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// Copyright 2019 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.
#include "src/codegen/code-desc.h"
#include "src/codegen/assembler-inl.h"
namespace v8 {
namespace internal {
// static
void CodeDesc::Initialize(CodeDesc* desc, Assembler* assembler,
int safepoint_table_offset, int handler_table_offset,
int constant_pool_offset, int code_comments_offset,
int reloc_info_offset) {
desc->buffer = assembler->buffer_start();
desc->buffer_size = assembler->buffer_size();
desc->instr_size = assembler->instruction_size();
desc->code_comments_offset = code_comments_offset;
desc->code_comments_size = desc->instr_size - code_comments_offset;
desc->constant_pool_offset = constant_pool_offset;
desc->constant_pool_size = desc->code_comments_offset - constant_pool_offset;
desc->handler_table_offset = handler_table_offset;
desc->handler_table_size = desc->constant_pool_offset - handler_table_offset;
desc->safepoint_table_offset = safepoint_table_offset;
desc->safepoint_table_size =
desc->handler_table_offset - safepoint_table_offset;
desc->reloc_offset = reloc_info_offset;
desc->reloc_size = desc->buffer_size - reloc_info_offset;
desc->unwinding_info_size = 0;
desc->unwinding_info = nullptr;
desc->origin = assembler;
CodeDesc::Verify(desc);
}
#ifdef DEBUG
// static
void CodeDesc::Verify(const CodeDesc* desc) {
// Zero-size code objects upset the system.
DCHECK_GT(desc->instr_size, 0);
DCHECK_NOT_NULL(desc->buffer);
// Instruction area layout invariants.
DCHECK_GE(desc->safepoint_table_size, 0);
DCHECK_EQ(desc->safepoint_table_size + desc->safepoint_table_offset,
desc->handler_table_offset);
DCHECK_GE(desc->handler_table_size, 0);
DCHECK_EQ(desc->handler_table_size + desc->handler_table_offset,
desc->constant_pool_offset);
DCHECK_GE(desc->constant_pool_size, 0);
DCHECK_EQ(desc->constant_pool_size + desc->constant_pool_offset,
desc->code_comments_offset);
DCHECK_GE(desc->code_comments_size, 0);
DCHECK_EQ(desc->code_comments_size + desc->code_comments_offset,
desc->instr_size);
DCHECK_GE(desc->reloc_offset, 0);
DCHECK_GE(desc->reloc_size, 0);
DCHECK_GE(desc->unwinding_info_size, 0);
}
#endif
} // namespace internal
} // namespace v8