code-layout-unittest.cc 3.93 KB
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// Copyright 2022 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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#include "src/execution/isolate.h"
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#include "src/heap/factory.h"
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#include "src/objects/objects-inl.h"
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#include "test/unittests/test-utils.h"
#include "testing/gtest/include/gtest/gtest.h"
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namespace v8 {
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using CodeLayoutTest = TestWithContext;

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namespace internal {
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TEST_F(CodeLayoutTest, CodeLayoutWithoutUnwindingInfo) {
  HandleScope handle_scope(i_isolate());
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  // "Hello, World!" in ASCII, padded to kCodeAlignment.
  byte buffer_array[16] = {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x57,
                           0x6F, 0x72, 0x6C, 0x64, 0x21, 0xcc, 0xcc, 0xcc};
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  byte* buffer = &buffer_array[0];
  int buffer_size = sizeof(buffer_array);

  CodeDesc code_desc;
  code_desc.buffer = buffer;
  code_desc.buffer_size = buffer_size;
  code_desc.instr_size = buffer_size;
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  code_desc.safepoint_table_offset = buffer_size;
  code_desc.safepoint_table_size = 0;
  code_desc.handler_table_offset = buffer_size;
  code_desc.handler_table_size = 0;
  code_desc.constant_pool_offset = buffer_size;
  code_desc.constant_pool_size = 0;
  code_desc.code_comments_offset = buffer_size;
  code_desc.code_comments_size = 0;
  code_desc.reloc_offset = buffer_size;
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  code_desc.reloc_size = 0;
  code_desc.unwinding_info = nullptr;
  code_desc.unwinding_info_size = 0;
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  code_desc.origin = nullptr;
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  Handle<Code> code =
      Factory::CodeBuilder(i_isolate(), code_desc, CodeKind::FOR_TESTING)
          .Build();
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  CHECK(!code->has_unwinding_info());
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  CHECK_EQ(code->raw_instruction_size(), buffer_size);
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  CHECK_EQ(0, memcmp(reinterpret_cast<void*>(code->raw_instruction_start()),
                     buffer, buffer_size));
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  CHECK_EQ(static_cast<int>(code->raw_instruction_end() -
                            code->raw_instruction_start()),
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           buffer_size);
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}

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TEST_F(CodeLayoutTest, CodeLayoutWithUnwindingInfo) {
  HandleScope handle_scope(i_isolate());
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  // "Hello, World!" in ASCII, padded to kCodeAlignment.
  byte buffer_array[16] = {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x57,
                           0x6F, 0x72, 0x6C, 0x64, 0x21, 0xcc, 0xcc, 0xcc};
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  // "JavaScript" in ASCII.
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  byte unwinding_info_array[10] = {0x4A, 0x61, 0x76, 0x61, 0x53,
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                                   0x63, 0x72, 0x69, 0x70, 0x74};

  byte* buffer = &buffer_array[0];
  int buffer_size = sizeof(buffer_array);
  byte* unwinding_info = &unwinding_info_array[0];
  int unwinding_info_size = sizeof(unwinding_info_array);

  CodeDesc code_desc;
  code_desc.buffer = buffer;
  code_desc.buffer_size = buffer_size;
  code_desc.instr_size = buffer_size;
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  code_desc.safepoint_table_offset = buffer_size;
  code_desc.safepoint_table_size = 0;
  code_desc.handler_table_offset = buffer_size;
  code_desc.handler_table_size = 0;
  code_desc.constant_pool_offset = buffer_size;
  code_desc.constant_pool_size = 0;
  code_desc.code_comments_offset = buffer_size;
  code_desc.code_comments_size = 0;
  code_desc.reloc_offset = buffer_size;
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  code_desc.reloc_size = 0;
  code_desc.unwinding_info = unwinding_info;
  code_desc.unwinding_info_size = unwinding_info_size;
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  code_desc.origin = nullptr;
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  Handle<Code> code =
      Factory::CodeBuilder(i_isolate(), code_desc, CodeKind::FOR_TESTING)
          .Build();
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  CHECK(code->has_unwinding_info());
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  CHECK_EQ(code->raw_body_size(), buffer_size + unwinding_info_size);
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  CHECK_EQ(0, memcmp(reinterpret_cast<void*>(code->raw_instruction_start()),
                     buffer, buffer_size));
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  CHECK_EQ(code->unwinding_info_size(), unwinding_info_size);
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  CHECK_EQ(memcmp(reinterpret_cast<void*>(code->unwinding_info_start()),
                  unwinding_info, unwinding_info_size),
           0);
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  CHECK_EQ(static_cast<int>(code->unwinding_info_end() -
                            code->raw_instruction_start()),
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           buffer_size + unwinding_info_size);
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}
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}  // namespace internal
}  // namespace v8