v8/test/cctest/test-reloc-info.cc

// Copyright 2011 the V8 project authors. All rights reserved.
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#include "src/assembler.h"
#include "src/macro-assembler.h"
#include "test/cctest/cctest.h"

namespace v8 {
namespace internal {

static void WriteRinfo(RelocInfoWriter* writer,
                       byte* pc, RelocInfo::Mode mode, intptr_t data) {
  RelocInfo rinfo(CcTest::i_isolate(), pc, mode, data, NULL);
  writer->Write(&rinfo);
}


// Tests that writing both types of positions and then reading either
// or both works as expected.
TEST(Positions) {
  CcTest::InitializeVM();
  const int code_size = 10 * KB;
  int relocation_info_size = 10 * KB;
  const int buffer_size = code_size + relocation_info_size;
  v8::base::SmartArrayPointer<byte> buffer(new byte[buffer_size]);

  byte* pc = buffer.get();
  byte* buffer_end = buffer.get() + buffer_size;

  RelocInfoWriter writer(buffer_end, pc);
  byte* relocation_info_end = buffer_end - relocation_info_size;
  for (int i = 0, pos = 0; i < 100; i++, pc += i, pos += i) {
    RelocInfo::Mode mode = (i % 2 == 0) ?
        RelocInfo::STATEMENT_POSITION : RelocInfo::POSITION;
    if (mode == RelocInfo::STATEMENT_POSITION) {
      printf("TEST WRITING STATEMENT %p %d\n", static_cast<void*>(pc), pos);
    } else {
      printf("TEST WRITING POSITION %p %d\n", static_cast<void*>(pc), pos);
    }
    WriteRinfo(&writer, pc, mode, pos);
    CHECK(writer.pos() - RelocInfoWriter::kMaxSize >= relocation_info_end);
  }

  writer.Finish();
  relocation_info_size = static_cast<int>(buffer_end - writer.pos());
  MacroAssembler assm(CcTest::i_isolate(), nullptr, 0, CodeObjectRequired::kNo);
  CodeDesc desc = {
      buffer.get(), buffer_size, code_size, relocation_info_size, 0,
      nullptr,      0,           &assm};

  // Read only (non-statement) positions.
  {
    RelocIterator it(desc, RelocInfo::ModeMask(RelocInfo::POSITION));
    pc = buffer.get();
    for (int i = 0, pos = 0; i < 100; i++, pc += i, pos += i) {
      printf("TESTING 1: %d\n", i);
      RelocInfo::Mode mode = (i % 2 == 0) ?
          RelocInfo::STATEMENT_POSITION : RelocInfo::POSITION;
      if (mode == RelocInfo::POSITION) {
        CHECK_EQ(pc, it.rinfo()->pc());
        CHECK_EQ(mode, it.rinfo()->rmode());
        CHECK_EQ(pos, static_cast<int>(it.rinfo()->data()));
        it.next();
      }
    }
    CHECK(it.done());
  }

  // Read only statement positions.
  {
    RelocIterator it(desc, RelocInfo::ModeMask(RelocInfo::STATEMENT_POSITION));
    pc = buffer.get();
    for (int i = 0, pos = 0; i < 100; i++, pc += i, pos += i) {
      RelocInfo::Mode mode = (i % 2 == 0) ?
          RelocInfo::STATEMENT_POSITION : RelocInfo::POSITION;
      if (mode == RelocInfo::STATEMENT_POSITION) {
        CHECK_EQ(pc, it.rinfo()->pc());
        CHECK_EQ(mode, it.rinfo()->rmode());
        CHECK_EQ(pos, static_cast<int>(it.rinfo()->data()));
        it.next();
      }
    }
    CHECK(it.done());
  }

  // Read both types of positions.
  {
    RelocIterator it(desc, RelocInfo::kPositionMask);
    pc = buffer.get();
    for (int i = 0, pos = 0; i < 100; i++, pc += i, pos += i) {
      RelocInfo::Mode mode = (i % 2 == 0) ?
          RelocInfo::STATEMENT_POSITION : RelocInfo::POSITION;
      CHECK_EQ(pc, it.rinfo()->pc());
      CHECK_EQ(mode, it.rinfo()->rmode());
      CHECK_EQ(pos, static_cast<int>(it.rinfo()->data()));
      it.next();
    }
    CHECK(it.done());
  }
}

}  // namespace internal
}  // namespace v8