dwarf2reader_cfi_unittest.cc - Android社区 - https://www.androidos.net.cn/

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// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>

// dwarf2reader_cfi_unittest.cc: Unit tests for dwarf2reader::CallFrameInfo

#include <stdlib.h>

#include <string>
#include <vector>

// The '.eh_frame' format, used by the Linux C++ ABI for exception
// handling, is poorly specified. To help test our support for .eh_frame,
// if you #define WRITE_ELF while compiling this file, and add the
// 'include' directory from the binutils, gcc, or gdb source tree to the
// #include path, then each test that calls the
// PERHAPS_WRITE_DEBUG_FRAME_FILE or PERHAPS_WRITE_EH_FRAME_FILE will write
// an ELF file containing a .debug_frame or .eh_frame section; you can then
// use tools like readelf to examine the test data, and check the tools'
// interpretation against the test's intentions. Each ELF file is named
// "cfitest-TEST", where TEST identifies the particular test.
#ifdef WRITE_ELF
#include <errno.h>
#include <stdio.h>
#include <string.h>
extern "C" {
// To compile with WRITE_ELF, you should add the 'include' directory
// of the binutils, gcc, or gdb source tree to your #include path;
// that directory contains this header.
#include "elf/common.h"
}
#endif

#include "breakpad_googletest_includes.h"
#include "common/dwarf/bytereader-inl.h"
#include "common/dwarf/cfi_assembler.h"
#include "common/dwarf/dwarf2reader.h"
#include "common/using_std_string.h"
#include "google_breakpad/common/breakpad_types.h"

using google_breakpad::CFISection;
using google_breakpad::test_assembler::Label;
using google_breakpad::test_assembler::kBigEndian;
using google_breakpad::test_assembler::kLittleEndian;
using google_breakpad::test_assembler::Section;

using dwarf2reader::DwarfPointerEncoding;
using dwarf2reader::ENDIANNESS_BIG;
using dwarf2reader::ENDIANNESS_LITTLE;
using dwarf2reader::ByteReader;
using dwarf2reader::CallFrameInfo;

using std::vector;
using testing::InSequence;
using testing::Return;
using testing::Sequence;
using testing::Test;
using testing::_;

#ifdef WRITE_ELF
void WriteELFFrameSection(const char *filename, const char *section_name,
                          const CFISection §ion);
#define PERHAPS_WRITE_DEBUG_FRAME_FILE(name, section)                   \
    WriteELFFrameSection("cfitest-" name, ".debug_frame", section);
#define PERHAPS_WRITE_EH_FRAME_FILE(name, section)                      \
    WriteELFFrameSection("cfitest-" name, ".eh_frame", section);
#else
#define PERHAPS_WRITE_DEBUG_FRAME_FILE(name, section)
#define PERHAPS_WRITE_EH_FRAME_FILE(name, section)
#endif

class MockCallFrameInfoHandler: public CallFrameInfo::Handler {
 public:
  MOCK_METHOD6(Entry, bool(size_t offset, uint64 address, uint64 length,
                           uint8 version, const string &augmentation,
                           unsigned return_address));
  MOCK_METHOD2(UndefinedRule, bool(uint64 address, int reg));
  MOCK_METHOD2(SameValueRule, bool(uint64 address, int reg));
  MOCK_METHOD4(OffsetRule, bool(uint64 address, int reg, int base_register,
                                long offset));
  MOCK_METHOD4(ValOffsetRule, bool(uint64 address, int reg, int base_register,
                                   long offset));
  MOCK_METHOD3(RegisterRule, bool(uint64 address, int reg, int base_register));
  MOCK_METHOD3(ExpressionRule, bool(uint64 address, int reg,
                                    const string &expression));
  MOCK_METHOD3(ValExpressionRule, bool(uint64 address, int reg,
                                       const string &expression));
  MOCK_METHOD0(End, bool());
  MOCK_METHOD2(PersonalityRoutine, bool(uint64 address, bool indirect));
  MOCK_METHOD2(LanguageSpecificDataArea, bool(uint64 address, bool indirect));
  MOCK_METHOD0(SignalHandler, bool());
};

class MockCallFrameErrorReporter: public CallFrameInfo::Reporter {
 public:
  MockCallFrameErrorReporter() : Reporter("mock filename", "mock section") { }
  MOCK_METHOD2(Incomplete, void(uint64, CallFrameInfo::EntryKind));
  MOCK_METHOD1(EarlyEHTerminator, void(uint64));
  MOCK_METHOD2(CIEPointerOutOfRange, void(uint64, uint64));
  MOCK_METHOD2(BadCIEId, void(uint64, uint64));
  MOCK_METHOD2(UnrecognizedVersion, void(uint64, int version));
  MOCK_METHOD2(UnrecognizedAugmentation, void(uint64, const string &));
  MOCK_METHOD2(InvalidPointerEncoding, void(uint64, uint8));
  MOCK_METHOD2(UnusablePointerEncoding, void(uint64, uint8));
  MOCK_METHOD2(RestoreInCIE, void(uint64, uint64));
  MOCK_METHOD3(BadInstruction, void(uint64, CallFrameInfo::EntryKind, uint64));
  MOCK_METHOD3(NoCFARule, void(uint64, CallFrameInfo::EntryKind, uint64));
  MOCK_METHOD3(EmptyStateStack, void(uint64, CallFrameInfo::EntryKind, uint64));
};

struct CFIFixture {

enum { kCFARegister = CallFrameInfo::Handler::kCFARegister };

CFIFixture() {
    // Default expectations for the data handler.
    //
    // - Leave Entry and End without expectations, as it's probably a
    //   good idea to set those explicitly in each test.
    //
    // - Expect the *Rule functions to not be called, 
    //   so that each test can simply list the calls they expect.
    //
    // I gather I could use StrictMock for this, but the manual seems
    // to suggest using that only as a last resort, and this isn't so
    // bad.
    EXPECT_CALL(handler, UndefinedRule(_, _)).Times(0);
    EXPECT_CALL(handler, SameValueRule(_, _)).Times(0);
    EXPECT_CALL(handler, OffsetRule(_, _, _, _)).Times(0);
    EXPECT_CALL(handler, ValOffsetRule(_, _, _, _)).Times(0);
    EXPECT_CALL(handler, RegisterRule(_, _, _)).Times(0);
    EXPECT_CALL(handler, ExpressionRule(_, _, _)).Times(0);
    EXPECT_CALL(handler, ValExpressionRule(_, _, _)).Times(0);
    EXPECT_CALL(handler, PersonalityRoutine(_, _)).Times(0);
    EXPECT_CALL(handler, LanguageSpecificDataArea(_, _)).Times(0);
    EXPECT_CALL(handler, SignalHandler()).Times(0);

// Default expectations for the error/warning reporer.
    EXPECT_CALL(reporter, Incomplete(_, _)).Times(0);
    EXPECT_CALL(reporter, EarlyEHTerminator(_)).Times(0);
    EXPECT_CALL(reporter, CIEPointerOutOfRange(_, _)).Times(0);
    EXPECT_CALL(reporter, BadCIEId(_, _)).Times(0);
    EXPECT_CALL(reporter, UnrecognizedVersion(_, _)).Times(0);
    EXPECT_CALL(reporter, UnrecognizedAugmentation(_, _)).Times(0);
    EXPECT_CALL(reporter, InvalidPointerEncoding(_, _)).Times(0);
    EXPECT_CALL(reporter, UnusablePointerEncoding(_, _)).Times(0);
    EXPECT_CALL(reporter, RestoreInCIE(_, _)).Times(0);
    EXPECT_CALL(reporter, BadInstruction(_, _, _)).Times(0);
    EXPECT_CALL(reporter, NoCFARule(_, _, _)).Times(0);
    EXPECT_CALL(reporter, EmptyStateStack(_, _, _)).Times(0);
  }

MockCallFrameInfoHandler handler;
  MockCallFrameErrorReporter reporter;
};

class CFI: public CFIFixture, public Test { };

TEST_F(CFI, EmptyRegion) {
  EXPECT_CALL(handler, Entry(_, _, _, _, _, _)).Times(0);
  EXPECT_CALL(handler, End()).Times(0);
  static const char data[1] = { 42 };

ByteReader byte_reader(ENDIANNESS_BIG);
  CallFrameInfo parser(data, 0, &byte_reader, &handler, &reporter);
  EXPECT_TRUE(parser.Start());
}

TEST_F(CFI, IncompleteLength32) {
  CFISection section(kBigEndian, 8);
  section
      // Not even long enough for an initial length.
      .D16(0xa0f)
      // Padding to keep valgrind happy. We subtract these off when we
      // construct the parser.
      .D16(0);