diff options
Diffstat (limited to 'deps/v8/test/unittests/eh-frame-writer-unittest.cc')
| -rw-r--r-- | deps/v8/test/unittests/eh-frame-writer-unittest.cc | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/deps/v8/test/unittests/eh-frame-writer-unittest.cc b/deps/v8/test/unittests/eh-frame-writer-unittest.cc new file mode 100644 index 0000000000..98503986aa --- /dev/null +++ b/deps/v8/test/unittests/eh-frame-writer-unittest.cc @@ -0,0 +1,464 @@ +// Copyright 2016 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/eh-frame.h" +#include "test/unittests/test-utils.h" + +// Test enabled only on supported architectures. +#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM) || \ + defined(V8_TARGET_ARCH_ARM64) + +using namespace v8::internal; + +namespace { + +class EhFrameWriterTest : public TestWithZone { + protected: + // Being a 7bit positive integer, this also serves as its ULEB128 encoding. + static const int kTestRegisterCode = 0; + + static EhFrameIterator MakeIterator(EhFrameWriter* writer) { + CodeDesc desc; + writer->GetEhFrame(&desc); + DCHECK_GT(desc.unwinding_info_size, 0); + return EhFrameIterator(desc.unwinding_info, + desc.unwinding_info + desc.unwinding_info_size); + } +}; + +const int EhFrameWriterTest::kTestRegisterCode; + +} // namespace + +TEST_F(EhFrameWriterTest, Alignment) { + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(42 * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + ASSERT_EQ(0, EhFrameConstants::kEhFrameHdrSize % 4); + ASSERT_EQ(0, EhFrameConstants::kEhFrameTerminatorSize % 4); + EXPECT_EQ(0, (iterator.GetBufferSize() - EhFrameConstants::kEhFrameHdrSize - + EhFrameConstants::kEhFrameTerminatorSize) % + kPointerSize); +} + +TEST_F(EhFrameWriterTest, FDEHeader) { + static const int kProcedureSize = 0x5678abcd; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.Finish(kProcedureSize); + + EhFrameIterator iterator = MakeIterator(&writer); + int cie_size = iterator.GetNextUInt32(); + iterator.Skip(cie_size); + + int fde_size = iterator.GetNextUInt32(); + EXPECT_EQ(iterator.GetBufferSize(), + fde_size + cie_size + EhFrameConstants::kEhFrameTerminatorSize + + EhFrameConstants::kEhFrameHdrSize + 2 * kInt32Size); + + int backwards_offset_to_cie_offset = iterator.GetCurrentOffset(); + int backwards_offset_to_cie = iterator.GetNextUInt32(); + EXPECT_EQ(backwards_offset_to_cie_offset, backwards_offset_to_cie); + + int procedure_address_offset = iterator.GetCurrentOffset(); + int procedure_address = iterator.GetNextUInt32(); + EXPECT_EQ(-(procedure_address_offset + RoundUp(kProcedureSize, 8)), + procedure_address); + + int procedure_size = iterator.GetNextUInt32(); + EXPECT_EQ(kProcedureSize, procedure_size); +} + +TEST_F(EhFrameWriterTest, SetOffset) { + static const int kOffset = 0x0badc0de; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.SetBaseAddressOffset(kOffset); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset, + iterator.GetNextOpcode()); + EXPECT_EQ(kOffset, iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, IncreaseOffset) { + static const int kFirstOffset = 121; + static const int kSecondOffset = 16; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.SetBaseAddressOffset(kFirstOffset); + writer.IncreaseBaseAddressOffset(kSecondOffset); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset, + iterator.GetNextOpcode()); + EXPECT_EQ(kFirstOffset, iterator.GetNextULeb128()); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset, + iterator.GetNextOpcode()); + EXPECT_EQ(kFirstOffset + kSecondOffset, iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, SetRegister) { + Register test_register = Register::from_code(kTestRegisterCode); + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.SetBaseAddressRegister(test_register); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaRegister, + iterator.GetNextOpcode()); + EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, SetRegisterAndOffset) { + Register test_register = Register::from_code(kTestRegisterCode); + static const int kOffset = 0x0badc0de; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.SetBaseAddressRegisterAndOffset(test_register, kOffset); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfa, iterator.GetNextOpcode()); + EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128()); + EXPECT_EQ(kOffset, iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding6bit) { + static const int kOffset = 42; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ((1 << 6) | kOffset, iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding6bitDelta) { + static const int kFirstOffset = 42; + static const int kSecondOffset = 62; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.AdvanceLocation(kSecondOffset * + EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte()); + EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding8bit) { + static const int kOffset = 0x42; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1, + iterator.GetNextOpcode()); + EXPECT_EQ(kOffset, iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding8bitDelta) { + static const int kFirstOffset = 0x10; + static const int kSecondOffset = 0x70; + static const int kThirdOffset = 0xb5; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.AdvanceLocation(kSecondOffset * + EhFrameConstants::kCodeAlignmentFactor); + writer.AdvanceLocation(kThirdOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte()); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1, + iterator.GetNextOpcode()); + EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextByte()); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1, + iterator.GetNextOpcode()); + EXPECT_EQ(kThirdOffset - kSecondOffset, iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding16bit) { + static const int kOffset = kMaxUInt8 + 42; + ASSERT_LT(kOffset, kMaxUInt16); + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2, + iterator.GetNextOpcode()); + EXPECT_EQ(kOffset, iterator.GetNextUInt16()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding16bitDelta) { + static const int kFirstOffset = 0x41; + static const int kSecondOffset = kMaxUInt8 + 0x42; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.AdvanceLocation(kSecondOffset * + EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1, + iterator.GetNextOpcode()); + EXPECT_EQ(kFirstOffset, iterator.GetNextByte()); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2, + iterator.GetNextOpcode()); + EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextUInt16()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding32bit) { + static const int kOffset = kMaxUInt16 + 42; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4, + iterator.GetNextOpcode()); + EXPECT_EQ(kOffset, iterator.GetNextUInt32()); +} + +TEST_F(EhFrameWriterTest, PcOffsetEncoding32bitDelta) { + static const int kFirstOffset = kMaxUInt16 + 0x42; + static const int kSecondOffset = kMaxUInt16 + 0x67; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor); + writer.AdvanceLocation(kSecondOffset * + EhFrameConstants::kCodeAlignmentFactor); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4, + iterator.GetNextOpcode()); + EXPECT_EQ(kFirstOffset, iterator.GetNextUInt32()); + + EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, SaveRegisterUnsignedOffset) { + Register test_register = Register::from_code(kTestRegisterCode); + static const int kOffset = + EhFrameConstants::kDataAlignmentFactor > 0 ? 12344 : -12344; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.RecordRegisterSavedToStack(test_register, kOffset); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ((2 << 6) | kTestRegisterCode, iterator.GetNextByte()); + EXPECT_EQ(kOffset / EhFrameConstants::kDataAlignmentFactor, + iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, SaveRegisterSignedOffset) { + Register test_register = Register::from_code(kTestRegisterCode); + static const int kOffset = + EhFrameConstants::kDataAlignmentFactor < 0 ? 12344 : -12344; + + ASSERT_EQ(kOffset % EhFrameConstants::kDataAlignmentFactor, 0); + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.RecordRegisterSavedToStack(test_register, kOffset); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kOffsetExtendedSf, + iterator.GetNextOpcode()); + EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128()); + EXPECT_EQ(kOffset / EhFrameConstants::kDataAlignmentFactor, + iterator.GetNextSLeb128()); +} + +TEST_F(EhFrameWriterTest, RegisterNotModified) { + Register test_register = Register::from_code(kTestRegisterCode); + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.RecordRegisterNotModified(test_register); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kSameValue, + iterator.GetNextOpcode()); + EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128()); +} + +TEST_F(EhFrameWriterTest, RegisterFollowsInitialRule) { + Register test_register = Register::from_code(kTestRegisterCode); + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.RecordRegisterFollowsInitialRule(test_register); + writer.Finish(100); + + EhFrameIterator iterator = MakeIterator(&writer); + iterator.SkipToFdeDirectives(); + + EXPECT_EQ((3 << 6) | kTestRegisterCode, iterator.GetNextByte()); +} + +TEST_F(EhFrameWriterTest, EhFrameHdrLayout) { + static const int kCodeSize = 10; + static const int kPaddingSize = 6; + + EhFrameWriter writer(zone()); + writer.Initialize(); + writer.Finish(kCodeSize); + + EhFrameIterator iterator = MakeIterator(&writer); + + // Skip the .eh_frame. + + int encoded_cie_size = iterator.GetNextUInt32(); + iterator.Skip(encoded_cie_size); + int cie_size = encoded_cie_size + kInt32Size; + + int encoded_fde_size = iterator.GetNextUInt32(); + iterator.Skip(encoded_fde_size); + int fde_size = encoded_fde_size + kInt32Size; + + iterator.Skip(EhFrameConstants::kEhFrameTerminatorSize); + + int eh_frame_size = + cie_size + fde_size + EhFrameConstants::kEhFrameTerminatorSize; + + // + // Plugging some numbers in the DSO layout shown in eh-frame.cc: + // + // | ... | + // +---------------+ <-- (E) --------- + // | | ^ + // | Instructions | 10 bytes | .text + // | | v + // +---------------+ <---------------- + // |///////////////| + // |////Padding////| 6 bytes + // |///////////////| + // +---------------+ <---(D)---------- + // | | ^ + // | CIE | cie_size bytes* | + // | | | + // +---------------+ <-- (C) | + // | | | .eh_frame + // | FDE | fde_size bytes | + // | | | + // +---------------+ | + // | terminator | 4 bytes v + // +---------------+ <-- (B) --------- + // | version | ^ + // +---------------+ 4 bytes | + // | encoding | | + // | specifiers | | + // +---------------+ <---(A) | .eh_frame_hdr + // | offset to | | + // | .eh_frame | | + // +---------------+ | + // | ... | ... + // + // (*) the size of the CIE is platform dependent. + // + + int eh_frame_hdr_version = iterator.GetNextByte(); + EXPECT_EQ(EhFrameConstants::kEhFrameHdrVersion, eh_frame_hdr_version); + + // .eh_frame pointer encoding specifier. + EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel, + iterator.GetNextByte()); + + // Lookup table size encoding specifier. + EXPECT_EQ(EhFrameConstants::kUData4, iterator.GetNextByte()); + + // Lookup table pointers encoding specifier. + EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kDataRel, + iterator.GetNextByte()); + + // A -> D + int offset_to_eh_frame = iterator.GetNextUInt32(); + EXPECT_EQ(-(EhFrameConstants::kFdeVersionSize + + EhFrameConstants::kFdeEncodingSpecifiersSize + eh_frame_size), + offset_to_eh_frame); + + int lut_entries = iterator.GetNextUInt32(); + EXPECT_EQ(1, lut_entries); + + // B -> E + int offset_to_procedure = iterator.GetNextUInt32(); + EXPECT_EQ(-(eh_frame_size + kPaddingSize + kCodeSize), offset_to_procedure); + + // B -> C + int offset_to_fde = iterator.GetNextUInt32(); + EXPECT_EQ(-(fde_size + EhFrameConstants::kEhFrameTerminatorSize), + offset_to_fde); +} + +#endif |