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Unified Diff: test/unittests/eh-frame-writer-unittest.cc

Issue 2023503002: Reland Implement .eh_frame writer and disassembler. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@eh-frame-base
Patch Set: Rebase on master. Created 4 years, 5 months ago
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Index: test/unittests/eh-frame-writer-unittest.cc
diff --git a/test/unittests/eh-frame-writer-unittest.cc b/test/unittests/eh-frame-writer-unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..24eeca45aa35a29b5bf937050dc5e1d9a3ccaf34
--- /dev/null
+++ b/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) %
+ 8);
+}
+
+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
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