| //===-- DWARFExpressionTest.cpp -------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Expression/DWARFExpression.h" |
| #include "Plugins/TypeSystem/Clang/TypeSystemClang.h" |
| #include "TestingSupport/Symbol/YAMLModuleTester.h" |
| #include "lldb/Core/Value.h" |
| #include "lldb/Core/dwarf.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Utility/StreamString.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Testing/Support/Error.h" |
| #include "gtest/gtest.h" |
| |
| using namespace lldb_private; |
| |
| static llvm::Expected<Scalar> Evaluate(llvm::ArrayRef<uint8_t> expr, |
| lldb::ModuleSP module_sp = {}, |
| DWARFUnit *unit = nullptr) { |
| DataExtractor extractor(expr.data(), expr.size(), lldb::eByteOrderLittle, |
| /*addr_size*/ 4); |
| Value result; |
| Status status; |
| if (!DWARFExpression::Evaluate( |
| /*exe_ctx*/ nullptr, /*reg_ctx*/ nullptr, module_sp, extractor, unit, |
| lldb::eRegisterKindLLDB, |
| /*initial_value_ptr*/ nullptr, |
| /*object_address_ptr*/ nullptr, result, &status)) |
| return status.ToError(); |
| |
| switch (result.GetValueType()) { |
| case Value::eValueTypeScalar: |
| return result.GetScalar(); |
| case Value::eValueTypeHostAddress: { |
| // Convert small buffers to scalars to simplify the tests. |
| DataBufferHeap &buf = result.GetBuffer(); |
| if (buf.GetByteSize() <= 8) { |
| uint64_t val = 0; |
| memcpy(&val, buf.GetBytes(), buf.GetByteSize()); |
| return Scalar(llvm::APInt(buf.GetByteSize()*8, val, false)); |
| } |
| } |
| LLVM_FALLTHROUGH; |
| default: |
| return status.ToError(); |
| } |
| } |
| |
| class DWARFExpressionTester : public YAMLModuleTester { |
| public: |
| using YAMLModuleTester::YAMLModuleTester; |
| llvm::Expected<Scalar> Eval(llvm::ArrayRef<uint8_t> expr) { |
| return ::Evaluate(expr, m_module_sp, m_dwarf_unit.get()); |
| } |
| }; |
| |
| /// Unfortunately Scalar's operator==() is really picky. |
| static Scalar GetScalar(unsigned bits, uint64_t value, bool sign) { |
| Scalar scalar; |
| auto type = Scalar::GetBestTypeForBitSize(bits, sign); |
| switch (type) { |
| case Scalar::e_sint: |
| scalar = Scalar((int)value); |
| break; |
| case Scalar::e_slong: |
| scalar = Scalar((long)value); |
| break; |
| case Scalar::e_slonglong: |
| scalar = Scalar((long long)value); |
| break; |
| case Scalar::e_uint: |
| scalar = Scalar((unsigned int)value); |
| break; |
| case Scalar::e_ulong: |
| scalar = Scalar((unsigned long)value); |
| break; |
| case Scalar::e_ulonglong: |
| scalar = Scalar((unsigned long long)value); |
| break; |
| default: |
| llvm_unreachable("not implemented"); |
| } |
| scalar.TruncOrExtendTo(type, bits); |
| if (sign) |
| scalar.MakeSigned(); |
| else |
| scalar.MakeUnsigned(); |
| return scalar; |
| } |
| |
| TEST(DWARFExpression, DW_OP_pick) { |
| EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit1, DW_OP_lit0, DW_OP_pick, 0}), |
| llvm::HasValue(0)); |
| EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit1, DW_OP_lit0, DW_OP_pick, 1}), |
| llvm::HasValue(1)); |
| EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit1, DW_OP_lit0, DW_OP_pick, 2}), |
| llvm::Failed()); |
| } |
| |
| TEST(DWARFExpression, DW_OP_convert) { |
| /// Auxiliary debug info. |
| const char *yamldata = |
| "debug_abbrev:\n" |
| " - Code: 0x00000001\n" |
| " Tag: DW_TAG_compile_unit\n" |
| " Children: DW_CHILDREN_yes\n" |
| " Attributes:\n" |
| " - Attribute: DW_AT_language\n" |
| " Form: DW_FORM_data2\n" |
| " - Code: 0x00000002\n" |
| " Tag: DW_TAG_base_type\n" |
| " Children: DW_CHILDREN_no\n" |
| " Attributes:\n" |
| " - Attribute: DW_AT_encoding\n" |
| " Form: DW_FORM_data1\n" |
| " - Attribute: DW_AT_byte_size\n" |
| " Form: DW_FORM_data1\n" |
| "debug_info:\n" |
| " - Length:\n" |
| " TotalLength: 0\n" |
| " Version: 4\n" |
| " AbbrOffset: 0\n" |
| " AddrSize: 8\n" |
| " Entries:\n" |
| " - AbbrCode: 0x00000001\n" |
| " Values:\n" |
| " - Value: 0x000000000000000C\n" |
| // 0x0000000e: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x0000000000000007\n" // DW_ATE_unsigned |
| " - Value: 0x0000000000000004\n" |
| // 0x00000011: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x0000000000000007\n" // DW_ATE_unsigned |
| " - Value: 0x0000000000000008\n" |
| // 0x00000014: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x0000000000000005\n" // DW_ATE_signed |
| " - Value: 0x0000000000000008\n" |
| // 0x00000017: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x0000000000000008\n" // DW_ATE_unsigned_char |
| " - Value: 0x0000000000000001\n" |
| // 0x0000001a: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x0000000000000006\n" // DW_ATE_signed_char |
| " - Value: 0x0000000000000001\n" |
| // 0x0000001d: |
| " - AbbrCode: 0x00000002\n" |
| " Values:\n" |
| " - Value: 0x000000000000000b\n" // DW_ATE_numeric_string |
| " - Value: 0x0000000000000001\n" |
| "" |
| " - AbbrCode: 0x00000000\n" |
| " Values: []\n"; |
| uint8_t offs_uint32_t = 0x0000000e; |
| uint8_t offs_uint64_t = 0x00000011; |
| uint8_t offs_sint64_t = 0x00000014; |
| uint8_t offs_uchar = 0x00000017; |
| uint8_t offs_schar = 0x0000001a; |
| |
| DWARFExpressionTester t(yamldata, "i386-unknown-linux"); |
| ASSERT_TRUE((bool)t.GetDwarfUnit()); |
| |
| // Constant is given as little-endian. |
| bool is_signed = true; |
| bool not_signed = false; |
| |
| // |
| // Positive tests. |
| // |
| |
| // Truncate to default unspecified (pointer-sized) type. |
| EXPECT_THAT_EXPECTED( |
| t.Eval({DW_OP_const8u, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, // |
| DW_OP_convert, 0x00}), |
| llvm::HasValue(GetScalar(32, 0x44332211, not_signed))); |
| // Truncate to 32 bits. |
| EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const8u, // |
| 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,// |
| DW_OP_convert, offs_uint32_t}), |
| llvm::HasValue(GetScalar(32, 0x44332211, not_signed))); |
| |
| // Leave as is. |
| EXPECT_THAT_EXPECTED( |
| t.Eval({DW_OP_const8u, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, // |
| DW_OP_convert, offs_uint64_t}), |
| llvm::HasValue(GetScalar(64, 0x8877665544332211, not_signed))); |
| |
| // Sign-extend to 64 bits. |
| EXPECT_THAT_EXPECTED( |
| t.Eval({DW_OP_const4s, 0xcc, 0xdd, 0xee, 0xff, // |
| DW_OP_convert, offs_sint64_t}), |
| llvm::HasValue(GetScalar(64, 0xffffffffffeeddcc, is_signed))); |
| |
| // Truncate to 8 bits. |
| EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const4s, 'A', 'B', 'C', 'D', 0xee, 0xff, // |
| DW_OP_convert, offs_uchar}), |
| llvm::HasValue(GetScalar(8, 'A', not_signed))); |
| |
| // Also truncate to 8 bits. |
| EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const4s, 'A', 'B', 'C', 'D', 0xee, 0xff, // |
| DW_OP_convert, offs_schar}), |
| llvm::HasValue(GetScalar(8, 'A', is_signed))); |
| |
| // |
| // Errors. |
| // |
| |
| // No Module. |
| EXPECT_THAT_ERROR(Evaluate({DW_OP_const1s, 'X', DW_OP_convert, 0x00}, nullptr, |
| t.GetDwarfUnit().get()) |
| .takeError(), |
| llvm::Failed()); |
| |
| // No DIE. |
| EXPECT_THAT_ERROR( |
| t.Eval({DW_OP_const1s, 'X', DW_OP_convert, 0x01}).takeError(), |
| llvm::Failed()); |
| |
| // Unsupported. |
| EXPECT_THAT_ERROR( |
| t.Eval({DW_OP_const1s, 'X', DW_OP_convert, 0x1d}).takeError(), |
| llvm::Failed()); |
| } |
| |
| TEST(DWARFExpression, DW_OP_piece) { |
| EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const2u, 0x11, 0x22, DW_OP_piece, 2, |
| DW_OP_const2u, 0x33, 0x44, DW_OP_piece, 2}), |
| llvm::HasValue(GetScalar(32, 0x44332211, true))); |
| EXPECT_THAT_EXPECTED( |
| Evaluate({DW_OP_piece, 1, DW_OP_const1u, 0xff, DW_OP_piece, 1}), |
| // Note that the "00" should really be "undef", but we can't |
| // represent that yet. |
| llvm::HasValue(GetScalar(16, 0xff00, true))); |
| } |