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RedBear-OS/local/recipes/dev/libclc/source/lldb/unittests/Expression/DWARFExpressionTest.cpp
T
vasilito cb424d7448 build: static patch-sanity linter (shift-left the malformed-patch class) 
verify-patch-sanity.py validates every active recipe .patch has internally-
consistent hunk line counts — catching the 'malformed patch at line N' failure
at commit/CI/preflight time instead of hours into a cook. This cycle hit that
class three times (qtwaylandscanner, sddm, xwayland), each only discovered when
cookbook tried to apply the patch.

Running it across the repo found 29 latent malformed patches (validated against
GNU patch: e.g. relibc/P3-sysv-ipc reproduces 'malformed patch at line 22').
They were harmless only because they sit in vendored recipes (baked, not re-
applied) — but would fail on any version-bump re-derivation. --fix recounts the
hunk headers (body untouched) and repaired all 29.

Wired into build-preflight.sh (Phase 1.0D) and redbear-ci.yml, with a unit test
(test-patch-sanity.sh). Skips archived/legacy trees and unvalidatable formats
(empty placeholders, bare-@@ git hunks).
2026-08-01 05:13:02 +03:00

841 lines
29 KiB
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//===-- 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/Platform/Linux/PlatformLinux.h"
#include "Plugins/SymbolFile/DWARF/DWARFDebugInfo.h"
#include "Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.h"
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
#include "TestingSupport/Symbol/YAMLModuleTester.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/dwarf.h"
#include "lldb/Host/HostInfo.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;
using namespace lldb_private::dwarf;
using namespace lldb_private::plugin::dwarf;
static llvm::Expected<Scalar> Evaluate(llvm::ArrayRef<uint8_t> expr,
lldb::ModuleSP module_sp = {},
DWARFUnit *unit = nullptr,
ExecutionContext *exe_ctx = nullptr) {
DataExtractor extractor(expr.data(), expr.size(), lldb::eByteOrderLittle,
/*addr_size*/ 4);
llvm::Expected<Value> result =
DWARFExpression::Evaluate(exe_ctx, /*reg_ctx*/ nullptr, module_sp,
extractor, unit, lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
/*object_address_ptr*/ nullptr);
if (!result)
return result.takeError();
switch (result->GetValueType()) {
case Value::ValueType::Scalar:
return result->GetScalar();
case Value::ValueType::LoadAddress:
return LLDB_INVALID_ADDRESS;
case Value::ValueType::HostAddress: {
// 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));
}
}
[[fallthrough]];
default:
break;
}
return llvm::createStringError("unsupported value type");
}
class DWARFExpressionTester : public YAMLModuleTester {
public:
DWARFExpressionTester(llvm::StringRef yaml_data, size_t cu_index) :
YAMLModuleTester(yaml_data, cu_index) {}
using YAMLModuleTester::YAMLModuleTester;
llvm::Expected<Scalar> Eval(llvm::ArrayRef<uint8_t> expr) {
return ::Evaluate(expr, m_module_sp, m_dwarf_unit);
}
};
/// Unfortunately Scalar's operator==() is really picky.
static Scalar GetScalar(unsigned bits, uint64_t value, bool sign) {
Scalar scalar(value);
scalar.TruncOrExtendTo(bits, sign);
return scalar;
}
/// This is needed for the tests that use a mock process.
class DWARFExpressionMockProcessTest : public ::testing::Test {
public:
void SetUp() override {
FileSystem::Initialize();
HostInfo::Initialize();
platform_linux::PlatformLinux::Initialize();
}
void TearDown() override {
platform_linux::PlatformLinux::Terminate();
HostInfo::Terminate();
FileSystem::Terminate();
}
};
// NB: This class doesn't use the override keyword to avoid
// -Winconsistent-missing-override warnings from the compiler. The
// inconsistency comes from the overriding definitions in the MOCK_*** macros.
class MockTarget : public Target {
public:
MockTarget(Debugger &debugger, const ArchSpec &target_arch,
const lldb::PlatformSP &platform_sp)
: Target(debugger, target_arch, platform_sp, true) {}
MOCK_METHOD2(ReadMemory,
llvm::Expected<std::vector<uint8_t>>(lldb::addr_t addr,
size_t size));
size_t ReadMemory(const Address &addr, void *dst, size_t dst_len,
Status &error, bool force_live_memory = false,
lldb::addr_t *load_addr_ptr = nullptr) /*override*/ {
auto expected_memory = this->ReadMemory(addr.GetOffset(), dst_len);
if (!expected_memory) {
llvm::consumeError(expected_memory.takeError());
return 0;
}
const size_t bytes_read = expected_memory->size();
assert(bytes_read <= dst_len);
std::memcpy(dst, expected_memory->data(), bytes_read);
return bytes_read;
}
};
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_const) {
// Extend to address size.
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const1u, 0x88}), llvm::HasValue(0x88));
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const1s, 0x88}),
llvm::HasValue(0xffffff88));
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const2u, 0x47, 0x88}),
llvm::HasValue(0x8847));
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const2s, 0x47, 0x88}),
llvm::HasValue(0xffff8847));
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const4u, 0x44, 0x42, 0x47, 0x88}),
llvm::HasValue(0x88474244));
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const4s, 0x44, 0x42, 0x47, 0x88}),
llvm::HasValue(0x88474244));
// Truncate to address size.
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_const8u, 0x00, 0x11, 0x22, 0x33, 0x44, 0x42, 0x47, 0x88}),
llvm::HasValue(0x33221100));
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_const8s, 0x00, 0x11, 0x22, 0x33, 0x44, 0x42, 0x47, 0x88}),
llvm::HasValue(0x33221100));
// Don't truncate to address size for compatibility with clang (pr48087).
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_constu, 0x81, 0x82, 0x84, 0x88, 0x90, 0xa0, 0x40}),
llvm::HasValue(0x01010101010101));
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_consts, 0x81, 0x82, 0x84, 0x88, 0x90, 0xa0, 0x40}),
llvm::HasValue(0xffff010101010101));
}
TEST(DWARFExpression, DW_OP_skip) {
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_const1u, 0x42, DW_OP_skip, 0x02, 0x00,
DW_OP_const1u, 0xff}),
llvm::HasValue(0x42));
}
TEST(DWARFExpression, DW_OP_bra) {
EXPECT_THAT_EXPECTED(
// clang-format off
Evaluate({
DW_OP_const1u, 0x42, // push 0x42
DW_OP_const1u, 0x1, // push 0x1
DW_OP_bra, 0x02, 0x00, // if 0x1 > 0, then skip 0x0002 opcodes
DW_OP_const1u, 0xff, // push 0xff
}),
// clang-format on
llvm::HasValue(0x42));
EXPECT_THAT_ERROR(Evaluate({DW_OP_bra, 0x01, 0x00}).takeError(),
llvm::Failed());
}
TEST(DWARFExpression, DW_OP_convert) {
/// Auxiliary debug info.
const char *yamldata = R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_386
DWARF:
debug_abbrev:
- Table:
- Code: 0x00000001
Tag: DW_TAG_compile_unit
Children: DW_CHILDREN_yes
Attributes:
- Attribute: DW_AT_language
Form: DW_FORM_data2
- Code: 0x00000002
Tag: DW_TAG_base_type
Children: DW_CHILDREN_no
Attributes:
- Attribute: DW_AT_encoding
Form: DW_FORM_data1
- Attribute: DW_AT_byte_size
Form: DW_FORM_data1
debug_info:
- Version: 4
AddrSize: 8
AbbrevTableID: 0
AbbrOffset: 0x0
Entries:
- AbbrCode: 0x00000001
Values:
- Value: 0x000000000000000C
- AbbrCode: 0x00000000
- Version: 4
AddrSize: 8
AbbrevTableID: 0
AbbrOffset: 0x0
Entries:
- AbbrCode: 0x00000001
Values:
- Value: 0x000000000000000C
# 0x0000000e:
- AbbrCode: 0x00000002
Values:
- Value: 0x0000000000000007 # DW_ATE_unsigned
- Value: 0x0000000000000004
# 0x00000011:
- AbbrCode: 0x00000002
Values:
- Value: 0x0000000000000007 # DW_ATE_unsigned
- Value: 0x0000000000000008
# 0x00000014:
- AbbrCode: 0x00000002
Values:
- Value: 0x0000000000000005 # DW_ATE_signed
- Value: 0x0000000000000008
# 0x00000017:
- AbbrCode: 0x00000002
Values:
- Value: 0x0000000000000008 # DW_ATE_unsigned_char
- Value: 0x0000000000000001
# 0x0000001a:
- AbbrCode: 0x00000002
Values:
- Value: 0x0000000000000006 # DW_ATE_signed_char
- Value: 0x0000000000000001
# 0x0000001d:
- AbbrCode: 0x00000002
Values:
- Value: 0x000000000000000b # DW_ATE_numeric_string
- Value: 0x0000000000000001
- AbbrCode: 0x00000000
)";
// Compile unit relative offsets to each DW_TAG_base_type
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, /*cu_index=*/1);
ASSERT_TRUE((bool)t.GetDwarfUnit());
// Constant is given as little-endian.
bool is_signed = true;
bool not_signed = false;
//
// Positive tests.
//
// Leave as is.
EXPECT_THAT_EXPECTED(
t.Eval({DW_OP_const4u, 0x11, 0x22, 0x33, 0x44, //
DW_OP_convert, offs_uint32_t, DW_OP_stack_value}),
llvm::HasValue(GetScalar(64, 0x44332211, not_signed)));
// Zero-extend to 64 bits.
EXPECT_THAT_EXPECTED(
t.Eval({DW_OP_const4u, 0x11, 0x22, 0x33, 0x44, //
DW_OP_convert, offs_uint64_t, DW_OP_stack_value}),
llvm::HasValue(GetScalar(64, 0x44332211, 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, DW_OP_stack_value}),
llvm::HasValue(GetScalar(64, 0xffffffffffeeddcc, is_signed)));
// Sign-extend, then truncate.
EXPECT_THAT_EXPECTED(
t.Eval({DW_OP_const4s, 0xcc, 0xdd, 0xee, 0xff, //
DW_OP_convert, offs_sint64_t, //
DW_OP_convert, offs_uint32_t, DW_OP_stack_value}),
llvm::HasValue(GetScalar(32, 0xffeeddcc, not_signed)));
// Truncate to default unspecified (pointer-sized) type.
EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const4s, 0xcc, 0xdd, 0xee, 0xff, //
DW_OP_convert, offs_sint64_t, //
DW_OP_convert, 0x00, DW_OP_stack_value}),
llvm::HasValue(GetScalar(32, 0xffeeddcc, not_signed)));
// Truncate to 8 bits.
EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const4s, 'A', 'B', 'C', 'D', DW_OP_convert,
offs_uchar, DW_OP_stack_value}),
llvm::HasValue(GetScalar(8, 'A', not_signed)));
// Also truncate to 8 bits.
EXPECT_THAT_EXPECTED(t.Eval({DW_OP_const4s, 'A', 'B', 'C', 'D', DW_OP_convert,
offs_schar, DW_OP_stack_value}),
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())
.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_stack_value) {
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_stack_value}), 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)));
}
TEST(DWARFExpression, DW_OP_implicit_value) {
unsigned char bytes = 4;
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_implicit_value, bytes, 0x11, 0x22, 0x33, 0x44}),
llvm::HasValue(GetScalar(8 * bytes, 0x44332211, true)));
}
TEST(DWARFExpression, DW_OP_unknown) {
EXPECT_THAT_EXPECTED(
Evaluate({0xff}),
llvm::FailedWithMessage(
"Unhandled opcode DW_OP_unknown_ff in DWARFExpression"));
}
TEST_F(DWARFExpressionMockProcessTest, DW_OP_deref) {
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit0, DW_OP_deref}), llvm::Failed());
struct MockProcess : Process {
MockProcess(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp)
: Process(target_sp, listener_sp) {}
llvm::StringRef GetPluginName() override { return "mock process"; }
bool CanDebug(lldb::TargetSP target,
bool plugin_specified_by_name) override {
return false;
};
Status DoDestroy() override { return {}; }
void RefreshStateAfterStop() override {}
bool DoUpdateThreadList(ThreadList &old_thread_list,
ThreadList &new_thread_list) override {
return false;
};
size_t DoReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
Status &error) override {
for (size_t i = 0; i < size; ++i)
((char *)buf)[i] = (vm_addr + i) & 0xff;
error.Clear();
return size;
}
};
// Set up a mock process.
ArchSpec arch("i386-pc-linux");
Platform::SetHostPlatform(
platform_linux::PlatformLinux::CreateInstance(true, &arch));
lldb::DebuggerSP debugger_sp = Debugger::CreateInstance();
ASSERT_TRUE(debugger_sp);
lldb::TargetSP target_sp;
lldb::PlatformSP platform_sp;
debugger_sp->GetTargetList().CreateTarget(
*debugger_sp, "", arch, eLoadDependentsNo, platform_sp, target_sp);
ASSERT_TRUE(target_sp);
ASSERT_TRUE(target_sp->GetArchitecture().IsValid());
ASSERT_TRUE(platform_sp);
lldb::ListenerSP listener_sp(Listener::MakeListener("dummy"));
lldb::ProcessSP process_sp =
std::make_shared<MockProcess>(target_sp, listener_sp);
ASSERT_TRUE(process_sp);
ExecutionContext exe_ctx(process_sp);
// Implicit location: *0x4.
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit4, DW_OP_deref, DW_OP_stack_value},
{}, {}, &exe_ctx),
llvm::HasValue(GetScalar(32, 0x07060504, false)));
// Memory location: *(*0x4).
// Evaluate returns LLDB_INVALID_ADDRESS for all load addresses.
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit4, DW_OP_deref}, {}, {}, &exe_ctx),
llvm::HasValue(Scalar(LLDB_INVALID_ADDRESS)));
// Memory location: *0x4.
// Evaluate returns LLDB_INVALID_ADDRESS for all load addresses.
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_lit4}, {}, {}, &exe_ctx),
llvm::HasValue(Scalar(4)));
// Implicit location: *0x4.
// Evaluate returns LLDB_INVALID_ADDRESS for all load addresses.
EXPECT_THAT_EXPECTED(
Evaluate({DW_OP_lit4, DW_OP_deref, DW_OP_stack_value}, {}, {}, &exe_ctx),
llvm::HasValue(GetScalar(32, 0x07060504, false)));
}
TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr) {
// Set up a wasm target
ArchSpec arch("wasm32-unknown-unknown-wasm");
lldb::PlatformSP host_platform_sp =
platform_linux::PlatformLinux::CreateInstance(true, &arch);
ASSERT_TRUE(host_platform_sp);
Platform::SetHostPlatform(host_platform_sp);
lldb::DebuggerSP debugger_sp = Debugger::CreateInstance();
ASSERT_TRUE(debugger_sp);
lldb::TargetSP target_sp;
lldb::PlatformSP platform_sp;
debugger_sp->GetTargetList().CreateTarget(*debugger_sp, "", arch,
lldb_private::eLoadDependentsNo,
platform_sp, target_sp);
ExecutionContext exe_ctx(target_sp, false);
// DW_OP_addr takes a single operand of address size width:
uint8_t expr[] = {DW_OP_addr, 0x40, 0x0, 0x0, 0x0};
DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
/*addr_size*/ 4);
llvm::Expected<Value> result = DWARFExpression::Evaluate(
&exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor,
/*unit*/ nullptr, lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
/*object_address_ptr*/ nullptr);
ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
}
TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr_index) {
const char *yamldata = R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_386
DWARF:
debug_abbrev:
- Table:
- Code: 0x00000001
Tag: DW_TAG_compile_unit
Children: DW_CHILDREN_no
Attributes:
- Attribute: DW_AT_addr_base
Form: DW_FORM_sec_offset
debug_info:
- Version: 5
AddrSize: 4
UnitType: DW_UT_compile
Entries:
- AbbrCode: 0x00000001
Values:
- Value: 0x8 # Offset of the first Address past the header
- AbbrCode: 0x0
debug_addr:
- Version: 5
AddressSize: 4
Entries:
- Address: 0x1234
- Address: 0x5678
)";
// Can't use DWARFExpressionTester from above because subsystems overlap with
// the fixture.
SubsystemRAII<ObjectFileELF, SymbolFileDWARF> subsystems;
llvm::Expected<TestFile> file = TestFile::fromYaml(yamldata);
EXPECT_THAT_EXPECTED(file, llvm::Succeeded());
auto module_sp = std::make_shared<Module>(file->moduleSpec());
auto *dwarf_cu = llvm::cast<SymbolFileDWARF>(module_sp->GetSymbolFile())
->DebugInfo()
.GetUnitAtIndex(0);
ASSERT_TRUE(dwarf_cu);
dwarf_cu->ExtractDIEsIfNeeded();
// Set up a wasm target
ArchSpec arch("wasm32-unknown-unknown-wasm");
lldb::PlatformSP host_platform_sp =
platform_linux::PlatformLinux::CreateInstance(true, &arch);
ASSERT_TRUE(host_platform_sp);
Platform::SetHostPlatform(host_platform_sp);
lldb::DebuggerSP debugger_sp = Debugger::CreateInstance();
ASSERT_TRUE(debugger_sp);
lldb::TargetSP target_sp;
lldb::PlatformSP platform_sp;
debugger_sp->GetTargetList().CreateTarget(*debugger_sp, "", arch,
lldb_private::eLoadDependentsNo,
platform_sp, target_sp);
ExecutionContext exe_ctx(target_sp, false);
auto evaluate = [&](DWARFExpression &expr) -> llvm::Expected<Value> {
DataExtractor extractor;
expr.GetExpressionData(extractor);
return DWARFExpression::Evaluate(&exe_ctx, /*reg_ctx*/ nullptr,
/*module_sp*/ {}, extractor, dwarf_cu,
lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
/*object_address_ptr*/ nullptr);
};
// DW_OP_addrx takes a single leb128 operand, the index in the addr table:
uint8_t expr_data[] = {DW_OP_addrx, 0x01};
DataExtractor extractor(expr_data, sizeof(expr_data), lldb::eByteOrderLittle,
/*addr_size*/ 4);
DWARFExpression expr(extractor);
llvm::Expected<Value> result = evaluate(expr);
ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
ASSERT_EQ(result->GetScalar().UInt(), 0x5678u);
ASSERT_TRUE(expr.Update_DW_OP_addr(dwarf_cu, 0xdeadbeef));
result = evaluate(expr);
ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
ASSERT_EQ(result->GetScalar().UInt(), 0xdeadbeefu);
}
class CustomSymbolFileDWARF : public SymbolFileDWARF {
static char ID;
public:
using SymbolFileDWARF::SymbolFileDWARF;
bool isA(const void *ClassID) const override {
return ClassID == &ID || SymbolFile::isA(ClassID);
}
static bool classof(const SymbolFile *obj) { return obj->isA(&ID); }
static llvm::StringRef GetPluginNameStatic() { return "custom_dwarf"; }
static llvm::StringRef GetPluginDescriptionStatic() {
return "Symbol file reader with expression extensions.";
}
static void Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
SymbolFileDWARF::DebuggerInitialize);
}
static void Terminate() { PluginManager::UnregisterPlugin(CreateInstance); }
static lldb_private::SymbolFile *
CreateInstance(lldb::ObjectFileSP objfile_sp) {
return new CustomSymbolFileDWARF(std::move(objfile_sp),
/*dwo_section_list*/ nullptr);
}
lldb::offset_t
GetVendorDWARFOpcodeSize(const lldb_private::DataExtractor &data,
const lldb::offset_t data_offset,
const uint8_t op) const final {
auto offset = data_offset;
if (op != DW_OP_WASM_location) {
return LLDB_INVALID_OFFSET;
}
// DW_OP_WASM_location WASM_GLOBAL:0x03 index:u32
// Called with "arguments" 0x03 and 0x04
// Location type:
if (data.GetU8(&offset) != /* global */ 0x03) {
return LLDB_INVALID_OFFSET;
}
// Index
if (data.GetU32(&offset) != 0x04) {
return LLDB_INVALID_OFFSET;
}
// Report the skipped distance:
return offset - data_offset;
}
bool
ParseVendorDWARFOpcode(uint8_t op, const lldb_private::DataExtractor &opcodes,
lldb::offset_t &offset,
std::vector<lldb_private::Value> &stack) const final {
if (op != DW_OP_WASM_location) {
return false;
}
// DW_OP_WASM_location WASM_GLOBAL:0x03 index:u32
// Called with "arguments" 0x03 and 0x04
// Location type:
if (opcodes.GetU8(&offset) != /* global */ 0x03) {
return false;
}
// Index:
if (opcodes.GetU32(&offset) != 0x04) {
return false;
}
// Return some value:
stack.push_back({GetScalar(32, 42, false)});
return true;
}
};
char CustomSymbolFileDWARF::ID;
static auto testExpressionVendorExtensions(lldb::ModuleSP module_sp,
DWARFUnit &dwarf_unit) {
// Test that expression extensions can be evaluated, for example
// DW_OP_WASM_location which is not currently handled by DWARFExpression:
EXPECT_THAT_EXPECTED(Evaluate({DW_OP_WASM_location, 0x03, // WASM_GLOBAL:0x03
0x04, 0x00, 0x00, // index:u32
0x00, DW_OP_stack_value},
module_sp, &dwarf_unit),
llvm::HasValue(GetScalar(32, 42, false)));
// Test that searches for opcodes work in the presence of extensions:
uint8_t expr[] = {DW_OP_WASM_location, 0x03, 0x04, 0x00, 0x00, 0x00,
DW_OP_form_tls_address};
DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
/*addr_size*/ 4);
DWARFExpression dwarf_expr(extractor);
ASSERT_TRUE(dwarf_expr.ContainsThreadLocalStorage(&dwarf_unit));
}
TEST(DWARFExpression, Extensions) {
const char *yamldata = R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_386
DWARF:
debug_abbrev:
- Table:
- Code: 0x00000001
Tag: DW_TAG_compile_unit
Children: DW_CHILDREN_no
debug_info:
- Version: 4
AddrSize: 4
Entries:
- AbbrCode: 0x1
- AbbrCode: 0x0
)";
SubsystemRAII<FileSystem, HostInfo, TypeSystemClang, ObjectFileELF,
CustomSymbolFileDWARF>
subsystems;
llvm::Expected<TestFile> file = TestFile::fromYaml(yamldata);
EXPECT_THAT_EXPECTED(file, llvm::Succeeded());
auto module_sp = std::make_shared<Module>(file->moduleSpec());
auto &symfile =
*llvm::cast<CustomSymbolFileDWARF>(module_sp->GetSymbolFile());
auto *dwarf_unit = symfile.DebugInfo().GetUnitAtIndex(0);
testExpressionVendorExtensions(module_sp, *dwarf_unit);
}
TEST(DWARFExpression, ExtensionsDWO) {
const char *skeleton_yamldata = R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_386
DWARF:
debug_abbrev:
- Table:
- Code: 0x00000001
Tag: DW_TAG_skeleton_unit
Children: DW_CHILDREN_no
Attributes:
- Attribute: DW_AT_dwo_name
Form: DW_FORM_string
- Attribute: DW_AT_dwo_id
Form: DW_FORM_data4
debug_info:
- Version: 4
AddrSize: 4
Entries:
- AbbrCode: 0x1
Values:
- CStr: "dwo_unit"
- Value: 0x01020304
- AbbrCode: 0x0
)";
// .dwo sections aren't currently supported by dwarfyaml. The dwo_yamldata
// contents where generated by roundtripping the following yaml through
// yaml2obj | obj2yaml and renaming the sections. This works because the
// structure of the .dwo and non-.dwo sections is identical.
//
// --- !ELF
// FileHeader:
// Class: ELFCLASS64
// Data: ELFDATA2LSB
// Type: ET_EXEC
// Machine: EM_386
// DWARF:
// debug_abbrev: #.dwo
// - Table:
// - Code: 0x00000001
// Tag: DW_TAG_compile_unit
// Children: DW_CHILDREN_no
// Attributes:
// - Attribute: DW_AT_dwo_id
// Form: DW_FORM_data4
// debug_info: #.dwo
// - Version: 4
// AddrSize: 4
// Entries:
// - AbbrCode: 0x1
// Values:
// - Value: 0x0120304
// - AbbrCode: 0x0
const char *dwo_yamldata = R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_386
Sections:
- Name: .debug_abbrev.dwo
Type: SHT_PROGBITS
AddressAlign: 0x1
Content: '0111007506000000'
- Name: .debug_info.dwo
Type: SHT_PROGBITS
AddressAlign: 0x1
Content: 0D00000004000000000004010403020100
)";
SubsystemRAII<FileSystem, HostInfo, ObjectFileELF, CustomSymbolFileDWARF>
subsystems;
llvm::Expected<TestFile> skeleton_file =
TestFile::fromYaml(skeleton_yamldata);
EXPECT_THAT_EXPECTED(skeleton_file, llvm::Succeeded());
llvm::Expected<TestFile> dwo_file = TestFile::fromYaml(dwo_yamldata);
EXPECT_THAT_EXPECTED(dwo_file, llvm::Succeeded());
auto skeleton_module_sp =
std::make_shared<Module>(skeleton_file->moduleSpec());
auto &skeleton_symfile =
*llvm::cast<CustomSymbolFileDWARF>(skeleton_module_sp->GetSymbolFile());
auto dwo_module_sp = std::make_shared<Module>(dwo_file->moduleSpec());
SymbolFileDWARFDwo dwo_symfile(
skeleton_symfile, dwo_module_sp->GetObjectFile()->shared_from_this(),
0x0120304);
auto *dwo_dwarf_unit = dwo_symfile.DebugInfo().GetUnitAtIndex(0);
testExpressionVendorExtensions(dwo_module_sp, *dwo_dwarf_unit);
}
TEST_F(DWARFExpressionMockProcessTest, DW_OP_piece_file_addr) {
using ::testing::ByMove;
using ::testing::ElementsAre;
using ::testing::Return;
// Set up a mock process.
ArchSpec arch("i386-pc-linux");
Platform::SetHostPlatform(
platform_linux::PlatformLinux::CreateInstance(true, &arch));
lldb::DebuggerSP debugger_sp = Debugger::CreateInstance();
ASSERT_TRUE(debugger_sp);
lldb::PlatformSP platform_sp;
auto target_sp =
std::make_shared<MockTarget>(*debugger_sp, arch, platform_sp);
ASSERT_TRUE(target_sp);
ASSERT_TRUE(target_sp->GetArchitecture().IsValid());
EXPECT_CALL(*target_sp, ReadMemory(0x40, 1))
.WillOnce(Return(ByMove(std::vector<uint8_t>{0x11})));
EXPECT_CALL(*target_sp, ReadMemory(0x50, 1))
.WillOnce(Return(ByMove(std::vector<uint8_t>{0x22})));
ExecutionContext exe_ctx(static_cast<lldb::TargetSP>(target_sp), false);
uint8_t expr[] = {DW_OP_addr, 0x40, 0x0, 0x0, 0x0, DW_OP_piece, 1,
DW_OP_addr, 0x50, 0x0, 0x0, 0x0, DW_OP_piece, 1};
DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
/*addr_size*/ 4);
llvm::Expected<Value> result = DWARFExpression::Evaluate(
&exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor,
/*unit*/ nullptr, lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
/*object_address_ptr*/ nullptr);
ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
ASSERT_EQ(result->GetValueType(), Value::ValueType::HostAddress);
ASSERT_THAT(result->GetBuffer().GetData(), ElementsAre(0x11, 0x22));
}
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