forked from OSchip/llvm-project
[LLDB] Fixing DWARFExpression handling of ValueType::FileAddress case for DW_OP_deref_size
Currently DW_OP_deref_size just drops the ValueType::FileAddress case and does not attempt to handle it. This adds support for this case and a test that verifies this support. I did a little refactoring since DW_OP_deref and DW_OP_deref_size have some overlap in code. Also see: rdar://66870821 Differential Revision: https://reviews.llvm.org/D121408
This commit is contained in:
Shafik Yaghmour
parent
be6e84e252
commit
6583f01707
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@ -943,6 +943,80 @@ void UpdateValueTypeFromLocationDescription(Log *log, const DWARFUnit *dwarf_cu,
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}
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} // namespace
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/// Helper function to move common code used to resolve a file address and turn
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/// into a load address.
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///
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/// \param exe_ctx Pointer to the execution context
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/// \param module_sp shared_ptr contains the module if we have one
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/// \param error_ptr pointer to Status object if we have one
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/// \param dw_op_type C-style string used to vary the error output
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/// \param file_addr the file address we are trying to resolve and turn into a
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/// load address
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/// \param so_addr out parameter, will be set to load addresss or section offset
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/// \param check_sectionoffset bool which determines if having a section offset
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/// but not a load address is considerd a success
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/// \returns llvm::Optional containing the load address if resolving and getting
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/// the load address succeed or an empty Optinal otherwise. If
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/// check_sectionoffset is true we consider LLDB_INVALID_ADDRESS a
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/// success if so_addr.IsSectionOffset() is true.
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static llvm::Optional<lldb::addr_t>
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ResolveAndLoadFileAddress(ExecutionContext *exe_ctx, lldb::ModuleSP module_sp,
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Status *error_ptr, const char *dw_op_type,
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lldb::addr_t file_addr, Address &so_addr,
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bool check_sectionoffset = false) {
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if (!module_sp) {
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if (error_ptr)
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error_ptr->SetErrorStringWithFormat(
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"need module to resolve file address for %s", dw_op_type);
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return {};
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}
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if (!module_sp->ResolveFileAddress(file_addr, so_addr)) {
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if (error_ptr)
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error_ptr->SetErrorString("failed to resolve file address in module");
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return {};
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}
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addr_t load_addr = so_addr.GetLoadAddress(exe_ctx->GetTargetPtr());
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if (load_addr == LLDB_INVALID_ADDRESS &&
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(check_sectionoffset && !so_addr.IsSectionOffset())) {
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if (error_ptr)
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error_ptr->SetErrorString("failed to resolve load address");
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return {};
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}
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return load_addr;
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}
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/// Helper function to move common code used to load sized data from a uint8_t
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/// buffer.
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///
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/// \param addr_bytes uint8_t buffer containg raw data
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/// \param size_addr_bytes how large is the underlying raw data
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/// \param byte_order what is the byter order of the underlyig data
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/// \param size How much of the underlying data we want to use
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/// \return The underlying data converted into a Scalar
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static Scalar DerefSizeExtractDataHelper(uint8_t *addr_bytes,
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size_t size_addr_bytes,
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ByteOrder byte_order, size_t size) {
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DataExtractor addr_data(addr_bytes, size_addr_bytes, byte_order, size);
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lldb::offset_t addr_data_offset = 0;
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switch (size) {
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case 1:
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return addr_data.GetU8(&addr_data_offset);
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case 2:
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return addr_data.GetU16(&addr_data_offset);
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case 4:
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return addr_data.GetU32(&addr_data_offset);
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case 8:
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return addr_data.GetU64(&addr_data_offset);
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default:
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return addr_data.GetAddress(&addr_data_offset);
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}
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}
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bool DWARFExpression::Evaluate(
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ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
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lldb::ModuleSP module_sp, const DataExtractor &opcodes,
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@ -1025,6 +1099,7 @@ bool DWARFExpression::Evaluate(
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if (frame)
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stack.back().ConvertToLoadAddress(module_sp.get(),
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frame->CalculateTarget().get());
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break;
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// The DW_OP_addr_sect_offset4 is used for any location expressions in
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@ -1088,26 +1163,15 @@ bool DWARFExpression::Evaluate(
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case Value::ValueType::FileAddress: {
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auto file_addr = stack.back().GetScalar().ULongLong(
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LLDB_INVALID_ADDRESS);
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if (!module_sp) {
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if (error_ptr)
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error_ptr->SetErrorString(
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"need module to resolve file address for DW_OP_deref");
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return false;
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}
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Address so_addr;
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if (!module_sp->ResolveFileAddress(file_addr, so_addr)) {
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if (error_ptr)
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error_ptr->SetErrorString(
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"failed to resolve file address in module");
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auto maybe_load_addr = ResolveAndLoadFileAddress(
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exe_ctx, module_sp, error_ptr, "DW_OP_deref", file_addr, so_addr);
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if (!maybe_load_addr)
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return false;
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}
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addr_t load_Addr = so_addr.GetLoadAddress(exe_ctx->GetTargetPtr());
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if (load_Addr == LLDB_INVALID_ADDRESS) {
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if (error_ptr)
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error_ptr->SetErrorString("failed to resolve load address");
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return false;
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}
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stack.back().GetScalar() = load_Addr;
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stack.back().GetScalar() = *maybe_load_addr;
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// Fall through to load address promotion code below.
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} LLVM_FALLTHROUGH;
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case Value::ValueType::Scalar:
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@ -1218,6 +1282,47 @@ bool DWARFExpression::Evaluate(
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stack.back().GetScalar() = ptr;
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stack.back().ClearContext();
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} break;
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case Value::ValueType::FileAddress: {
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auto file_addr =
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stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
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Address so_addr;
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auto maybe_load_addr =
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ResolveAndLoadFileAddress(exe_ctx, module_sp, error_ptr,
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"DW_OP_deref_size", file_addr, so_addr,
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/*check_sectionoffset=*/true);
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if (!maybe_load_addr)
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return false;
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addr_t load_addr = *maybe_load_addr;
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if (load_addr == LLDB_INVALID_ADDRESS && so_addr.IsSectionOffset()) {
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uint8_t addr_bytes[size];
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Status error;
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if (exe_ctx->GetTargetRef().ReadMemory(
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so_addr, &addr_bytes, size, error,
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/*force_live_memory=*/false) == size) {
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ObjectFile *objfile = module_sp->GetObjectFile();
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stack.back().GetScalar() = DerefSizeExtractDataHelper(
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addr_bytes, sizeof(addr_bytes), objfile->GetByteOrder(), size);
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stack.back().ClearContext();
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break;
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} else {
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if (error_ptr)
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error_ptr->SetErrorStringWithFormat(
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"Failed to dereference pointer for for DW_OP_deref_size: "
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"%s\n",
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error.AsCString());
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return false;
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}
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}
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stack.back().GetScalar() = load_addr;
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// Fall through to load address promotion code below.
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}
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LLVM_FALLTHROUGH;
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case Value::ValueType::Scalar:
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case Value::ValueType::LoadAddress:
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if (exe_ctx) {
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@ -1228,26 +1333,10 @@ bool DWARFExpression::Evaluate(
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Status error;
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if (process->ReadMemory(pointer_addr, &addr_bytes, size, error) ==
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size) {
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DataExtractor addr_data(addr_bytes, sizeof(addr_bytes),
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process->GetByteOrder(), size);
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lldb::offset_t addr_data_offset = 0;
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switch (size) {
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case 1:
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stack.back().GetScalar() = addr_data.GetU8(&addr_data_offset);
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break;
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case 2:
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stack.back().GetScalar() = addr_data.GetU16(&addr_data_offset);
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break;
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case 4:
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stack.back().GetScalar() = addr_data.GetU32(&addr_data_offset);
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break;
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case 8:
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stack.back().GetScalar() = addr_data.GetU64(&addr_data_offset);
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break;
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default:
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stack.back().GetScalar() =
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addr_data.GetAddress(&addr_data_offset);
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}
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stack.back().GetScalar() =
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DerefSizeExtractDataHelper(addr_bytes, sizeof(addr_bytes),
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process->GetByteOrder(), size);
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stack.back().ClearContext();
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} else {
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if (error_ptr)
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@ -1270,7 +1359,6 @@ bool DWARFExpression::Evaluate(
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}
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break;
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case Value::ValueType::FileAddress:
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case Value::ValueType::Invalid:
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if (error_ptr)
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error_ptr->SetErrorString("Invalid value for DW_OP_deref_size.\n");
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@ -0,0 +1,316 @@
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# RUN: llvm-mc -filetype=obj -o %t -triple x86_64-apple-macosx10.15.0 %s
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# RUN: %lldb %t -o "target variable ug" -b | FileCheck %s
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# CHECK: (lldb) target variable ug
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# CHECK: (U) ug = {
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# CHECK: raw = 0
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# CHECK: = (a = 0, b = 0, c = 0, d = 0, e = 0, f = 0)
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# CHECK: }
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# We are testing how DWARFExpression::Evaluate(...) in the case of
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# DW_OP_deref_size deals with static variable.
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#
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# The address will be a ValueType::FileAddress type which we will not be able
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# to turn into a load address but it is a section offset. We should be able to
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# use Target::ReadMemory(...) to read the data in this case.
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# Compiling at -O1 allows us to capture this case and test it.
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#
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# typedef union {
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# unsigned raw;
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# struct {
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# unsigned a : 8;
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# unsigned b : 8;
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# unsigned c : 6;
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# unsigned d : 2;
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# unsigned e : 6;
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# unsigned f : 2;
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# };
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# } U;
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#
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# // This appears first in the debug info and pulls the type definition in...
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# static U __attribute__((used)) _type_anchor;
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# // ... then our useful variable appears last in the debug info and we can
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# // tweak the assembly without needing to edit a lot of offsets by hand.
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# static U ug;
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#
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# extern void f(U);
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#
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# // Omit debug info for main.
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# __attribute__((nodebug))
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# int main() {
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# ug.raw = 0x64A40101;
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# f(ug);
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# f((U)ug.raw);
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# }
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#
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# Compiled as follows:
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#
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# clang -O1 -gdwarf-4 dw_op_deref_size_test.c -S -o dw_op_deref_size_test.s
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#
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# Hand modified .s file to remoce various section that are not needed for this
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# test
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.zerofill __DATA,__bss,_ug.0,1,2 ## @ug.0
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.zerofill __DATA,__bss,__type_anchor,4,2 ## @_type_anchor
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.no_dead_strip __type_anchor
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.section __DWARF,__debug_abbrev,regular,debug
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Lsection_abbrev:
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.byte 1 ## Abbreviation Code
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.byte 17 ## DW_TAG_compile_unit
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.byte 1 ## DW_CHILDREN_yes
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.byte 37 ## DW_AT_producer
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.byte 14 ## DW_FORM_strp
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.byte 19 ## DW_AT_language
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.byte 5 ## DW_FORM_data2
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.ascii "\202|" ## DW_AT_LLVM_sysroot
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.byte 14 ## DW_FORM_strp
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.ascii "\357\177" ## DW_AT_APPLE_sdk
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.byte 14 ## DW_FORM_strp
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.byte 16 ## DW_AT_stmt_list
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.byte 23 ## DW_FORM_sec_offset
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.byte 27 ## DW_AT_comp_dir
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.byte 14 ## DW_FORM_strp
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.ascii "\341\177" ## DW_AT_APPLE_optimized
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.byte 25 ## DW_FORM_flag_present
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 2 ## Abbreviation Code
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.byte 52 ## DW_TAG_variable
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 2 ## DW_AT_location
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.byte 24 ## DW_FORM_exprloc
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 3 ## Abbreviation Code
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.byte 22 ## DW_TAG_typedef
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.byte 0 ## DW_CHILDREN_no
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 4 ## Abbreviation Code
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.byte 23 ## DW_TAG_union_type
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.byte 1 ## DW_CHILDREN_yes
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.byte 11 ## DW_AT_byte_size
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.byte 11 ## DW_FORM_data1
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 5 ## Abbreviation Code
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.byte 13 ## DW_TAG_member
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 56 ## DW_AT_data_member_location
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 6 ## Abbreviation Code
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.byte 13 ## DW_TAG_member
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.byte 0 ## DW_CHILDREN_no
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 56 ## DW_AT_data_member_location
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 7 ## Abbreviation Code
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.byte 19 ## DW_TAG_structure_type
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.byte 1 ## DW_CHILDREN_yes
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.byte 11 ## DW_AT_byte_size
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.byte 11 ## DW_FORM_data1
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 8 ## Abbreviation Code
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.byte 13 ## DW_TAG_member
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 13 ## DW_AT_bit_size
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.byte 11 ## DW_FORM_data1
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.byte 107 ## DW_AT_data_bit_offset
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 9 ## Abbreviation Code
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.byte 36 ## DW_TAG_base_type
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 62 ## DW_AT_encoding
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.byte 11 ## DW_FORM_data1
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.byte 11 ## DW_AT_byte_size
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 0 ## EOM(3)
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.section __DWARF,__debug_info,regular,debug
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Lsection_info:
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Lcu_begin0:
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.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
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.long Lset0
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Ldebug_info_start0:
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.short 4 ## DWARF version number
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.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
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.long Lset1
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.byte 8 ## Address Size (in bytes)
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.byte 1 ## Abbrev [1] 0xb:0xd0 DW_TAG_compile_unit
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.long 0 ## DW_AT_producer
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.short 12 ## DW_AT_language
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.long 105 ## DW_AT_name
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.long 129 ## DW_AT_LLVM_sysroot
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.long 185 ## DW_AT_APPLE_sdk
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.long 0
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.long 200 ## DW_AT_comp_dir
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## DW_AT_APPLE_optimized
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.byte 2 ## Abbrev [2] 0x26:0x15 DW_TAG_variable
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.long 219 ## DW_AT_name
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.long 59 ## DW_AT_type
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.byte 1 ## DW_AT_decl_file
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.byte 14 ## DW_AT_decl_line
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.byte 9 ## DW_AT_location
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.byte 3
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.quad __type_anchor
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.byte 3 ## Abbrev [3] 0x3b:0xb DW_TAG_typedef
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.long 70 ## DW_AT_type
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.long 232 ## DW_AT_name
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.byte 1 ## DW_AT_decl_file
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.byte 11 ## DW_AT_decl_line
|
||||
.byte 4 ## Abbrev [4] 0x46:0x6c DW_TAG_union_type
|
||||
.byte 4 ## DW_AT_byte_size
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 1 ## DW_AT_decl_line
|
||||
.byte 5 ## Abbrev [5] 0x4a:0xc DW_TAG_member
|
||||
.long 234 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 2 ## DW_AT_decl_line
|
||||
.byte 0 ## DW_AT_data_member_location
|
||||
.byte 6 ## Abbrev [6] 0x56:0x8 DW_TAG_member
|
||||
.long 94 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 3 ## DW_AT_decl_line
|
||||
.byte 0 ## DW_AT_data_member_location
|
||||
.byte 7 ## Abbrev [7] 0x5e:0x53 DW_TAG_structure_type
|
||||
.byte 4 ## DW_AT_byte_size
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 3 ## DW_AT_decl_line
|
||||
.byte 8 ## Abbrev [8] 0x62:0xd DW_TAG_member
|
||||
.long 251 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 4 ## DW_AT_decl_line
|
||||
.byte 8 ## DW_AT_bit_size
|
||||
.byte 0 ## DW_AT_data_bit_offset
|
||||
.byte 8 ## Abbrev [8] 0x6f:0xd DW_TAG_member
|
||||
.long 253 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 5 ## DW_AT_decl_line
|
||||
.byte 8 ## DW_AT_bit_size
|
||||
.byte 8 ## DW_AT_data_bit_offset
|
||||
.byte 8 ## Abbrev [8] 0x7c:0xd DW_TAG_member
|
||||
.long 255 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 6 ## DW_AT_decl_line
|
||||
.byte 6 ## DW_AT_bit_size
|
||||
.byte 16 ## DW_AT_data_bit_offset
|
||||
.byte 8 ## Abbrev [8] 0x89:0xd DW_TAG_member
|
||||
.long 257 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 7 ## DW_AT_decl_line
|
||||
.byte 2 ## DW_AT_bit_size
|
||||
.byte 22 ## DW_AT_data_bit_offset
|
||||
.byte 8 ## Abbrev [8] 0x96:0xd DW_TAG_member
|
||||
.long 259 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 8 ## DW_AT_decl_line
|
||||
.byte 6 ## DW_AT_bit_size
|
||||
.byte 24 ## DW_AT_data_bit_offset
|
||||
.byte 8 ## Abbrev [8] 0xa3:0xd DW_TAG_member
|
||||
.long 261 ## DW_AT_name
|
||||
.long 178 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 9 ## DW_AT_decl_line
|
||||
.byte 2 ## DW_AT_bit_size
|
||||
.byte 30 ## DW_AT_data_bit_offset
|
||||
.byte 0 ## End Of Children Mark
|
||||
.byte 0 ## End Of Children Mark
|
||||
.byte 9 ## Abbrev [9] 0xb2:0x7 DW_TAG_base_type
|
||||
.long 238 ## DW_AT_name
|
||||
.byte 7 ## DW_AT_encoding
|
||||
.byte 4 ## DW_AT_byte_size
|
||||
.byte 2 ## Abbrev [2] 0xb9:0x21 DW_TAG_variable
|
||||
.long 263 ## DW_AT_name
|
||||
.long 59 ## DW_AT_type
|
||||
.byte 1 ## DW_AT_decl_file
|
||||
.byte 17 ## DW_AT_decl_line
|
||||
.byte 21 ## DW_AT_location
|
||||
.byte 3
|
||||
.quad _ug.0
|
||||
.byte 148
|
||||
.byte 1
|
||||
.byte 16
|
||||
.ascii "\201\202\220\245\006"
|
||||
.byte 30
|
||||
.byte 48
|
||||
.byte 34
|
||||
.byte 159
|
||||
.byte 0 ## End Of Children Mark
|
||||
Ldebug_info_end0:
|
||||
.section __DWARF,__debug_str,regular,debug
|
||||
Linfo_string:
|
||||
.zero 219
|
||||
.asciz "_type_anchor" ## string offset=219
|
||||
.asciz "U" ## string offset=232
|
||||
.asciz "raw" ## string offset=234
|
||||
.asciz "unsigned int" ## string offset=238
|
||||
.asciz "a" ## string offset=251
|
||||
.asciz "b" ## string offset=253
|
||||
.asciz "c" ## string offset=255
|
||||
.asciz "d" ## string offset=257
|
||||
.asciz "e" ## string offset=259
|
||||
.asciz "f" ## string offset=261
|
||||
.asciz "ug" ## string offset=263
|
||||
Loading…
Reference in New Issue