[llvm] r308245 - [DWARF] Modification of code for the verification of .debug_info section.
Spyridoula Gravani via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 17 18:00:27 PDT 2017
Author: sgravani
Date: Mon Jul 17 18:00:26 2017
New Revision: 308245
URL: http://llvm.org/viewvc/llvm-project?rev=308245&view=rev
Log:
[DWARF] Modification of code for the verification of .debug_info section.
Summary:
This patch modifies the handleDebugInfo() function so that we verify the contents of each unit
in the .debug_info section only if its header has been successfully verified.
This change will allow for more/different verification checks depending on the type of the unit since from
dwarf5, the .debug_info section may consist of different types of units.
Subscribers: aprantl
Differential Revision: https://reviews.llvm.org/D35521
Added:
llvm/trunk/test/tools/llvm-dwarfdump/X86/verify_debug_info.s
Modified:
llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp
Modified: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h?rev=308245&r1=308244&r2=308245&view=diff
==============================================================================
--- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h (original)
+++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h Mon Jul 17 18:00:26 2017
@@ -31,7 +31,6 @@ class DWARFVerifier {
/// can verify each reference points to a valid DIE and not an offset that
/// lies between to valid DIEs.
std::map<uint64_t, std::set<uint32_t>> ReferenceToDIEOffsets;
- uint32_t NumDebugInfoErrors = 0;
uint32_t NumDebugLineErrors = 0;
uint32_t NumAppleNamesErrors = 0;
@@ -50,14 +49,17 @@ class DWARFVerifier {
/// \param Offset A reference to the offset start of the unit. The offset will
/// be updated to point to the next unit in .debug_info
/// \param UnitIndex The index of the unit to be verified
+ /// \param UnitType A reference to the type of the unit
/// \param isUnitDWARF64 A reference to a flag that shows whether the unit is
/// in 64-bit format.
///
/// \returns true if the header is verified successfully, false otherwise.
bool verifyUnitHeader(const DWARFDataExtractor DebugInfoData,
- uint32_t *Offset, unsigned UnitIndex,
+ uint32_t *Offset, unsigned UnitIndex, uint8_t &UnitType,
bool &isUnitDWARF64);
+
+ bool verifyUnitContents(DWARFUnit Unit);
/// Verifies the attribute's DWARF attribute and its value.
///
/// This function currently checks for:
@@ -66,7 +68,11 @@ class DWARFVerifier {
///
/// \param Die The DWARF DIE that owns the attribute value
/// \param AttrValue The DWARF attribute value to check
- void verifyDebugInfoAttribute(const DWARFDie &Die, DWARFAttribute &AttrValue);
+ ///
+ /// \returns NumErrors The number of errors occured during verification of
+ /// attributes' values in a .debug_info section unit
+ unsigned verifyDebugInfoAttribute(const DWARFDie &Die,
+ DWARFAttribute &AttrValue);
/// Verifies the attribute's DWARF form.
///
@@ -77,7 +83,10 @@ class DWARFVerifier {
///
/// \param Die The DWARF DIE that owns the attribute value
/// \param AttrValue The DWARF attribute value to check
- void verifyDebugInfoForm(const DWARFDie &Die, DWARFAttribute &AttrValue);
+ ///
+ /// \returns NumErrors The number of errors occured during verification of
+ /// attributes' forms in a .debug_info section unit
+ unsigned verifyDebugInfoForm(const DWARFDie &Die, DWARFAttribute &AttrValue);
/// Verifies the all valid references that were found when iterating through
/// all of the DIE attributes.
@@ -86,7 +95,10 @@ class DWARFVerifier {
/// offset matches. This helps to ensure if a DWARF link phase moved things
/// around, that it doesn't create invalid references by failing to relocate
/// CU relative and absolute references.
- void verifyDebugInfoReferences();
+ ///
+ /// \returns NumErrors The number of errors occured during verification of
+ /// references for the .debug_info section
+ unsigned verifyDebugInfoReferences();
/// Verify the the DW_AT_stmt_list encoding and value and ensure that no
/// compile units that have the same DW_AT_stmt_list value.
@@ -102,14 +114,6 @@ class DWARFVerifier {
public:
DWARFVerifier(raw_ostream &S, DWARFContext &D)
: OS(S), DCtx(D) {}
- /// Verify the unit header chain in the .debug_info section.
- ///
- /// Any errors are reported to the stream that this object was
- /// constructed with.
- ///
- /// \returns true if the unit header chain verifies successfully, false
- /// otherwise.
- bool handleDebugInfoUnitHeaderChain();
/// Verify the information in the .debug_info section.
///
/// Any errors are reported to the stream that was this object was
Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp?rev=308245&r1=308244&r2=308245&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp (original)
+++ llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp Mon Jul 17 18:00:26 2017
@@ -414,8 +414,6 @@ DWARFDie DWARFContext::getDIEForOffset(u
bool DWARFContext::verify(raw_ostream &OS, DIDumpType DumpType) {
bool Success = true;
DWARFVerifier verifier(OS, *this);
- if (!verifier.handleDebugInfoUnitHeaderChain())
- Success = false;
if (DumpType == DIDT_All || DumpType == DIDT_Info) {
if (!verifier.handleDebugInfo())
Success = false;
Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp?rev=308245&r1=308244&r2=308245&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp (original)
+++ llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp Mon Jul 17 18:00:26 2017
@@ -25,10 +25,10 @@ using namespace dwarf;
using namespace object;
bool DWARFVerifier::verifyUnitHeader(const DWARFDataExtractor DebugInfoData,
- uint32_t *Offset, unsigned UnitIndex,
- bool &isUnitDWARF64) {
+ uint32_t *Offset, unsigned UnitIndex,
+ uint8_t &UnitType, bool &isUnitDWARF64) {
uint32_t AbbrOffset, Length;
- uint8_t AddrSize = 0, UnitType = 0;
+ uint8_t AddrSize = 0;
uint16_t Version;
bool Success = true;
@@ -55,6 +55,7 @@ bool DWARFVerifier::verifyUnitHeader(con
AbbrOffset = DebugInfoData.getU32(Offset);
ValidType = DWARFUnit::isValidUnitType(UnitType);
} else {
+ UnitType = 0;
AbbrOffset = DebugInfoData.getU32(Offset);
AddrSize = DebugInfoData.getU8(Offset);
}
@@ -86,47 +87,103 @@ bool DWARFVerifier::verifyUnitHeader(con
return Success;
}
-bool DWARFVerifier::handleDebugInfoUnitHeaderChain() {
+bool DWARFVerifier::verifyUnitContents(DWARFUnit Unit) {
+ uint32_t NumUnitErrors = 0;
+ unsigned NumDies = Unit.getNumDIEs();
+ for (unsigned I = 0; I < NumDies; ++I) {
+ auto Die = Unit.getDIEAtIndex(I);
+ if (Die.getTag() == DW_TAG_null)
+ continue;
+ for (auto AttrValue : Die.attributes()) {
+ NumUnitErrors += verifyDebugInfoAttribute(Die, AttrValue);
+ NumUnitErrors += verifyDebugInfoForm(Die, AttrValue);
+ }
+ }
+ return NumUnitErrors == 0;
+}
+
+bool DWARFVerifier::handleDebugInfo() {
OS << "Verifying .debug_info Unit Header Chain...\n";
DWARFDataExtractor DebugInfoData(DCtx.getInfoSection(), DCtx.isLittleEndian(),
0);
- uint32_t Offset = 0, UnitIdx = 0;
+ uint32_t NumDebugInfoErrors = 0;
+ uint32_t OffsetStart = 0, Offset = 0, UnitIdx = 0;
+ uint8_t UnitType = 0;
bool isUnitDWARF64 = false;
- bool Success = true;
+ bool isHeaderChainValid = true;
bool hasDIE = DebugInfoData.isValidOffset(Offset);
while (hasDIE) {
- if (!verifyUnitHeader(DebugInfoData, &Offset, UnitIdx, isUnitDWARF64)) {
- Success = false;
+ OffsetStart = Offset;
+ if (!verifyUnitHeader(DebugInfoData, &Offset, UnitIdx, UnitType,
+ isUnitDWARF64)) {
+ isHeaderChainValid = false;
if (isUnitDWARF64)
break;
+ } else {
+ std::unique_ptr<DWARFUnit> Unit;
+ switch (UnitType) {
+ case dwarf::DW_UT_type:
+ case dwarf::DW_UT_split_type: {
+ DWARFUnitSection<DWARFTypeUnit> TUSection{};
+ Unit.reset(new DWARFTypeUnit(
+ DCtx, DCtx.getInfoSection(), DCtx.getDebugAbbrev(),
+ &DCtx.getRangeSection(), DCtx.getStringSection(),
+ DCtx.getStringOffsetSection(), &DCtx.getAppleObjCSection(),
+ DCtx.getLineSection(), DCtx.isLittleEndian(), false, TUSection,
+ nullptr));
+ break;
+ }
+ case dwarf::DW_UT_skeleton:
+ case dwarf::DW_UT_split_compile:
+ case dwarf::DW_UT_compile:
+ case dwarf::DW_UT_partial:
+ // UnitType = 0 means that we are
+ // verifying a compile unit in DWARF v4.
+ case 0: {
+ DWARFUnitSection<DWARFCompileUnit> CUSection{};
+ Unit.reset(new DWARFCompileUnit(
+ DCtx, DCtx.getInfoSection(), DCtx.getDebugAbbrev(),
+ &DCtx.getRangeSection(), DCtx.getStringSection(),
+ DCtx.getStringOffsetSection(), &DCtx.getAppleObjCSection(),
+ DCtx.getLineSection(), DCtx.isLittleEndian(), false, CUSection,
+ nullptr));
+ break;
+ }
+ default: { llvm_unreachable("Invalid UnitType."); }
+ }
+ Unit->extract(DebugInfoData, &OffsetStart);
+ if (!verifyUnitContents(*Unit))
+ ++NumDebugInfoErrors;
}
hasDIE = DebugInfoData.isValidOffset(Offset);
++UnitIdx;
}
if (UnitIdx == 0 && !hasDIE) {
OS << "Warning: .debug_info is empty.\n";
- Success = true;
+ isHeaderChainValid = true;
}
- return Success;
+ NumDebugInfoErrors += verifyDebugInfoReferences();
+ return (isHeaderChainValid && NumDebugInfoErrors == 0);
}
-void DWARFVerifier::verifyDebugInfoAttribute(const DWARFDie &Die,
- DWARFAttribute &AttrValue) {
+unsigned DWARFVerifier::verifyDebugInfoAttribute(const DWARFDie &Die,
+ DWARFAttribute &AttrValue) {
+ unsigned NumErrors = 0;
const auto Attr = AttrValue.Attr;
switch (Attr) {
case DW_AT_ranges:
// Make sure the offset in the DW_AT_ranges attribute is valid.
if (auto SectionOffset = AttrValue.Value.getAsSectionOffset()) {
if (*SectionOffset >= DCtx.getRangeSection().Data.size()) {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DW_AT_ranges offset is beyond .debug_ranges "
"bounds:\n";
Die.dump(OS, 0);
OS << "\n";
}
} else {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DIE has invalid DW_AT_ranges encoding:\n";
Die.dump(OS, 0);
OS << "\n";
@@ -136,7 +193,7 @@ void DWARFVerifier::verifyDebugInfoAttri
// Make sure the offset in the DW_AT_stmt_list attribute is valid.
if (auto SectionOffset = AttrValue.Value.getAsSectionOffset()) {
if (*SectionOffset >= DCtx.getLineSection().Data.size()) {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DW_AT_stmt_list offset is beyond .debug_line "
"bounds: "
<< format("0x%08" PRIx32, *SectionOffset) << "\n";
@@ -144,7 +201,7 @@ void DWARFVerifier::verifyDebugInfoAttri
OS << "\n";
}
} else {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DIE has invalid DW_AT_stmt_list encoding:\n";
Die.dump(OS, 0);
OS << "\n";
@@ -154,10 +211,12 @@ void DWARFVerifier::verifyDebugInfoAttri
default:
break;
}
+ return NumErrors;
}
-void DWARFVerifier::verifyDebugInfoForm(const DWARFDie &Die,
- DWARFAttribute &AttrValue) {
+unsigned DWARFVerifier::verifyDebugInfoForm(const DWARFDie &Die,
+ DWARFAttribute &AttrValue) {
+ unsigned NumErrors = 0;
const auto Form = AttrValue.Value.getForm();
switch (Form) {
case DW_FORM_ref1:
@@ -173,7 +232,7 @@ void DWARFVerifier::verifyDebugInfoForm(
auto CUSize = DieCU->getNextUnitOffset() - DieCU->getOffset();
auto CUOffset = AttrValue.Value.getRawUValue();
if (CUOffset >= CUSize) {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: " << FormEncodingString(Form) << " CU offset "
<< format("0x%08" PRIx32, CUOffset)
<< " is invalid (must be less than CU size of "
@@ -195,7 +254,7 @@ void DWARFVerifier::verifyDebugInfoForm(
assert(RefVal);
if (RefVal) {
if (*RefVal >= DCtx.getInfoSection().Data.size()) {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DW_FORM_ref_addr offset beyond .debug_info "
"bounds:\n";
Die.dump(OS, 0);
@@ -212,7 +271,7 @@ void DWARFVerifier::verifyDebugInfoForm(
auto SecOffset = AttrValue.Value.getAsSectionOffset();
assert(SecOffset); // DW_FORM_strp is a section offset.
if (SecOffset && *SecOffset >= DCtx.getStringSection().size()) {
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: DW_FORM_strp offset beyond .debug_str bounds:\n";
Die.dump(OS, 0);
OS << "\n";
@@ -222,17 +281,19 @@ void DWARFVerifier::verifyDebugInfoForm(
default:
break;
}
+ return NumErrors;
}
-void DWARFVerifier::verifyDebugInfoReferences() {
+unsigned DWARFVerifier::verifyDebugInfoReferences() {
// Take all references and make sure they point to an actual DIE by
// getting the DIE by offset and emitting an error
OS << "Verifying .debug_info references...\n";
+ unsigned NumErrors = 0;
for (auto Pair : ReferenceToDIEOffsets) {
auto Die = DCtx.getDIEForOffset(Pair.first);
if (Die)
continue;
- ++NumDebugInfoErrors;
+ ++NumErrors;
OS << "error: invalid DIE reference " << format("0x%08" PRIx64, Pair.first)
<< ". Offset is in between DIEs:\n";
for (auto Offset : Pair.second) {
@@ -242,26 +303,7 @@ void DWARFVerifier::verifyDebugInfoRefer
}
OS << "\n";
}
-}
-
-bool DWARFVerifier::handleDebugInfo() {
- NumDebugInfoErrors = 0;
- OS << "Verifying .debug_info...\n";
- for (const auto &CU : DCtx.compile_units()) {
- unsigned NumDies = CU->getNumDIEs();
- for (unsigned I = 0; I < NumDies; ++I) {
- auto Die = CU->getDIEAtIndex(I);
- const auto Tag = Die.getTag();
- if (Tag == DW_TAG_null)
- continue;
- for (auto AttrValue : Die.attributes()) {
- verifyDebugInfoAttribute(Die, AttrValue);
- verifyDebugInfoForm(Die, AttrValue);
- }
- }
- }
- verifyDebugInfoReferences();
- return NumDebugInfoErrors == 0;
+ return NumErrors;
}
void DWARFVerifier::verifyDebugLineStmtOffsets() {
Added: llvm/trunk/test/tools/llvm-dwarfdump/X86/verify_debug_info.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-dwarfdump/X86/verify_debug_info.s?rev=308245&view=auto
==============================================================================
--- llvm/trunk/test/tools/llvm-dwarfdump/X86/verify_debug_info.s (added)
+++ llvm/trunk/test/tools/llvm-dwarfdump/X86/verify_debug_info.s Mon Jul 17 18:00:26 2017
@@ -0,0 +1,193 @@
+# RUN: llvm-mc %s -filetype obj -triple x86_64-apple-darwin -o - \
+# RUN: | not llvm-dwarfdump -verify - \
+# RUN: | FileCheck %s
+
+# CHECK: Verifying .debug_info Unit Header Chain...
+# CHECK-NEXT: error: DIE has invalid DW_AT_stmt_list encoding:{{[[:space:]]}}
+# CHECK-NEXT: 0x0000000c: DW_TAG_compile_unit [1] *
+# CHECK-NEXT: DW_AT_producer [DW_FORM_strp] ( .debug_str[0x00000000] = "clang version 5.0.0 (trunk 308185) (llvm/trunk 308186)")
+# CHECK-NEXT: DW_AT_language [DW_FORM_data2] (DW_LANG_C99)
+# CHECK-NEXT: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000037] = "basic.c")
+# CHECK-NEXT: DW_AT_stmt_list [DW_FORM_strx4] ( indexed (00000000) string = )
+# CHECK-NEXT: DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x0000003f] = "/Users/sgravani/Development/tests")
+# CHECK-NEXT: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
+# CHECK-NEXT: DW_AT_high_pc [DW_FORM_data4] (0x00000016){{[[:space:]]}}
+# CHECK-NEXT: Units[2] - start offset: 0x00000068
+# CHECK-NEXT: Error: The length for this unit is too large for the .debug_info provided.
+# CHECK-NEXT: Error: The unit type encoding is not valid.
+
+
+ .section __TEXT,__text,regular,pure_instructions
+ .globl _main ## -- Begin function main
+ .p2align 4, 0x90
+_main: ## @main
+Lfunc_begin0:
+ .file 1 "basic.c"
+ .loc 1 1 0 ## basic.c:1:0
+ .cfi_startproc
+## BB#0: ## %entry
+ pushq %rbp
+Lcfi0:
+ .cfi_def_cfa_offset 16
+Lcfi1:
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+Lcfi2:
+ .cfi_def_cfa_register %rbp
+ xorl %eax, %eax
+ movl $0, -4(%rbp)
+Ltmp0:
+ .loc 1 2 7 prologue_end ## basic.c:2:7
+ movl $1, -8(%rbp)
+ .loc 1 3 3 ## basic.c:3:3
+ popq %rbp
+ retq
+Ltmp1:
+Lfunc_end0:
+ .cfi_endproc
+ ## -- End function
+ .section __DWARF,__debug_str,regular,debug
+Linfo_string:
+ .asciz "clang version 5.0.0 (trunk 308185) (llvm/trunk 308186)" ## string offset=0
+ .asciz "basic.c" ## string offset=55
+ .asciz "/Users/sgravani/Development/tests" ## string offset=63
+ .asciz "main" ## string offset=97
+ .asciz "int" ## string offset=102
+ .asciz "a" ## string offset=106
+ .section __DWARF,__debug_abbrev,regular,debug
+Lsection_abbrev:
+ .byte 1 ## Abbreviation Code
+ .byte 17 ## DW_TAG_compile_unit
+ .byte 1 ## DW_CHILDREN_yes
+ .byte 37 ## DW_AT_producer
+ .byte 14 ## DW_FORM_strp
+ .byte 19 ## DW_AT_language
+ .byte 5 ## DW_FORM_data2
+ .byte 3 ## DW_AT_name
+ .byte 14 ## DW_FORM_strp
+ .byte 16 ## DW_AT_stmt_list
+ .byte 40 ## DW_FORM_sec_offset -- error: DIE has invalid DW_AT_stmt_list encoding:
+ .byte 27 ## DW_AT_comp_dir
+ .byte 14 ## DW_FORM_strp
+ .byte 17 ## DW_AT_low_pc
+ .byte 1 ## DW_FORM_addr
+ .byte 18 ## DW_AT_high_pc
+ .byte 6 ## DW_FORM_data4
+ .byte 0 ## EOM(1)
+ .byte 0 ## EOM(2)
+ .byte 2 ## Abbreviation Code
+ .byte 46 ## DW_TAG_subprogram
+ .byte 1 ## DW_CHILDREN_yes
+ .byte 17 ## DW_AT_low_pc
+ .byte 1 ## DW_FORM_addr
+ .byte 18 ## DW_AT_high_pc
+ .byte 6 ## DW_FORM_data4
+ .byte 64 ## DW_AT_frame_base
+ .byte 24 ## DW_FORM_exprloc
+ .byte 3 ## DW_AT_name
+ .byte 14 ## DW_FORM_strp
+ .byte 58 ## DW_AT_decl_file
+ .byte 11 ## DW_FORM_data1
+ .byte 59 ## DW_AT_decl_line
+ .byte 11 ## DW_FORM_data1
+ .byte 39 ## DW_AT_prototyped
+ .byte 25 ## DW_FORM_flag_present
+ .byte 73 ## DW_AT_type
+ .byte 19 ## DW_FORM_ref4
+ .byte 63 ## DW_AT_external
+ .byte 25 ## DW_FORM_flag_present
+ .byte 0 ## EOM(1)
+ .byte 0 ## EOM(2)
+ .byte 3 ## Abbreviation Code
+ .byte 52 ## DW_TAG_variable
+ .byte 0 ## DW_CHILDREN_no
+ .byte 2 ## DW_AT_location
+ .byte 24 ## DW_FORM_exprloc
+ .byte 3 ## DW_AT_name
+ .byte 14 ## DW_FORM_strp
+ .byte 58 ## DW_AT_decl_file
+ .byte 11 ## DW_FORM_data1
+ .byte 59 ## DW_AT_decl_line
+ .byte 11 ## DW_FORM_data1
+ .byte 73 ## DW_AT_type
+ .byte 19 ## DW_FORM_ref4
+ .byte 0 ## EOM(1)
+ .byte 0 ## EOM(2)
+ .byte 4 ## Abbreviation Code
+ .byte 36 ## DW_TAG_base_type
+ .byte 0 ## DW_CHILDREN_no
+ .byte 3 ## DW_AT_name
+ .byte 14 ## DW_FORM_strp
+ .byte 62 ## DW_AT_encoding
+ .byte 11 ## DW_FORM_data1
+ .byte 11 ## DW_AT_byte_size
+ .byte 11 ## DW_FORM_data1
+ .byte 0 ## EOM(1)
+ .byte 0 ## EOM(2)
+ .byte 0 ## EOM(3)
+ .section __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+ .long 87 ## Length of Unit
+ .short 5 ## DWARF version number
+ .byte 1 ## DWARF Unit Type
+ .byte 8 ## Address Size (in bytes)
+Lset0 = Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+ .long Lset0
+ .byte 1 ## Abbrev [1] 0xc:0x4f DW_TAG_compile_unit
+ .long 0 ## DW_AT_producer
+ .short 12 ## DW_AT_language
+ .long 55 ## DW_AT_name
+Lset1 = Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+ .long Lset1
+ .long 63 ## DW_AT_comp_dir
+ .quad Lfunc_begin0 ## DW_AT_low_pc
+Lset2 = Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
+ .long Lset2
+ .byte 2 ## Abbrev [2] 0x2b:0x28 DW_TAG_subprogram
+ .quad Lfunc_begin0 ## DW_AT_low_pc
+Lset3 = Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
+ .long Lset3
+ .byte 1 ## DW_AT_frame_base
+ .byte 86
+ .long 97 ## DW_AT_name
+ .byte 1 ## DW_AT_decl_file
+ .byte 1 ## DW_AT_decl_line
+ ## DW_AT_prototyped
+ .long 83 ## DW_AT_type
+ ## DW_AT_external
+ .byte 3 ## Abbrev [3] 0x44:0xe DW_TAG_variable
+ .byte 2 ## DW_AT_location
+ .byte 145
+ .byte 120
+ .long 106 ## DW_AT_name
+ .byte 1 ## DW_AT_decl_file
+ .byte 2 ## DW_AT_decl_line
+ .long 83 ## DW_AT_type
+ .byte 0 ## End Of Children Mark
+ .byte 4 ## Abbrev [4] 0x53:0x7 DW_TAG_base_type
+ .long 102 ## DW_AT_name
+ .byte 5 ## DW_AT_encoding
+ .byte 4 ## DW_AT_byte_size
+ .byte 0 ## End Of Children Mark
+Lcu_begin1:
+ .long 9 ## Length of Unit
+ .short 5 ## DWARF version number
+ .byte 1 ## DWARF Unit Type
+ .byte 4 ## Address Size (in bytes)
+ .long 0 ## Abbrev offset
+ .byte 0
+Ltu_begin0:
+ .long 26 ## Length of Unit -- Error: The length for this unit is too large for the .debug_info provided.
+ .short 5 ## DWARF version number
+ .byte 0 ## DWARF Unit Type
+ .byte 4 ## Address Size (in bytes)
+ .long 0
+ .quad 0
+ .long 0
+ .byte 0
+
+.subsections_via_symbols
+ .section __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0:
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