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DebugInfo: .debug_line DWARF64 support

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This adds support for the 64-bit DWARF format, but is still limited to
less than 4GB of debug data by the DataExtractor class.  Some versions
of the GNU MIPS toolchain generate 64-Bit DWARF even though it isn't
actually necessary.

Differential Revision: http://reviews.llvm.org/D1988


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238434 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ed Maste
2015-05-28 15:38:17 +00:00
parent c4e38f605e
commit 5d25204af9
4 changed files with 46 additions and 14 deletions
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27
lib/DebugInfo/DWARF/DWARFDebugLine.cpp
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@@ -25,6 +25,7 @@ void DWARFDebugLine::Prologue::clear() {
TotalLength = Version = PrologueLength = 0;
MinInstLength = MaxOpsPerInst = DefaultIsStmt = LineBase = LineRange = 0;
OpcodeBase = 0;
IsDWARF64 = false;
StandardOpcodeLengths.clear();
IncludeDirectories.clear();
FileNames.clear();
@@ -32,9 +33,9 @@ void DWARFDebugLine::Prologue::clear() {
void DWARFDebugLine::Prologue::dump(raw_ostream &OS) const {
OS << "Line table prologue:\n"
<< format(" total_length: 0x%8.8x\n", TotalLength)
<< format(" total_length: 0x%8.8" PRIx64 "\n", TotalLength)
<< format(" version: %u\n", Version)
<< format(" prologue_length: 0x%8.8x\n", PrologueLength)
<< format(" prologue_length: 0x%8.8" PRIx64 "\n", PrologueLength)
<< format(" min_inst_length: %u\n", MinInstLength)
<< format(Version >= 4 ? "max_ops_per_inst: %u\n" : "", MaxOpsPerInst)
<< format(" default_is_stmt: %u\n", DefaultIsStmt)
@@ -67,16 +68,23 @@ void DWARFDebugLine::Prologue::dump(raw_ostream &OS) const {
bool DWARFDebugLine::Prologue::parse(DataExtractor debug_line_data,
uint32_t *offset_ptr) {
const uint32_t prologue_offset = *offset_ptr;
const uint64_t prologue_offset = *offset_ptr;
clear();
TotalLength = debug_line_data.getU32(offset_ptr);
if (TotalLength == UINT32_MAX) {
IsDWARF64 = true;
TotalLength = debug_line_data.getU64(offset_ptr);
} else if (TotalLength > 0xffffff00) {
return false;
}
Version = debug_line_data.getU16(offset_ptr);
if (Version < 2)
return false;
PrologueLength = debug_line_data.getU32(offset_ptr);
const uint32_t end_prologue_offset = PrologueLength + *offset_ptr;
PrologueLength = debug_line_data.getUnsigned(offset_ptr,
sizeofPrologueLength());
const uint64_t end_prologue_offset = PrologueLength + *offset_ptr;
MinInstLength = debug_line_data.getU8(offset_ptr);
if (Version >= 4)
MaxOpsPerInst = debug_line_data.getU8(offset_ptr);
@@ -114,9 +122,10 @@ bool DWARFDebugLine::Prologue::parse(DataExtractor debug_line_data,
}
if (*offset_ptr != end_prologue_offset) {
fprintf(stderr, "warning: parsing line table prologue at 0x%8.8x should"
" have ended at 0x%8.8x but it ended at 0x%8.8x\n",
prologue_offset, end_prologue_offset, *offset_ptr);
fprintf(stderr, "warning: parsing line table prologue at 0x%8.8" PRIx64
" should have ended at 0x%8.8" PRIx64
" but it ended at 0x%8.8" PRIx64 "\n",
prologue_offset, end_prologue_offset, (uint64_t)*offset_ptr);
return false;
}
return true;
@@ -258,7 +267,7 @@ bool DWARFDebugLine::LineTable::parse(DataExtractor debug_line_data,
}
const uint32_t end_offset = debug_line_offset + Prologue.TotalLength +
sizeof(Prologue.TotalLength);
Prologue.sizeofTotalLength();
ParsingState State(this);