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[DebugInfo] Bail out if making no progress dumping line tables.

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llvm-svn: 319564
This commit is contained in:
Paul Robinson 2017-12-01 18:25:30 +00:00
parent fe5e98079f
commit f7dfbc90e5
2 changed files with 101 additions and 0 deletions
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4
lib/DebugInfo/DWARF/DWARFContext.cpp
View File

@ -357,12 +357,16 @@ void DWARFContext::dump(
// Verbose dumping is done during parsing and not on the intermediate
// representation.
OS << "debug_line[" << format("0x%8.8x", Offset) << "]\n";
unsigned OldOffset = Offset;
if (DumpOpts.Verbose) {
LineTable.parse(LineData, &Offset, U, &OS);
} else {
LineTable.parse(LineData, &Offset, U);
LineTable.dump(OS);
}
// Check for unparseable prologue, to avoid infinite loops.
if (OldOffset == Offset)
break;
}
}

97
test/DebugInfo/X86/dwarfdump-bogus-LNE.s
View File

@ -150,3 +150,100 @@ LT2_end:
# ERR: Unexpected line op length at offset 0x0000005e
# ERR-SAME: expected 0x02 found 0x01
# The above parsing errors still let us move to the next unit.
# If the prologue is bogus, we need to bail out because we can't
# even find the next unit.
# DWARF v4 line-table header #3.
LT3_start:
.long LT3_end-LT3_version # Length of Unit (DWARF-32 format)
LT3_version:
.short 4 # DWARF version number
.long LT3_header_end-LT3_params # Length of Prologue
LT3_params:
.byte 1 # Minimum Instruction Length
.byte 1 # Maximum Operations per Instruction
.byte 1 # Default is_stmt
.byte -5 # Line Base
.byte 14 # Line Range
.byte 13 # Opcode Base
.byte 0 # Standard Opcode Lengths
.byte 1
.byte 1
.byte 1
.byte 1
.byte 0
.byte 0
.byte 0
.byte 1
.byte 0
.byte 0
.byte 1
# No directories.
.byte 0
# No files.
.byte 0
# Extra junk at the end of the prologue, so the length isn't right.
.long 0
LT3_header_end:
# Real opcode and operand.
.byte 0
.byte 9
.byte 2 # DW_LNE_set_address
.quad .text
# Real opcode with incorrect length.
.byte 0
.byte 2 # Wrong length, should be 1.
.byte 1 # DW_LNE_end_sequence
LT3_end:
# We should have bailed out above, so never see this in the dump.
# DWARF v4 line-table header #4.
LT4_start:
.long LT4_end-LT4_version # Length of Unit (DWARF-32 format)
LT4_version:
.short 4 # DWARF version number
.long LT4_header_end-LT4_params # Length of Prologue
LT4_params:
.byte 1 # Minimum Instruction Length
.byte 1 # Maximum Operations per Instruction
.byte 1 # Default is_stmt
.byte -5 # Line Base
.byte 14 # Line Range
.byte 13 # Opcode Base
.byte 0 # Standard Opcode Lengths
.byte 1
.byte 1
.byte 1
.byte 1
.byte 0
.byte 0
.byte 0
.byte 1
.byte 0
.byte 0
.byte 1
# No directories.
.byte 0
# No files.
.byte 0
LT4_header_end:
# Real opcode and operand.
.byte 0
.byte 9
.byte 2 # DW_LNE_set_address
.quad .text
# Real opcode with correct length.
.byte 0
.byte 1
.byte 1 # DW_LNE_end_sequence
LT4_end:
# Look for the dump of unit 3, and don't want unit 4.
# CHECK: Line table prologue:
# CHECK-NOT: Line table prologue:
# And look for the error message.
# ERR: warning: parsing line table prologue at 0x0000005f should have
# ERR-SAME: ended at 0x00000081 but it ended at 0x0000007d