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[DebugInfo] Dump raw data in a case of decoding error of an expression. 

It looks like that was an initial intention, but some code paths in
`DWARFExpression::Operation::extract()` did not initialize `EndOffset`
properly.

Differential Revision: https://reviews.llvm.org/D79622
This commit is contained in:
Igor Kudrin 2020-05-09 10:03:38 +07:00
parent c90e198107
commit c6ed1fcf24
3 changed files with 5 additions and 7 deletions
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6
llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
View File

@ -120,13 +120,12 @@ static DWARFExpression::Operation::Description getOpDesc(unsigned OpCode) {
bool DWARFExpression::Operation::extract(DataExtractor Data,
uint8_t AddressSize, uint64_t Offset,
Optional<DwarfFormat> Format) {
EndOffset = Offset;
Opcode = Data.getU8(&Offset);
Desc = getOpDesc(Opcode);
if (Desc.Version == Operation::DwarfNA) {
EndOffset = Offset;
if (Desc.Version == Operation::DwarfNA)
return false;
}
for (unsigned Operand = 0; Operand < 2; ++Operand) {
unsigned Size = Desc.Op[Operand];
@ -135,7 +134,6 @@ bool DWARFExpression::Operation::extract(DataExtractor Data,
if (Size == Operation::SizeNA)
break;
EndOffset = Offset;
switch (Size & ~Operation::SignBit) {
case Operation::Size1:
Operands[Operand] = Data.getU8(&Offset);

2
llvm/test/DebugInfo/X86/DW_OP_call_ref_unexpected.s
View File

@ -6,7 +6,7 @@
# CHECK: .debug_loc contents:
# CHECK-NEXT: 0x00000000:
# CHECK-NEXT: (0x0000000000000000, 0x0000000000000015): <decoding error>
# CHECK-NEXT: (0x0000000000000000, 0x0000000000000015): <decoding error> 9a ff 00 00 00
.section .debug_loc, "", @progbits
.quad 0 # Beginning address offset

4
llvm/test/tools/llvm-dwarfdump/X86/verify_broken_exprloc.s
View File

@ -3,13 +3,13 @@
## Check we don't crash when parsing invalid expression opcode.
# RUN: llvm-dwarfdump %t | FileCheck %s
# CHECK: DW_TAG_GNU_call_site_parameter
# CHECK-NEXT: DW_AT_location (<decoding error>)
# CHECK-NEXT: DW_AT_location (<decoding error> ff)
## Check verifier reports an error.
# RUN: not llvm-dwarfdump -verify %t 2>&1 | FileCheck %s --check-prefix=VERIFY
# VERIFY: DIE contains invalid DWARF expression:
# VERIFY: DW_TAG_GNU_call_site_parameter
# VERIFY-NEXT: DW_AT_location (<decoding error>)
# VERIFY-NEXT: DW_AT_location (<decoding error> ff)
.section .debug_info,"",@progbits
.long 0x12