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Fix the encoding of negative line deltas.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118962 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-11-13 01:06:27 +00:00
parent 32c7a5e08c
commit 64185cc609
2 changed files with 33 additions and 1 deletions
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2
lib/MC/MCDwarf.cpp
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@ -179,7 +179,7 @@ static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN)
MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1);
int64_t LineDelta = it->getLine() - LastLine;
int64_t LineDelta = static_cast<int64_t>(it->getLine()) - LastLine;
MCSymbol *Label = it->getLabel();
// At this point we want to emit/create the sequence to encode the delta in

32
test/MC/ELF/debug-loc.s Normal file
View File

@ -0,0 +1,32 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
// Test that we don't regress on the size of the line info section. We used
// to handle negative line diffs incorrectly which manifested as very
// large integers being passed to DW_LNS_advance_line.
// FIXME: This size is the same as gnu as, but we can probably do a bit better.
// FIXME2: We need a debug_line dumper so that we can test the actual contents.
// CHECK: # Section 0x00000004
// CHECK-NEXT: (('sh_name', 0x00000012) # '.debug_line'
// CHECK-NEXT: ('sh_type', 0x00000001)
// CHECK-NEXT: ('sh_flags', 0x00000000)
// CHECK-NEXT: ('sh_addr', 0x00000000)
// CHECK-NEXT: ('sh_offset', 0x00000044)
// CHECK-NEXT: ('sh_size', 0x0000003d)
// CHECK-NEXT: ('sh_link', 0x00000000)
// CHECK-NEXT: ('sh_info', 0x00000000)
// CHECK-NEXT: ('sh_addralign', 0x00000001)
// CHECK-NEXT: ('sh_entsize', 0x00000000)
// CHECK-NEXT: ),
.section .debug_line,"",@progbits
.text
foo:
.file 1 "Driver.ii"
.loc 1 2 0
nop
.loc 1 4 0
nop
.loc 1 3 0
nop