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Don't produce a "DW_CFA_advance_loc 0". 

llvm-svn: 122609
This commit is contained in:
Rafael Espindola 2010-12-28 23:38:03 +00:00
parent 146666eabb
commit 6bbfb6c06c
2 changed files with 50 additions and 1 deletions
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3
llvm/lib/MC/MCDwarf.cpp
View File

@ -780,7 +780,8 @@ void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
raw_ostream &OS) {
// FIXME: Assumes the code alignment factor is 1.
if (isUIntN(6, AddrDelta)) {
if (AddrDelta == 0) {
} else if (isUIntN(6, AddrDelta)) {
uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
OS << Opcode;
} else if (isUInt<8>(AddrDelta)) {

48
llvm/test/MC/ELF/cfi-zero-addr-delta.s Normal file
View File

@ -0,0 +1,48 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck %s
// Test that we don't produce a DW_CFA_advance_loc 0
f:
.cfi_startproc
nop
.cfi_def_cfa_offset 16
nop
.cfi_remember_state
.cfi_def_cfa_offset 8
nop
.cfi_restore_state
nop
.cfi_endproc
// CHECK: (('sh_name', 0x00000012) # '.eh_frame'
// CHECK-NEXT: ('sh_type', 0x00000001)
// CHECK-NEXT: ('sh_flags', 0x00000002)
// CHECK-NEXT: ('sh_addr', 0x00000000)
// CHECK-NEXT: ('sh_offset', 0x00000048)
// CHECK-NEXT: ('sh_size', 0x00000038)
// CHECK-NEXT: ('sh_link', 0x00000000)
// CHECK-NEXT: ('sh_info', 0x00000000)
// CHECK-NEXT: ('sh_addralign', 0x00000008)
// CHECK-NEXT: ('sh_entsize', 0x00000000)
// CHECK-NEXT: ('_section_data', '14000000 00000000 017a5200 01781001 1b0c0708 90010000 1c000000 1c000000 00000000 04000000 00410e10 410a0e08 410b0000 00000000')
// CHECK-NEXT: ),
// CHECK: (('sh_name', 0x00000036) # '.rela.eh_frame'
// CHECK-NEXT: ('sh_type', 0x00000004)
// CHECK-NEXT: ('sh_flags', 0x00000000)
// CHECK-NEXT: ('sh_addr', 0x00000000)
// CHECK-NEXT: ('sh_offset', 0x00000160)
// CHECK-NEXT: ('sh_size', 0x00000018)
// CHECK-NEXT: ('sh_link', 0x00000006)
// CHECK-NEXT: ('sh_info', 0x00000004)
// CHECK-NEXT: ('sh_addralign', 0x00000008)
// CHECK-NEXT: ('sh_entsize', 0x00000018)
// CHECK-NEXT: ('_relocations', [
// CHECK-NEXT: # Relocation 0x00000000
// CHECK-NEXT: (('r_offset', 0x00000020)
// CHECK-NEXT: ('r_sym', 0x00000002)
// CHECK-NEXT: ('r_type', 0x00000002)
// CHECK-NEXT: ('r_addend', 0x00000000)
// CHECK-NEXT: ),
// CHECK-NEXT: ])
// CHECK-NEXT: ),