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[MC/Dwarf] Encode DW_CFA_advance_loc in target endianess.

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This matches GNU as output.

llvm-svn: 239911
This commit is contained in:
Benjamin Kramer 2015-06-17 15:14:35 +00:00
parent 90971b6321
commit caf0e3931e
2 changed files with 76 additions and 9 deletions
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17
lib/MC/MCDwarf.cpp
View File

@ -1590,18 +1590,17 @@ void MCDwarfFrameEmitter::EncodeAdvanceLoc(MCContext &Context,
OS << uint8_t(dwarf::DW_CFA_advance_loc1);
OS << uint8_t(AddrDelta);
} else if (isUInt<16>(AddrDelta)) {
// FIXME: check what is the correct behavior on a big endian machine.
OS << uint8_t(dwarf::DW_CFA_advance_loc2);
OS << uint8_t( AddrDelta & 0xff);
OS << uint8_t((AddrDelta >> 8) & 0xff);
if (Context.getAsmInfo()->isLittleEndian())
support::endian::Writer<support::little>(OS).write<uint16_t>(AddrDelta);
else
support::endian::Writer<support::big>(OS).write<uint16_t>(AddrDelta);
} else {
// FIXME: check what is the correct behavior on a big endian machine.
assert(isUInt<32>(AddrDelta));
OS << uint8_t(dwarf::DW_CFA_advance_loc4);
OS << uint8_t( AddrDelta & 0xff);
OS << uint8_t((AddrDelta >> 8) & 0xff);
OS << uint8_t((AddrDelta >> 16) & 0xff);
OS << uint8_t((AddrDelta >> 24) & 0xff);
if (Context.getAsmInfo()->isLittleEndian())
support::endian::Writer<support::little>(OS).write<uint32_t>(AddrDelta);
else
support::endian::Writer<support::big>(OS).write<uint32_t>(AddrDelta);
}
}

68
test/MC/Mips/cfi-advance-loc.s Normal file
View File

@ -0,0 +1,68 @@
// RUN: llvm-mc -filetype=obj -triple mipsel-pc-Linux-gnu %s -o - | llvm-readobj -s -sd | FileCheck %s -check-prefix=CHECK-LE
// RUN: llvm-mc -filetype=obj -triple mips-pc-linux-gnu %s -o - | llvm-readobj -s -sd | FileCheck %s -check-prefix=CHECK-BE
// test that this produces a correctly encoded cfi_advance_loc for both endians.
f:
.cfi_startproc
nop
.zero 252
// DW_CFA_advance_loc2: 256 to 00000100
.cfi_def_cfa_offset 8
nop
.cfi_endproc
g:
.cfi_startproc
nop
.zero 65532
// DW_CFA_advance_loc4: 65536 to 00010104
.cfi_def_cfa_offset 8
nop
.cfi_endproc
// CHECK-LE: Section {
// CHECK-LE: Index: 7
// CHECK-LE: Name: .eh_frame (44)
// CHECK-LE-NEXT: Type: SHT_PROGBITS (0x1)
// CHECK-LE-NEXT: Flags [ (0x2)
// CHECK-LE-NEXT: SHF_ALLOC (0x2)
// CHECK-LE-NEXT: ]
// CHECK-LE-NEXT: Address: 0x0
// CHECK-LE-NEXT: Offset: 0x10180
// CHECK-LE-NEXT: Size: 68
// CHECK-LE-NEXT: Link: 0
// CHECK-LE-NEXT: Info: 0
// CHECK-LE-NEXT: AddressAlignment: 4
// CHECK-LE-NEXT: EntrySize: 0
// CHECK-LE-NEXT: SectionData (
// CHECK-LE-NEXT: 0000: 10000000 00000000 017A5200 017C1F01
// CHECK-LE-NEXT: 0010: 0B0C1D00 14000000 18000000 00000000
// CHECK-LE-NEXT: 0020: 04010000 00030001 0E080000 14000000
// CHECK-LE-NEXT: 0030: 30000000 04010000 04000100 00040000
// CHECK-LE-NEXT: 0040: 01000E08
// CHECK-LE-NEXT: )
// CHECK-LE-NEXT: }
// CHECK-BE: Section {
// CHECK-BE: Index: 7
// CHECK-BE: Name: .eh_frame (44)
// CHECK-BE-NEXT: Type: SHT_PROGBITS (0x1)
// CHECK-BE-NEXT: Flags [ (0x2)
// CHECK-BE-NEXT: SHF_ALLOC (0x2)
// CHECK-BE-NEXT: ]
// CHECK-BE-NEXT: Address: 0x0
// CHECK-BE-NEXT: Offset: 0x10180
// CHECK-BE-NEXT: Size: 68
// CHECK-BE-NEXT: Link: 0
// CHECK-BE-NEXT: Info: 0
// CHECK-BE-NEXT: AddressAlignment: 4
// CHECK-BE-NEXT: EntrySize: 0
// CHECK-BE-NEXT: SectionData (
// CHECK-BE-NEXT: 0000: 00000010 00000000 017A5200 017C1F01
// CHECK-BE-NEXT: 0010: 0B0C1D00 00000014 00000018 00000000
// CHECK-BE-NEXT: 0020: 00000104 00030100 0E080000 00000014
// CHECK-BE-NEXT: 0030: 00000030 00000104 00010004 00040001
// CHECK-BE-NEXT: 0040: 00000E08
// CHECK-BE-NEXT: )
// CHECK-BE-NEXT: }