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[MachO] Fix codegen of alias of alias.

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Fixes PR33316.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305012 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov 2017-06-08 20:49:03 +00:00
parent 5c9336eb2b
commit 8efab37a20
3 changed files with 20 additions and 4 deletions
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4
lib/MC/MCExpr.cpp
View File

@ -655,8 +655,12 @@ bool MCExpr::evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
// the OS X assembler will completely drop the 4. We should probably
// include it in the relocation or produce an error if that is not
// possible.
// Allow constant expressions.
if (!A && !B)
return true;
// Allows aliases with zero offset.
if (Res.getConstant() == 0 && (!A || !B))
return true;
}
}

12
test/MC/MachO/alias.s Normal file
View File

@ -0,0 +1,12 @@
// RUN: llvm-mc -triple x86_64-apple-macosx10.12.0 %s -filetype=obj | llvm-readobj -r | FileCheck %s
l_a:
l_b = l_a
l_c = l_b
.long l_c
// CHECK: Relocations [
// CHECK-NEXT: Section __text {
// CHECK-NEXT: 0x0 0 2 1 X86_64_RELOC_UNSIGNED 0 l_c
// CHECK-NEXT: }
// CHECK-NEXT: ]

8
test/MC/MachO/variable-exprs.s
View File

@ -110,8 +110,8 @@ Lt0_x = Lt0_a - Lt0_b
// CHECK-I386: 0x2C 0 2 0 GENERIC_RELOC_VANILLA 0 __data
// CHECK-I386: 0x28 0 2 0 GENERIC_RELOC_VANILLA 0 __data
// CHECK-I386: 0x24 0 2 1 GENERIC_RELOC_VANILLA 0 d3
// CHECK-I386: 0x20 0 2 1 GENERIC_RELOC_VANILLA 0 d2
// CHECK-I386: 0x1C 0 2 1 GENERIC_RELOC_VANILLA 0 d
// CHECK-I386: 0x20 0 2 1 GENERIC_RELOC_VANILLA 0 d{{$}}
// CHECK-I386: 0x1C 0 2 1 GENERIC_RELOC_VANILLA 0 d{{$}}
// CHECK-I386: 0x18 0 2 n/a GENERIC_RELOC_VANILLA 1 0x5
// CHECK-I386: 0x14 0 2 0 GENERIC_RELOC_VANILLA 0 __data
// CHECK-I386: 0x10 0 2 0 GENERIC_RELOC_VANILLA 0 __data
@ -319,8 +319,8 @@ Lt0_x = Lt0_a - Lt0_b
// CHECK-X86_64: 0x2C 0 2 1 X86_64_RELOC_UNSIGNED 0 g
// CHECK-X86_64: 0x28 0 2 1 X86_64_RELOC_UNSIGNED 0 f
// CHECK-X86_64: 0x24 0 2 1 X86_64_RELOC_UNSIGNED 0 d3
// CHECK-X86_64: 0x20 0 2 1 X86_64_RELOC_UNSIGNED 0 d2
// CHECK-X86_64: 0x1C 0 2 1 X86_64_RELOC_UNSIGNED 0 d
// CHECK-X86_64: 0x20 0 2 1 X86_64_RELOC_UNSIGNED 0 d{{$}}
// CHECK-X86_64: 0x1C 0 2 1 X86_64_RELOC_UNSIGNED 0 d{{$}}
// CHECK-X86_64: 0x18 0 2 1 X86_64_RELOC_UNSIGNED 0 a
// CHECK-X86_64: 0x14 0 2 1 X86_64_RELOC_UNSIGNED 0 e
// CHECK-X86_64: 0x10 0 2 1 X86_64_RELOC_UNSIGNED 0 b