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7486d92a6c
For COFF and MachO, sections semantically have relocations that apply to them. That is not the case on ELF. In relocatable objects (.o), a section with relocations in ELF has offsets to another section where the relocations should be applied. In dynamic objects and executables, relocations don't have an offset, they have a virtual address. The section sh_info may or may not point to another section, but that is not actually used for resolving the relocations. This patch exposes that in the ObjectFile API. It has the following advantages: * Most (all?) clients can handle this more efficiently. They will normally walk all relocations, so doing an effort to iterate in a particular order doesn't save time. * llvm-readobj now prints relocations in the same way the native readelf does. * probably most important, relocations that don't point to any section are now visible. This is the case of relocations in the rela.dyn section. See the updated relocation-executable.test for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182908 91177308-0d34-0410-b5e6-96231b3b80d8
49 lines
1.9 KiB
LLVM
49 lines
1.9 KiB
LLVM
;; RUN: llc -mtriple=armv7-linux-gnueabi -O3 \
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;; RUN: -mcpu=cortex-a8 -mattr=-neon -mattr=+vfp2 -arm-reserve-r9 \
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;; RUN: -filetype=obj %s -o - | \
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;; RUN: llvm-readobj -r | FileCheck -check-prefix=OBJ %s
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;; FIXME: This file needs to be in .s form!
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;; The args to llc are there to constrain the codegen only.
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;;
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;; Ensure no regression on ARM/gcc compatibility for
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;; emitting explicit symbol relocs for nonexternal symbols
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;; versus section symbol relocs (with offset) -
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;;
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;; Default llvm behavior is to emit as section symbol relocs nearly
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;; everything that is not an undefined external. Unfortunately, this
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;; diverges from what codesourcery ARM/gcc does!
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;;
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;; Tests that reloc to .L.str* show up as explicit symbols
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target triple = "armv7-none-linux-gnueabi"
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@.str = private constant [7 x i8] c"@null\0A\00", align 4
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@.str1 = private constant [8 x i8] c"@write\0A\00", align 4
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@.str2 = private constant [13 x i8] c"hello worldn\00", align 4
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@.str3 = private constant [7 x i8] c"@exit\0A\00", align 4
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declare i32 @mystrlen(i8* nocapture %s) nounwind readonly
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declare void @myhextochar(i32 %n, i8* nocapture %buffer) nounwind
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define i32 @main() nounwind {
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entry:
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%0 = tail call i32 (...)* @write(i32 1, i8* getelementptr inbounds ([7 x i8]* @.str, i32 0, i32 0), i32 6) nounwind
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%1 = tail call i32 (...)* @write(i32 1, i8* getelementptr inbounds ([8 x i8]* @.str1, i32 0, i32 0), i32 7) nounwind
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%2 = tail call i32 (...)* @write(i32 1, i8* getelementptr inbounds ([13 x i8]* @.str2, i32 0, i32 0), i32 12) nounwind
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%3 = tail call i32 (...)* @write(i32 1, i8* getelementptr inbounds ([7 x i8]* @.str3, i32 0, i32 0), i32 6) nounwind
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tail call void @exit(i32 55) noreturn nounwind
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unreachable
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}
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declare i32 @write(...)
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declare void @exit(i32) noreturn nounwind
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;; OBJ: Relocations [
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;; OBJ: Section (2) .rel.text {
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;; OBJ-NEXT: 0x{{[0-9,A-F]+}} R_ARM_MOVW_ABS_NC .L.str
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;; OBJ: }
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;; OBJ: ]
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