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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
68 lines
2.5 KiB
LLVM
68 lines
2.5 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 _MergedGlobals show up as explicit symbol reloc
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target triple = "armv7-none-linux-gnueabi"
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@var_tls = thread_local global i32 1
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@var_tls_double = thread_local global double 1.000000e+00
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@var_static = internal global i32 1
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@var_static_double = internal global double 1.000000e+00
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@var_global = global i32 1
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@var_global_double = global double 1.000000e+00
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declare i32 @mystrlen(i8* nocapture %s) nounwind
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declare void @myhextochar(i32 %n, i8* nocapture %buffer)
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declare void @__aeabi_read_tp() nounwind
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declare void @__nacl_read_tp() nounwind
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define i32 @main(i32 %argc, i8** nocapture %argv) nounwind {
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entry:
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switch i32 %argc, label %bb3 [
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i32 555, label %bb
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i32 6666, label %bb2
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]
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bb: ; preds = %entry
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store volatile i32 11, i32* @var_tls, align 4
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store volatile double 2.200000e+01, double* @var_tls_double, align 8
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store volatile i32 33, i32* @var_static, align 4
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store volatile double 4.400000e+01, double* @var_static_double, align 8
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store volatile i32 55, i32* @var_global, align 4
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store volatile double 6.600000e+01, double* @var_global_double, align 8
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br label %bb3
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bb2: ; preds = %entry
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ret i32 add (i32 add (i32 add (i32 ptrtoint (i32* @var_tls to i32), i32 add (i32 ptrtoint (i32* @var_static to i32), i32 ptrtoint (i32* @var_global to i32))), i32 ptrtoint (double* @var_tls_double to i32)), i32 add (i32 ptrtoint (double* @var_static_double to i32), i32 ptrtoint (double* @var_global_double to i32)))
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bb3: ; preds = %bb, %entry
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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 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: 0x{{[0-9,A-F]+}} R_ARM_MOVW_ABS_NC _MergedGlobals
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; OBJ: }
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; OBJ: ]
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