Change how we iterate over relocations on ELF.

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

3 files changed, 7 insertions, 7 deletions

diff --git a/test/CodeGen/ARM/2010-11-30-reloc-movt.ll b/test/CodeGen/ARM/2010-11-30-reloc-movt.ll
index 9eecd045bf..6bea7b88e8 100644
--- a/test/CodeGen/ARM/2010-11-30-reloc-movt.ll
+++ b/test/CodeGen/ARM/2010-11-30-reloc-movt.ll
@@ -11,15 +11,15 @@ entry:
   ret i32 %0
 ; OBJ:        Section {
 ; OBJ:          Name: .text
+; OBJ:          SectionData (
+; OBJ-NEXT:       0000: 00482DE9 000000E3 000040E3 FEFFFFEB
+; OBJ-NEXT:       0010: 0088BDE8
+; OBJ-NEXT:     )
 ; OBJ:          Relocations [
 ; OBJ-NEXT:       0x4 R_ARM_MOVW_ABS_NC a
 ; OBJ-NEXT:       0x8 R_ARM_MOVT_ABS
 ; OBJ-NEXT:       0xC R_ARM_CALL foo
 ; OBJ-NEXT:     ]
-; OBJ-NEXT:     SectionData (
-; OBJ-NEXT:       0000: 00482DE9 000000E3 000040E3 FEFFFFEB
-; OBJ-NEXT:       0010: 0088BDE8
-; OBJ-NEXT:     )
 
 }
 
diff --git a/test/CodeGen/ARM/ehabi-mc-compact-pr0.ll b/test/CodeGen/ARM/ehabi-mc-compact-pr0.ll
index 11f3e6db0f..637a989240 100644
--- a/test/CodeGen/ARM/ehabi-mc-compact-pr0.ll
+++ b/test/CodeGen/ARM/ehabi-mc-compact-pr0.ll
@@ -44,6 +44,6 @@ declare void @_Z15throw_exceptionv()
 ; CHECK-FP-ELIM-NEXT: 0000 00000000 b0808480
 ; CHECK-FP-ELIM-NOT: section .ARM.extab
 
-; CHECK-RELOC: RELOCATION RECORDS FOR [.ARM.exidx]
+; CHECK-RELOC: RELOCATION RECORDS FOR [.rel.ARM.exidx]
 ; CHECK-RELOC-NEXT: 0 R_ARM_PREL31 .text
 ; CHECK-RELOC-NEXT: 0 R_ARM_NONE __aeabi_unwind_cpp_pr0
diff --git a/test/CodeGen/ARM/ehabi-mc-compact-pr1.ll b/test/CodeGen/ARM/ehabi-mc-compact-pr1.ll
index 79dba084c0..5a54889d6a 100644
--- a/test/CodeGen/ARM/ehabi-mc-compact-pr1.ll
+++ b/test/CodeGen/ARM/ehabi-mc-compact-pr1.ll
@@ -53,10 +53,10 @@ declare void @_Z15throw_exceptioni(i32)
 ; CHECK-FP-ELIM-NEXT: 0000 00000000 b0838480
 ; CHECK-FP-ELIM-NOT: section .ARM.extab
 
-; CHECK-RELOC: RELOCATION RECORDS FOR [.ARM.exidx]
+; CHECK-RELOC: RELOCATION RECORDS FOR [.rel.ARM.exidx]
 ; CHECK-RELOC-NEXT: 0 R_ARM_PREL31 .text
 ; CHECK-RELOC-NEXT: 0 R_ARM_NONE __aeabi_unwind_cpp_pr1
 
-; CHECK-FP-ELIM-RELOC: RELOCATION RECORDS FOR [.ARM.exidx]
+; CHECK-FP-ELIM-RELOC: RELOCATION RECORDS FOR [.rel.ARM.exidx]
 ; CHECK-FP-ELIM-RELOC-NEXT: 0 R_ARM_PREL31 .text
 ; CHECK-FP-ELIM-RELOC-NEXT: 0 R_ARM_NONE __aeabi_unwind_cpp_pr0