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

5 files changed, 6 insertions, 6 deletions

diff --git a/test/CodeGen/PowerPC/mcm-obj-2.ll b/test/CodeGen/PowerPC/mcm-obj-2.ll
index bc60b3baf2..a6e9855451 100644
--- a/test/CodeGen/PowerPC/mcm-obj-2.ll
+++ b/test/CodeGen/PowerPC/mcm-obj-2.ll
@@ -20,7 +20,7 @@ entry:
 ; accessing function-scoped variable si.
 ;
 ; CHECK: Relocations [
-; CHECK:   Section (1) .text {
+; CHECK:   Section (2) .rela.text {
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TOC16_HA [[SYM2:[^ ]+]]
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TOC16_LO [[SYM2]]
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TOC16_LO [[SYM2]]
diff --git a/test/CodeGen/PowerPC/mcm-obj.ll b/test/CodeGen/PowerPC/mcm-obj.ll
index 720c5fb6dd..4550c39f15 100644
--- a/test/CodeGen/PowerPC/mcm-obj.ll
+++ b/test/CodeGen/PowerPC/mcm-obj.ll
@@ -22,12 +22,12 @@ entry:
 ; accessing external variable ei.
 ;
 ; MEDIUM:      Relocations [
-; MEDIUM:        Section (1) .text {
+; MEDIUM:        Section (2) .rela.text {
 ; MEDIUM-NEXT:     0x{{[0-9,A-F]+}} R_PPC64_TOC16_HA [[SYM1:[^ ]+]]
 ; MEDIUM-NEXT:     0x{{[0-9,A-F]+}} R_PPC64_TOC16_LO_DS [[SYM1]]
 ;
 ; LARGE:       Relocations [
-; LARGE:         Section (1) .text {
+; LARGE:         Section (2) .rela.text {
 ; LARGE-NEXT:      0x{{[0-9,A-F]+}} R_PPC64_TOC16_HA [[SYM1:[^ ]+]]
 ; LARGE-NEXT:      0x{{[0-9,A-F]+}} R_PPC64_TOC16_LO_DS [[SYM1]]
 
diff --git a/test/CodeGen/PowerPC/tls-gd-obj.ll b/test/CodeGen/PowerPC/tls-gd-obj.ll
index ffc0db0d14..26cb6f28ef 100644
--- a/test/CodeGen/PowerPC/tls-gd-obj.ll
+++ b/test/CodeGen/PowerPC/tls-gd-obj.ll
@@ -22,7 +22,7 @@ entry:
 ; for the call to __tls_get_addr.
 ;
 ; CHECK: Relocations [
-; CHECK:   Section (1) .text {
+; CHECK:   Section (2) .rela.text {
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TLSGD16_HA a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TLSGD16_LO a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TLSGD          a
diff --git a/test/CodeGen/PowerPC/tls-ie-obj.ll b/test/CodeGen/PowerPC/tls-ie-obj.ll
index 0f7a352952..f24a94bdb0 100644
--- a/test/CodeGen/PowerPC/tls-ie-obj.ll
+++ b/test/CodeGen/PowerPC/tls-ie-obj.ll
@@ -21,7 +21,7 @@ entry:
 ; accessing external variable a.
 ;
 ; CHECK: Relocations [
-; CHECK:   Section (1) .text {
+; CHECK:   Section (2) .rela.text {
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TPREL16_HA    a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TPREL16_LO_DS a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TLS               a
diff --git a/test/CodeGen/PowerPC/tls-ld-obj.ll b/test/CodeGen/PowerPC/tls-ld-obj.ll
index 29ee876845..4a7d7b3f91 100644
--- a/test/CodeGen/PowerPC/tls-ld-obj.ll
+++ b/test/CodeGen/PowerPC/tls-ld-obj.ll
@@ -23,7 +23,7 @@ entry:
 ; __tls_get_addr.
 ;
 ; CHECK: Relocations [
-; CHECK:   Section (1) .text {
+; CHECK:   Section (2) .rela.text {
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TLSLD16_HA a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_GOT_TLSLD16_LO a
 ; CHECK:     0x{{[0-9,A-F]+}} R_PPC64_TLSLD          a