[llvm-readobj/llvm-readelf] - Implement GNU style dumper of the SHT_GNU_verneed section.

It was not implemented yet, we had only LLVM style dumper implemented.
Section description is here: https://refspecs.linuxfoundation.org/LSB_2.0.1/LSB-Core/LSB-Core/symverrqmts.html

Differential revision: https://reviews.llvm.org/D62516

llvm-svn: 362080

2 files changed, 117 insertions, 3 deletions

diff --git a/llvm/test/tools/llvm-readobj/elf-verneed-flags.yaml b/llvm/test/tools/llvm-readobj/elf-verneed-flags.yaml
new file mode 100644
index 00000000000..e121e38ec75
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/elf-verneed-flags.yaml
@@ -0,0 +1,107 @@
+## Check how llvm-readobj/llvm-readelf tools dump the flags of SHT_GNU_verneed
+## section entries.
+
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-readobj -V %t | FileCheck %s --check-prefix=LLVM-VERDEF
+# RUN: llvm-readelf -V %t | FileCheck %s --check-prefix=GNU-VERDEF
+
+# LLVM-VERDEF:      SHT_GNU_verneed {
+# LLVM-VERDEF-NEXT:   Dependency {
+# LLVM-VERDEF-NEXT:     Version: 1
+# LLVM-VERDEF-NEXT:     Count: 6
+# LLVM-VERDEF-NEXT:     FileName: dso.so.0
+# LLVM-VERDEF-NEXT:     Entries [
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: Base (0x1)
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: base
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: Weak (0x2)
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: weak
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: Info (0x4)
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: info
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: 0x7
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: all
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: 0x8
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: unknown
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:       Entry {
+# LLVM-VERDEF-NEXT:         Hash: 0
+# LLVM-VERDEF-NEXT:         Flags: 0xF
+# LLVM-VERDEF-NEXT:         Index: 0
+# LLVM-VERDEF-NEXT:         Name: all_and_unknown
+# LLVM-VERDEF-NEXT:       }
+# LLVM-VERDEF-NEXT:     ]
+# LLVM-VERDEF-NEXT:   }
+# LLVM-VERDEF-NEXT: }
+
+# GNU-VERDEF:      Version needs section '.gnu.version_r' contains 1 entries:
+# GNU-VERDEF-NEXT:  Addr: 0000000000000000  Offset: 0x000200  Link: 6 (.dynstr)
+# GNU-VERDEF-NEXT:   0x0000: Version: 1  File: dso.so.0  Cnt: 6
+# GNU-VERDEF-NEXT:   0x0010:   Name: base  Flags: BASE  Version: 0
+# GNU-VERDEF-NEXT:   0x0020:   Name: weak  Flags: WEAK  Version: 0
+# GNU-VERDEF-NEXT:   0x0030:   Name: info  Flags: INFO  Version: 0
+# GNU-VERDEF-NEXT:   0x0040:   Name: all  Flags: BASE | WEAK | INFO  Version: 0
+# GNU-VERDEF-NEXT:   0x0050:   Name: unknown  Flags: <unknown>  Version: 0
+# GNU-VERDEF-NEXT:   0x0060:   Name: all_and_unknown  Flags: BASE | WEAK | INFO | <unknown>  Version: 0
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
+  Entry:           0x0000000000201000
+Sections:
+  - Name:            .gnu.version_r
+    Type:            SHT_GNU_verneed
+    Link:            .dynstr
+    Info:            0x0000000000000001
+    Dependencies:
+      - Version:         1
+        File:            dso.so.0
+        Entries:
+          - Name:            base
+            Hash:            0
+            Flags:           0x1
+            Other:           0
+          - Name:            weak
+            Hash:            0
+            Flags:           0x2
+            Other:           0
+          - Name:            info
+            Hash:            0
+            Flags:           0x4
+            Other:           0
+          - Name:            all
+            Hash:            0
+            Flags:           0x7
+            Other:           0
+          - Name:            unknown
+            Hash:            0
+            Flags:           0x8
+            Other:           0
+          - Name:            all_and_unknown
+            Hash:            0
+            Flags:           0xf
+            Other:           0
+## Needed to trigger .dynstr creation, which is required by .gnu.version_r
+DynamicSymbols:
+  - Name:    f1
+    Binding: STB_GLOBAL
diff --git a/llvm/test/tools/llvm-readobj/elf-versioninfo.test b/llvm/test/tools/llvm-readobj/elf-versioninfo.test
index 42c158693d8..cca5bb1b409 100644
--- a/llvm/test/tools/llvm-readobj/elf-versioninfo.test
+++ b/llvm/test/tools/llvm-readobj/elf-versioninfo.test
@@ -173,6 +173,13 @@ DynamicSymbols:
 # GNU-NEXT:  Addr: 0000000000000000  Offset: 0x000280  Link: 7 (.dynsym)
 # GNU-NEXT:   000:   0 (*local*) 2 (VERSION1) 3 (VERSION2) 4 (v1)
 # GNU-NEXT:   004:   5 (v2)      6 (v3)
-
-# GNU: Dumper for .gnu.version_d is not implemented
-# GNU: Dumper for .gnu.version_r is not implemented
+# GNU-EMPTY:
+# GNU-NEXT: Dumper for .gnu.version_d is not implemented
+# GNU-EMPTY:
+# GNU-NEXT: Version needs section '.gnu.version_r' contains 2 entries:
+# GNU-NEXT:  Addr: 0000000000000000  Offset: 0x0002cc  Link: 8 (.dynstr)
+# GNU-NEXT:   0x0000: Version: 1  File: verneed1.so.0  Cnt: 2
+# GNU-NEXT:   0x0010:   Name: v1  Flags: none  Version: 4
+# GNU-NEXT:   0x0020:   Name: v2  Flags: none  Version: 5
+# GNU-NEXT:   0x0030: Version: 1  File: verneed2.so.0  Cnt: 1
+# GNU-NEXT:   0x0040:   Name: v3  Flags: none  Version: 6