[llvm] [llvm-objdump] Rework .gnu.version_d dumping (PR #128434)

[James Henderson via llvm-commits]

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@@ -0,0 +1,50 @@
+## Adapted from test/llvm-readobj/ELF/verdef-invalid.test
+## Check that we report a warning when a SHT_GNU_verdef section contains a version definition
+## that refers to an auxiliary entry that goes past the end of the section.
+
+# RUN: yaml2obj %s -o %t5
+# RUN: llvm-objdump -p %t5 2>&1 | FileCheck %s --check-prefix=AUX-PAST-END -DFILE=%t5
+# RUN: llvm-objdump -p %t5 2>&1 | FileCheck %s --check-prefix=AUX-PAST-END -DFILE=%t5
+
+# AUX-PAST-END: warning: '[[FILE]]': invalid SHT_GNU_verdef section with index 1: version definition 1 refers to an auxiliary entry that goes past the end of the section
+
+--- !ELF
+FileHeader:
+  Class: ELFCLASS64
+  Data:  ELFDATA2LSB
+  Type:  ET_DYN
+Sections:
+  - Name: .gnu.version_d
+    Type: SHT_GNU_verdef
+    Entries:
+      - Names:
+          - FOO
+    ShSize: 21
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jh7370 wrote:

What should the size actually be (perhaps worth a comment, or even a test case showing that)?

https://github.com/llvm/llvm-project/pull/128434