[llvm] [llvm-readobj] Dump callgraph section info for ELF (PR #157499)

[Prabhu Rajasekaran via llvm-commits]

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@@ -0,0 +1,759 @@
+## Tests how --call-graph-info prints the call graph information.
+# RUN: yaml2obj --docnum=1 %s -o %t
+# RUN: llvm-readelf --call-graph-info %t 2>&1 | FileCheck %s --match-full-lines -DFILE=%t
+# RUN: llvm-readelf --elf-output-style=LLVM --call-graph-info %t 2>&1 | FileCheck %s --match-full-lines --check-prefix=LLVM -DFILE=%t
+# RUN: llvm-readelf --elf-output-style=JSON --pretty-print --call-graph-info %t 2>&1 | FileCheck %s --match-full-lines --check-prefix=JSON -DFILE=%t
+
+# Yaml input is obtained by compiling the below source to object with:
+#   clang -fexperimental-call-graph-section test.c -o test.o
+# then to yaml with:
+#   obj2yaml test.o > test.yaml
+# Remove ProgramHeaders if obj2yaml fails.
+
+# The content of the .callgraph section is fixed with this yaml in raw format.
+
+# Source:
+#   void foo() {}
+#
+#   void bar() {}
+#
+#   int baz(char a) {
+#     return 0;
+#   }
+#
+#   int main() {
+#     // Indirect calls.
+#     void (*fp_foo)() = foo;
+#     fp_foo();
+#
+#     void (*fp_bar)() = bar;
+#     fp_bar();
+#
+#     char a;
+#     int (*fp_baz)(char) = baz;
+#     fp_baz(a);
+#
+#     // Direct calls.
+#     foo();
+#     bar();
+#     baz(a);
+#
+#     return 0;
+#   }
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Prabhuk wrote:

Done.

https://github.com/llvm/llvm-project/pull/157499