[llvm] [llvm-readobj] Dump callgraph section info for ELF (PR #157499)
Prabhu Rajasekaran via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 22 15:46:34 PDT 2025
================
@@ -0,0 +1,765 @@
+## 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;
+# }
+
+# CHECK: Per-function call graph information::
+# CHECK-EMPTY:
+# CHECK-NEXT: Function:: foo
+# CHECK-NEXT: Function PC:: 0x1790
+# CHECK-NEXT: FormatVersionNumber:: 0
+# CHECK-NEXT: Function Kind:: KNOWN_TID
+# CHECK-NEXT: Function Type ID:: 0x3ecbeef531f74424
+# CHECK-NEXT: Indirect callee count:: 0
+# CHECK-NEXT: Direct callee count:: 0
+# CHECK-EMPTY:
+# CHECK-NEXT: Function:: bar
+# CHECK-NEXT: Function PC:: 0x17a0
+# CHECK-NEXT: FormatVersionNumber:: 0
+# CHECK-NEXT: Function Kind:: KNOWN_TID
+# CHECK-NEXT: Function Type ID:: 0x3ecbeef531f74424
+# CHECK-NEXT: Indirect callee count:: 0
+# CHECK-NEXT: Direct callee count:: 0
+# CHECK-EMPTY:
+# CHECK-NEXT: Function:: baz
+# CHECK-NEXT: Function PC:: 0x17b0
+# CHECK-NEXT: FormatVersionNumber:: 0
+# CHECK-NEXT: Function Kind:: KNOWN_TID
+# CHECK-NEXT: Function Type ID:: 0x308e4b8159bc8654
+# CHECK-NEXT: Indirect callee count:: 0
+# CHECK-NEXT: Direct callee count:: 0
+# CHECK-EMPTY:
+# CHECK-NEXT: Function:: main
+# CHECK-NEXT: Function PC:: 0x17c0
+# CHECK-NEXT: FormatVersionNumber:: 0
+# CHECK-NEXT: Function Kind:: KNOWN_TID
+# CHECK-NEXT: Function Type ID:: 0xfa6809609a76afca
+# CHECK-NEXT: Indirect callee count:: 3
+# CHECK-NEXT: {
+# CHECK-NEXT: callsite: 0x17ef
+# CHECK-NEXT: calleeTypeId: 0x3ecbeef531f74424
+# CHECK-NEXT: callsite: 0x17df
+# CHECK-NEXT: calleeTypeId: 0x3ecbeef531f74424
+# CHECK-NEXT: callsite: 0x1804
+# CHECK-NEXT: calleeTypeId: 0x308e4b8159bc8654
+# CHECK-NEXT: }
+# CHECK-NEXT: Direct callee count:: 3
+# CHECK-NEXT: {
+# CHECK-NEXT: Callee:: foo
+# CHECK-NEXT: CalleePC:: 0x1790
+# CHECK-NEXT: Callee:: bar
+# CHECK-NEXT: CalleePC:: 0x17a0
+# CHECK-NEXT: Callee:: baz
+# CHECK-NEXT: CalleePC:: 0x17b0
----------------
Prabhuk wrote:
Ack. One of the offline feedback I received is to turn GNU output into a tabular format to match existing readelf output style. I will work on that and update the patch.
https://github.com/llvm/llvm-project/pull/157499
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