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

[Paul Kirth via llvm-commits]

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@@ -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
+# CHECK-NEXT: }
+
+
+# LLVM: callgraph_info [
+# LLVM-NEXT:   Function {
+# LLVM-NEXT:     Name: foo
+# LLVM-NEXT:     Address: 0x1790
+# LLVM-NEXT:     Version: 0
+# LLVM-NEXT:     KindStr: KNOWN_TID
+# LLVM-NEXT:     Kind: 2
+# LLVM-NEXT:     TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT:     NumIndirectCallSites: 0
+# LLVM-NEXT:     NumDirectCallSites: 0
+# LLVM-NEXT:   }
+# LLVM-NEXT:   Function {
+# LLVM-NEXT:     Name: bar
+# LLVM-NEXT:     Address: 0x17A0
+# LLVM-NEXT:     Version: 0
+# LLVM-NEXT:     KindStr: KNOWN_TID
+# LLVM-NEXT:     Kind: 2
+# LLVM-NEXT:     TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT:     NumIndirectCallSites: 0
+# LLVM-NEXT:     NumDirectCallSites: 0
+# LLVM-NEXT:   }
+# LLVM-NEXT:   Function {
+# LLVM-NEXT:     Name: baz
+# LLVM-NEXT:     Address: 0x17B0
+# LLVM-NEXT:     Version: 0
+# LLVM-NEXT:     KindStr: KNOWN_TID
+# LLVM-NEXT:     Kind: 2
+# LLVM-NEXT:     TypeId: 0x308E4B8159BC8654
+# LLVM-NEXT:     NumIndirectCallSites: 0
+# LLVM-NEXT:     NumDirectCallSites: 0
+# LLVM-NEXT:   }
+# LLVM-NEXT:   Function {
+# LLVM-NEXT:     Name: main
+# LLVM-NEXT:     Address: 0x17C0
+# LLVM-NEXT:     Version: 0
+# LLVM-NEXT:     KindStr: KNOWN_TID
+# LLVM-NEXT:     Kind: 2
+# LLVM-NEXT:     TypeId: 0xFA6809609A76AFCA
+# LLVM-NEXT:     NumIndirectCallSites: 3
+# LLVM-NEXT:     IndirectCallsites [
+# LLVM-NEXT:       IndirectCallsite {
+# LLVM-NEXT:         Address: 0x17EF
+# LLVM-NEXT:         TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT:       }
+# LLVM-NEXT:       IndirectCallsite {
+# LLVM-NEXT:         Address: 0x17DF
+# LLVM-NEXT:         TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT:       }
+# LLVM-NEXT:       IndirectCallsite {
+# LLVM-NEXT:         Address: 0x1804
+# LLVM-NEXT:         TypeId: 0x308E4B8159BC8654
+# LLVM-NEXT:       }
+# LLVM-NEXT:     ]
+# LLVM-NEXT:     NumDirectCallSites: 3
+# LLVM-NEXT:     DirectCallees [
+# LLVM-NEXT:       Entry {
+# LLVM-NEXT:         Name: foo
+# LLVM-NEXT:         Address: 0x1790
+# LLVM-NEXT:       }
+# LLVM-NEXT:       Entry {
+# LLVM-NEXT:         Name: bar
+# LLVM-NEXT:         Address: 0x17A0
+# LLVM-NEXT:       }
+# LLVM-NEXT:       Entry {
+# LLVM-NEXT:         Name: baz
+# LLVM-NEXT:         Address: 0x17B0
+# LLVM-NEXT:       }
+# LLVM-NEXT:     ]
+# LLVM-NEXT:   }
+# LLVM-NEXT: ]
+
+
+# JSON:     "callgraph_info": [
+# JSON-NEXT:       {
+# JSON-NEXT:         "Function": {
+# JSON-NEXT:           "Name": "foo",
+# JSON-NEXT:           "Address": 6032,
+# JSON-NEXT:           "Version": 0,
----------------
ilovepi wrote:

What is the version number?

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