[llvm] [llvm-readobj] Dump callgraph section info for ELF (PR #157499)
Paul Kirth via llvm-commits
llvm-commits at lists.llvm.org
Fri Oct 31 16:15:20 PDT 2025
================
@@ -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;
+# }
+
+# CHECK: Call graph section '.llvm.callgraph' contains 4 entries:
+# CHECK-EMPTY:
+# CHECK-NEXT: Entry 0:
+# CHECK-NEXT: Address: 0x1790 <foo>
+# CHECK-NEXT: Indirect Target: Yes
+# CHECK-NEXT: Type ID: 0x3ecbeef531f74424
+# CHECK-NEXT: Direct Callees (0):
+# CHECK-NEXT: Indirect Callees by Type ID (0):
+# CHECK-EMPTY:
+# CHECK-NEXT: Entry 1:
+# CHECK-NEXT: Address: 0x17a0 <bar>
+# CHECK-NEXT: Indirect Target: Yes
+# CHECK-NEXT: Type ID: 0x3ecbeef531f74424
+# CHECK-NEXT: Direct Callees (0):
+# CHECK-NEXT: Indirect Callees by Type ID (0):
+# CHECK-EMPTY:
+# CHECK-NEXT: Entry 2:
+# CHECK-NEXT: Address: 0x17b0 <baz>
+# CHECK-NEXT: Indirect Target: Yes
+# CHECK-NEXT: Type ID: 0x308e4b8159bc8654
+# CHECK-NEXT: Direct Callees (0):
+# CHECK-NEXT: Indirect Callees by Type ID (0):
+# CHECK-EMPTY:
+# CHECK-NEXT: Entry 3:
+# CHECK-NEXT: Address: 0x17c0 <main>
+# CHECK-NEXT: Indirect Target: Yes
+# CHECK-NEXT: Type ID: 0xfa6809609a76afca
+# CHECK-NEXT: Direct Callees (3):
+# CHECK-NEXT: Address: 0x1790 <foo>
+# CHECK-NEXT: Address: 0x17a0 <bar>
+# CHECK-NEXT: Address: 0x17b0 <baz>
+# CHECK-NEXT: Indirect Callees by Type ID (2):
+# CHECK-NEXT: 0x3ecbeef531f74424
+# CHECK-NEXT: 0x308e4b8159bc8654
+
+# LLVM: callgraph_info [
+# LLVM-NEXT: Function {
+# LLVM-NEXT: Functions: [foo]
+# LLVM-NEXT: Address: 0x1790
+# LLVM-NEXT: Version: 0
+# LLVM-NEXT: IsIndirectTarget: Yes
+# LLVM-NEXT: TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT: NumDirectCallees: 0
+# LLVM-NEXT: DirectCallees [
+# LLVM-NEXT: ]
+# LLVM-NEXT: NumIndirectTargetTypeIDs: 0
+# LLVM-NEXT: IndirectTypeIDs [
+# LLVM-NEXT: ]
+# LLVM-NEXT: }
+# LLVM-NEXT: Function {
+# LLVM-NEXT: Functions: [bar]
+# LLVM-NEXT: Address: 0x17A0
+# LLVM-NEXT: Version: 0
+# LLVM-NEXT: IsIndirectTarget: Yes
+# LLVM-NEXT: TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT: NumDirectCallees: 0
+# LLVM-NEXT: DirectCallees [
+# LLVM-NEXT: ]
+# LLVM-NEXT: NumIndirectTargetTypeIDs: 0
+# LLVM-NEXT: IndirectTypeIDs [
+# LLVM-NEXT: ]
+# LLVM-NEXT: }
+# LLVM-NEXT: Function {
+# LLVM-NEXT: Functions: [baz]
+# LLVM-NEXT: Address: 0x17B0
+# LLVM-NEXT: Version: 0
+# LLVM-NEXT: IsIndirectTarget: Yes
+# LLVM-NEXT: TypeId: 0x308E4B8159BC8654
+# LLVM-NEXT: NumDirectCallees: 0
+# LLVM-NEXT: DirectCallees [
+# LLVM-NEXT: ]
+# LLVM-NEXT: NumIndirectTargetTypeIDs: 0
+# LLVM-NEXT: IndirectTypeIDs [
+# LLVM-NEXT: ]
+# LLVM-NEXT: }
+# LLVM-NEXT: Function {
+# LLVM-NEXT: Functions: [main]
+# LLVM-NEXT: Address: 0x17C0
+# LLVM-NEXT: Version: 0
+# LLVM-NEXT: IsIndirectTarget: Yes
+# LLVM-NEXT: TypeId: 0xFA6809609A76AFCA
+# LLVM-NEXT: NumDirectCallees: 3
+# LLVM-NEXT: DirectCallees [
+# LLVM-NEXT: Entry {
+# LLVM-NEXT: Functions: [foo]
+# LLVM-NEXT: Address: 0x1790
+# LLVM-NEXT: }
+# LLVM-NEXT: Entry {
+# LLVM-NEXT: Functions: [bar]
+# LLVM-NEXT: Address: 0x17A0
+# LLVM-NEXT: }
+# LLVM-NEXT: Entry {
+# LLVM-NEXT: Functions: [baz]
+# LLVM-NEXT: Address: 0x17B0
+# LLVM-NEXT: }
+# LLVM-NEXT: ]
+# LLVM-NEXT: NumIndirectTargetTypeIDs: 2
+# LLVM-NEXT: IndirectTypeIDs [
+# LLVM-NEXT: Entry {
+# LLVM-NEXT: TypeId: 0x3ECBEEF531F74424
+# LLVM-NEXT: }
+# LLVM-NEXT: Entry {
+# LLVM-NEXT: TypeId: 0x308E4B8159BC8654
+# LLVM-NEXT: }
+# LLVM-NEXT: ]
+# LLVM-NEXT: }
+# LLVM-NEXT: ]
+
+
+# JSON: "callgraph_info": [
+# JSON-NEXT: {
+# JSON-NEXT: "Function": {
+# JSON-NEXT: "Functions": [
+# JSON-NEXT: "foo"
+# JSON-NEXT: ],
+# JSON-NEXT: "Address": 6032,
+# JSON-NEXT: "Version": 0,
+# JSON-NEXT: "IsIndirectTarget": true,
+# JSON-NEXT: "TypeId": 4524972987496481828,
+# JSON-NEXT: "NumDirectCallees": 0,
+# JSON-NEXT: "DirectCallees": [],
+# JSON-NEXT: "NumIndirectTargetTypeIDs": 0,
+# JSON-NEXT: "IndirectTypeIDs": []
+# JSON-NEXT: }
+# JSON-NEXT: },
+# JSON-NEXT: {
+# JSON-NEXT: "Function": {
+# JSON-NEXT: "Functions": [
+# JSON-NEXT: "bar"
+# JSON-NEXT: ],
+# JSON-NEXT: "Address": 6048,
+# JSON-NEXT: "Version": 0,
+# JSON-NEXT: "IsIndirectTarget": true,
+# JSON-NEXT: "TypeId": 4524972987496481828,
+# JSON-NEXT: "NumDirectCallees": 0,
+# JSON-NEXT: "DirectCallees": [],
+# JSON-NEXT: "NumIndirectTargetTypeIDs": 0,
+# JSON-NEXT: "IndirectTypeIDs": []
+# JSON-NEXT: }
+# JSON-NEXT: },
+# JSON-NEXT: {
+# JSON-NEXT: "Function": {
+# JSON-NEXT: "Functions": [
+# JSON-NEXT: "baz"
+# JSON-NEXT: ],
+# JSON-NEXT: "Address": 6064,
+# JSON-NEXT: "Version": 0,
+# JSON-NEXT: "IsIndirectTarget": true,
+# JSON-NEXT: "TypeId": 3498816979441845844,
+# JSON-NEXT: "NumDirectCallees": 0,
+# JSON-NEXT: "DirectCallees": [],
+# JSON-NEXT: "NumIndirectTargetTypeIDs": 0,
+# JSON-NEXT: "IndirectTypeIDs": []
+# JSON-NEXT: }
+# JSON-NEXT: },
+# JSON-NEXT: {
+# JSON-NEXT: "Function": {
+# JSON-NEXT: "Functions": [
+# JSON-NEXT: "main"
+# JSON-NEXT: ],
+# JSON-NEXT: "Address": 6080,
+# JSON-NEXT: "Version": 0,
+# JSON-NEXT: "IsIndirectTarget": true,
+# JSON-NEXT: "TypeId": 18043682217572872138,
+# JSON-NEXT: "NumDirectCallees": 3,
+# JSON-NEXT: "DirectCallees": [
+# JSON-NEXT: {
+# JSON-NEXT: "Entry": {
+# JSON-NEXT: "Functions": [
+# JSON-NEXT: "foo"
+# JSON-NEXT: ],
+# JSON-NEXT: "Address": 6032
+# JSON-NEXT: }
+# JSON-NEXT: },
----------------
ilovepi wrote:
i understand that all the elements in the list are "entries", but I don't think the label helps.
This seems to be a more direct way to encode the same info w/o sacrificing the ability to parse the data in a straightforward manner.
```suggestion
# JSON-NEXT: {
# JSON-NEXT: "Name": "foo",
# JSON-NEXT: "Address": 6032
# JSON-NEXT: },
```
https://github.com/llvm/llvm-project/pull/157499
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