[llvm-branch-commits] [llvm] [llvm][AsmPrinter] Emit call graph section (PR #87576)

[Matt Arsenault via llvm-branch-commits]

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@@ -0,0 +1,50 @@
+;; Tests that we store the type identifiers in .callgraph section of the binary.
+
+; RUN: llc --call-graph-section -filetype=obj -o - < %s | \
+; RUN: llvm-readelf -x .callgraph - | FileCheck %s
+
+declare !type !4 void @foo() #0
+
+declare !type !5 noundef i32 @bar(i8 signext %a) #0
+
+declare !type !6 noundef ptr @baz(ptr %a) #0
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @main() #0 !type !7 {
+entry:
+  %retval = alloca i32, align 4
+  %fp_foo = alloca ptr, align 8
+  %a = alloca i8, align 1
+  %fp_bar = alloca ptr, align 8
+  %fp_baz = alloca ptr, align 8
+  store i32 0, ptr %retval, align 4
+  store ptr @foo, ptr %fp_foo, align 8
+  %0 = load ptr, ptr %fp_foo, align 8
+  call void (...) %0() [ "callee_type"(metadata !"_ZTSFvE.generalized") ]
+  store ptr @bar, ptr %fp_bar, align 8
+  %1 = load ptr, ptr %fp_bar, align 8
+  %2 = load i8, ptr %a, align 1
+  %call = call i32 %1(i8 signext %2) [ "callee_type"(metadata !"_ZTSFicE.generalized") ]
+  store ptr @baz, ptr %fp_baz, align 8
+  %3 = load ptr, ptr %fp_baz, align 8
+  %call1 = call ptr %3(ptr %a) [ "callee_type"(metadata !"_ZTSFPvS_E.generalized") ]
+  call void @foo() [ "callee_type"(metadata !"_ZTSFvE.generalized") ]
+  %4 = load i8, ptr %a, align 1
+  %call2 = call i32 @bar(i8 signext %4) [ "callee_type"(metadata !"_ZTSFicE.generalized") ]
+  %call3 = call ptr @baz(ptr %a) [ "callee_type"(metadata !"_ZTSFPvS_E.generalized") ]
+  ret void
+}
+
+;; Check that the numeric type id (md5 hash) for the below type ids are emitted
+;; to the callgraph section.
+
+; CHECK: Hex dump of section '.callgraph':
+
+; CHECK-DAG: 2444f731 f5eecb3e
+!4 = !{i64 0, !"_ZTSFvE.generalized"}
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arsenm wrote:

run through opt to renumber these 

https://github.com/llvm/llvm-project/pull/87576