550b62cbcb
Create and add generalized type identifier metadata to indirect calls, and to functions which are potential indirect call targets. The functions carry the !type metadata. The indirect callsites carry a list of !type metadata values under !callee_type metadata. RFC: https://discourse.llvm.org/t/rfc-call-graph-information-from-clang-llvm-for-c-c/88255
31 lines
965 B
C++
31 lines
965 B
C++
// Tests that callback function whose address is taken is attached Type ID metadata
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// as it is a potential indirect call target.
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -fexperimental-call-graph-section \
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// RUN: -emit-llvm -o %t %s
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// RUN: FileCheck %s < %t
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////////////////////////////////////////////////////////////////////////////////
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typedef void (*CallbackFn)(int);
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// Callback function with "internal" linkage.
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// CHECK-LABEL: define internal void @_ZL10myCallbacki(
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// CHECK-SAME: {{.*}} !type [[F_CALLBACK:![0-9]+]]
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static void myCallback(int value)
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{
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volatile int sink = value;
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(void)sink;
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}
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int takeCallbackAddress() {
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// Take the address of the callback explicitly (address-taken function)
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CallbackFn cb = &myCallback;
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// Store the address in a volatile pointer to keep it observable
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volatile void* addr = (void*)cb;
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(void)addr;
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return 0;
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}
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// CHECK: [[F_CALLBACK]] = !{i64 0, !"_ZTSFviE.generalized"}
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