derek.holloway
7502bf64a4
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78 lines
3.3 KiB
C++
78 lines
3.3 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fsanitize=cfi-icall -o - %s | FileCheck %s
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#define CFI_UNCHECKED_CALLEE __attribute__((cfi_unchecked_callee))
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void unchecked(void) CFI_UNCHECKED_CALLEE {}
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/// All references to unchecked function with `cfi_unchecked_callee` should have the `cfi_unchecked_callee` wrapper.
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// CHECK: @checked = global ptr no_cfi @_Z9uncheckedv
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void (*checked)(void) = unchecked;
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// CHECK: @unchecked2 = global ptr no_cfi @_Z9uncheckedv
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void (CFI_UNCHECKED_CALLEE *unchecked2)(void) = unchecked;
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// CHECK: @checked2 = global ptr no_cfi @_Z9uncheckedv
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constexpr void (CFI_UNCHECKED_CALLEE *unchecked_constexpr)(void) = unchecked;
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void (*checked2)(void) = unchecked_constexpr;
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/// Note we still reference the `no_cfi` function rather than the jump table entry.
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/// The explicit cast will only silence the warning.
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// CHECK: @checked_explicit_cast = global ptr no_cfi @_Z9uncheckedv
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void (*checked_explicit_cast)(void) = (void (*)(void))unchecked;
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// CHECK: @checked_array = global [3 x ptr] [ptr no_cfi @_Z9uncheckedv, ptr no_cfi @_Z9uncheckedv, ptr no_cfi @_Z9uncheckedv]
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void (*checked_array[])(void) = {
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unchecked,
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(void (*)(void))unchecked,
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reinterpret_cast<void (*)(void)>(unchecked),
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};
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void func_accepting_checked(void (*p)(void)) {}
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// CHECK-LABEL: _Z9InvokeCFIv
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void InvokeCFI() {
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// CHECK: %0 = load ptr, ptr @checked, align 8
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// CHECK: %1 = call i1 @llvm.type.test(ptr %0, metadata !"_ZTSFvvE")
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checked();
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}
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// CHECK-LABEL: _Z11InvokeNoCFIv
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void InvokeNoCFI() {
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// CHECK: %0 = load ptr, ptr @unchecked2, align 8
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// CHECK: call void %0()
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unchecked2();
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}
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struct A {
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void unchecked_method() CFI_UNCHECKED_CALLEE {}
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virtual void unchecked_virtual_method() CFI_UNCHECKED_CALLEE {}
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static void unchecked_static_method() CFI_UNCHECKED_CALLEE {}
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int unchecked_const_method() const CFI_UNCHECKED_CALLEE { return 0; }
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int unchecked_const_method_int_arg(int n) const CFI_UNCHECKED_CALLEE { return 0; }
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};
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void h(void) {
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// CHECK: store ptr no_cfi @_Z9uncheckedv, ptr %unchecked_local
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void (*unchecked_local)(void) = unchecked;
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// CHECK: call void @_Z22func_accepting_checkedPFvvE(ptr noundef no_cfi @_Z9uncheckedv)
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func_accepting_checked(unchecked);
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// CHECK: [[B:%.*]] = load ptr, ptr @checked
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// CHECK-NEXT: call void @_Z22func_accepting_checkedPFvvE(ptr noundef [[B]])
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func_accepting_checked(checked);
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// CHECK: store { i64, i64 } { i64 ptrtoint (ptr no_cfi @_ZN1A16unchecked_methodEv to i64), i64 0 }, ptr %A1
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auto A1 = &A::unchecked_method;
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/// Storing unchecked virtual function pointer stores an offset instead. This is part of the
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/// normal Itanium C++ ABI, but let's make sure we don't change anything.
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// CHECK: store { i64, i64 } { i64 1, i64 0 }, ptr %A2
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auto A2 = &A::unchecked_virtual_method;
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// CHECK: store ptr no_cfi @_ZN1A23unchecked_static_methodEv, ptr %A3
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auto A3 = &A::unchecked_static_method;
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// CHECK: store { i64, i64 } { i64 ptrtoint (ptr no_cfi @_ZNK1A22unchecked_const_methodEv to i64), i64 0 }, ptr %A4
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auto A4 = (int(CFI_UNCHECKED_CALLEE A::*)() const)(&A::unchecked_const_method);
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// CHECK: store { i64, i64 } { i64 ptrtoint (ptr no_cfi @_ZNK1A30unchecked_const_method_int_argEi to i64), i64 0 }, ptr %A5
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auto A5 = (int(CFI_UNCHECKED_CALLEE A::*)(int) const)(&A::unchecked_const_method_int_arg);
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}
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