a2347baaec
Because references must be initialized using some evaluated expression, they must point to something, and a callee can assume the reference parameter is dereferenceable. Taking advantage of a new attribute just added to LLVM, mark them as such. Because dereferenceability in addrspace(0) implies nonnull in the backend, we don't need both attributes. However, we need to know the size of the object to use the dereferenceable attribute, so for incomplete types we still emit only nonnull. llvm-svn: 213386
43 lines
954 B
C++
43 lines
954 B
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm %s -o - | \
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// RUN: FileCheck %s
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// RUN: %clang_cc1 -triple i386-apple-darwin -std=c++11 -emit-llvm %s -o - | \
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// RUN: FileCheck %s
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extern "C" int printf(...);
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int f1(int arg) { return arg; };
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int f2(float arg) { return int(arg); };
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typedef int (*fp1)(int);
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typedef int (*fp2)(float);
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struct A {
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operator fp1() { return f1; }
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operator fp2() { return f2; }
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} a;
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// Test for function reference.
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typedef int (&fr1)(int);
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typedef int (&fr2)(float);
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struct B {
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operator fr1() { return f1; }
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operator fr2() { return f2; }
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} b;
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int main()
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{
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int i = a(10); // Calls f1 via pointer returned from conversion function
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printf("i = %d\n", i);
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int j = b(20); // Calls f1 via pointer returned from conversion function
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printf("j = %d\n", j);
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return 0;
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}
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// CHECK: call i32 (i32)* (%struct.A*)* @_ZN1AcvPFiiEEv
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// CHECK: call i32 (i32)* (%struct.B*)* @_ZN1BcvRFiiEEv
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