64b0bdf88a
isTriviallyRecursive is a hack used to bridge a gap between the expectations that source code assumes and the semantics that LLVM IR can provide. Specifically, asm labels on functions are treated as an explicit name for a GlobalObject in Clang but treated like an output-processing step in GCC. Tweak this hack a little further to emit calls to library functions instead of emitting an incorrect definition. The definition in question would have available_externally linkage (this is OK) but result in a call to itself which will either result in an infinite loop or stack overflow. This fixes PR23964. llvm-svn: 241043
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm %s -o - | FileCheck %s
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extern void foo_alias (void) __asm ("foo");
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inline void foo (void) {
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return foo_alias ();
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}
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extern int abs_alias (int) __asm ("abs");
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inline __attribute__ ((__always_inline__)) int abs (int x) {
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return abs_alias(x);
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}
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extern char *strrchr_foo (const char *__s, int __c) __asm ("strrchr");
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extern inline __attribute__ ((__always_inline__)) __attribute__ ((__gnu_inline__)) char * strrchr_foo (const char *__s, int __c) {
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return __builtin_strrchr (__s, __c);
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}
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extern inline void __attribute__((always_inline, __gnu_inline__))
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prefetch(void) {
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__builtin_prefetch(0, 0, 1);
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}
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extern inline __attribute__((__always_inline__, __gnu_inline__)) void *memchr(void *__s, int __c, __SIZE_TYPE__ __n) {
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return __builtin_memchr(__s, __c, __n);
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}
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void f(void) {
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foo();
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abs(0);
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strrchr_foo("", '.');
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prefetch();
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memchr("", '.', 0);
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}
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// CHECK-LABEL: define void @f()
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// CHECK: call void @foo()
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// CHECK: call i32 @abs(i32 0)
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// CHECK: call i8* @strrchr(
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// CHECK: call void @llvm.prefetch(
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// CHECK: call i8* @memchr(
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// CHECK: ret void
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// CHECK: declare void @foo()
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// CHECK: declare i32 @abs(i32
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// CHECK: declare i8* @strrchr(i8*, i32)
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// CHECK: declare i8* @memchr(
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// CHECK: declare void @llvm.prefetch(
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