https://bugs.llvm.org/show_bug.cgi?id=41206
Bug ID: 41206
Summary: Infinite loop in ARC destructor for C struct
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: smee...@fb.com
CC: ahata...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk,
rjmcc...@apple.com
$ cat /tmp/reduced.m
@class I;
typedef struct {
I *name;
} Foo;
typedef struct {
Foo foo;
} Bar;
I *getI();
void f() {
Foo foo = {getI()};
Bar bar = {foo};
}
$ clang -cc1 -triple x86_64-apple-ios12.1.0 -fobjc-arc -emit-llvm -o -
/tmp/reduced.m
...
define linkonce_odr hidden void @__destructor_8_s0(i8** %dst) #3 {
entry:
%dst.addr = alloca i8**, align 8
store i8** %dst, i8*** %dst.addr, align 8
%0 = load i8**, i8*** %dst.addr, align 8
call void @__destructor_8_s0(i8** %0) #2
ret void
}
...
__destructor_8_s0 has an unconditional call to itself, resulting in an infinite
loop.
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