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If a struct/enum type used in a record doesn't have a forward decl / def, an implicit one is injected into the struct. This stops clang from randomizing the structure in some situations---i.e. when the struct contains only function pointers. So we accept forward decls so they don't prevent randomization. Fixes 60349 Reviewed By: MaskRay, nickdesaulniers Differential Revision: https://reviews.llvm.org/D143300
37 lines
1008 B
C
37 lines
1008 B
C
// RUN: %clang_cc1 -triple=x86_64-unknown-linux -emit-llvm -frandomize-layout-seed=1234567890abcdef < %s | FileCheck %s
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// PR60349
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// Clang will add a forward declaration of "struct bar" and "enum qux" to the
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// structures. This shouldn't prevent these structures from being randomized.
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// So the 'f' element shouldn't be at the start of the structure anymore.
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struct foo {
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struct bar *(*f)(void);
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struct bar *(*g)(void);
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struct bar *(*h)(void);
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struct bar *(*i)(void);
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struct bar *(*j)(void);
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struct bar *(*k)(void);
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};
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// CHECK-LABEL: define {{.*}}@t1(
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// CHECK-NOT: getelementptr inbounds %struct.foo, ptr %3, i32 0, i32 0
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struct bar *t1(struct foo *z) {
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return z->f();
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}
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struct baz {
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enum qux *(*f)(void);
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enum qux *(*g)(void);
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enum qux *(*h)(void);
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enum qux *(*i)(void);
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enum qux *(*j)(void);
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enum qux *(*k)(void);
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};
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// CHECK-LABEL: define {{.*}}@t2(
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// CHECK-NOT: getelementptr inbounds %struct.baz, ptr %3, i32 0, i32 0
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enum qux *t2(struct baz *z) {
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return z->f();
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}
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