forked from OSchip/llvm-project
166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm %s -o - -verify | FileCheck %s
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// CHECK: @weakvar = weak global
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// CHECK: @__weakvar_alias = common global
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// CHECK: @correct_linkage = weak global
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// CHECK: @both = alias void ()* @__both
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// CHECK: @both2 = alias void ()* @__both2
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// CHECK: @both3 = alias weak void ()* @__both3
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// CHECK: @a3 = alias weak void ()* @__a3
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// CHECK: @weakvar_alias = alias weak i32* @__weakvar_alias
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// CHECK: @foo = alias weak void ()* @__foo
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// CHECK: @foo2 = alias weak void ()* @__foo2
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// CHECK: @stutter = alias weak void ()* @__stutter
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// CHECK: @stutter2 = alias weak void ()* @__stutter2
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// CHECK: @declfirst = alias weak void ()* @__declfirst
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// CHECK: @declfirstattr = alias weak void ()* @__declfirstattr
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// CHECK: @mix2 = alias weak void ()* @__mix2
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// CHECK: @a1 = alias weak void ()* @__a1
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// CHECK: @xxx = alias weak void ()* @__xxx
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// CHECK: define weak void @weakdef()
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#pragma weak weakvar
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int weakvar;
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#pragma weak weakdef
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void weakdef(void) {}
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#pragma weak param // expected-warning {{weak identifier 'param' never declared}}
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#pragma weak correct_linkage
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void f(int param) {
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int correct_linkage;
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}
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#pragma weak weakvar_alias = __weakvar_alias
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int __weakvar_alias;
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#pragma weak foo = __foo
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void __foo(void) {}
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// CHECK: define void @__foo()
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void __foo2(void) {}
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#pragma weak foo2 = __foo2
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// CHECK: define void @__foo2()
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///// test errors
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#pragma weak unused // expected-warning {{weak identifier 'unused' never declared}}
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#pragma weak unused_alias = __unused_alias // expected-warning {{weak identifier '__unused_alias' never declared}}
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#pragma weak td // expected-warning {{weak identifier 'td' never declared}}
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typedef int td;
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#pragma weak td2 = __td2 // expected-warning {{weak identifier '__td2' never declared}}
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typedef int __td2;
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///// test weird cases
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// test repeats
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#pragma weak stutter = __stutter
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#pragma weak stutter = __stutter
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void __stutter(void) {}
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// CHECK: define void @__stutter()
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void __stutter2(void) {}
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#pragma weak stutter2 = __stutter2
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#pragma weak stutter2 = __stutter2
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// CHECK: define void @__stutter2()
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// test decl/pragma weak order
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void __declfirst(void);
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#pragma weak declfirst = __declfirst
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void __declfirst(void) {}
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// CHECK: define void @__declfirst()
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void __declfirstattr(void) __attribute((noinline));
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#pragma weak declfirstattr = __declfirstattr
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void __declfirstattr(void) {}
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// CHECK: define void @__declfirstattr()
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//// test that other attributes are preserved
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//// ensure that pragma weak/__attribute((weak)) play nice
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void mix(void);
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#pragma weak mix
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__attribute((weak)) void mix(void) { }
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// CHECK: define weak void @mix()
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// ensure following __attributes are preserved and that only a single
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// alias is generated
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#pragma weak mix2 = __mix2
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void __mix2(void) __attribute((noinline));
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void __mix2(void) __attribute((noinline));
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void __mix2(void) {}
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// CHECK: define void @__mix2()
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////////////// test #pragma weak/__attribute combinations
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// if the SAME ALIAS is already declared then it overrides #pragma weak
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// resulting in a non-weak alias in this case
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void both(void) __attribute((alias("__both")));
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#pragma weak both = __both
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void __both(void) {}
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// CHECK: define void @__both()
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// if the TARGET is previously declared then whichever aliasing method
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// comes first applies and subsequent aliases are discarded.
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// TODO: warn about this
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void __both2(void);
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void both2(void) __attribute((alias("__both2"))); // first, wins
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#pragma weak both2 = __both2
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void __both2(void) {}
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// CHECK: define void @__both2()
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void __both3(void);
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#pragma weak both3 = __both3 // first, wins
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void both3(void) __attribute((alias("__both3")));
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void __both3(void) {}
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// CHECK: define void @__both3()
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///////////// ensure that #pragma weak does not alter existing __attributes()
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void __a1(void) __attribute((noinline));
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#pragma weak a1 = __a1
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void __a1(void) {}
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// CHECK: define void @__a1()
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// attributes introduced BEFORE a combination of #pragma weak and alias()
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// hold...
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void __a3(void) __attribute((noinline));
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#pragma weak a3 = __a3
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void a3(void) __attribute((alias("__a3")));
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void __a3(void) {}
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// CHECK: define void @__a3()
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#pragma weak xxx = __xxx
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__attribute((pure,noinline,const,fastcall)) void __xxx(void) { }
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// CHECK: void @__xxx()
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/// TODO: stuff that still doesn't work
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// due to the fact that disparate TopLevelDecls cannot affect each other
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// (due to clang's Parser and ASTConsumer behavior, and quite reasonable)
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// #pragma weak must appear before or within the same TopLevelDecl as it
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// references.
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void yyy(void){}
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void zzz(void){}
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#pragma weak yyy
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// NOTE: weak doesn't apply, not before or in same TopLevelDec(!)
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// CHECK: define void @yyy()
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int correct_linkage;
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