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ObjC Module: try to make objc module deterministic.

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Make sure that comparing selectors in DeclarationName does its job.
rdar://problem/28988750

llvm-svn: 287244
This commit is contained in:
Manman Ren 2016-11-17 18:41:18 +00:00
parent 35a5fe9f07
commit b666573238
2 changed files with 30 additions and 2 deletions
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10
clang/lib/AST/DeclarationName.cpp
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@ -95,12 +95,18 @@ int DeclarationName::compare(DeclarationName LHS, DeclarationName RHS) {
case DeclarationName::ObjCMultiArgSelector: {
Selector LHSSelector = LHS.getObjCSelector();
Selector RHSSelector = RHS.getObjCSelector();
// getNumArgs for ZeroArgSelector returns 0, but we still need to compare.
if (LHS.getNameKind() == DeclarationName::ObjCZeroArgSelector &&
RHS.getNameKind() == DeclarationName::ObjCZeroArgSelector) {
return LHSSelector.getAsIdentifierInfo()->getName().compare(
RHSSelector.getAsIdentifierInfo()->getName());
}
unsigned LN = LHSSelector.getNumArgs(), RN = RHSSelector.getNumArgs();
for (unsigned I = 0, N = std::min(LN, RN); I != N; ++I) {
switch (LHSSelector.getNameForSlot(I).compare(
RHSSelector.getNameForSlot(I))) {
case -1: return true;
case 1: return false;
case -1: return -1;
case 1: return 1;
default: break;
}
}

22
clang/test/Modules/stress-objc.m Normal file
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@ -0,0 +1,22 @@
// RUN: cd %S
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00.pch -fno-pch-timestamp
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00_1.pch -fno-pch-timestamp
// RUN: diff %t_c00.pch %t_c00_1.pch
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00_2.pch -fno-pch-timestamp
// RUN: diff %t_c00.pch %t_c00_2.pch
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00_3.pch -fno-pch-timestamp
// RUN: diff %t_c00.pch %t_c00_3.pch
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00_4.pch -fno-pch-timestamp
// RUN: diff %t_c00.pch %t_c00_4.pch
// RUN: %clang_cc1 -emit-pch -x objective-c-header %s -o %t_c00_5.pch -fno-pch-timestamp
// RUN: diff %t_c00.pch %t_c00_5.pch
@protocol NSObject
- (void)doesNotRecognizeSelector:(SEL)aSelector;
- (id)forwardingTargetForSelector:(SEL)aSelector;
@end