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Refine string literal concatenation warning within an NSArray literal to not warn when the literal comes from a macro expansion. Fixes <rdar://problem/15147688>. 

llvm-svn: 192328
This commit is contained in:
Ted Kremenek 2013-10-09 22:34:33 +00:00
parent 931a0def9e
commit 197fee407e
2 changed files with 26 additions and 4 deletions
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22
clang/lib/Sema/SemaExprObjC.cpp
View File

@ -410,10 +410,24 @@ static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
}
}
if (ArrayLiteral)
if (ObjCStringLiteral *getString = dyn_cast<ObjCStringLiteral>(OrigElement)) {
if (getString->getString() && getString->getString()->getNumConcatenated() > 1)
S.Diag(Element->getLocStart(), diag::warn_concatenated_nsarray_literal)
<< Element->getType();
if (ObjCStringLiteral *getString =
dyn_cast<ObjCStringLiteral>(OrigElement)) {
if (StringLiteral *SL = getString->getString()) {
unsigned numConcat = SL->getNumConcatenated();
if (numConcat > 1) {
// Only warn if the concatenated string doesn't come from a macro.
bool hasMacro = false;
for (unsigned i = 0; i < numConcat ; ++i)
if (SL->getStrTokenLoc(i).isMacroID()) {
hasMacro = true;
break;
}
if (!hasMacro)
S.Diag(Element->getLocStart(),
diag::warn_concatenated_nsarray_literal)
<< Element->getType();
}
}
}
// Make sure that the element has the type that the container factory

8
clang/test/SemaObjC/objc-array-literal.m
View File

@ -45,3 +45,11 @@ id Test14303083() {
id obj = @[ @"A", (@"B" @"C")];
return @[ @"A", @"B" @"C"]; // expected-warning {{concatenated NSString literal for an NSArray expression - possibly missing a comma}}
}
id radar15147688() {
#define R15147688_A @"hello"
#define R15147688_B "world"
#define CONCATSTR R15147688_A R15147688_B
id x = @[ @"stuff", CONCATSTR ]; // no-warning
x = @[ @"stuff", @"hello" "world"]; // expected-warning {{concatenated NSString literal for an NSArray expression}}
return x;
}