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Skip checking for infinite for-loops if there are global or static variables 

in the conditional.

llvm-svn: 156148
This commit is contained in:
Richard Trieu 2012-05-04 03:01:54 +00:00
parent 75fbe90839
commit 0030f1dbc1
2 changed files with 11 additions and 2 deletions
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5
clang/lib/Sema/SemaStmt.cpp
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@ -1214,11 +1214,12 @@ public:
// No decls found.
if (Decls.size() == 0) return;
// Don't warn on volatile decls.
// Don't warn on volatile, static, or global variables.
for (llvm::SmallPtrSet<VarDecl*, 8>::iterator I = Decls.begin(),
E = Decls.end();
I != E; ++I)
if ((*I)->getType().isVolatileQualified()) return;
if ((*I)->getType().isVolatileQualified() ||
(*I)->hasGlobalStorage()) return;
if (DeclMatcher(S, Decls, Second).FoundDeclInUse() ||
DeclMatcher(S, Decls, Third).FoundDeclInUse() ||

8
clang/test/SemaCXX/warn-loop-analysis.cpp
View File

@ -144,3 +144,11 @@ void test5() {
for (int a; a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a+a;);//\
// expected-warning {{variable 'a' used in loop condition not modified in loop body}}
}
// Ignore global variables and static variables.
int x6;
void test6() {
static int y;
for (;x6;);
for (;y;);
}