Format strings: the correct conversion for 'char' is %c, not %d or %hhd.

We tried to account for 'uint8_t' by saying that /typedefs/ of 'char'
should be corrected as %hhd rather than %c, but the condition was wrong.

llvm-svn: 169397

2 files changed, 55 insertions, 1 deletions

diff --git a/clang/lib/Analysis/PrintfFormatString.cpp b/clang/lib/Analysis/PrintfFormatString.cpp
index 611815cd89e..08207910b83 100644
--- a/clang/lib/Analysis/PrintfFormatString.cpp
+++ b/clang/lib/Analysis/PrintfFormatString.cpp
@@ -506,7 +506,7 @@ bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
 
   // Set conversion specifier and disable any flags which do not apply to it.
   // Let typedefs to char fall through to int, as %c is silly for uint8_t.
-  if (isa<TypedefType>(QT) && QT->isAnyCharacterType()) {
+  if (!isa<TypedefType>(QT) && QT->isCharType()) {
     CS.setKind(ConversionSpecifier::cArg);
     LM.setKind(LengthModifier::None);
     Precision.setHowSpecified(OptionalAmount::NotSpecified);
diff --git a/clang/test/FixIt/format.m b/clang/test/FixIt/format.m
index c4747019b2d..4b13c2cf956 100644
--- a/clang/test/FixIt/format.m
+++ b/clang/test/FixIt/format.m
@@ -93,3 +93,57 @@ void test_named_fixed_enum_correction(enum SomeSize x) {
   // CHECK: fix-it:"{{.*}}":{92:11-92:13}:"%zu"
 }
 
+
+typedef unsigned char uint8_t;
+void test_char(char c, signed char s, unsigned char u, uint8_t n) {
+  NSLog(@"%s", c); // expected-warning{{format specifies type 'char *' but the argument has type 'char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%lf", c); // expected-warning{{format specifies type 'double' but the argument has type 'char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:14}:"%c"
+
+  NSLog(@"%@", c); // expected-warning{{format specifies type 'id' but the argument has type 'char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%c", c); // no-warning
+  // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  
+  NSLog(@"%s", s); // expected-warning{{format specifies type 'char *' but the argument has type 'signed char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%lf", s); // expected-warning{{format specifies type 'double' but the argument has type 'signed char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:14}:"%c"
+
+  NSLog(@"%@", s); // expected-warning{{format specifies type 'id' but the argument has type 'signed char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%c", s); // no-warning
+  // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+
+  NSLog(@"%s", u); // expected-warning{{format specifies type 'char *' but the argument has type 'unsigned char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%lf", u); // expected-warning{{format specifies type 'double' but the argument has type 'unsigned char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:14}:"%c"
+
+  NSLog(@"%@", u); // expected-warning{{format specifies type 'id' but the argument has type 'unsigned char'}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+  NSLog(@"%c", u); // no-warning
+  // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%c"
+
+
+  NSLog(@"%s", n); // expected-warning{{format specifies type 'char *' but the argument has type 'uint8_t' (aka 'unsigned char')}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%hhu"
+
+  NSLog(@"%lf", n); // expected-warning{{format specifies type 'double' but the argument has type 'uint8_t' (aka 'unsigned char')}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:14}:"%hhu"
+
+  NSLog(@"%@", n); // expected-warning{{format specifies type 'id' but the argument has type 'uint8_t' (aka 'unsigned char')}}
+  // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%hhu"
+
+  NSLog(@"%c", n); // no-warning
+  // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:13}:"%hhu"
+}