[PATCH] D38159: [clang] Fix printf fixit for objc specific types

[Alexander Shaposhnikov via Phabricator via cfe-commits]

alexshap created this revision.

Let's take a look at the following example: 
for the triple thumbv7-apple-ios8.0.0 ssize_t is long and size_t is unsigned long,
while NSInteger is int and NSUinteger is unsigned int.
Following https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html
Clang will catch it and insert a cast to long, for example
 printf("%zd", getNSInteger())
will be replaced with 
 printf("%zd", (long)getNSInteger())
but since the underlying type of ssize_t is long the specifier "%zd" is not getting replaced.
This diff changes this behavior to enabling replacing the specifier "%zd" with the correct one.

Test plan: make check-all


Repository:
  rL LLVM

https://reviews.llvm.org/D38159

Files:
  lib/Sema/SemaChecking.cpp
  test/FixIt/fixit-format-ios.m


Index: test/FixIt/fixit-format-ios.m
===================================================================
--- test/FixIt/fixit-format-ios.m
+++ test/FixIt/fixit-format-ios.m
@@ -0,0 +1,27 @@
+// RUN: cp %s %t
+// RUN: %clang_cc1 -triple thumbv7-apple-ios8.0.0 -fsyntax-only -fblocks -Wformat -fixit %t
+// RUN: grep -v CHECK %t | FileCheck %s
+
+int printf(const char * restrict, ...);
+typedef unsigned int NSUInteger;
+typedef int NSInteger;
+NSUInteger getNSUInteger();
+NSInteger getNSInteger();
+
+void test() {
+  // For thumbv7-apple-ios8.0.0 
+  // the underlying type of size_t is unsigned long 
+  // and for ssize_t it is long.
+
+  printf("test 1: %zu", getNSUInteger()); 
+  // CHECK: printf("test 1: %lu", (unsigned long)getNSUInteger());
+
+  printf("test 2: %zu %zu", getNSUInteger(), getNSUInteger());
+  // CHECK: printf("test 2: %lu %lu", (unsigned long)getNSUInteger(), (unsigned long)getNSUInteger());
+
+  printf("test 3: %zd", getNSInteger()); 
+  // CHECK: printf("test 3: %ld", (long)getNSInteger());
+
+  printf("test 4: %zd %zd", getNSInteger(), getNSInteger());
+  // CHECK: printf("test 4: %ld %ld", (long)getNSInteger(), (long)getNSInteger());
+}
Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp
+++ lib/Sema/SemaChecking.cpp
@@ -6346,7 +6346,7 @@
       CastFix << ")";
 
       SmallVector<FixItHint,4> Hints;
-      if (!AT.matchesType(S.Context, IntendedTy))
+      if (!AT.matchesType(S.Context, IntendedTy) || ShouldNotPrintDirectly) 
         Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));
 
       if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {


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