From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 18 Dec 2012 00:52:36 +0000 (+0000)
Subject: More conservative fix for <rdar://problem/12847524> (a crash printing diagnostic... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=adff43ad96defb28bad20d8335ab30beadd72ee8;p=clang

More conservative fix for <rdar://problem/12847524> (a crash printing diagnostic ranges).
I'm not really happy with this fix, but I'm confident it's correct.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170397 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/DiagnosticRenderer.cpp b/lib/Frontend/DiagnosticRenderer.cpp
index 89d3867aad..88a8706731 100644
--- a/lib/Frontend/DiagnosticRenderer.cpp
+++ b/lib/Frontend/DiagnosticRenderer.cpp
@@ -363,6 +363,13 @@ static void mapDiagnosticRanges(
         End = SM->getImmediateExpansionRange(End).second;
       }
       BeginFileID = SM->getFileID(Begin);
+      if (BeginFileID != SM->getFileID(End)) {
+        // FIXME: Ugly hack to stop a crash; this code is making bad
+        // assumptions and it's too complicated for me to reason
+        // about.
+        Begin = End = SourceLocation();
+        break;
+      }
     }
 
     // Return the spelling location of the beginning and end of the range.
diff --git a/test/Misc/caret-diags-macros.c b/test/Misc/caret-diags-macros.c
index ce62425e78..95fc64cf3c 100644
--- a/test/Misc/caret-diags-macros.c
+++ b/test/Misc/caret-diags-macros.c
@@ -205,3 +205,23 @@ void foo_aa()
 // CHECK-NEXT:    {{.*}}:189:31: note: expanded from macro 'APPEND2'
 // CHECK-NEXT:    #define APPEND2(NUM, SUFF) -1 != NUM ## SUFF
 // CHECK-NEXT: {{^                           ~~ \^  ~~~~~~~~~~~}}
+
+unsigned long strlen_test(const char *s);
+#define __darwin_obsz(object) __builtin_object_size (object, 1)
+#define sprintf2(str, ...) \
+  __builtin___sprintf_chk (str, 0, __darwin_obsz(str), __VA_ARGS__)
+#define Cstrlen(a)  strlen_test(a)
+#define Csprintf    sprintf2
+void f(char* pMsgBuf, char* pKeepBuf) {
+Csprintf(pMsgBuf,"\nEnter minimum anagram length (2-%1d): ", Cstrlen(pKeepBuf));
+}
+// CHECK:         {{.*}}:216:62: warning: format specifies type 'int' but the argument has type 'unsigned long'
+// CHECK-NEXT:    Csprintf(pMsgBuf,"\nEnter minimum anagram length (2-%1d): ", Cstrlen(pKeepBuf));
+// CHECK-NEXT: {{^                                                    ~~~      \^}}
+// CHECK-NEXT: {{^                                                    %1ld}}
+// CHECK-NEXT:    {{.*}}:213:21: note: expanded from macro 'Cstrlen'
+// CHECK-NEXT:    #define Cstrlen(a)  strlen_test(a)
+// CHECK-NEXT: {{^                    \^}}
+// CHECK-NEXT:    {{.*}}:212:56: note: expanded from macro 'sprintf2'
+// CHECK-NEXT:      __builtin___sprintf_chk (str, 0, __darwin_obsz(str), __VA_ARGS__)
+// CHECK-NEXT: {{^                                                       \^}}