commit d68c7aa7e633e6bd191d3964eb5a941f8d66f152
author Duncan P. N. Exon Smith <dexonsmith@apple.com> Mon Dec 16 03:20:06 2013 +0000
committer Duncan P. N. Exon Smith <dexonsmith@apple.com> Mon Dec 16 03:20:06 2013 +0000
tree 0ce9bb8daa1e43485aad1495179f76c200a5cc96
parent 774cabb5386f9d680a28d83ee478c79673bef145

Stop crashing on empty asm input constraints

An empty string for an ASM input constraint is invalid, and will crash
during clang CodeGen.  Change TargetInfo::validateInputConstraint to
reject an empty string.

<rdar://problem/15552191>

llvm-svn: 197362

clang/lib/Basic/TargetInfo.cpp

diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 5aa84af..d0ed6e6b 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -482,6 +482,9 @@
                                          ConstraintInfo &Info) const {
   const char *Name = Info.ConstraintStr.c_str();
 
+  if (!*Name)
+    return false;
+
   while (*Name) {
     switch (*Name) {
     default: