Recover instead of crashing on MS assembly when no target is loaded

It's possible to embed the frontend in applications that haven't initialized
backend targets so we need to handle this condition gracefully.

llvm-svn: 193685

1 files changed, 7 insertions, 6 deletions

diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index caf0011dba9..2ff83cb5b46 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -2104,9 +2104,15 @@ StmtResult Parser::ParseMicrosoftAsmStatement(SourceLocation AsmLoc) {
   if (UnsupportedArch)
     Diag(AsmLoc, diag::err_msasm_unsupported_arch) << TheTriple.getArchName();
     
+  std::string Error;
+  const std::string &TT = TheTriple.getTriple();
+  const llvm::Target *TheTarget = llvm::TargetRegistry::lookupTarget(TT, Error);
+  if (!TheTarget)
+    Diag(AsmLoc, diag::err_msasm_unable_to_create_target) << Error;
+
   // If we don't support assembly, or the assembly is empty, we don't
   // need to instantiate the AsmParser, etc.
-  if (UnsupportedArch || AsmToks.empty()) {
+  if (UnsupportedArch || !TheTarget || AsmToks.empty()) {
     return Actions.ActOnMSAsmStmt(AsmLoc, LBraceLoc, AsmToks, StringRef(),
                                   /*NumOutputs*/ 0, /*NumInputs*/ 0,
                                   ConstraintRefs, ClobberRefs, Exprs, EndLoc);
@@ -2118,11 +2124,6 @@ StmtResult Parser::ParseMicrosoftAsmStatement(SourceLocation AsmLoc) {
   if (buildMSAsmString(PP, AsmLoc, AsmToks, TokOffsets, AsmString))
     return StmtError();
 
-  // Find the target and create the target specific parser.
-  std::string Error;
-  const std::string &TT = TheTriple.getTriple();
-  const llvm::Target *TheTarget = llvm::TargetRegistry::lookupTarget(TT, Error);
-
   OwningPtr<llvm::MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TT));
   OwningPtr<llvm::MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TT));
   // Get the instruction descriptor.