Now that the lowerinvoke pass inserts calls to llvm.setjmp/llvm.longjmp, some

hacks can be banished.  Also, this gives us the opportunity to emit special code
for the setjmp/longjmps which alows the elimination of one GCC warning for every
setjmp/longjmp site (which is often THOUSANDS in C++ programs).  Yaay!

llvm-svn: 11484

1 files changed, 15 insertions, 2 deletions

diff --git a/llvm/lib/Target/CBackend/Writer.cpp b/llvm/lib/Target/CBackend/Writer.cpp
index 0d36ea73c32..b52db0346a9 100644
--- a/llvm/lib/Target/CBackend/Writer.cpp
+++ b/llvm/lib/Target/CBackend/Writer.cpp
@@ -686,8 +686,7 @@ bool CWriter::doInitialization(Module &M) {
     Out << "\n/* Function Declarations */\n";
     for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
       // Don't print declarations for intrinsic functions.
-      if (!I->getIntrinsicID() &&
-          I->getName() != "setjmp" && I->getName() != "longjmp") {
+      if (!I->getIntrinsicID()) {
         printFunctionSignature(I, true);
         if (I->hasWeakLinkage()) Out << " __ATTRIBUTE_WEAK__";
         Out << ";\n";
@@ -1187,6 +1186,8 @@ void CWriter::lowerIntrinsics(Module &M) {
             case Intrinsic::va_end:
             case Intrinsic::returnaddress:
             case Intrinsic::frameaddress:
+            case Intrinsic::setjmp:
+            case Intrinsic::longjmp:
               // We directly implement these intrinsics
               break;
             default:
@@ -1245,6 +1246,18 @@ void CWriter::visitCallInst(CallInst &I) {
         writeOperand(I.getOperand(1));
         Out << ")";
         return;
+      case Intrinsic::setjmp:
+        Out << "setjmp(*(jmp_buf*)";
+        writeOperand(I.getOperand(1));
+        Out << ")";
+        return;
+      case Intrinsic::longjmp:
+        Out << "longjmp(*(jmp_buf*)";
+        writeOperand(I.getOperand(1));
+        Out << ", ";
+        writeOperand(I.getOperand(2));
+        Out << ")";
+        return;
       }
     }
   visitCallSite(&I);