From e42cde2a14bb1d4dbb659d8ecdf7c73131532f1c Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 15 Feb 2004 22:51:47 +0000
Subject: [PATCH] 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!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11484 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/CBackend/CBackend.cpp | 17 +++++++++++++++--
 lib/Target/CBackend/Writer.cpp   | 17 +++++++++++++++--
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 0d36ea73c32..b52db0346a9 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.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);
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 0d36ea73c32..b52db0346a9 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/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);