1 files changed, 80 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp b/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp
new file mode 100644
index 0000000..66d57b0
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+++ b/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp
@@ -0,0 +1,80 @@
+//===- LowerInvoke.cpp - Eliminate Invoke instructions --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This transformation is designed for use by code generators which do not yet
+// support stack unwinding.  This pass converts 'invoke' instructions to 'call'
+// instructions, so that any exception-handling 'landingpad' blocks become dead
+// code (which can be removed by running the '-simplifycfg' pass afterwards).
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "lowerinvoke"
+
+STATISTIC(NumInvokes, "Number of invokes replaced");
+
+namespace {
+  class LowerInvoke : public FunctionPass {
+  public:
+    static char ID; // Pass identification, replacement for typeid
+    explicit LowerInvoke() : FunctionPass(ID) {
+      initializeLowerInvokePass(*PassRegistry::getPassRegistry());
+    }
+    bool runOnFunction(Function &F) override;
+  };
+}
+
+char LowerInvoke::ID = 0;
+INITIALIZE_PASS(LowerInvoke, "lowerinvoke",
+                "Lower invoke and unwind, for unwindless code generators",
+                false, false)
+
+char &llvm::LowerInvokePassID = LowerInvoke::ID;
+
+// Public Interface To the LowerInvoke pass.
+FunctionPass *llvm::createLowerInvokePass() {
+  return new LowerInvoke();
+}
+
+bool LowerInvoke::runOnFunction(Function &F) {
+  bool Changed = false;
+  for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
+    if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) {
+      SmallVector<Value*,16> CallArgs(II->op_begin(), II->op_end() - 3);
+      // Insert a normal call instruction...
+      CallInst *NewCall = CallInst::Create(II->getCalledValue(),
+                                           CallArgs, "", II);
+      NewCall->takeName(II);
+      NewCall->setCallingConv(II->getCallingConv());
+      NewCall->setAttributes(II->getAttributes());
+      NewCall->setDebugLoc(II->getDebugLoc());
+      II->replaceAllUsesWith(NewCall);
+
+      // Insert an unconditional branch to the normal destination.
+      BranchInst::Create(II->getNormalDest(), II);
+
+      // Remove any PHI node entries from the exception destination.
+      II->getUnwindDest()->removePredecessor(BB);
+
+      // Remove the invoke instruction now.
+      BB->getInstList().erase(II);
+
+      ++NumInvokes; Changed = true;
+    }
+  return Changed;
+}