[llvm-commits] [llvm] r137744 - in /llvm/trunk: include/llvm/BasicBlock.h lib/VMCore/BasicBlock.cpp

[Bill Wendling]

Author: void
Date: Tue Aug 16 15:42:52 2011
New Revision: 137744

URL: http://llvm.org/viewvc/llvm-project?rev=137744&view=rev
Log:
Add getFirstInsertionPt() method.

getFirstInsertionPt() returns an iterator to the first insertion point in a
basic block. This is after all PHIs and any other instruction which is required
to be at the top of the basic block (like LandingPadInst).

Modified:
    llvm/trunk/include/llvm/BasicBlock.h
    llvm/trunk/lib/VMCore/BasicBlock.cpp

Modified: llvm/trunk/include/llvm/BasicBlock.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/BasicBlock.h?rev=137744&r1=137743&r2=137744&view=diff
==============================================================================
--- llvm/trunk/include/llvm/BasicBlock.h (original)
+++ llvm/trunk/include/llvm/BasicBlock.h Tue Aug 16 15:42:52 2011
@@ -145,6 +145,15 @@
     return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbgOrLifetime();
   }
 
+  /// getFirstInsertionPt - Returns an iterator to the first instruction in this
+  /// block that is suitable for inserting a non-PHI instruction. In particular,
+  /// it skips all PHIs and LandingPad instructions. Returns 0 if there are no
+  /// non-PHI instructions.
+  iterator getFirstInsertionPt();
+  const_iterator getFirstInsertionPt() const {
+    return const_cast<BasicBlock*>(this)->getFirstInsertionPt();
+  }
+
   /// removeFromParent - This method unlinks 'this' from the containing
   /// function, but does not delete it.
   ///

Modified: llvm/trunk/lib/VMCore/BasicBlock.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/BasicBlock.cpp?rev=137744&r1=137743&r2=137744&view=diff
==============================================================================
--- llvm/trunk/lib/VMCore/BasicBlock.cpp (original)
+++ llvm/trunk/lib/VMCore/BasicBlock.cpp Tue Aug 16 15:42:52 2011
@@ -167,6 +167,12 @@
   return &*i;
 }
 
+BasicBlock::iterator BasicBlock::getFirstInsertionPt() {
+  iterator InsertPt = getFirstNonPHI();
+  if (isa<LandingPadInst>(InsertPt)) ++InsertPt;
+  return InsertPt;
+}
+
 void BasicBlock::dropAllReferences() {
   for(iterator I = begin(), E = end(); I != E; ++I)
     I->dropAllReferences();