New EH representation for MSVC compatibility
This introduces new instructions neccessary to implement MSVC-compatible
exception handling support. Most of the middle-end and none of the
back-end haven't been audited or updated to take them into account.
Differential Revision: http://reviews.llvm.org/D11097
llvm-svn: 243766
diff --git a/llvm/lib/IR/BasicBlock.cpp b/llvm/lib/IR/BasicBlock.cpp
index 0a04494..b5671a6 100644
--- a/llvm/lib/IR/BasicBlock.cpp
+++ b/llvm/lib/IR/BasicBlock.cpp
@@ -197,7 +197,7 @@
return end();
iterator InsertPt = FirstNonPHI;
- if (isa<LandingPadInst>(InsertPt)) ++InsertPt;
+ if (InsertPt->isEHPad()) ++InsertPt;
return InsertPt;
}
@@ -333,6 +333,17 @@
}
}
+bool BasicBlock::canSplitPredecessors() const {
+ const Instruction *FirstNonPHI = getFirstNonPHI();
+ if (isa<LandingPadInst>(FirstNonPHI))
+ return true;
+ // This is perhaps a little conservative because constructs like
+ // CleanupBlockInst are pretty easy to split. However, SplitBlockPredecessors
+ // cannot handle such things just yet.
+ if (FirstNonPHI->isEHPad())
+ return false;
+ return true;
+}
/// This splits a basic block into two at the specified
/// instruction. Note that all instructions BEFORE the specified iterator stay