#include "llvm/BasicBlock.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
+#include "llvm/IntrinsicInst.h"
#include "llvm/LLVMContext.h"
#include "llvm/Type.h"
#include "llvm/ADT/STLExtras.h"
// Explicit instantiation of SymbolTableListTraits since some of the methods
// are not in the public header file...
-template class SymbolTableListTraits<Instruction, BasicBlock>;
+template class llvm::SymbolTableListTraits<Instruction, BasicBlock>;
BasicBlock::BasicBlock(LLVMContext &C, const Twine &Name, Function *NewParent,
BasicBlock::~BasicBlock() {
+ // If the address of the block is taken and it is being deleted (e.g. because
+ // it is dead), this means that there is either a dangling constant expr
+ // hanging off the block, or an undefined use of the block (source code
+ // expecting the address of a label to keep the block alive even though there
+ // is no indirect branch). Handle these cases by zapping the BlockAddress
+ // nodes. There are no other possible uses at this point.
+ if (hasAddressTaken()) {
+ assert(!use_empty() && "There should be at least one blockaddress!");
+ Constant *Replacement =
+ ConstantInt::get(llvm::Type::getInt32Ty(getContext()), 1);
+ while (!use_empty()) {
+ BlockAddress *BA = cast<BlockAddress>(use_back());
+ BA->replaceAllUsesWith(ConstantExpr::getIntToPtr(Replacement,
+ BA->getType()));
+ BA->destroyConstant();
+ }
+ }
+
assert(getParent() == 0 && "BasicBlock still linked into the program!");
dropAllReferences();
InstList.clear();
return &*i;
}
+Instruction* BasicBlock::getFirstNonPHIOrDbg() {
+ BasicBlock::iterator i = begin();
+ // All valid basic blocks should have a terminator,
+ // which is not a PHINode. If we have an invalid basic
+ // block we'll get an assertion failure when dereferencing
+ // a past-the-end iterator.
+ while (isa<PHINode>(i) || isa<DbgInfoIntrinsic>(i)) ++i;
+ return &*i;
+}
+
void BasicBlock::dropAllReferences() {
for(iterator I = begin(), E = end(); I != E; ++I)
I->dropAllReferences();
assert(I != InstList.end() &&
"Trying to get me to create degenerate basic block!");
- BasicBlock *InsertBefore = next(Function::iterator(this))
+ BasicBlock *InsertBefore = llvm::next(Function::iterator(this))
.getNodePtrUnchecked();
BasicBlock *New = BasicBlock::Create(getContext(), BBName,
getParent(), InsertBefore);
}
return New;
}
+