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MC CFG: Split MCBasicBlocks to mirror atom splitting.

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When an MCTextAtom is split, all MCBasicBlocks backed by it are
automatically split, with a fallthrough between both blocks, and
the successors moved to the second block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ahmed Bougacha
2013-08-21 07:28:24 +00:00
parent 46d353f8e8
commit aeb2bbcb6d
5 changed files with 65 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
lib/MC/MCFunction.cpp
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@ -46,8 +46,9 @@ MCBasicBlock *MCFunction::find(uint64_t StartAddr) {
// MCBasicBlock
MCBasicBlock::MCBasicBlock(const MCTextAtom &Insts, MCFunction *Parent)
: Insts(&Insts), Parent(Parent)
{}
: Insts(&Insts), Parent(Parent) {
getParent()->getParent()->trackBBForAtom(&Insts, this);
}
void MCBasicBlock::addSuccessor(const MCBasicBlock *MCBB) {
if (!isSuccessor(MCBB))
@ -68,3 +69,14 @@ bool MCBasicBlock::isPredecessor(const MCBasicBlock *MCBB) const {
return std::find(Predecessors.begin(), Predecessors.end(),
MCBB) != Predecessors.end();
}
void MCBasicBlock::splitBasicBlock(MCBasicBlock *SplitBB) {
assert(Insts->getEndAddr() + 1 == SplitBB->Insts->getBeginAddr() &&
"Splitting unrelated basic blocks!");
SplitBB->addPredecessor(this);
assert(SplitBB->Successors.empty() &&
"Split basic block shouldn't already have successors!");
SplitBB->Successors = Successors;
Successors.clear();
addSuccessor(SplitBB);
}