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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
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27
lib/MC/MCModule.cpp
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@@ -103,6 +103,33 @@ MCFunction *MCModule::createFunction(StringRef Name) {
return Functions.back();
}
static bool CompBBToAtom(MCBasicBlock *BB, const MCTextAtom *Atom) {
return BB->getInsts() < Atom;
}
void MCModule::splitBasicBlocksForAtom(const MCTextAtom *TA,
const MCTextAtom *NewTA) {
BBsByAtomTy::iterator
I = std::lower_bound(BBsByAtom.begin(), BBsByAtom.end(),
TA, CompBBToAtom);
for (; I != BBsByAtom.end() && (*I)->getInsts() == TA; ++I) {
MCBasicBlock *BB = *I;
MCBasicBlock *NewBB = &BB->getParent()->createBlock(*NewTA);
BB->splitBasicBlock(NewBB);
}
}
void MCModule::trackBBForAtom(const MCTextAtom *Atom, MCBasicBlock *BB) {
assert(Atom == BB->getInsts() && "Text atom doesn't back the basic block!");
BBsByAtomTy::iterator I = std::lower_bound(BBsByAtom.begin(),
BBsByAtom.end(),
Atom, CompBBToAtom);
for (; I != BBsByAtom.end() && (*I)->getInsts() == Atom; ++I)
if (*I == BB)
return;
BBsByAtom.insert(I, BB);
}
MCModule::~MCModule() {
for (AtomListTy::iterator AI = atom_begin(),
AE = atom_end();