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Add some more checking/verification code 

llvm-svn: 23344
This commit is contained in:
Chris Lattner 2005-09-14 02:11:12 +00:00
parent 4c7b604091
commit 4cfcb544bf
1 changed files with 19 additions and 2 deletions
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21
llvm/utils/TableGen/DAGISelEmitter.cpp
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@ -654,8 +654,12 @@ void DAGISelEmitter::ParseAndResolveInstructions() {
I->error("Could not infer all types in pattern!");
}
// SetDestinations - Keep track of all the virtual registers that are 'set'
// in the instruction, including what reg class they are.
std::map<std::string, Record*> SetDestinations;
// Verify that the top-level forms in the instruction are of void type, and
// figure out how many of the instruction operands are destinations.
// fill in the SetDestinations map.
for (unsigned j = 0, e = I->getNumTrees(); j != e; ++j) {
TreePatternNode *Pat = I->getTree(j);
if (Pat->getType() != MVT::isVoid) {
@ -677,16 +681,29 @@ void DAGISelEmitter::ParseAndResolveInstructions() {
TreePatternNode *Dest = Pat->getChild(i);
if (!Dest->isLeaf())
I->error("set destination should be a virtual register!");
DefInit *Val = dynamic_cast<DefInit*>(Dest->getLeafValue());
if (!Val)
I->error("set destination should be a virtual register!");
if (!Val->getDef()->isSubClassOf("RegisterClass"))
I->error("set destination should be a virtual register!");
if (Dest->getName().empty())
I->error("set destination must have a name!");
if (SetDestinations.count(Dest->getName()))
I->error("cannot set '" + Dest->getName() +"' multiple times");
SetDestinations[Dest->getName()] = Val->getDef();
}
}
}
// Now that we have operands that are sets, inspect the operands list for
// the instruction. This determines the order that operands are added to
// the machine instruction the node corresponds to.
assert(SetDestinations.size() == 1 &&
"This code only handles a single set right now!");
DEBUG(I->dump());
Instructions.push_back(I);