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Teach tablegen to generate code that is VC++ warning-free.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25709 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jeff Cohen 2006-01-27 22:22:28 +00:00
parent c15d18c501
commit 9b0ffca478
2 changed files with 65 additions and 23 deletions
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78
utils/TableGen/DAGISelEmitter.cpp
View File

@ -1828,6 +1828,7 @@ private:
// Matched instruction.
TreePatternNode *Instruction;
unsigned PatternNo;
bool GotosFail;
std::ostream &OS;
// Node to name mapping
std::map<std::string, std::string> VariableMap;
@ -1843,7 +1844,9 @@ public:
TreePatternNode *pattern, TreePatternNode *instr,
unsigned PatNum, std::ostream &os) :
ISE(ise), Predicates(preds), Pattern(pattern), Instruction(instr),
PatternNo(PatNum), OS(os), TmpNo(0) {}
PatternNo(PatNum), GotosFail(false), OS(os), TmpNo(0) {}
bool UsesFailLabel() { return GotosFail; }
/// EmitMatchCode - Emit a matcher for N, going to the label for PatternNo
/// if the match fails. At this point, we already know that the opcode for N
@ -1862,8 +1865,10 @@ public:
else
OS << " && ";
OS << "!(" << Def->getValueAsString("CondString") << ")";
if (i == e-1)
if (i == e-1) {
OS << ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
}
} else {
Def->dump();
assert(0 && "Unknown predicate type!");
@ -1877,6 +1882,7 @@ public:
OS << " if (cast<ConstantSDNode>(" << RootName
<< ")->getSignExtended() != " << II->getValue() << ")\n"
<< " goto P" << PatternNo << "Fail;\n";
GotosFail = true;
return;
} else if (!NodeIsComplexPattern(N)) {
assert(0 && "Cannot match this as a leaf value!");
@ -1897,6 +1903,7 @@ public:
// previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName
<< ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
return;
}
@ -1918,18 +1925,23 @@ public:
const SDNodeInfo &CInfo = ISE.getSDNodeInfo(N->getOperator());
OS << " if (!" << RootName << ".hasOneUse()) goto P"
<< PatternNo << "Fail; // Multiple uses of actual result?\n";
GotosFail = true;
EmittedUseCheck = true;
// hasOneUse() check is not strong enough. If the original node has
// already been selected, it may have been replaced with another.
for (unsigned j = 0; j < CInfo.getNumResults(); j++)
for (unsigned j = 0; j < CInfo.getNumResults(); j++) {
OS << " if (CodeGenMap.count(" << RootName
<< ".getValue(" << j << "))) goto P"
<< PatternNo << "Fail; // Already selected?\n";
GotosFail = true;
}
EmittedSlctedCheck = true;
if (NodeHasChain)
if (NodeHasChain) {
OS << " if (CodeGenMap.count(" << RootName
<< ".getValue(" << CInfo.getNumResults() << "))) goto P"
<< PatternNo << "Fail; // Already selected for a chain use?\n";
GotosFail = true;
}
}
if (NodeHasChain) {
if (!FoundChain) {
@ -1956,14 +1968,17 @@ public:
if (!EmittedUseCheck) {
OS << " if (!" << RootName << ".hasOneUse()) goto P"
<< PatternNo << "Fail; // Multiple uses of actual result?\n";
GotosFail = true;
}
if (!EmittedSlctedCheck)
// hasOneUse() check is not strong enough. If the original node has
// already been selected, it may have been replaced with another.
for (unsigned j = 0; j < CInfo.getNumResults(); j++)
for (unsigned j = 0; j < CInfo.getNumResults(); j++) {
OS << " if (CodeGenMap.count(" << RootName
<< ".getValue(" << j << "))) goto P"
<< PatternNo << "Fail; // Already selected?\n";
GotosFail = true;
}
}
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
@ -1976,6 +1991,7 @@ public:
const SDNodeInfo &CInfo = ISE.getSDNodeInfo(Child->getOperator());
OS << " if (" << RootName << OpNo << ".getOpcode() != "
<< CInfo.getEnumName() << ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
EmitMatchCode(Child, RootName + utostr(OpNo), FoundChain);
if (NodeHasProperty(Child, SDNodeInfo::SDNPHasChain, ISE)) {
FoldedChains.push_back(std::make_pair(RootName + utostr(OpNo),
@ -1989,12 +2005,13 @@ public:
if (VarMapEntry.empty()) {
VarMapEntry = RootName + utostr(OpNo);
} else {
// If we get here, this is a second reference to a specific name. Since
// we already have checked that the first reference is valid, we don't
// have to recursively match it, just check that it's the same as the
// previously named thing.
// If we get here, this is a second reference to a specific name.
// Since we already have checked that the first reference is valid,
// we don't have to recursively match it, just check that it's the
// same as the previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName << OpNo
<< ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
Duplicates.insert(RootName + utostr(OpNo));
continue;
}
@ -2016,21 +2033,25 @@ public:
OS << " if (cast<VTSDNode>(" << RootName << OpNo << ")->getVT() != "
<< "MVT::" << LeafRec->getName() << ") goto P" << PatternNo
<< "Fail;\n";
GotosFail = true;
} else if (LeafRec->isSubClassOf("CondCode")) {
// Make sure this is the specified cond code.
OS << " if (cast<CondCodeSDNode>(" << RootName << OpNo
<< ")->get() != " << "ISD::" << LeafRec->getName()
<< ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
} else {
Child->dump();
std::cerr << " ";
assert(0 && "Unknown leaf type!");
}
} else if (IntInit *II = dynamic_cast<IntInit*>(Child->getLeafValue())) {
OS << " if (!isa<ConstantSDNode>(" << RootName << OpNo << ") ||\n"
OS << " if (!isa<ConstantSDNode>(" << RootName << OpNo
<< ") ||\n"
<< " cast<ConstantSDNode>(" << RootName << OpNo
<< ")->getSignExtended() != " << II->getValue() << ")\n"
<< " goto P" << PatternNo << "Fail;\n";
GotosFail = true;
} else {
Child->dump();
assert(0 && "Unknown leaf type!");
@ -2039,9 +2060,11 @@ public:
}
// If there is a node predicate for this, emit the call.
if (!N->getPredicateFn().empty())
if (!N->getPredicateFn().empty()) {
OS << " if (!" << N->getPredicateFn() << "(" << RootName
<< ".Val)) goto P" << PatternNo << "Fail;\n";
GotosFail = true;
}
}
/// EmitResultCode - Emit the action for a pattern. Now that it has matched
@ -2072,7 +2095,8 @@ public:
case MVT::i32: OS << " unsigned Tmp"; break;
case MVT::i64: OS << " uint64_t Tmp"; break;
}
OS << ResNo << "C = cast<ConstantSDNode>(" << Val << ")->getValue();\n";
OS << ResNo << "C = (unsigned)cast<ConstantSDNode>(" << Val
<< ")->getValue();\n";
OS << " SDOperand Tmp" << utostr(ResNo)
<< " = CurDAG->getTargetConstant(Tmp"
<< ResNo << "C, MVT::" << getEnumName(N->getTypeNum(0)) << ");\n";
@ -2112,6 +2136,7 @@ public:
for (unsigned i = 0; i < NumRes; i++)
OS << ", Tmp" << i + ResNo;
OS << ")) goto P" << PatternNo << "Fail;\n";
GotosFail = true;
TmpNo = ResNo + NumRes;
} else {
OS << " SDOperand Tmp" << ResNo << " = Select(" << Val << ");\n";
@ -2416,6 +2441,7 @@ public:
Pat->setTypes(Other->getExtTypes());
OS << " if (" << Prefix << ".Val->getValueType(0) != MVT::"
<< getName(Pat->getTypeNum(0)) << ") goto P" << PatternNo << "Fail;\n";
GotosFail = true;
return true;
}
@ -2528,8 +2554,9 @@ private:
/// EmitCodeForPattern - Given a pattern to match, emit code to the specified
/// stream to match the pattern, and generate the code for the match if it
/// succeeds.
void DAGISelEmitter::EmitCodeForPattern(PatternToMatch &Pattern,
/// succeeds. Returns true if execution may jump to the fail label instead of
/// returning.
bool DAGISelEmitter::EmitCodeForPattern(PatternToMatch &Pattern,
std::ostream &OS) {
static unsigned PatternCount = 0;
unsigned PatternNo = PatternCount++;
@ -2591,7 +2618,12 @@ void DAGISelEmitter::EmitCodeForPattern(PatternToMatch &Pattern,
delete Pat;
if (Emitter.UsesFailLabel())
OS << " }\n P" << PatternNo << "Fail:\n";
else
OS << " }\n";
return Emitter.UsesFailLabel();
}
@ -2658,14 +2690,24 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
std::stable_sort(Patterns.begin(), Patterns.end(),
PatternSortingPredicate(*this));
for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
EmitCodeForPattern(*Patterns[i], OS);
bool mightNotReturn = true;
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
if (!mightNotReturn) {
std::cerr << "Pattern "
<< Patterns[i]->getDstPattern()->getOperator()->getName()
<< " is impossible to select!\n";
exit(1);
}
mightNotReturn = EmitCodeForPattern(*Patterns[i], OS);
}
if (mightNotReturn)
OS << " std::cerr << \"Cannot yet select: \";\n"
<< " N.Val->dump(CurDAG);\n"
<< " std::cerr << '\\n';\n"
<< " abort();\n"
<< "}\n\n";
<< " abort();\n";
OS << "}\n\n";
}
// Emit boilerplate.

2
utils/TableGen/DAGISelEmitter.h
View File

@ -468,7 +468,7 @@ private:
std::map<std::string, Record*> &InstResults,
std::vector<Record*> &InstImpInputs,
std::vector<Record*> &InstImpResults);
void EmitCodeForPattern(PatternToMatch &Pattern, std::ostream &OS);
bool EmitCodeForPattern(PatternToMatch &Pattern, std::ostream &OS);
void EmitInstructionSelector(std::ostream &OS);
};