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Correctly parse variant notation 

llvm-svn: 16637
This commit is contained in:
Chris Lattner 2004-10-03 20:19:02 +00:00
parent 91c538f2a1
commit 72770f5877
1 changed files with 42 additions and 6 deletions
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48
llvm/utils/TableGen/AsmWriterEmitter.cpp
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@ -30,24 +30,24 @@ void AsmWriterEmitter::run(std::ostream &O) {
O << "namespace llvm {\n\n";
CodeGenTarget Target;
Record *AsmWriter = Target.getAsmWriter();
std::string AsmWriterClassName =
AsmWriter->getValueAsString("AsmWriterClassName");
std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
unsigned Variant = AsmWriter->getValueAsInt("Variant");
O <<
"/// printInstruction - This method is automatically generated by tablegen\n"
"/// from the instruction set description. This method returns true if the\n"
"/// machine instruction was sufficiently described to print it, otherwise\n"
"/// it returns false.\n"
"bool " << Target.getName() << AsmWriterClassName
"bool " << Target.getName() << ClassName
<< "::printInstruction(const MachineInstr *MI) {\n";
O << " switch (MI->getOpcode()) {\n"
" default: return false;\n";
std::string Namespace = Target.inst_begin()->second.Namespace;
bool inVariant = false; // True if we are inside a {.|.|.} region.
for (CodeGenTarget::inst_iterator I = Target.inst_begin(),
E = Target.inst_end(); I != E; ++I)
if (!I->second.AsmString.empty()) {
@ -56,7 +56,8 @@ void AsmWriterEmitter::run(std::ostream &O) {
std::string::size_type LastEmitted = 0;
while (LastEmitted != AsmString.size()) {
std::string::size_type DollarPos = AsmString.find('$', LastEmitted);
std::string::size_type DollarPos =
AsmString.find_first_of("${|}", LastEmitted);
if (DollarPos == std::string::npos) DollarPos = AsmString.size();
// Emit a constant string fragment.
@ -65,6 +66,41 @@ void AsmWriterEmitter::run(std::ostream &O) {
O << " << \"" << std::string(AsmString.begin()+LastEmitted,
AsmString.begin()+DollarPos) << "\"";
LastEmitted = DollarPos;
} else if (AsmString[DollarPos] == '{') {
if (inVariant)
throw "Nested variants found for instruction '" + I->first + "'!";
LastEmitted = DollarPos+1;
inVariant = true; // We are now inside of the variant!
for (unsigned i = 0; i != Variant; ++i) {
// Skip over all of the text for an irrelevant variant here. The
// next variant starts at |, or there may not be text for this
// variant if we see a }.
std::string::size_type NP =
AsmString.find_first_of("|}", LastEmitted);
if (NP == std::string::npos)
throw "Incomplete variant for instruction '" + I->first + "'!";
LastEmitted = NP+1;
if (AsmString[NP] == '}') {
inVariant = false; // No text for this variant.
break;
}
}
} else if (AsmString[DollarPos] == '|') {
if (!inVariant)
throw "'|' character found outside of a variant in instruction '"
+ I->first + "'!";
// Move to the end of variant list.
std::string::size_type NP = AsmString.find('}', LastEmitted);
if (NP == std::string::npos)
throw "Incomplete variant for instruction '" + I->first + "'!";
LastEmitted = NP+1;
inVariant = false;
} else if (AsmString[DollarPos] == '}') {
if (!inVariant)
throw "'}' character found outside of a variant in instruction '"
+ I->first + "'!";
LastEmitted = DollarPos+1;
inVariant = false;
} else if (DollarPos+1 != AsmString.size() &&
AsmString[DollarPos+1] == '$') {
O << " << '$'"; // "$$" -> $