#include "AsmWriterEmitter.h"
#include "CodeGenTarget.h"
+#include "Record.h"
#include <ostream>
using namespace llvm;
+static bool isIdentChar(char C) {
+ return (C >= 'a' && C <= 'z') ||
+ (C >= 'A' && C <= 'Z') ||
+ (C >= '0' && C <= '9') ||
+ C == '_';
+}
+
+namespace {
+ struct AsmWriterOperand {
+ enum { isLiteralTextOperand, isMachineInstrOperand } OperandType;
+
+ /// Str - For isLiteralTextOperand, this IS the literal text. For
+ /// isMachineInstrOperand, this is the PrinterMethodName for the operand.
+ std::string Str;
+
+ /// MiOpNo - For isMachineInstrOperand, this is the operand number of the
+ /// machine instruction.
+ unsigned MIOpNo;
+
+ /// OpVT - For isMachineInstrOperand, this is the value type for the
+ /// operand.
+ MVT::ValueType OpVT;
+
+ AsmWriterOperand(const std::string &LitStr)
+ : OperandType(isLiteralTextOperand), Str(LitStr) {}
+
+ AsmWriterOperand(const std::string &Printer, unsigned OpNo,
+ MVT::ValueType VT) : OperandType(isMachineInstrOperand),
+ Str(Printer), MIOpNo(OpNo), OpVT(VT){}
+
+ void EmitCode(std::ostream &OS) const;
+ };
+
+ struct AsmWriterInst {
+ std::vector<AsmWriterOperand> Operands;
+
+ void ParseAsmString(const CodeGenInstruction &CGI, unsigned Variant);
+ void EmitCode(std::ostream &OS) const {
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ Operands[i].EmitCode(OS);
+ }
+ private:
+ void AddLiteralString(const std::string &Str) {
+ // If the last operand was already a literal text string, append this to
+ // it, otherwise add a new operand.
+ if (!Operands.empty() &&
+ Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
+ Operands.back().Str.append(Str);
+ else
+ Operands.push_back(AsmWriterOperand(Str));
+ }
+ };
+}
+
+
+void AsmWriterOperand::EmitCode(std::ostream &OS) const {
+ if (OperandType == isLiteralTextOperand)
+ OS << "O << \"" << Str << "\"; ";
+ else
+ OS << Str << "(MI, " << MIOpNo << ", MVT::" << getName(OpVT) << "); ";
+}
+
+
+/// ParseAsmString - Parse the specified Instruction's AsmString into this
+/// AsmWriterInst.
+///
+void AsmWriterInst::ParseAsmString(const CodeGenInstruction &CGI,
+ unsigned Variant) {
+ bool inVariant = false; // True if we are inside a {.|.|.} region.
+
+ const std::string &AsmString = CGI.AsmString;
+ std::string::size_type LastEmitted = 0;
+ while (LastEmitted != AsmString.size()) {
+ std::string::size_type DollarPos =
+ AsmString.find_first_of("${|}", LastEmitted);
+ if (DollarPos == std::string::npos) DollarPos = AsmString.size();
+
+ // Emit a constant string fragment.
+ if (DollarPos != LastEmitted) {
+ // TODO: this should eventually handle escaping.
+ AddLiteralString(std::string(AsmString.begin()+LastEmitted,
+ AsmString.begin()+DollarPos));
+ LastEmitted = DollarPos;
+ } else if (AsmString[DollarPos] == '{') {
+ if (inVariant)
+ throw "Nested variants found for instruction '" + CGI.Name + "'!";
+ LastEmitted = DollarPos+1;
+ inVariant = true; // We are now inside of the variant!
+ for (unsigned i = 0; i != Variant; ++i) {
+ // Skip over all of the text for an irrelevant variant here. The
+ // next variant starts at |, or there may not be text for this
+ // variant if we see a }.
+ std::string::size_type NP =
+ AsmString.find_first_of("|}", LastEmitted);
+ if (NP == std::string::npos)
+ throw "Incomplete variant for instruction '" + CGI.Name + "'!";
+ LastEmitted = NP+1;
+ if (AsmString[NP] == '}') {
+ inVariant = false; // No text for this variant.
+ break;
+ }
+ }
+ } else if (AsmString[DollarPos] == '|') {
+ if (!inVariant)
+ throw "'|' character found outside of a variant in instruction '"
+ + CGI.Name + "'!";
+ // Move to the end of variant list.
+ std::string::size_type NP = AsmString.find('}', LastEmitted);
+ if (NP == std::string::npos)
+ throw "Incomplete variant for instruction '" + CGI.Name + "'!";
+ LastEmitted = NP+1;
+ inVariant = false;
+ } else if (AsmString[DollarPos] == '}') {
+ if (!inVariant)
+ throw "'}' character found outside of a variant in instruction '"
+ + CGI.Name + "'!";
+ LastEmitted = DollarPos+1;
+ inVariant = false;
+ } else if (DollarPos+1 != AsmString.size() &&
+ AsmString[DollarPos+1] == '$') {
+ AddLiteralString("$"); // "$$" -> $
+ LastEmitted = DollarPos+2;
+ } else {
+ // Get the name of the variable.
+ // TODO: should eventually handle ${foo}bar as $foo
+ std::string::size_type VarEnd = DollarPos+1;
+ while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
+ ++VarEnd;
+ std::string VarName(AsmString.begin()+DollarPos+1,
+ AsmString.begin()+VarEnd);
+ if (VarName.empty())
+ throw "Stray '$' in '" + CGI.Name + "' asm string, maybe you want $$?";
+
+ unsigned OpNo = CGI.getOperandNamed(VarName);
+
+ // If this is a two-address instruction and we are not accessing the
+ // 0th operand, remove an operand.
+ unsigned MIOp = CGI.OperandList[OpNo].MIOperandNo;
+ if (CGI.isTwoAddress && MIOp != 0) {
+ if (MIOp == 1)
+ throw "Should refer to operand #0 instead of #1 for two-address"
+ " instruction '" + CGI.Name + "'!";
+ --MIOp;
+ }
+
+ Operands.push_back(AsmWriterOperand(CGI.OperandList[OpNo].PrinterMethodName,
+ MIOp, CGI.OperandList[OpNo].Ty));
+ LastEmitted = VarEnd;
+ }
+ }
+
+ AddLiteralString("\\n");
+}
+
+
void AsmWriterEmitter::run(std::ostream &O) {
EmitSourceFileHeader("Assembly Writer Source Fragment", O);
CodeGenTarget Target;
+ Record *AsmWriter = Target.getAsmWriter();
+ 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()
- << "AsmPrinter::printInstruction(const MachineInstr *MI) {\n";
+ "bool " << Target.getName() << ClassName
+ << "::printInstruction(const MachineInstr *MI) {\n";
O << " switch (MI->getOpcode()) {\n"
" default: return false;\n";
for (CodeGenTarget::inst_iterator I = Target.inst_begin(),
E = Target.inst_end(); I != E; ++I)
if (!I->second.AsmString.empty()) {
- const std::string &AsmString = I->second.AsmString;
- O << " case " << Namespace << "::" << I->first << ": O << \""
- << AsmString << "\" << '\\n'; break;\n";
+ O << " case " << Namespace << "::" << I->first << ": ";
+
+ AsmWriterInst AWI;
+ AWI.ParseAsmString(I->second, Variant);
+ AWI.EmitCode(O);
+ O << " break;\n";
}
O << " }\n"
" return true;\n"
"}\n";
- EmitSourceFileTail(O);
}
projects / oota-llvm.git / blobdiff