mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16637 91177308-0d34-0410-b5e6-96231b3b80d8
145 lines
5.8 KiB
C++
145 lines
5.8 KiB
C++
//===- AsmWriterEmitter.cpp - Generate an assembly writer -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend is emits an assembly printer for the current target.
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// Note that this is currently fairly skeletal, but will grow over time.
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//
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//===----------------------------------------------------------------------===//
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#include "AsmWriterEmitter.h"
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#include "CodeGenTarget.h"
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#include "Record.h"
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#include <ostream>
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using namespace llvm;
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static bool isIdentChar(char C) {
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return (C >= 'a' && C <= 'z') ||
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(C >= 'A' && C <= 'Z') ||
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(C >= '0' && C <= '9') ||
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C == '_';
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}
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void AsmWriterEmitter::run(std::ostream &O) {
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EmitSourceFileHeader("Assembly Writer Source Fragment", O);
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O << "namespace llvm {\n\n";
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CodeGenTarget Target;
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Record *AsmWriter = Target.getAsmWriter();
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std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
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unsigned Variant = AsmWriter->getValueAsInt("Variant");
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O <<
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"/// printInstruction - This method is automatically generated by tablegen\n"
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"/// from the instruction set description. This method returns true if the\n"
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"/// machine instruction was sufficiently described to print it, otherwise\n"
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"/// it returns false.\n"
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"bool " << Target.getName() << ClassName
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<< "::printInstruction(const MachineInstr *MI) {\n";
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O << " switch (MI->getOpcode()) {\n"
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" default: return false;\n";
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std::string Namespace = Target.inst_begin()->second.Namespace;
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bool inVariant = false; // True if we are inside a {.|.|.} region.
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for (CodeGenTarget::inst_iterator I = Target.inst_begin(),
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E = Target.inst_end(); I != E; ++I)
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if (!I->second.AsmString.empty()) {
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const std::string &AsmString = I->second.AsmString;
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O << " case " << Namespace << "::" << I->first << ": O ";
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std::string::size_type LastEmitted = 0;
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while (LastEmitted != AsmString.size()) {
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std::string::size_type DollarPos =
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AsmString.find_first_of("${|}", LastEmitted);
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if (DollarPos == std::string::npos) DollarPos = AsmString.size();
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// Emit a constant string fragment.
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if (DollarPos != LastEmitted) {
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// TODO: this should eventually handle escaping.
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O << " << \"" << std::string(AsmString.begin()+LastEmitted,
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AsmString.begin()+DollarPos) << "\"";
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LastEmitted = DollarPos;
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} else if (AsmString[DollarPos] == '{') {
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if (inVariant)
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throw "Nested variants found for instruction '" + I->first + "'!";
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LastEmitted = DollarPos+1;
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inVariant = true; // We are now inside of the variant!
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for (unsigned i = 0; i != Variant; ++i) {
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// Skip over all of the text for an irrelevant variant here. The
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// next variant starts at |, or there may not be text for this
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// variant if we see a }.
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std::string::size_type NP =
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AsmString.find_first_of("|}", LastEmitted);
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if (NP == std::string::npos)
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throw "Incomplete variant for instruction '" + I->first + "'!";
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LastEmitted = NP+1;
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if (AsmString[NP] == '}') {
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inVariant = false; // No text for this variant.
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break;
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}
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}
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} else if (AsmString[DollarPos] == '|') {
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if (!inVariant)
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throw "'|' character found outside of a variant in instruction '"
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+ I->first + "'!";
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// Move to the end of variant list.
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std::string::size_type NP = AsmString.find('}', LastEmitted);
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if (NP == std::string::npos)
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throw "Incomplete variant for instruction '" + I->first + "'!";
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LastEmitted = NP+1;
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inVariant = false;
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} else if (AsmString[DollarPos] == '}') {
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if (!inVariant)
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throw "'}' character found outside of a variant in instruction '"
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+ I->first + "'!";
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LastEmitted = DollarPos+1;
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inVariant = false;
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} else if (DollarPos+1 != AsmString.size() &&
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AsmString[DollarPos+1] == '$') {
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O << " << '$'"; // "$$" -> $
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} else {
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// Get the name of the variable.
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// TODO: should eventually handle ${foo}bar as $foo
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std::string::size_type VarEnd = DollarPos+1;
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while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
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++VarEnd;
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std::string VarName(AsmString.begin()+DollarPos+1,
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AsmString.begin()+VarEnd);
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if (VarName.empty())
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throw "Stray '$' in '" + I->first +
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"' asm string, maybe you want $$?";
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unsigned OpNo = I->second.getOperandNamed(VarName);
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// If this is a two-address instruction and we are not accessing the
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// 0th operand, remove an operand.
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unsigned MIOp = I->second.OperandList[OpNo].MIOperandNo;
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if (I->second.isTwoAddress && MIOp != 0) {
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if (MIOp == 1)
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throw "Should refer to operand #0 instead of #1 for two-address"
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" instruction '" + I->first + "'!";
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--MIOp;
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}
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O << "; " << I->second.OperandList[OpNo].PrinterMethodName
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<< "(MI, " << MIOp << ", MVT::"
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<< getName(I->second.OperandList[OpNo].Ty) << "); O ";
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LastEmitted = VarEnd;
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}
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}
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O << " << '\\n'; break;\n";
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}
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O << " }\n"
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" return true;\n"
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"}\n";
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O << "} // End llvm namespace \n";
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}
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