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Imported Upstream version 5.18.0.234
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external/llvm/utils/TableGen/AsmWriterInst.cpp
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external/llvm/utils/TableGen/AsmWriterInst.cpp
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//===- AsmWriterInst.h - Classes encapsulating a printable inst -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// These classes implement a parser for assembly strings.
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//
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//===----------------------------------------------------------------------===//
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#include "AsmWriterInst.h"
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#include "CodeGenTarget.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/Record.h"
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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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std::string AsmWriterOperand::getCode(bool PassSubtarget) const {
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if (OperandType == isLiteralTextOperand) {
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if (Str.size() == 1)
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return "O << '" + Str + "';";
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return "O << \"" + Str + "\";";
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}
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if (OperandType == isLiteralStatementOperand)
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return Str;
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std::string Result = Str + "(MI";
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if (MIOpNo != ~0U)
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Result += ", " + utostr(MIOpNo);
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if (PassSubtarget)
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Result += ", STI";
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Result += ", O";
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if (!MiModifier.empty())
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Result += ", \"" + MiModifier + '"';
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return Result + ");";
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}
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/// ParseAsmString - Parse the specified Instruction's AsmString into this
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/// AsmWriterInst.
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///
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AsmWriterInst::AsmWriterInst(const CodeGenInstruction &CGI, unsigned CGIIndex,
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unsigned Variant)
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: CGI(&CGI), CGIIndex(CGIIndex) {
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// NOTE: Any extensions to this code need to be mirrored in the
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// AsmPrinter::printInlineAsm code that executes as compile time (assuming
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// that inline asm strings should also get the new feature)!
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std::string AsmString = CGI.FlattenAsmStringVariants(CGI.AsmString, Variant);
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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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for (; LastEmitted != DollarPos; ++LastEmitted)
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switch (AsmString[LastEmitted]) {
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case '\n':
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AddLiteralString("\\n");
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break;
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case '\t':
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AddLiteralString("\\t");
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break;
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case '"':
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AddLiteralString("\\\"");
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break;
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case '\\':
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AddLiteralString("\\\\");
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break;
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default:
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AddLiteralString(std::string(1, AsmString[LastEmitted]));
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break;
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}
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} else if (AsmString[DollarPos] == '\\') {
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if (DollarPos+1 != AsmString.size()) {
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if (AsmString[DollarPos+1] == 'n') {
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AddLiteralString("\\n");
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} else if (AsmString[DollarPos+1] == 't') {
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AddLiteralString("\\t");
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} else if (std::string("${|}\\").find(AsmString[DollarPos+1])
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!= std::string::npos) {
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AddLiteralString(std::string(1, AsmString[DollarPos+1]));
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} else {
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PrintFatalError("Non-supported escaped character found in instruction '" +
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CGI.TheDef->getName() + "'!");
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}
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LastEmitted = DollarPos+2;
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continue;
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}
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} else if (DollarPos+1 != AsmString.size() &&
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AsmString[DollarPos+1] == '$') {
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AddLiteralString("$"); // "$$" -> $
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LastEmitted = DollarPos+2;
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} else {
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// Get the name of the variable.
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std::string::size_type VarEnd = DollarPos+1;
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// handle ${foo}bar as $foo by detecting whether the character following
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// the dollar sign is a curly brace. If so, advance VarEnd and DollarPos
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// so the variable name does not contain the leading curly brace.
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bool hasCurlyBraces = false;
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if (VarEnd < AsmString.size() && '{' == AsmString[VarEnd]) {
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hasCurlyBraces = true;
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++DollarPos;
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++VarEnd;
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}
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while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
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++VarEnd;
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StringRef VarName(AsmString.data()+DollarPos+1, VarEnd-DollarPos-1);
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// Modifier - Support ${foo:modifier} syntax, where "modifier" is passed
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// into printOperand. Also support ${:feature}, which is passed into
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// PrintSpecial.
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std::string Modifier;
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// In order to avoid starting the next string at the terminating curly
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// brace, advance the end position past it if we found an opening curly
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// brace.
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if (hasCurlyBraces) {
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if (VarEnd >= AsmString.size())
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PrintFatalError("Reached end of string before terminating curly brace in '"
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+ CGI.TheDef->getName() + "'");
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// Look for a modifier string.
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if (AsmString[VarEnd] == ':') {
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++VarEnd;
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if (VarEnd >= AsmString.size())
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PrintFatalError("Reached end of string before terminating curly brace in '"
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+ CGI.TheDef->getName() + "'");
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std::string::size_type ModifierStart = VarEnd;
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while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
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++VarEnd;
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Modifier = std::string(AsmString.begin()+ModifierStart,
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AsmString.begin()+VarEnd);
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if (Modifier.empty())
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PrintFatalError("Bad operand modifier name in '"+ CGI.TheDef->getName() + "'");
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}
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if (AsmString[VarEnd] != '}')
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PrintFatalError("Variable name beginning with '{' did not end with '}' in '"
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+ CGI.TheDef->getName() + "'");
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++VarEnd;
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}
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if (VarName.empty() && Modifier.empty())
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PrintFatalError("Stray '$' in '" + CGI.TheDef->getName() +
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"' asm string, maybe you want $$?");
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if (VarName.empty()) {
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// Just a modifier, pass this into PrintSpecial.
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Operands.emplace_back("PrintSpecial", ~0U, Modifier);
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} else {
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// Otherwise, normal operand.
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unsigned OpNo = CGI.Operands.getOperandNamed(VarName);
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CGIOperandList::OperandInfo OpInfo = CGI.Operands[OpNo];
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unsigned MIOp = OpInfo.MIOperandNo;
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Operands.emplace_back(OpInfo.PrinterMethodName, MIOp, Modifier);
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}
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LastEmitted = VarEnd;
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}
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}
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Operands.emplace_back("return;", AsmWriterOperand::isLiteralStatementOperand);
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}
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/// MatchesAllButOneOp - If this instruction is exactly identical to the
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/// specified instruction except for one differing operand, return the differing
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/// operand number. If more than one operand mismatches, return ~1, otherwise
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/// if the instructions are identical return ~0.
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unsigned AsmWriterInst::MatchesAllButOneOp(const AsmWriterInst &Other)const{
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if (Operands.size() != Other.Operands.size()) return ~1;
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unsigned MismatchOperand = ~0U;
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for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
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if (Operands[i] != Other.Operands[i]) {
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if (MismatchOperand != ~0U) // Already have one mismatch?
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return ~1U;
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MismatchOperand = i;
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}
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}
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return MismatchOperand;
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}
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