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//===- AsmMatcherEmitter.cpp - Generate an assembly matcher ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits a target specifier matcher for converting parsed
// assembly operands in the MCInst structures.
//
//===----------------------------------------------------------------------===//
#include "AsmMatcherEmitter.h"
#include "CodeGenTarget.h"
#include "Record.h"
using namespace llvm;
static std::string FlattenVariants(const std::string &AsmString,
unsigned Index) {
StringRef Cur = AsmString;
std::string Res = "";
for (;;) {
std::pair<StringRef, StringRef> Split = Cur.split('{');
Res += Split.first;
if (Split.second.empty())
break;
std::pair<StringRef, StringRef> Inner = Cur.split('}');
StringRef Selection = Inner.first;
for (unsigned i = 0; i != Index; ++i)
Selection = Selection.split('|').second;
Selection = Selection.split('|').first;
Res += Selection;
Cur = Inner.second;
}
return Res;
}
void AsmMatcherEmitter::run(raw_ostream &OS) {
CodeGenTarget Target;
const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
Record *AsmParser = Target.getAsmParser();
std::string ClassName = AsmParser->getValueAsString("AsmParserClassName");
std::string Namespace = Registers[0].TheDef->getValueAsString("Namespace");
EmitSourceFileHeader("Assembly Matcher Source Fragment", OS);
// Emit the function to match a register name to number.
OS << "bool " << Target.getName() << ClassName
<< "::MatchRegisterName(const StringRef &Name, unsigned &RegNo) {\n";
// FIXME: TableGen should have a fast string matcher generator.
for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
const CodeGenRegister &Reg = Registers[i];
if (Reg.TheDef->getValueAsString("AsmName").empty())
continue;
OS << " if (Name == \""
<< Reg.TheDef->getValueAsString("AsmName") << "\")\n"
<< " return RegNo=" << i + 1 << ", false;\n";
}
OS << " return true;\n";
OS << "}\n";
// Emit the function to match instructions.
std::vector<const CodeGenInstruction*> NumberedInstructions;
Target.getInstructionsByEnumValue(NumberedInstructions);
const std::map<std::string, CodeGenInstruction> &Instructions =
Target.getInstructions();
for (std::map<std::string, CodeGenInstruction>::const_iterator
it = Instructions.begin(), ie = Instructions.end(); it != ie; ++it) {
const CodeGenInstruction &CGI = it->second;
if (it->first != "SUB8rr")
continue;
/*
def SUB8rr : I<0x28, MRMDestReg, (outs GR8:$dst), (ins GR8:$src1, GR8:$src2),
"sub{b}\t{$src2, $dst|$dst, $src2}",
[(set GR8:$dst, (sub GR8:$src1, GR8:$src2)),
(implicit EFLAGS)]>;
*/
outs() << it->first << " "
<< FlattenVariants(CGI.AsmString, 0)
<< "\n";
}
}
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