mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-27 14:45:50 +00:00
9302ba416b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15649 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
3.8 KiB
C++
101 lines
3.8 KiB
C++
//===- AsmWriterEmitter.cpp - Generate an assembly writer -----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This tablegen backend is emits an assembly printer for the current target.
|
|
// Note that this is currently fairly skeletal, but will grow over time.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AsmWriterEmitter.h"
|
|
#include "CodeGenTarget.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 == '_';
|
|
}
|
|
|
|
void AsmWriterEmitter::run(std::ostream &O) {
|
|
EmitSourceFileHeader("Assembly Writer Source Fragment", O);
|
|
|
|
CodeGenTarget Target;
|
|
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";
|
|
O << " switch (MI->getOpcode()) {\n"
|
|
" default: return false;\n";
|
|
|
|
std::string Namespace = Target.inst_begin()->second.Namespace;
|
|
|
|
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 ";
|
|
|
|
std::string::size_type LastEmitted = 0;
|
|
while (LastEmitted != AsmString.size()) {
|
|
std::string::size_type DollarPos = AsmString.find('$', LastEmitted);
|
|
if (DollarPos == std::string::npos) DollarPos = AsmString.size();
|
|
|
|
// Emit a constant string fragment.
|
|
if (DollarPos != LastEmitted) {
|
|
// TODO: this should eventually handle escaping.
|
|
O << " << \"" << std::string(AsmString.begin()+LastEmitted,
|
|
AsmString.begin()+DollarPos) << "\"";
|
|
LastEmitted = DollarPos;
|
|
} else if (DollarPos+1 != AsmString.size() &&
|
|
AsmString[DollarPos+1] == '$') {
|
|
O << " << '$'"; // "$$" -> $
|
|
} else {
|
|
// Get the name of the variable.
|
|
// TODO: should eventually handle ${foo}bar as $foo
|
|
std::string::size_type VarEnd = DollarPos+1;
|
|
while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
|
|
++VarEnd;
|
|
std::string VarName(AsmString.begin()+DollarPos+1,
|
|
AsmString.begin()+VarEnd);
|
|
if (VarName.empty())
|
|
throw "Stray '$' in '" + I->first +
|
|
"' asm string, maybe you want $$?";
|
|
unsigned OpNo = I->second.getOperandNamed(VarName);
|
|
|
|
// If this is a two-address instruction and we are not accessing the
|
|
// 0th operand, remove an operand.
|
|
unsigned MIOp = I->second.OperandList[OpNo].MIOperandNo;
|
|
if (I->second.isTwoAddress && MIOp != 0) {
|
|
if (MIOp == 1)
|
|
throw "Should refer to operand #0 instead of #1 for two-address"
|
|
" instruction '" + I->first + "'!";
|
|
--MIOp;
|
|
}
|
|
|
|
O << "; " << I->second.OperandList[OpNo].PrinterMethodName
|
|
<< "(MI, " << MIOp << ", MVT::"
|
|
<< getName(I->second.OperandList[OpNo].Ty) << "); O ";
|
|
LastEmitted = VarEnd;
|
|
}
|
|
}
|
|
|
|
O << " << '\\n'; break;\n";
|
|
}
|
|
|
|
O << " }\n"
|
|
" return true;\n"
|
|
"}\n";
|
|
EmitSourceFileTail(O);
|
|
}
|