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#include "Record.h"
#include "CodeEmitterGen.h"
void CodeEmitterGen::createEmitter(std::ostream &o) {
std::vector<Record*> Insts;
const std::map<std::string, Record*> &Defs = Records.getDefs();
Record *Inst = Records.getClass("Instruction");
assert(Inst && "Couldn't find Instruction class!");
for (std::map<std::string, Record*>::const_iterator I = Defs.begin(),
E = Defs.end(); I != E; ++I)
if (I->second->isSubClassOf(Inst))
Insts.push_back(I->second);
std::string Namespace = "V9::";
std::string ClassName = "SparcV9CodeEmitter::";
//const std::string &Namespace = Inst->getValue("Namespace")->getName();
o << "unsigned " << ClassName
<< "getBinaryCodeForInstr(MachineInstr &MI) {\n"
<< " unsigned Value = 0;\n"
<< " DEBUG(std::cerr << MI);\n"
<< " switch (MI.getOpcode()) {\n";
for (std::vector<Record*>::iterator I = Insts.begin(), E = Insts.end();
I != E; ++I)
{
Record *R = *I;
o << " case " << Namespace << R->getName() << ": {\n"
<< " DEBUG(std::cerr << \"Emitting " << R->getName() << "\\n\");\n";
const RecordVal *InstVal = R->getValue("Inst");
Init *InitVal = InstVal->getValue();
assert(dynamic_cast<BitsInit*>(InitVal) &&
"Can only handle undefined bits<> types!");
BitsInit *BI = (BitsInit*)InitVal;
unsigned Value = 0;
const std::vector<RecordVal> &Vals = R->getValues();
o << " // prefilling: ";
// Start by filling in fixed values...
for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i) {
if (BitInit *B = dynamic_cast<BitInit*>(BI->getBit(e-i-1))) {
Value |= B->getValue() << (e-i-1);
o << B->getValue();
} else {
o << "0";
}
}
o << "\n";
o << " // " << *InstVal << "\n";
o << " Value = " << Value << "U;\n\n";
// Loop over all of the fields in the instruction adding in any
// contributions to this value (due to bit references).
//
unsigned op = 0;
std::map<const std::string,unsigned> OpOrder;
for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
if (Vals[i].getName() != "Inst" &&
!Vals[i].getValue()->isComplete() &&
/* ignore annul and predict bits since no one sets them yet */
Vals[i].getName() != "annul" &&
Vals[i].getName() != "predict")
{
o << " // op" << op << ": " << Vals[i].getName() << "\n"
<< " int64_t op" << op
<<" = getMachineOpValue(MI, MI.getOperand("<<op<<"));\n";
//<< " MachineOperand &op" << op <<" = MI.getOperand("<<op<<");\n";
OpOrder[Vals[i].getName()] = op++;
}
}
unsigned Offset = 31;
for (int f = Vals.size()-1; f >= 0; --f) {
if (Vals[f].getPrefix()) {
BitsInit *FieldInitializer = (BitsInit*)Vals[f].getValue();
// Scan through the field looking for bit initializers of the current
// variable...
for (int i = FieldInitializer->getNumBits()-1; i >= 0; --i) {
if (BitInit *BI=dynamic_cast<BitInit*>(FieldInitializer->getBit(i))){
--Offset;
} else if (UnsetInit *UI =
dynamic_cast<UnsetInit*>(FieldInitializer->getBit(i))) {
--Offset;
} else if (VarBitInit *VBI =
dynamic_cast<VarBitInit*>(FieldInitializer->getBit(i))) {
TypedInit *TI = VBI->getVariable();
if (VarInit *VI = dynamic_cast<VarInit*>(TI)) {
o << " Value |= getValueBit(op" << OpOrder[VI->getName()]
<< ", " << VBI->getBitNum()
<< ")" << " << " << Offset << ";\n";
--Offset;
} else if (FieldInit *FI = dynamic_cast<FieldInit*>(TI)) {
// FIXME: implement this!
o << "FIELD INIT not implemented yet!\n";
} else {
o << "Error: UNIMPLEMENTED\n";
}
}
}
} else {
// ignore annul and predict bits since no one sets them yet
if (Vals[f].getName() == "annul" || Vals[f].getName() == "predict")
--Offset;
}
}
o << " break;\n"
<< " }\n";
}
o << " default:\n"
<< " DEBUG(std::cerr << \"Not supported instr: \" << MI << \"\\n\");\n"
<< " abort();\n"
<< " }\n"
<< " return Value;\n"
<< "}\n";
}
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