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* Now outputting a static function getBinaryCodeForInstr() (JIT-accessible)

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* For debugging purposes:
  + output the predefined bit pattern of the instruction
* Fixed inefficiency: only load an operand from MachineInstr once
* Bug fix: did not advance bit index when seeing named bit-fields "annul", "cc"
  and "predict"
* Added a catch-all for non-supported instructions at the end of switch stmt.

llvm-svn: 6368
This commit is contained in:
Misha Brukman 2003-05-27 22:19:58 +00:00
parent 30ca3282a1
commit 170b9ffe76
1 changed files with 33 additions and 16 deletions
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49
support/tools/TableGen/CodeEmitterGen.cpp
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@ -18,9 +18,10 @@ void CodeEmitterGen::createEmitter(std::ostream &o) {
std::string ClassName = "SparcV9CodeEmitter::";
//const std::string &Namespace = Inst->getValue("Namespace")->getName();
o << "unsigned " << ClassName
o << "static unsigned " << ClassName
<< "getBinaryCodeForInstr(MachineInstr &MI) {\n"
<< " unsigned Value = 0;\n"
<< " std::cerr << MI;\n"
<< " switch (MI.getOpcode()) {\n";
for (std::vector<Record*>::iterator I = Insts.begin(), E = Insts.end();
I != E; ++I)
@ -38,18 +39,25 @@ void CodeEmitterGen::createEmitter(std::ostream &o) {
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(i)))
Value |= B->getValue() << i;
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\n";
o << " Value = " << Value << "U;\n";
o << " // " << *InstVal << "\n";
o << " // " << *InstVal << "\n\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 Offset = 31, opNum=0;
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" &&
@ -58,11 +66,15 @@ void CodeEmitterGen::createEmitter(std::ostream &o) {
Vals[i].getName() != "cc" &&
Vals[i].getName() != "predict")
{
o << " // " << opNum << ": " << Vals[i].getName() << "\n";
OpOrder[Vals[i].getName()] = opNum++;
o << " // op" << op << ": " << Vals[i].getName() << "\n"
<< " int64_t op" << op
<<" = getMachineOpValue(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();
@ -70,7 +82,6 @@ void CodeEmitterGen::createEmitter(std::ostream &o) {
// 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 =
@ -80,26 +91,32 @@ void CodeEmitterGen::createEmitter(std::ostream &o) {
dynamic_cast<VarBitInit*>(FieldInitializer->getBit(i))) {
TypedInit *TI = VBI->getVariable();
if (VarInit *VI = dynamic_cast<VarInit*>(TI)) {
o << " Value |= getValueBit(MI.getOperand("
<< OpOrder[VI->getName()]
<< "), " << VBI->getBitNum()
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 << "something else\n";
o << "Error: UNIMPLEMENTED\n";
}
}
}
}
} else {
if (Vals[f].getName() == "annul" || Vals[f].getName() == "cc" ||
Vals[f].getName() == "predict")
--Offset;
}
}
o << " break;\n"
<< " }\n";
}
o << " }\n"
o << " default:\n"
<< " std::cerr << \"Not supported instr: \" << MI << \"\\n\";\n"
<< " abort();\n"
<< " }\n"
<< " return Value;\n"
<< "}\n";
}