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//===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting descriptions of the calling
// conventions supported by this target.
//
//===----------------------------------------------------------------------===//
#include "CallingConvEmitter.h"
#include "Record.h"
#include "CodeGenTarget.h"
using namespace llvm;
void CallingConvEmitter::run(std::ostream &O) {
EmitSourceFileHeader("Calling Convention Implementation Fragment", O);
std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
// Emit prototypes for all of the CC's so that they can forward ref each
// other.
for (unsigned i = 0, e = CCs.size(); i != e; ++i) {
O << "static bool " << CCs[i]->getName()
<< "(unsigned ValNo, MVT::ValueType ValVT,\n"
<< std::string(CCs[i]->getName().size()+13, ' ')
<< "MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,\n"
<< std::string(CCs[i]->getName().size()+13, ' ')
<< "ISD::ParamFlags::ParamFlagsTy ArgFlags, CCState &State);\n";
}
// Emit each calling convention description in full.
for (unsigned i = 0, e = CCs.size(); i != e; ++i)
EmitCallingConv(CCs[i], O);
}
void CallingConvEmitter::EmitCallingConv(Record *CC, std::ostream &O) {
ListInit *CCActions = CC->getValueAsListInit("Actions");
Counter = 0;
O << "\n\nstatic bool " << CC->getName()
<< "(unsigned ValNo, MVT::ValueType ValVT,\n"
<< std::string(CC->getName().size()+13, ' ')
<< "MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,\n"
<< std::string(CC->getName().size()+13, ' ')
<< "ISD::ParamFlags::ParamFlagsTy ArgFlags, CCState &State) {\n";
// Emit all of the actions, in order.
for (unsigned i = 0, e = CCActions->getSize(); i != e; ++i) {
O << "\n";
EmitAction(CCActions->getElementAsRecord(i), 2, O);
}
O << "\n return true; // CC didn't match.\n";
O << "}\n";
}
void CallingConvEmitter::EmitAction(Record *Action,
unsigned Indent, std::ostream &O) {
std::string IndentStr = std::string(Indent, ' ');
if (Action->isSubClassOf("CCPredicateAction")) {
O << IndentStr << "if (";
if (Action->isSubClassOf("CCIfType")) {
ListInit *VTs = Action->getValueAsListInit("VTs");
for (unsigned i = 0, e = VTs->getSize(); i != e; ++i) {
Record *VT = VTs->getElementAsRecord(i);
if (i != 0) O << " ||\n " << IndentStr;
O << "LocVT == " << getEnumName(getValueType(VT));
}
} else if (Action->isSubClassOf("CCIf")) {
O << Action->getValueAsString("Predicate");
} else {
Action->dump();
throw "Unknown CCPredicateAction!";
}
O << ") {\n";
EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O);
O << IndentStr << "}\n";
} else {
if (Action->isSubClassOf("CCDelegateTo")) {
Record *CC = Action->getValueAsDef("CC");
O << IndentStr << "if (!" << CC->getName()
<< "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n"
<< IndentStr << " return false;\n";
} else if (Action->isSubClassOf("CCAssignToReg")) {
ListInit *RegList = Action->getValueAsListInit("RegList");
if (RegList->getSize() == 1) {
O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
} else {
O << IndentStr << "static const unsigned RegList" << ++Counter
<< "[] = {\n";
O << IndentStr << " ";
for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
if (i != 0) O << ", ";
O << getQualifiedName(RegList->getElementAsRecord(i));
}
O << "\n" << IndentStr << "};\n";
O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
<< Counter << ", " << RegList->getSize() << ")) {\n";
}
O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
<< "Reg, LocVT, LocInfo));\n";
O << IndentStr << " return false;\n";
O << IndentStr << "}\n";
} else if (Action->isSubClassOf("CCAssignToStack")) {
int Size = Action->getValueAsInt("Size");
int Align = Action->getValueAsInt("Align");
O << IndentStr << "unsigned Offset" << ++Counter
<< " = State.AllocateStack(";
if (Size)
O << Size << ", ";
else
O << "\n" << IndentStr << " State.getTarget().getTargetData()"
"->getABITypeSize(MVT::getTypeForValueType(LocVT)), ";
if (Align)
O << Align;
else
O << "\n" << IndentStr << " State.getTarget().getTargetData()"
"->getABITypeAlignment(MVT::getTypeForValueType(LocVT))";
O << ");\n" << IndentStr
<< "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
<< Counter << ", LocVT, LocInfo));\n";
O << IndentStr << "return false;\n";
} else if (Action->isSubClassOf("CCPromoteToType")) {
Record *DestTy = Action->getValueAsDef("DestTy");
O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
O << IndentStr << "if (ArgFlags & ISD::ParamFlags::SExt)\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
<< IndentStr << "else if (ArgFlags & ISD::ParamFlags::ZExt)\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
<< IndentStr << "else\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
} else if (Action->isSubClassOf("CCPassByVal")) {
int Size = Action->getValueAsInt("Size");
int Align = Action->getValueAsInt("Align");
O << IndentStr
<< "State.HandleByVal(ValNo, ValVT, LocVT, LocInfo, "
<< Size << ", " << Align << ", ArgFlags);\n";
O << IndentStr << "return false;\n";
} else {
Action->dump();
throw "Unknown CCAction!";
}
}
}
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