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//===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting descriptions of the calling
// conventions supported by this target.
//
//===----------------------------------------------------------------------===//
#include "CodeGenTarget.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <cassert>
using namespace llvm;
namespace {
class CallingConvEmitter {
RecordKeeper &Records;
public:
explicit CallingConvEmitter(RecordKeeper &R) : Records(R) {}
void run(raw_ostream &o);
private:
void EmitCallingConv(Record *CC, raw_ostream &O);
void EmitAction(Record *Action, unsigned Indent, raw_ostream &O);
unsigned Counter;
};
} // End anonymous namespace
void CallingConvEmitter::run(raw_ostream &O) {
std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
// Emit prototypes for all of the non-custom CC's so that they can forward ref
// each other.
Records.startTimer("Emit prototypes");
for (Record *CC : CCs) {
if (!CC->getValueAsBit("Custom")) {
unsigned Pad = CC->getName().size();
if (CC->getValueAsBit("Entry")) {
O << "bool llvm::";
Pad += 12;
} else {
O << "static bool ";
Pad += 13;
}
O << CC->getName() << "(unsigned ValNo, MVT ValVT,\n"
<< std::string(Pad, ' ') << "MVT LocVT, CCValAssign::LocInfo LocInfo,\n"
<< std::string(Pad, ' ')
<< "ISD::ArgFlagsTy ArgFlags, CCState &State);\n";
}
}
// Emit each non-custom calling convention description in full.
Records.startTimer("Emit full descriptions");
for (Record *CC : CCs) {
if (!CC->getValueAsBit("Custom"))
EmitCallingConv(CC, O);
}
}
void CallingConvEmitter::EmitCallingConv(Record *CC, raw_ostream &O) {
ListInit *CCActions = CC->getValueAsListInit("Actions");
Counter = 0;
O << "\n\n";
unsigned Pad = CC->getName().size();
if (CC->getValueAsBit("Entry")) {
O << "bool llvm::";
Pad += 12;
} else {
O << "static bool ";
Pad += 13;
}
O << CC->getName() << "(unsigned ValNo, MVT ValVT,\n"
<< std::string(Pad, ' ') << "MVT LocVT, CCValAssign::LocInfo LocInfo,\n"
<< std::string(Pad, ' ') << "ISD::ArgFlagsTy ArgFlags, CCState &State) {\n";
// Emit all of the actions, in order.
for (unsigned i = 0, e = CCActions->size(); 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, raw_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->size(); 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 {
errs() << *Action;
PrintFatalError(Action->getLoc(), "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->size() == 1) {
O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
} else {
O << IndentStr << "static const MCPhysReg RegList" << ++Counter
<< "[] = {\n";
O << IndentStr << " ";
ListSeparator LS;
for (unsigned i = 0, e = RegList->size(); i != e; ++i)
O << LS << getQualifiedName(RegList->getElementAsRecord(i));
O << "\n" << IndentStr << "};\n";
O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
<< Counter << ")) {\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("CCAssignToRegWithShadow")) {
ListInit *RegList = Action->getValueAsListInit("RegList");
ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
if (!ShadowRegList->empty() && ShadowRegList->size() != RegList->size())
PrintFatalError(Action->getLoc(),
"Invalid length of list of shadowed registers");
if (RegList->size() == 1) {
O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
O << getQualifiedName(RegList->getElementAsRecord(0));
O << ", " << getQualifiedName(ShadowRegList->getElementAsRecord(0));
O << ")) {\n";
} else {
unsigned RegListNumber = ++Counter;
unsigned ShadowRegListNumber = ++Counter;
O << IndentStr << "static const MCPhysReg RegList" << RegListNumber
<< "[] = {\n";
O << IndentStr << " ";
ListSeparator LS;
for (unsigned i = 0, e = RegList->size(); i != e; ++i)
O << LS << getQualifiedName(RegList->getElementAsRecord(i));
O << "\n" << IndentStr << "};\n";
O << IndentStr << "static const MCPhysReg RegList"
<< ShadowRegListNumber << "[] = {\n";
O << IndentStr << " ";
ListSeparator LSS;
for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i)
O << LSS << getQualifiedName(ShadowRegList->getElementAsRecord(i));
O << "\n" << IndentStr << "};\n";
O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
<< RegListNumber << ", " << "RegList" << ShadowRegListNumber
<< ")) {\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.getMachineFunction().getDataLayout()."
"getTypeAllocSize(EVT(LocVT).getTypeForEVT(State.getContext())),"
" ";
if (Align)
O << "Align(" << Align << ")";
else
O << "\n"
<< IndentStr
<< " State.getMachineFunction().getDataLayout()."
"getABITypeAlign(EVT(LocVT).getTypeForEVT(State.getContext()"
"))";
O << ");\n" << IndentStr
<< "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
<< Counter << ", LocVT, LocInfo));\n";
O << IndentStr << "return false;\n";
} else if (Action->isSubClassOf("CCAssignToStackWithShadow")) {
int Size = Action->getValueAsInt("Size");
int Align = Action->getValueAsInt("Align");
ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
unsigned ShadowRegListNumber = ++Counter;
O << IndentStr << "static const MCPhysReg ShadowRegList"
<< ShadowRegListNumber << "[] = {\n";
O << IndentStr << " ";
ListSeparator LS;
for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i)
O << LS << getQualifiedName(ShadowRegList->getElementAsRecord(i));
O << "\n" << IndentStr << "};\n";
O << IndentStr << "unsigned Offset" << ++Counter
<< " = State.AllocateStack(" << Size << ", Align(" << Align << "), "
<< "ShadowRegList" << ShadowRegListNumber << ");\n";
O << 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");
MVT::SimpleValueType DestVT = getValueType(DestTy);
O << IndentStr << "LocVT = " << getEnumName(DestVT) <<";\n";
if (MVT(DestVT).isFloatingPoint()) {
O << IndentStr << "LocInfo = CCValAssign::FPExt;\n";
} else {
O << IndentStr << "if (ArgFlags.isSExt())\n"
<< IndentStr << " LocInfo = CCValAssign::SExt;\n"
<< IndentStr << "else if (ArgFlags.isZExt())\n"
<< IndentStr << " LocInfo = CCValAssign::ZExt;\n"
<< IndentStr << "else\n"
<< IndentStr << " LocInfo = CCValAssign::AExt;\n";
}
} else if (Action->isSubClassOf("CCPromoteToUpperBitsInType")) {
Record *DestTy = Action->getValueAsDef("DestTy");
MVT::SimpleValueType DestVT = getValueType(DestTy);
O << IndentStr << "LocVT = " << getEnumName(DestVT) << ";\n";
if (MVT(DestVT).isFloatingPoint()) {
PrintFatalError(Action->getLoc(),
"CCPromoteToUpperBitsInType does not handle floating "
"point");
} else {
O << IndentStr << "if (ArgFlags.isSExt())\n"
<< IndentStr << " LocInfo = CCValAssign::SExtUpper;\n"
<< IndentStr << "else if (ArgFlags.isZExt())\n"
<< IndentStr << " LocInfo = CCValAssign::ZExtUpper;\n"
<< IndentStr << "else\n"
<< IndentStr << " LocInfo = CCValAssign::AExtUpper;\n";
}
} else if (Action->isSubClassOf("CCBitConvertToType")) {
Record *DestTy = Action->getValueAsDef("DestTy");
O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
O << IndentStr << "LocInfo = CCValAssign::BCvt;\n";
} else if (Action->isSubClassOf("CCTruncToType")) {
Record *DestTy = Action->getValueAsDef("DestTy");
O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
O << IndentStr << "LocInfo = CCValAssign::Trunc;\n";
} else if (Action->isSubClassOf("CCPassIndirect")) {
Record *DestTy = Action->getValueAsDef("DestTy");
O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
O << IndentStr << "LocInfo = CCValAssign::Indirect;\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(" << Align << "), ArgFlags);\n";
O << IndentStr << "return false;\n";
} else if (Action->isSubClassOf("CCCustom")) {
O << IndentStr
<< "if (" << Action->getValueAsString("FuncName") << "(ValNo, ValVT, "
<< "LocVT, LocInfo, ArgFlags, State))\n";
O << IndentStr << " return false;\n";
} else {
errs() << *Action;
PrintFatalError(Action->getLoc(), "Unknown CCAction!");
}
}
}
namespace llvm {
void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS) {
emitSourceFileHeader("Calling Convention Implementation Fragment", OS);
CallingConvEmitter(RK).run(OS);
}
} // End llvm namespace
|
