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llvm-project/llvm/utils/TableGen/CallingConvEmitter.cpp
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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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.
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.
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("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 << " ";
for (unsigned i = 0, e = RegList->size(); 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 << ")) {\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("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 << " ";
for (unsigned i = 0, e = RegList->size(); i != e; ++i) {
if (i != 0) O << ", ";
O << getQualifiedName(RegList->getElementAsRecord(i));
}
O << "\n" << IndentStr << "};\n";
O << IndentStr << "static const MCPhysReg RegList"
<< ShadowRegListNumber << "[] = {\n";
O << IndentStr << " ";
for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) {
if (i != 0) O << ", ";
O << 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;
else
O << "\n" << IndentStr
<< " State.getMachineFunction().getDataLayout()."
"getABITypeAlignment(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 << " ";
for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) {
if (i != 0) O << ", ";
O << getQualifiedName(ShadowRegList->getElementAsRecord(i));
}
O << "\n" << IndentStr << "};\n";
O << IndentStr << "unsigned Offset" << ++Counter
<< " = State.AllocateStack("
<< Size << ", " << 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 << IndentStr << "LocInfo = CCValAssign::SExt;\n"
<< IndentStr << "else if (ArgFlags.isZExt())\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
<< IndentStr << "else\n"
<< IndentStr << 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("CCPromoteToUpperBitsInType does not handle floating "
"point");
} else {
O << IndentStr << "if (ArgFlags.isSExt())\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::SExtUpper;\n"
<< IndentStr << "else if (ArgFlags.isZExt())\n"
<< IndentStr << IndentStr << "LocInfo = CCValAssign::ZExtUpper;\n"
<< IndentStr << "else\n"
<< IndentStr << 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("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 << ", 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 << IndentStr << "return false;\n";
} else {
errs() << *Action;
PrintFatalError("Unknown CCAction!");
}
}
}
namespace llvm {
void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS) {
emitSourceFileHeader("Calling Convention Implementation Fragment", OS);
CallingConvEmitter(RK).run(OS);
}
} // End llvm namespace
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