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external/llvm/utils/TableGen/CallingConvEmitter.cpp
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284
external/llvm/utils/TableGen/CallingConvEmitter.cpp
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//===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend is responsible for emitting descriptions of the calling
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// conventions supported by this target.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenTarget.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/Record.h"
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#include "llvm/TableGen/TableGenBackend.h"
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#include <cassert>
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using namespace llvm;
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namespace {
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class CallingConvEmitter {
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RecordKeeper &Records;
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public:
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explicit CallingConvEmitter(RecordKeeper &R) : Records(R) {}
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void run(raw_ostream &o);
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private:
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void EmitCallingConv(Record *CC, raw_ostream &O);
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void EmitAction(Record *Action, unsigned Indent, raw_ostream &O);
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unsigned Counter;
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};
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} // End anonymous namespace
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void CallingConvEmitter::run(raw_ostream &O) {
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std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
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// Emit prototypes for all of the non-custom CC's so that they can forward ref
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// each other.
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for (Record *CC : CCs) {
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if (!CC->getValueAsBit("Custom")) {
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O << "static bool " << CC->getName()
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<< "(unsigned ValNo, MVT ValVT,\n"
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<< std::string(CC->getName().size() + 13, ' ')
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<< "MVT LocVT, CCValAssign::LocInfo LocInfo,\n"
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<< std::string(CC->getName().size() + 13, ' ')
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<< "ISD::ArgFlagsTy ArgFlags, CCState &State);\n";
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}
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}
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// Emit each non-custom calling convention description in full.
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for (Record *CC : CCs) {
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if (!CC->getValueAsBit("Custom"))
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EmitCallingConv(CC, O);
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}
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}
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void CallingConvEmitter::EmitCallingConv(Record *CC, raw_ostream &O) {
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ListInit *CCActions = CC->getValueAsListInit("Actions");
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Counter = 0;
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O << "\n\nstatic bool " << CC->getName()
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<< "(unsigned ValNo, MVT ValVT,\n"
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<< std::string(CC->getName().size()+13, ' ')
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<< "MVT LocVT, CCValAssign::LocInfo LocInfo,\n"
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<< std::string(CC->getName().size()+13, ' ')
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<< "ISD::ArgFlagsTy ArgFlags, CCState &State) {\n";
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// Emit all of the actions, in order.
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for (unsigned i = 0, e = CCActions->size(); i != e; ++i) {
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O << "\n";
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EmitAction(CCActions->getElementAsRecord(i), 2, O);
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}
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O << "\n return true; // CC didn't match.\n";
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O << "}\n";
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}
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void CallingConvEmitter::EmitAction(Record *Action,
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unsigned Indent, raw_ostream &O) {
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std::string IndentStr = std::string(Indent, ' ');
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if (Action->isSubClassOf("CCPredicateAction")) {
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O << IndentStr << "if (";
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if (Action->isSubClassOf("CCIfType")) {
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ListInit *VTs = Action->getValueAsListInit("VTs");
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for (unsigned i = 0, e = VTs->size(); i != e; ++i) {
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Record *VT = VTs->getElementAsRecord(i);
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if (i != 0) O << " ||\n " << IndentStr;
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O << "LocVT == " << getEnumName(getValueType(VT));
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}
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} else if (Action->isSubClassOf("CCIf")) {
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O << Action->getValueAsString("Predicate");
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} else {
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errs() << *Action;
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PrintFatalError("Unknown CCPredicateAction!");
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}
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O << ") {\n";
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EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O);
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O << IndentStr << "}\n";
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} else {
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if (Action->isSubClassOf("CCDelegateTo")) {
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Record *CC = Action->getValueAsDef("CC");
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O << IndentStr << "if (!" << CC->getName()
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<< "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n"
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<< IndentStr << " return false;\n";
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} else if (Action->isSubClassOf("CCAssignToReg")) {
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ListInit *RegList = Action->getValueAsListInit("RegList");
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if (RegList->size() == 1) {
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O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
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O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
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} else {
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O << IndentStr << "static const MCPhysReg RegList" << ++Counter
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<< "[] = {\n";
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O << IndentStr << " ";
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for (unsigned i = 0, e = RegList->size(); i != e; ++i) {
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if (i != 0) O << ", ";
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O << getQualifiedName(RegList->getElementAsRecord(i));
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}
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O << "\n" << IndentStr << "};\n";
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O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
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<< Counter << ")) {\n";
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}
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O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
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<< "Reg, LocVT, LocInfo));\n";
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O << IndentStr << " return false;\n";
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O << IndentStr << "}\n";
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} else if (Action->isSubClassOf("CCAssignToRegWithShadow")) {
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ListInit *RegList = Action->getValueAsListInit("RegList");
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ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
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if (!ShadowRegList->empty() && ShadowRegList->size() != RegList->size())
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PrintFatalError("Invalid length of list of shadowed registers");
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if (RegList->size() == 1) {
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O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
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O << getQualifiedName(RegList->getElementAsRecord(0));
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O << ", " << getQualifiedName(ShadowRegList->getElementAsRecord(0));
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O << ")) {\n";
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} else {
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unsigned RegListNumber = ++Counter;
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unsigned ShadowRegListNumber = ++Counter;
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O << IndentStr << "static const MCPhysReg RegList" << RegListNumber
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<< "[] = {\n";
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O << IndentStr << " ";
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for (unsigned i = 0, e = RegList->size(); i != e; ++i) {
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if (i != 0) O << ", ";
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O << getQualifiedName(RegList->getElementAsRecord(i));
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}
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O << "\n" << IndentStr << "};\n";
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O << IndentStr << "static const MCPhysReg RegList"
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<< ShadowRegListNumber << "[] = {\n";
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O << IndentStr << " ";
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for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) {
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if (i != 0) O << ", ";
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O << getQualifiedName(ShadowRegList->getElementAsRecord(i));
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}
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O << "\n" << IndentStr << "};\n";
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O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
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<< RegListNumber << ", " << "RegList" << ShadowRegListNumber
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<< ")) {\n";
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}
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O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
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<< "Reg, LocVT, LocInfo));\n";
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O << IndentStr << " return false;\n";
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O << IndentStr << "}\n";
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} else if (Action->isSubClassOf("CCAssignToStack")) {
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int Size = Action->getValueAsInt("Size");
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int Align = Action->getValueAsInt("Align");
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O << IndentStr << "unsigned Offset" << ++Counter
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<< " = State.AllocateStack(";
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if (Size)
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O << Size << ", ";
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else
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O << "\n" << IndentStr
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<< " State.getMachineFunction().getDataLayout()."
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"getTypeAllocSize(EVT(LocVT).getTypeForEVT(State.getContext())),"
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" ";
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if (Align)
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O << Align;
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else
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O << "\n" << IndentStr
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<< " State.getMachineFunction().getDataLayout()."
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"getABITypeAlignment(EVT(LocVT).getTypeForEVT(State.getContext()"
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"))";
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O << ");\n" << IndentStr
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<< "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
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<< Counter << ", LocVT, LocInfo));\n";
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O << IndentStr << "return false;\n";
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} else if (Action->isSubClassOf("CCAssignToStackWithShadow")) {
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int Size = Action->getValueAsInt("Size");
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int Align = Action->getValueAsInt("Align");
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ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
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unsigned ShadowRegListNumber = ++Counter;
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O << IndentStr << "static const MCPhysReg ShadowRegList"
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<< ShadowRegListNumber << "[] = {\n";
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O << IndentStr << " ";
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for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) {
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if (i != 0) O << ", ";
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O << getQualifiedName(ShadowRegList->getElementAsRecord(i));
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}
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O << "\n" << IndentStr << "};\n";
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O << IndentStr << "unsigned Offset" << ++Counter
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<< " = State.AllocateStack("
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<< Size << ", " << Align << ", "
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<< "ShadowRegList" << ShadowRegListNumber << ");\n";
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O << IndentStr << "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
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<< Counter << ", LocVT, LocInfo));\n";
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O << IndentStr << "return false;\n";
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} else if (Action->isSubClassOf("CCPromoteToType")) {
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Record *DestTy = Action->getValueAsDef("DestTy");
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MVT::SimpleValueType DestVT = getValueType(DestTy);
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O << IndentStr << "LocVT = " << getEnumName(DestVT) <<";\n";
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if (MVT(DestVT).isFloatingPoint()) {
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O << IndentStr << "LocInfo = CCValAssign::FPExt;\n";
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} else {
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O << IndentStr << "if (ArgFlags.isSExt())\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
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<< IndentStr << "else if (ArgFlags.isZExt())\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
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<< IndentStr << "else\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
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}
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} else if (Action->isSubClassOf("CCPromoteToUpperBitsInType")) {
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Record *DestTy = Action->getValueAsDef("DestTy");
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MVT::SimpleValueType DestVT = getValueType(DestTy);
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O << IndentStr << "LocVT = " << getEnumName(DestVT) << ";\n";
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if (MVT(DestVT).isFloatingPoint()) {
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PrintFatalError("CCPromoteToUpperBitsInType does not handle floating "
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"point");
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} else {
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O << IndentStr << "if (ArgFlags.isSExt())\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::SExtUpper;\n"
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<< IndentStr << "else if (ArgFlags.isZExt())\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::ZExtUpper;\n"
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<< IndentStr << "else\n"
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<< IndentStr << IndentStr << "LocInfo = CCValAssign::AExtUpper;\n";
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}
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} else if (Action->isSubClassOf("CCBitConvertToType")) {
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Record *DestTy = Action->getValueAsDef("DestTy");
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O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
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O << IndentStr << "LocInfo = CCValAssign::BCvt;\n";
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} else if (Action->isSubClassOf("CCPassIndirect")) {
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Record *DestTy = Action->getValueAsDef("DestTy");
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O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
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O << IndentStr << "LocInfo = CCValAssign::Indirect;\n";
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} else if (Action->isSubClassOf("CCPassByVal")) {
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int Size = Action->getValueAsInt("Size");
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int Align = Action->getValueAsInt("Align");
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O << IndentStr
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<< "State.HandleByVal(ValNo, ValVT, LocVT, LocInfo, "
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<< Size << ", " << Align << ", ArgFlags);\n";
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O << IndentStr << "return false;\n";
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} else if (Action->isSubClassOf("CCCustom")) {
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O << IndentStr
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<< "if (" << Action->getValueAsString("FuncName") << "(ValNo, ValVT, "
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<< "LocVT, LocInfo, ArgFlags, State))\n";
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O << IndentStr << IndentStr << "return false;\n";
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} else {
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errs() << *Action;
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PrintFatalError("Unknown CCAction!");
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}
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}
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}
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namespace llvm {
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void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS) {
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emitSourceFileHeader("Calling Convention Implementation Fragment", OS);
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CallingConvEmitter(RK).run(OS);
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}
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} // End llvm namespace
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