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799d697bf8
set, these flags indicate the instructions source / def operands have special register allocation requirement that are not captured in their register classes. Post-allocation passes (e.g. post-alloc scheduler) should not change their allocations. e.g. ARM::LDRD require the two definitions to be allocated even / odd register pair. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83196 91177308-0d34-0410-b5e6-96231b3b80d8
276 lines
10 KiB
C++
276 lines
10 KiB
C++
//===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===//
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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 file implements the CodeGenInstruction class.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenInstruction.h"
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#include "Record.h"
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#include "llvm/ADT/StringExtras.h"
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#include <set>
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using namespace llvm;
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static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
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// FIXME: Only supports TIED_TO for now.
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std::string::size_type pos = CStr.find_first_of('=');
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assert(pos != std::string::npos && "Unrecognized constraint");
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std::string::size_type start = CStr.find_first_not_of(" \t");
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std::string Name = CStr.substr(start, pos - start);
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// TIED_TO: $src1 = $dst
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std::string::size_type wpos = Name.find_first_of(" \t");
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if (wpos == std::string::npos)
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throw "Illegal format for tied-to constraint: '" + CStr + "'";
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std::string DestOpName = Name.substr(0, wpos);
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std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false);
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Name = CStr.substr(pos+1);
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wpos = Name.find_first_not_of(" \t");
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if (wpos == std::string::npos)
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throw "Illegal format for tied-to constraint: '" + CStr + "'";
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std::pair<unsigned,unsigned> SrcOp =
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I->ParseOperandName(Name.substr(wpos), false);
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if (SrcOp > DestOp)
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throw "Illegal tied-to operand constraint '" + CStr + "'";
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unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp);
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// Build the string for the operand.
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std::string OpConstraint =
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"((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
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if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
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throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
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I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;
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}
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static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) {
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// Make sure the constraints list for each operand is large enough to hold
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// constraint info, even if none is present.
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for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i)
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I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands);
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if (CStr.empty()) return;
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const std::string delims(",");
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std::string::size_type bidx, eidx;
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bidx = CStr.find_first_not_of(delims);
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while (bidx != std::string::npos) {
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eidx = CStr.find_first_of(delims, bidx);
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if (eidx == std::string::npos)
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eidx = CStr.length();
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ParseConstraint(CStr.substr(bidx, eidx - bidx), I);
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bidx = CStr.find_first_not_of(delims, eidx);
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}
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}
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CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
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: TheDef(R), AsmString(AsmStr) {
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Namespace = R->getValueAsString("Namespace");
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isReturn = R->getValueAsBit("isReturn");
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isBranch = R->getValueAsBit("isBranch");
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isIndirectBranch = R->getValueAsBit("isIndirectBranch");
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isBarrier = R->getValueAsBit("isBarrier");
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isCall = R->getValueAsBit("isCall");
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canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
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mayLoad = R->getValueAsBit("mayLoad");
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mayStore = R->getValueAsBit("mayStore");
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bool isTwoAddress = R->getValueAsBit("isTwoAddress");
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isPredicable = R->getValueAsBit("isPredicable");
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isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
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isCommutable = R->getValueAsBit("isCommutable");
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isTerminator = R->getValueAsBit("isTerminator");
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isReMaterializable = R->getValueAsBit("isReMaterializable");
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hasDelaySlot = R->getValueAsBit("hasDelaySlot");
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usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter");
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hasCtrlDep = R->getValueAsBit("hasCtrlDep");
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isNotDuplicable = R->getValueAsBit("isNotDuplicable");
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hasSideEffects = R->getValueAsBit("hasSideEffects");
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mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
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neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
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isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
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hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
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hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
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hasOptionalDef = false;
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isVariadic = false;
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if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1)
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throw R->getName() + ": multiple conflicting side-effect flags set!";
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DagInit *DI;
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try {
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DI = R->getValueAsDag("OutOperandList");
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} catch (...) {
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// Error getting operand list, just ignore it (sparcv9).
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AsmString.clear();
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OperandList.clear();
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return;
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}
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NumDefs = DI->getNumArgs();
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DagInit *IDI;
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try {
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IDI = R->getValueAsDag("InOperandList");
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} catch (...) {
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// Error getting operand list, just ignore it (sparcv9).
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AsmString.clear();
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OperandList.clear();
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return;
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}
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DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI, new DagRecTy))->Fold(R, 0);
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unsigned MIOperandNo = 0;
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std::set<std::string> OperandNames;
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for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) {
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DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i));
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if (!Arg)
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throw "Illegal operand for the '" + R->getName() + "' instruction!";
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Record *Rec = Arg->getDef();
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std::string PrintMethod = "printOperand";
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unsigned NumOps = 1;
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DagInit *MIOpInfo = 0;
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if (Rec->isSubClassOf("Operand")) {
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PrintMethod = Rec->getValueAsString("PrintMethod");
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MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
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// Verify that MIOpInfo has an 'ops' root value.
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if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
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dynamic_cast<DefInit*>(MIOpInfo->getOperator())
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->getDef()->getName() != "ops")
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throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
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"'\n";
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// If we have MIOpInfo, then we have #operands equal to number of entries
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// in MIOperandInfo.
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if (unsigned NumArgs = MIOpInfo->getNumArgs())
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NumOps = NumArgs;
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if (Rec->isSubClassOf("PredicateOperand"))
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isPredicable = true;
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else if (Rec->isSubClassOf("OptionalDefOperand"))
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hasOptionalDef = true;
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} else if (Rec->getName() == "variable_ops") {
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isVariadic = true;
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continue;
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} else if (!Rec->isSubClassOf("RegisterClass") &&
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Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
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throw "Unknown operand class '" + Rec->getName() +
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"' in '" + R->getName() + "' instruction!";
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// Check that the operand has a name and that it's unique.
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if (DI->getArgName(i).empty())
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throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
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" has no name!";
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if (!OperandNames.insert(DI->getArgName(i)).second)
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throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
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" has the same name as a previous operand!";
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OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod,
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MIOperandNo, NumOps, MIOpInfo));
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MIOperandNo += NumOps;
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}
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// Parse Constraints.
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ParseConstraints(R->getValueAsString("Constraints"), this);
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// For backward compatibility: isTwoAddress means operand 1 is tied to
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// operand 0.
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if (isTwoAddress) {
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if (!OperandList[1].Constraints[0].empty())
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throw R->getName() + ": cannot use isTwoAddress property: instruction "
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"already has constraint set!";
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OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))";
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}
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// Any operands with unset constraints get 0 as their constraint.
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for (unsigned op = 0, e = OperandList.size(); op != e; ++op)
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for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
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if (OperandList[op].Constraints[j].empty())
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OperandList[op].Constraints[j] = "0";
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// Parse the DisableEncoding field.
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std::string DisableEncoding = R->getValueAsString("DisableEncoding");
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while (1) {
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std::string OpName = getToken(DisableEncoding, " ,\t");
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if (OpName.empty()) break;
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// Figure out which operand this is.
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std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
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// Mark the operand as not-to-be encoded.
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if (Op.second >= OperandList[Op.first].DoNotEncode.size())
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OperandList[Op.first].DoNotEncode.resize(Op.second+1);
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OperandList[Op.first].DoNotEncode[Op.second] = true;
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}
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}
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/// getOperandNamed - Return the index of the operand with the specified
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/// non-empty name. If the instruction does not have an operand with the
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/// specified name, throw an exception.
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///
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unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
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assert(!Name.empty() && "Cannot search for operand with no name!");
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for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
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if (OperandList[i].Name == Name) return i;
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throw "Instruction '" + TheDef->getName() +
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"' does not have an operand named '$" + Name + "'!";
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}
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std::pair<unsigned,unsigned>
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CodeGenInstruction::ParseOperandName(const std::string &Op,
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bool AllowWholeOp) {
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if (Op.empty() || Op[0] != '$')
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throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
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std::string OpName = Op.substr(1);
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std::string SubOpName;
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// Check to see if this is $foo.bar.
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std::string::size_type DotIdx = OpName.find_first_of(".");
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if (DotIdx != std::string::npos) {
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SubOpName = OpName.substr(DotIdx+1);
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if (SubOpName.empty())
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throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
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OpName = OpName.substr(0, DotIdx);
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}
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unsigned OpIdx = getOperandNamed(OpName);
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if (SubOpName.empty()) { // If no suboperand name was specified:
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// If one was needed, throw.
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if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
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SubOpName.empty())
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throw TheDef->getName() + ": Illegal to refer to"
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" whole operand part of complex operand '" + Op + "'";
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// Otherwise, return the operand.
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return std::make_pair(OpIdx, 0U);
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}
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// Find the suboperand number involved.
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DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
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if (MIOpInfo == 0)
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throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
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// Find the operand with the right name.
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for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
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if (MIOpInfo->getArgName(i) == SubOpName)
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return std::make_pair(OpIdx, i);
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// Otherwise, didn't find it!
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throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
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}
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