1 //===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the CodeGenInstruction class.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenInstruction.h"
16 #include "llvm/ADT/StringExtras.h"
20 static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
21 // FIXME: Only supports TIED_TO for now.
22 std::string::size_type pos = CStr.find_first_of('=');
23 assert(pos != std::string::npos && "Unrecognized constraint");
24 std::string Name = CStr.substr(0, pos);
26 // TIED_TO: $src1 = $dst
27 std::string::size_type wpos = Name.find_first_of(" \t");
28 if (wpos == std::string::npos)
29 throw "Illegal format for tied-to constraint: '" + CStr + "'";
30 std::string DestOpName = Name.substr(0, wpos);
31 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false);
33 Name = CStr.substr(pos+1);
34 wpos = Name.find_first_not_of(" \t");
35 if (wpos == std::string::npos)
36 throw "Illegal format for tied-to constraint: '" + CStr + "'";
38 std::pair<unsigned,unsigned> SrcOp =
39 I->ParseOperandName(Name.substr(wpos), false);
41 throw "Illegal tied-to operand constraint '" + CStr + "'";
44 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp);
45 // Build the string for the operand.
46 std::string OpConstraint =
47 "((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
50 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
51 throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
52 I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;
55 static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) {
56 // Make sure the constraints list for each operand is large enough to hold
57 // constraint info, even if none is present.
58 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i)
59 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands);
61 if (CStr.empty()) return;
63 const std::string delims(",");
64 std::string::size_type bidx, eidx;
66 bidx = CStr.find_first_not_of(delims);
67 while (bidx != std::string::npos) {
68 eidx = CStr.find_first_of(delims, bidx);
69 if (eidx == std::string::npos)
72 ParseConstraint(CStr.substr(bidx, eidx), I);
73 bidx = CStr.find_first_not_of(delims, eidx);
77 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
78 : TheDef(R), AsmString(AsmStr) {
79 Namespace = R->getValueAsString("Namespace");
81 isReturn = R->getValueAsBit("isReturn");
82 isBranch = R->getValueAsBit("isBranch");
83 isIndirectBranch = R->getValueAsBit("isIndirectBranch");
84 isBarrier = R->getValueAsBit("isBarrier");
85 isCall = R->getValueAsBit("isCall");
86 isSimpleLoad = R->getValueAsBit("isSimpleLoad");
87 mayLoad = R->getValueAsBit("mayLoad");
88 mayStore = R->getValueAsBit("mayStore");
89 bool isTwoAddress = R->getValueAsBit("isTwoAddress");
90 isPredicable = R->getValueAsBit("isPredicable");
91 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
92 isCommutable = R->getValueAsBit("isCommutable");
93 isTerminator = R->getValueAsBit("isTerminator");
94 isReMaterializable = R->getValueAsBit("isReMaterializable");
95 hasDelaySlot = R->getValueAsBit("hasDelaySlot");
96 usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter");
97 hasCtrlDep = R->getValueAsBit("hasCtrlDep");
98 isNotDuplicable = R->getValueAsBit("isNotDuplicable");
99 hasSideEffects = R->getValueAsBit("hasSideEffects");
100 mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
101 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
102 hasOptionalDef = false;
105 if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1)
106 throw R->getName() + ": multiple conflicting side-effect flags set!";
110 DI = R->getValueAsDag("OutOperandList");
112 // Error getting operand list, just ignore it (sparcv9).
117 NumDefs = DI->getNumArgs();
121 IDI = R->getValueAsDag("InOperandList");
123 // Error getting operand list, just ignore it (sparcv9).
128 DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI))->Fold();
130 unsigned MIOperandNo = 0;
131 std::set<std::string> OperandNames;
132 for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) {
133 DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i));
135 throw "Illegal operand for the '" + R->getName() + "' instruction!";
137 Record *Rec = Arg->getDef();
138 std::string PrintMethod = "printOperand";
140 DagInit *MIOpInfo = 0;
141 if (Rec->isSubClassOf("Operand")) {
142 PrintMethod = Rec->getValueAsString("PrintMethod");
143 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
145 // Verify that MIOpInfo has an 'ops' root value.
146 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
147 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
148 ->getDef()->getName() != "ops")
149 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
152 // If we have MIOpInfo, then we have #operands equal to number of entries
154 if (unsigned NumArgs = MIOpInfo->getNumArgs())
157 if (Rec->isSubClassOf("PredicateOperand"))
159 else if (Rec->isSubClassOf("OptionalDefOperand"))
160 hasOptionalDef = true;
161 } else if (Rec->getName() == "variable_ops") {
164 } else if (!Rec->isSubClassOf("RegisterClass") &&
165 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
166 throw "Unknown operand class '" + Rec->getName() +
167 "' in instruction '" + R->getName() + "' instruction!";
169 // Check that the operand has a name and that it's unique.
170 if (DI->getArgName(i).empty())
171 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
173 if (!OperandNames.insert(DI->getArgName(i)).second)
174 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
175 " has the same name as a previous operand!";
177 OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod,
178 MIOperandNo, NumOps, MIOpInfo));
179 MIOperandNo += NumOps;
182 // Parse Constraints.
183 ParseConstraints(R->getValueAsString("Constraints"), this);
185 // For backward compatibility: isTwoAddress means operand 1 is tied to
188 if (!OperandList[1].Constraints[0].empty())
189 throw R->getName() + ": cannot use isTwoAddress property: instruction "
190 "already has constraint set!";
191 OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))";
194 // Any operands with unset constraints get 0 as their constraint.
195 for (unsigned op = 0, e = OperandList.size(); op != e; ++op)
196 for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
197 if (OperandList[op].Constraints[j].empty())
198 OperandList[op].Constraints[j] = "0";
200 // Parse the DisableEncoding field.
201 std::string DisableEncoding = R->getValueAsString("DisableEncoding");
203 std::string OpName = getToken(DisableEncoding, " ,\t");
204 if (OpName.empty()) break;
206 // Figure out which operand this is.
207 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
209 // Mark the operand as not-to-be encoded.
210 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
211 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
212 OperandList[Op.first].DoNotEncode[Op.second] = true;
216 /// getOperandNamed - Return the index of the operand with the specified
217 /// non-empty name. If the instruction does not have an operand with the
218 /// specified name, throw an exception.
220 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
221 assert(!Name.empty() && "Cannot search for operand with no name!");
222 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
223 if (OperandList[i].Name == Name) return i;
224 throw "Instruction '" + TheDef->getName() +
225 "' does not have an operand named '$" + Name + "'!";
228 std::pair<unsigned,unsigned>
229 CodeGenInstruction::ParseOperandName(const std::string &Op,
231 if (Op.empty() || Op[0] != '$')
232 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
234 std::string OpName = Op.substr(1);
235 std::string SubOpName;
237 // Check to see if this is $foo.bar.
238 std::string::size_type DotIdx = OpName.find_first_of(".");
239 if (DotIdx != std::string::npos) {
240 SubOpName = OpName.substr(DotIdx+1);
241 if (SubOpName.empty())
242 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
243 OpName = OpName.substr(0, DotIdx);
246 unsigned OpIdx = getOperandNamed(OpName);
248 if (SubOpName.empty()) { // If no suboperand name was specified:
249 // If one was needed, throw.
250 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
252 throw TheDef->getName() + ": Illegal to refer to"
253 " whole operand part of complex operand '" + Op + "'";
255 // Otherwise, return the operand.
256 return std::make_pair(OpIdx, 0U);
259 // Find the suboperand number involved.
260 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
262 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
264 // Find the operand with the right name.
265 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
266 if (MIOpInfo->getArgName(i) == SubOpName)
267 return std::make_pair(OpIdx, i);
269 // Otherwise, didn't find it!
270 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";