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 Name = R->getValueAsString("Name");
80 Namespace = R->getValueAsString("Namespace");
82 isReturn = R->getValueAsBit("isReturn");
83 isBranch = R->getValueAsBit("isBranch");
84 isIndirectBranch = R->getValueAsBit("isIndirectBranch");
85 isBarrier = R->getValueAsBit("isBarrier");
86 isCall = R->getValueAsBit("isCall");
87 isLoad = R->getValueAsBit("isLoad");
88 mayStore = R->getValueAsBit("mayStore");
89 isImplicitDef= R->getValueAsBit("isImplicitDef");
90 bool isTwoAddress = R->getValueAsBit("isTwoAddress");
91 isPredicable = R->getValueAsBit("isPredicable");
92 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
93 isCommutable = R->getValueAsBit("isCommutable");
94 isTerminator = R->getValueAsBit("isTerminator");
95 isReMaterializable = R->getValueAsBit("isReMaterializable");
96 hasDelaySlot = R->getValueAsBit("hasDelaySlot");
97 usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter");
98 hasCtrlDep = R->getValueAsBit("hasCtrlDep");
99 isNotDuplicable = R->getValueAsBit("isNotDuplicable");
100 mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
101 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
102 hasOptionalDef = false;
103 hasVariableNumberOfOperands = false;
105 if (mayHaveSideEffects && neverHasSideEffects)
107 ": cannot have both 'mayHaveSideEffects' and 'neverHasSideEffects' set!";
111 DI = R->getValueAsDag("OutOperandList");
113 // Error getting operand list, just ignore it (sparcv9).
118 NumDefs = DI->getNumArgs();
122 IDI = R->getValueAsDag("InOperandList");
124 // Error getting operand list, just ignore it (sparcv9).
129 DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI))->Fold();
131 unsigned MIOperandNo = 0;
132 std::set<std::string> OperandNames;
133 for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) {
134 DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i));
136 throw "Illegal operand for the '" + R->getName() + "' instruction!";
138 Record *Rec = Arg->getDef();
139 std::string PrintMethod = "printOperand";
141 DagInit *MIOpInfo = 0;
142 if (Rec->isSubClassOf("Operand")) {
143 PrintMethod = Rec->getValueAsString("PrintMethod");
144 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
146 // Verify that MIOpInfo has an 'ops' root value.
147 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
148 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
149 ->getDef()->getName() != "ops")
150 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
153 // If we have MIOpInfo, then we have #operands equal to number of entries
155 if (unsigned NumArgs = MIOpInfo->getNumArgs())
158 if (Rec->isSubClassOf("PredicateOperand"))
160 else if (Rec->isSubClassOf("OptionalDefOperand"))
161 hasOptionalDef = true;
162 } else if (Rec->getName() == "variable_ops") {
163 hasVariableNumberOfOperands = true;
165 } else if (!Rec->isSubClassOf("RegisterClass") &&
166 Rec->getName() != "ptr_rc")
167 throw "Unknown operand class '" + Rec->getName() +
168 "' in instruction '" + R->getName() + "' instruction!";
170 // Check that the operand has a name and that it's unique.
171 if (DI->getArgName(i).empty())
172 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
174 if (!OperandNames.insert(DI->getArgName(i)).second)
175 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
176 " has the same name as a previous operand!";
178 OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod,
179 MIOperandNo, NumOps, MIOpInfo));
180 MIOperandNo += NumOps;
183 // Parse Constraints.
184 ParseConstraints(R->getValueAsString("Constraints"), this);
186 // For backward compatibility: isTwoAddress means operand 1 is tied to
189 if (!OperandList[1].Constraints[0].empty())
190 throw R->getName() + ": cannot use isTwoAddress property: instruction "
191 "already has constraint set!";
192 OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))";
195 // Any operands with unset constraints get 0 as their constraint.
196 for (unsigned op = 0, e = OperandList.size(); op != e; ++op)
197 for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
198 if (OperandList[op].Constraints[j].empty())
199 OperandList[op].Constraints[j] = "0";
201 // Parse the DisableEncoding field.
202 std::string DisableEncoding = R->getValueAsString("DisableEncoding");
204 std::string OpName = getToken(DisableEncoding, " ,\t");
205 if (OpName.empty()) break;
207 // Figure out which operand this is.
208 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
210 // Mark the operand as not-to-be encoded.
211 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
212 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
213 OperandList[Op.first].DoNotEncode[Op.second] = true;
217 /// getName - Return the contents of the instruction Name field if set,
218 /// otherwise return the name of the def.
219 std::string CodeGenInstruction::getName() const {
220 if (!Name.empty()) return Name;
221 return TheDef->getName();
225 /// getOperandNamed - Return the index of the operand with the specified
226 /// non-empty name. If the instruction does not have an operand with the
227 /// specified name, throw an exception.
229 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
230 assert(!Name.empty() && "Cannot search for operand with no name!");
231 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
232 if (OperandList[i].Name == Name) return i;
233 throw "Instruction '" + TheDef->getName() +
234 "' does not have an operand named '$" + Name + "'!";
237 std::pair<unsigned,unsigned>
238 CodeGenInstruction::ParseOperandName(const std::string &Op,
240 if (Op.empty() || Op[0] != '$')
241 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
243 std::string OpName = Op.substr(1);
244 std::string SubOpName;
246 // Check to see if this is $foo.bar.
247 std::string::size_type DotIdx = OpName.find_first_of(".");
248 if (DotIdx != std::string::npos) {
249 SubOpName = OpName.substr(DotIdx+1);
250 if (SubOpName.empty())
251 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
252 OpName = OpName.substr(0, DotIdx);
255 unsigned OpIdx = getOperandNamed(OpName);
257 if (SubOpName.empty()) { // If no suboperand name was specified:
258 // If one was needed, throw.
259 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
261 throw TheDef->getName() + ": Illegal to refer to"
262 " whole operand part of complex operand '" + Op + "'";
264 // Otherwise, return the operand.
265 return std::make_pair(OpIdx, 0U);
268 // Find the suboperand number involved.
269 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
271 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
273 // Find the operand with the right name.
274 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
275 if (MIOpInfo->getArgName(i) == SubOpName)
276 return std::make_pair(OpIdx, i);
278 // Otherwise, didn't find it!
279 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";