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"
17 #include "llvm/ADT/STLExtras.h"
21 static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
22 // EARLY_CLOBBER: @early $reg
23 std::string::size_type wpos = CStr.find_first_of(" \t");
24 std::string::size_type start = CStr.find_first_not_of(" \t");
25 std::string Tok = CStr.substr(start, wpos - start);
26 if (Tok == "@earlyclobber") {
27 std::string Name = CStr.substr(wpos+1);
28 wpos = Name.find_first_not_of(" \t");
29 if (wpos == std::string::npos)
30 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'";
31 Name = Name.substr(wpos);
32 std::pair<unsigned,unsigned> Op =
33 I->ParseOperandName(Name, false);
35 // Build the string for the operand
36 std::string OpConstraint = "(1 << TOI::EARLY_CLOBBER)";
37 if (!I->OperandList[Op.first].Constraints[Op.second].empty())
38 throw "Operand '" + Name + "' cannot have multiple constraints!";
39 I->OperandList[Op.first].Constraints[Op.second] = OpConstraint;
43 // Only other constraint is "TIED_TO" for now.
44 std::string::size_type pos = CStr.find_first_of('=');
45 assert(pos != std::string::npos && "Unrecognized constraint");
46 start = CStr.find_first_not_of(" \t");
47 std::string Name = CStr.substr(start, pos - start);
49 // TIED_TO: $src1 = $dst
50 wpos = Name.find_first_of(" \t");
51 if (wpos == std::string::npos)
52 throw "Illegal format for tied-to constraint: '" + CStr + "'";
53 std::string DestOpName = Name.substr(0, wpos);
54 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false);
56 Name = CStr.substr(pos+1);
57 wpos = Name.find_first_not_of(" \t");
58 if (wpos == std::string::npos)
59 throw "Illegal format for tied-to constraint: '" + CStr + "'";
61 std::pair<unsigned,unsigned> SrcOp =
62 I->ParseOperandName(Name.substr(wpos), false);
64 throw "Illegal tied-to operand constraint '" + CStr + "'";
67 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp);
68 // Build the string for the operand.
69 std::string OpConstraint =
70 "((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
72 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
73 throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
74 I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;
77 static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) {
78 // Make sure the constraints list for each operand is large enough to hold
79 // constraint info, even if none is present.
80 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i)
81 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands);
83 if (CStr.empty()) return;
85 const std::string delims(",");
86 std::string::size_type bidx, eidx;
88 bidx = CStr.find_first_not_of(delims);
89 while (bidx != std::string::npos) {
90 eidx = CStr.find_first_of(delims, bidx);
91 if (eidx == std::string::npos)
94 ParseConstraint(CStr.substr(bidx, eidx - bidx), I);
95 bidx = CStr.find_first_not_of(delims, eidx);
99 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
100 : TheDef(R), AsmString(AsmStr) {
101 Namespace = R->getValueAsString("Namespace");
103 isReturn = R->getValueAsBit("isReturn");
104 isBranch = R->getValueAsBit("isBranch");
105 isIndirectBranch = R->getValueAsBit("isIndirectBranch");
106 isBarrier = R->getValueAsBit("isBarrier");
107 isCall = R->getValueAsBit("isCall");
108 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
109 mayLoad = R->getValueAsBit("mayLoad");
110 mayStore = R->getValueAsBit("mayStore");
111 bool isTwoAddress = R->getValueAsBit("isTwoAddress");
112 isPredicable = R->getValueAsBit("isPredicable");
113 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
114 isCommutable = R->getValueAsBit("isCommutable");
115 isTerminator = R->getValueAsBit("isTerminator");
116 isReMaterializable = R->getValueAsBit("isReMaterializable");
117 hasDelaySlot = R->getValueAsBit("hasDelaySlot");
118 usesCustomInserter = R->getValueAsBit("usesCustomInserter");
119 hasCtrlDep = R->getValueAsBit("hasCtrlDep");
120 isNotDuplicable = R->getValueAsBit("isNotDuplicable");
121 hasSideEffects = R->getValueAsBit("hasSideEffects");
122 mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
123 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
124 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
125 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
126 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
127 hasOptionalDef = false;
130 if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1)
131 throw R->getName() + ": multiple conflicting side-effect flags set!";
135 DI = R->getValueAsDag("OutOperandList");
137 // Error getting operand list, just ignore it (sparcv9).
142 NumDefs = DI->getNumArgs();
146 IDI = R->getValueAsDag("InOperandList");
148 // Error getting operand list, just ignore it (sparcv9).
153 DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI, new DagRecTy))->Fold(R, 0);
155 unsigned MIOperandNo = 0;
156 std::set<std::string> OperandNames;
157 for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) {
158 DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i));
160 throw "Illegal operand for the '" + R->getName() + "' instruction!";
162 Record *Rec = Arg->getDef();
163 std::string PrintMethod = "printOperand";
165 DagInit *MIOpInfo = 0;
166 if (Rec->isSubClassOf("Operand")) {
167 PrintMethod = Rec->getValueAsString("PrintMethod");
168 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
170 // Verify that MIOpInfo has an 'ops' root value.
171 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
172 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
173 ->getDef()->getName() != "ops")
174 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
177 // If we have MIOpInfo, then we have #operands equal to number of entries
179 if (unsigned NumArgs = MIOpInfo->getNumArgs())
182 if (Rec->isSubClassOf("PredicateOperand"))
184 else if (Rec->isSubClassOf("OptionalDefOperand"))
185 hasOptionalDef = true;
186 } else if (Rec->getName() == "variable_ops") {
189 } else if (!Rec->isSubClassOf("RegisterClass") &&
190 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
191 throw "Unknown operand class '" + Rec->getName() +
192 "' in '" + R->getName() + "' instruction!";
194 // Check that the operand has a name and that it's unique.
195 if (DI->getArgName(i).empty())
196 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
198 if (!OperandNames.insert(DI->getArgName(i)).second)
199 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
200 " has the same name as a previous operand!";
202 OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod,
203 MIOperandNo, NumOps, MIOpInfo));
204 MIOperandNo += NumOps;
207 // Parse Constraints.
208 ParseConstraints(R->getValueAsString("Constraints"), this);
210 // For backward compatibility: isTwoAddress means operand 1 is tied to
213 if (!OperandList[1].Constraints[0].empty())
214 throw R->getName() + ": cannot use isTwoAddress property: instruction "
215 "already has constraint set!";
216 OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))";
219 // Any operands with unset constraints get 0 as their constraint.
220 for (unsigned op = 0, e = OperandList.size(); op != e; ++op)
221 for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
222 if (OperandList[op].Constraints[j].empty())
223 OperandList[op].Constraints[j] = "0";
225 // Parse the DisableEncoding field.
226 std::string DisableEncoding = R->getValueAsString("DisableEncoding");
229 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t");
230 if (OpName.empty()) break;
232 // Figure out which operand this is.
233 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
235 // Mark the operand as not-to-be encoded.
236 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
237 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
238 OperandList[Op.first].DoNotEncode[Op.second] = true;
242 /// getOperandNamed - Return the index of the operand with the specified
243 /// non-empty name. If the instruction does not have an operand with the
244 /// specified name, throw an exception.
246 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
247 assert(!Name.empty() && "Cannot search for operand with no name!");
248 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
249 if (OperandList[i].Name == Name) return i;
250 throw "Instruction '" + TheDef->getName() +
251 "' does not have an operand named '$" + Name + "'!";
254 std::pair<unsigned,unsigned>
255 CodeGenInstruction::ParseOperandName(const std::string &Op,
257 if (Op.empty() || Op[0] != '$')
258 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
260 std::string OpName = Op.substr(1);
261 std::string SubOpName;
263 // Check to see if this is $foo.bar.
264 std::string::size_type DotIdx = OpName.find_first_of(".");
265 if (DotIdx != std::string::npos) {
266 SubOpName = OpName.substr(DotIdx+1);
267 if (SubOpName.empty())
268 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
269 OpName = OpName.substr(0, DotIdx);
272 unsigned OpIdx = getOperandNamed(OpName);
274 if (SubOpName.empty()) { // If no suboperand name was specified:
275 // If one was needed, throw.
276 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
278 throw TheDef->getName() + ": Illegal to refer to"
279 " whole operand part of complex operand '" + Op + "'";
281 // Otherwise, return the operand.
282 return std::make_pair(OpIdx, 0U);
285 // Find the suboperand number involved.
286 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
288 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
290 // Find the operand with the right name.
291 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
292 if (MIOpInfo->getArgName(i) == SubOpName)
293 return std::make_pair(OpIdx, i);
295 // Otherwise, didn't find it!
296 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";