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"
15 #include "CodeGenTarget.h"
17 #include "llvm/ADT/StringExtras.h"
18 #include "llvm/ADT/STLExtras.h"
22 static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
23 // EARLY_CLOBBER: @early $reg
24 std::string::size_type wpos = CStr.find_first_of(" \t");
25 std::string::size_type start = CStr.find_first_not_of(" \t");
26 std::string Tok = CStr.substr(start, wpos - start);
27 if (Tok == "@earlyclobber") {
28 std::string Name = CStr.substr(wpos+1);
29 wpos = Name.find_first_not_of(" \t");
30 if (wpos == std::string::npos)
31 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'";
32 Name = Name.substr(wpos);
33 std::pair<unsigned,unsigned> Op =
34 I->ParseOperandName(Name, false);
36 // Build the string for the operand
37 if (!I->OperandList[Op.first].Constraints[Op.second].isNone())
38 throw "Operand '" + Name + "' cannot have multiple constraints!";
39 I->OperandList[Op.first].Constraints[Op.second] =
40 CodeGenInstruction::ConstraintInfo::getEarlyClobber();
44 // Only other constraint is "TIED_TO" for now.
45 std::string::size_type pos = CStr.find_first_of('=');
46 assert(pos != std::string::npos && "Unrecognized constraint");
47 start = CStr.find_first_not_of(" \t");
48 std::string Name = CStr.substr(start, pos - start);
50 // TIED_TO: $src1 = $dst
51 wpos = Name.find_first_of(" \t");
52 if (wpos == std::string::npos)
53 throw "Illegal format for tied-to constraint: '" + CStr + "'";
54 std::string DestOpName = Name.substr(0, wpos);
55 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false);
57 Name = CStr.substr(pos+1);
58 wpos = Name.find_first_not_of(" \t");
59 if (wpos == std::string::npos)
60 throw "Illegal format for tied-to constraint: '" + CStr + "'";
62 std::pair<unsigned,unsigned> SrcOp =
63 I->ParseOperandName(Name.substr(wpos), false);
65 throw "Illegal tied-to operand constraint '" + CStr + "'";
68 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp);
70 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].isNone())
71 throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
72 I->OperandList[DestOp.first].Constraints[DestOp.second] =
73 CodeGenInstruction::ConstraintInfo::getTied(FlatOpNo);
76 static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) {
77 // Make sure the constraints list for each operand is large enough to hold
78 // constraint info, even if none is present.
79 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i)
80 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands);
82 if (CStr.empty()) return;
84 const std::string delims(",");
85 std::string::size_type bidx, eidx;
87 bidx = CStr.find_first_not_of(delims);
88 while (bidx != std::string::npos) {
89 eidx = CStr.find_first_of(delims, bidx);
90 if (eidx == std::string::npos)
93 ParseConstraint(CStr.substr(bidx, eidx - bidx), I);
94 bidx = CStr.find_first_not_of(delims, eidx);
98 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
99 : TheDef(R), AsmString(AsmStr) {
100 Namespace = R->getValueAsString("Namespace");
102 isReturn = R->getValueAsBit("isReturn");
103 isBranch = R->getValueAsBit("isBranch");
104 isIndirectBranch = R->getValueAsBit("isIndirectBranch");
105 isBarrier = R->getValueAsBit("isBarrier");
106 isCall = R->getValueAsBit("isCall");
107 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
108 mayLoad = R->getValueAsBit("mayLoad");
109 mayStore = R->getValueAsBit("mayStore");
110 isPredicable = R->getValueAsBit("isPredicable");
111 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
112 isCommutable = R->getValueAsBit("isCommutable");
113 isTerminator = R->getValueAsBit("isTerminator");
114 isReMaterializable = R->getValueAsBit("isReMaterializable");
115 hasDelaySlot = R->getValueAsBit("hasDelaySlot");
116 usesCustomInserter = R->getValueAsBit("usesCustomInserter");
117 hasCtrlDep = R->getValueAsBit("hasCtrlDep");
118 isNotDuplicable = R->getValueAsBit("isNotDuplicable");
119 hasSideEffects = R->getValueAsBit("hasSideEffects");
120 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
121 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
122 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
123 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
124 hasOptionalDef = false;
126 ImplicitDefs = R->getValueAsListOfDefs("Defs");
127 ImplicitUses = R->getValueAsListOfDefs("Uses");
129 if (neverHasSideEffects + hasSideEffects > 1)
130 throw R->getName() + ": multiple conflicting side-effect flags set!";
132 DagInit *OutDI = R->getValueAsDag("OutOperandList");
134 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) {
135 if (Init->getDef()->getName() != "outs")
136 throw R->getName() + ": invalid def name for output list: use 'outs'";
138 throw R->getName() + ": invalid output list: use 'outs'";
140 NumDefs = OutDI->getNumArgs();
142 DagInit *InDI = R->getValueAsDag("InOperandList");
143 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) {
144 if (Init->getDef()->getName() != "ins")
145 throw R->getName() + ": invalid def name for input list: use 'ins'";
147 throw R->getName() + ": invalid input list: use 'ins'";
149 unsigned MIOperandNo = 0;
150 std::set<std::string> OperandNames;
151 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){
155 ArgInit = OutDI->getArg(i);
156 ArgName = OutDI->getArgName(i);
158 ArgInit = InDI->getArg(i-NumDefs);
159 ArgName = InDI->getArgName(i-NumDefs);
162 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit);
164 throw "Illegal operand for the '" + R->getName() + "' instruction!";
166 Record *Rec = Arg->getDef();
167 std::string PrintMethod = "printOperand";
169 DagInit *MIOpInfo = 0;
170 if (Rec->isSubClassOf("Operand")) {
171 PrintMethod = Rec->getValueAsString("PrintMethod");
172 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
174 // Verify that MIOpInfo has an 'ops' root value.
175 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
176 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
177 ->getDef()->getName() != "ops")
178 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
181 // If we have MIOpInfo, then we have #operands equal to number of entries
183 if (unsigned NumArgs = MIOpInfo->getNumArgs())
186 if (Rec->isSubClassOf("PredicateOperand"))
188 else if (Rec->isSubClassOf("OptionalDefOperand"))
189 hasOptionalDef = true;
190 } else if (Rec->getName() == "variable_ops") {
193 } else if (!Rec->isSubClassOf("RegisterClass") &&
194 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
195 throw "Unknown operand class '" + Rec->getName() +
196 "' in '" + R->getName() + "' instruction!";
198 // Check that the operand has a name and that it's unique.
200 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
202 if (!OperandNames.insert(ArgName).second)
203 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
204 " has the same name as a previous operand!";
206 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod,
207 MIOperandNo, NumOps, MIOpInfo));
208 MIOperandNo += NumOps;
211 // Parse Constraints.
212 ParseConstraints(R->getValueAsString("Constraints"), this);
214 // Parse the DisableEncoding field.
215 std::string DisableEncoding = R->getValueAsString("DisableEncoding");
218 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t");
219 if (OpName.empty()) break;
221 // Figure out which operand this is.
222 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
224 // Mark the operand as not-to-be encoded.
225 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
226 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
227 OperandList[Op.first].DoNotEncode[Op.second] = true;
231 /// getOperandNamed - Return the index of the operand with the specified
232 /// non-empty name. If the instruction does not have an operand with the
233 /// specified name, throw an exception.
235 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
236 assert(!Name.empty() && "Cannot search for operand with no name!");
237 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
238 if (OperandList[i].Name == Name) return i;
239 throw "Instruction '" + TheDef->getName() +
240 "' does not have an operand named '$" + Name + "'!";
243 std::pair<unsigned,unsigned>
244 CodeGenInstruction::ParseOperandName(const std::string &Op,
246 if (Op.empty() || Op[0] != '$')
247 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
249 std::string OpName = Op.substr(1);
250 std::string SubOpName;
252 // Check to see if this is $foo.bar.
253 std::string::size_type DotIdx = OpName.find_first_of(".");
254 if (DotIdx != std::string::npos) {
255 SubOpName = OpName.substr(DotIdx+1);
256 if (SubOpName.empty())
257 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
258 OpName = OpName.substr(0, DotIdx);
261 unsigned OpIdx = getOperandNamed(OpName);
263 if (SubOpName.empty()) { // If no suboperand name was specified:
264 // If one was needed, throw.
265 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
267 throw TheDef->getName() + ": Illegal to refer to"
268 " whole operand part of complex operand '" + Op + "'";
270 // Otherwise, return the operand.
271 return std::make_pair(OpIdx, 0U);
274 // Find the suboperand number involved.
275 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
277 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
279 // Find the operand with the right name.
280 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
281 if (MIOpInfo->getArgName(i) == SubOpName)
282 return std::make_pair(OpIdx, i);
284 // Otherwise, didn't find it!
285 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
289 /// HasOneImplicitDefWithKnownVT - If the instruction has at least one
290 /// implicit def and it has a known VT, return the VT, otherwise return
292 MVT::SimpleValueType CodeGenInstruction::
293 HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const {
294 if (ImplicitDefs.empty()) return MVT::Other;
296 // Check to see if the first implicit def has a resolvable type.
297 Record *FirstImplicitDef = ImplicitDefs[0];
298 assert(FirstImplicitDef->isSubClassOf("Register"));
299 const std::vector<MVT::SimpleValueType> &RegVTs =
300 TargetInfo.getRegisterVTs(FirstImplicitDef);
301 if (RegVTs.size() == 1)