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 isCompare = R->getValueAsBit("isCompare");
106 isConditionalMove = R->getValueAsBit("isConditionalMove");
107 isBarrier = R->getValueAsBit("isBarrier");
108 isCall = R->getValueAsBit("isCall");
109 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
110 mayLoad = R->getValueAsBit("mayLoad");
111 mayStore = R->getValueAsBit("mayStore");
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 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
123 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
124 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
125 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
126 hasOptionalDef = false;
128 ImplicitDefs = R->getValueAsListOfDefs("Defs");
129 ImplicitUses = R->getValueAsListOfDefs("Uses");
131 if (neverHasSideEffects + hasSideEffects > 1)
132 throw R->getName() + ": multiple conflicting side-effect flags set!";
134 DagInit *OutDI = R->getValueAsDag("OutOperandList");
136 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) {
137 if (Init->getDef()->getName() != "outs")
138 throw R->getName() + ": invalid def name for output list: use 'outs'";
140 throw R->getName() + ": invalid output list: use 'outs'";
142 NumDefs = OutDI->getNumArgs();
144 DagInit *InDI = R->getValueAsDag("InOperandList");
145 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) {
146 if (Init->getDef()->getName() != "ins")
147 throw R->getName() + ": invalid def name for input list: use 'ins'";
149 throw R->getName() + ": invalid input list: use 'ins'";
151 unsigned MIOperandNo = 0;
152 std::set<std::string> OperandNames;
153 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){
157 ArgInit = OutDI->getArg(i);
158 ArgName = OutDI->getArgName(i);
160 ArgInit = InDI->getArg(i-NumDefs);
161 ArgName = InDI->getArgName(i-NumDefs);
164 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit);
166 throw "Illegal operand for the '" + R->getName() + "' instruction!";
168 Record *Rec = Arg->getDef();
169 std::string PrintMethod = "printOperand";
171 DagInit *MIOpInfo = 0;
172 if (Rec->isSubClassOf("Operand")) {
173 PrintMethod = Rec->getValueAsString("PrintMethod");
174 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
176 // Verify that MIOpInfo has an 'ops' root value.
177 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
178 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
179 ->getDef()->getName() != "ops")
180 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
183 // If we have MIOpInfo, then we have #operands equal to number of entries
185 if (unsigned NumArgs = MIOpInfo->getNumArgs())
188 if (Rec->isSubClassOf("PredicateOperand"))
190 else if (Rec->isSubClassOf("OptionalDefOperand"))
191 hasOptionalDef = true;
192 } else if (Rec->getName() == "variable_ops") {
195 } else if (!Rec->isSubClassOf("RegisterClass") &&
196 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
197 throw "Unknown operand class '" + Rec->getName() +
198 "' in '" + R->getName() + "' instruction!";
200 // Check that the operand has a name and that it's unique.
202 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
204 if (!OperandNames.insert(ArgName).second)
205 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
206 " has the same name as a previous operand!";
208 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod,
209 MIOperandNo, NumOps, MIOpInfo));
210 MIOperandNo += NumOps;
213 // Parse Constraints.
214 ParseConstraints(R->getValueAsString("Constraints"), this);
216 // Parse the DisableEncoding field.
217 std::string DisableEncoding = R->getValueAsString("DisableEncoding");
220 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t");
221 if (OpName.empty()) break;
223 // Figure out which operand this is.
224 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
226 // Mark the operand as not-to-be encoded.
227 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
228 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
229 OperandList[Op.first].DoNotEncode[Op.second] = true;
233 /// getOperandNamed - Return the index of the operand with the specified
234 /// non-empty name. If the instruction does not have an operand with the
235 /// specified name, throw an exception.
237 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
238 assert(!Name.empty() && "Cannot search for operand with no name!");
239 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
240 if (OperandList[i].Name == Name) return i;
241 throw "Instruction '" + TheDef->getName() +
242 "' does not have an operand named '$" + Name + "'!";
245 std::pair<unsigned,unsigned>
246 CodeGenInstruction::ParseOperandName(const std::string &Op,
248 if (Op.empty() || Op[0] != '$')
249 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
251 std::string OpName = Op.substr(1);
252 std::string SubOpName;
254 // Check to see if this is $foo.bar.
255 std::string::size_type DotIdx = OpName.find_first_of(".");
256 if (DotIdx != std::string::npos) {
257 SubOpName = OpName.substr(DotIdx+1);
258 if (SubOpName.empty())
259 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
260 OpName = OpName.substr(0, DotIdx);
263 unsigned OpIdx = getOperandNamed(OpName);
265 if (SubOpName.empty()) { // If no suboperand name was specified:
266 // If one was needed, throw.
267 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
269 throw TheDef->getName() + ": Illegal to refer to"
270 " whole operand part of complex operand '" + Op + "'";
272 // Otherwise, return the operand.
273 return std::make_pair(OpIdx, 0U);
276 // Find the suboperand number involved.
277 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
279 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
281 // Find the operand with the right name.
282 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
283 if (MIOpInfo->getArgName(i) == SubOpName)
284 return std::make_pair(OpIdx, i);
286 // Otherwise, didn't find it!
287 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
291 /// HasOneImplicitDefWithKnownVT - If the instruction has at least one
292 /// implicit def and it has a known VT, return the VT, otherwise return
294 MVT::SimpleValueType CodeGenInstruction::
295 HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const {
296 if (ImplicitDefs.empty()) return MVT::Other;
298 // Check to see if the first implicit def has a resolvable type.
299 Record *FirstImplicitDef = ImplicitDefs[0];
300 assert(FirstImplicitDef->isSubClassOf("Register"));
301 const std::vector<MVT::SimpleValueType> &RegVTs =
302 TargetInfo.getRegisterVTs(FirstImplicitDef);
303 if (RegVTs.size() == 1)