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 //===----------------------------------------------------------------------===//
23 // CGIOperandList Implementation
24 //===----------------------------------------------------------------------===//
26 CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
28 hasOptionalDef = false;
31 DagInit *OutDI = R->getValueAsDag("OutOperandList");
33 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) {
34 if (Init->getDef()->getName() != "outs")
35 throw R->getName() + ": invalid def name for output list: use 'outs'";
37 throw R->getName() + ": invalid output list: use 'outs'";
39 NumDefs = OutDI->getNumArgs();
41 DagInit *InDI = R->getValueAsDag("InOperandList");
42 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) {
43 if (Init->getDef()->getName() != "ins")
44 throw R->getName() + ": invalid def name for input list: use 'ins'";
46 throw R->getName() + ": invalid input list: use 'ins'";
48 unsigned MIOperandNo = 0;
49 std::set<std::string> OperandNames;
50 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){
54 ArgInit = OutDI->getArg(i);
55 ArgName = OutDI->getArgName(i);
57 ArgInit = InDI->getArg(i-NumDefs);
58 ArgName = InDI->getArgName(i-NumDefs);
61 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit);
63 throw "Illegal operand for the '" + R->getName() + "' instruction!";
65 Record *Rec = Arg->getDef();
66 std::string PrintMethod = "printOperand";
67 std::string EncoderMethod;
69 DagInit *MIOpInfo = 0;
70 if (Rec->isSubClassOf("Operand")) {
71 PrintMethod = Rec->getValueAsString("PrintMethod");
72 // If there is an explicit encoder method, use it.
73 if (Rec->getValue("EncoderMethod"))
74 EncoderMethod = Rec->getValueAsString("EncoderMethod");
75 MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
77 // Verify that MIOpInfo has an 'ops' root value.
78 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
79 dynamic_cast<DefInit*>(MIOpInfo->getOperator())
80 ->getDef()->getName() != "ops")
81 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
84 // If we have MIOpInfo, then we have #operands equal to number of entries
86 if (unsigned NumArgs = MIOpInfo->getNumArgs())
89 if (Rec->isSubClassOf("PredicateOperand"))
91 else if (Rec->isSubClassOf("OptionalDefOperand"))
92 hasOptionalDef = true;
93 } else if (Rec->getName() == "variable_ops") {
96 } else if (!Rec->isSubClassOf("RegisterClass") &&
97 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown")
98 throw "Unknown operand class '" + Rec->getName() +
99 "' in '" + R->getName() + "' instruction!";
101 // Check that the operand has a name and that it's unique.
103 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
105 if (!OperandNames.insert(ArgName).second)
106 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
107 " has the same name as a previous operand!";
109 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, EncoderMethod,
110 MIOperandNo, NumOps, MIOpInfo));
111 MIOperandNo += NumOps;
116 /// getOperandNamed - Return the index of the operand with the specified
117 /// non-empty name. If the instruction does not have an operand with the
118 /// specified name, throw an exception.
120 unsigned CGIOperandList::getOperandNamed(StringRef Name) const {
122 if (hasOperandNamed(Name, OpIdx)) return OpIdx;
123 throw "'" + TheDef->getName() + "' does not have an operand named '$" +
127 /// hasOperandNamed - Query whether the instruction has an operand of the
128 /// given name. If so, return true and set OpIdx to the index of the
129 /// operand. Otherwise, return false.
130 bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const {
131 assert(!Name.empty() && "Cannot search for operand with no name!");
132 for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
133 if (OperandList[i].Name == Name) {
140 std::pair<unsigned,unsigned>
141 CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) {
142 if (Op.empty() || Op[0] != '$')
143 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
145 std::string OpName = Op.substr(1);
146 std::string SubOpName;
148 // Check to see if this is $foo.bar.
149 std::string::size_type DotIdx = OpName.find_first_of(".");
150 if (DotIdx != std::string::npos) {
151 SubOpName = OpName.substr(DotIdx+1);
152 if (SubOpName.empty())
153 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
154 OpName = OpName.substr(0, DotIdx);
157 unsigned OpIdx = getOperandNamed(OpName);
159 if (SubOpName.empty()) { // If no suboperand name was specified:
160 // If one was needed, throw.
161 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
163 throw TheDef->getName() + ": Illegal to refer to"
164 " whole operand part of complex operand '" + Op + "'";
166 // Otherwise, return the operand.
167 return std::make_pair(OpIdx, 0U);
170 // Find the suboperand number involved.
171 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
173 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
175 // Find the operand with the right name.
176 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
177 if (MIOpInfo->getArgName(i) == SubOpName)
178 return std::make_pair(OpIdx, i);
180 // Otherwise, didn't find it!
181 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
184 static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) {
185 // EARLY_CLOBBER: @early $reg
186 std::string::size_type wpos = CStr.find_first_of(" \t");
187 std::string::size_type start = CStr.find_first_not_of(" \t");
188 std::string Tok = CStr.substr(start, wpos - start);
189 if (Tok == "@earlyclobber") {
190 std::string Name = CStr.substr(wpos+1);
191 wpos = Name.find_first_not_of(" \t");
192 if (wpos == std::string::npos)
193 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'";
194 Name = Name.substr(wpos);
195 std::pair<unsigned,unsigned> Op = Ops.ParseOperandName(Name, false);
197 // Build the string for the operand
198 if (!Ops[Op.first].Constraints[Op.second].isNone())
199 throw "Operand '" + Name + "' cannot have multiple constraints!";
200 Ops[Op.first].Constraints[Op.second] =
201 CGIOperandList::ConstraintInfo::getEarlyClobber();
205 // Only other constraint is "TIED_TO" for now.
206 std::string::size_type pos = CStr.find_first_of('=');
207 assert(pos != std::string::npos && "Unrecognized constraint");
208 start = CStr.find_first_not_of(" \t");
209 std::string Name = CStr.substr(start, pos - start);
211 // TIED_TO: $src1 = $dst
212 wpos = Name.find_first_of(" \t");
213 if (wpos == std::string::npos)
214 throw "Illegal format for tied-to constraint: '" + CStr + "'";
215 std::string DestOpName = Name.substr(0, wpos);
216 std::pair<unsigned,unsigned> DestOp = Ops.ParseOperandName(DestOpName, false);
218 Name = CStr.substr(pos+1);
219 wpos = Name.find_first_not_of(" \t");
220 if (wpos == std::string::npos)
221 throw "Illegal format for tied-to constraint: '" + CStr + "'";
223 std::pair<unsigned,unsigned> SrcOp =
224 Ops.ParseOperandName(Name.substr(wpos), false);
226 throw "Illegal tied-to operand constraint '" + CStr + "'";
229 unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp);
231 if (!Ops[DestOp.first].Constraints[DestOp.second].isNone())
232 throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
233 Ops[DestOp.first].Constraints[DestOp.second] =
234 CGIOperandList::ConstraintInfo::getTied(FlatOpNo);
237 static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) {
238 // Make sure the constraints list for each operand is large enough to hold
239 // constraint info, even if none is present.
240 for (unsigned i = 0, e = Ops.size(); i != e; ++i)
241 Ops[i].Constraints.resize(Ops[i].MINumOperands);
243 if (CStr.empty()) return;
245 const std::string delims(",");
246 std::string::size_type bidx, eidx;
248 bidx = CStr.find_first_not_of(delims);
249 while (bidx != std::string::npos) {
250 eidx = CStr.find_first_of(delims, bidx);
251 if (eidx == std::string::npos)
252 eidx = CStr.length();
254 ParseConstraint(CStr.substr(bidx, eidx - bidx), Ops);
255 bidx = CStr.find_first_not_of(delims, eidx);
259 void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) {
262 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t");
263 if (OpName.empty()) break;
265 // Figure out which operand this is.
266 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
268 // Mark the operand as not-to-be encoded.
269 if (Op.second >= OperandList[Op.first].DoNotEncode.size())
270 OperandList[Op.first].DoNotEncode.resize(Op.second+1);
271 OperandList[Op.first].DoNotEncode[Op.second] = true;
276 //===----------------------------------------------------------------------===//
277 // CodeGenInstruction Implementation
278 //===----------------------------------------------------------------------===//
280 CodeGenInstruction::CodeGenInstruction(Record *R) : TheDef(R), Operands(R) {
281 Namespace = R->getValueAsString("Namespace");
282 AsmString = R->getValueAsString("AsmString");
284 isReturn = R->getValueAsBit("isReturn");
285 isBranch = R->getValueAsBit("isBranch");
286 isIndirectBranch = R->getValueAsBit("isIndirectBranch");
287 isCompare = R->getValueAsBit("isCompare");
288 isBarrier = R->getValueAsBit("isBarrier");
289 isCall = R->getValueAsBit("isCall");
290 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
291 mayLoad = R->getValueAsBit("mayLoad");
292 mayStore = R->getValueAsBit("mayStore");
293 isPredicable = Operands.isPredicable || R->getValueAsBit("isPredicable");
294 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
295 isCommutable = R->getValueAsBit("isCommutable");
296 isTerminator = R->getValueAsBit("isTerminator");
297 isReMaterializable = R->getValueAsBit("isReMaterializable");
298 hasDelaySlot = R->getValueAsBit("hasDelaySlot");
299 usesCustomInserter = R->getValueAsBit("usesCustomInserter");
300 hasCtrlDep = R->getValueAsBit("hasCtrlDep");
301 isNotDuplicable = R->getValueAsBit("isNotDuplicable");
302 hasSideEffects = R->getValueAsBit("hasSideEffects");
303 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
304 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
305 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
306 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
307 ImplicitDefs = R->getValueAsListOfDefs("Defs");
308 ImplicitUses = R->getValueAsListOfDefs("Uses");
310 if (neverHasSideEffects + hasSideEffects > 1)
311 throw R->getName() + ": multiple conflicting side-effect flags set!";
313 // Parse Constraints.
314 ParseConstraints(R->getValueAsString("Constraints"), Operands);
316 // Parse the DisableEncoding field.
317 Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding"));
320 /// HasOneImplicitDefWithKnownVT - If the instruction has at least one
321 /// implicit def and it has a known VT, return the VT, otherwise return
323 MVT::SimpleValueType CodeGenInstruction::
324 HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const {
325 if (ImplicitDefs.empty()) return MVT::Other;
327 // Check to see if the first implicit def has a resolvable type.
328 Record *FirstImplicitDef = ImplicitDefs[0];
329 assert(FirstImplicitDef->isSubClassOf("Register"));
330 const std::vector<MVT::SimpleValueType> &RegVTs =
331 TargetInfo.getRegisterVTs(FirstImplicitDef);
332 if (RegVTs.size() == 1)
338 /// FlattenAsmStringVariants - Flatten the specified AsmString to only
339 /// include text from the specified variant, returning the new string.
340 std::string CodeGenInstruction::
341 FlattenAsmStringVariants(StringRef Cur, unsigned Variant) {
342 std::string Res = "";
345 // Find the start of the next variant string.
346 size_t VariantsStart = 0;
347 for (size_t e = Cur.size(); VariantsStart != e; ++VariantsStart)
348 if (Cur[VariantsStart] == '{' &&
349 (VariantsStart == 0 || (Cur[VariantsStart-1] != '$' &&
350 Cur[VariantsStart-1] != '\\')))
353 // Add the prefix to the result.
354 Res += Cur.slice(0, VariantsStart);
355 if (VariantsStart == Cur.size())
358 ++VariantsStart; // Skip the '{'.
360 // Scan to the end of the variants string.
361 size_t VariantsEnd = VariantsStart;
362 unsigned NestedBraces = 1;
363 for (size_t e = Cur.size(); VariantsEnd != e; ++VariantsEnd) {
364 if (Cur[VariantsEnd] == '}' && Cur[VariantsEnd-1] != '\\') {
365 if (--NestedBraces == 0)
367 } else if (Cur[VariantsEnd] == '{')
371 // Select the Nth variant (or empty).
372 StringRef Selection = Cur.slice(VariantsStart, VariantsEnd);
373 for (unsigned i = 0; i != Variant; ++i)
374 Selection = Selection.split('|').second;
375 Res += Selection.split('|').first;
377 assert(VariantsEnd != Cur.size() &&
378 "Unterminated variants in assembly string!");
379 Cur = Cur.substr(VariantsEnd + 1);