#include "AsmWriterEmitter.h"
#include "AsmWriterInst.h"
+#include "Error.h"
#include "CodeGenTarget.h"
#include "Record.h"
#include "StringToOffsetTable.h"
+#include "llvm/ADT/Twine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
}
void AsmWriterEmitter::
-FindUniqueOperandCommands(std::vector<std::string> &UniqueOperandCommands,
+FindUniqueOperandCommands(std::vector<std::string> &UniqueOperandCommands,
std::vector<unsigned> &InstIdxs,
std::vector<unsigned> &InstOpsUsed) const {
InstIdxs.assign(NumberedInstructions.size(), ~0U);
-
+
// This vector parallels UniqueOperandCommands, keeping track of which
// instructions each case are used for. It is a comma separated string of
// enums.
std::vector<std::string> InstrsForCase;
InstrsForCase.resize(UniqueOperandCommands.size());
InstOpsUsed.assign(UniqueOperandCommands.size(), 0);
-
+
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
const AsmWriterInst *Inst = getAsmWriterInstByID(i);
- if (Inst == 0) continue; // PHI, INLINEASM, DBG_LABEL, etc.
-
+ if (Inst == 0) continue; // PHI, INLINEASM, PROLOG_LABEL, etc.
+
std::string Command;
if (Inst->Operands.empty())
continue; // Instruction already done.
InstOpsUsed.push_back(1);
}
}
-
+
// For each entry of UniqueOperandCommands, there is a set of instructions
// that uses it. If the next command of all instructions in the set are
// identical, fold it into the command.
for (unsigned CommandIdx = 0, e = UniqueOperandCommands.size();
CommandIdx != e; ++CommandIdx) {
-
+
for (unsigned Op = 1; ; ++Op) {
// Scan for the first instruction in the set.
std::vector<unsigned>::iterator NIT =
// If this instruction has no more operands, we isn't anything to merge
// into this command.
- const AsmWriterInst *FirstInst =
+ const AsmWriterInst *FirstInst =
getAsmWriterInstByID(NIT-InstIdxs.begin());
if (!FirstInst || FirstInst->Operands.size() == Op)
break;
NIT = std::find(NIT+1, InstIdxs.end(), CommandIdx)) {
// Okay, found another instruction in this command set. If the operand
// matches, we're ok, otherwise bail out.
- const AsmWriterInst *OtherInst =
+ const AsmWriterInst *OtherInst =
getAsmWriterInstByID(NIT-InstIdxs.begin());
if (OtherInst &&
}
}
if (!AllSame) break;
-
+
// Okay, everything in this command set has the same next operand. Add it
// to UniqueOperandCommands and remember that it was consumed.
std::string Command = " " + FirstInst->Operands[Op].getCode() + "\n";
-
+
UniqueOperandCommands[CommandIdx] += Command;
InstOpsUsed[CommandIdx]++;
}
}
-
+
// Prepend some of the instructions each case is used for onto the case val.
for (unsigned i = 0, e = InstrsForCase.size(); i != e; ++i) {
std::string Instrs = InstrsForCase[i];
Instrs.erase(Instrs.begin()+70, Instrs.end());
Instrs += "...";
}
-
+
if (!Instrs.empty())
- UniqueOperandCommands[i] = " // " + Instrs + "\n" +
+ UniqueOperandCommands[i] = " // " + Instrs + "\n" +
UniqueOperandCommands[i];
}
}
/// EmitPrintInstruction - Generate the code for the "printInstruction" method
/// implementation.
void AsmWriterEmitter::EmitPrintInstruction(raw_ostream &O) {
- CodeGenTarget Target;
+ CodeGenTarget Target(Records);
Record *AsmWriter = Target.getAsmWriter();
std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
-
+ bool isMC = AsmWriter->getValueAsBit("isMCAsmWriter");
+ const char *MachineInstrClassName = isMC ? "MCInst" : "MachineInstr";
+
O <<
"/// printInstruction - This method is automatically generated by tablegen\n"
"/// from the instruction set description.\n"
"void " << Target.getName() << ClassName
- << "::printInstruction(const MachineInstr *MI) {\n";
+ << "::printInstruction(const " << MachineInstrClassName
+ << " *MI, raw_ostream &O) {\n";
std::vector<AsmWriterInst> Instructions;
for (CodeGenTarget::inst_iterator I = Target.inst_begin(),
E = Target.inst_end(); I != E; ++I)
- if (!I->second.AsmString.empty() &&
- I->second.TheDef->getName() != "PHI")
+ if (!(*I)->AsmString.empty() &&
+ (*I)->TheDef->getName() != "PHI")
Instructions.push_back(
- AsmWriterInst(I->second,
+ AsmWriterInst(**I,
AsmWriter->getValueAsInt("Variant"),
AsmWriter->getValueAsInt("FirstOperandColumn"),
AsmWriter->getValueAsInt("OperandSpacing")));
// Get the instruction numbering.
NumberedInstructions = Target.getInstructionsByEnumValue();
-
+
// Compute the CodeGenInstruction -> AsmWriterInst mapping. Note that not
// all machine instructions are necessarily being printed, so there may be
// target instructions not in this map.
// Build an aggregate string, and build a table of offsets into it.
StringToOffsetTable StringTable;
-
+
/// OpcodeInfo - This encodes the index of the string to use for the first
/// chunk of the output as well as indices used for operand printing.
std::vector<unsigned> OpcodeInfo;
-
+
unsigned MaxStringIdx = 0;
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
AsmWriterInst *AWI = CGIAWIMap[NumberedInstructions[i]];
if (AWI == 0) {
// Something not handled by the asmwriter printer.
Idx = ~0U;
- } else if (AWI->Operands[0].OperandType !=
+ } else if (AWI->Operands[0].OperandType !=
AsmWriterOperand::isLiteralTextOperand ||
AWI->Operands[0].Str.empty()) {
// Something handled by the asmwriter printer, but with no leading string.
UnescapeString(Str);
Idx = StringTable.GetOrAddStringOffset(Str);
MaxStringIdx = std::max(MaxStringIdx, Idx);
-
+
// Nuke the string from the operand list. It is now handled!
AWI->Operands.erase(AWI->Operands.begin());
}
-
+
// Bias offset by one since we want 0 as a sentinel.
OpcodeInfo.push_back(Idx+1);
}
-
+
// Figure out how many bits we used for the string index.
unsigned AsmStrBits = Log2_32_Ceil(MaxStringIdx+2);
-
+
// To reduce code size, we compactify common instructions into a few bits
// in the opcode-indexed table.
unsigned BitsLeft = 32-AsmStrBits;
std::vector<std::vector<std::string> > TableDrivenOperandPrinters;
-
+
while (1) {
std::vector<std::string> UniqueOperandCommands;
std::vector<unsigned> InstIdxs;
std::vector<unsigned> NumInstOpsHandled;
FindUniqueOperandCommands(UniqueOperandCommands, InstIdxs,
NumInstOpsHandled);
-
+
// If we ran out of operands to print, we're done.
if (UniqueOperandCommands.empty()) break;
-
+
// Compute the number of bits we need to represent these cases, this is
// ceil(log2(numentries)).
unsigned NumBits = Log2_32_Ceil(UniqueOperandCommands.size());
-
+
// If we don't have enough bits for this operand, don't include it.
if (NumBits > BitsLeft) {
DEBUG(errs() << "Not enough bits to densely encode " << NumBits
<< " more bits\n");
break;
}
-
+
// Otherwise, we can include this in the initial lookup table. Add it in.
BitsLeft -= NumBits;
for (unsigned i = 0, e = InstIdxs.size(); i != e; ++i)
if (InstIdxs[i] != ~0U)
OpcodeInfo[i] |= InstIdxs[i] << (BitsLeft+AsmStrBits);
-
+
// Remove the info about this operand.
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
if (AsmWriterInst *Inst = getAsmWriterInstByID(i))
Inst->Operands.begin()+NumOps);
}
}
-
+
// Remember the handlers for this set of operands.
TableDrivenOperandPrinters.push_back(UniqueOperandCommands);
}
-
-
-
+
+
+
O<<" static const unsigned OpInfo[] = {\n";
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
O << " " << OpcodeInfo[i] << "U,\t// "
// Add a dummy entry so the array init doesn't end with a comma.
O << " 0U\n";
O << " };\n\n";
-
+
// Emit the string itself.
O << " const char *AsmStrs = \n";
StringTable.EmitString(O);
// ceil(log2(numentries)).
unsigned NumBits = Log2_32_Ceil(Commands.size());
assert(NumBits <= BitsLeft && "consistency error");
-
+
// Emit code to extract this field from Bits.
BitsLeft -= NumBits;
-
+
O << "\n // Fragment " << i << " encoded into " << NumBits
<< " bits for " << Commands.size() << " unique commands.\n";
-
+
if (Commands.size() == 2) {
// Emit two possibilitys with if/else.
O << " if ((Bits >> " << (BitsLeft+AsmStrBits) << ") & "
<< " } else {\n"
<< Commands[0]
<< " }\n\n";
+ } else if (Commands.size() == 1) {
+ // Emit a single possibility.
+ O << Commands[0] << "\n\n";
} else {
O << " switch ((Bits >> " << (BitsLeft+AsmStrBits) << ") & "
<< ((1 << NumBits)-1) << ") {\n"
<< " default: // unreachable.\n";
-
+
// Print out all the cases.
for (unsigned i = 0, e = Commands.size(); i != e; ++i) {
O << " case " << i << ":\n";
O << " }\n\n";
}
}
-
+
// Okay, delete instructions with no operand info left.
for (unsigned i = 0, e = Instructions.size(); i != e; ++i) {
// Entire instruction has been emitted?
}
}
-
+
// Because this is a vector, we want to emit from the end. Reverse all of the
// elements in the vector.
std::reverse(Instructions.begin(), Instructions.end());
-
-
+
+
// Now that we've emitted all of the operand info that fit into 32 bits, emit
// information for those instructions that are left. This is a less dense
// encoding, but we expect the main 32-bit table to handle the majority of
O << "}\n";
}
+static void
+emitRegisterNameString(raw_ostream &O, StringRef AltName,
+ const std::vector<CodeGenRegister*> &Registers) {
+ StringToOffsetTable StringTable;
+ O << " static const unsigned RegAsmOffset" << AltName << "[] = {\n ";
+ for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
+ const CodeGenRegister &Reg = *Registers[i];
+
+ StringRef AsmName;
+ // "NoRegAltName" is special. We don't need to do a lookup for that,
+ // as it's just a reference to the default register name.
+ if (AltName == "" || AltName == "NoRegAltName") {
+ AsmName = Reg.TheDef->getValueAsString("AsmName");
+ if (AsmName.empty())
+ AsmName = Reg.getName();
+ } else {
+ // Make sure the register has an alternate name for this index.
+ std::vector<Record*> AltNameList =
+ Reg.TheDef->getValueAsListOfDefs("RegAltNameIndices");
+ unsigned Idx = 0, e;
+ for (e = AltNameList.size();
+ Idx < e && (AltNameList[Idx]->getName() != AltName);
+ ++Idx)
+ ;
+ // If the register has an alternate name for this index, use it.
+ // Otherwise, leave it empty as an error flag.
+ if (Idx < e) {
+ std::vector<std::string> AltNames =
+ Reg.TheDef->getValueAsListOfStrings("AltNames");
+ if (AltNames.size() <= Idx)
+ throw TGError(Reg.TheDef->getLoc(),
+ (Twine("Register definition missing alt name for '") +
+ AltName + "'.").str());
+ AsmName = AltNames[Idx];
+ }
+ }
+
+ O << StringTable.GetOrAddStringOffset(AsmName);
+ if (((i + 1) % 14) == 0)
+ O << ",\n ";
+ else
+ O << ", ";
+
+ }
+ O << "0\n"
+ << " };\n"
+ << "\n";
+
+ O << " const char *AsmStrs" << AltName << " =\n";
+ StringTable.EmitString(O);
+ O << ";\n";
+}
void AsmWriterEmitter::EmitGetRegisterName(raw_ostream &O) {
- CodeGenTarget Target;
+ CodeGenTarget Target(Records);
Record *AsmWriter = Target.getAsmWriter();
std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
- const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
-
- StringToOffsetTable StringTable;
+ const std::vector<CodeGenRegister*> &Registers =
+ Target.getRegBank().getRegisters();
+ std::vector<Record*> AltNameIndices = Target.getRegAltNameIndices();
+ bool hasAltNames = AltNameIndices.size() > 1;
+
O <<
"\n\n/// getRegisterName - This method is automatically generated by tblgen\n"
"/// from the register set description. This returns the assembler name\n"
"/// for the specified register.\n"
- "const char *" << Target.getName() << ClassName
- << "::getRegisterName(unsigned RegNo) {\n"
- << " assert(RegNo && RegNo < " << (Registers.size()+1)
- << " && \"Invalid register number!\");\n"
- << "\n"
- << " static const unsigned RegAsmOffset[] = {";
- for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
- const CodeGenRegister &Reg = Registers[i];
+ "const char *" << Target.getName() << ClassName << "::";
+ if (hasAltNames)
+ O << "\ngetRegisterName(unsigned RegNo, unsigned AltIdx) {\n";
+ else
+ O << "getRegisterName(unsigned RegNo) {\n";
+ O << " assert(RegNo && RegNo < " << (Registers.size()+1)
+ << " && \"Invalid register number!\");\n"
+ << "\n";
- std::string AsmName = Reg.TheDef->getValueAsString("AsmName");
- if (AsmName.empty())
- AsmName = Reg.getName();
-
-
- if ((i % 14) == 0)
- O << "\n ";
-
- O << StringTable.GetOrAddStringOffset(AsmName) << ", ";
+ if (hasAltNames) {
+ for (unsigned i = 0, e = AltNameIndices.size(); i < e; ++i)
+ emitRegisterNameString(O, AltNameIndices[i]->getName(), Registers);
+ } else
+ emitRegisterNameString(O, "", Registers);
+
+ if (hasAltNames) {
+ O << " const unsigned *RegAsmOffset;\n"
+ << " const char *AsmStrs;\n"
+ << " switch(AltIdx) {\n"
+ << " default: assert(0 && \"Invalid register alt name index!\");\n";
+ for (unsigned i = 0, e = AltNameIndices.size(); i < e; ++i) {
+ StringRef Namespace = AltNameIndices[1]->getValueAsString("Namespace");
+ StringRef AltName(AltNameIndices[i]->getName());
+ O << " case " << Namespace << "::" << AltName
+ << ":\n"
+ << " AsmStrs = AsmStrs" << AltName << ";\n"
+ << " RegAsmOffset = RegAsmOffset" << AltName << ";\n"
+ << " break;\n";
+ }
+ O << "}\n";
}
- O << "0\n"
- << " };\n"
- << "\n";
-
- O << " const char *AsmStrs =\n";
- StringTable.EmitString(O);
- O << ";\n";
-
- O << " return AsmStrs+RegAsmOffset[RegNo-1];\n"
+
+ O << " assert (*(AsmStrs+RegAsmOffset[RegNo-1]) &&\n"
+ << " \"Invalid alt name index for register!\");\n"
+ << " return AsmStrs+RegAsmOffset[RegNo-1];\n"
<< "}\n";
}
void AsmWriterEmitter::EmitGetInstructionName(raw_ostream &O) {
- CodeGenTarget Target;
+ CodeGenTarget Target(Records);
Record *AsmWriter = Target.getAsmWriter();
std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
const std::vector<const CodeGenInstruction*> &NumberedInstructions =
Target.getInstructionsByEnumValue();
-
+
StringToOffsetTable StringTable;
O <<
"\n\n#ifdef GET_INSTRUCTION_NAME\n"
<< " static const unsigned InstAsmOffset[] = {";
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
const CodeGenInstruction &Inst = *NumberedInstructions[i];
-
+
std::string AsmName = Inst.TheDef->getName();
if ((i % 14) == 0)
O << "\n ";
-
+
O << StringTable.GetOrAddStringOffset(AsmName) << ", ";
}
O << "0\n"
<< " };\n"
<< "\n";
-
+
O << " const char *Strs =\n";
StringTable.EmitString(O);
O << ";\n";
-
+
O << " return Strs+InstAsmOffset[Opcode];\n"
<< "}\n\n#endif\n";
}
+namespace {
+
+/// SubtargetFeatureInfo - Helper class for storing information on a subtarget
+/// feature which participates in instruction matching.
+struct SubtargetFeatureInfo {
+ /// \brief The predicate record for this feature.
+ const Record *TheDef;
+
+ /// \brief An unique index assigned to represent this feature.
+ unsigned Index;
+
+ SubtargetFeatureInfo(const Record *D, unsigned Idx) : TheDef(D), Index(Idx) {}
+
+ /// \brief The name of the enumerated constant identifying this feature.
+ std::string getEnumName() const {
+ return "Feature_" + TheDef->getName();
+ }
+};
+
+struct AsmWriterInfo {
+ /// Map of Predicate records to their subtarget information.
+ std::map<const Record*, SubtargetFeatureInfo*> SubtargetFeatures;
+
+ /// getSubtargetFeature - Lookup or create the subtarget feature info for the
+ /// given operand.
+ SubtargetFeatureInfo *getSubtargetFeature(const Record *Def) const {
+ assert(Def->isSubClassOf("Predicate") && "Invalid predicate type!");
+ std::map<const Record*, SubtargetFeatureInfo*>::const_iterator I =
+ SubtargetFeatures.find(Def);
+ return I == SubtargetFeatures.end() ? 0 : I->second;
+ }
+
+ void addReqFeatures(const std::vector<Record*> &Features) {
+ for (std::vector<Record*>::const_iterator
+ I = Features.begin(), E = Features.end(); I != E; ++I) {
+ const Record *Pred = *I;
+
+ // Ignore predicates that are not intended for the assembler.
+ if (!Pred->getValueAsBit("AssemblerMatcherPredicate"))
+ continue;
+
+ if (Pred->getName().empty())
+ throw TGError(Pred->getLoc(), "Predicate has no name!");
+
+ // Don't add the predicate again.
+ if (getSubtargetFeature(Pred))
+ continue;
+
+ unsigned FeatureNo = SubtargetFeatures.size();
+ SubtargetFeatures[Pred] = new SubtargetFeatureInfo(Pred, FeatureNo);
+ assert(FeatureNo < 32 && "Too many subtarget features!");
+ }
+ }
+
+ const SubtargetFeatureInfo *getFeatureInfo(const Record *R) {
+ return SubtargetFeatures[R];
+ }
+};
+
+// IAPrinter - Holds information about an InstAlias. Two InstAliases match if
+// they both have the same conditionals. In which case, we cannot print out the
+// alias for that pattern.
+class IAPrinter {
+ AsmWriterInfo &AWI;
+ std::vector<std::string> Conds;
+ std::map<StringRef, unsigned> OpMap;
+ std::string Result;
+ std::string AsmString;
+ std::vector<Record*> ReqFeatures;
+public:
+ IAPrinter(AsmWriterInfo &Info, std::string R, std::string AS)
+ : AWI(Info), Result(R), AsmString(AS) {}
+
+ void addCond(const std::string &C) { Conds.push_back(C); }
+ void addReqFeatures(const std::vector<Record*> &Features) {
+ AWI.addReqFeatures(Features);
+ ReqFeatures = Features;
+ }
+
+ void addOperand(StringRef Op, unsigned Idx) { OpMap[Op] = Idx; }
+ unsigned getOpIndex(StringRef Op) { return OpMap[Op]; }
+ bool isOpMapped(StringRef Op) { return OpMap.find(Op) != OpMap.end(); }
+
+ bool print(raw_ostream &O) {
+ if (Conds.empty() && ReqFeatures.empty()) {
+ O.indent(6) << "return true;\n";
+ return false;
+ }
+
+ O << "if (";
+
+ for (std::vector<std::string>::iterator
+ I = Conds.begin(), E = Conds.end(); I != E; ++I) {
+ if (I != Conds.begin()) {
+ O << " &&\n";
+ O.indent(8);
+ }
+
+ O << *I;
+ }
+
+ if (!ReqFeatures.empty()) {
+ if (Conds.begin() != Conds.end()) {
+ O << " &&\n";
+ O.indent(8);
+ } else {
+ O << "if (";
+ }
+
+ std::string Req;
+ raw_string_ostream ReqO(Req);
+
+ for (std::vector<Record*>::iterator
+ I = ReqFeatures.begin(), E = ReqFeatures.end(); I != E; ++I) {
+ if (I != ReqFeatures.begin()) ReqO << " | ";
+ ReqO << AWI.getFeatureInfo(*I)->getEnumName();
+ }
+
+ O << "(AvailableFeatures & (" << ReqO.str() << ")) == ("
+ << ReqO.str() << ')';
+ }
+
+ O << ") {\n";
+ O.indent(6) << "// " << Result << "\n";
+ O.indent(6) << "AsmString = \"" << AsmString << "\";\n";
+
+ for (std::map<StringRef, unsigned>::iterator
+ I = OpMap.begin(), E = OpMap.end(); I != E; ++I)
+ O.indent(6) << "OpMap.push_back(std::make_pair(\"" << I->first << "\", "
+ << I->second << "));\n";
+
+ O.indent(6) << "break;\n";
+ O.indent(4) << '}';
+ return !ReqFeatures.empty();
+ }
+
+ bool operator==(const IAPrinter &RHS) {
+ if (Conds.size() != RHS.Conds.size())
+ return false;
+
+ unsigned Idx = 0;
+ for (std::vector<std::string>::iterator
+ I = Conds.begin(), E = Conds.end(); I != E; ++I)
+ if (*I != RHS.Conds[Idx++])
+ return false;
+
+ return true;
+ }
+
+ bool operator()(const IAPrinter &RHS) {
+ if (Conds.size() < RHS.Conds.size())
+ return true;
+
+ unsigned Idx = 0;
+ for (std::vector<std::string>::iterator
+ I = Conds.begin(), E = Conds.end(); I != E; ++I)
+ if (*I != RHS.Conds[Idx++])
+ return *I < RHS.Conds[Idx++];
+
+ return false;
+ }
+};
+
+} // end anonymous namespace
+
+/// EmitSubtargetFeatureFlagEnumeration - Emit the subtarget feature flag
+/// definitions.
+static void EmitSubtargetFeatureFlagEnumeration(AsmWriterInfo &Info,
+ raw_ostream &O) {
+ O << "namespace {\n\n";
+ O << "// Flags for subtarget features that participate in "
+ << "alias instruction matching.\n";
+ O << "enum SubtargetFeatureFlag {\n";
+
+ for (std::map<const Record*, SubtargetFeatureInfo*>::const_iterator
+ I = Info.SubtargetFeatures.begin(),
+ E = Info.SubtargetFeatures.end(); I != E; ++I) {
+ SubtargetFeatureInfo &SFI = *I->second;
+ O << " " << SFI.getEnumName() << " = (1 << " << SFI.Index << "),\n";
+ }
+
+ O << " Feature_None = 0\n";
+ O << "};\n\n";
+ O << "} // end anonymous namespace\n\n";
+}
+
+/// EmitComputeAvailableFeatures - Emit the function to compute the list of
+/// available features given a subtarget.
+static void EmitComputeAvailableFeatures(AsmWriterInfo &Info,
+ Record *AsmWriter,
+ CodeGenTarget &Target,
+ raw_ostream &O) {
+ std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
+
+ O << "unsigned " << Target.getName() << ClassName << "::\n"
+ << "ComputeAvailableFeatures(const " << Target.getName()
+ << "Subtarget *Subtarget) const {\n";
+ O << " unsigned Features = 0;\n";
+
+ for (std::map<const Record*, SubtargetFeatureInfo*>::const_iterator
+ I = Info.SubtargetFeatures.begin(),
+ E = Info.SubtargetFeatures.end(); I != E; ++I) {
+ SubtargetFeatureInfo &SFI = *I->second;
+ O << " if (" << SFI.TheDef->getValueAsString("CondString")
+ << ")\n";
+ O << " Features |= " << SFI.getEnumName() << ";\n";
+ }
+
+ O << " return Features;\n";
+ O << "}\n\n";
+}
+
+static void EmitGetMapOperandNumber(raw_ostream &O) {
+ O << "static unsigned getMapOperandNumber("
+ << "const SmallVectorImpl<std::pair<StringRef, unsigned> > &OpMap,\n";
+ O << " StringRef Name) {\n";
+ O << " for (SmallVectorImpl<std::pair<StringRef, unsigned> >::"
+ << "const_iterator\n";
+ O << " I = OpMap.begin(), E = OpMap.end(); I != E; ++I)\n";
+ O << " if (I->first == Name)\n";
+ O << " return I->second;\n";
+ O << " assert(false && \"Operand not in map!\");\n";
+ O << " return 0;\n";
+ O << "}\n\n";
+}
+
+void AsmWriterEmitter::EmitRegIsInRegClass(raw_ostream &O) {
+ CodeGenTarget Target(Records);
+
+ // Enumerate the register classes.
+ const std::vector<CodeGenRegisterClass> &RegisterClasses =
+ Target.getRegisterClasses();
+
+ O << "namespace { // Register classes\n";
+ O << " enum RegClass {\n";
+
+ // Emit the register enum value for each RegisterClass.
+ for (unsigned I = 0, E = RegisterClasses.size(); I != E; ++I) {
+ if (I != 0) O << ",\n";
+ O << " RC_" << RegisterClasses[I].TheDef->getName();
+ }
+
+ O << "\n };\n";
+ O << "} // end anonymous namespace\n\n";
+
+ // Emit a function that returns 'true' if a regsiter is part of a particular
+ // register class. I.e., RAX is part of GR64 on X86.
+ O << "static bool regIsInRegisterClass"
+ << "(unsigned RegClass, unsigned Reg) {\n";
+
+ // Emit the switch that checks if a register belongs to a particular register
+ // class.
+ O << " switch (RegClass) {\n";
+ O << " default: break;\n";
+
+ for (unsigned I = 0, E = RegisterClasses.size(); I != E; ++I) {
+ const CodeGenRegisterClass &RC = RegisterClasses[I];
+
+ // Give the register class a legal C name if it's anonymous.
+ std::string Name = RC.TheDef->getName();
+ O << " case RC_" << Name << ":\n";
+
+ // Emit the register list now.
+ unsigned IE = RC.getOrder().size();
+ if (IE == 1) {
+ O << " if (Reg == " << getQualifiedName(RC.getOrder()[0]) << ")\n";
+ O << " return true;\n";
+ } else {
+ O << " switch (Reg) {\n";
+ O << " default: break;\n";
+
+ for (unsigned II = 0; II != IE; ++II) {
+ Record *Reg = RC.getOrder()[II];
+ O << " case " << getQualifiedName(Reg) << ":\n";
+ }
+
+ O << " return true;\n";
+ O << " }\n";
+ }
+
+ O << " break;\n";
+ }
+
+ O << " }\n\n";
+ O << " return false;\n";
+ O << "}\n\n";
+}
+
+static unsigned CountNumOperands(StringRef AsmString) {
+ unsigned NumOps = 0;
+ std::pair<StringRef, StringRef> ASM = AsmString.split(' ');
+
+ while (!ASM.second.empty()) {
+ ++NumOps;
+ ASM = ASM.second.split(' ');
+ }
+
+ return NumOps;
+}
+
+static unsigned CountResultNumOperands(StringRef AsmString) {
+ unsigned NumOps = 0;
+ std::pair<StringRef, StringRef> ASM = AsmString.split('\t');
+
+ if (!ASM.second.empty()) {
+ size_t I = ASM.second.find('{');
+ StringRef Str = ASM.second;
+ if (I != StringRef::npos)
+ Str = ASM.second.substr(I, ASM.second.find('|', I));
+
+ ASM = Str.split(' ');
+
+ do {
+ ++NumOps;
+ ASM = ASM.second.split(' ');
+ } while (!ASM.second.empty());
+ }
+
+ return NumOps;
+}
+
+void AsmWriterEmitter::EmitPrintAliasInstruction(raw_ostream &O) {
+ CodeGenTarget Target(Records);
+ Record *AsmWriter = Target.getAsmWriter();
+
+ if (!AsmWriter->getValueAsBit("isMCAsmWriter"))
+ return;
+
+ O << "\n#ifdef PRINT_ALIAS_INSTR\n";
+ O << "#undef PRINT_ALIAS_INSTR\n\n";
+
+ EmitRegIsInRegClass(O);
+
+ // Emit the method that prints the alias instruction.
+ std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
+
+ std::vector<Record*> AllInstAliases =
+ Records.getAllDerivedDefinitions("InstAlias");
+
+ // Create a map from the qualified name to a list of potential matches.
+ std::map<std::string, std::vector<CodeGenInstAlias*> > AliasMap;
+ for (std::vector<Record*>::iterator
+ I = AllInstAliases.begin(), E = AllInstAliases.end(); I != E; ++I) {
+ CodeGenInstAlias *Alias = new CodeGenInstAlias(*I, Target);
+ const Record *R = *I;
+ if (!R->getValueAsBit("EmitAlias"))
+ continue; // We were told not to emit the alias, but to emit the aliasee.
+ const DagInit *DI = R->getValueAsDag("ResultInst");
+ const DefInit *Op = dynamic_cast<const DefInit*>(DI->getOperator());
+ AliasMap[getQualifiedName(Op->getDef())].push_back(Alias);
+ }
+
+ // A map of which conditions need to be met for each instruction operand
+ // before it can be matched to the mnemonic.
+ std::map<std::string, std::vector<IAPrinter*> > IAPrinterMap;
+ AsmWriterInfo AWI;
+
+ for (std::map<std::string, std::vector<CodeGenInstAlias*> >::iterator
+ I = AliasMap.begin(), E = AliasMap.end(); I != E; ++I) {
+ std::vector<CodeGenInstAlias*> &Aliases = I->second;
+
+ for (std::vector<CodeGenInstAlias*>::iterator
+ II = Aliases.begin(), IE = Aliases.end(); II != IE; ++II) {
+ const CodeGenInstAlias *CGA = *II;
+ unsigned LastOpNo = CGA->ResultInstOperandIndex.size();
+ unsigned NumResultOps =
+ CountResultNumOperands(CGA->ResultInst->AsmString);
+ // Don't emit the alias if it has more operands than what it's aliasing.
+ if (NumResultOps < CountNumOperands(CGA->AsmString))
+ continue;
+
+ IAPrinter *IAP = new IAPrinter(AWI, CGA->Result->getAsString(),
+ CGA->AsmString);
+ IAP->addReqFeatures(CGA->TheDef->getValueAsListOfDefs("Predicates"));
+
+ std::string Cond;
+ Cond = std::string("MI->getNumOperands() == ") + llvm::utostr(LastOpNo);
+ IAP->addCond(Cond);
+
+ std::map<StringRef, unsigned> OpMap;
+ bool CantHandle = false;
+
+ for (unsigned i = 0, e = LastOpNo; i != e; ++i) {
+ const CodeGenInstAlias::ResultOperand &RO = CGA->ResultOperands[i];
+
+ switch (RO.Kind) {
+ default: assert(0 && "unexpected InstAlias operand kind");
+ case CodeGenInstAlias::ResultOperand::K_Record: {
+ const Record *Rec = RO.getRecord();
+ StringRef ROName = RO.getName();
+
+
+ if (Rec->isSubClassOf("RegisterOperand"))
+ Rec = Rec->getValueAsDef("RegClass");
+ if (Rec->isSubClassOf("RegisterClass")) {
+ Cond = std::string("MI->getOperand(")+llvm::utostr(i)+").isReg()";
+ IAP->addCond(Cond);
+
+ if (!IAP->isOpMapped(ROName)) {
+ IAP->addOperand(ROName, i);
+ Cond = std::string("regIsInRegisterClass(RC_") +
+ CGA->ResultOperands[i].getRecord()->getName() +
+ ", MI->getOperand(" + llvm::utostr(i) + ").getReg())";
+ IAP->addCond(Cond);
+ } else {
+ Cond = std::string("MI->getOperand(") +
+ llvm::utostr(i) + ").getReg() == MI->getOperand(" +
+ llvm::utostr(IAP->getOpIndex(ROName)) + ").getReg()";
+ IAP->addCond(Cond);
+ }
+ } else {
+ assert(Rec->isSubClassOf("Operand") && "Unexpected operand!");
+ // FIXME: We may need to handle these situations.
+ delete IAP;
+ IAP = 0;
+ CantHandle = true;
+ break;
+ }
+
+ break;
+ }
+ case CodeGenInstAlias::ResultOperand::K_Imm:
+ Cond = std::string("MI->getOperand(") +
+ llvm::utostr(i) + ").getImm() == " +
+ llvm::utostr(CGA->ResultOperands[i].getImm());
+ IAP->addCond(Cond);
+ break;
+ case CodeGenInstAlias::ResultOperand::K_Reg:
+ Cond = std::string("MI->getOperand(") +
+ llvm::utostr(i) + ").getReg() == " + Target.getName() +
+ "::" + CGA->ResultOperands[i].getRegister()->getName();
+ IAP->addCond(Cond);
+ break;
+ }
+
+ if (!IAP) break;
+ }
+
+ if (CantHandle) continue;
+ IAPrinterMap[I->first].push_back(IAP);
+ }
+ }
+
+ EmitSubtargetFeatureFlagEnumeration(AWI, O);
+ EmitComputeAvailableFeatures(AWI, AsmWriter, Target, O);
+
+ std::string Header;
+ raw_string_ostream HeaderO(Header);
+
+ HeaderO << "bool " << Target.getName() << ClassName
+ << "::printAliasInstr(const MCInst"
+ << " *MI, raw_ostream &OS) {\n";
+
+ std::string Cases;
+ raw_string_ostream CasesO(Cases);
+ bool NeedAvailableFeatures = false;
+
+ for (std::map<std::string, std::vector<IAPrinter*> >::iterator
+ I = IAPrinterMap.begin(), E = IAPrinterMap.end(); I != E; ++I) {
+ std::vector<IAPrinter*> &IAPs = I->second;
+ std::vector<IAPrinter*> UniqueIAPs;
+
+ for (std::vector<IAPrinter*>::iterator
+ II = IAPs.begin(), IE = IAPs.end(); II != IE; ++II) {
+ IAPrinter *LHS = *II;
+ bool IsDup = false;
+ for (std::vector<IAPrinter*>::iterator
+ III = IAPs.begin(), IIE = IAPs.end(); III != IIE; ++III) {
+ IAPrinter *RHS = *III;
+ if (LHS != RHS && *LHS == *RHS) {
+ IsDup = true;
+ break;
+ }
+ }
+
+ if (!IsDup) UniqueIAPs.push_back(LHS);
+ }
+
+ if (UniqueIAPs.empty()) continue;
+
+ CasesO.indent(2) << "case " << I->first << ":\n";
+
+ for (std::vector<IAPrinter*>::iterator
+ II = UniqueIAPs.begin(), IE = UniqueIAPs.end(); II != IE; ++II) {
+ IAPrinter *IAP = *II;
+ CasesO.indent(4);
+ NeedAvailableFeatures |= IAP->print(CasesO);
+ CasesO << '\n';
+ }
+
+ CasesO.indent(4) << "return false;\n";
+ }
+
+ if (CasesO.str().empty()) {
+ O << HeaderO.str();
+ O << " return false;\n";
+ O << "}\n\n";
+ O << "#endif // PRINT_ALIAS_INSTR\n";
+ return;
+ }
+
+ EmitGetMapOperandNumber(O);
+
+ O << HeaderO.str();
+ O.indent(2) << "StringRef AsmString;\n";
+ O.indent(2) << "SmallVector<std::pair<StringRef, unsigned>, 4> OpMap;\n";
+ if (NeedAvailableFeatures)
+ O.indent(2) << "unsigned AvailableFeatures = getAvailableFeatures();\n\n";
+ O.indent(2) << "switch (MI->getOpcode()) {\n";
+ O.indent(2) << "default: return false;\n";
+ O << CasesO.str();
+ O.indent(2) << "}\n\n";
+
+ // Code that prints the alias, replacing the operands with the ones from the
+ // MCInst.
+ O << " std::pair<StringRef, StringRef> ASM = AsmString.split(' ');\n";
+ O << " OS << '\\t' << ASM.first;\n";
+
+ O << " if (!ASM.second.empty()) {\n";
+ O << " OS << '\\t';\n";
+ O << " for (StringRef::iterator\n";
+ O << " I = ASM.second.begin(), E = ASM.second.end(); I != E; ) {\n";
+ O << " if (*I == '$') {\n";
+ O << " StringRef::iterator Start = ++I;\n";
+ O << " while (I != E &&\n";
+ O << " ((*I >= 'a' && *I <= 'z') ||\n";
+ O << " (*I >= 'A' && *I <= 'Z') ||\n";
+ O << " (*I >= '0' && *I <= '9') ||\n";
+ O << " *I == '_'))\n";
+ O << " ++I;\n";
+ O << " StringRef Name(Start, I - Start);\n";
+ O << " printOperand(MI, getMapOperandNumber(OpMap, Name), OS);\n";
+ O << " } else {\n";
+ O << " OS << *I++;\n";
+ O << " }\n";
+ O << " }\n";
+ O << " }\n\n";
+
+ O << " return true;\n";
+ O << "}\n\n";
+
+ O << "#endif // PRINT_ALIAS_INSTR\n";
+}
void AsmWriterEmitter::run(raw_ostream &O) {
EmitSourceFileHeader("Assembly Writer Source Fragment", O);
-
+
EmitPrintInstruction(O);
EmitGetRegisterName(O);
EmitGetInstructionName(O);
+ EmitPrintAliasInstruction(O);
}
projects / oota-llvm.git / blobdiff