--- /dev/null
+//===- SetTheory.cpp - Generate ordered sets from DAG expressions ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SetTheory class that computes ordered sets of
+// Records from DAG expressions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Format.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+#include "llvm/TableGen/SetTheory.h"
+
+using namespace llvm;
+
+// Define the standard operators.
+namespace {
+
+typedef SetTheory::RecSet RecSet;
+typedef SetTheory::RecVec RecVec;
+
+// (add a, b, ...) Evaluate and union all arguments.
+struct AddOp : public SetTheory::Operator {
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ ST.evaluate(Expr->arg_begin(), Expr->arg_end(), Elts, Loc);
+ }
+};
+
+// (sub Add, Sub, ...) Set difference.
+struct SubOp : public SetTheory::Operator {
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ if (Expr->arg_size() < 2)
+ PrintFatalError(Loc, "Set difference needs at least two arguments: " +
+ Expr->getAsString());
+ RecSet Add, Sub;
+ ST.evaluate(*Expr->arg_begin(), Add, Loc);
+ ST.evaluate(Expr->arg_begin() + 1, Expr->arg_end(), Sub, Loc);
+ for (RecSet::iterator I = Add.begin(), E = Add.end(); I != E; ++I)
+ if (!Sub.count(*I))
+ Elts.insert(*I);
+ }
+};
+
+// (and S1, S2) Set intersection.
+struct AndOp : public SetTheory::Operator {
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ if (Expr->arg_size() != 2)
+ PrintFatalError(Loc, "Set intersection requires two arguments: " +
+ Expr->getAsString());
+ RecSet S1, S2;
+ ST.evaluate(Expr->arg_begin()[0], S1, Loc);
+ ST.evaluate(Expr->arg_begin()[1], S2, Loc);
+ for (RecSet::iterator I = S1.begin(), E = S1.end(); I != E; ++I)
+ if (S2.count(*I))
+ Elts.insert(*I);
+ }
+};
+
+// SetIntBinOp - Abstract base class for (Op S, N) operators.
+struct SetIntBinOp : public SetTheory::Operator {
+ virtual void apply2(SetTheory &ST, DagInit *Expr, RecSet &Set, int64_t N,
+ RecSet &Elts, ArrayRef<SMLoc> Loc) = 0;
+
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ if (Expr->arg_size() != 2)
+ PrintFatalError(Loc, "Operator requires (Op Set, Int) arguments: " +
+ Expr->getAsString());
+ RecSet Set;
+ ST.evaluate(Expr->arg_begin()[0], Set, Loc);
+ IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[1]);
+ if (!II)
+ PrintFatalError(Loc, "Second argument must be an integer: " +
+ Expr->getAsString());
+ apply2(ST, Expr, Set, II->getValue(), Elts, Loc);
+ }
+};
+
+// (shl S, N) Shift left, remove the first N elements.
+struct ShlOp : public SetIntBinOp {
+ void apply2(SetTheory &ST, DagInit *Expr, RecSet &Set, int64_t N,
+ RecSet &Elts, ArrayRef<SMLoc> Loc) override {
+ if (N < 0)
+ PrintFatalError(Loc, "Positive shift required: " +
+ Expr->getAsString());
+ if (unsigned(N) < Set.size())
+ Elts.insert(Set.begin() + N, Set.end());
+ }
+};
+
+// (trunc S, N) Truncate after the first N elements.
+struct TruncOp : public SetIntBinOp {
+ void apply2(SetTheory &ST, DagInit *Expr, RecSet &Set, int64_t N,
+ RecSet &Elts, ArrayRef<SMLoc> Loc) override {
+ if (N < 0)
+ PrintFatalError(Loc, "Positive length required: " +
+ Expr->getAsString());
+ if (unsigned(N) > Set.size())
+ N = Set.size();
+ Elts.insert(Set.begin(), Set.begin() + N);
+ }
+};
+
+// Left/right rotation.
+struct RotOp : public SetIntBinOp {
+ const bool Reverse;
+
+ RotOp(bool Rev) : Reverse(Rev) {}
+
+ void apply2(SetTheory &ST, DagInit *Expr, RecSet &Set, int64_t N,
+ RecSet &Elts, ArrayRef<SMLoc> Loc) override {
+ if (Reverse)
+ N = -N;
+ // N > 0 -> rotate left, N < 0 -> rotate right.
+ if (Set.empty())
+ return;
+ if (N < 0)
+ N = Set.size() - (-N % Set.size());
+ else
+ N %= Set.size();
+ Elts.insert(Set.begin() + N, Set.end());
+ Elts.insert(Set.begin(), Set.begin() + N);
+ }
+};
+
+// (decimate S, N) Pick every N'th element of S.
+struct DecimateOp : public SetIntBinOp {
+ void apply2(SetTheory &ST, DagInit *Expr, RecSet &Set, int64_t N,
+ RecSet &Elts, ArrayRef<SMLoc> Loc) override {
+ if (N <= 0)
+ PrintFatalError(Loc, "Positive stride required: " +
+ Expr->getAsString());
+ for (unsigned I = 0; I < Set.size(); I += N)
+ Elts.insert(Set[I]);
+ }
+};
+
+// (interleave S1, S2, ...) Interleave elements of the arguments.
+struct InterleaveOp : public SetTheory::Operator {
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ // Evaluate the arguments individually.
+ SmallVector<RecSet, 4> Args(Expr->getNumArgs());
+ unsigned MaxSize = 0;
+ for (unsigned i = 0, e = Expr->getNumArgs(); i != e; ++i) {
+ ST.evaluate(Expr->getArg(i), Args[i], Loc);
+ MaxSize = std::max(MaxSize, unsigned(Args[i].size()));
+ }
+ // Interleave arguments into Elts.
+ for (unsigned n = 0; n != MaxSize; ++n)
+ for (unsigned i = 0, e = Expr->getNumArgs(); i != e; ++i)
+ if (n < Args[i].size())
+ Elts.insert(Args[i][n]);
+ }
+};
+
+// (sequence "Format", From, To) Generate a sequence of records by name.
+struct SequenceOp : public SetTheory::Operator {
+ void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts,
+ ArrayRef<SMLoc> Loc) override {
+ int Step = 1;
+ if (Expr->arg_size() > 4)
+ PrintFatalError(Loc, "Bad args to (sequence \"Format\", From, To): " +
+ Expr->getAsString());
+ else if (Expr->arg_size() == 4) {
+ if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[3])) {
+ Step = II->getValue();
+ } else
+ PrintFatalError(Loc, "Stride must be an integer: " +
+ Expr->getAsString());
+ }
+
+ std::string Format;
+ if (StringInit *SI = dyn_cast<StringInit>(Expr->arg_begin()[0]))
+ Format = SI->getValue();
+ else
+ PrintFatalError(Loc, "Format must be a string: " + Expr->getAsString());
+
+ int64_t From, To;
+ if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[1]))
+ From = II->getValue();
+ else
+ PrintFatalError(Loc, "From must be an integer: " + Expr->getAsString());
+ if (From < 0 || From >= (1 << 30))
+ PrintFatalError(Loc, "From out of range");
+
+ if (IntInit *II = dyn_cast<IntInit>(Expr->arg_begin()[2]))
+ To = II->getValue();
+ else
+ PrintFatalError(Loc, "From must be an integer: " + Expr->getAsString());
+ if (To < 0 || To >= (1 << 30))
+ PrintFatalError(Loc, "To out of range");
+
+ RecordKeeper &Records =
+ cast<DefInit>(Expr->getOperator())->getDef()->getRecords();
+
+ Step *= From <= To ? 1 : -1;
+ while (true) {
+ if (Step > 0 && From > To)
+ break;
+ else if (Step < 0 && From < To)
+ break;
+ std::string Name;
+ raw_string_ostream OS(Name);
+ OS << format(Format.c_str(), unsigned(From));
+ Record *Rec = Records.getDef(OS.str());
+ if (!Rec)
+ PrintFatalError(Loc, "No def named '" + Name + "': " +
+ Expr->getAsString());
+ // Try to reevaluate Rec in case it is a set.
+ if (const RecVec *Result = ST.expand(Rec))
+ Elts.insert(Result->begin(), Result->end());
+ else
+ Elts.insert(Rec);
+
+ From += Step;
+ }
+ }
+};
+
+// Expand a Def into a set by evaluating one of its fields.
+struct FieldExpander : public SetTheory::Expander {
+ StringRef FieldName;
+
+ FieldExpander(StringRef fn) : FieldName(fn) {}
+
+ void expand(SetTheory &ST, Record *Def, RecSet &Elts) override {
+ ST.evaluate(Def->getValueInit(FieldName), Elts, Def->getLoc());
+ }
+};
+} // end anonymous namespace
+
+// Pin the vtables to this file.
+void SetTheory::Operator::anchor() {}
+void SetTheory::Expander::anchor() {}
+
+
+SetTheory::SetTheory() {
+ addOperator("add", new AddOp);
+ addOperator("sub", new SubOp);
+ addOperator("and", new AndOp);
+ addOperator("shl", new ShlOp);
+ addOperator("trunc", new TruncOp);
+ addOperator("rotl", new RotOp(false));
+ addOperator("rotr", new RotOp(true));
+ addOperator("decimate", new DecimateOp);
+ addOperator("interleave", new InterleaveOp);
+ addOperator("sequence", new SequenceOp);
+}
+
+void SetTheory::addOperator(StringRef Name, Operator *Op) {
+ Operators[Name] = Op;
+}
+
+void SetTheory::addExpander(StringRef ClassName, Expander *E) {
+ Expanders[ClassName] = E;
+}
+
+void SetTheory::addFieldExpander(StringRef ClassName, StringRef FieldName) {
+ addExpander(ClassName, new FieldExpander(FieldName));
+}
+
+void SetTheory::evaluate(Init *Expr, RecSet &Elts, ArrayRef<SMLoc> Loc) {
+ // A def in a list can be a just an element, or it may expand.
+ if (DefInit *Def = dyn_cast<DefInit>(Expr)) {
+ if (const RecVec *Result = expand(Def->getDef()))
+ return Elts.insert(Result->begin(), Result->end());
+ Elts.insert(Def->getDef());
+ return;
+ }
+
+ // Lists simply expand.
+ if (ListInit *LI = dyn_cast<ListInit>(Expr))
+ return evaluate(LI->begin(), LI->end(), Elts, Loc);
+
+ // Anything else must be a DAG.
+ DagInit *DagExpr = dyn_cast<DagInit>(Expr);
+ if (!DagExpr)
+ PrintFatalError(Loc, "Invalid set element: " + Expr->getAsString());
+ DefInit *OpInit = dyn_cast<DefInit>(DagExpr->getOperator());
+ if (!OpInit)
+ PrintFatalError(Loc, "Bad set expression: " + Expr->getAsString());
+ Operator *Op = Operators.lookup(OpInit->getDef()->getName());
+ if (!Op)
+ PrintFatalError(Loc, "Unknown set operator: " + Expr->getAsString());
+ Op->apply(*this, DagExpr, Elts, Loc);
+}
+
+const RecVec *SetTheory::expand(Record *Set) {
+ // Check existing entries for Set and return early.
+ ExpandMap::iterator I = Expansions.find(Set);
+ if (I != Expansions.end())
+ return &I->second;
+
+ // This is the first time we see Set. Find a suitable expander.
+ const std::vector<Record*> &SC = Set->getSuperClasses();
+ for (unsigned i = 0, e = SC.size(); i != e; ++i) {
+ // Skip unnamed superclasses.
+ if (!dyn_cast<StringInit>(SC[i]->getNameInit()))
+ continue;
+ if (Expander *Exp = Expanders.lookup(SC[i]->getName())) {
+ // This breaks recursive definitions.
+ RecVec &EltVec = Expansions[Set];
+ RecSet Elts;
+ Exp->expand(*this, Set, Elts);
+ EltVec.assign(Elts.begin(), Elts.end());
+ return &EltVec;
+ }
+ }
+
+ // Set is not expandable.
+ return nullptr;
+}
+
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