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89 lines
3.3 KiB
89 lines
3.3 KiB
//===========- OpenMPCommonGen.cpp - OpenMP common info generator -===========//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// OpenMPCommonGen generates utility information from the single OpenMP source
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// of truth in llvm/lib/Frontend/OpenMP.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/TableGen/GenInfo.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TableGen/DirectiveEmitter.h"
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#include "llvm/TableGen/Record.h"
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using llvm::Clause;
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using llvm::ClauseVal;
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using llvm::raw_ostream;
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using llvm::RecordKeeper;
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using llvm::Twine;
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// LLVM has multiple places (Clang, Flang, MLIR) where information about
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// the OpenMP directives, and clauses are needed. It is good software
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// engineering to keep the common information in a single place to avoid
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// duplication, reduce engineering effort and prevent mistakes.
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// Currently that common place is llvm/include/llvm/Frontend/OpenMP/OMP.td.
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// We plan to use this tablegen source to generate all the required
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// declarations, functions etc.
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//
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// Some OpenMP clauses accept only a fixed set of values as inputs. These
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// can be represented as a String Enum Attribute (StrEnumAttr) in MLIR ODS.
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// The emitDecls function below currently generates these enumerations. The
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// name of the enumeration is specified in the enumClauseValue field of
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// Clause record in OMP.td. This name can be used to specify the type of the
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// OpenMP operation's operand. The allowedClauseValues field provides the list
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// of ClauseValues which are part of the enumeration.
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static bool emitDecls(const RecordKeeper &recordKeeper, raw_ostream &os) {
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const auto &clauses = recordKeeper.getAllDerivedDefinitions("Clause");
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for (const auto &r : clauses) {
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Clause c{r};
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const auto &clauseVals = c.getClauseVals();
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if (clauseVals.size() <= 0)
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continue;
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const auto enumName = c.getEnumName();
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assert(enumName.size() != 0 && "enumClauseValue field not set.");
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std::vector<std::string> cvDefs;
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for (const auto &cv : clauseVals) {
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ClauseVal cval{cv};
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if (!cval.isUserVisible())
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continue;
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const auto name = cval.getFormattedName();
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std::string cvDef{(enumName + llvm::Twine(name)).str()};
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os << "def " << cvDef << " : StrEnumAttrCase<\"" << name << "\">;\n";
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cvDefs.push_back(cvDef);
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}
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os << "def " << enumName << ": StrEnumAttr<\n";
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os << " \"Clause" << enumName << "\",\n";
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os << " \"" << enumName << " Clause\",\n";
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os << " [";
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for (unsigned int i = 0; i < cvDefs.size(); i++) {
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os << cvDefs[i];
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if (i != cvDefs.size() - 1)
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os << ",";
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}
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os << "]> {\n";
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os << " let cppNamespace = \"::mlir::omp\";\n";
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os << "}\n";
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}
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return false;
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}
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// Registers the generator to mlir-tblgen.
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static mlir::GenRegistration
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genDirectiveDecls("gen-directive-decl",
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"Generate declarations for directives (OpenMP etc.)",
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[](const RecordKeeper &records, raw_ostream &os) {
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return emitDecls(records, os);
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});
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