forked from OSchip/llvm-project
556 lines
20 KiB
C++
556 lines
20 KiB
C++
//===- EnumsGen.cpp - MLIR enum utility 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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// EnumsGen generates common utility functions for enums.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/TableGen/Attribute.h"
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#include "mlir/TableGen/Format.h"
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#include "mlir/TableGen/GenInfo.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/FormatVariadic.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/Record.h"
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#include "llvm/TableGen/TableGenBackend.h"
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using llvm::formatv;
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using llvm::isDigit;
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using llvm::PrintFatalError;
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using llvm::raw_ostream;
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using llvm::Record;
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using llvm::RecordKeeper;
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using llvm::StringRef;
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using mlir::tblgen::Attribute;
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using mlir::tblgen::EnumAttr;
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using mlir::tblgen::EnumAttrCase;
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using mlir::tblgen::FmtContext;
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using mlir::tblgen::tgfmt;
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static std::string makeIdentifier(StringRef str) {
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if (!str.empty() && isDigit(static_cast<unsigned char>(str.front()))) {
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std::string newStr = std::string("_") + str.str();
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return newStr;
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}
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return str.str();
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}
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static void emitEnumClass(const Record &enumDef, StringRef enumName,
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StringRef underlyingType, StringRef description,
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const std::vector<EnumAttrCase> &enumerants,
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raw_ostream &os) {
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os << "// " << description << "\n";
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os << "enum class " << enumName;
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if (!underlyingType.empty())
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os << " : " << underlyingType;
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os << " {\n";
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for (const auto &enumerant : enumerants) {
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auto symbol = makeIdentifier(enumerant.getSymbol());
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auto value = enumerant.getValue();
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if (value >= 0) {
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os << formatv(" {0} = {1},\n", symbol, value);
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} else {
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os << formatv(" {0},\n", symbol);
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}
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}
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os << "};\n\n";
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}
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static void emitDenseMapInfo(StringRef enumName, std::string underlyingType,
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StringRef cppNamespace, raw_ostream &os) {
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std::string qualName =
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std::string(formatv("{0}::{1}", cppNamespace, enumName));
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if (underlyingType.empty())
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underlyingType =
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std::string(formatv("std::underlying_type<{0}>::type", qualName));
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const char *const mapInfo = R"(
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namespace llvm {
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template<> struct DenseMapInfo<{0}> {{
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using StorageInfo = ::llvm::DenseMapInfo<{1}>;
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static inline {0} getEmptyKey() {{
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return static_cast<{0}>(StorageInfo::getEmptyKey());
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}
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static inline {0} getTombstoneKey() {{
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return static_cast<{0}>(StorageInfo::getTombstoneKey());
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}
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static unsigned getHashValue(const {0} &val) {{
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return StorageInfo::getHashValue(static_cast<{1}>(val));
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}
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static bool isEqual(const {0} &lhs, const {0} &rhs) {{
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return lhs == rhs;
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}
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};
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})";
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os << formatv(mapInfo, qualName, underlyingType);
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os << "\n\n";
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}
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static void emitMaxValueFn(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef maxEnumValFnName = enumAttr.getMaxEnumValFnName();
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auto enumerants = enumAttr.getAllCases();
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unsigned maxEnumVal = 0;
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for (const auto &enumerant : enumerants) {
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int64_t value = enumerant.getValue();
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// Avoid generating the max value function if there is an enumerant without
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// explicit value.
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if (value < 0)
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return;
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maxEnumVal = std::max(maxEnumVal, static_cast<unsigned>(value));
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}
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// Emit the function to return the max enum value
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os << formatv("inline constexpr unsigned {0}() {{\n", maxEnumValFnName);
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os << formatv(" return {0};\n", maxEnumVal);
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os << "}\n\n";
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}
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// Returns the EnumAttrCase whose value is zero if exists; returns llvm::None
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// otherwise.
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static llvm::Optional<EnumAttrCase>
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getAllBitsUnsetCase(llvm::ArrayRef<EnumAttrCase> cases) {
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for (auto attrCase : cases) {
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if (attrCase.getValue() == 0)
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return attrCase;
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}
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return llvm::None;
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}
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// Emits the following inline function for bit enums:
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//
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// inline <enum-type> operator|(<enum-type> a, <enum-type> b);
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// inline <enum-type> operator&(<enum-type> a, <enum-type> b);
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// inline <enum-type> bitEnumContains(<enum-type> a, <enum-type> b);
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static void emitOperators(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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std::string underlyingType = std::string(enumAttr.getUnderlyingType());
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os << formatv("inline {0} operator|({0} lhs, {0} rhs) {{\n", enumName)
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<< formatv(" return static_cast<{0}>("
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"static_cast<{1}>(lhs) | static_cast<{1}>(rhs));\n",
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enumName, underlyingType)
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<< "}\n";
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os << formatv("inline {0} operator&({0} lhs, {0} rhs) {{\n", enumName)
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<< formatv(" return static_cast<{0}>("
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"static_cast<{1}>(lhs) & static_cast<{1}>(rhs));\n",
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enumName, underlyingType)
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<< "}\n";
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os << formatv(
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"inline bool bitEnumContains({0} bits, {0} bit) {{\n"
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" return (static_cast<{1}>(bits) & static_cast<{1}>(bit)) != 0;\n",
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enumName, underlyingType)
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<< "}\n";
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}
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static void emitSymToStrFnForIntEnum(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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StringRef symToStrFnName = enumAttr.getSymbolToStringFnName();
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StringRef symToStrFnRetType = enumAttr.getSymbolToStringFnRetType();
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auto enumerants = enumAttr.getAllCases();
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os << formatv("{2} {1}({0} val) {{\n", enumName, symToStrFnName,
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symToStrFnRetType);
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os << " switch (val) {\n";
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for (const auto &enumerant : enumerants) {
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auto symbol = enumerant.getSymbol();
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auto str = enumerant.getStr();
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os << formatv(" case {0}::{1}: return \"{2}\";\n", enumName,
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makeIdentifier(symbol), str);
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}
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os << " }\n";
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os << " return \"\";\n";
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os << "}\n\n";
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}
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static void emitSymToStrFnForBitEnum(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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StringRef symToStrFnName = enumAttr.getSymbolToStringFnName();
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StringRef symToStrFnRetType = enumAttr.getSymbolToStringFnRetType();
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StringRef separator = enumDef.getValueAsString("separator");
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auto enumerants = enumAttr.getAllCases();
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auto allBitsUnsetCase = getAllBitsUnsetCase(enumerants);
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os << formatv("{2} {1}({0} symbol) {{\n", enumName, symToStrFnName,
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symToStrFnRetType);
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os << formatv(" auto val = static_cast<{0}>(symbol);\n",
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enumAttr.getUnderlyingType());
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if (allBitsUnsetCase) {
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os << " // Special case for all bits unset.\n";
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os << formatv(" if (val == 0) return \"{0}\";\n\n",
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allBitsUnsetCase->getSymbol());
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}
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os << " ::llvm::SmallVector<::llvm::StringRef, 2> strs;\n";
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for (const auto &enumerant : enumerants) {
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// Skip the special enumerant for None.
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if (auto val = enumerant.getValue())
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os << formatv(" if ({0}u & val) {{ strs.push_back(\"{1}\"); "
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"val &= ~{0}u; }\n",
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val, enumerant.getStr());
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}
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// If we have unknown bit set, return an empty string to signal errors.
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os << "\n if (val) return \"\";\n";
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os << formatv(" return ::llvm::join(strs, \"{0}\");\n", separator);
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os << "}\n\n";
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}
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static void emitStrToSymFnForIntEnum(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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StringRef strToSymFnName = enumAttr.getStringToSymbolFnName();
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auto enumerants = enumAttr.getAllCases();
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os << formatv("::llvm::Optional<{0}> {1}(::llvm::StringRef str) {{\n",
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enumName, strToSymFnName);
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os << formatv(" return ::llvm::StringSwitch<::llvm::Optional<{0}>>(str)\n",
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enumName);
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for (const auto &enumerant : enumerants) {
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auto symbol = enumerant.getSymbol();
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auto str = enumerant.getStr();
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os << formatv(" .Case(\"{1}\", {0}::{2})\n", enumName, str,
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makeIdentifier(symbol));
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}
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os << " .Default(::llvm::None);\n";
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os << "}\n";
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}
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static void emitStrToSymFnForBitEnum(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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std::string underlyingType = std::string(enumAttr.getUnderlyingType());
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StringRef strToSymFnName = enumAttr.getStringToSymbolFnName();
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StringRef separator = enumDef.getValueAsString("separator");
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auto enumerants = enumAttr.getAllCases();
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auto allBitsUnsetCase = getAllBitsUnsetCase(enumerants);
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os << formatv("::llvm::Optional<{0}> {1}(::llvm::StringRef str) {{\n",
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enumName, strToSymFnName);
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if (allBitsUnsetCase) {
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os << " // Special case for all bits unset.\n";
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StringRef caseSymbol = allBitsUnsetCase->getSymbol();
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os << formatv(" if (str == \"{1}\") return {0}::{2};\n\n", enumName,
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caseSymbol, makeIdentifier(caseSymbol));
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}
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// Split the string to get symbols for all the bits.
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os << " ::llvm::SmallVector<::llvm::StringRef, 2> symbols;\n";
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os << formatv(" str.split(symbols, \"{0}\");\n\n", separator);
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os << formatv(" {0} val = 0;\n", underlyingType);
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os << " for (auto symbol : symbols) {\n";
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// Convert each symbol to the bit ordinal and set the corresponding bit.
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os << formatv(
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" auto bit = llvm::StringSwitch<::llvm::Optional<{0}>>(symbol)\n",
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underlyingType);
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for (const auto &enumerant : enumerants) {
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// Skip the special enumerant for None.
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if (auto val = enumerant.getValue())
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os.indent(6) << formatv(".Case(\"{0}\", {1})\n", enumerant.getStr(), val);
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}
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os.indent(6) << ".Default(::llvm::None);\n";
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os << " if (bit) { val |= *bit; } else { return ::llvm::None; }\n";
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os << " }\n";
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os << formatv(" return static_cast<{0}>(val);\n", enumName);
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os << "}\n\n";
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}
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static void emitUnderlyingToSymFnForIntEnum(const Record &enumDef,
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raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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std::string underlyingType = std::string(enumAttr.getUnderlyingType());
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StringRef underlyingToSymFnName = enumAttr.getUnderlyingToSymbolFnName();
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auto enumerants = enumAttr.getAllCases();
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// Avoid generating the underlying value to symbol conversion function if
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// there is an enumerant without explicit value.
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if (llvm::any_of(enumerants, [](EnumAttrCase enumerant) {
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return enumerant.getValue() < 0;
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}))
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return;
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os << formatv("::llvm::Optional<{0}> {1}({2} value) {{\n", enumName,
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underlyingToSymFnName,
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underlyingType.empty() ? std::string("unsigned")
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: underlyingType)
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<< " switch (value) {\n";
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for (const auto &enumerant : enumerants) {
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auto symbol = enumerant.getSymbol();
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auto value = enumerant.getValue();
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os << formatv(" case {0}: return {1}::{2};\n", value, enumName,
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makeIdentifier(symbol));
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}
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os << " default: return ::llvm::None;\n"
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<< " }\n"
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<< "}\n\n";
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}
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static void emitSpecializedAttrDef(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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StringRef symToStrFnName = enumAttr.getSymbolToStringFnName();
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StringRef strToSymFnName = enumAttr.getStringToSymbolFnName();
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StringRef attrClassName = enumAttr.getSpecializedAttrClassName();
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llvm::Record *baseAttrDef = enumAttr.getBaseAttrClass();
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Attribute baseAttr(baseAttrDef);
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// Emit classof method
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os << formatv("bool {0}::classof(::mlir::Attribute attr) {{\n",
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attrClassName);
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mlir::tblgen::Pred baseAttrPred = baseAttr.getPredicate();
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if (baseAttrPred.isNull())
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PrintFatalError("ERROR: baseAttrClass for EnumAttr has no Predicate\n");
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std::string condition = baseAttrPred.getCondition();
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FmtContext verifyCtx;
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verifyCtx.withSelf("attr");
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os << tgfmt(" return $0;\n", /*ctx=*/nullptr, tgfmt(condition, &verifyCtx));
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os << "}\n";
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// Emit get method
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os << formatv("{0} {0}::get(::mlir::MLIRContext *context, {1} val) {{\n",
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attrClassName, enumName);
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if (enumAttr.isSubClassOf("StrEnumAttr")) {
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os << formatv(" ::mlir::StringAttr baseAttr = "
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"::mlir::StringAttr::get(context, {0}(val));\n",
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symToStrFnName);
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} else {
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StringRef underlyingType = enumAttr.getUnderlyingType();
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// Assuming that it is IntegerAttr constraint
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int64_t bitwidth = 64;
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if (baseAttrDef->getValue("valueType")) {
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auto *valueTypeDef = baseAttrDef->getValueAsDef("valueType");
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if (valueTypeDef->getValue("bitwidth"))
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bitwidth = valueTypeDef->getValueAsInt("bitwidth");
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}
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os << formatv(" ::mlir::IntegerType intType = "
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"::mlir::IntegerType::get(context, {0});\n",
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bitwidth);
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os << formatv(" ::mlir::IntegerAttr baseAttr = "
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"::mlir::IntegerAttr::get(intType, static_cast<{0}>(val));\n",
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underlyingType);
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}
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os << formatv(" return baseAttr.cast<{0}>();\n", attrClassName);
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os << "}\n";
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// Emit getValue method
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os << formatv("{0} {1}::getValue() const {{\n", enumName, attrClassName);
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if (enumAttr.isSubClassOf("StrEnumAttr")) {
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os << formatv(" const auto res = {0}(::mlir::StringAttr::getValue());\n",
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strToSymFnName);
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os << " return res.getValue();\n";
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} else {
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os << formatv(" return static_cast<{0}>(::mlir::IntegerAttr::getInt());\n",
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enumName);
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}
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os << "}\n";
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}
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static void emitUnderlyingToSymFnForBitEnum(const Record &enumDef,
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raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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std::string underlyingType = std::string(enumAttr.getUnderlyingType());
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StringRef underlyingToSymFnName = enumAttr.getUnderlyingToSymbolFnName();
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auto enumerants = enumAttr.getAllCases();
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auto allBitsUnsetCase = getAllBitsUnsetCase(enumerants);
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os << formatv("::llvm::Optional<{0}> {1}({2} value) {{\n", enumName,
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underlyingToSymFnName, underlyingType);
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if (allBitsUnsetCase) {
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os << " // Special case for all bits unset.\n";
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os << formatv(" if (value == 0) return {0}::{1};\n\n", enumName,
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makeIdentifier(allBitsUnsetCase->getSymbol()));
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}
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llvm::SmallVector<std::string, 8> values;
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for (const auto &enumerant : enumerants) {
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if (auto val = enumerant.getValue())
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values.push_back(std::string(formatv("{0}u", val)));
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}
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os << formatv(" if (value & ~({0})) return llvm::None;\n",
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llvm::join(values, " | "));
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os << formatv(" return static_cast<{0}>(value);\n", enumName);
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os << "}\n";
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}
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static void emitEnumDecl(const Record &enumDef, raw_ostream &os) {
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EnumAttr enumAttr(enumDef);
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StringRef enumName = enumAttr.getEnumClassName();
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StringRef cppNamespace = enumAttr.getCppNamespace();
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std::string underlyingType = std::string(enumAttr.getUnderlyingType());
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StringRef description = enumAttr.getSummary();
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StringRef strToSymFnName = enumAttr.getStringToSymbolFnName();
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StringRef symToStrFnName = enumAttr.getSymbolToStringFnName();
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StringRef symToStrFnRetType = enumAttr.getSymbolToStringFnRetType();
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StringRef underlyingToSymFnName = enumAttr.getUnderlyingToSymbolFnName();
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auto enumerants = enumAttr.getAllCases();
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llvm::SmallVector<StringRef, 2> namespaces;
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llvm::SplitString(cppNamespace, namespaces, "::");
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for (auto ns : namespaces)
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os << "namespace " << ns << " {\n";
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// Emit the enum class definition
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emitEnumClass(enumDef, enumName, underlyingType, description, enumerants, os);
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// Emit conversion function declarations
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if (llvm::all_of(enumerants, [](EnumAttrCase enumerant) {
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return enumerant.getValue() >= 0;
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})) {
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os << formatv(
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"::llvm::Optional<{0}> {1}({2});\n", enumName, underlyingToSymFnName,
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underlyingType.empty() ? std::string("unsigned") : underlyingType);
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}
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os << formatv("{2} {1}({0});\n", enumName, symToStrFnName, symToStrFnRetType);
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os << formatv("::llvm::Optional<{0}> {1}(::llvm::StringRef);\n", enumName,
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strToSymFnName);
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if (enumAttr.isBitEnum()) {
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emitOperators(enumDef, os);
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} else {
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emitMaxValueFn(enumDef, os);
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}
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// Generate a generic `stringifyEnum` function that forwards to the method
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// specified by the user.
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const char *const stringifyEnumStr = R"(
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inline {0} stringifyEnum({1} enumValue) {{
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return {2}(enumValue);
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}
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)";
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os << formatv(stringifyEnumStr, symToStrFnRetType, enumName, symToStrFnName);
|
|
|
|
// Generate a generic `symbolizeEnum` function that forwards to the method
|
|
// specified by the user.
|
|
const char *const symbolizeEnumStr = R"(
|
|
template <typename EnumType>
|
|
::llvm::Optional<EnumType> symbolizeEnum(::llvm::StringRef);
|
|
|
|
template <>
|
|
inline ::llvm::Optional<{0}> symbolizeEnum<{0}>(::llvm::StringRef str) {
|
|
return {1}(str);
|
|
}
|
|
)";
|
|
os << formatv(symbolizeEnumStr, enumName, strToSymFnName);
|
|
|
|
const char *const attrClassDecl = R"(
|
|
class {1} : public ::mlir::{2} {
|
|
public:
|
|
using ValueType = {0};
|
|
using ::mlir::{2}::{2};
|
|
static bool classof(::mlir::Attribute attr);
|
|
static {1} get(::mlir::MLIRContext *context, {0} val);
|
|
{0} getValue() const;
|
|
};
|
|
)";
|
|
if (enumAttr.genSpecializedAttr()) {
|
|
StringRef attrClassName = enumAttr.getSpecializedAttrClassName();
|
|
StringRef baseAttrClassName =
|
|
enumAttr.isSubClassOf("StrEnumAttr") ? "StringAttr" : "IntegerAttr";
|
|
os << formatv(attrClassDecl, enumName, attrClassName, baseAttrClassName);
|
|
}
|
|
|
|
for (auto ns : llvm::reverse(namespaces))
|
|
os << "} // namespace " << ns << "\n";
|
|
|
|
// Emit DenseMapInfo for this enum class
|
|
emitDenseMapInfo(enumName, underlyingType, cppNamespace, os);
|
|
}
|
|
|
|
static bool emitEnumDecls(const RecordKeeper &recordKeeper, raw_ostream &os) {
|
|
llvm::emitSourceFileHeader("Enum Utility Declarations", os);
|
|
|
|
auto defs = recordKeeper.getAllDerivedDefinitions("EnumAttrInfo");
|
|
for (const auto *def : defs)
|
|
emitEnumDecl(*def, os);
|
|
|
|
return false;
|
|
}
|
|
|
|
static void emitEnumDef(const Record &enumDef, raw_ostream &os) {
|
|
EnumAttr enumAttr(enumDef);
|
|
StringRef cppNamespace = enumAttr.getCppNamespace();
|
|
|
|
llvm::SmallVector<StringRef, 2> namespaces;
|
|
llvm::SplitString(cppNamespace, namespaces, "::");
|
|
|
|
for (auto ns : namespaces)
|
|
os << "namespace " << ns << " {\n";
|
|
|
|
if (enumAttr.isBitEnum()) {
|
|
emitSymToStrFnForBitEnum(enumDef, os);
|
|
emitStrToSymFnForBitEnum(enumDef, os);
|
|
emitUnderlyingToSymFnForBitEnum(enumDef, os);
|
|
} else {
|
|
emitSymToStrFnForIntEnum(enumDef, os);
|
|
emitStrToSymFnForIntEnum(enumDef, os);
|
|
emitUnderlyingToSymFnForIntEnum(enumDef, os);
|
|
}
|
|
|
|
if (enumAttr.genSpecializedAttr())
|
|
emitSpecializedAttrDef(enumDef, os);
|
|
|
|
for (auto ns : llvm::reverse(namespaces))
|
|
os << "} // namespace " << ns << "\n";
|
|
os << "\n";
|
|
}
|
|
|
|
static bool emitEnumDefs(const RecordKeeper &recordKeeper, raw_ostream &os) {
|
|
llvm::emitSourceFileHeader("Enum Utility Definitions", os);
|
|
|
|
auto defs = recordKeeper.getAllDerivedDefinitions("EnumAttrInfo");
|
|
for (const auto *def : defs)
|
|
emitEnumDef(*def, os);
|
|
|
|
return false;
|
|
}
|
|
|
|
// Registers the enum utility generator to mlir-tblgen.
|
|
static mlir::GenRegistration
|
|
genEnumDecls("gen-enum-decls", "Generate enum utility declarations",
|
|
[](const RecordKeeper &records, raw_ostream &os) {
|
|
return emitEnumDecls(records, os);
|
|
});
|
|
|
|
// Registers the enum utility generator to mlir-tblgen.
|
|
static mlir::GenRegistration
|
|
genEnumDefs("gen-enum-defs", "Generate enum utility definitions",
|
|
[](const RecordKeeper &records, raw_ostream &os) {
|
|
return emitEnumDefs(records, os);
|
|
});
|