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| 1 | +// slang-ast-natural-layout.cpp |
| 2 | +#include "slang-ast-natural-layout.h" |
| 3 | + |
| 4 | +#include "slang-ast-builder.h" |
| 5 | + |
| 6 | +// For BaseInfo |
| 7 | +#include "slang-compiler.h" |
| 8 | + |
| 9 | +namespace Slang |
| 10 | +{ |
| 11 | + |
| 12 | +/* !!!!!!!!!!!!!!!!!!!!!!!!! NaturalSize !!!!!!!!!!!!!!!!!!!!!!!!!!!! */ |
| 13 | + |
| 14 | + |
| 15 | +NaturalSize NaturalSize::operator*(Count count) const |
| 16 | +{ |
| 17 | + // If the count is < 0 or the size is invalid, the result is invalid |
| 18 | + if (isInvalid() || count < 0) |
| 19 | + { |
| 20 | + return makeInvalid(); |
| 21 | + } |
| 22 | + |
| 23 | + if (count <= 0) |
| 24 | + { |
| 25 | + // If the count is 0, in effect the result doesn't take up any space |
| 26 | + return makeEmpty(); |
| 27 | + } |
| 28 | + else |
| 29 | + { |
| 30 | + // We don't want to produce an aligned size, as we allow the last element to not |
| 31 | + // take up a whole stride (only up to size) |
| 32 | + return make(size + (getStride() * (count - 1)), alignment); |
| 33 | + } |
| 34 | +} |
| 35 | + |
| 36 | +/* static */NaturalSize NaturalSize::makeFromBaseType(BaseType baseType) |
| 37 | +{ |
| 38 | + // Special case void |
| 39 | + if (baseType == BaseType::Void) |
| 40 | + { |
| 41 | + return makeEmpty(); |
| 42 | + } |
| 43 | + else |
| 44 | + { |
| 45 | + // In "natural" layout the alignment of a base type is always the same |
| 46 | + // as the size of the type itself |
| 47 | + auto info = BaseTypeInfo::getInfo(baseType); |
| 48 | + return make(info.sizeInBytes, info.sizeInBytes); |
| 49 | + } |
| 50 | +} |
| 51 | + |
| 52 | +/* static */NaturalSize NaturalSize::calcUnion(NaturalSize a, NaturalSize b) |
| 53 | +{ |
| 54 | + const auto alignment = maxAlignment(a.alignment, b.alignment); |
| 55 | + Count size = (alignment == kInvalidAlignment) ? 0 : Math::Max(a.size, b.size); |
| 56 | + return make(size, alignment); |
| 57 | +} |
| 58 | + |
| 59 | +/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ASTNaturalLayoutContext !!!!!!!!!!!!!!!!!!!!!!!!!!!! */ |
| 60 | + |
| 61 | +ASTNaturalLayoutContext::ASTNaturalLayoutContext(ASTBuilder* astBuilder, DiagnosticSink* sink): |
| 62 | + m_astBuilder(astBuilder), |
| 63 | + m_sink(sink) |
| 64 | +{ |
| 65 | + // A null type always maps to invalid |
| 66 | + m_typeToSize.add(nullptr, NaturalSize::makeInvalid()); |
| 67 | +} |
| 68 | + |
| 69 | +Count ASTNaturalLayoutContext::_getCount(IntVal* intVal) |
| 70 | +{ |
| 71 | + if (auto constIntVal = as<ConstantIntVal>(intVal)) |
| 72 | + { |
| 73 | + if (constIntVal->value >= 0) |
| 74 | + { |
| 75 | + return Count(constIntVal->value); |
| 76 | + } |
| 77 | + } |
| 78 | + |
| 79 | + if (m_sink) |
| 80 | + { |
| 81 | + // Could output an error |
| 82 | + } |
| 83 | + |
| 84 | + return -1; |
| 85 | +} |
| 86 | + |
| 87 | +NaturalSize ASTNaturalLayoutContext::calcSize(Type* type) |
| 88 | +{ |
| 89 | + if (auto sizePtr = m_typeToSize.tryGetValue(type)) |
| 90 | + { |
| 91 | + return *sizePtr; |
| 92 | + } |
| 93 | + |
| 94 | + // Calc the size |
| 95 | + const NaturalSize size = _calcSizeImpl(type); |
| 96 | + |
| 97 | + // We want to add to the cache, but we need to special case |
| 98 | + // in case there is an aggregate type that `poisoned` the cache entry, to stop infinite recursion. |
| 99 | + // |
| 100 | + // A requirement is that when the agg type completes it must set the cache entry, and return the same result. |
| 101 | + if (auto foundSize = m_typeToSize.tryGetValueOrAdd(type, size)) |
| 102 | + { |
| 103 | + // If there is a found size, it must match. If not we update the state as invalid. |
| 104 | + if (*foundSize != size) |
| 105 | + { |
| 106 | + *foundSize = NaturalSize::makeInvalid(); |
| 107 | + return *foundSize; |
| 108 | + } |
| 109 | + } |
| 110 | + |
| 111 | + return size; |
| 112 | +} |
| 113 | + |
| 114 | +NaturalSize ASTNaturalLayoutContext::_calcSizeImpl(Type* type) |
| 115 | +{ |
| 116 | + if (VectorExpressionType* vecType = as<VectorExpressionType>(type)) |
| 117 | + { |
| 118 | + const Count elementCount = _getCount(vecType->elementCount); |
| 119 | + return (elementCount > 0) ? |
| 120 | + calcSize(vecType->elementType) * elementCount : |
| 121 | + NaturalSize::makeInvalid(); |
| 122 | + } |
| 123 | + else if (auto matType = as<MatrixExpressionType>(type)) |
| 124 | + { |
| 125 | + const Count colCount = _getCount(matType->getColumnCount()); |
| 126 | + const Count rowCount = _getCount(matType->getRowCount()); |
| 127 | + return (colCount > 0 && rowCount > 0) ? |
| 128 | + calcSize(matType->getElementType()) * (colCount * rowCount) : |
| 129 | + NaturalSize::makeInvalid(); |
| 130 | + } |
| 131 | + else if (auto basicType = as<BasicExpressionType>(type)) |
| 132 | + { |
| 133 | + return NaturalSize::makeFromBaseType(basicType->baseType); |
| 134 | + } |
| 135 | + else if (as<PtrTypeBase>(type) || as<NullPtrType>(type)) |
| 136 | + { |
| 137 | + // We assume 64 bits/8 bytes across the board |
| 138 | + return NaturalSize::makeFromBaseType(BaseType::UInt64); |
| 139 | + } |
| 140 | + else if ( auto arrayType = as<ArrayExpressionType>(type)) |
| 141 | + { |
| 142 | + const Count elementCount = _getCount(arrayType->getElementCount()); |
| 143 | + return (elementCount > 0) ? |
| 144 | + calcSize(arrayType->getElementType()) * elementCount : |
| 145 | + NaturalSize::makeInvalid(); |
| 146 | + } |
| 147 | + else if (auto namedType = as<NamedExpressionType>(type)) |
| 148 | + { |
| 149 | + return calcSize(namedType->innerType); |
| 150 | + } |
| 151 | + else if (const auto tupleType = as<TupleType>(type)) |
| 152 | + { |
| 153 | + // Initialize empty |
| 154 | + NaturalSize size = NaturalSize::makeEmpty(); |
| 155 | + |
| 156 | + // Accumulate over all the member types |
| 157 | + for (auto cur : tupleType->memberTypes) |
| 158 | + { |
| 159 | + const auto curSize = calcSize(cur); |
| 160 | + if (!curSize) |
| 161 | + { |
| 162 | + return NaturalSize::makeInvalid(); |
| 163 | + } |
| 164 | + size.append(curSize); |
| 165 | + } |
| 166 | + |
| 167 | + return size; |
| 168 | + } |
| 169 | + else if (const auto taggedUnion = as<TaggedUnionType>(type)) |
| 170 | + { |
| 171 | + NaturalSize size = NaturalSize::makeInvalid(); |
| 172 | + |
| 173 | + for( auto caseType : taggedUnion->caseTypes ) |
| 174 | + { |
| 175 | + const NaturalSize caseSize = calcSize(caseType); |
| 176 | + if (!caseSize) |
| 177 | + { |
| 178 | + return NaturalSize::makeInvalid(); |
| 179 | + } |
| 180 | + size = NaturalSize::calcUnion(size, caseSize); |
| 181 | + } |
| 182 | + |
| 183 | + // After we've computed the size required to hold all the |
| 184 | + // case types, we will allocate space for the tag field. |
| 185 | + |
| 186 | + // Currently we assume uint32_t on all targets |
| 187 | + size.append(NaturalSize::makeFromBaseType(BaseType::UInt)); |
| 188 | + |
| 189 | + return size; |
| 190 | + } |
| 191 | + else if( auto declRefType = as<DeclRefType>(type) ) |
| 192 | + { |
| 193 | + if (const auto enumDeclRef = declRefType->declRef.as<EnumDecl>()) |
| 194 | + { |
| 195 | + Type* tagType = getTagType(m_astBuilder, enumDeclRef); |
| 196 | + return calcSize(tagType); |
| 197 | + } |
| 198 | + else if(const auto structDeclRef = declRefType->declRef.as<StructDecl>()) |
| 199 | + { |
| 200 | + // Poison the cache whilst we construct |
| 201 | + m_typeToSize.add(type, NaturalSize::makeInvalid()); |
| 202 | + |
| 203 | + // Initialize empty |
| 204 | + NaturalSize size = NaturalSize::makeEmpty(); |
| 205 | + |
| 206 | + for (auto inherited : structDeclRef.getDecl()->getMembersOfType<InheritanceDecl>()) |
| 207 | + { |
| 208 | + // Look for a struct type that it inherits from |
| 209 | + if (auto inheritedDeclRef = as<DeclRefType>(inherited->base.type)) |
| 210 | + { |
| 211 | + if (auto parentDecl = inheritedDeclRef->declRef.as<StructDecl>()) |
| 212 | + { |
| 213 | + // We can only inherit from one thing |
| 214 | + size = calcSize(inherited->base.type); |
| 215 | + if (!size) |
| 216 | + { |
| 217 | + return size; |
| 218 | + } |
| 219 | + break; |
| 220 | + } |
| 221 | + } |
| 222 | + } |
| 223 | + |
| 224 | + // Accumulate over all of the fields |
| 225 | + for (auto field : structDeclRef.getDecl()->getFields()) |
| 226 | + { |
| 227 | + const auto fieldSize = calcSize(field->getType()); |
| 228 | + if (!fieldSize) |
| 229 | + { |
| 230 | + return NaturalSize::makeInvalid(); |
| 231 | + } |
| 232 | + size.append(fieldSize); |
| 233 | + } |
| 234 | + |
| 235 | + // Set the cached result to the size. |
| 236 | + m_typeToSize.set(type, size); |
| 237 | + |
| 238 | + return size; |
| 239 | + } |
| 240 | + else if (const auto typeDef = declRefType->declRef.as<TypeDefDecl>()) |
| 241 | + { |
| 242 | + return calcSize(typeDef.getDecl()->type); |
| 243 | + } |
| 244 | + } |
| 245 | + |
| 246 | + return NaturalSize::makeInvalid(); |
| 247 | +} |
| 248 | + |
| 249 | +} // namespace Slang |
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