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