GCC Code Coverage Report

Directory: ../
Coverage: low: ≥ 0% medium: ≥ 75.0% high: ≥ 90.0%
Coverage Exec / Excl / Total
Lines: 94.0% 172 / 3 / 186
Functions: 100.0% 15 / 0 / 15
Branches: 60.6% 183 / 8 / 310
src/irgenerator/NameMangling.cpp
Line Branch Exec Source
1 // Copyright (c) 2021-2026 ChilliBits. All rights reserved.
2
3 #include "NameMangling.h"
4
5 #include <exception/CompilerError.h>
6 #include <global/TypeNameDisambiguator.h>
7 #include <model/Function.h>
8 #include <model/GenericType.h>
9 #include <model/Interface.h>
10 #include <model/Struct.h>
11 #include <symboltablebuilder/SymbolTableEntry.h>
12 #include <symboltablebuilder/Type.h>
13 #include <util/CommonUtil.h>
14
15 namespace spice::compiler {
16
17 #ifndef NDEBUG
18 /**
19 * Recursively check whether a type contains a function or procedure type anywhere - directly or nested as a
20 * struct template argument (e.g. Lambda<p()>). Spice mangles function/procedure types in a way that is not valid
21 * Itanium ABI, so such signatures must be excluded from the demangle-based sanity check in mangleFunction.
22 */
23 763297 static bool containsFctOrProcType(const QualType &type) {
24
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 763297 const QualType base = type.getBase();
25
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 763297 if (base.isOneOf({TY_FUNCTION, TY_PROCEDURE}))
26 2865 return true;
27
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 760432 if (base.is(TY_STRUCT)) {
28 52713 const auto pred = [](const QualType &templateType) { return containsFctOrProcType(templateType); };
29
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 214489 return std::ranges::any_of(base.getTemplateTypes(), pred);
30 }
31 545943 return false;
32 }
33 #endif
34
35 /**
36 * Mangle a function or procedure.
37 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
38 *
39 * @param spiceFunc Input function
40 * @return Mangled name
41 */
42 309385 std::string NameMangling::mangleFunction(const Function &spiceFunc) {
43 // Check if we have a predefined mangled name, specified by e.g. a function attribute
44
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 309385 if (!spiceFunc.predefinedMangledName.empty())
45 ✗ return spiceFunc.predefinedMangledName;
46
47 // Check if mangling is required
48
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 309385 if (!spiceFunc.mangleFunctionName)
49 ✗ return spiceFunc.name;
50
51
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 309385 std::stringstream mangledName;
52
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 309385 mangledName << "_Z";
53
54 // This type
55
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 309385 if (spiceFunc.isMethod()) {
56
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 217123 mangledName << "N";
57
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 217123 mangleType(mangledName, spiceFunc.thisType);
58 }
59
60 // Function name
61
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 309385 const std::string name = spiceFunc.name + spiceFunc.mangleSuffix;
62
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 309385 mangledName << name.length() << name;
63
64 // Template types
65
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 309385 bool isSelfGeneric = !spiceFunc.templateTypes.empty();
66
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 309385 if (spiceFunc.isMethod())
67
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 217123 isSelfGeneric = spiceFunc.templateTypes.size() > spiceFunc.thisType.getTemplateTypes().size();
68
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 309385 if (isSelfGeneric) {
69
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 24088 mangledName << "I";
70 // Template types themselves
71
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 81432 for (const GenericType &genericTemplateType : spiceFunc.templateTypes) {
72
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 33256 assert(spiceFunc.typeMapping.contains(genericTemplateType.getSubType()));
73
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 33256 const QualType &actualType = spiceFunc.typeMapping.at(genericTemplateType.getSubType());
74
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 33256 mangleType(mangledName, actualType);
75 }
76
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 24088 mangledName << "E";
77
78 // Insert second end marker to end the nested type
79
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 24088 if (spiceFunc.isMethod())
80
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 6577 mangledName << "E";
81
82 // Return type
83
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 24088 if (spiceFunc.isFunction())
84
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 12812 mangleType(mangledName, spiceFunc.returnType);
85 else
86
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 11276 mangledName << "v";
87
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 285297 } else if (spiceFunc.isMethod()) {
88
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 210546 mangledName << "E";
89 }
90
91 // Parameter types
92
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 898710 for (const auto &[qualType, isOptional] : spiceFunc.paramList) {
93
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 279940 assert(!isOptional);
94
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 279940 mangleType(mangledName, qualType);
95 }
96
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 309385 if (spiceFunc.paramList.empty())
97
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 121581 mangledName << "v";
98
99 #ifndef NDEBUG
100 309385 const TypeMapping &typeMapping = spiceFunc.typeMapping;
101
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 309385 const bool returnTypeIsFctOrProc = containsFctOrProcType(spiceFunc.returnType);
102 279658 const auto paramPredicate = [](const Param &p) { return containsFctOrProcType(p.qualType); };
103
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 309385 const bool paramTypeIsFctOrProc = std::ranges::any_of(spiceFunc.paramList, paramPredicate);
104 430926 const auto templateTypePredicate = [&](const GenericType &t) {
105
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 121541 if (t.is(TY_GENERIC)) {
106
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 117431 assert(typeMapping.contains(t.getSubType()));
107 117431 return containsFctOrProcType(typeMapping.at(t.getSubType()));
108 }
109 4110 return containsFctOrProcType(t);
110 309385 };
111
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 309385 const bool templateTypeIsFctOrProc = std::ranges::any_of(spiceFunc.templateTypes, templateTypePredicate);
112
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 309385 if (!returnTypeIsFctOrProc && !paramTypeIsFctOrProc && !templateTypeIsFctOrProc)
113
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 307208 assert(CommonUtil::isValidMangledName(mangledName.str()));
114 #endif
115
116
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 309385 return mangledName.str();
117 309385 }
118
119 /**
120 * Mangle a struct
121 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
122 *
123 * @param spiceStruct Input struct
124 * @return Mangled name
125 */
126 39260 std::string NameMangling::mangleStruct(const Struct &spiceStruct) { return "struct." + spiceStruct.name; }
127
128 /**
129 * Mangle an interface
130 *
131 * @param spiceInterface Input interface
132 * @return Mangled name
133 */
134 3538 std::string NameMangling::mangleInterface(const Interface &spiceInterface) { return "interface." + spiceInterface.name; }
135
136 /**
137 * Mangle a fully qualified name like e.g. test::s1::calledMethod to 4test2s112calledMethod
138 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
139 *
140 * @param out Output string stream
141 * @param name Input name
142 * @param nestedType True if the name is a nested type
143 * @return Mangled name
144 */
145 431511 void NameMangling::mangleName(std::stringstream &out, const std::string &name, bool &nestedType) {
146 431511 std::vector<std::string> fragments;
147
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 431511 std::istringstream ss(name);
148 431511 std::string token;
149
150
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 863022 while (std::getline(ss, token, ':')) {
151
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 431511 std::istringstream subStream(token);
152 431511 std::string subToken;
153
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 863022 while (std::getline(subStream, subToken, '/')) {
154
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 431511 fragments.push_back(subToken);
155 }
156 431511 }
157
158 // Start a nested type if needed. The caller needs to emit the end marker.
159
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 431511 if (fragments.size() > 1) {
160 ✗ out << "N";
161 ✗ nestedType = true;
162 }
163
164 // Process each fragment and append it to the result
165
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 1294533 for (const std::string &fragment : fragments) {
166 431511 int fragmentLength = static_cast<int>(fragment.length());
167
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 431511 out << std::to_string(fragmentLength) << fragment;
168 }
169 431511 }
170
171 /**
172 * Mangle a symbol qualType
173 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
174 *
175 * @param out Output string stream
176 * @param qualType Input symbol qualType
177 * @return Mangled name
178 */
179 716243 void NameMangling::mangleType(std::stringstream &out, const QualType &qualType) { // NOLINT(*-no-recursion)
180 716243 const Type *type = qualType.getType();
181
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 716243 assert(!qualType.hasAnyGenericParts());
182
183 // Unwrap qualType chain
184
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 716243 assert(!type->typeChain.empty());
185
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 873124 for (size_t i = type->typeChain.size() - 1; i >= 1; i--)
186 156881 mangleTypeChainElement(out, type->typeChain.at(i), false);
187
188 // Qualifiers
189
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 716243 assert(qualType.getQualifiers().isSigned == !qualType.getQualifiers().isUnsigned);
190 716243 const bool signedness = qualType.getQualifiers().isSigned;
191 // The 'heap' qualifier has no equivalent in the C++ Itanium ABI, but it changes the semantics of the type (ownership), so
192 // it must be reflected in the mangled name. Otherwise e.g. 'byte*' and 'heap byte*' manifestations of the same generic
193 // function would collide on the same mangled name. Piggyback on the 'volatile' cv-qualifier slot ('V', ordered before
194 // 'K' per the Itanium <CV-qualifiers> grammar) so demangling still succeeds.
195
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 716243 if (qualType.getQualifiers().isHeap)
196 21436 out << "V";
197
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 716243 if (qualType.getQualifiers().isConst && type->typeChain.size() > 1)
198 63595 out << "K";
199
200 // Base chain element
201 716243 mangleTypeChainElement(out, type->typeChain.front(), signedness);
202 716243 }
203
204 /**
205 * Mangle a type chain element
206 *
207 * @param out Output string stream
208 * @param chainElement Input type chain element
209 * @param signedness Signedness of the type
210 * @return Mangled name
211 */
212 873124 void NameMangling::mangleTypeChainElement(std::stringstream &out, const TypeChainElement &chainElement, bool signedness) {
213
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 873124 switch (chainElement.superType) {
214 67776 case TY_PTR:
215
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 67776 out << "P";
216 67776 break;
217 1036 case TY_ARRAY:
218
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 1036 if (chainElement.data.arraySize == ARRAY_SIZE_UNKNOWN)
219
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 858 out << "P";
220 else
221
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 178 out << "A" << chainElement.data.arraySize << "_";
222 1036 break;
223 88069 case TY_REF:
224
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 88069 out << "R";
225 88069 break;
226 8245 case TY_DOUBLE:
227
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 8245 assert(signedness && "Unsigned double types are forbidden");
228
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 8245 out << "d";
229 8245 break;
230 68235 case TY_INT:
231
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 68235 out << (signedness ? "i" : "j");
232 68235 break;
233 7624 case TY_SHORT:
234
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 7624 out << (signedness ? "s" : "t");
235 7624 break;
236 53577 case TY_LONG:
237
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 53577 out << (signedness ? "l" : "m");
238 53577 break;
239 28749 case TY_BYTE:
240
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 28749 out << (signedness ? "a" : "h");
241 28749 break;
242 32930 case TY_CHAR:
243
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 32930 out << "c";
244 32930 break;
245 66127 case TY_STRING:
246
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 66127 out << "PKc";
247 66127 break;
248 16346 case TY_BOOL:
249
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 16346 assert(!signedness && "Signed bool types are forbidden");
250
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 16346 out << "b";
251 16346 break;
252 431511 case TY_STRUCT: // fall-through
253 case TY_INTERFACE: {
254 431511 bool nestedType = false;
255 // Append a disambiguation suffix for same-named but distinct structs/interfaces (see issue #1253), so that two
256 // independent types sharing a name do not end up with the same mangled name (and thus clash at link time).
257 431511 const std::string name =
258
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 431511 chainElement.subType + TypeNameDisambiguator::getDisambiguationSuffix(chainElement.subType, chainElement.typeId);
259
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 431511 mangleName(out, name, nestedType);
260
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 431511 if (!chainElement.templateTypes.empty()) {
261
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 127431 out << "I";
262
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 405357 for (const QualType &templateType : chainElement.templateTypes)
263
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 150495 mangleType(out, templateType);
264
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 127431 out << "E";
265 }
266
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 431511 if (nestedType)
267 ✗ out << "E";
268 431511 break;
269 431511 }
270 ✗ case TY_ENUM: {
271 ✗ bool nestedType = false;
272 ✗ mangleName(out, chainElement.subType, nestedType);
273 ✗ if (nestedType)
274 ✗ out << "E";
275 ✗ break;
276 }
277 314 case TY_FUNCTION: {
278
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 314 out << (chainElement.data.hasCaptures ? "PFC" : "PF");
279
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 1343 for (const QualType &paramType : chainElement.paramTypes)
280
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 715 mangleType(out, paramType);
281
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 314 out << "E";
282 314 break;
283 }
284 2585 case TY_PROCEDURE: {
285
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 2585 out << (chainElement.data.hasCaptures ? "PFCv" : "PFv");
286
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 4355 for (size_t i = 1; i < chainElement.paramTypes.size(); i++)
287
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 1770 mangleType(out, chainElement.paramTypes.at(i));
288
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 2585 out << "E";
289 2585 break;
290 }
291 − default: // GCOV_EXCL_LINE
292 − const std::string message = "Type " + chainElement.getName(false, true, true) + " cannot be mangled"; // GCOV_EXCL_LINE
293 − throw CompilerError(INTERNAL_ERROR, message); // GCOV_EXCL_LINE
294 }
295 873124 }
296
297 4522 std::string NameMangling::mangleTypeInfoName(const StructBase *structBase) {
298
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 4522 std::stringstream out;
299
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 4522 out << "_ZTS";
300
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 4522 mangleType(out, structBase->entry->getQualType());
301
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 9044 return out.str();
302 4522 }
303
304
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 9044 std::string NameMangling::mangleTypeInfoValue(const std::string &value) { return std::to_string(value.size()) + value; }
305
306 6566 std::string NameMangling::mangleTypeInfo(const StructBase *structBase) {
307
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 6566 std::stringstream out;
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 6566 out << "_ZTI";
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 6566 mangleType(out, structBase->entry->getQualType());
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 13132 return out.str();
311 6566 }
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313 9044 std::string NameMangling::mangleVTable(const StructBase *structBase) {
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 9044 std::stringstream out;
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 9044 out << "_ZTV";
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 9044 mangleType(out, structBase->entry->getQualType());
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 18088 return out.str();
318 9044 }
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320 4304 std::string NameMangling::mangleVTable(const std::string &typeName) {
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 8608 return "_ZTV" + std::to_string(typeName.size()) + typeName;
322 }
323
324 } // namespace spice::compiler
325