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 306104 static bool containsFctOrProcType(const QualType &type) {
24
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 306104 const QualType base = type.getBase();
25
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 306104 if (base.isOneOf({TY_FUNCTION, TY_PROCEDURE}))
26 1046 return true;
27
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 305058 if (base.is(TY_STRUCT)) {
28 41023 const auto pred = [](const QualType &templateType) { return containsFctOrProcType(templateType); };
29
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 99810 return std::ranges::any_of(base.getTemplateTypes(), pred);
30 }
31 205248 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 115429 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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 115429 if (!spiceFunc.predefinedMangledName.empty())
45 ✗ return spiceFunc.predefinedMangledName;
46
47 // Check if mangling is required
48
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 115429 if (!spiceFunc.mangleFunctionName)
49 ✗ return spiceFunc.name;
50
51
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 115429 std::stringstream mangledName;
52
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 115429 mangledName << "_Z";
53
54 // This type
55
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 115429 if (spiceFunc.isMethod()) {
56
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 85196 mangledName << "N";
57
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 85196 mangleType(mangledName, spiceFunc.thisType);
58 }
59
60 // Function name
61
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 115429 const std::string name = spiceFunc.name + spiceFunc.mangleSuffix;
62
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 115429 mangledName << name.length() << name;
63
64 // Template types
65
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 115429 bool isSelfGeneric = !spiceFunc.templateTypes.empty();
66
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 115429 if (spiceFunc.isMethod())
67
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 85196 isSelfGeneric = spiceFunc.templateTypes.size() > spiceFunc.thisType.getTemplateTypes().size();
68
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 115429 if (isSelfGeneric) {
69
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 9236 mangledName << "I";
70 // Template types themselves
71
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 31554 for (const GenericType &genericTemplateType : spiceFunc.templateTypes) {
72
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 13082 assert(spiceFunc.typeMapping.contains(genericTemplateType.getSubType()));
73
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 13082 const QualType &actualType = spiceFunc.typeMapping.at(genericTemplateType.getSubType());
74
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 13082 mangleType(mangledName, actualType);
75 }
76
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 9236 mangledName << "E";
77
78 // Insert second end marker to end the nested type
79
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 9236 if (spiceFunc.isMethod())
80
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 2519 mangledName << "E";
81
82 // Return type
83
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 9236 if (spiceFunc.isFunction())
84
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 4540 mangleType(mangledName, spiceFunc.returnType);
85 else
86
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 4696 mangledName << "v";
87
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 106193 } else if (spiceFunc.isMethod()) {
88
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 82677 mangledName << "E";
89 }
90
91 // Parameter types
92
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 331066 for (const auto &[qualType, isOptional] : spiceFunc.paramList) {
93
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 100208 assert(!isOptional);
94
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 100208 mangleType(mangledName, qualType);
95 }
96
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 115429 if (spiceFunc.paramList.empty())
97
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 46420 mangledName << "v";
98
99 #ifndef NDEBUG
100 115429 const TypeMapping &typeMapping = spiceFunc.typeMapping;
101
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 115429 const bool returnTypeIsFctOrProc = containsFctOrProcType(spiceFunc.returnType);
102 100114 const auto paramPredicate = [](const Param &p) { return containsFctOrProcType(p.qualType); };
103
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 115429 const bool paramTypeIsFctOrProc = std::ranges::any_of(spiceFunc.paramList, paramPredicate);
104 164967 const auto templateTypePredicate = [&](const GenericType &t) {
105
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 49538 if (t.is(TY_GENERIC)) {
106
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 49534 assert(typeMapping.contains(t.getSubType()));
107 49534 return containsFctOrProcType(typeMapping.at(t.getSubType()));
108 }
109 4 return containsFctOrProcType(t);
110 115429 };
111
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 115429 const bool templateTypeIsFctOrProc = std::ranges::any_of(spiceFunc.templateTypes, templateTypePredicate);
112
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 115429 if (!returnTypeIsFctOrProc && !paramTypeIsFctOrProc && !templateTypeIsFctOrProc)
113
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 114640 assert(CommonUtil::isValidMangledName(mangledName.str()));
114 #endif
115
116
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 115429 return mangledName.str();
117 115429 }
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 9819 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 1256 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 189948 void NameMangling::mangleName(std::stringstream &out, const std::string &name, bool &nestedType) {
146 189948 std::vector<std::string> fragments;
147
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 189948 std::istringstream ss(name);
148 189948 std::string token;
149
150
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 379896 while (std::getline(ss, token, ':')) {
151
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 189948 std::istringstream subStream(token);
152 189948 std::string subToken;
153
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 379896 while (std::getline(subStream, subToken, '/')) {
154
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 189948 fragments.push_back(subToken);
155 }
156 189948 }
157
158 // Start a nested type if needed. The caller needs to emit the end marker.
159
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 189948 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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 569844 for (const std::string &fragment : fragments) {
166 189948 int fragmentLength = static_cast<int>(fragment.length());
167
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 189948 out << std::to_string(fragmentLength) << fragment;
168 }
169 189948 }
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 298776 void NameMangling::mangleType(std::stringstream &out, const QualType &qualType) { // NOLINT(*-no-recursion)
180 298776 const Type *type = qualType.getType();
181
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 298776 assert(!qualType.hasAnyGenericParts());
182
183 // Unwrap qualType chain
184
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 298776 assert(!type->typeChain.empty());
185
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 358648 for (size_t i = type->typeChain.size() - 1; i >= 1; i--)
186 59872 mangleTypeChainElement(out, type->typeChain.at(i), false);
187
188 // Qualifiers
189
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 298776 assert(qualType.getQualifiers().isSigned == !qualType.getQualifiers().isUnsigned);
190 298776 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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 298776 if (qualType.getQualifiers().isHeap)
196 9234 out << "V";
197
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 298776 if (qualType.getQualifiers().isConst && type->typeChain.size() > 1)
198 23079 out << "K";
199
200 // Base chain element
201 298776 mangleTypeChainElement(out, type->typeChain.front(), signedness);
202 298776 }
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 358648 void NameMangling::mangleTypeChainElement(std::stringstream &out, const TypeChainElement &chainElement, bool signedness) {
213
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 358648 switch (chainElement.superType) {
214 27200 case TY_PTR:
215
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 27200 out << "P";
216 27200 break;
217 422 case TY_ARRAY:
218
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 422 if (chainElement.data.arraySize == ARRAY_SIZE_UNKNOWN)
219
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 349 out << "P";
220 else
221
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 73 out << "A" << chainElement.data.arraySize << "_";
222 422 break;
223 32250 case TY_REF:
224
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 32250 out << "R";
225 32250 break;
226 3240 case TY_DOUBLE:
227
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 3240 assert(signedness && "Unsigned double types are forbidden");
228
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 3240 out << "d";
229 3240 break;
230 27388 case TY_INT:
231
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 27388 out << (signedness ? "i" : "j");
232 27388 break;
233 3091 case TY_SHORT:
234
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 3091 out << (signedness ? "s" : "t");
235 3091 break;
236 21196 case TY_LONG:
237
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 21196 out << (signedness ? "l" : "m");
238 21196 break;
239 9547 case TY_BYTE:
240
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 9547 out << (signedness ? "a" : "h");
241 9547 break;
242 12193 case TY_CHAR:
243
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 12193 out << "c";
244 12193 break;
245 23864 case TY_STRING:
246
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 23864 out << "PKc";
247 23864 break;
248 7270 case TY_BOOL:
249
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 7270 assert(!signedness && "Signed bool types are forbidden");
250
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 7270 out << "b";
251 7270 break;
252 189948 case TY_STRUCT: // fall-through
253 case TY_INTERFACE: {
254 189948 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 189948 const std::string name =
258
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 189948 chainElement.subType + TypeNameDisambiguator::getDisambiguationSuffix(chainElement.subType, chainElement.typeId);
259
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 189948 mangleName(out, name, nestedType);
260
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 189948 if (!chainElement.templateTypes.empty()) {
261
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 68606 out << "I";
262
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 221820 for (const QualType &templateType : chainElement.templateTypes)
263
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 84608 mangleType(out, templateType);
264
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 68606 out << "E";
265 }
266
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 189948 if (nestedType)
267 ✗ out << "E";
268 189948 break;
269 189948 }
270 ✗ case TY_ENUM: {
271 ✗ bool nestedType = false;
272 ✗ mangleName(out, chainElement.subType, nestedType);
273 ✗ if (nestedType)
274 ✗ out << "E";
275 ✗ break;
276 }
277 93 case TY_FUNCTION: {
278
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 93 out << (chainElement.data.hasCaptures ? "PFC" : "PF");
279
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 398 for (const QualType &paramType : chainElement.paramTypes)
280
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 212 mangleType(out, paramType);
281
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 93 out << "E";
282 93 break;
283 }
284 946 case TY_PROCEDURE: {
285
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 946 out << (chainElement.data.hasCaptures ? "PFCv" : "PFv");
286
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 1583 for (size_t i = 1; i < chainElement.paramTypes.size(); i++)
287
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 637 mangleType(out, chainElement.paramTypes.at(i));
288
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 946 out << "E";
289 946 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 358648 }
296
297 2311 std::string NameMangling::mangleTypeInfoName(const StructBase *structBase) {
298
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 2311 std::stringstream out;
299
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 2311 out << "_ZTS";
300
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 2311 mangleType(out, structBase->entry->getQualType());
301
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 4622 return out.str();
302 2311 }
303
304
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 4622 std::string NameMangling::mangleTypeInfoValue(const std::string &value) { return std::to_string(value.size()) + value; }
305
306 3360 std::string NameMangling::mangleTypeInfo(const StructBase *structBase) {
307
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 3360 std::stringstream out;
308
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 3360 out << "_ZTI";
309
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 3360 mangleType(out, structBase->entry->getQualType());
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 6720 return out.str();
311 3360 }
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313 4622 std::string NameMangling::mangleVTable(const StructBase *structBase) {
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 4622 std::stringstream out;
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 4622 out << "_ZTV";
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 4622 mangleType(out, structBase->entry->getQualType());
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 9244 return out.str();
318 4622 }
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320 2216 std::string NameMangling::mangleVTable(const std::string &typeName) {
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 4432 return "_ZTV" + std::to_string(typeName.size()) + typeName;
322 }
323
324 } // namespace spice::compiler
325