GCC Code Coverage Report

Directory: ../
Coverage: low: ≥ 0% medium: ≥ 75.0% high: ≥ 90.0%
Coverage Exec / Excl / Total
Lines: 93.9% 170 / 3 / 184
Functions: 100.0% 15 / 0 / 15
Branches: 60.3% 181 / 8 / 308
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 282886 static bool containsFctOrProcType(const QualType &type) {
24
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 282886 const QualType base = type.getBase();
25
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 282886 if (base.isOneOf({TY_FUNCTION, TY_PROCEDURE}))
26 921 return true;
27
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 281965 if (base.is(TY_STRUCT)) {
28 34683 const auto pred = [](const QualType &templateType) { return containsFctOrProcType(templateType); };
29
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 90849 return std::ranges::any_of(base.getTemplateTypes(), pred);
30 }
31 191116 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 107784 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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 107784 if (!spiceFunc.predefinedMangledName.empty())
45 ✗ return spiceFunc.predefinedMangledName;
46
47 // Check if mangling is required
48
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 107784 if (!spiceFunc.mangleFunctionName)
49 ✗ return spiceFunc.name;
50
51
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 107784 std::stringstream mangledName;
52
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 107784 mangledName << "_Z";
53
54 // This type
55
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 107784 if (spiceFunc.isMethod()) {
56
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 79235 mangledName << "N";
57
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 79235 mangleType(mangledName, spiceFunc.thisType);
58 }
59
60 // Function name
61
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 107784 const std::string name = spiceFunc.name + spiceFunc.mangleSuffix;
62
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 107784 mangledName << name.length() << name;
63
64 // Template types
65
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 107784 bool isSelfGeneric = !spiceFunc.templateTypes.empty();
66
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 107784 if (spiceFunc.isMethod())
67
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 79235 isSelfGeneric = spiceFunc.templateTypes.size() > spiceFunc.thisType.getTemplateTypes().size();
68
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 107784 if (isSelfGeneric) {
69
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 8087 mangledName << "I";
70 // Template types themselves
71
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 28095 for (const GenericType &genericTemplateType : spiceFunc.templateTypes) {
72
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 11921 assert(spiceFunc.typeMapping.contains(genericTemplateType.getSubType()));
73
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 11921 const QualType &actualType = spiceFunc.typeMapping.at(genericTemplateType.getSubType());
74
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 11921 mangleType(mangledName, actualType);
75 }
76
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 8087 mangledName << "E";
77
78 // Insert second end marker to end the nested type
79
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 8087 if (spiceFunc.isMethod())
80
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 2495 mangledName << "E";
81
82 // Return type
83
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 8087 if (spiceFunc.isFunction())
84
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 4286 mangleType(mangledName, spiceFunc.returnType);
85 else
86
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 3801 mangledName << "v";
87
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 99697 } else if (spiceFunc.isMethod()) {
88
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 76740 mangledName << "E";
89 }
90
91 // Parameter types
92
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 312142 for (const auto &[qualType, isOptional] : spiceFunc.paramList) {
93
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 96574 assert(!isOptional);
94
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 96574 mangleType(mangledName, qualType);
95 }
96
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 107784 if (spiceFunc.paramList.empty())
97
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 42105 mangledName << "v";
98
99 #ifndef NDEBUG
100 107784 const TypeMapping &typeMapping = spiceFunc.typeMapping;
101
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 107784 const bool returnTypeIsFctOrProc = containsFctOrProcType(spiceFunc.returnType);
102 96480 const auto paramPredicate = [](const Param &p) { return containsFctOrProcType(p.qualType); };
103
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 107784 const bool paramTypeIsFctOrProc = std::ranges::any_of(spiceFunc.paramList, paramPredicate);
104 151723 const auto templateTypePredicate = [&](const GenericType &t) {
105
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 43939 if (t.is(TY_GENERIC)) {
106
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 43935 assert(typeMapping.contains(t.getSubType()));
107 43935 return containsFctOrProcType(typeMapping.at(t.getSubType()));
108 }
109 4 return containsFctOrProcType(t);
110 107784 };
111
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 107784 const bool templateTypeIsFctOrProc = std::ranges::any_of(spiceFunc.templateTypes, templateTypePredicate);
112
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 107784 if (!returnTypeIsFctOrProc && !paramTypeIsFctOrProc && !templateTypeIsFctOrProc)
113
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 107090 assert(CommonUtil::isValidMangledName(mangledName.str()));
114 #endif
115
116
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 107784 return mangledName.str();
117 107784 }
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 9308 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 1189 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 174486 void NameMangling::mangleName(std::stringstream &out, const std::string &name, bool &nestedType) {
146 174486 std::vector<std::string> fragments;
147
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 174486 std::istringstream ss(name);
148 174486 std::string token;
149
150
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 348972 while (std::getline(ss, token, ':')) {
151
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 174486 std::istringstream subStream(token);
152 174486 std::string subToken;
153
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 348972 while (std::getline(subStream, subToken, '/')) {
154
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 174486 fragments.push_back(subToken);
155 }
156 174486 }
157
158 // Start a nested type if needed. The caller needs to emit the end marker.
159
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 174486 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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 523458 for (const std::string &fragment : fragments) {
166 174486 int fragmentLength = static_cast<int>(fragment.length());
167
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 174486 out << std::to_string(fragmentLength) << fragment;
168 }
169 174486 }
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 276068 void NameMangling::mangleType(std::stringstream &out, const QualType &qualType) { // NOLINT(*-no-recursion)
180 276068 const Type *type = qualType.getType();
181
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 276068 assert(!qualType.hasAnyGenericParts());
182
183 // Unwrap qualType chain
184
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 276068 assert(!type->typeChain.empty());
185
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 329867 for (size_t i = type->typeChain.size() - 1; i >= 1; i--)
186 53799 mangleTypeChainElement(out, type->typeChain.at(i), false);
187
188 // Qualifiers
189
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 276068 assert(qualType.getQualifiers().isSigned == !qualType.getQualifiers().isUnsigned);
190 276068 const bool signedness = qualType.getQualifiers().isSigned;
191
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 276068 if (qualType.getQualifiers().isConst && type->typeChain.size() > 1)
192 21888 out << "K";
193
194 // Base chain element
195 276068 mangleTypeChainElement(out, type->typeChain.front(), signedness);
196 276068 }
197
198 /**
199 * Mangle a type chain element
200 *
201 * @param out Output string stream
202 * @param chainElement Input type chain element
203 * @param signedness Signedness of the type
204 * @return Mangled name
205 */
206 329867 void NameMangling::mangleTypeChainElement(std::stringstream &out, const TypeChainElement &chainElement, bool signedness) {
207
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 329867 switch (chainElement.superType) {
208 23696 case TY_PTR:
209
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 23696 out << "P";
210 23696 break;
211 409 case TY_ARRAY:
212
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 409 if (chainElement.data.arraySize == ARRAY_SIZE_UNKNOWN)
213
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 349 out << "P";
214 else
215
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 60 out << "A" << chainElement.data.arraySize << "_";
216 409 break;
217 29694 case TY_REF:
218
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 29694 out << "R";
219 29694 break;
220 3238 case TY_DOUBLE:
221
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 3238 assert(signedness && "Unsigned double types are forbidden");
222
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 3238 out << "d";
223 3238 break;
224 24988 case TY_INT:
225
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 24988 out << (signedness ? "i" : "j");
226 24988 break;
227 3071 case TY_SHORT:
228
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 3071 out << (signedness ? "s" : "t");
229 3071 break;
230 20511 case TY_LONG:
231
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 20511 out << (signedness ? "l" : "m");
232 20511 break;
233 7359 case TY_BYTE:
234
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 7359 out << (signedness ? "a" : "h");
235 7359 break;
236 11785 case TY_CHAR:
237
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 11785 out << "c";
238 11785 break;
239 23021 case TY_STRING:
240
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 23021 out << "PKc";
241 23021 break;
242 6695 case TY_BOOL:
243
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 6695 assert(!signedness && "Signed bool types are forbidden");
244
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 6695 out << "b";
245 6695 break;
246 174486 case TY_STRUCT: // fall-through
247 case TY_INTERFACE: {
248 174486 bool nestedType = false;
249 // Append a disambiguation suffix for same-named but distinct structs/interfaces (see issue #1253), so that two
250 // independent types sharing a name do not end up with the same mangled name (and thus clash at link time).
251 174486 const std::string name =
252
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 174486 chainElement.subType + TypeNameDisambiguator::getDisambiguationSuffix(chainElement.subType, chainElement.typeId);
253
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 174486 mangleName(out, name, nestedType);
254
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 174486 if (!chainElement.templateTypes.empty()) {
255
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 59879 out << "I";
256
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 193065 for (const QualType &templateType : chainElement.templateTypes)
257
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 73307 mangleType(out, templateType);
258
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 59879 out << "E";
259 }
260
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 174486 if (nestedType)
261 ✗ out << "E";
262 174486 break;
263 174486 }
264 ✗ case TY_ENUM: {
265 ✗ bool nestedType = false;
266 ✗ mangleName(out, chainElement.subType, nestedType);
267 ✗ if (nestedType)
268 ✗ out << "E";
269 ✗ break;
270 }
271 93 case TY_FUNCTION: {
272
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 93 out << (chainElement.data.hasCaptures ? "PFC" : "PF");
273
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 398 for (const QualType &paramType : chainElement.paramTypes)
274
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 212 mangleType(out, paramType);
275
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 93 out << "E";
276 93 break;
277 }
278 821 case TY_PROCEDURE: {
279
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 821 out << (chainElement.data.hasCaptures ? "PFCv" : "PFv");
280
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 1333 for (size_t i = 1; i < chainElement.paramTypes.size(); i++)
281
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 512 mangleType(out, chainElement.paramTypes.at(i));
282
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 821 out << "E";
283 821 break;
284 }
285 − default: // GCOV_EXCL_LINE
286 − const std::string message = "Type " + chainElement.getName(false, true, true) + " cannot be mangled"; // GCOV_EXCL_LINE
287 − throw CompilerError(INTERNAL_ERROR, message); // GCOV_EXCL_LINE
288 }
289 329867 }
290
291 2250 std::string NameMangling::mangleTypeInfoName(const StructBase *structBase) {
292
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 2250 std::stringstream out;
293
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 2250 out << "_ZTS";
294
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 2250 mangleType(out, structBase->entry->getQualType());
295
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 4500 return out.str();
296 2250 }
297
298
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 4500 std::string NameMangling::mangleTypeInfoValue(const std::string &value) { return std::to_string(value.size()) + value; }
299
300 3271 std::string NameMangling::mangleTypeInfo(const StructBase *structBase) {
301
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 3271 std::stringstream out;
302
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 3271 out << "_ZTI";
303
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 3271 mangleType(out, structBase->entry->getQualType());
304
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 6542 return out.str();
305 3271 }
306
307 4500 std::string NameMangling::mangleVTable(const StructBase *structBase) {
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 4500 std::stringstream out;
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 4500 out << "_ZTV";
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 4500 mangleType(out, structBase->entry->getQualType());
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 9000 return out.str();
312 4500 }
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314 2159 std::string NameMangling::mangleVTable(const std::string &typeName) {
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 4318 return "_ZTV" + std::to_string(typeName.size()) + typeName;
316 }
317
318 } // namespace spice::compiler
319