GCC Code Coverage Report

Directory: ../
Coverage: low: ≥ 0% medium: ≥ 75.0% high: ≥ 90.0%
Coverage Exec / Excl / Total
Lines: 94.0% 173 / 3 / 187
Functions: 100.0% 16 / 0 / 16
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 <model/Union.h>
12 #include <symboltablebuilder/SymbolTableEntry.h>
13 #include <symboltablebuilder/Type.h>
14 #include <util/CommonUtil.h>
15
16 namespace spice::compiler {
17
18 #ifndef NDEBUG
19 /**
20 * Recursively check whether a type contains a function or procedure type anywhere - directly or nested as a
21 * struct template argument (e.g. Lambda<p()>). Spice mangles function/procedure types in a way that is not valid
22 * Itanium ABI, so such signatures must be excluded from the demangle-based sanity check in mangleFunction.
23 */
24 537852 static bool containsFctOrProcType(const QualType &type) {
25
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 537852 const QualType base = type.getBase();
26
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 537852 if (base.isOneOf({TY_FUNCTION, TY_PROCEDURE}))
27 3753 return true;
28
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 534099 if (base.is(TY_STRUCT)) {
29 38480 const auto pred = [](const QualType &templateType) { return containsFctOrProcType(templateType); };
30
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 108240 return std::ranges::any_of(base.getTemplateTypes(), pred);
31 }
32 425859 return false;
33 }
34 #endif
35
36 /**
37 * Mangle a function or procedure.
38 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
39 *
40 * @param spiceFunc Input function
41 * @return Mangled name
42 */
43 214356 std::string NameMangling::mangleFunction(const Function &spiceFunc) {
44 // Check if we have a predefined mangled name, specified by e.g. a function attribute
45
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 214356 if (!spiceFunc.predefinedMangledName.empty())
46 ✗ return spiceFunc.predefinedMangledName;
47
48 // Check if mangling is required
49
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 214356 if (!spiceFunc.mangleFunctionName)
50 ✗ return spiceFunc.name;
51
52
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 214356 std::stringstream mangledName;
53
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 214356 mangledName << "_Z";
54
55 // This type
56
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 214356 if (spiceFunc.isMethod()) {
57
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 140988 mangledName << "N";
58
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 140988 mangleType(mangledName, spiceFunc.thisType);
59 }
60
61 // Function name
62
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 214356 const std::string name = spiceFunc.name + spiceFunc.mangleSuffix;
63
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 214356 mangledName << name.length() << name;
64
65 // Template types
66
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 214356 bool isSelfGeneric = !spiceFunc.templateTypes.empty();
67
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 214356 if (spiceFunc.isMethod())
68
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 140988 isSelfGeneric = spiceFunc.templateTypes.size() > spiceFunc.thisType.getTemplateTypes().size();
69
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 214356 if (isSelfGeneric) {
70
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 17690 mangledName << "I";
71 // Template types themselves
72
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 59819 for (const GenericType &genericTemplateType : spiceFunc.templateTypes) {
73
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 24439 assert(spiceFunc.typeMapping.contains(genericTemplateType.getSubType()));
74
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 24439 const QualType &actualType = spiceFunc.typeMapping.at(genericTemplateType.getSubType());
75
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 24439 mangleType(mangledName, actualType);
76 }
77
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 17690 mangledName << "E";
78
79 // Insert second end marker to end the nested type
80
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 17690 if (spiceFunc.isMethod())
81
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 2999 mangledName << "E";
82
83 // Return type
84
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 17690 if (spiceFunc.isFunction())
85
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 7799 mangleType(mangledName, spiceFunc.returnType);
86 else
87
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 9891 mangledName << "v";
88
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 196666 } else if (spiceFunc.isMethod()) {
89
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 137989 mangledName << "E";
90 }
91
92 // Parameter types
93
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 630360 for (const auto &[qualType, isOptional] : spiceFunc.paramList) {
94
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 201648 assert(!isOptional);
95
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 201648 mangleType(mangledName, qualType);
96 }
97
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 214356 if (spiceFunc.paramList.empty())
98
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 83764 mangledName << "v";
99
100 #ifndef NDEBUG
101 214356 const TypeMapping &typeMapping = spiceFunc.typeMapping;
102
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 214356 const bool returnTypeIsFctOrProc = containsFctOrProcType(spiceFunc.returnType);
103 201334 const auto paramPredicate = [](const Param &p) { return containsFctOrProcType(p.qualType); };
104
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 214356 const bool paramTypeIsFctOrProc = std::ranges::any_of(spiceFunc.paramList, paramPredicate);
105 298038 const auto templateTypePredicate = [&](const GenericType &t) {
106
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 83682 if (t.is(TY_GENERIC)) {
107
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 80788 assert(typeMapping.contains(t.getSubType()));
108 80788 return containsFctOrProcType(typeMapping.at(t.getSubType()));
109 }
110 2894 return containsFctOrProcType(t);
111 214356 };
112
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 214356 const bool templateTypeIsFctOrProc = std::ranges::any_of(spiceFunc.templateTypes, templateTypePredicate);
113
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 214356 if (!returnTypeIsFctOrProc && !paramTypeIsFctOrProc && !templateTypeIsFctOrProc)
114
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 211494 assert(CommonUtil::isValidMangledName(mangledName.str()));
115 #endif
116
117
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 214356 return mangledName.str();
118 214356 }
119
120 /**
121 * Mangle a struct
122 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
123 *
124 * @param spiceStruct Input struct
125 * @return Mangled name
126 */
127 12697 std::string NameMangling::mangleStruct(const Struct &spiceStruct) { return "struct." + spiceStruct.name; }
128
129 /**
130 * Mangle an interface
131 *
132 * @param spiceInterface Input interface
133 * @return Mangled name
134 */
135 1148 std::string NameMangling::mangleInterface(const Interface &spiceInterface) { return "interface." + spiceInterface.name; }
136
137 /**
138 * Mangle a union
139 *
140 * @param spiceUnion Input union
141 * @return Mangled name
142 */
143 22 std::string NameMangling::mangleUnion(const Union &spiceUnion) { return "union." + spiceUnion.name; }
144
145 /**
146 * Mangle a fully qualified name like e.g. test::s1::calledMethod to 4test2s112calledMethod
147 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
148 *
149 * @param out Output string stream
150 * @param name Input name
151 * @param nestedType True if the name is a nested type
152 * @return Mangled name
153 */
154 244156 void NameMangling::mangleName(std::stringstream &out, const std::string &name, bool &nestedType) {
155 244156 std::vector<std::string> fragments;
156
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 244156 std::istringstream ss(name);
157 244156 std::string token;
158
159
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 488312 while (std::getline(ss, token, ':')) {
160
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 244156 std::istringstream subStream(token);
161 244156 std::string subToken;
162
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 488312 while (std::getline(subStream, subToken, '/')) {
163
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 244156 fragments.push_back(subToken);
164 }
165 244156 }
166
167 // Start a nested type if needed. The caller needs to emit the end marker.
168
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 244156 if (fragments.size() > 1) {
169 ✗ out << "N";
170 ✗ nestedType = true;
171 }
172
173 // Process each fragment and append it to the result
174
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 732468 for (const std::string &fragment : fragments) {
175 244156 int fragmentLength = static_cast<int>(fragment.length());
176
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 244156 out << std::to_string(fragmentLength) << fragment;
177 }
178 244156 }
179
180 /**
181 * Mangle a symbol qualType
182 * This should be mostly compatible with the C++ Itanium ABI name mangling scheme.
183 *
184 * @param out Output string stream
185 * @param qualType Input symbol qualType
186 * @return Mangled name
187 */
188 488155 void NameMangling::mangleType(std::stringstream &out, const QualType &qualType) { // NOLINT(*-no-recursion)
189 488155 const Type *type = qualType.getType();
190
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 488155 assert(!qualType.hasAnyGenericParts());
191
192 // Unwrap qualType chain
193
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 488155 assert(!type->typeChain.empty());
194
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 578869 for (size_t i = type->typeChain.size() - 1; i >= 1; i--)
195 90714 mangleTypeChainElement(out, type->typeChain.at(i), false);
196
197 // Qualifiers
198
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 488155 assert(qualType.getQualifiers().isSigned == !qualType.getQualifiers().isUnsigned);
199 488155 const bool signedness = qualType.getQualifiers().isSigned;
200 // The 'heap' qualifier has no equivalent in the C++ Itanium ABI, but it changes the semantics of the type (ownership), so
201 // it must be reflected in the mangled name. Otherwise e.g. 'byte*' and 'heap byte*' manifestations of the same generic
202 // function would collide on the same mangled name. Piggyback on the 'volatile' cv-qualifier slot ('V', ordered before
203 // 'K' per the Itanium <CV-qualifiers> grammar) so demangling still succeeds.
204
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 488155 if (qualType.getQualifiers().isHeap)
205 18047 out << "V";
206
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 488155 if (qualType.getQualifiers().isConst && type->typeChain.size() > 1)
207 40873 out << "K";
208
209 // Base chain element
210 488155 mangleTypeChainElement(out, type->typeChain.front(), signedness);
211 488155 }
212
213 /**
214 * Mangle a type chain element
215 *
216 * @param out Output string stream
217 * @param chainElement Input type chain element
218 * @param signedness Signedness of the type
219 * @return Mangled name
220 */
221 578869 void NameMangling::mangleTypeChainElement(std::stringstream &out, const TypeChainElement &chainElement, bool signedness) {
222
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 578869 switch (chainElement.superType) {
223 30621 case TY_PTR:
224
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 30621 out << "P";
225 30621 break;
226 837 case TY_ARRAY:
227
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 837 if (chainElement.data.arraySize == ARRAY_SIZE_UNKNOWN)
228
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 659 out << "P";
229 else
230
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 178 out << "A" << chainElement.data.arraySize << "_";
231 837 break;
232 59256 case TY_REF:
233
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 59256 out << "R";
234 59256 break;
235 7150 case TY_DOUBLE:
236
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 7150 assert(signedness && "Unsigned double types are forbidden");
237
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 7150 out << "d";
238 7150 break;
239 65512 case TY_INT:
240
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 65512 out << (signedness ? "i" : "j");
241 65512 break;
242 6934 case TY_SHORT:
243
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 6934 out << (signedness ? "s" : "t");
244 6934 break;
245 39394 case TY_LONG:
246
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 39394 out << (signedness ? "l" : "m");
247 39394 break;
248 22551 case TY_BYTE:
249
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 22551 out << (signedness ? "a" : "h");
250 22551 break;
251 30255 case TY_CHAR:
252
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 30255 out << "c";
253 30255 break;
254 54791 case TY_STRING:
255
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 54791 out << "PKc";
256 54791 break;
257 13650 case TY_BOOL:
258
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 13650 assert(!signedness && "Signed bool types are forbidden");
259
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 13650 out << "b";
260 13650 break;
261 244156 case TY_STRUCT: // fall-through
262 case TY_INTERFACE: // fall-through
263 case TY_UNION: {
264 244156 bool nestedType = false;
265 // Append a disambiguation suffix for same-named but distinct structs/interfaces/unions (see issue #1253), so
266 // that two independent types sharing a name do not end up with the same mangled name (and thus clash at link
267 // time).
268 244156 const std::string name =
269
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 244156 chainElement.subType + TypeNameDisambiguator::getDisambiguationSuffix(chainElement.subType, chainElement.typeId);
270
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 244156 mangleName(out, name, nestedType);
271
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 244156 if (!chainElement.templateTypes.empty()) {
272
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 85653 out << "I";
273
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 271704 for (const QualType &templateType : chainElement.templateTypes)
274
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 100398 mangleType(out, templateType);
275
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 85653 out << "E";
276 }
277
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 244156 if (nestedType)
278 ✗ out << "E";
279 244156 break;
280 244156 }
281 ✗ case TY_ENUM: {
282 ✗ bool nestedType = false;
283 ✗ mangleName(out, chainElement.subType, nestedType);
284 ✗ if (nestedType)
285 ✗ out << "E";
286 ✗ break;
287 }
288 314 case TY_FUNCTION: {
289
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 314 out << (chainElement.data.hasCaptures ? "PFC" : "PF");
290
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 1343 for (const QualType &paramType : chainElement.paramTypes)
291
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 715 mangleType(out, paramType);
292
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 314 out << "E";
293 314 break;
294 }
295 3448 case TY_PROCEDURE: {
296
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 3448 out << (chainElement.data.hasCaptures ? "PFCv" : "PFv");
297
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 5756 for (size_t i = 1; i < chainElement.paramTypes.size(); i++)
298
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 2308 mangleType(out, chainElement.paramTypes.at(i));
299
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 3448 out << "E";
300 3448 break;
301 }
302 − default: // GCOV_EXCL_LINE
303 − const std::string message = "Type " + chainElement.getName(false, true, true) + " cannot be mangled"; // GCOV_EXCL_LINE
304 − throw CompilerError(INTERNAL_ERROR, message); // GCOV_EXCL_LINE
305 }
306 578869 }
307
308 2211 std::string NameMangling::mangleTypeInfoName(const StructBase *structBase) {
309
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 2211 std::stringstream out;
310
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 2211 out << "_ZTS";
311
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 2211 mangleType(out, structBase->entry->getQualType());
312
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 4422 return out.str();
313 2211 }
314
315
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 4422 std::string NameMangling::mangleTypeInfoValue(const std::string &value) { return std::to_string(value.size()) + value; }
316
317 3227 std::string NameMangling::mangleTypeInfo(const StructBase *structBase) {
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 3227 std::stringstream out;
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 3227 out << "_ZTI";
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 3227 mangleType(out, structBase->entry->getQualType());
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 6454 return out.str();
322 3227 }
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324 4422 std::string NameMangling::mangleVTable(const StructBase *structBase) {
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 4422 std::stringstream out;
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 4422 out << "_ZTV";
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 4422 mangleType(out, structBase->entry->getQualType());
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 8844 return out.str();
329 4422 }
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331 2014 std::string NameMangling::mangleVTable(const std::string &typeName) {
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 4028 return "_ZTV" + std::to_string(typeName.size()) + typeName;
333 }
334
335 } // namespace spice::compiler
336