GCC Code Coverage Report

Directory: ../
Coverage: low: ≥ 0% medium: ≥ 75.0% high: ≥ 90.0%
Coverage Exec / Excl / Total
Lines: 98.0% 339 / 0 / 346
Functions: 100.0% 27 / 0 / 27
Branches: 66.5% 440 / 0 / 662
src/typechecker/FunctionManager.cpp
Line Branch Exec Source
1 // Copyright (c) 2021-2026 ChilliBits. All rights reserved.
2
3 #include "FunctionManager.h"
4
5 #include <limits>
6
7 #include <ast/ASTNodes.h>
8 #include <exception/SemanticError.h>
9 #include <model/GenericType.h>
10 #include <symboltablebuilder/Scope.h>
11 #include <symboltablebuilder/SymbolTableBuilder.h>
12 #include <typechecker/TypeChecker.h>
13 #include <typechecker/TypeMatcher.h>
14 #include <util/CodeLoc.h>
15 #include <util/CustomHashFunctions.h>
16
17 namespace spice::compiler {
18
19 // Static member initialization
20 std::unordered_map<uint64_t, Function *> FunctionManager::lookupCache = {};
21 size_t FunctionManager::lookupCacheHits = 0;
22 size_t FunctionManager::lookupCacheMisses = 0;
23
24 38127 Function *FunctionManager::insert(Scope *insertScope, const Function &baseFunction, std::vector<Function *> *nodeFunctionList) {
25 // Open a new manifestation list for the function definition
26
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 38127 const std::string fctId = baseFunction.name + ":" + baseFunction.declNode->codeLoc.toPrettyLineAndColumn();
27
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 38127 insertScope->functions.emplace(fctId, FunctionManifestationList());
28
29 // Collect substantiations
30 38127 std::vector<Function> manifestations;
31
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 38127 substantiateOptionalParams(baseFunction, manifestations);
32
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 38127 assert(!manifestations.empty());
33
34 // Save substantiations in declaration node
35 38127 Function *manifestationPtr = nullptr;
36
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 116625 for (const Function &manifestation : manifestations) {
37
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 40373 manifestationPtr = insertSubstantiation(insertScope, manifestation, baseFunction.declNode);
38
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 40371 assert(manifestationPtr != nullptr);
39
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 40371 if (nodeFunctionList)
40
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 40371 nodeFunctionList->push_back(manifestationPtr);
41 }
42
43
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 38125 if (!nodeFunctionList)
44 ✗ return manifestationPtr;
45
46
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 38125 assert(!nodeFunctionList->empty());
47 38125 return nodeFunctionList->front();
48 38129 }
49
50 /**
51 * Create definite functions from ambiguous ones, in regard to optional arguments.
52 *
53 * Example:
54 * int testFunc(string, int?, double?)
55 * gets
56 * int testFunc(string)
57 * int testFunc(string, int)
58 * int testFunc(string, int, double)
59 *
60 * This method also accepts functions, that are already definite, but does nothing to them.
61 *
62 * @param baseFunction Ambiguous base function
63 * @param manifestations Vector to store the definite manifestations
64 * @return True, if there were optional arguments found
65 */
66 38127 void FunctionManager::substantiateOptionalParams(const Function &baseFunction, std::vector<Function> &manifestations) {
67 // Handle the case of no parameters -> simply return the base function
68
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 38127 if (baseFunction.paramList.empty()) {
69
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 10312 manifestations.push_back(baseFunction);
70 10312 return;
71 }
72
73 27815 ParamList currentFunctionParamTypes;
74
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 27815 currentFunctionParamTypes.reserve(baseFunction.paramList.size());
75 27815 bool metFirstOptionalParam = false;
76
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 27815 Function manifestation = baseFunction;
77
78 // Loop over all parameters
79
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 97546 for (const auto &[qualType, isOptional] : baseFunction.paramList) {
80 // Check if we have a mandatory parameter
81
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 41916 if (!isOptional) {
82
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 39670 currentFunctionParamTypes.push_back({qualType, /*optional=*/false});
83 39670 continue;
84 }
85
86 // Add substantiation without the optional parameter
87
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 2246 if (!metFirstOptionalParam) {
88
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 2132 manifestation.paramList = currentFunctionParamTypes;
89
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 2132 manifestations.push_back(manifestation);
90 // Now we cannot accept mandatory parameters anymore
91 2132 metFirstOptionalParam = true;
92 }
93
94 // Add substantiation with the optional parameter
95
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 2246 currentFunctionParamTypes.push_back({qualType, /*optional=*/false});
96
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 2246 manifestation.paramList = currentFunctionParamTypes;
97
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 2246 manifestations.push_back(manifestation);
98 }
99
100 // Ensure at least once manifestation
101
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 27815 if (manifestations.empty())
102
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 25683 manifestations.push_back(baseFunction);
103 27815 }
104
105 6 Function FunctionManager::createMainFunction(SymbolTableEntry *entry, const QualTypeList &paramTypes, ASTNode *declNode) {
106 6 ParamList paramList;
107
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 14 for (const QualType &paramType : paramTypes)
108
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 2 paramList.push_back({paramType, false});
109
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 18 return {MAIN_FUNCTION_NAME, entry, QualType(TY_DYN), QualType(TY_INT), paramList, {}, declNode};
110 6 }
111
112 51395 Function *FunctionManager::insertSubstantiation(Scope *insertScope, const Function &newManifestation, const ASTNode *declNode) {
113
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 51395 assert(newManifestation.hasSubstantiatedParams());
114
115
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 51395 const std::string signature = newManifestation.getSignature(true, true, false, true);
116
117 // Check if the function exists already
118
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 896904 for (const auto &manifestations : insertScope->functions | std::views::values) {
119
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 845511 if (manifestations.contains(signature)) {
120
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 2 const SemanticErrorType errorType = newManifestation.isFunction() ? FUNCTION_DECLARED_TWICE : PROCEDURE_DECLARED_TWICE;
121
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 2 throw SemanticError(declNode, errorType, "'" + newManifestation.getSignature(true, false) + "' is declared twice");
122 }
123 }
124
125 // Retrieve the matching manifestation list of the scope
126
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 51393 const std::string fctId = newManifestation.name + ":" + declNode->codeLoc.toPrettyLineAndColumn();
127
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 51393 assert(insertScope->functions.contains(fctId));
128
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 51393 FunctionManifestationList &manifestationList = insertScope->functions.at(fctId);
129
130 // Add substantiated function
131
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 51393 manifestationList.emplace(signature, newManifestation);
132
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 102786 return &manifestationList.at(signature);
133 51395 }
134
135 /**
136 * Checks if a function exists by matching it, but not setting it to used
137 *
138 * @param matchScope Scope to match against
139 * @param reqName Function name requirement
140 * @param reqThisType This type requirement
141 * @param reqArgs Argument requirement
142 * @param strictQualifierMatching Match argument and this type qualifiers strictly
143 * @return Found function or nullptr
144 */
145 38828 const Function *FunctionManager::lookup(Scope *matchScope, const std::string &reqName, const QualType &reqThisType,
146 const ArgList &reqArgs, bool strictQualifierMatching) {
147
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 38828 assert(reqThisType.isOneOf({TY_DYN, TY_STRUCT}));
148
149 // Do cache lookup
150 38828 const uint64_t cacheKey = getCacheKey(matchScope, reqName, reqThisType, reqArgs, {});
151
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 38828 if (const auto it = lookupCache.find(cacheKey); it != lookupCache.end()) {
152 8236 lookupCacheHits++;
153 8236 return it->second;
154 }
155 30592 lookupCacheMisses++;
156
157 10313 const auto pred = [&](const Arg &arg) { return arg.first.hasAnyGenericParts(); };
158
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 30592 const bool requestedFullySubstantiated = !reqThisType.hasAnyGenericParts() && std::ranges::none_of(reqArgs, pred);
159
160 // Loop over function registry to find functions, that match the requirements of the call
161 30592 std::vector<const Function *> matches;
162
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 251918 for (const auto &[defCodeLocStr, manifestations] : matchScope->functions) {
163
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 356131 for (const auto &[signature, presetFunction] : manifestations) {
164
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 255982 assert(presetFunction.hasSubstantiatedParams()); // No optional params are allowed at this point
165
166 // - search for concrete fct: Only match against fully substantiated versions to prevent double matching of a function
167 // - search for generic fct: Only match against generic preset functions
168
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 255982 if (presetFunction.isFullySubstantiated() != requestedFullySubstantiated)
169 134805 continue;
170
171 // Copy the function to be able to substantiate types
172
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 147363 Function candidate = presetFunction;
173
174 // Create empty type mapping
175 147363 TypeMapping &typeMapping = candidate.typeMapping;
176
177 147363 bool forceSubstantiation = false;
178
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 147363 const MatchResult matchResult = matchManifestation(candidate, matchScope, reqName, reqThisType, reqArgs, typeMapping,
179 strictQualifierMatching, forceSubstantiation, nullptr);
180
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 147363 if (matchResult == MatchResult::SKIP_FUNCTION)
181 112534 break; // Leave the whole function
182
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 34829 if (matchResult == MatchResult::SKIP_MANIFESTATION)
183 26186 continue; // Leave this manifestation and try the next one
184
185 // Add to matches
186
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 8643 matches.push_back(&matchScope->functions.at(defCodeLocStr).at(signature));
187
188 8643 break; // Leave the whole manifestation list to not double-match the manifestation
189
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 147363 }
190 }
191
192 // Return the very match or a nullptr
193
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 30592 return !matches.empty() ? matches.front() : nullptr;
194 30592 }
195
196 /**
197 * Check if there is a function in the scope, fulfilling all given requirements and if found, return it.
198 * If more than one function matches the requirement, an error gets thrown.
199 *
200 * @param matchScope Scope to match against
201 * @param reqName Function name requirement
202 * @param reqThisType This type requirement
203 * @param reqArgs Argument requirement
204 * @param templateTypeHints Template type requirement
205 * @param strictQualifierMatching Match argument and this type qualifiers strictly
206 * @param callNode Call AST node for printing error messages
207 * @return Matched function or nullptr
208 */
209 387743 Function *FunctionManager::match(Scope *matchScope, const std::string &reqName, const QualType &reqThisType,
210 const ArgList &reqArgs, const QualTypeList &templateTypeHints, bool strictQualifierMatching,
211 const ASTNode *callNode) {
212
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 387743 assert(reqThisType.isOneOf({TY_DYN, TY_STRUCT, TY_INTERFACE}));
213
214 // Do cache lookup
215 387743 const uint64_t cacheKey = getCacheKey(matchScope, reqName, reqThisType, reqArgs, templateTypeHints);
216
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 387743 if (const auto it = lookupCache.find(cacheKey); it != lookupCache.end()) {
217 56209 lookupCacheHits++;
218 56209 return it->second;
219 }
220 331534 lookupCacheMisses++;
221
222 // Loop over function registry to find functions, that match the requirements of the call
223 331534 std::vector<Function *> matches;
224
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 4006985 for (auto &[fctId, manifestations] : matchScope->functions) {
225
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 3918604 for (const auto &[signature, presetFunction] : manifestations) {
226
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 3777701 assert(presetFunction.hasSubstantiatedParams()); // No optional params are allowed at this point
227
228 // Skip generic and newly inserted substantiations to prevent double matching of a function
229
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 3777701 if (presetFunction.isGenericSubstantiation() || presetFunction.isNewlyInserted)
230 243152 continue;
231
232 // Copy the function to be able to substantiate types
233
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 3680091 Function candidate = presetFunction;
234
235 // Prepare type mapping, based on the given initial type mapping
236 3680091 TypeMapping &typeMapping = candidate.typeMapping;
237 3680091 typeMapping.clear();
238
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 3735379 for (size_t i = 0; i < std::min(templateTypeHints.size(), candidate.templateTypes.size()); i++) {
239
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 55288 const std::string &typeName = candidate.templateTypes.at(i).getSubType();
240
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 55288 const QualType &templateType = templateTypeHints.at(i);
241
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 55288 typeMapping.emplace(typeName, templateType);
242 }
243
244 3680091 bool forceSubstantiation = false;
245
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 3680091 const MatchResult matchResult = matchManifestation(candidate, matchScope, reqName, reqThisType, reqArgs, typeMapping,
246 strictQualifierMatching, forceSubstantiation, callNode);
247
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 3680090 if (matchResult == MatchResult::SKIP_FUNCTION)
248 3522442 break; // Leave the whole function
249
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 157648 if (matchResult == MatchResult::SKIP_MANIFESTATION)
250 130190 continue; // Leave this manifestation and try the next one
251
252 // We found a match! -> Set the actual candidate and its entry to used
253 27458 candidate.used = true;
254 27458 candidate.entry->used = true;
255
256 // Check if the function is generic needs to be substantiated
257
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 27458 if (presetFunction.templateTypes.empty() && !forceSubstantiation) {
258
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 15352 assert(matchScope->functions.contains(fctId) && matchScope->functions.at(fctId).contains(signature));
259
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 15352 Function *match = &matchScope->functions.at(fctId).at(signature);
260 15352 match->used = true;
261
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 15352 matches.push_back(match);
262 15352 continue; // Match was successful -> match the next function
263 15352 }
264
265 // Check if we already have this manifestation and can simply re-use it
266
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 12106 const std::string newSignature = candidate.getSignature(true, true, false, true);
267
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 12106 if (const auto it = manifestations.find(newSignature); it != manifestations.end()) {
268 1084 it->second.used = true;
269
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 1084 matches.push_back(&it->second);
270 1084 break; // Leave the whole manifestation list to not double-match the manifestation
271 }
272
273 // Insert the substantiated version if required
274
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 11022 Function *substantiatedFunction = insertSubstantiation(matchScope, candidate, presetFunction.declNode);
275
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 11022 substantiatedFunction->genericPreset = &matchScope->functions.at(fctId).at(signature);
276 11022 substantiatedFunction->alreadyTypeChecked = false;
277
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 11022 substantiatedFunction->declNode->getFctManifestations(reqName)->push_back(substantiatedFunction);
278 11022 substantiatedFunction->isNewlyInserted = true; // To not iterate over it in the same matching
279
280 // Copy function entry
281
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 11022 const std::string newScopeName = substantiatedFunction->getScopeName();
282
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 11022 matchScope->lookupStrict(presetFunction.entry->name)->used = true;
283
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 11022 substantiatedFunction->entry = matchScope->symbolTable.copySymbol(presetFunction.entry->name, newScopeName);
284
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 11022 assert(substantiatedFunction->entry != nullptr);
285
286 // Copy function scope
287
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 11022 const std::string oldScopeName = presetFunction.getScopeName();
288
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 11022 Scope *childScope = matchScope->copyChildScope(oldScopeName, newScopeName);
289
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 11022 assert(childScope != nullptr);
290 11022 childScope->isGenericScope = false;
291 11022 substantiatedFunction->bodyScope = childScope;
292
293 // Insert symbols for generic type names with concrete types into the child block
294
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 24895 for (const auto &[typeName, concreteType] : substantiatedFunction->typeMapping)
295
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 13873 childScope->insertGenericType(typeName, GenericType(concreteType));
296
297 // Substantiate the 'this' entry in the new function scope
298
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 11022 if (presetFunction.isMethod() && !presetFunction.templateTypes.empty()) {
299
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 27333 SymbolTableEntry *thisEntry = childScope->lookupStrict(THIS_VARIABLE_NAME);
300
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 9111 assert(thisEntry != nullptr);
301
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 9111 thisEntry->updateType(candidate.thisType.toPtr(callNode), /*overwriteExistingType=*/true);
302 }
303
304 // Add to matched functions
305
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 11022 matches.push_back(substantiatedFunction);
306
307 11022 break; // Leave the whole manifestation list to not double-match the manifestation
308
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 3692197 }
309 }
310
311 // If no matches were found, return a nullptr
312
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 331533 if (matches.empty())
313 304082 return nullptr;
314
315 // Tie-breaking: if multiple candidates match, narrow them by qualifier specificity (see breakOverloadTie).
316
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 27451 breakOverloadTie(matches, reqArgs);
317
318 // Check if more than one function matches the requirements
319
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 27451 if (matches.size() > 1) {
320
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 1 std::stringstream errorMessage;
321
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 1 errorMessage << "The function/procedure '" << reqName << "' is ambiguous. All of the following match the requested criteria:";
322
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 4 for (const Function *match : matches)
323
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 2 errorMessage << "\n " << match->getSignature();
324
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 1 throw SemanticError(callNode, FUNCTION_AMBIGUITY, errorMessage.str());
325 1 }
326 27450 Function *matchedFunction = matches.front();
327 27450 matchedFunction->isNewlyInserted = false;
328
329 // Insert into cache
330
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 27450 lookupCache[cacheKey] = matchedFunction;
331
332 // Trigger revisit in type checker if required
333
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 27450 TypeChecker::requestRevisitIfRequired(matchedFunction);
334
335 // Return the very match
336 27450 return matchedFunction;
337 331534 }
338
339 3827454 MatchResult FunctionManager::matchManifestation(Function &candidate, Scope *&matchScope, const std::string &reqName,
340 const QualType &reqThisType, const ArgList &reqArgs, TypeMapping &typeMapping,
341 bool strictQualifierMatching, bool &forceSubstantiation,
342 const ASTNode *callNode) {
343 // Check name requirement
344
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 3827454 if (!matchName(candidate, reqName))
345 3634976 return MatchResult::SKIP_FUNCTION; // Leave the whole manifestation list, because all have the same name
346
347 // Check 'this' type requirement
348
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 192478 if (!matchThisType(candidate, reqThisType, typeMapping, strictQualifierMatching, callNode))
349 ✗ return MatchResult::SKIP_MANIFESTATION; // Leave this manifestation and try the next one
350
351 // Check arg types requirement
352
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 192478 if (!matchArgTypes(candidate, reqArgs, typeMapping, strictQualifierMatching, forceSubstantiation, callNode))
353 156374 return MatchResult::SKIP_MANIFESTATION; // Leave this manifestation and try the next one
354
355 // Check if there are unresolved generic types
356
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 36103 if (typeMapping.size() < candidate.templateTypes.size())
357 2 return MatchResult::SKIP_MANIFESTATION; // Leave this manifestation and try the next one
358
359 // Substantiate return type
360 36101 substantiateReturnType(candidate, typeMapping, callNode);
361
362 // Set the match scope to the scope of the concrete substantiation
363 36101 const QualType &thisType = candidate.thisType;
364
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 36101 if (!thisType.is(TY_DYN)) {
365 // If we only have the generic struct scope, lookup the concrete manifestation scope
366
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 26326 if (matchScope->isGenericScope) {
367 118 const Struct *spiceStruct = thisType.getStruct(candidate.declNode);
368
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 118 assert(spiceStruct != nullptr);
369 118 matchScope = spiceStruct->scope;
370 }
371
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 26326 candidate.thisType = candidate.thisType.getWithBodyScope(matchScope);
372 }
373
374 36101 return MatchResult::MATCHED;
375 }
376
377 /**
378 * Checks if the matching candidate fulfills the name requirement
379 *
380 * @param candidate Matching candidate function
381 * @param reqName Requested function name
382 * @return Fulfilled or not
383 */
384 3827454 bool FunctionManager::matchName(const Function &candidate, const std::string &reqName) { return candidate.name == reqName; }
385
386 /**
387 * Checks if the matching candidate fulfills the 'this' type requirement
388 *
389 * @param candidate Matching candidate function
390 * @param reqThisType Requested 'this' type
391 * @param typeMapping Concrete template type mapping
392 * @param strictQualifierMatching Match qualifiers strictly
393 * @param callNode Call AST node for printing error messages
394 * @return Fulfilled or not
395 */
396 192478 bool FunctionManager::matchThisType(Function &candidate, const QualType &reqThisType, TypeMapping &typeMapping,
397 bool strictQualifierMatching, const ASTNode *callNode) {
398 192478 QualType &candidateThisType = candidate.thisType;
399
400 // Shortcut for procedures
401
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 192478 if (candidateThisType.is(TY_DYN) && reqThisType.is(TY_DYN))
402 120576 return true;
403
404 // Give the type matcher a way to retrieve instances of GenericType by their name
405 156537 TypeMatcher::ResolverFct genericTypeResolver = [&](const std::string &genericTypeName) {
406 12733 return getGenericTypeOfCandidateByName(candidate, genericTypeName);
407 71902 };
408
409 // Check if the requested 'this' type matches the candidate 'this' type. The type mapping may be extended
410
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 71902 if (!TypeMatcher::matchRequestedToCandidateType(candidateThisType, reqThisType, typeMapping, genericTypeResolver,
411 strictQualifierMatching))
412 ✗ return false;
413
414 // Substantiate the candidate param type, based on the type mapping
415
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 71902 if (candidateThisType.hasAnyGenericParts())
416
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 13839 TypeMatcher::substantiateTypeWithTypeMapping(candidateThisType, typeMapping, callNode);
417
418 71902 return true;
419 71902 }
420
421 /**
422 * Checks if the matching candidate fulfills the argument types requirement
423 *
424 * @param candidate Matching candidate function
425 * @param reqArgs Requested argument types
426 * @param typeMapping Concrete template type mapping
427 * @param strictQualifierMatching Match qualifiers strictly
428 * @param needsSubstantiation We want to create a substantiation after successfully matching
429 * @param callNode Call AST node for printing error messages
430 * @return Fulfilled or not
431 */
432 192478 bool FunctionManager::matchArgTypes(Function &candidate, const ArgList &reqArgs, TypeMapping &typeMapping,
433 bool strictQualifierMatching, bool &needsSubstantiation, const ASTNode *callNode) {
434 192478 std::vector<Param> &candidateParamList = candidate.paramList;
435
436 // If the number of arguments does not match with the number of params, the matching fails
437
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 192478 if (!candidate.isVararg && reqArgs.size() != candidateParamList.size())
438 31207 return false;
439 // In the case of a vararg function, we only disallow fewer arguments than parameters
440
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 161271 if (candidate.isVararg && reqArgs.size() < candidateParamList.size())
441 ✗ return false;
442
443 // Give the type matcher a way to retrieve instances of GenericType by their name
444 334190 TypeMatcher::ResolverFct genericTypeResolver = [&](const std::string &genericTypeName) {
445 11648 return getGenericTypeOfCandidateByName(candidate, genericTypeName);
446 161271 };
447
448 // Loop over all parameters
449
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 201963 for (size_t i = 0; i < reqArgs.size(); i++) {
450 // In the case of a vararg function candidate, we can accept additional arguments, that are not defined in the candidate,
451 // but we need to modify the candidate param list to accept them
452
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 165860 if (candidate.isVararg && i >= candidateParamList.size()) {
453
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 263 candidateParamList.push_back(Param(reqArgs.at(i).first, false));
454 263 needsSubstantiation = true; // We need to modify the candidate param types
455 263 continue;
456 }
457
458 // Retrieve actual and requested types
459
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 165597 assert(!candidateParamList.at(i).isOptional);
460
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 165597 QualType &candidateType = candidateParamList.at(i).qualType;
461
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 165597 const auto &[requestedType, isArgTemporary] = reqArgs.at(i);
462
463 // Check if the requested param type matches the candidate param type. The type mapping may be extended
464
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 165597 if (!TypeMatcher::matchRequestedToCandidateType(candidateType, requestedType, typeMapping, genericTypeResolver,
465 strictQualifierMatching))
466 125167 return false;
467
468 // Substantiate the candidate param type, based on the type mapping
469
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 40430 if (candidateType.hasAnyGenericParts())
470
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 9894 TypeMatcher::substantiateTypeWithTypeMapping(candidateType, typeMapping, callNode);
471
472 // Check if we try to bind a non-ref temporary to a non-const ref parameter
473
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 40430 if (!candidateType.canBind(requestedType, isArgTemporary)) {
474
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 1 if (callNode)
475
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 3 throw SemanticError(callNode, TEMP_TO_NON_CONST_REF, "Temporary values can only be bound to const reference parameters");
476 ✗ return false;
477 }
478
479 // If we have a function/procedure type we need to take care of the information, if it takes captures
480
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 40429 if (requestedType.getBase().isOneOf({TY_FUNCTION, TY_PROCEDURE}) && requestedType.hasLambdaCaptures()) {
481
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 9 candidateType = candidateType.getWithLambdaCaptures();
482 9 needsSubstantiation = true;
483 }
484 }
485
486 36103 return true;
487 161271 }
488
489 /**
490 * Substantiates the candidate return type, based on the given type mapping
491 *
492 * @param candidate Matching candidate function
493 * @param typeMapping Concrete template type mapping
494 * @param callNode AST node for error messages
495 */
496 36101 void FunctionManager::substantiateReturnType(Function &candidate, const TypeMapping &typeMapping, const ASTNode *callNode) {
497
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 36101 if (candidate.returnType.hasAnyGenericParts())
498 3540 TypeMatcher::substantiateTypeWithTypeMapping(candidate.returnType, typeMapping, callNode);
499 36101 }
500
501 /**
502 * Searches the candidate template types for a generic type object with a certain name and return it
503 *
504 * @param candidate Matching candidate function
505 * @param templateTypeName Template type name
506 * @return Generic type object
507 */
508 24381 const GenericType *FunctionManager::getGenericTypeOfCandidateByName(const Function &candidate,
509 const std::string &templateTypeName) {
510
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 51879 for (const GenericType &templateType : candidate.templateTypes) {
511
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 27498 if (templateType.getSubType() == templateTypeName)
512 24381 return &templateType;
513 }
514 ✗ return nullptr;
515 }
516
517 /**
518 * Narrow a multi-match overload set by preferring the candidate whose parameter qualifiers most closely match
519 * the argument qualifiers. This resolves the typical copy-vs-move ctor ambiguity where both a `const T&`
520 * (copy) and a `T&` (move) ctor match a non-const lvalue argument - we prefer the non-const-ref candidate
521 * (move) since it requires no constification. When the argument is const, we prefer the const-ref candidate
522 * (copy) since binding to a non-const ref would require const-loss.
523 *
524 * Modifies `matches` in place, removing any candidate that scores worse than the best one. A no-op if there
525 * are fewer than two candidates.
526 *
527 * @param matches Candidate list to narrow
528 * @param reqArgs Argument list from the call site
529 */
530 27451 void FunctionManager::breakOverloadTie(std::vector<Function *> &matches, const ArgList &reqArgs) {
531
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 27451 if (matches.size() < 2)
532 27444 return;
533
534 7 constexpr int CONSTIFY_PENALTY = 1;
535 7 constexpr int CONST_LOSS_PENALTY = 100;
536 // An exact type match is always preferred over a match that required an implicit upcast (struct to
537 // implemented interface, or struct to composed base struct). This keeps e.g. 'f(Derived)' preferred
538 // over 'f(Base)' when called with a Derived, instead of reporting an ambiguity.
539 7 constexpr int UPCAST_PENALTY = 1000;
540 35 const auto scoreSpecificity = [&](const Function *f) {
541 28 int penalty = 0;
542
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 56 for (size_t i = 0; i < std::min(reqArgs.size(), f->paramList.size()); i++) {
543
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 28 const QualType &paramType = f->paramList.at(i).qualType;
544
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 28 const QualType &argType = reqArgs.at(i).first;
545
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 28 const bool paramIsConst = paramType.removeReferenceWrapper().isConst();
546
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 28 const bool argIsConst = argType.removeReferenceWrapper().isConst();
547
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 28 if (paramIsConst && !argIsConst)
548 8 penalty += CONSTIFY_PENALTY;
549
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 20 else if (!paramIsConst && argIsConst)
550 4 penalty += CONST_LOSS_PENALTY;
551 // Penalize matches that were only possible through an implicit upcast
552 28 QualType paramBase = paramType;
553 28 QualType argBase = argType;
554
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 28 QualType::unwrapBothWithRefWrappers(paramBase, argBase);
555
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 28 if (!paramBase.matches(argBase, true, true, true))
556 ✗ penalty += UPCAST_PENALTY;
557 }
558 28 return penalty;
559 7 };
560
561 7 int bestScore = std::numeric_limits<int>::max();
562
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 28 for (const Function *m : matches)
563
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 14 bestScore = std::min(bestScore, scoreSpecificity(m));
564 7 std::vector<Function *> filtered;
565
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 7 filtered.reserve(matches.size());
566
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 28 for (Function *m : matches)
567
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 14 if (scoreSpecificity(m) == bestScore)
568
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 8 filtered.push_back(m);
569 7 matches = std::move(filtered);
570 7 }
571
572 /**
573 * Calculate the cache key for the function lookup cache
574 *
575 * @param scope Scope to match against
576 * @param name Function name requirement
577 * @param thisType This type requirement
578 * @param args Argument requirement
579 * @param templateTypes Template type requirement
580 * @return Cache key
581 */
582 426571 uint64_t FunctionManager::getCacheKey(const Scope *scope, const std::string &name, const QualType &thisType, const ArgList &args,
583 const QualTypeList &templateTypes) {
584 426571 uint64_t hash = 0;
585 426571 hashCombine64(hash, hashPointer(scope));
586 426571 hashCombine64(hash, std::hash<std::string>{}(name));
587 426571 hashCombine64(hash, std::hash<QualType>{}(thisType));
588
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 2192106 for (const auto &[first, second] : args) {
589 669482 hashCombine64(hash, std::hash<QualType>{}(first));
590 669482 hashCombine64(hash, std::hash<bool>{}(second));
591 }
592 426571 hashCombine64(hash, hashVector(templateTypes));
593 426571 return hash;
594 }
595
596 11024 bool FunctionManager::hasCtor(const Scope *matchScope, CtorKind kind) {
597
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 57130 for (const auto &manifestations : matchScope->functions | std::views::values) {
598
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 101982 for (const auto &function : manifestations | std::views::values) {
599 // If it is no ctor, skip it
600
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 55876 if (function.name != CTOR_FUNCTION_NAME)
601 34670 continue;
602 // Classify the ctor based on its parameter list
603
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 27489 const bool singleSelfRefParam = function.paramList.size() == 1 && function.paramList.at(0).qualType.isRef() &&
604
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 6283 function.paramList.at(0).qualType.getBase() == function.thisType;
605
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 21206 const bool isCopyCtor = singleSelfRefParam && function.paramList.at(0).qualType.isConstRef();
606
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 21206 const bool isMoveCtor = singleSelfRefParam && !function.paramList.at(0).qualType.isConstRef();
607
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 21206 switch (kind) {
608 13169 case CtorKind::COPY:
609
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 13169 if (isCopyCtor)
610 4552 return true;
611 10716 break;
612 4743 case CtorKind::MOVE:
613
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 4743 if (isMoveCtor)
614 4 return true;
615 4739 break;
616 3294 case CtorKind::ANY_NON_COPY_NON_MOVE:
617
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 3294 if (!isCopyCtor && !isMoveCtor)
618 2095 return true;
619 1199 break;
620 }
621 }
622 }
623 6472 return false;
624 }
625
626 2195 bool FunctionManager::hasAnyNonCopyCtor(const Scope *matchScope) { return hasCtor(matchScope, CtorKind::ANY_NON_COPY_NON_MOVE); }
627
628 6660 bool FunctionManager::hasCopyCtor(const Scope *matchScope) { return hasCtor(matchScope, CtorKind::COPY); }
629
630 2165 bool FunctionManager::hasUserCopyCtor(const Scope *matchScope) {
631
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 11957 for (const auto &manifestations : matchScope->functions | std::views::values) {
632
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 20615 for (const auto &function : manifestations | std::views::values) {
633
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 10823 if (function.name != CTOR_FUNCTION_NAME || function.implicitDefault)
634 7578 continue;
635
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 3578 const bool isCopyCtor = function.paramList.size() == 1 && function.paramList.at(0).qualType.isConstRef() &&
636
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 333 function.paramList.at(0).qualType.getBase() == function.thisType;
637
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 3245 if (isCopyCtor)
638 214 return true;
639 }
640 }
641 1951 return false;
642 }
643
644 2169 bool FunctionManager::hasMoveCtor(const Scope *matchScope) { return hasCtor(matchScope, CtorKind::MOVE); }
645
646 13200 Function *FunctionManager::findMoveCtor(Scope *matchScope) {
647
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 137516 for (auto &manifestations : matchScope->functions | std::views::values) {
648
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 285087 for (auto &function : manifestations | std::views::values) {
649
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 160771 if (function.name != CTOR_FUNCTION_NAME)
650 122681 continue;
651
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 65637 const bool isMoveCtor = function.paramList.size() == 1 && function.paramList.at(0).qualType.isRef() &&
652
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 68554 !function.paramList.at(0).qualType.isConstRef() &&
653
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 2917 function.paramList.at(0).qualType.getBase() == function.thisType;
654
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 38090 if (isMoveCtor)
655 47 return &function;
656 }
657 }
658 13153 return nullptr;
659 }
660
661 17104 bool FunctionManager::hasDtor(const Scope *matchScope) {
662
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 141788 for (const auto &manifestations : matchScope->functions | std::views::values)
663
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 275429 for (const auto &function : manifestations | std::views::values)
664
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 150745 if (function.name == DTOR_FUNCTION_NAME)
665 7557 return true;
666 9547 return false;
667 }
668
669 /**
670 * Clear the lookup cache
671 */
672 551 void FunctionManager::cleanup() {
673 551 lookupCache.clear();
674 551 lookupCacheHits = 0;
675 551 lookupCacheMisses = 0;
676 551 }
677
678 /**
679 * Dump usage statistics for the lookup cache
680 */
681 309 std::string FunctionManager::dumpLookupCacheStatistics() {
682
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 309 std::stringstream stats;
683
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 309 stats << "FunctionManager lookup cache statistics:" << std::endl;
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 309 stats << " lookup cache entries: " << lookupCache.size() << std::endl;
685
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 309 stats << " lookup cache hits: " << lookupCacheHits << std::endl;
686
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 309 stats << " lookup cache misses: " << lookupCacheMisses << std::endl;
687
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 618 return stats.str();
688 309 }
689
690 } // namespace spice::compiler
691