1 | #include <algorithm> |
---|
2 | #include "InitTweak.h" |
---|
3 | #include "SynTree/Visitor.h" |
---|
4 | #include "SynTree/Statement.h" |
---|
5 | #include "SynTree/Initializer.h" |
---|
6 | #include "SynTree/Expression.h" |
---|
7 | #include "SynTree/Attribute.h" |
---|
8 | #include "GenPoly/GenPoly.h" |
---|
9 | #include "ResolvExpr/typeops.h" |
---|
10 | |
---|
11 | namespace InitTweak { |
---|
12 | namespace { |
---|
13 | class HasDesignations : public Visitor { |
---|
14 | public: |
---|
15 | bool hasDesignations = false; |
---|
16 | template<typename Init> |
---|
17 | void handleInit( Init * init ) { |
---|
18 | if ( ! init->get_designators().empty() ) hasDesignations = true; |
---|
19 | else Visitor::visit( init ); |
---|
20 | } |
---|
21 | virtual void visit( SingleInit * singleInit ) { handleInit( singleInit); } |
---|
22 | virtual void visit( ListInit * listInit ) { handleInit( listInit); } |
---|
23 | }; |
---|
24 | |
---|
25 | class InitDepthChecker : public Visitor { |
---|
26 | public: |
---|
27 | bool depthOkay = true; |
---|
28 | Type * type; |
---|
29 | int curDepth = 0, maxDepth = 0; |
---|
30 | InitDepthChecker( Type * type ) : type( type ) { |
---|
31 | Type * t = type; |
---|
32 | while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) { |
---|
33 | maxDepth++; |
---|
34 | t = at->get_base(); |
---|
35 | } |
---|
36 | maxDepth++; |
---|
37 | } |
---|
38 | virtual void visit( ListInit * listInit ) { |
---|
39 | curDepth++; |
---|
40 | if ( curDepth > maxDepth ) depthOkay = false; |
---|
41 | Visitor::visit( listInit ); |
---|
42 | curDepth--; |
---|
43 | } |
---|
44 | }; |
---|
45 | |
---|
46 | class InitFlattener : public Visitor { |
---|
47 | public: |
---|
48 | virtual void visit( SingleInit * singleInit ); |
---|
49 | virtual void visit( ListInit * listInit ); |
---|
50 | std::list< Expression * > argList; |
---|
51 | }; |
---|
52 | |
---|
53 | void InitFlattener::visit( SingleInit * singleInit ) { |
---|
54 | argList.push_back( singleInit->get_value()->clone() ); |
---|
55 | } |
---|
56 | |
---|
57 | void InitFlattener::visit( ListInit * listInit ) { |
---|
58 | // flatten nested list inits |
---|
59 | std::list<Initializer*>::iterator it = listInit->begin(); |
---|
60 | for ( ; it != listInit->end(); ++it ) { |
---|
61 | (*it)->accept( *this ); |
---|
62 | } |
---|
63 | } |
---|
64 | } |
---|
65 | |
---|
66 | std::list< Expression * > makeInitList( Initializer * init ) { |
---|
67 | InitFlattener flattener; |
---|
68 | maybeAccept( init, flattener ); |
---|
69 | return flattener.argList; |
---|
70 | } |
---|
71 | |
---|
72 | bool isDesignated( Initializer * init ) { |
---|
73 | HasDesignations finder; |
---|
74 | maybeAccept( init, finder ); |
---|
75 | return finder.hasDesignations; |
---|
76 | } |
---|
77 | |
---|
78 | bool checkInitDepth( ObjectDecl * objDecl ) { |
---|
79 | InitDepthChecker checker( objDecl->get_type() ); |
---|
80 | maybeAccept( objDecl->get_init(), checker ); |
---|
81 | return checker.depthOkay; |
---|
82 | } |
---|
83 | |
---|
84 | class InitExpander::ExpanderImpl { |
---|
85 | public: |
---|
86 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0; |
---|
87 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0; |
---|
88 | }; |
---|
89 | |
---|
90 | class InitImpl : public InitExpander::ExpanderImpl { |
---|
91 | public: |
---|
92 | InitImpl( Initializer * init ) : init( init ) {} |
---|
93 | |
---|
94 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
---|
95 | // this is wrong, but just a placeholder for now |
---|
96 | // if ( ! flattened ) flatten( indices ); |
---|
97 | // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >(); |
---|
98 | return makeInitList( init ); |
---|
99 | } |
---|
100 | |
---|
101 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ); |
---|
102 | private: |
---|
103 | Initializer * init; |
---|
104 | }; |
---|
105 | |
---|
106 | class ExprImpl : public InitExpander::ExpanderImpl { |
---|
107 | public: |
---|
108 | ExprImpl( Expression * expr ) : arg( expr ) {} |
---|
109 | |
---|
110 | ~ExprImpl() { delete arg; } |
---|
111 | |
---|
112 | virtual std::list< Expression * > next( std::list< Expression * > & indices ) { |
---|
113 | std::list< Expression * > ret; |
---|
114 | Expression * expr = maybeClone( arg ); |
---|
115 | if ( expr ) { |
---|
116 | for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) { |
---|
117 | // go through indices and layer on subscript exprs ?[?] |
---|
118 | ++it; |
---|
119 | UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") ); |
---|
120 | subscriptExpr->get_args().push_back( expr ); |
---|
121 | subscriptExpr->get_args().push_back( (*it)->clone() ); |
---|
122 | expr = subscriptExpr; |
---|
123 | } |
---|
124 | ret.push_back( expr ); |
---|
125 | } |
---|
126 | return ret; |
---|
127 | } |
---|
128 | |
---|
129 | virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ); |
---|
130 | private: |
---|
131 | Expression * arg; |
---|
132 | }; |
---|
133 | |
---|
134 | InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {} |
---|
135 | |
---|
136 | InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {} |
---|
137 | |
---|
138 | std::list< Expression * > InitExpander::operator*() { |
---|
139 | return cur; |
---|
140 | } |
---|
141 | |
---|
142 | InitExpander & InitExpander::operator++() { |
---|
143 | cur = expander->next( indices ); |
---|
144 | return *this; |
---|
145 | } |
---|
146 | |
---|
147 | // use array indices list to build switch statement |
---|
148 | void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) { |
---|
149 | indices.push_back( index ); |
---|
150 | indices.push_back( dimension ); |
---|
151 | } |
---|
152 | |
---|
153 | void InitExpander::clearArrayIndices() { |
---|
154 | deleteAll( indices ); |
---|
155 | indices.clear(); |
---|
156 | } |
---|
157 | |
---|
158 | namespace { |
---|
159 | /// given index i, dimension d, initializer init, and callExpr f, generates |
---|
160 | /// if (i < d) f(..., init) |
---|
161 | /// ++i; |
---|
162 | /// so that only elements within the range of the array are constructed |
---|
163 | template< typename OutIterator > |
---|
164 | void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) { |
---|
165 | UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") ); |
---|
166 | cond->get_args().push_back( index->clone() ); |
---|
167 | cond->get_args().push_back( dimension->clone() ); |
---|
168 | |
---|
169 | std::list< Expression * > args = makeInitList( init ); |
---|
170 | callExpr->get_args().splice( callExpr->get_args().end(), args ); |
---|
171 | |
---|
172 | *out++ = new IfStmt( noLabels, cond, new ExprStmt( noLabels, callExpr ), NULL ); |
---|
173 | |
---|
174 | UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) ); |
---|
175 | increment->get_args().push_back( new AddressExpr( index->clone() ) ); |
---|
176 | *out++ = new ExprStmt( noLabels, increment ); |
---|
177 | } |
---|
178 | |
---|
179 | template< typename OutIterator > |
---|
180 | void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) { |
---|
181 | if ( idx == idxEnd ) return; |
---|
182 | Expression * index = *idx++; |
---|
183 | assert( idx != idxEnd ); |
---|
184 | Expression * dimension = *idx++; |
---|
185 | |
---|
186 | // xxx - may want to eventually issue a warning here if we can detect |
---|
187 | // that the number of elements exceeds to dimension of the array |
---|
188 | if ( idx == idxEnd ) { |
---|
189 | if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) { |
---|
190 | for ( Initializer * init : *listInit ) { |
---|
191 | buildCallExpr( callExpr->clone(), index, dimension, init, out ); |
---|
192 | } |
---|
193 | } else { |
---|
194 | buildCallExpr( callExpr->clone(), index, dimension, init, out ); |
---|
195 | } |
---|
196 | } else { |
---|
197 | std::list< Statement * > branches; |
---|
198 | |
---|
199 | unsigned long cond = 0; |
---|
200 | ListInit * listInit = dynamic_cast< ListInit * >( init ); |
---|
201 | if ( ! listInit ) { |
---|
202 | // xxx - this shouldn't be an error, but need a way to |
---|
203 | // terminate without creating output, so should catch this error |
---|
204 | throw SemanticError( "unbalanced list initializers" ); |
---|
205 | } |
---|
206 | |
---|
207 | static UniqueName targetLabel( "L__autogen__" ); |
---|
208 | Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } ); |
---|
209 | for ( Initializer * init : *listInit ) { |
---|
210 | Expression * condition; |
---|
211 | // check for designations |
---|
212 | // if ( init-> ) { |
---|
213 | condition = new ConstantExpr( Constant::from_ulong( cond ) ); |
---|
214 | ++cond; |
---|
215 | // } else { |
---|
216 | // condition = // ... take designation |
---|
217 | // cond = // ... take designation+1 |
---|
218 | // } |
---|
219 | std::list< Statement * > stmts; |
---|
220 | build( callExpr, idx, idxEnd, init, back_inserter( stmts ) ); |
---|
221 | stmts.push_back( new BranchStmt( noLabels, switchLabel, BranchStmt::Break ) ); |
---|
222 | CaseStmt * caseStmt = new CaseStmt( noLabels, condition, stmts ); |
---|
223 | branches.push_back( caseStmt ); |
---|
224 | } |
---|
225 | *out++ = new SwitchStmt( noLabels, index->clone(), branches ); |
---|
226 | *out++ = new NullStmt( std::list<Label>{ switchLabel } ); |
---|
227 | } |
---|
228 | } |
---|
229 | } |
---|
230 | |
---|
231 | // if array came with an initializer list: initialize each element |
---|
232 | // may have more initializers than elements in the array - need to check at each index that |
---|
233 | // we haven't exceeded size. |
---|
234 | // may have fewer initializers than elements in the array - need to default construct |
---|
235 | // remaining elements. |
---|
236 | // To accomplish this, generate switch statement, consuming all of expander's elements |
---|
237 | Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) { |
---|
238 | if ( ! init ) return NULL; |
---|
239 | CompoundStmt * block = new CompoundStmt( noLabels ); |
---|
240 | build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) ); |
---|
241 | if ( block->get_kids().empty() ) { |
---|
242 | delete block; |
---|
243 | return NULL; |
---|
244 | } else { |
---|
245 | init = NULL; // init was consumed in creating the list init |
---|
246 | return block; |
---|
247 | } |
---|
248 | } |
---|
249 | |
---|
250 | Statement * ExprImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) { |
---|
251 | return NULL; |
---|
252 | } |
---|
253 | |
---|
254 | Statement * InitExpander::buildListInit( UntypedExpr * dst ) { |
---|
255 | return expander->buildListInit( dst, indices ); |
---|
256 | } |
---|
257 | |
---|
258 | bool tryConstruct( ObjectDecl * objDecl ) { |
---|
259 | return ! LinkageSpec::isBuiltin( objDecl->get_linkage() ) && |
---|
260 | (objDecl->get_init() == NULL || |
---|
261 | ( objDecl->get_init() != NULL && objDecl->get_init()->get_maybeConstructed() )) |
---|
262 | && objDecl->get_storageClass() != DeclarationNode::Extern; |
---|
263 | } |
---|
264 | |
---|
265 | class CallFinder : public Visitor { |
---|
266 | public: |
---|
267 | typedef Visitor Parent; |
---|
268 | CallFinder( const std::list< std::string > & names ) : names( names ) {} |
---|
269 | |
---|
270 | virtual void visit( ApplicationExpr * appExpr ) { |
---|
271 | handleCallExpr( appExpr ); |
---|
272 | } |
---|
273 | |
---|
274 | virtual void visit( UntypedExpr * untypedExpr ) { |
---|
275 | handleCallExpr( untypedExpr ); |
---|
276 | } |
---|
277 | |
---|
278 | std::list< Expression * > * matches; |
---|
279 | private: |
---|
280 | const std::list< std::string > names; |
---|
281 | |
---|
282 | template< typename CallExpr > |
---|
283 | void handleCallExpr( CallExpr * expr ) { |
---|
284 | Parent::visit( expr ); |
---|
285 | std::string fname = getFunctionName( expr ); |
---|
286 | if ( std::find( names.begin(), names.end(), fname ) != names.end() ) { |
---|
287 | matches->push_back( expr ); |
---|
288 | } |
---|
289 | } |
---|
290 | }; |
---|
291 | |
---|
292 | void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) { |
---|
293 | static CallFinder finder( std::list< std::string >{ "?{}", "^?{}" } ); |
---|
294 | finder.matches = &matches; |
---|
295 | maybeAccept( stmt, finder ); |
---|
296 | } |
---|
297 | |
---|
298 | Expression * getCtorDtorCall( Statement * stmt ) { |
---|
299 | std::list< Expression * > matches; |
---|
300 | collectCtorDtorCalls( stmt, matches ); |
---|
301 | assert( matches.size() <= 1 ); |
---|
302 | return matches.size() == 1 ? matches.front() : NULL; |
---|
303 | } |
---|
304 | |
---|
305 | namespace { |
---|
306 | DeclarationWithType * getCalledFunction( Expression * expr ); |
---|
307 | |
---|
308 | template<typename CallExpr> |
---|
309 | DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) { |
---|
310 | // (*f)(x) => should get "f" |
---|
311 | std::string name = getFunctionName( expr ); |
---|
312 | assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() ); |
---|
313 | assertf( ! expr->get_args().empty(), "Can't get called function from dereference with no arguments" ); |
---|
314 | return getCalledFunction( expr->get_args().front() ); |
---|
315 | } |
---|
316 | |
---|
317 | DeclarationWithType * getCalledFunction( Expression * expr ) { |
---|
318 | assert( expr ); |
---|
319 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
320 | return varExpr->get_var(); |
---|
321 | } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
322 | return memberExpr->get_member(); |
---|
323 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
324 | return getCalledFunction( castExpr->get_arg() ); |
---|
325 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) { |
---|
326 | return handleDerefCalledFunction( untypedExpr ); |
---|
327 | } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) { |
---|
328 | return handleDerefCalledFunction( appExpr ); |
---|
329 | } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) { |
---|
330 | return getCalledFunction( addrExpr->get_arg() ); |
---|
331 | } |
---|
332 | return nullptr; |
---|
333 | } |
---|
334 | } |
---|
335 | |
---|
336 | ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) { |
---|
337 | ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ); |
---|
338 | if ( ! appExpr ) return NULL; |
---|
339 | DeclarationWithType * function = getCalledFunction( appExpr->get_function() ); |
---|
340 | assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() ); |
---|
341 | // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor |
---|
342 | // will call all member dtors, and some members may have a user defined dtor. |
---|
343 | return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : NULL; |
---|
344 | } |
---|
345 | |
---|
346 | namespace { |
---|
347 | template <typename Predicate> |
---|
348 | bool allofCtorDtor( Statement * stmt, const Predicate & pred ) { |
---|
349 | std::list< Expression * > callExprs; |
---|
350 | collectCtorDtorCalls( stmt, callExprs ); |
---|
351 | // if ( callExprs.empty() ) return false; // xxx - do I still need this check? |
---|
352 | return std::all_of( callExprs.begin(), callExprs.end(), pred); |
---|
353 | } |
---|
354 | } |
---|
355 | |
---|
356 | bool isIntrinsicSingleArgCallStmt( Statement * stmt ) { |
---|
357 | return allofCtorDtor( stmt, []( Expression * callExpr ){ |
---|
358 | if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) { |
---|
359 | FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_result() ); |
---|
360 | assert( funcType ); |
---|
361 | return funcType->get_parameters().size() == 1; |
---|
362 | } |
---|
363 | return false; |
---|
364 | }); |
---|
365 | } |
---|
366 | |
---|
367 | bool isIntrinsicCallStmt( Statement * stmt ) { |
---|
368 | return allofCtorDtor( stmt, []( Expression * callExpr ) { |
---|
369 | return isIntrinsicCallExpr( callExpr ); |
---|
370 | }); |
---|
371 | } |
---|
372 | |
---|
373 | namespace { |
---|
374 | template<typename CallExpr> |
---|
375 | Expression *& callArg( CallExpr * callExpr, unsigned int pos ) { |
---|
376 | if ( pos >= callExpr->get_args().size() ) assertf( false, "asking for argument that doesn't exist. Return NULL/throw exception?" ); |
---|
377 | for ( Expression *& arg : callExpr->get_args() ) { |
---|
378 | if ( pos == 0 ) return arg; |
---|
379 | pos--; |
---|
380 | } |
---|
381 | assert( false ); |
---|
382 | } |
---|
383 | } |
---|
384 | |
---|
385 | Expression *& getCallArg( Expression * callExpr, unsigned int pos ) { |
---|
386 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) { |
---|
387 | return callArg( appExpr, pos ); |
---|
388 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) { |
---|
389 | return callArg( untypedExpr, pos ); |
---|
390 | } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) { |
---|
391 | std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids(); |
---|
392 | assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." ); |
---|
393 | ExprStmt * stmt = safe_dynamic_cast< ExprStmt * >( stmts.back() ); |
---|
394 | TupleExpr * tuple = safe_dynamic_cast< TupleExpr * >( stmt->get_expr() ); |
---|
395 | assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." ); |
---|
396 | return getCallArg( tuple->get_exprs().front(), pos ); |
---|
397 | } else { |
---|
398 | assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() ); |
---|
399 | } |
---|
400 | } |
---|
401 | |
---|
402 | namespace { |
---|
403 | std::string funcName( Expression * func ); |
---|
404 | |
---|
405 | template<typename CallExpr> |
---|
406 | std::string handleDerefName( CallExpr * expr ) { |
---|
407 | // (*f)(x) => should get name "f" |
---|
408 | std::string name = getFunctionName( expr ); |
---|
409 | assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() ); |
---|
410 | assertf( ! expr->get_args().empty(), "Can't get function name from dereference with no arguments" ); |
---|
411 | return funcName( expr->get_args().front() ); |
---|
412 | } |
---|
413 | |
---|
414 | std::string funcName( Expression * func ) { |
---|
415 | if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) { |
---|
416 | return nameExpr->get_name(); |
---|
417 | } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) { |
---|
418 | return varExpr->get_var()->get_name(); |
---|
419 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) { |
---|
420 | return funcName( castExpr->get_arg() ); |
---|
421 | } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) { |
---|
422 | return memberExpr->get_member()->get_name(); |
---|
423 | } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) { |
---|
424 | return funcName( memberExpr->get_member() ); |
---|
425 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) { |
---|
426 | return handleDerefName( untypedExpr ); |
---|
427 | } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) { |
---|
428 | return handleDerefName( appExpr ); |
---|
429 | } else { |
---|
430 | assertf( false, "Unexpected expression type being called as a function in call expression" ); |
---|
431 | } |
---|
432 | } |
---|
433 | } |
---|
434 | |
---|
435 | std::string getFunctionName( Expression * expr ) { |
---|
436 | // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and |
---|
437 | // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction |
---|
438 | // can't possibly do anything reasonable. |
---|
439 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) { |
---|
440 | return funcName( appExpr->get_function() ); |
---|
441 | } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) { |
---|
442 | return funcName( untypedExpr->get_function() ); |
---|
443 | } else { |
---|
444 | std::cerr << expr << std::endl; |
---|
445 | assertf( false, "Unexpected expression type passed to getFunctionName" ); |
---|
446 | } |
---|
447 | } |
---|
448 | |
---|
449 | Type * getPointerBase( Type * type ) { |
---|
450 | if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) { |
---|
451 | return ptrType->get_base(); |
---|
452 | } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
---|
453 | return arrayType->get_base(); |
---|
454 | } else { |
---|
455 | return NULL; |
---|
456 | } |
---|
457 | } |
---|
458 | |
---|
459 | Type * isPointerType( Type * type ) { |
---|
460 | if ( getPointerBase( type ) ) return type; |
---|
461 | else return NULL; |
---|
462 | } |
---|
463 | |
---|
464 | class ConstExprChecker : public Visitor { |
---|
465 | public: |
---|
466 | ConstExprChecker() : isConstExpr( true ) {} |
---|
467 | |
---|
468 | virtual void visit( ApplicationExpr *applicationExpr ) { isConstExpr = false; } |
---|
469 | virtual void visit( UntypedExpr *untypedExpr ) { isConstExpr = false; } |
---|
470 | virtual void visit( NameExpr *nameExpr ) { |
---|
471 | // xxx - temporary hack, because 0 and 1 really should be constexprs, even though they technically aren't in Cforall today |
---|
472 | if ( nameExpr->get_name() != "0" && nameExpr->get_name() != "1" ) isConstExpr = false; |
---|
473 | } |
---|
474 | // virtual void visit( CastExpr *castExpr ) { isConstExpr = false; } |
---|
475 | virtual void visit( AddressExpr *addressExpr ) { |
---|
476 | // address of a variable or member expression is constexpr |
---|
477 | Expression * arg = addressExpr->get_arg(); |
---|
478 | if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false; |
---|
479 | } |
---|
480 | virtual void visit( LabelAddressExpr *labAddressExpr ) { isConstExpr = false; } |
---|
481 | virtual void visit( UntypedMemberExpr *memberExpr ) { isConstExpr = false; } |
---|
482 | virtual void visit( MemberExpr *memberExpr ) { isConstExpr = false; } |
---|
483 | virtual void visit( VariableExpr *variableExpr ) { isConstExpr = false; } |
---|
484 | // these might be okay? |
---|
485 | // virtual void visit( SizeofExpr *sizeofExpr ); |
---|
486 | // virtual void visit( AlignofExpr *alignofExpr ); |
---|
487 | // virtual void visit( UntypedOffsetofExpr *offsetofExpr ); |
---|
488 | // virtual void visit( OffsetofExpr *offsetofExpr ); |
---|
489 | // virtual void visit( OffsetPackExpr *offsetPackExpr ); |
---|
490 | // virtual void visit( AttrExpr *attrExpr ); |
---|
491 | // virtual void visit( CommaExpr *commaExpr ); |
---|
492 | // virtual void visit( LogicalExpr *logicalExpr ); |
---|
493 | // virtual void visit( ConditionalExpr *conditionalExpr ); |
---|
494 | virtual void visit( TypeExpr *typeExpr ) { isConstExpr = false; } |
---|
495 | virtual void visit( AsmExpr *asmExpr ) { isConstExpr = false; } |
---|
496 | virtual void visit( UntypedValofExpr *valofExpr ) { isConstExpr = false; } |
---|
497 | virtual void visit( CompoundLiteralExpr *compLitExpr ) { isConstExpr = false; } |
---|
498 | virtual void visit( UntypedTupleExpr *tupleExpr ) { isConstExpr = false; } |
---|
499 | virtual void visit( TupleExpr *tupleExpr ) { isConstExpr = false; } |
---|
500 | virtual void visit( TupleAssignExpr *tupleExpr ) { isConstExpr = false; } |
---|
501 | |
---|
502 | bool isConstExpr; |
---|
503 | }; |
---|
504 | |
---|
505 | bool isConstExpr( Expression * expr ) { |
---|
506 | if ( expr ) { |
---|
507 | ConstExprChecker checker; |
---|
508 | expr->accept( checker ); |
---|
509 | return checker.isConstExpr; |
---|
510 | } |
---|
511 | return true; |
---|
512 | } |
---|
513 | |
---|
514 | bool isConstExpr( Initializer * init ) { |
---|
515 | if ( init ) { |
---|
516 | ConstExprChecker checker; |
---|
517 | init->accept( checker ); |
---|
518 | return checker.isConstExpr; |
---|
519 | } // if |
---|
520 | // for all intents and purposes, no initializer means const expr |
---|
521 | return true; |
---|
522 | } |
---|
523 | |
---|
524 | bool isConstructor( const std::string & str ) { return str == "?{}"; } |
---|
525 | bool isDestructor( const std::string & str ) { return str == "^?{}"; } |
---|
526 | bool isAssignment( const std::string & str ) { return str == "?=?"; } |
---|
527 | bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); } |
---|
528 | bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); } |
---|
529 | |
---|
530 | FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) { |
---|
531 | FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl ); |
---|
532 | if ( ! function ) return 0; |
---|
533 | if ( function->get_name() != fname ) return 0; |
---|
534 | FunctionType * ftype = function->get_functionType(); |
---|
535 | if ( ftype->get_parameters().size() != 2 ) return 0; |
---|
536 | |
---|
537 | Type * t1 = ftype->get_parameters().front()->get_type(); |
---|
538 | Type * t2 = ftype->get_parameters().back()->get_type(); |
---|
539 | PointerType * ptrType = dynamic_cast< PointerType * > ( t1 ); |
---|
540 | assert( ptrType ); |
---|
541 | |
---|
542 | if ( ResolvExpr::typesCompatibleIgnoreQualifiers( ptrType->get_base(), t2, SymTab::Indexer() ) ) { |
---|
543 | return function; |
---|
544 | } else { |
---|
545 | return nullptr; |
---|
546 | } |
---|
547 | } |
---|
548 | |
---|
549 | FunctionDecl * isAssignment( Declaration * decl ) { |
---|
550 | return isCopyFunction( decl, "?=?" ); |
---|
551 | } |
---|
552 | FunctionDecl * isDestructor( Declaration * decl ) { |
---|
553 | if ( isDestructor( decl->get_name() ) ) { |
---|
554 | return dynamic_cast< FunctionDecl * >( decl ); |
---|
555 | } |
---|
556 | return nullptr; |
---|
557 | } |
---|
558 | FunctionDecl * isDefaultConstructor( Declaration * decl ) { |
---|
559 | if ( isConstructor( decl->get_name() ) ) { |
---|
560 | if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) { |
---|
561 | if ( func->get_functionType()->get_parameters().size() == 1 ) { |
---|
562 | return func; |
---|
563 | } |
---|
564 | } |
---|
565 | } |
---|
566 | return nullptr; |
---|
567 | } |
---|
568 | FunctionDecl * isCopyConstructor( Declaration * decl ) { |
---|
569 | return isCopyFunction( decl, "?{}" ); |
---|
570 | } |
---|
571 | } |
---|