source: src/InitTweak/InitTweak.cc@ acdfb45

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since acdfb45 was e3e16bc, checked in by Thierry Delisle <tdelisle@…>, 8 years ago

Renamed safe_dynamic_cast to strict_dynamic_cast
  • Property mode set to 100644
File size: 22.6 KB
RevLine 
[d180746]1#include <stddef.h> // for NULL
2#include <algorithm> // for find, all_of
[e3e16bc]3#include <cassert> // for assertf, assert, strict_dynamic_cast
[d180746]4#include <iostream> // for ostream, cerr, endl
5#include <iterator> // for back_insert_iterator, back_inserter
6#include <memory> // for __shared_ptr
7
8#include "Common/SemanticError.h" // for SemanticError
9#include "Common/UniqueName.h" // for UniqueName
10#include "Common/utility.h" // for toString, deleteAll, maybeClone
11#include "GenPoly/GenPoly.h" // for getFunctionType
[2b46a13]12#include "InitTweak.h"
[d180746]13#include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic
14#include "ResolvExpr/typeops.h" // for typesCompatibleIgnoreQualifiers
15#include "SymTab/Indexer.h" // for Indexer
16#include "SynTree/Attribute.h" // for Attribute
17#include "SynTree/Constant.h" // for Constant
18#include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType
19#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applicati...
20#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
21#include "SynTree/Label.h" // for Label, noLabels
22#include "SynTree/Statement.h" // for CompoundStmt, ExprStmt, BranchStmt
23#include "SynTree/Type.h" // for FunctionType, ArrayType, PointerType
24#include "SynTree/Visitor.h" // for Visitor, maybeAccept
25
26class UntypedValofExpr;
[2b46a13]27
28namespace InitTweak {
[64071c2]29 namespace {
30 class HasDesignations : public Visitor {
31 public:
32 bool hasDesignations = false;
[e4d829b]33 virtual void visit( Designation * des ) {
34 if ( ! des->get_designators().empty() ) hasDesignations = true;
35 else Visitor::visit( des );
[64071c2]36 }
37 };
[2b46a13]38
[dcd73d1]39 class InitDepthChecker : public Visitor {
40 public:
41 bool depthOkay = true;
42 Type * type;
43 int curDepth = 0, maxDepth = 0;
44 InitDepthChecker( Type * type ) : type( type ) {
45 Type * t = type;
46 while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) {
47 maxDepth++;
48 t = at->get_base();
49 }
50 maxDepth++;
51 }
52 virtual void visit( ListInit * listInit ) {
53 curDepth++;
54 if ( curDepth > maxDepth ) depthOkay = false;
55 Visitor::visit( listInit );
56 curDepth--;
57 }
58 };
59
[4d2434a]60 class InitFlattener : public Visitor {
[64071c2]61 public:
62 virtual void visit( SingleInit * singleInit );
63 virtual void visit( ListInit * listInit );
64 std::list< Expression * > argList;
65 };
[2b46a13]66
[4d2434a]67 void InitFlattener::visit( SingleInit * singleInit ) {
[64071c2]68 argList.push_back( singleInit->get_value()->clone() );
69 }
[2b46a13]70
[4d2434a]71 void InitFlattener::visit( ListInit * listInit ) {
72 // flatten nested list inits
73 std::list<Initializer*>::iterator it = listInit->begin();
74 for ( ; it != listInit->end(); ++it ) {
[64071c2]75 (*it)->accept( *this );
76 }
77 }
78 }
[2b46a13]79
[64071c2]80 std::list< Expression * > makeInitList( Initializer * init ) {
[4d2434a]81 InitFlattener flattener;
82 maybeAccept( init, flattener );
83 return flattener.argList;
[64071c2]84 }
[2b46a13]85
[64071c2]86 bool isDesignated( Initializer * init ) {
87 HasDesignations finder;
88 maybeAccept( init, finder );
89 return finder.hasDesignations;
[dcd73d1]90 }
91
92 bool checkInitDepth( ObjectDecl * objDecl ) {
93 InitDepthChecker checker( objDecl->get_type() );
94 maybeAccept( objDecl->get_init(), checker );
95 return checker.depthOkay;
[64071c2]96 }
[2b46a13]97
[39f84a4]98 class InitExpander::ExpanderImpl {
99 public:
100 virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;
[4d2434a]101 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;
[39f84a4]102 };
103
104 class InitImpl : public InitExpander::ExpanderImpl {
105 public:
[4d2434a]106 InitImpl( Initializer * init ) : init( init ) {}
[39f84a4]107
[7e003011]108 virtual std::list< Expression * > next( __attribute((unused)) std::list< Expression * > & indices ) {
[39f84a4]109 // this is wrong, but just a placeholder for now
[4d2434a]110 // if ( ! flattened ) flatten( indices );
111 // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >();
112 return makeInitList( init );
[39f84a4]113 }
[4d2434a]114
115 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
[39f84a4]116 private:
[4d2434a]117 Initializer * init;
[39f84a4]118 };
119
120 class ExprImpl : public InitExpander::ExpanderImpl {
121 public:
122 ExprImpl( Expression * expr ) : arg( expr ) {}
123
[9b4c936]124 ~ExprImpl() { delete arg; }
125
[39f84a4]126 virtual std::list< Expression * > next( std::list< Expression * > & indices ) {
127 std::list< Expression * > ret;
128 Expression * expr = maybeClone( arg );
129 if ( expr ) {
130 for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) {
131 // go through indices and layer on subscript exprs ?[?]
132 ++it;
133 UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") );
134 subscriptExpr->get_args().push_back( expr );
135 subscriptExpr->get_args().push_back( (*it)->clone() );
136 expr = subscriptExpr;
137 }
138 ret.push_back( expr );
139 }
140 return ret;
141 }
[4d2434a]142
143 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
[39f84a4]144 private:
145 Expression * arg;
146 };
147
148 InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {}
149
150 InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {}
151
152 std::list< Expression * > InitExpander::operator*() {
153 return cur;
154 }
155
156 InitExpander & InitExpander::operator++() {
157 cur = expander->next( indices );
158 return *this;
159 }
160
161 // use array indices list to build switch statement
162 void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) {
163 indices.push_back( index );
164 indices.push_back( dimension );
165 }
166
[4d2434a]167 void InitExpander::clearArrayIndices() {
[9b4c936]168 deleteAll( indices );
[4d2434a]169 indices.clear();
170 }
171
172 namespace {
[f9cebb5]173 /// given index i, dimension d, initializer init, and callExpr f, generates
174 /// if (i < d) f(..., init)
175 /// ++i;
176 /// so that only elements within the range of the array are constructed
[4d2434a]177 template< typename OutIterator >
[f9cebb5]178 void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) {
[4d2434a]179 UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") );
180 cond->get_args().push_back( index->clone() );
181 cond->get_args().push_back( dimension->clone() );
182
183 std::list< Expression * > args = makeInitList( init );
184 callExpr->get_args().splice( callExpr->get_args().end(), args );
185
186 *out++ = new IfStmt( noLabels, cond, new ExprStmt( noLabels, callExpr ), NULL );
187
188 UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) );
[175ad32b]189 increment->get_args().push_back( index->clone() );
[4d2434a]190 *out++ = new ExprStmt( noLabels, increment );
191 }
192
193 template< typename OutIterator >
194 void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) {
195 if ( idx == idxEnd ) return;
196 Expression * index = *idx++;
197 assert( idx != idxEnd );
198 Expression * dimension = *idx++;
199
[f9cebb5]200 // xxx - may want to eventually issue a warning here if we can detect
201 // that the number of elements exceeds to dimension of the array
[4d2434a]202 if ( idx == idxEnd ) {
203 if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) {
204 for ( Initializer * init : *listInit ) {
[f9cebb5]205 buildCallExpr( callExpr->clone(), index, dimension, init, out );
[4d2434a]206 }
207 } else {
[f9cebb5]208 buildCallExpr( callExpr->clone(), index, dimension, init, out );
[4d2434a]209 }
210 } else {
211 std::list< Statement * > branches;
212
213 unsigned long cond = 0;
214 ListInit * listInit = dynamic_cast< ListInit * >( init );
215 if ( ! listInit ) {
216 // xxx - this shouldn't be an error, but need a way to
217 // terminate without creating output, so should catch this error
218 throw SemanticError( "unbalanced list initializers" );
219 }
[f9cebb5]220
221 static UniqueName targetLabel( "L__autogen__" );
222 Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } );
[4d2434a]223 for ( Initializer * init : *listInit ) {
224 Expression * condition;
225 // check for designations
226 // if ( init-> ) {
227 condition = new ConstantExpr( Constant::from_ulong( cond ) );
228 ++cond;
229 // } else {
230 // condition = // ... take designation
231 // cond = // ... take designation+1
232 // }
233 std::list< Statement * > stmts;
234 build( callExpr, idx, idxEnd, init, back_inserter( stmts ) );
[f9cebb5]235 stmts.push_back( new BranchStmt( noLabels, switchLabel, BranchStmt::Break ) );
[4d2434a]236 CaseStmt * caseStmt = new CaseStmt( noLabels, condition, stmts );
237 branches.push_back( caseStmt );
238 }
239 *out++ = new SwitchStmt( noLabels, index->clone(), branches );
[f9cebb5]240 *out++ = new NullStmt( std::list<Label>{ switchLabel } );
[4d2434a]241 }
242 }
243 }
244
245 // if array came with an initializer list: initialize each element
246 // may have more initializers than elements in the array - need to check at each index that
247 // we haven't exceeded size.
248 // may have fewer initializers than elements in the array - need to default construct
249 // remaining elements.
250 // To accomplish this, generate switch statement, consuming all of expander's elements
251 Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) {
252 if ( ! init ) return NULL;
[f9cebb5]253 CompoundStmt * block = new CompoundStmt( noLabels );
254 build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) );
255 if ( block->get_kids().empty() ) {
256 delete block;
[4d2434a]257 return NULL;
258 } else {
259 init = NULL; // init was consumed in creating the list init
[f9cebb5]260 return block;
[4d2434a]261 }
[39f84a4]262 }
263
[7e003011]264 Statement * ExprImpl::buildListInit( __attribute((unused)) UntypedExpr * dst, __attribute((unused)) std::list< Expression * > & indices ) {
[4d2434a]265 return NULL;
266 }
267
268 Statement * InitExpander::buildListInit( UntypedExpr * dst ) {
269 return expander->buildListInit( dst, indices );
270 }
271
[64071c2]272 bool tryConstruct( ObjectDecl * objDecl ) {
273 return ! LinkageSpec::isBuiltin( objDecl->get_linkage() ) &&
274 (objDecl->get_init() == NULL ||
[1ba88a0]275 ( objDecl->get_init() != NULL && objDecl->get_init()->get_maybeConstructed() ))
[08d5507b]276 && ! objDecl->get_storageClasses().is_extern;
[64071c2]277 }
[2b46a13]278
[4d2434a]279 class CallFinder : public Visitor {
280 public:
281 typedef Visitor Parent;
282 CallFinder( const std::list< std::string > & names ) : names( names ) {}
283
284 virtual void visit( ApplicationExpr * appExpr ) {
285 handleCallExpr( appExpr );
286 }
287
288 virtual void visit( UntypedExpr * untypedExpr ) {
289 handleCallExpr( untypedExpr );
290 }
291
292 std::list< Expression * > * matches;
293 private:
294 const std::list< std::string > names;
295
296 template< typename CallExpr >
297 void handleCallExpr( CallExpr * expr ) {
298 Parent::visit( expr );
299 std::string fname = getFunctionName( expr );
300 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {
301 matches->push_back( expr );
[cad355a]302 }
[64071c2]303 }
[4d2434a]304 };
305
306 void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) {
307 static CallFinder finder( std::list< std::string >{ "?{}", "^?{}" } );
308 finder.matches = &matches;
309 maybeAccept( stmt, finder );
[64071c2]310 }
[4d2434a]311
312 Expression * getCtorDtorCall( Statement * stmt ) {
313 std::list< Expression * > matches;
314 collectCtorDtorCalls( stmt, matches );
315 assert( matches.size() <= 1 );
316 return matches.size() == 1 ? matches.front() : NULL;
317 }
318
[aedfd91]319 namespace {
[599b386]320 DeclarationWithType * getCalledFunction( Expression * expr );
321
322 template<typename CallExpr>
323 DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) {
324 // (*f)(x) => should get "f"
325 std::string name = getFunctionName( expr );
326 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
[b128d3e]327 assertf( ! expr->get_args().empty(), "Cannot get called function from dereference with no arguments" );
[599b386]328 return getCalledFunction( expr->get_args().front() );
329 }
330
[ee1635c8]331 DeclarationWithType * getCalledFunction( Expression * expr ) {
332 assert( expr );
333 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
334 return varExpr->get_var();
335 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) {
336 return memberExpr->get_member();
337 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
338 return getCalledFunction( castExpr->get_arg() );
[599b386]339 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) {
340 return handleDerefCalledFunction( untypedExpr );
341 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {
342 return handleDerefCalledFunction( appExpr );
[f3b0a07]343 } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) {
344 return getCalledFunction( addrExpr->get_arg() );
[ee1635c8]345 }
346 return nullptr;
[aedfd91]347 }
348 }
[70f89d00]349
[b7b8674]350 DeclarationWithType * getFunction( Expression * expr ) {
351 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
352 return getCalledFunction( appExpr->get_function() );
353 } else if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * > ( expr ) ) {
354 return getCalledFunction( untyped->get_function() );
355 }
356 assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() );
357 }
358
[aedfd91]359 ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) {
360 ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr );
361 if ( ! appExpr ) return NULL;
[ee1635c8]362 DeclarationWithType * function = getCalledFunction( appExpr->get_function() );
[f3b0a07]363 assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() );
[64071c2]364 // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor
365 // will call all member dtors, and some members may have a user defined dtor.
[ee1635c8]366 return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : NULL;
[aedfd91]367 }
368
[a465caff]369 namespace {
370 template <typename Predicate>
371 bool allofCtorDtor( Statement * stmt, const Predicate & pred ) {
372 std::list< Expression * > callExprs;
373 collectCtorDtorCalls( stmt, callExprs );
374 // if ( callExprs.empty() ) return false; // xxx - do I still need this check?
375 return std::all_of( callExprs.begin(), callExprs.end(), pred);
376 }
377 }
378
[f9cebb5]379 bool isIntrinsicSingleArgCallStmt( Statement * stmt ) {
[a465caff]380 return allofCtorDtor( stmt, []( Expression * callExpr ){
[4d2434a]381 if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {
[906e24d]382 FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_result() );
[4d2434a]383 assert( funcType );
384 return funcType->get_parameters().size() == 1;
385 }
386 return false;
387 });
[64071c2]388 }
[f1b1e4c]389
[a465caff]390 bool isIntrinsicCallStmt( Statement * stmt ) {
391 return allofCtorDtor( stmt, []( Expression * callExpr ) {
392 return isIntrinsicCallExpr( callExpr );
393 });
394 }
395
[64071c2]396 namespace {
397 template<typename CallExpr>
398 Expression *& callArg( CallExpr * callExpr, unsigned int pos ) {
[a61ad31]399 if ( pos >= callExpr->get_args().size() ) assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.", pos, toString( callExpr ).c_str() );
[64071c2]400 for ( Expression *& arg : callExpr->get_args() ) {
401 if ( pos == 0 ) return arg;
402 pos--;
403 }
404 assert( false );
405 }
406 }
[f1b1e4c]407
[64071c2]408 Expression *& getCallArg( Expression * callExpr, unsigned int pos ) {
409 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) {
410 return callArg( appExpr, pos );
411 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) {
412 return callArg( untypedExpr, pos );
[f3b0a07]413 } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) {
414 std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids();
415 assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." );
[e3e16bc]416 ExprStmt * stmt = strict_dynamic_cast< ExprStmt * >( stmts.back() );
417 TupleExpr * tuple = strict_dynamic_cast< TupleExpr * >( stmt->get_expr() );
[f3b0a07]418 assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." );
419 return getCallArg( tuple->get_exprs().front(), pos );
[62a05d1]420 } else if ( ImplicitCopyCtorExpr * copyCtor = dynamic_cast< ImplicitCopyCtorExpr * >( callExpr ) ) {
421 return getCallArg( copyCtor->callExpr, pos );
[64071c2]422 } else {
[f3b0a07]423 assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() );
[64071c2]424 }
425 }
[f1b1e4c]426
[64071c2]427 namespace {
[599b386]428 std::string funcName( Expression * func );
429
430 template<typename CallExpr>
431 std::string handleDerefName( CallExpr * expr ) {
432 // (*f)(x) => should get name "f"
433 std::string name = getFunctionName( expr );
434 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
[b128d3e]435 assertf( ! expr->get_args().empty(), "Cannot get function name from dereference with no arguments" );
[599b386]436 return funcName( expr->get_args().front() );
437 }
438
[c738ca4]439 std::string funcName( Expression * func ) {
[64071c2]440 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) {
441 return nameExpr->get_name();
442 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) {
443 return varExpr->get_var()->get_name();
[c738ca4]444 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) {
445 return funcName( castExpr->get_arg() );
[ee1635c8]446 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) {
447 return memberExpr->get_member()->get_name();
[96a10cdd]448 } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) {
[fd782b2]449 return funcName( memberExpr->get_member() );
[599b386]450 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) {
451 return handleDerefName( untypedExpr );
452 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) {
453 return handleDerefName( appExpr );
[19a9822]454 } else if ( ConstructorExpr * ctorExpr = dynamic_cast< ConstructorExpr * >( func ) ) {
455 return funcName( getCallArg( ctorExpr->get_callExpr(), 0 ) );
[64071c2]456 } else {
[19a9822]457 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );
[64071c2]458 }
459 }
460 }
[70f89d00]461
[64071c2]462 std::string getFunctionName( Expression * expr ) {
[599b386]463 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and
464 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction
465 // can't possibly do anything reasonable.
[64071c2]466 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
[c738ca4]467 return funcName( appExpr->get_function() );
[64071c2]468 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) {
[c738ca4]469 return funcName( untypedExpr->get_function() );
[64071c2]470 } else {
[c738ca4]471 std::cerr << expr << std::endl;
[d1969a6]472 assertf( false, "Unexpected expression type passed to getFunctionName" );
[64071c2]473 }
474 }
[10a7775]475
[64071c2]476 Type * getPointerBase( Type * type ) {
477 if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) {
478 return ptrType->get_base();
479 } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
480 return arrayType->get_base();
[ce8c12f]481 } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {
482 return refType->get_base();
[64071c2]483 } else {
484 return NULL;
485 }
486 }
[10a7775]487
[64071c2]488 Type * isPointerType( Type * type ) {
489 if ( getPointerBase( type ) ) return type;
490 else return NULL;
491 }
[40e636a]492
493 class ConstExprChecker : public Visitor {
494 public:
495 ConstExprChecker() : isConstExpr( true ) {}
496
[65dc863]497 using Visitor::visit;
498
[5809461]499 virtual void visit( ApplicationExpr * ) { isConstExpr = false; }
500 virtual void visit( UntypedExpr * ) { isConstExpr = false; }
501 virtual void visit( NameExpr * ) { isConstExpr = false; }
[1ba88a0]502 // virtual void visit( CastExpr *castExpr ) { isConstExpr = false; }
503 virtual void visit( AddressExpr *addressExpr ) {
504 // address of a variable or member expression is constexpr
505 Expression * arg = addressExpr->get_arg();
506 if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false;
507 }
[5809461]508 virtual void visit( UntypedMemberExpr * ) { isConstExpr = false; }
509 virtual void visit( MemberExpr * ) { isConstExpr = false; }
510 virtual void visit( VariableExpr * ) { isConstExpr = false; }
[40e636a]511 // these might be okay?
512 // virtual void visit( SizeofExpr *sizeofExpr );
513 // virtual void visit( AlignofExpr *alignofExpr );
514 // virtual void visit( UntypedOffsetofExpr *offsetofExpr );
515 // virtual void visit( OffsetofExpr *offsetofExpr );
516 // virtual void visit( OffsetPackExpr *offsetPackExpr );
517 // virtual void visit( AttrExpr *attrExpr );
518 // virtual void visit( CommaExpr *commaExpr );
519 // virtual void visit( LogicalExpr *logicalExpr );
520 // virtual void visit( ConditionalExpr *conditionalExpr );
[5809461]521 virtual void visit( TypeExpr * ) { isConstExpr = false; }
522 virtual void visit( AsmExpr * ) { isConstExpr = false; }
523 virtual void visit( UntypedValofExpr * ) { isConstExpr = false; }
524 virtual void visit( CompoundLiteralExpr * ) { isConstExpr = false; }
525 virtual void visit( UntypedTupleExpr * ) { isConstExpr = false; }
526 virtual void visit( TupleExpr * ) { isConstExpr = false; }
527 virtual void visit( TupleAssignExpr * ) { isConstExpr = false; }
[40e636a]528
529 bool isConstExpr;
530 };
531
532 bool isConstExpr( Expression * expr ) {
533 if ( expr ) {
534 ConstExprChecker checker;
535 expr->accept( checker );
536 return checker.isConstExpr;
537 }
538 return true;
539 }
540
541 bool isConstExpr( Initializer * init ) {
542 if ( init ) {
543 ConstExprChecker checker;
544 init->accept( checker );
545 return checker.isConstExpr;
546 } // if
547 // for all intents and purposes, no initializer means const expr
548 return true;
549 }
550
[79970ed]551 bool isConstructor( const std::string & str ) { return str == "?{}"; }
552 bool isDestructor( const std::string & str ) { return str == "^?{}"; }
[ee1635c8]553 bool isAssignment( const std::string & str ) { return str == "?=?"; }
[79970ed]554 bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); }
[ee1635c8]555 bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); }
[4d4882a]556
[ee1635c8]557 FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) {
[4d4882a]558 FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl );
559 if ( ! function ) return 0;
[ee1635c8]560 if ( function->get_name() != fname ) return 0;
[4d4882a]561 FunctionType * ftype = function->get_functionType();
562 if ( ftype->get_parameters().size() != 2 ) return 0;
563
[ce8c12f]564 Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() );
[4d4882a]565 Type * t2 = ftype->get_parameters().back()->get_type();
[ce8c12f]566 assert( t1 );
[4d4882a]567
[ce8c12f]568 if ( ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, SymTab::Indexer() ) ) {
[4d4882a]569 return function;
570 } else {
[ee1635c8]571 return nullptr;
[4d4882a]572 }
573 }
[ee1635c8]574
[207c7e1d]575 FunctionDecl * isAssignment( Declaration * decl ) {
576 return isCopyFunction( decl, "?=?" );
577 }
578 FunctionDecl * isDestructor( Declaration * decl ) {
579 if ( isDestructor( decl->get_name() ) ) {
580 return dynamic_cast< FunctionDecl * >( decl );
581 }
582 return nullptr;
583 }
584 FunctionDecl * isDefaultConstructor( Declaration * decl ) {
585 if ( isConstructor( decl->get_name() ) ) {
586 if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) {
587 if ( func->get_functionType()->get_parameters().size() == 1 ) {
588 return func;
589 }
590 }
591 }
592 return nullptr;
593 }
[ee1635c8]594 FunctionDecl * isCopyConstructor( Declaration * decl ) {
595 return isCopyFunction( decl, "?{}" );
596 }
[2b46a13]597}
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