| 1 | #include <list> |
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| 2 | #include <cassert> |
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| 3 | |
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| 4 | #include "SynTree/Type.h" |
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| 5 | #include "SynTree/Statement.h" |
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| 6 | #include "SynTree/Expression.h" |
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| 7 | #include "SynTree/Declaration.h" |
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| 8 | |
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| 9 | #include "LabelTypeChecker.h" |
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| 10 | |
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| 11 | |
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| 12 | namespace ControlStruct { |
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| 13 | void LabelTypeChecker::visit(UntypedExpr *untypedExpr){ |
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| 14 | assert( untypedExpr != 0 ); |
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| 15 | NameExpr *fname; |
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| 16 | if ( ((fname = dynamic_cast<NameExpr *>(untypedExpr->get_function())) != 0) |
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| 17 | && fname->get_name() == std::string("LabAddress") ) |
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| 18 | std::cerr << "Taking the label of an address." << std::endl; |
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| 19 | else { |
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| 20 | acceptAll( untypedExpr->get_results(), *this ); |
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| 21 | acceptAll( untypedExpr->get_args(), *this ); |
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| 22 | } // if |
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| 23 | return; |
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| 24 | } |
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| 25 | |
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| 26 | void LabelTypeChecker::visit(CompoundStmt *compoundStmt) { |
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| 27 | index.enterScope(); |
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| 28 | acceptAll( compoundStmt->get_kids(), *this ); |
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| 29 | index.leaveScope(); |
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| 30 | } |
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| 31 | |
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| 32 | void LabelTypeChecker::visit(DeclStmt *declStmt){ |
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| 33 | declStmt->accept( index ); |
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| 34 | |
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| 35 | //ObjectDecl *odecl = 0; |
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| 36 | // if ( ( odecl = dynamic_cast<ObjectDecl *>(declStmt->get_decl()) ) != 0 ){ |
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| 37 | return; |
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| 38 | } |
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| 39 | |
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| 40 | void LabelTypeChecker::visit(BranchStmt *branchStmt) { |
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| 41 | if ( branchStmt->get_type() != BranchStmt::Goto ) return; |
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| 42 | Expression *target; |
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| 43 | if ( (target = branchStmt->get_computedTarget()) == 0 ) return; |
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| 44 | |
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| 45 | NameExpr *name; |
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| 46 | if ( ((name = dynamic_cast<NameExpr *>(target)) == 0) ) |
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| 47 | return; // Not a name expression |
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| 48 | |
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| 49 | std::list< DeclarationWithType * > interps; |
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| 50 | index.lookupId(name->get_name(), interps); |
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| 51 | if ( interps.size() != 1) |
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| 52 | // in case of multiple declarations |
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| 53 | throw SemanticError("Illegal label expression: " + name->get_name() ); |
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| 54 | |
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| 55 | PointerType *ptr; |
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| 56 | if ( (ptr = dynamic_cast<PointerType *>(interps.front()->get_type())) != 0 ) |
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| 57 | if ( dynamic_cast<VoidType *>(ptr->get_base()) != 0 ) |
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| 58 | return; |
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| 59 | else |
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| 60 | throw SemanticError("Wrong type of parameter for computed goto"); |
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| 61 | else |
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| 62 | throw SemanticError("Wrong type of parameter for computed goto"); |
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| 63 | |
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| 64 | return; |
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| 65 | } |
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| 66 | } // namespace ControlStruct |
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