Changeset 720a007 for src/ControlStruct/MLEMutator.h

Timestamp:

Mar 14, 2018, 2:06:29 PM (7 years ago)

Author:

Rob Schluntz <rschlunt@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, with_gc

Children:

753f13c9

Parents:

6a276a0

Message:

Implement new fallthrough semantics

File:

• src/ControlStruct/MLEMutator.h (modified) (5 diffs)

src/ControlStruct/MLEMutator.h

@@ -10 +10 @@
 // Created On       : Mon May 18 07:44:20 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Sat Jul 22 09:19:59 2017
-// Update Count     : 35
+// Last Modified On : Thu Mar  8 16:42:32 2018
+// Update Count     : 41
 //
 
@@ -19 +19 @@
 #include <map>                     // for map
 #include <string>                  // for string
+#include <set>                     // for unordered_set
 
 #include "Common/PassVisitor.h"
@@ -29 +30 @@
         class LabelGenerator;
 
-        class MLEMutator : public WithVisitorRef<MLEMutator>, public WithShortCircuiting {
+        class MLEMutator : public WithVisitorRef<MLEMutator>, public WithShortCircuiting, public WithGuards {
+          public:
                 class Entry;
-
-          public:
                 MLEMutator( std::map<Label, Statement *> *t, LabelGenerator *gen = 0 ) : targetTable( t ), breakLabel(std::string("")), generator( gen ) {}
                 ~MLEMutator();
@@ -52 +52 @@
                 Label &get_breakLabel() { return breakLabel; }
                 void set_breakLabel( Label newValue ) { breakLabel = newValue; }
-          private:
+
                 class Entry {
                   public:
-                        explicit Entry( Statement *_loop, Label _breakExit, Label _contExit = Label("") ) :
-                                loop( _loop ), breakExit( _breakExit ), contExit( _contExit ), breakUsed(false), contUsed(false) {}
+                        // specialized constructors for each combination of statement with labelled break/continue/fallthrough that is valid to cleanup the use cases
+                        explicit Entry( ForStmt *stmt, Label breakExit, Label contExit ) :
+                                stmt( stmt ), breakExit( breakExit ), contExit( contExit ) {}
 
-                        bool operator==( const Statement *stmt ) { return loop == stmt; }
-                        bool operator!=( const Statement *stmt ) { return loop != stmt; }
+                        explicit Entry( WhileStmt *stmt, Label breakExit, Label contExit ) :
+                                stmt( stmt ), breakExit( breakExit ), contExit( contExit ) {}
 
-                        bool operator==( const Entry &other ) { return loop == other.get_controlStructure(); }
+                        explicit Entry( CompoundStmt *stmt, Label breakExit ) :
+                                stmt( stmt ), breakExit( breakExit ) {}
 
-                        Statement *get_controlStructure() const { return loop; }
+                        explicit Entry( IfStmt *stmt, Label breakExit ) :
+                                stmt( stmt ), breakExit( breakExit ) {}
+
+                        explicit Entry( CaseStmt *stmt, Label fallExit ) :
+                                stmt( stmt ), fallExit( fallExit ) {}
+
+                        explicit Entry( SwitchStmt *stmt, Label breakExit, Label fallDefaultExit ) :
+                                stmt( stmt ), breakExit( breakExit ), fallDefaultExit( fallDefaultExit ) {}
+
+                        bool operator==( const Statement *other ) { return stmt == other; }
+                        bool operator!=( const Statement *other ) { return stmt != other; }
+
+                        bool operator==( const Entry &other ) { return stmt == other.get_controlStructure(); }
+
+                        Statement *get_controlStructure() const { return stmt; }
 
                         Label useContExit() { contUsed = true; return contExit; }
                         Label useBreakExit() { breakUsed = true; return breakExit; }
+                        Label useFallExit() { fallUsed = true; return fallExit; }
+                        Label useFallDefaultExit() { fallDefaultUsed = true; return fallDefaultExit; }
 
                         bool isContUsed() const { return contUsed; }
                         bool isBreakUsed() const { return breakUsed; }
+                        bool isFallUsed() const { return fallUsed; }
+                        bool isFallDefaultUsed() const { return fallDefaultUsed; }
+                        void seenDefault() { fallDefaultValid = false; }
+                        bool isFallDefaultValid() const { return fallDefaultValid; }
                   private:
-                        Statement *loop;
-                        Label breakExit, contExit;
-                        bool breakUsed, contUsed;
+                        Statement *stmt;
+                        Label breakExit, contExit, fallExit, fallDefaultExit;
+                        bool breakUsed = false, contUsed = false, fallUsed = false, fallDefaultUsed = false;
+                        bool fallDefaultValid = true;
                 };
 
+          private:
                 std::map< Label, Statement * > *targetTable;
+                std::set< Label > fallthroughLabels;
                 std::list< Entry > enclosingControlStructures;
                 Label breakLabel;
@@ -87 +112 @@
                 Statement * posthandleLoopStmt( LoopClass * loopStmt );
 
-                void fixBlock( std::list< Statement * > &kids );
+                void fixBlock( std::list< Statement * > &kids, bool caseClause = false );
         };
 } // namespace ControlStruct