Changeset 4162aea9

Timestamp:

Jun 3, 2015, 11:09:48 PM (9 years ago)

Author:

Rob Schluntz <rschlunt@…>

Branches:

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

Children:

1136d96

Parents:

27de955

Message:

documentation and update control_structures.c example

Location:

src

Files:

• ControlStruct/ChooseMutator.cc (modified) (2 diffs)
• ControlStruct/Mutate.cc (modified) (2 diffs)
• examples/control_structures.c (modified) (1 diff)

src/ControlStruct/ChooseMutator.cc

@@ -9 +9 @@
 // Author           : Rodolfo G. Esteves
 // Created On       : Mon May 18 07:44:20 2015
-// Last Modified By : Peter A. Buhr
-// Last Modified On : Tue May 19 15:31:39 2015
-// Update Count     : 2
+// Last Modified By : Rob Schluntz
+// Last Modified On : Wed Jun 03 15:30:20 2015
+// Update Count     : 5
 //
 
@@ -44 +44 @@
                 std::list< Statement * > &stmts = caseStmt->get_statements();
 
+                // the difference between switch and choose is that switch has an implicit fallthrough
+                // to the next case, whereas choose has an implicit break at the end of the current case.
+                // thus to transform a choose statement into a switch, we only need to insert breaks at the
+                // end of any case that doesn't already end in a break and that doesn't end in a fallthru
+
                 if ( insideChoose ) {
                         BranchStmt *posBrk;

src/ControlStruct/Mutate.cc

@@ -9 +9 @@
 // Author           : Rodolfo G. Esteves
 // Created On       : Mon May 18 07:44:20 2015
-// Last Modified By : Peter A. Buhr
-// Last Modified On : Tue May 19 15:32:52 2015
-// Update Count     : 2
+// Last Modified By : Rob Schluntz
+// Last Modified On : Wed Jun 03 23:08:43 2015
+// Update Count     : 5
 //
 
@@ -37 +37 @@
         void mutate( std::list< Declaration * > translationUnit ) {
                 // ForExprMutator formut;
+
+                // normalizes label definitions and generates multi-level
+                // exit labels
                 LabelFixer lfix;
+
+                // transform choose statements into switch statements
                 ChooseMutator chmut;
+
+                // expand case ranges and turn fallthru into a null statement
                 CaseRangeMutator ranges;  // has to run after ChooseMutator
+
                 //ExceptMutator exc;
                 // LabelTypeChecker lbl;

src/examples/control_structures.c

@@ -18 +18 @@
                 L2: switch ( 3_333_333 ) {                                              // underscores in constant
                         case 1,2,3:                                                                     // 4~8, 4...8 not working
+                        case 4~8:
                                 L3: for ( ;; ) {
                                         L4: for ( ;; ) {