Changeset 846 for cpp

Timestamp:

01/06/19 02:44:47 (6 years ago)

Author:

Maciej Komosinski

Message:

• Added support for ternary conditional operator a?b:c

Fixed incorrect stack allocation in some cases of &&

, and for(x in null)

&& and

operators always return one of the input expressions (previously the result was in some cases simplified to 0 or 1)

File:

• cpp/frams/vm/framscript.y (modified) (11 diffs)

cpp/frams/vm/framscript.y

@@ -479 +479 @@
                            }
                    }
+           $$.stack=trstack.currentPos();
            }
            expr_or_objname ')'
@@ -506 +507 @@
            trctx.out->printf(":_loop_end_%d\n",$1.counter);
            trstack.loops.drop();
-           if ($1.stack != trstack.currentPos())
-                   trctx.out->printf("add %d,m0\n",$1.stack-trstack.currentPos());
-           trstack.adjust($1.stack-trstack.currentPos());
+           if ($4.constant)
+                   trstack.adjust($3.stack-trstack.currentPos());
+           int adj=$1.stack-trstack.currentPos();
+           trstack.adjust(adj);
+           if (adj!=0)
+                   trctx.out->printf("add %d,m0\n",adj);
            }
            
@@ -769 +773 @@
  //     pop; goto and_b
  //   else
- //     pop; push 0; goto and_end
+ //     goto and_end
  // and_b:
  //   push b
@@ -776 +780 @@
 // trctx.out->printf("\n####### logic AND\n");
  int c=trctx.labelcounter++;
- $$.setInt(c);
+ $$.counter=c;
  if ($1.constant)
          {
@@ -783 +787 @@
                  {
                  $1.counter=0;
-                 // no stack adjust - next tokens are processed in a different context
-                 trctx.out->printf("push 0\njump :_and_end_%d\n",c);
+                 trctx.out->printf("jump :_and_end_%d\n",c);
                  }
          else
@@ -791 +794 @@
  else
          {
-         trstack.adjust(+1); // stack as if (a==true), b expr is processed
-         trctx.out->printf("if !~,m[m0++],:_and_b_%d\n"
-                           "push 0\n"
+         trctx.out->printf("if !~,m[m0],:_and_b_%d\n" // skip to b if a!~=false, "a" stays on top
                            "jump :_and_end_%d\n"
                            ":_and_b_%d\n"
@@ -801 +802 @@
          expr
  {
- $$.ident=false;
- $$.constant=0;
- if ($4.constant)
+ if ($1.constant)
          {
-         if (!($1.constant && $1.counter==0))
+         if ($1.counter==0)
                  {
-                 ExtValue::CompareResult  cond=$4.compare(ExtValue::zero());
-                 bool value=!resultIsRelaxedEqual(cond);
-                 trstack.adjust(-1);
-                 trctx.out->printf("push %d\n",value);
+                 $$=$1;
+                 if (!$4.constant)
+                         trstack.adjust(+1);
+                 }
+         else
+                 $$=$4;
+         }
+ else
+         {
+         $$.ident=false;
+         $$.constant=0;
+         if ($4.constant)
+                 {
+                 trctx.out->printf("inc m0\n"
+                                   "push %s\n",litstr($4));
+                 }
+         else
+                 {
+                 trstack.adjust(+1);
+                 trctx.out->printf("move m[m0],m[m0+1]\n"
+                                   "inc m0\n"); //drop "a"
                  }
          }
- trctx.out->printf(":_and_end_%d\n",$3.getInt());
+ trctx.out->printf(":_and_end_%d\n",$3.counter);
 // trctx.out->printf("#################\n\n");
  }
@@ -822 +838 @@
  //   push a
  //   if (!a)
- //     pop; goto and_b
+ //     pop; goto or_b
  //   else
- //     pop; push 1; goto and_end
- // and_b:
+ //     goto or_end
+ // or_b:
  //   push b
- // and_end:
+ // or_end:
  trctx.emitLine();
-// trctx.out->printf("\n####### logic AND\n");
+// trctx.out->printf("\n####### logic OR\n");
  int c=trctx.labelcounter++;
- $$.setInt(c);
+ $$.counter=c;
  if ($1.constant)
          {
@@ -838 +854 @@
                  {
                  $1.counter=1;
-                 // no stack adjust - next tokens are processed in a different context
-                 trctx.out->printf("push 1\njump :_or_end_%d\n",c);
+                 trctx.out->printf("jump :_or_end_%d\n",c);
                  }
          else
@@ -846 +861 @@
  else
          {
-         trstack.adjust(+1); // stack for (a==false)
-         trctx.out->printf("if ~=,m[m0++],:_or_b_%d\n"
-                           "push 1\n"
+         trctx.out->printf("if ~=,m[m0],:_or_b_%d\n" // skip to b if a~=false, "a" stays on top
                            "jump :_or_end_%d\n"
                            ":_or_b_%d\n"
@@ -856 +869 @@
          expr
  {
- $$.ident=false;
- $$.constant=0;
- if ($4.constant)
+ if ($1.constant)
          {
-         if (!($1.constant && $1.counter==1))
+         if ($1.counter==1)
                  {
-                 ExtValue::CompareResult cond=$4.compare(ExtValue::zero());
-                 bool value=!resultIsRelaxedEqual(cond);
-                 trstack.adjust(-1);
-                 trctx.out->printf("push %d\n",value);
+                 $$=$1;
+                 if (!$4.constant)
+                         trstack.adjust(+1);
+                 }
+         else
+                 $$=$4;
+         }
+ else
+         {
+         $$.ident=false;
+         $$.constant=0;
+         if ($4.constant)
+                 {
+                 trctx.out->printf("inc m0\n"
+                                   "push %s\n",litstr($4));
+                 }
+         else
+                 {
+                 trstack.adjust(+1);
+                 trctx.out->printf("move m[m0],m[m0+1]\n"
+                                   "inc m0\n"); //drop "a"
                  }
          }
- trctx.out->printf(":_or_end_%d\n",$3.getInt());
+ trctx.out->printf(":_or_end_%d\n",$3.counter);
 // trctx.out->printf("#################\n\n");
  }