Changeset 836 for cpp

Timestamp:

12/05/18 21:04:54 (6 years ago)

Author:

Maciej Komosinski

Message:

Introduced ternary conditional operator a?b:c

File:

• cpp/frams/vm/framscript.y (modified) (1 diff)

cpp/frams/vm/framscript.y

@@ -872 +872 @@
  }
 
-
+       | expr '?'
+ {
+ trctx.emitLine();
+// trctx.out->printf("\n####### conditional operator\n");
+ $$.counter=trctx.labelcounter++;
+ warnTruthValue($1);
+ if ($1.constant)
+         {
+         ExtValue::CompareResult cond=$1.compare(ExtValue::zero());
+         $1.counter=0;
+         if (resultIsRelaxedEqual(cond))
+                 trctx.out->printf("jump :_cond_false_%d\n",$$.counter);
+         }
+ else
+         {
+         trstack.adjust(+1);
+         trctx.out->printf("if ~=,m[m0++],:_cond_false_%d\n",$$.counter);
+         }
+ $$.stack=trstack.currentPos();
+// trctx.out->printf("\n####### conditional - true\n");
+ }
+         stackexpr ':'
+ {
+ trctx.emitLine();
+ trctx.out->printf("jump :_cond_end_%d\n",$3.counter);
+ trctx.out->printf(":_cond_false_%d\n",$3.counter);
+// trctx.out->printf("\n####### conditional - false\n");
+ trstack.adjust($3.stack-trstack.currentPos());
+ }
+         stackexpr
+ {
+ trctx.emitLine();
+ trctx.out->printf(":_cond_end_%d\n",$3.counter);
+// trctx.out->printf("\n####### conditional - end\n");
+ $$.ident=false; $$.constant=0; $$.parens=0; $$.assign=0;
+ }
+         
        | expr LSHIFT expr { handleTwoArg($$,$1,$3,LSHIFT,"shift",0,0); }
        | expr RSHIFT expr { handleTwoArg($$,$1,$3,RSHIFT,"shift",1,0); }