commit 43c4ac8bfecba96e4db6d075c5fa743a4fe25ea5
author drh <drh@noemail.net> Mon Feb 26 21:26:27 2018 +0000
committer drh <drh@noemail.net> Mon Feb 26 21:26:27 2018 +0000
tree dac39511b539230b7c1a7a7e125b8ad7177dc424
parent 171d16bb2187b41636980b809d04d923e2811523

Code simplifications.  New test cases.

FossilOrigin-Name: 57508518ef9d003d259ba98dcc32e5104aca26731a7161808741fe10bc0830d0

src/expr.c

diff --git a/src/expr.c b/src/expr.c
index 75d8db7..fae2c11 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1123,7 +1123,7 @@
   assert( flags==EXPRDUP_REDUCE || flags==0 ); /* Only one flag value allowed */
   assert( EXPR_FULLSIZE<=0xfff );
   assert( (0xfff & (EP_Reduced|EP_TokenOnly))==0 );
-  if( 0==flags || p->op==TK_SELECT_COLUMN || p->op==TK_TRUEFALSE ){
+  if( 0==flags || p->op==TK_SELECT_COLUMN ){
     nSize = EXPR_FULLSIZE;
   }else{
     assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
@@ -1743,14 +1743,22 @@
    || sqlite3StrICmp(pExpr->u.zToken, "false")==0
   ){
     pExpr->op = TK_TRUEFALSE;
-    pExpr->iTable = pExpr->u.zToken[4]==0;
-    pExpr->pTab = 0;
-    ExprSetProperty(pExpr, EP_NoReduce);
     return 1;
   }
   return 0;
 }
 
+/*
+** The argument is one of a TK_TRUEFALSE term.  Return 1 if it is TRUE
+** and 0 if it is FALSE.
+*/
+int sqlite3ExprTruthOperand(const Expr *pExpr){
+  assert( pExpr->op==TK_TRUEFALSE );
+  assert( sqlite3StrICmp(pExpr->u.zToken,"true")==0
+       || sqlite3StrICmp(pExpr->u.zToken,"false")==0 );
+  return pExpr->u.zToken[4]==0;
+}
+
 
 /*
 ** These routines are Walker callbacks used to check expressions to
@@ -3570,7 +3578,7 @@
       return target;
     }
     case TK_TRUEFALSE: {
-      sqlite3VdbeAddOp2(v, OP_Integer, pExpr->iTable, target);
+      sqlite3VdbeAddOp2(v, OP_Integer, sqlite3ExprTruthOperand(pExpr), target);
       return target;
     }
 #ifndef SQLITE_OMIT_FLOATING_POINT
@@ -3729,13 +3737,12 @@
       break;
     }
     case TK_TRUTH: {
-      assert( pExpr->pRight->op==TK_TRUEFALSE );
-      assert( pExpr->pRight->iTable==0 || pExpr->pRight->iTable==1 );
-      assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
+      int isTrue;
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       testcase( regFree1==0 );
-      sqlite3VdbeAddOp4Int(v, OP_IsTrue, r1, inReg, !pExpr->pRight->iTable,
-                           pExpr->pRight->iTable ^ (pExpr->op2==TK_IS));
+      isTrue = sqlite3ExprTruthOperand(pExpr->pRight);
+      sqlite3VdbeAddOp4Int(v, OP_IsTrue, r1, inReg, !isTrue,
+                           isTrue ^ (pExpr->op2==TK_IS));
       break;
     }
     case TK_ISNULL:
@@ -4515,13 +4522,13 @@
     }
     case TK_TRUTH: {
       int isNot;
+      int isTrue;
       testcase( jumpIfNull==0 );
-      assert( pExpr->pRight->op==TK_TRUEFALSE );
-      assert( pExpr->pRight->iTable==0 || pExpr->pRight->iTable==1 );
-      testcase( pExpr->pRight->iTable==0 );
-      assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
       isNot = pExpr->op2==TK_ISNOT;
-      if( pExpr->pRight->iTable ^ isNot ){
+      isTrue = sqlite3ExprTruthOperand(pExpr->pRight);
+      testcase( isTrue && isNot );
+      testcase( isTrue && !isNot );
+      if( isTrue ^ isNot ){
         sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest,
                           isNot ? SQLITE_JUMPIFNULL : 0);
       }else{
@@ -4685,15 +4692,15 @@
       break;
     }
     case TK_TRUTH: {
-      testcase( jumpIfNull==0 );
       int isNot;
+      int isTrue;
       testcase( jumpIfNull==0 );
-      assert( pExpr->pRight->op==TK_TRUEFALSE );
-      assert( pExpr->pRight->iTable==0 || pExpr->pRight->iTable==1 );
-      testcase( pExpr->pRight->iTable==0 );
       assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
       isNot = pExpr->op2==TK_ISNOT;
-      if( pExpr->pRight->iTable ^ isNot ){
+      isTrue = sqlite3ExprTruthOperand(pExpr->pRight);
+      testcase( isTrue && isNot );
+      testcase( isTrue && !isNot );
+      if( isTrue ^ isNot ){
         /* IS TRUE and IS NOT FALSE */
         sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest,
                            isNot ? 0 : SQLITE_JUMPIFNULL);