Reduce the space allocated for the runtime virtual machine stack. (CVS 2428)

FossilOrigin-Name: 7d6818da33a87076d1faf35ffc15a3aada0533b3

mkopcodeh.awk

@@ -24,6 +24,7 @@
 # the total library smaller.
 #
 
+
 # Remember the TK_ values from the parse.h file
 /^#define TK_/ {
   tk[$2] = $3
@@ -35,11 +36,16 @@
   gsub(/:/,"",name)
   gsub("\r","",name)
   op[name] = -1
-  for(i=3; i<NF-2; i++){
+  for(i=3; i<NF; i++){
     if($i=="same" && $(i+1)=="as"){
-      op[name] = tk[$(i+2)]
+      sym = $(i+2)
+      sub(/,/,"",sym)
+      op[name] = tk[sym]
       used[op[name]] = 1
-      sameas[op[name]] = $(i+2)
+      sameas[op[name]] = sym
+    }
+    if($i=="stack"){
+      stack[name] = 1
     }
   }
 }
@@ -75,4 +81,31 @@ END {
       printf "#define %-25s %15d\n", sprintf( "OP_NotUsed_%-3d", i ), i
     }
   }
+
+  # Generate the 10 16-bit bitmasks used by function opcodeUsesStack()
+  # in vdbeaux.c. See comments in that function for details.
+  # 
+  stack[0] = 0              # 0..15
+  stack[1] = 0              # 16..31
+  stack[2] = 0              # 32..47
+  stack[3] = 0              # 48..63
+  stack[4] = 0              # 64..79
+  stack[5] = 0              # 80..95
+  stack[6] = 0              # 96..111
+  stack[7] = 0              # 112..127
+  stack[8] = 0              # 128..143
+  stack[9] = 0              # 144..159
+  for(name in op){
+    if( stack[name] ){
+      n = op[name]
+      j = n%16
+      i = ((n - j)/16)
+      stack[i] = stack[i] + (2^j)
+    }
+  }
+  printf "\n"
+  for(i=0; i<10; i++){
+    printf "#define STACK_MASK_%d %d\n", i, stack[i]
+  }
+
 }