[sql] Import reference version of SQLite 3.17..

third_party/sqlite/sqlite-src-3170000/tool/mkopcodec.tcl

+#!/usr/bin/tclsh
+#
+# This TCL script scans the opcodes.h file (which is itself generated by
+# another TCL script) and uses the information gleaned to create the
+# opcodes.c source file.
+#
+# Opcodes.c contains strings which are the symbolic names for the various
+# opcodes used by the VDBE.  These strings are used when disassembling a
+# VDBE program during tracing or as a result of the EXPLAIN keyword.
+#
+puts "/* Automatically generated.  Do not edit */"
+puts "/* See the tool/mkopcodec.tcl script for details. */"
+puts "#if !defined(SQLITE_OMIT_EXPLAIN) \\"
+puts " || defined(VDBE_PROFILE) \\"
+puts " || defined(SQLITE_DEBUG)"
+puts "#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) || defined(SQLITE_DEBUG)"
+puts "# define OpHelp(X) \"\\0\" X"
+puts "#else"
+puts "# define OpHelp(X)"
+puts "#endif"
+puts "const char *sqlite3OpcodeName(int i)\173"
+puts " static const char *const azName\[\] = \173"
+set mx 0
+
+set in [open [lindex $argv 0] rb]
+while {![eof $in]} {
+  set line [gets $in]
+  if {[regexp {^#define OP_} $line]} {
+    set name [lindex $line 1]
+    regsub {^OP_} $name {} name
+    set i [lindex $line 2]
+    set label($i) $name
+    if {$mx<$i} {set mx $i}
+    if {[regexp {synopsis: (.*) \*/} $line all x]} {
+      set synopsis($i) [string trim $x]
+    } else {
+      set synopsis($i) {}
+    }
+  }
+}
+close $in
+
+for {set i 0} {$i<=$mx} {incr i} {
+  puts [format "    /* %3d */ %-18s OpHelp(\"%s\")," \
+         $i \"$label($i)\" $synopsis($i)]
+}
+puts "  \175;"
+puts "  return azName\[i\];"
+puts "\175"
+puts "#endif"