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authorSVN Migration <svn@php.net>2006-10-15 21:09:28 +0000
committerSVN Migration <svn@php.net>2006-10-15 21:09:28 +0000
commit88ec761548b66f58acc1a86cdd0fc164ca925476 (patch)
treed0af978fa00d83bb1d82c613f66477fbd6bb18aa /ext/pdo_sqlite/sqlite/mkopcodeh.awk
parent268984b4787e797db6054313fc9ba3b9e845306e (diff)
downloadphp-git-PECL_OPENSSL.tar.gz
This commit was manufactured by cvs2svn to create branch 'PECL_OPENSSL'.PECL_OPENSSL
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-#!/usr/bin/awk -f
-#
-# Generate the file opcodes.h.
-#
-# This AWK script scans a concatenation of the parse.h output file from the
-# parser and the vdbe.c source file in order to generate the opcodes numbers
-# for all opcodes.
-#
-# The lines of the vdbe.c that we are interested in are of the form:
-#
-# case OP_aaaa: /* same as TK_bbbbb */
-#
-# The TK_ comment is optional. If it is present, then the value assigned to
-# the OP_ is the same as the TK_ value. If missing, the OP_ value is assigned
-# a small integer that is different from every other OP_ value.
-#
-# We go to the trouble of making some OP_ values the same as TK_ values
-# as an optimization. During parsing, things like expression operators
-# are coded with TK_ values such as TK_ADD, TK_DIVIDE, and so forth. Later
-# during code generation, we need to generate corresponding opcodes like
-# OP_Add and OP_Divide. By making TK_ADD==OP_Add and TK_DIVIDE==OP_Divide,
-# code to translate from one to the other is avoided. This makes the
-# code generator run (infinitesimally) faster and more importantly it makes
-# the library footprint smaller.
-#
-# This script also scans for lines of the form:
-#
-# case OP_aaaa: /* no-push */
-#
-# When the no-push comment is found on an opcode, it means that that
-# opcode does not leave a result on the stack. By identifying which
-# opcodes leave results on the stack it is possible to determine a
-# much smaller upper bound on the size of the stack. This allows
-# a smaller stack to be allocated, which is important to embedded
-# systems with limited memory space. This script generates a series
-# of "NOPUSH_MASK" defines that contain bitmaps of opcodes that leave
-# results on the stack. The NOPUSH_MASK defines are used in vdbeaux.c
-# to help determine the maximum stack size.
-#
-
-
-# Remember the TK_ values from the parse.h file
-/^#define TK_/ {
- tk[$2] = $3
-}
-
-# Scan for "case OP_aaaa:" lines in the vdbe.c file
-/^case OP_/ {
- name = $2
- gsub(/:/,"",name)
- gsub("\r","",name)
- op[name] = -1
- for(i=3; i<NF; i++){
- if($i=="same" && $(i+1)=="as"){
- sym = $(i+2)
- sub(/,/,"",sym)
- op[name] = tk[sym]
- used[op[name]] = 1
- sameas[op[name]] = sym
- }
- if($i=="no-push"){
- nopush[name] = 1
- }
- }
-}
-
-# Assign numbers to all opcodes and output the result.
-END {
- cnt = 0
- max = 0
- print "/* Automatically generated. Do not edit */"
- print "/* See the mkopcodeh.awk script for details */"
- for(name in op){
- if( op[name]<0 ){
- cnt++
- while( used[cnt] ) cnt++
- op[name] = cnt
- }
- used[op[name]] = 1;
- if( op[name]>max ) max = op[name]
- printf "#define %-25s %15d", name, op[name]
- if( sameas[op[name]] ) {
- printf " /* same as %-12s*/", sameas[op[name]]
- }
- printf "\n"
-
- }
- seenUnused = 0;
- for(i=1; i<max; i++){
- if( !used[i] ){
- if( !seenUnused ){
- printf "\n/* The following opcode values are never used */\n"
- seenUnused = 1
- }
- 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.
- #
- nopush[0] = 0 # 0..15
- nopush[1] = 0 # 16..31
- nopush[2] = 0 # 32..47
- nopush[3] = 0 # 48..63
- nopush[4] = 0 # 64..79
- nopush[5] = 0 # 80..95
- nopush[6] = 0 # 96..111
- nopush[7] = 0 # 112..127
- nopush[8] = 0 # 128..143
- nopush[9] = 0 # 144..159
- for(name in op){
- if( nopush[name] ){
- n = op[name]
- j = n%16
- i = ((n - j)/16)
- nopush[i] = nopush[i] + (2^j)
- }
- }
- printf "\n"
- print "/* Opcodes that are guaranteed to never push a value onto the stack"
- print "** contain a 1 their corresponding position of the following mask"
- print "** set. See the opcodeNoPush() function in vdbeaux.c */"
- for(i=0; i<10; i++){
- printf "#define NOPUSH_MASK_%d 0x%04x\n", i, nopush[i]
- }
-}