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commit of sqlite 3.6.0
This commit is contained in:
Stephen Lombardo
+157
@@ -0,0 +1,157 @@
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#!/usr/bin/awk -f
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#
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# Generate the file opcodes.h.
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#
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# This AWK script scans a concatenation of the parse.h output file from the
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# parser and the vdbe.c source file in order to generate the opcodes numbers
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# for all opcodes.
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#
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# The lines of the vdbe.c that we are interested in are of the form:
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#
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# case OP_aaaa: /* same as TK_bbbbb */
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#
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# The TK_ comment is optional. If it is present, then the value assigned to
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# the OP_ is the same as the TK_ value. If missing, the OP_ value is assigned
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# a small integer that is different from every other OP_ value.
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#
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# We go to the trouble of making some OP_ values the same as TK_ values
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# as an optimization. During parsing, things like expression operators
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# are coded with TK_ values such as TK_ADD, TK_DIVIDE, and so forth. Later
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# during code generation, we need to generate corresponding opcodes like
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# OP_Add and OP_Divide. By making TK_ADD==OP_Add and TK_DIVIDE==OP_Divide,
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# code to translate from one to the other is avoided. This makes the
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# code generator run (infinitesimally) faster and more importantly it makes
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# the library footprint smaller.
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#
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# This script also scans for lines of the form:
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#
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# case OP_aaaa: /* no-push */
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#
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# When the no-push comment is found on an opcode, it means that that
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# opcode does not leave a result on the stack. By identifying which
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# opcodes leave results on the stack it is possible to determine a
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# much smaller upper bound on the size of the stack. This allows
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# a smaller stack to be allocated, which is important to embedded
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# systems with limited memory space. This script generates a series
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# of "NOPUSH_MASK" defines that contain bitmaps of opcodes that leave
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# results on the stack. The NOPUSH_MASK defines are used in vdbeaux.c
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# to help determine the maximum stack size.
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#
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# Remember the TK_ values from the parse.h file
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/^#define TK_/ {
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tk[$2] = 0+$3
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}
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# Scan for "case OP_aaaa:" lines in the vdbe.c file
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/^case OP_/ {
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name = $2
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sub(/:/,"",name)
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sub("\r","",name)
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op[name] = -1
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jump[name] = 0
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out2_prerelease[name] = 0
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in1[name] = 0
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in2[name] = 0
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in3[name] = 0
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out3[name] = 0
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for(i=3; i<NF; i++){
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if($i=="same" && $(i+1)=="as"){
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sym = $(i+2)
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sub(/,/,"",sym)
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op[name] = tk[sym]
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used[op[name]] = 1
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sameas[op[name]] = sym
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}
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x = $i
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sub(",","",x)
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if(x=="jump"){
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jump[name] = 1
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}else if(x=="out2-prerelease"){
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out2_prerelease[name] = 1
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}else if(x=="in1"){
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in1[name] = 1
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}else if(x=="in2"){
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in2[name] = 1
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}else if(x=="in3"){
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in3[name] = 1
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}else if(x=="out3"){
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out3[name] = 1
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}
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}
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}
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# Assign numbers to all opcodes and output the result.
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END {
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cnt = 0
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max = 0
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print "/* Automatically generated. Do not edit */"
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print "/* See the mkopcodeh.awk script for details */"
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op["OP_Noop"] = -1;
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op["OP_Explain"] = -1;
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for(name in op){
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if( op[name]<0 ){
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cnt++
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while( used[cnt] ) cnt++
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op[name] = cnt
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}
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used[op[name]] = 1;
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if( op[name]>max ) max = op[name]
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printf "#define %-25s %15d", name, op[name]
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if( sameas[op[name]] ) {
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printf " /* same as %-12s*/", sameas[op[name]]
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}
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printf "\n"
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}
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seenUnused = 0;
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for(i=1; i<max; i++){
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if( !used[i] ){
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if( !seenUnused ){
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printf "\n/* The following opcode values are never used */\n"
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seenUnused = 1
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}
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printf "#define %-25s %15d\n", sprintf( "OP_NotUsed_%-3d", i ), i
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}
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}
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# Generate the bitvectors:
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#
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# bit 0: jump
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# bit 1: pushes a result onto stack
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# bit 2: output to p1. release p1 before opcode runs
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#
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for(i=0; i<=max; i++) bv[i] = 0;
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for(name in op){
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x = op[name]
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a0 = a1 = a2 = a3 = a4 = a5 = a6 = a7 = 0
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# a8 = a9 = a10 = a11 = a12 = a13 = a14 = a15 = 0
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if( jump[name] ) a0 = 1;
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if( out2_prerelease[name] ) a1 = 2;
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if( in1[name] ) a2 = 4;
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if( in2[name] ) a3 = 8;
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if( in3[name] ) a4 = 16;
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if( out3[name] ) a5 = 32;
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# bv[x] = a0+a1+a2+a3+a4+a5+a6+a7+a8+a9+a10+a11+a12+a13+a14+a15;
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bv[x] = a0+a1+a2+a3+a4+a5+a6+a7;
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}
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print "\n"
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print "/* Properties such as \"out2\" or \"jump\" that are specified in"
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print "** comments following the \"case\" for each opcode in the vdbe.c"
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print "** are encoded into bitvectors as follows:"
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print "*/"
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print "#define OPFLG_JUMP 0x0001 /* jump: P2 holds jmp target */"
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print "#define OPFLG_OUT2_PRERELEASE 0x0002 /* out2-prerelease: */"
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print "#define OPFLG_IN1 0x0004 /* in1: P1 is an input */"
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print "#define OPFLG_IN2 0x0008 /* in2: P2 is an input */"
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print "#define OPFLG_IN3 0x0010 /* in3: P3 is an input */"
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print "#define OPFLG_OUT3 0x0020 /* out3: P3 is an output */"
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print "#define OPFLG_INITIALIZER {\\"
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for(i=0; i<=max; i++){
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if( i%8==0 ) printf("/* %3d */",i)
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printf " 0x%02x,", bv[i]
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if( i%8==7 ) printf("\\\n");
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}
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print "}"
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}
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