264 lines
7.1 KiB
Tcl
264 lines
7.1 KiB
Tcl
#!/usr/bin/tclsh
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#
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# Generate the file opcodes.h.
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#
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# This TCL 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 smaller and faster.
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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: /* jump, in1, in2, in3, out2-prerelease, out3 */
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#
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# When such comments are found on an opcode, it means that certain
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# properties apply to that opcode. Set corresponding flags using the
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# OPFLG_INITIALIZER macro.
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#
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set in stdin
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set currentOp {}
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set nOp 0
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while {![eof $in]} {
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set line [gets $in]
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# Remember the TK_ values from the parse.h file.
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# NB: The "TK_" prefix stands for "ToKen", not the graphical Tk toolkit
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# commonly associated with TCL.
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#
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if {[regexp {^#define TK_} $line]} {
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set tk([lindex $line 1]) [lindex $line 2]
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continue
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}
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# Find "/* Opcode: " lines in the vdbe.c file. Each one introduces
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# a new opcode. Remember which parameters are used.
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#
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if {[regexp {^.. Opcode: } $line]} {
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set currentOp OP_[lindex $line 2]
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set m 0
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foreach term $line {
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switch $term {
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P1 {incr m 1}
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P2 {incr m 2}
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P3 {incr m 4}
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P4 {incr m 8}
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P5 {incr m 16}
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}
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}
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set paramused($currentOp) $m
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}
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# Find "** Synopsis: " lines that follow Opcode:
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#
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if {[regexp {^.. Synopsis: (.*)} $line all x] && $currentOp!=""} {
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set synopsis($currentOp) [string trim $x]
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}
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# Scan for "case OP_aaaa:" lines in the vdbe.c file
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#
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if {[regexp {^case OP_} $line]} {
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set line [split $line]
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set name [string trim [lindex $line 1] :]
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set op($name) -1
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set jump($name) 0
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set in1($name) 0
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set in2($name) 0
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set in3($name) 0
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set out2($name) 0
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set out3($name) 0
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for {set i 3} {$i<[llength $line]-1} {incr i} {
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switch [string trim [lindex $line $i] ,] {
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same {
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incr i
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if {[lindex $line $i]=="as"} {
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incr i
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set sym [string trim [lindex $line $i] ,]
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set val $tk($sym)
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set op($name) $val
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set used($val) 1
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set sameas($val) $sym
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set def($val) $name
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}
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}
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jump {set jump($name) 1}
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in1 {set in1($name) 1}
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in2 {set in2($name) 1}
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in3 {set in3($name) 1}
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out2 {set out2($name) 1}
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out3 {set out3($name) 1}
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}
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}
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set order($nOp) $name
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incr nOp
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}
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}
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# Assign numbers to all opcodes and output the result.
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#
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puts "/* Automatically generated. Do not edit */"
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puts "/* See the tool/mkopcodeh.tcl script for details */"
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foreach name {OP_Noop OP_Explain} {
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set jump($name) 0
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set in1($name) 0
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set in2($name) 0
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set in3($name) 0
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set out2($name) 0
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set out3($name) 0
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set op($name) -1
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set order($nOp) $name
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incr nOp
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}
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# The following are the opcodes that are processed by resolveP2Values()
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#
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set rp2v_ops {
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OP_Transaction
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OP_AutoCommit
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OP_Savepoint
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OP_Checkpoint
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OP_Vacuum
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OP_JournalMode
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OP_VUpdate
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OP_VFilter
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OP_Next
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OP_NextIfOpen
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OP_SorterNext
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OP_Prev
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OP_PrevIfOpen
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}
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# Assign small values to opcodes that are processed by resolveP2Values()
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# to make code generation for the switch() statement smaller and faster.
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#
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set cnt -1
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for {set i 0} {$i<$nOp} {incr i} {
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set name $order($i)
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if {[lsearch $rp2v_ops $name]>=0} {
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incr cnt
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while {[info exists used($cnt)]} {incr cnt}
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set op($name) $cnt
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set used($cnt) 1
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set def($cnt) $name
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}
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}
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# Assign the next group of values to JUMP opcodes
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#
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for {set i 0} {$i<$nOp} {incr i} {
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set name $order($i)
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if {$op($name)>=0} continue
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if {!$jump($name)} continue
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incr cnt
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while {[info exists used($cnt)]} {incr cnt}
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set op($name) $cnt
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set used($cnt) 1
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set def($cnt) $name
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}
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# Find the numeric value for the largest JUMP opcode
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#
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set mxJump -1
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for {set i 0} {$i<$nOp} {incr i} {
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set name $order($i)
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if {$jump($name) && $op($name)>$mxJump} {set mxJump $op($name)}
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}
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# Generate the numeric values for all remaining opcodes
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#
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for {set i 0} {$i<$nOp} {incr i} {
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set name $order($i)
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if {$op($name)<0} {
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incr cnt
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while {[info exists used($cnt)]} {incr cnt}
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set op($name) $cnt
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set used($cnt) 1
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set def($cnt) $name
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}
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}
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set max $cnt
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for {set i 0} {$i<$nOp} {incr i} {
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if {![info exists used($i)]} {
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set def($i) "OP_NotUsed_$i"
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}
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set name $def($i)
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puts -nonewline [format {#define %-16s %3d} $name $i]
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set com {}
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if {[info exists sameas($i)]} {
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set com "same as $sameas($i)"
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}
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if {[info exists synopsis($name)]} {
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set x $synopsis($name)
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if {$com==""} {
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set com "synopsis: $x"
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} else {
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append com ", synopsis: $x"
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}
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}
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if {$com!=""} {
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puts -nonewline [format " /* %-42s */" $com]
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}
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puts ""
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}
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# Generate the bitvectors:
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#
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set bv(0) 0
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for {set i 0} {$i<=$max} {incr i} {
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set name $def($i)
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set x 0
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if {$jump($name)} {incr x 1}
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if {$in1($name)} {incr x 2}
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if {$in2($name)} {incr x 4}
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if {$in3($name)} {incr x 8}
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if {$out2($name)} {incr x 16}
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if {$out3($name)} {incr x 32}
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set bv($i) $x
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}
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puts ""
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puts "/* Properties such as \"out2\" or \"jump\" that are specified in"
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puts "** comments following the \"case\" for each opcode in the vdbe.c"
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puts "** are encoded into bitvectors as follows:"
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puts "*/"
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puts "#define OPFLG_JUMP 0x01 /* jump: P2 holds jmp target */"
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puts "#define OPFLG_IN1 0x02 /* in1: P1 is an input */"
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puts "#define OPFLG_IN2 0x04 /* in2: P2 is an input */"
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puts "#define OPFLG_IN3 0x08 /* in3: P3 is an input */"
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puts "#define OPFLG_OUT2 0x10 /* out2: P2 is an output */"
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puts "#define OPFLG_OUT3 0x20 /* out3: P3 is an output */"
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puts "#define OPFLG_INITIALIZER \173\\"
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for {set i 0} {$i<=$max} {incr i} {
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if {$i%8==0} {
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puts -nonewline [format "/* %3d */" $i]
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}
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puts -nonewline [format " 0x%02x," $bv($i)]
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if {$i%8==7} {
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puts "\\"
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}
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}
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puts "\175"
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puts ""
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puts "/* The sqlite3P2Values() routine is able to run faster if it knows"
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puts "** the value of the largest JUMP opcode. The smaller the maximum"
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puts "** JUMP opcode the better, so the mkopcodeh.tcl script that"
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puts "** generated this include file strives to group all JUMP opcodes"
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puts "** together near the beginning of the list."
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puts "*/"
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puts "#define SQLITE_MX_JUMP_OPCODE $mxJump /* Maximum JUMP opcode */"
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