ea5989276a
with the FORMAT_MESSAGE_IGNORE_INSERTS option. Additionally updated to ensure strings are returned as UTF8. Ticket 39c85e8a4e. FossilOrigin-Name: 761396f8cb79be34853ba698a65af54874c3c10e
126 lines
4.4 KiB
Tcl
126 lines
4.4 KiB
Tcl
#!/usr/bin/tcl
|
|
#
|
|
# This script makes modifications to the vdbe.c source file which reduce
|
|
# the amount of stack space required by the sqlite3VdbeExec() routine.
|
|
#
|
|
# The modifications performed by this script are optional. The vdbe.c
|
|
# source file will compile correctly with and without the modifications
|
|
# performed by this script. And all routines within vdbe.c will compute
|
|
# the same result. The modifications made by this script merely help
|
|
# the C compiler to generate code for sqlite3VdbeExec() that uses less
|
|
# stack space.
|
|
#
|
|
# Script usage:
|
|
#
|
|
# mv vdbe.c vdbe.c.template
|
|
# tclsh vdbe-compress.tcl <vdbe.c.template >vdbe.c
|
|
#
|
|
# Modifications made:
|
|
#
|
|
# All modifications are within the sqlite3VdbeExec() function. The
|
|
# modifications seek to reduce the amount of stack space allocated by
|
|
# this routine by moving local variable declarations out of individual
|
|
# opcode implementations and into a single large union. The union contains
|
|
# a separate structure for each opcode and that structure contains the
|
|
# local variables used by that opcode. In this way, the total amount
|
|
# of stack space required by sqlite3VdbeExec() is reduced from the
|
|
# sum of all local variables to the maximum of the local variable space
|
|
# required for any single opcode.
|
|
#
|
|
# In order to be recognized by this script, local variables must appear
|
|
# on the first line after the open curly-brace that begins a new opcode
|
|
# implementation. Local variables must not have initializers, though they
|
|
# may be commented.
|
|
#
|
|
# The union definition is inserted in place of a special marker comment
|
|
# in the preamble to the sqlite3VdbeExec() implementation.
|
|
#
|
|
#############################################################################
|
|
#
|
|
set beforeUnion {} ;# C code before union
|
|
set unionDef {} ;# C code of the union
|
|
set afterUnion {} ;# C code after the union
|
|
set sCtr 0 ;# Context counter
|
|
|
|
# Read program text up to the spot where the union should be
|
|
# inserted.
|
|
#
|
|
while {![eof stdin]} {
|
|
set line [gets stdin]
|
|
if {[regexp {INSERT STACK UNION HERE} $line]} break
|
|
append beforeUnion $line\n
|
|
}
|
|
|
|
# Process the remaining text. Build up the union definition as we go.
|
|
#
|
|
set vlist {}
|
|
set seenDecl 0
|
|
set namechars {abcdefghijklmnopqrstuvwxyz}
|
|
set nnc [string length $namechars]
|
|
while {![eof stdin]} {
|
|
set line [gets stdin]
|
|
if {[regexp "^case (OP_\\w+): \173" $line all operator]} {
|
|
append afterUnion $line\n
|
|
set vlist {}
|
|
while {![eof stdin]} {
|
|
set line [gets stdin]
|
|
if {[regexp {^ +(const )?\w+ \**(\w+)(\[.*\])?;} $line \
|
|
all constKeyword vname notused1]} {
|
|
if {!$seenDecl} {
|
|
set sname {}
|
|
append sname [string index $namechars [expr {$sCtr/$nnc}]]
|
|
append sname [string index $namechars [expr {$sCtr%$nnc}]]
|
|
incr sCtr
|
|
append unionDef " struct ${operator}_stack_vars \173\n"
|
|
append afterUnion \
|
|
"#if 0 /* local variables moved into u.$sname */\n"
|
|
set seenDecl 1
|
|
}
|
|
append unionDef " $line\n"
|
|
append afterUnion $line\n
|
|
lappend vlist $vname
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
if {$seenDecl} {
|
|
append unionDef " \175 $sname;\n"
|
|
append afterUnion "#endif /* local variables moved into u.$sname */\n"
|
|
}
|
|
set seenDecl 0
|
|
}
|
|
if {[regexp "^\175" $line]} {
|
|
append afterUnion $line\n
|
|
set vlist {}
|
|
} elseif {[llength $vlist]>0} {
|
|
append line " "
|
|
foreach v $vlist {
|
|
regsub -all "(\[^a-zA-Z0-9>.\])${v}(\\W)" $line "\\1u.$sname.$v\\2" line
|
|
regsub -all "(\[^a-zA-Z0-9>.\])${v}(\\W)" $line "\\1u.$sname.$v\\2" line
|
|
}
|
|
append afterUnion [string trimright $line]\n
|
|
} elseif {$line=="" && [eof stdin]} {
|
|
# no-op
|
|
} else {
|
|
append afterUnion $line\n
|
|
}
|
|
}
|
|
|
|
# Output the resulting text.
|
|
#
|
|
puts -nonewline $beforeUnion
|
|
puts " /********************************************************************"
|
|
puts " ** Automatically generated code"
|
|
puts " **"
|
|
puts " ** The following union is automatically generated by the"
|
|
puts " ** vdbe-compress.tcl script. The purpose of this union is to"
|
|
puts " ** reduce the amount of stack space required by this function."
|
|
puts " ** See comments in the vdbe-compress.tcl script for details."
|
|
puts " */"
|
|
puts " union vdbeExecUnion \173"
|
|
puts -nonewline $unionDef
|
|
puts " \175 u;"
|
|
puts " /* End automatically generated code"
|
|
puts " ********************************************************************/"
|
|
puts -nonewline $afterUnion
|