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sqlcipher/mkopcodeh.awk at prerelease · PHPDOTSQL/sqlcipher · GitHub
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mkopcodeh.awk
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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: /* jump, in1, in2, in3, out2-prerelease, out3 */
#
# When such comments are found on an opcode, it means that certain
# properties apply to that opcode. Set corresponding flags using the
# OPFLG_INITIALIZER macro.
#
# Remember the TK_ values from the parse.h file
/
^
#define TK_
/ {
tk
[
$2
]
=
0
+
$3
}
# Scan for "case OP_aaaa:" lines in the vdbe.c file
/
^
case OP_
/ {
name
=
$2
sub
(/
:
/,
"
"
,name)
sub
(
"
\r
"
,
"
"
,name)
op
[
name
]
=
-
1
jump
[
name
]
=
0
out2_prerelease
[
name
]
=
0
in1
[
name
]
=
0
in2
[
name
]
=
0
in3
[
name
]
=
0
out2
[
name
]
=
0
out3
[
name
]
=
0
for
(i
=
3
; i
<
NF
; i
++
){
if
($i
==
"
same
"
&&
$(i
+
1
)
==
"
as
"
){
sym
=
$(i
+
2
)
sub
(/
,
/,
"
"
,sym)
op
[
name
]
=
tk
[
sym
]
used
[
op
[
name
]]
=
1
sameas
[
op
[
name
]]
=
sym
}
x
=
$i
sub
(
"
,
"
,
"
"
,x)
if
(x
==
"
jump
"
){
jump
[
name
]
=
1
}
else
if
(x
==
"
out2-prerelease
"
){
out2_prerelease
[
name
]
=
1
}
else
if
(x
==
"
in1
"
){
in1
[
name
]
=
1
}
else
if
(x
==
"
in2
"
){
in2
[
name
]
=
1
}
else
if
(x
==
"
in3
"
){
in3
[
name
]
=
1
}
else
if
(x
==
"
out2
"
){
out2
[
name
]
=
1
}
else
if
(x
==
"
out3
"
){
out3
[
name
]
=
1
}
}
order
[
n_op
++
]
=
name;
}
# 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 */
"
op
[
"
OP_Noop
"
]
=
-
1
;
order
[
n_op
++
]
=
"
OP_Noop
"
;
op
[
"
OP_Explain
"
]
=
-
1
;
order
[
n_op
++
]
=
"
OP_Explain
"
;
for
(i
=
0
; i
<
n_op; i
++
){
name
=
order
[
i
]
;
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 bitvectors:
#
# bit 0: jump
# bit 1: pushes a result onto stack
# bit 2: output to p1. release p1 before opcode runs
#
for
(i
=
0
; i
<=
max; i
++
) bv
[
i
]
=
0
;
for
(i
=
0
; i
<
n_op; i
++
){
name
=
order
[
i
]
;
x
=
op
[
name
]
a0
=
a1
=
a2
=
a3
=
a4
=
a5
=
a6
=
a7
=
0
# a7 = a9 = a10 = a11 = a12 = a13 = a14 = a15 = 0
if
( jump
[
name
]
) a0
=
1
;
if
( out2_prerelease
[
name
]
) a1
=
2
;
if
( in1
[
name
]
) a2
=
4
;
if
( in2
[
name
]
) a3
=
8
;
if
( in3
[
name
]
) a4
=
16
;
if
( out2
[
name
]
) a5
=
32
;
if
( out3
[
name
]
) a6
=
64
;
# bv[x] = a0+a1+a2+a3+a4+a5+a6+a7+a8+a9+a10+a11+a12+a13+a14+a15;
bv
[
x
]
=
a0
+
a1
+
a2
+
a3
+
a4
+
a5
+
a6
+
a7;
}
print
"
\n
"
print
"
/* Properties such as
\"
out2
\"
or
\"
jump
\"
that are specified in
"
print
"
** comments following the
\"
case
\"
for each opcode in the vdbe.c
"
print
"
** are encoded into bitvectors as follows:
"
print
"
*/
"
print
"
#define OPFLG_JUMP 0x0001 /* jump: P2 holds jmp target */
"
print
"
#define OPFLG_OUT2_PRERELEASE 0x0002 /* out2-prerelease: */
"
print
"
#define OPFLG_IN1 0x0004 /* in1: P1 is an input */
"
print
"
#define OPFLG_IN2 0x0008 /* in2: P2 is an input */
"
print
"
#define OPFLG_IN3 0x0010 /* in3: P3 is an input */
"
print
"
#define OPFLG_OUT2 0x0020 /* out2: P2 is an output */
"
print
"
#define OPFLG_OUT3 0x0040 /* out3: P3 is an output */
"
print
"
#define OPFLG_INITIALIZER {
\\
"
for
(i
=
0
; i
<=
max; i
++
){
if
( i
%
8
==
0
)
printf
(
"
/* %3d */
"
,i)
printf
"
0x%02x,
"
, bv
[
i
]
if
( i
%
8
==
7
)
printf
(
"
\\\n
"
);
}
print
"
}
"
}
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