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Charles G. Waldman <cgw@fnal.gov>:

Browse source 
Add the EXTENDED_ARG opcode to the virtual machine, allowing 32-bit
arguments to opcodes instead of being forced to stick to the 16-bit
limit.  This is especially useful for machine-generated code, which
can be too long for the SET_LINENO parameter to fit into 16 bits.

This closes the implementation portion of SourceForge patch #100893.
This commit is contained in:
Fred Drake 2000-08-24 00:32:09 +00:00
parent e266e42c9c
commit ef8ace3a6f
6 changed files with 56 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
Include/node.h
View file

@ -19,8 +19,8 @@ extern "C" {
typedef struct _node {
short n_type;
char *n_str;
short n_lineno;
short n_nchildren;
int n_lineno;
int n_nchildren;
struct _node *n_child;
} node;

3
Include/opcode.h
View file

@ -130,6 +130,9 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#define CALL_FUNCTION_KW 141 /* #args + (#kwargs<<8) */
#define CALL_FUNCTION_VAR_KW 142 /* #args + (#kwargs<<8) */
/* Support for opargs more than 16 bits long */
#define EXTENDED_ARG 143
/* Comparison operator codes (argument to COMPARE_OP) */
enum cmp_op {LT, LE, EQ, NE, GT, GE, IN, NOT_IN, IS, IS_NOT, EXC_MATCH, BAD};

8
Lib/dis.py
View file

@ -56,6 +56,7 @@ def disassemble(co, lasti=-1):
labels = findlabels(code)
n = len(code)
i = 0
extended_arg = 0
while i < n:
c = code[i]
op = ord(c)
@ -68,8 +69,11 @@ def disassemble(co, lasti=-1):
print string.ljust(opname[op], 20),
i = i+1
if op >= HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i+1])*256
oparg = ord(code[i]) + ord(code[i+1])*256 + extended_arg
extended_arg = 0
i = i+2
if op == EXTENDED_ARG:
extended_arg = oparg*65536L
print string.rjust(`oparg`, 5),
if op in hasconst:
print '(' + `co.co_consts[oparg]` + ')',
@ -258,6 +262,8 @@ def jabs_op(name, op):
def_op('CALL_FUNCTION_KW', 141) # #args + (#kwargs << 8)
def_op('CALL_FUNCTION_VAR_KW', 142) # #args + (#kwargs << 8)
def_op('EXTENDED_ARG', 143)
EXTENDED_ARG = 143
def _test():
"""Simple test program to disassemble a file."""

7
Parser/node.c
View file

@ -8,7 +8,12 @@ See the file "Misc/COPYRIGHT" for information on usage and
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
******************************************************************/
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef INT_MAX
#define INT_MAX 2147483647
#endif
/* Parse tree node implementation */
@ -39,7 +44,7 @@ PyNode_AddChild(register node *n1, int type, char *str, int lineno)
register int nch = n1->n_nchildren;
register int nch1 = nch+1;
register node *n;
if (nch == SHRT_MAX || nch < 0)
if (nch == INT_MAX || nch < 0)
return E_OVERFLOW;
if (XXXROUNDUP(nch) < nch1) {
n = n1->n_child;

6
Python/ceval.c
View file

@ -613,6 +613,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
opcode = NEXTOP();
if (HAS_ARG(opcode))
oparg = NEXTARG();
dispatch_opcode:
#ifdef DYNAMIC_EXECUTION_PROFILE
#ifdef DXPAIRS
dxpairs[lastopcode][opcode]++;
@ -1750,6 +1751,11 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
if (x != NULL) continue;
break;
case EXTENDED_ARG:
opcode = NEXTOP();
oparg = oparg<<16 | NEXTARG();
goto dispatch_opcode;
break;
default:
fprintf(stderr,

34
Python/compile.c
View file

@ -36,6 +36,9 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef INT_MAX
#define INT_MAX 2147483647
#endif
/* Three symbols from graminit.h are also defined in Python.h, with
Py_ prefixes to their names. Python.h can't include graminit.h
@ -572,11 +575,17 @@ com_set_lineno(struct compiling *c, int lineno)
static void
com_addoparg(struct compiling *c, int op, int arg)
{
int extended_arg = arg >> 16;
if (op == SET_LINENO) {
com_set_lineno(c, arg);
if (Py_OptimizeFlag)
return;
}
if (extended_arg){
com_addbyte(c, EXTENDED_ARG);
com_addint(c, extended_arg);
arg &= 0xffff;
}
com_addbyte(c, op);
com_addint(c, arg);
}
@ -606,7 +615,14 @@ com_backpatch(struct compiling *c, int anchor)
prev = code[anchor] + (code[anchor+1] << 8);
dist = target - (anchor+2);
code[anchor] = dist & 0xff;
code[anchor+1] = dist >> 8;
dist >>= 8;
code[anchor+1] = dist;
dist >>= 8;
if (dist) {
com_error(c, PyExc_SystemError,
"com_backpatch: offset too large");
break;
}
if (!prev)
break;
anchor -= prev;
@ -3364,6 +3380,7 @@ optimize(struct compiling *c)
break;
if (HAS_ARG(opcode))
oparg = NEXTARG();
dispatch_opcode1:
switch (opcode) {
case STORE_NAME:
case DELETE_NAME:
@ -3374,6 +3391,11 @@ optimize(struct compiling *c)
case EXEC_STMT:
c->c_flags &= ~CO_OPTIMIZED;
break;
case EXTENDED_ARG:
opcode = NEXTOP();
oparg = oparg<<16 | NEXTARG();
goto dispatch_opcode1;
break;
}
}
@ -3389,6 +3411,7 @@ optimize(struct compiling *c)
break;
if (HAS_ARG(opcode))
oparg = NEXTARG();
dispatch_opcode2:
if (opcode == LOAD_NAME ||
opcode == STORE_NAME ||
opcode == DELETE_NAME) {
@ -3403,13 +3426,20 @@ optimize(struct compiling *c)
continue;
}
i = PyInt_AsLong(v);
if (i >> 16) /* too big for 2 bytes */
continue;
switch (opcode) {
case LOAD_NAME: cur_instr[0] = LOAD_FAST; break;
case STORE_NAME: cur_instr[0] = STORE_FAST; break;
case DELETE_NAME: cur_instr[0] = DELETE_FAST; break;
}
cur_instr[1] = i & 0xff;
cur_instr[2] = (i>>8) & 0xff;
cur_instr[2] = i >> 8;
}
if (opcode == EXTENDED_ARG) {
opcode = NEXTOP();
oparg = oparg<<16 | NEXTARG();
goto dispatch_opcode2;
}
}