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

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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
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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;
}
}