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/***********************************************************************
*
* Byte Code interpreter declarations.
*
* $Revision: 1.3 $
* $Date: 1995/07/18 06:25:59 $
* $Author: sbb $
*
***********************************************************************/
/***********************************************************************
*
* Copyright (C) 1990, 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
* Written by Steve Byrne.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 1, or (at your option) any later
* version.
*
* GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
***********************************************************************/
/*
* Change Log
* ============================================================================
* Author Date Change
* sbb 23 Jun 95 Switched to GST header guard prefix.
*
* sbb 30 May 95 Boolean => mst_Boolean.
*
* sbb 20 Jan 95 Added padding for 64bit architectures.
*
* sbb 16 Oct 93 Changed to have 9 priority levels, as part of the fix
* for ProcessorScheduler>>yield.
*
* sbb 10 Oct 93 Fixed definition of initProcessSystem.
*
* sbb 24 Nov 91 Context size increased to 64 (still not enough), to
* prevent inadvertent stomping of memory past the end
* of the stack.
*
* sbb 14 Sep 91 Increased number of literals to 256, number of
* temporaries to 64, and number of allowable primitives
* to 1024 (overkill?)
*
* sbyrne 7 Jan 89 Created.
*
*/
#ifndef __GSTINTERP__
#define __GSTINTERP__
#define CONTEXT_STACK_SIZE 64 /* words/OOPS in a context */
#define NUM_PRIORITIES 9
/* These next three defines are the number of bits in a method header for
the number of literals, the number of temporaries, and the number of
arguments that the method takes. If the representation is changed, these
definitions need to be altered too */
#define NUM_LITERALS_BITS 6 /* byte codes limit this */
#define NUM_TEMPS_BITS 6
#define NUM_ARGS_BITS 5
#define NUM_PRIM_BITS 10
#define MAX_NUM_LITERALS ((1 << NUM_LITERALS_BITS) - 1)
#define MAX_NUM_TEMPS ((1 << NUM_TEMPS_BITS) - 1)
#define MAX_NUM_ARGS ((1 << NUM_ARGS_BITS) - 1)
/*
This is the organization of a method header. The 1 bit in the high end of
the word indicates that this is an integer, so that the GC won't be tempted
to try to scan the contents of this field, and so we can do bitwise operations
on this value to extract component pieces.
### no longer valid
!!! make sure this is up to date -- think about what wants to be cheap to
access and make that thing byte aligned.
3 2 1
1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|.|.| prim index | #temps | #literals |flg| #args |1| new
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|.|.|.|.|.|flg| prim index | #args | #temps | #literals | old
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
each of args temps literals and flags could have another bit
literals 6 0..5
temporarycount 5 6..10
args 5 11..15
largeContext?
primitiveIndex 8 16..23
flags 2 24-25
flags 0 -- use arguments as they are, ignore prim index
flags 1 -- return self
flags 2 -- return instance variable
flags 3 -- call the primitive indexed by primIndex
*/
typedef struct MethodHeaderStruct {
#ifdef WORDS_BIGENDIAN
#ifdef LONG_PAD_BIT_FIELDS
unsigned dummy : 32; /* unused */
#endif
unsigned : 2; /* unused */
unsigned primitiveIndex : NUM_PRIM_BITS; /* index of primitve, or 0 */
unsigned numTemps : NUM_TEMPS_BITS;
unsigned numLiterals : NUM_LITERALS_BITS;
unsigned headerFlag : 2; /* numargs, prim self, etc. */
unsigned numArgs : NUM_ARGS_BITS;
unsigned intMark : 1; /* flag this as an Int */
#else
unsigned intMark : 1; /* flag this as an Int */
unsigned numArgs : NUM_ARGS_BITS;
unsigned headerFlag : 2; /* numargs, prim self, etc. */
unsigned numLiterals : NUM_LITERALS_BITS;
unsigned numTemps : NUM_TEMPS_BITS;
unsigned primitiveIndex : NUM_PRIM_BITS; /* index of primitve, or 0 */
unsigned : 2; /* unused */
#ifdef LONG_PAD_BIT_FIELDS
unsigned dummy : 32; /* unused */
#endif
#endif /* WORDS_BIGENDIAN */
} MethodHeader;
extern long byteCodeCounter;
extern mst_Boolean executionTracing;
extern mst_Boolean makeCoreFile;
extern mst_Boolean nonInteractive;
extern OOP methodLiteralExt(),
finishExecutionEnvironment();
extern void interpret(), sendMessage(), initInterpreter(),
prepareExecutionEnvironment(),
storeMethodLiteralExt(), setFileStreamFile(),
updateMethodCache(), initSignals(),
storeMethodLiteralNoGC(),
realizeMethodContexts(),
initProcessSystem(), restoreObjectPointers(),
markProcessorRegisters();
extern mst_Boolean equal();
extern long hash();
extern MethodHeader getMethodHeaderExt();
#endif /* __GSTINTERP__ */
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