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/*

    		 Crown Copyright (c) 1996

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/*

			    VERSION INFORMATION

			    ===================

--------------------------------------------------------------------------

$Header: /u/g/release/CVSROOT/Source/src/installers/680x0/common/mach_ins.c,v 1.1.1.1 1998/01/17 15:55:49 release Exp $

--------------------------------------------------------------------------

$Log: mach_ins.c,v $

 * Revision 1.1.1.1  1998/01/17  15:55:49  release

 * First version to be checked into rolling release.

 *

Revision 1.4  1997/11/13 08:27:13  ma

All avs test passed (except add_to_ptr).

Revision 1.3  1997/11/10 15:38:06  ma

.

Revision 1.2  1997/11/09 14:13:58  ma

comment.

Revision 1.1.1.1  1997/10/13 12:42:55  ma

First version.

Revision 1.5  1997/10/13 08:49:35  ma

Made all pl_tests for general proc & exception handling pass.

Revision 1.4  1997/06/18 10:09:36  ma

Checking in before merging with Input Baseline changes.

Revision 1.3  1997/05/13 11:30:34  ma

Introduced make_comment for debug.

Revision 1.2  1997/04/20 11:30:31  ma

Introduced gcproc.c & general_proc.[ch].

Added cases for apply_general_proc next to apply_proc in all files.

Revision 1.1.1.1  1997/03/14 07:50:14  ma

Imported from DRA

 * Revision 1.1.1.1  1996/09/20  10:56:55  john

 *

 * Revision 1.2  1996/07/05  14:22:21  john

 * Changes for spec 3.1

 *

 * Revision 1.1.1.1  1996/03/26  15:45:14  john

 *

 * Revision 1.2  94/02/21  15:59:49  15:59:49  ra (Robert Andrews)

 * Add a couple of explicit casts.  Some flags which used to be bool are

 * now int.

 *

 * Revision 1.1  93/02/22  17:16:02  17:16:02  ra (Robert Andrews)

 * Initial revision

 *

--------------------------------------------------------------------------

*/

#include "config.h"

#include "common_types.h"

#include "instrs.h"

#include "mach.h"

#include "mach_ins.h"

#include "mach_op.h"

#include "codex.h"

#include "output.h"

#include "utility.h"

extern bool have_cond ;

#ifdef EBUG

extern bool seek_label ;

extern bool seek_extern ;

extern int seek_label_no ;

extern char *seek_extern_id ;

#endif

/*

    OUTPUT FLAG

    If this is true, all instructions are output immediately.  This

    effectively switches off all peephole optimizations.

*/

int output_immediately = 0 ;

/*

    LIST OF ALL INSTRUCTIONS

    A list of all instructions in maintained.  The current instruction is

    given by current_ins.

*/

mach_ins *all_mach_ins = null ;

mach_ins *current_ins = null ;

/*

    RECORD OF LAST JUMP AND REGISTERS CHANGED SINCE

    This is used to help get a more accurate idea of which registers

    are known during the peephole optimizations.

*/

long last_jump = -1 ;

bitpattern last_jump_regs = 0 ;

/*

    LIST OF FREE INSTRUCTIONS

    A list of free mach_ins's, linked by their next field, is maintained.

*/

static mach_ins *mach_ins_list = null ;

/*

    FREE A SINGLE INSTRUCTION AND ITS OPERANDS

    The operands of the instruction are freed and the instruction

    itself is added to the list of all free instructions.

*/

void reclaim_ins

    PROTO_N ( ( p ) )

    PROTO_T ( mach_ins *p )

{

    if ( p->op1 ) free_mach_op ( p->op1 ) ;

    if ( p->op2 ) free_mach_op ( p->op2 ) ;

    p->next = mach_ins_list ;

    mach_ins_list = p ;

    return ;

}

/*

    FREE ALL INSTRUCTIONS AND THEIR OPERANDS

    All the instructions in the list of all instructions are freed and

    the list is reset to zero length.

*/

void free_all_ins

    PROTO_Z ()

{

    mach_ins *p = all_mach_ins, *q = null ;

    if ( p == null ) return ;

    while ( p != null ) {

	if ( p->op1 ) free_mach_op ( p->op1 ) ;

	if ( p->op2 ) free_mach_op ( p->op2 ) ;

	q = p ;

	p = p->next ;

    }

    q->next = mach_ins_list ;

    mach_ins_list = all_mach_ins ;

    all_mach_ins = null ;

    current_ins = null ;

    last_jump = -1 ;

    last_jump_regs = 0 ;

    return ;

}

/*

    CREATE A NEW INSTRUCTION

    A new instruction, with instruction number insno and operands op1 and

    op2 is added to the list of all instructions.  ch gives the mask of

    all registers changed by the instruction.  If susp is true then

    this instruction is never output immediately.  This only occurs in

    tmp_reg.

    This routine is usual called via the macro make_instr which has the

    same first four arguments, but has susp always false.

*/

#ifdef EBUG

static int next_id = 0 ;

#endif

void make_instr_aux

    PROTO_N ( ( insno, op1, op2, ch, susp ) )

    PROTO_T ( int insno X mach_op *op1 X mach_op *op2 X bitpattern ch X int susp )

{

    mach_ins *p ;

    if (insno != m_comment) {

      if ( stack_change ) update_stack () ;

    }

    if ( mach_ins_list == null ) {

	int i, n = 1000 ;

	mach_ins_list = alloc_nof ( mach_ins, n ) ;

	for ( i = 0 ; i < n - 1 ; i++ ) {

	    ( mach_ins_list + i )->next = mach_ins_list + ( i + 1 ) ;

	}

	( mach_ins_list + ( n - 1 ) )->next = null ;

    }

    p = mach_ins_list ;

    mach_ins_list = p->next ;

#ifdef EBUG

    p->id = ++ next_id ;

#if 1

    if(p->id == 4803) {

       int found = 1 ;

    }

#endif

#endif

    p->ins_no = insno ;

    p->op1 = op1 ;

    p->op2 = op2 ;

    p->changed = ch ;

    last_jump_regs |= ch ;

    if ( current_ins == null ) {

	p->next = all_mach_ins ;

	all_mach_ins = p ;

    } else {

	p->next = current_ins->next ;

	current_ins->next = p ;

    }

    current_ins = p ;

    if ( insno != m_comment ) {

      /* Clear the temporary register status */

      tmp_reg_status = 0 ;

      tmp_reg_prefer = 0 ;

    }

    if ( output_immediately && !susp ) {

	output_all () ;

	free_all_ins () ;

    }

    return ;

}

/*

    CREATE A LABEL

    A label is added to the list of all instructions.  This has the effect

    of marking all registers as changed.

*/

void make_label

    PROTO_N ( ( n ) )

    PROTO_T ( long n )

{

    mach_op *p = new_mach_op () ;

    p->type = MACH_LABQ ;

    p->def.num = n ;

    make_instr_aux ( m_label_ins, p, null, ( bitpattern ) 0xffff, 0 ) ;

    have_cond = 0 ;

#ifdef EBUG

    if ( seek_label && n == ( long ) seek_label_no ) {

	warning ( "Label %ld used", n ) ;

	breakpoint () ;

    }

#endif

    return ;

}

#ifdef EBUG

void make_comment

    PROTO_N ( ( comment ) )

    PROTO_T ( char* comment )

{

    mach_op *p;

    p = new_mach_op () ;

    p->type = MACH_COMMENT ;

    p->def.str = comment ;

    make_instr_aux ( m_comment, p, null, ( bitpattern ) 0x0000, 0 ) ;

    return ;

}

#endif

/*

    CREATE AN EXTERNAL LABEL

    An external label is added to the list of all instructions.  This has

    the effect of marking all registers as changed.

*/

void make_external_label

    PROTO_N ( ( nm ) )

    PROTO_T ( char *nm )

{

    mach_op *p = new_mach_op () ;

    p->type = MACH_EXTQ ;

    p->def.str = nm ;

    make_instr_aux ( m_extern_ins, p, null, ( bitpattern ) 0xffff, 0 ) ;

    have_cond = 0 ;

#ifdef EBUG

    if ( seek_extern && eq ( nm, seek_extern_id ) ) {

	warning ( "Label %s used", nm ) ;

	breakpoint () ;

    }

#endif

    return ;

}

/*

    CREATE A JUMP

    A jump, instruction number insno, to label n, is added to the list

    of all instructions.

*/

void make_jump

    PROTO_N ( ( insno, n ) )

    PROTO_T ( int insno X long n )

{

    mach_op *p = new_mach_op () ;

    p->type = MACH_LABQ ;

    p->def.num = n ;

    make_instr_aux ( insno, p, null, ( bitpattern ) 0, 0 ) ;

    if ( n != last_jump ) {

	last_jump = n ;

	last_jump_regs = 0 ;

    }

    return ;

}

/*

    SET A SPECIAL LABEL VALUE

    The special label with identifier nm is set equal to the given value.

*/

void set_special

    PROTO_N ( ( nm, op ) )

    PROTO_T ( char *nm X mach_op *op )

{

    mach_op *op1 = make_special_data ( nm ) ;

    make_instr_aux ( m_as_assign, op1, op, ( bitpattern ) 0, 0 ) ;

    return ;

}

/*

    OUTPUT AN IDENTIFICATION OF TWO NAMES

    This is not required, since all link information is known by the

    time I get round to code production.

*/

void out_rename

    PROTO_N ( ( old_nm, nm ) )

    PROTO_T ( char *old_nm X char *nm )

{

#if 0

    mach_op *op1 = make_extern_data ( old_nm, 0 ) ;

    mach_op *op2 = make_extern_data ( nm, 0 ) ;

    make_instr_aux ( m_as_assign, op1, op2, 0, 0 ) ;

#endif

    return ;

}