/*****************************************************************************/
/*                                                                           */
/*                                segments.h                                 */
/*                                                                           */
/*                   Segment handling for the ld65 linker                    */
/*                                                                           */
/*                                                                           */
/*                                                                           */
/* (C) 1998-2012, Ullrich von Bassewitz                                      */
/*                Roemerstrasse 52                                           */
/*                D-70794 Filderstadt                                        */
/* EMail:         uz@cc65.org                                                */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
/*                                                                           */
/*****************************************************************************/



#ifndef SEGMENTS_H
#define SEGMENTS_H



#include <stdio.h>

/* common */
#include "coll.h"
#include "exprdefs.h"



/*****************************************************************************/
/*                                   Data                                    */
/*****************************************************************************/



/* Forwards */
struct MemoryArea;

/* Segment structure */
typedef struct Segment Segment;
struct Segment {
    unsigned            Name;           /* Name index of the segment */
    unsigned            Id;             /* Segment id for debug info */
    Segment*            Next;           /* Hash list */
    unsigned            Flags;          /* Segment flags */
    Collection          Sections;       /* Sections in this segment */
    struct MemoryArea*  MemArea;        /* Run memory area once placed */
    unsigned long       PC;             /* PC were this segment is located */
    unsigned long       Size;           /* Size of data so far */
    const char*         OutputName;     /* Name of output file or NULL */
    unsigned long       OutputOffs;     /* Offset in output file */
    unsigned long       Alignment;      /* Alignment needed */
    unsigned char       FillVal;        /* Value to use for fill bytes */
    unsigned char       AddrSize;       /* Address size of segment */
    unsigned char       ReadOnly;       /* True for readonly segments (config) */
    unsigned char       Dumped;         /* Did we dump this segment? */
};



/* Section structure (a section is a part of a segment) */
typedef struct Section Section;
struct Section {
    Section*            Next;           /* List of sections in a segment */
    Segment*            Seg;            /* Segment that contains the section */
    struct ObjData*     Obj;            /* Object file this section comes from */
    struct Fragment*    FragRoot;       /* Fragment list */
    struct Fragment*    FragLast;       /* Pointer to last fragment */
    unsigned long       Offs;           /* Offset into the segment */
    unsigned long       Size;           /* Size of the section */
    unsigned long       Fill;           /* Fill bytes for alignment */
    unsigned long       Alignment;      /* Alignment */
    unsigned char       AddrSize;       /* Address size of segment */
};



/* Prototype for a function that is used to write expressions to the target
 * file (used in SegWrite). It returns one of the following values:
 */
#define SEG_EXPR_OK             0U      /* Ok */
#define SEG_EXPR_RANGE_ERROR    1U      /* Range error */
#define SEG_EXPR_TOO_COMPLEX    2U      /* Expression too complex */
#define SEG_EXPR_INVALID        3U      /* Expression is invalid (e.g. unmapped segment) */

typedef unsigned (*SegWriteFunc) (ExprNode* E,        /* The expression to write */
                                  int Signed,         /* Signed expression? */
                                  unsigned Size,      /* Size (=range) */
                                  unsigned long Offs, /* File offset */
                                  void* Data);        /* Callers data */



/*****************************************************************************/
/*                                   Code                                    */
/*****************************************************************************/



Segment* GetSegment (unsigned Name, unsigned char AddrSize, const char* ObjName);
/* Search for a segment and return an existing one. If the segment does not
 * exist, create a new one and return that. ObjName is only used for the error
 * message and may be NULL if the segment is linker generated.
 */

Section* NewSection (Segment* Seg, unsigned long Alignment, unsigned char AddrSize);
/* Create a new section for the given segment */

Section* ReadSection (FILE* F, struct ObjData* O);
/* Read a section from a file */

Segment* SegFind (unsigned Name);
/* Return the given segment or NULL if not found. */

int IsBSSType (Segment* S);
/* Check if the given segment is a BSS style segment, that is, it does not
 * contain non-zero data.
 */

void SegDump (void);
/* Dump the segments and it's contents */

unsigned SegWriteConstExpr (FILE* F, ExprNode* E, int Signed, unsigned Size);
/* Write a supposedly constant expression to the target file. Do a range
 * check and return one of the SEG_EXPR_xxx codes.
 */

void SegWrite (const char* TgtName, FILE* Tgt, Segment* S, SegWriteFunc F, void* Data);
/* Write the data from the given segment to a file. For expressions, F is
 * called (see description of SegWriteFunc above).
 */

unsigned SegmentCount (void);
/* Return the total number of segments */

void PrintSegmentMap (FILE* F);
/* Print a segment map to the given file */

void PrintDbgSegments (FILE* F);
/* Output the segments to the debug file */

void CheckSegments (void);
/* Walk through the segment list and check if there are segments that were
 * not written to the output file. Output an error if this is the case.
 */



/* End of segments.h */

#endif




