mirror of https://github.com/cc65/cc65.git
140 lines
5.1 KiB
C
140 lines
5.1 KiB
C
/*****************************************************************************/
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/* */
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/* segment.c */
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/* */
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/* Segment handling for da65 */
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/* */
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/* */
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/* */
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/* (C) 2007-2014, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <string.h>
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/* common */
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#include "addrsize.h"
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#include "xmalloc.h"
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/* da65 */
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#include "attrtab.h"
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#include "segment.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Hash definitions */
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#define HASH_SIZE 53
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/* Segment definition */
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typedef struct Segment Segment;
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struct Segment {
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Segment* NextStart; /* Pointer to next segment */
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unsigned long Start;
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unsigned AddrSize;
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char Name[1]; /* Name, dynamically allocated */
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};
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/* Table containing the segments. A segment is inserted using its hash
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** value. Collisions are handled by single-linked lists.
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*/
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static Segment* StartTab[HASH_SIZE]; /* Table containing segment starts */
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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void AddAbsSegment (unsigned Start, unsigned End, const char* Name)
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/* Add an absolute segment to the segment table */
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{
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/* Get the length of the name */
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unsigned Len = strlen (Name);
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/* Create a new segment */
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Segment* S = xmalloc (sizeof (Segment) + Len);
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/* Fill in the data */
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S->Start = Start;
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S->AddrSize = ADDR_SIZE_ABS;
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memcpy (S->Name, Name, Len + 1);
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/* Insert the segment into the hash table */
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S->NextStart = StartTab[Start % HASH_SIZE];
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StartTab[Start % HASH_SIZE] = S;
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/* Mark start and end of the segment */
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MarkAddr (Start, atSegmentStart);
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MarkAddr (End, atSegmentEnd);
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/* Mark the addresses within the segment */
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MarkRange (Start, End, atSegment);
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}
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char* GetSegmentStartName (unsigned Addr)
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/* Return the name of the segment which starts at the given address */
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{
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Segment* S = StartTab[Addr % HASH_SIZE];
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/* Search the collision list for the exact address */
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while (S != 0) {
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if (S->Start == Addr) {
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return S->Name;
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}
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S = S->NextStart;
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}
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return 0;
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}
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unsigned GetSegmentAddrSize (unsigned Addr)
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/* Return the address size of the segment which starts at the given address */
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{
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Segment* S = StartTab[Addr % HASH_SIZE];
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/* Search the collision list for the exact address */
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while (S != 0) {
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if (S->Start == Addr) {
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return S->AddrSize;
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}
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S = S->NextStart;
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}
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return 0;
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}
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