git.sur5r.net Git - cc65/blob - src/cc65/litpool.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 litpool.c                                 */
   4 /*                                                                           */
   5 /*              Literal string handling for the cc65 C compiler              */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998     Ullrich von Bassewitz                                        */
  10 /*              Wacholderweg 14                                              */
  11 /*              D-70597 Stuttgart                                            */
  12 /* EMail:       uz@musoftware.de                                             */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <stdio.h>
  37
  38 /* common */
  39 #include "check.h"
  40 #include "tgttrans.h"
  41 #include "xmalloc.h"
  42
  43 /* cc65 */
  44 #include "asmlabel.h"
  45 #include "codegen.h"
  46 #include "error.h"
  47 #include "global.h"
  48 #include "litpool.h"
  49
  50
  51
  52 /*****************************************************************************/
  53 /*                                   Data                                    */
  54 /*****************************************************************************/
  55
  56
  57
  58 static unsigned char* LiteralPoolBuf    = 0;    /* Pointer to buffer */
  59 static unsigned       LiteralPoolSize   = 0;    /* Size of pool */
  60 static unsigned       LiteralPoolOffs   = 0;    /* Current offset into pool */
  61 unsigned              LiteralPoolLabel  = 0;    /* Pool asm label */
  62
  63
  64
  65 /*****************************************************************************/
  66 /*                                   Code                                    */
  67 /*****************************************************************************/
  68
  69
  70
  71 void InitLiteralPool (void)
  72 /* Initialize the literal pool */
  73 {
  74     /* Get the pool label */
  75     LiteralPoolLabel = GetLabel ();
  76 }
  77
  78
  79
  80 void TranslateLiteralPool (unsigned Offs)
  81 /* Translate the literals starting from the given offset into the target
  82  * charset.
  83  */
  84 {
  85     TgtTranslateBuf (LiteralPoolBuf + Offs, LiteralPoolOffs - Offs);
  86 }
  87
  88
  89
  90 void DumpLiteralPool (void)
  91 /* Dump the literal pool */
  92 {
  93     /* If nothing there, exit... */
  94     if (LiteralPoolOffs == 0) {
  95         return;
  96     }
  97
  98     /* Switch to the data segment */
  99     if (WriteableStrings) {
 100         g_usedata ();
 101     } else {
 102         g_userodata ();
 103     }
 104
 105     /* Define the label */
 106     g_defloclabel (LiteralPoolLabel);
 107
 108     /* Translate the buffer contents into the target charset */
 109     TranslateLiteralPool (0);
 110
 111     /* Output the buffer data */
 112     g_defbytes (LiteralPoolBuf, LiteralPoolOffs);
 113
 114     /* Switch back to the code segment */
 115     g_usecode ();
 116 }
 117
 118
 119
 120 unsigned GetLiteralPoolOffs (void)
 121 /* Return the current offset into the literal pool */
 122 {
 123     return LiteralPoolOffs;
 124 }
 125
 126
 127
 128 void ResetLiteralPoolOffs (unsigned Offs)
 129 /* Reset the offset into the literal pool to some earlier value, effectively
 130  * removing values from the pool.
 131  */
 132 {
 133     CHECK (Offs <= LiteralPoolOffs);
 134     LiteralPoolOffs = Offs;
 135 }
 136
 137
 138
 139 void AddLiteralChar (char C)
 140 /* Add one character to the literal pool */
 141 {
 142     /* Grow the buffer if needed */
 143     if (LiteralPoolOffs >= LiteralPoolSize) {
 144         if (LiteralPoolSize == 0) {
 145             /* First call */
 146             LiteralPoolSize = 256;
 147         } else {
 148             LiteralPoolSize *= 2;
 149         }
 150         LiteralPoolBuf = xrealloc (LiteralPoolBuf, LiteralPoolSize);
 151     }
 152
 153     /* Store the character */
 154     LiteralPoolBuf[LiteralPoolOffs++] = C;
 155 }
 156
 157
 158
 159 unsigned AddLiteral (const char* S)
 160 /* Add a literal string to the literal pool. Return the starting offset into
 161  * the pool
 162  */
 163 {
 164     /* Remember the starting offset */
 165     unsigned Start = LiteralPoolOffs;
 166
 167     /* Copy the string including the terminator growing the buffer if needed */
 168     do {
 169         AddLiteralChar (*S);
 170     } while (*S++);
 171
 172     /* Return the starting offset */
 173     return Start;
 174 }
 175
 176
 177
 178 const char* GetLiteral (unsigned Offs)
 179 /* Get a pointer to the literal with the given offset in the pool */
 180 {
 181     CHECK (Offs < LiteralPoolOffs);
 182     return (const char*) &LiteralPoolBuf[Offs];
 183 }
 184
 185
 186
 187 void PrintLiteralPoolStats (FILE* F)
 188 /* Print statistics about the literal space used */
 189 {
 190     fprintf (F, "Literal space used: %u bytes\n", LiteralPoolOffs);
 191 }
 192
 193
 194