git.sur5r.net Git - cc65/blob - src/ca65/asserts.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 asserts.c                                 */
   4 /*                                                                           */
   5 /*               Linker assertions for the ca65 crossassembler               */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2003-2008, Ullrich von Bassewitz                                      */
  10 /*                Roemerstrasse 52                                           */
  11 /*                D-70794 Filderstadt                                        */
  12 /* EMail:         uz@cc65.org                                                */
  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 /* common */
  37 #include "coll.h"
  38 #include "xmalloc.h"
  39
  40 /* ca65 */
  41 #include "asserts.h"
  42 #include "error.h"
  43 #include "expr.h"
  44 #include "objfile.h"
  45 #include "scanner.h"
  46 #include "spool.h"
  47
  48
  49
  50 /*****************************************************************************/
  51 /*                                   Data                                    */
  52 /*****************************************************************************/
  53
  54
  55
  56 /* An assertion entry */
  57 typedef struct Assertion Assertion;
  58 struct Assertion {
  59     ExprNode*       Expr;       /* Expression to evaluate */
  60     AssertAction    Action;     /* Action to take */
  61     unsigned        Msg;        /* Message to print (if any) */
  62     FilePos         Pos;        /* File position of assertion */
  63 };
  64
  65 /* Collection with all assertions for a module */
  66 static Collection Assertions = STATIC_COLLECTION_INITIALIZER;
  67
  68
  69
  70 /*****************************************************************************/
  71 /*                                   Code                                    */
  72 /*****************************************************************************/
  73
  74
  75
  76 static Assertion* NewAssertion (ExprNode* Expr, AssertAction Action, unsigned Msg)
  77 /* Create a new Assertion struct and return it */
  78 {
  79     /* Allocate memory */
  80     Assertion* A = xmalloc (sizeof (Assertion));
  81
  82     /* Initialize the fields */
  83     A->Expr     = Expr;
  84     A->Action   = Action;
  85     A->Msg      = Msg;
  86     A->Pos      = CurPos;
  87
  88     /* Return the new struct */
  89     return A;
  90 }
  91
  92
  93
  94 void AddAssertion (ExprNode* Expr, AssertAction Action, unsigned Msg)
  95 /* Add an assertion to the assertion table */
  96 {
  97     /* Add an assertion object to the table */
  98     CollAppend (&Assertions, NewAssertion (Expr, Action, Msg));
  99 }
 100
 101
 102
 103 void CheckAssertions (void)
 104 /* Check all assertions and evaluate the ones we can evaluate here. */
 105 {
 106     unsigned I;
 107
 108     /* Get the number of assertions */
 109     unsigned Count = CollCount (&Assertions);
 110
 111     /* Check the assertions */
 112     for (I = 0; I < Count; ++I) {
 113
 114         long Val;
 115
 116         /* Get the next assertion */
 117         Assertion* A = CollAtUnchecked (&Assertions, I);
 118
 119         /* Ignore it, if it should only be evaluated by the linker */
 120         if (!AssertAtAsmTime (A->Action)) {
 121             continue;
 122         }
 123
 124         /* Can we evaluate the expression? */
 125         if (IsConstExpr (A->Expr, &Val) && Val == 0) {
 126             /* Apply the action */
 127             const char* Msg = GetString (A->Msg);
 128             switch (A->Action) {
 129
 130                 case ASSERT_ACT_WARN:
 131                     PWarning (&A->Pos, 0, "%s", Msg);
 132                     break;
 133
 134                 case ASSERT_ACT_ERROR:
 135                     PError (&A->Pos, "%s", Msg);
 136                     break;
 137
 138                 default:
 139                     Internal ("Illegal assert action specifier");
 140                     break;
 141             }
 142         }
 143     }
 144 }
 145
 146
 147
 148 void WriteAssertions (void)
 149 /* Write the assertion table to the object file */
 150 {
 151     unsigned I;
 152
 153     /* Get the number of assertions */
 154     unsigned Count = CollCount (&Assertions);
 155
 156     /* Tell the object file module that we're about to start the assertions */
 157     ObjStartAssertions ();
 158
 159     /* Write the string count to the list */
 160     ObjWriteVar (Count);
 161
 162     /* Write the assertions */
 163     for (I = 0; I < Count; ++I) {
 164
 165         /* Get the next assertion */
 166         Assertion* A = CollAtUnchecked (&Assertions, I);
 167
 168         /* Write it to the file */
 169         WriteExpr (A->Expr);
 170         ObjWriteVar ((unsigned) A->Action);
 171         ObjWriteVar (A->Msg);
 172         ObjWritePos (&A->Pos);
 173     }
 174
 175     /* Done writing the assertions */
 176     ObjEndAssertions ();
 177 }
 178
 179
 180
 181