1 /*****************************************************************************/
5 /* Pragma handling for the cc65 C compiler */
9 /* (C) 1998-2002 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@cc65.org */
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. */
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: */
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 */
32 /*****************************************************************************/
49 #include "scanstrbuf.h"
56 /*****************************************************************************/
58 /*****************************************************************************/
62 /* Tokens for the #pragmas */
79 static const struct Pragma {
80 const char* Key; /* Keyword */
81 pragma_t Tok; /* Token */
82 } Pragmas[PR_COUNT] = {
83 { "bssseg", PR_BSSSEG },
84 { "charmap", PR_CHARMAP },
85 { "checkstack", PR_CHECKSTACK },
86 { "codeseg", PR_CODESEG },
87 { "dataseg", PR_DATASEG },
88 { "regvaraddr", PR_REGVARADDR },
89 { "rodataseg", PR_RODATASEG },
90 { "signedchars", PR_SIGNEDCHARS },
91 { "staticlocals", PR_STATICLOCALS },
92 { "zpsym", PR_ZPSYM },
97 /*****************************************************************************/
99 /*****************************************************************************/
103 static void PragmaErrorSkip (void)
104 /* Called in case of an error, skips tokens until the closing paren or a
105 * semicolon is reached.
108 static const token_t TokenList[] = { TOK_RPAREN, TOK_SEMI };
109 SkipTokens (TokenList, sizeof(TokenList) / sizeof(TokenList[0]));
114 static int CmpKey (const void* Key, const void* Elem)
115 /* Compare function for bsearch */
117 return strcmp ((const char*) Key, ((const struct Pragma*) Elem)->Key);
122 static pragma_t FindPragma (const char* Key)
123 /* Find a pragma and return the token. Return PR_ILLEGAL if the keyword is
124 * not a valid pragma.
128 P = bsearch (Key, Pragmas, PR_COUNT, sizeof (Pragmas[0]), CmpKey);
129 return P? P->Tok : PR_ILLEGAL;
134 static void StringPragma (StrBuf* B, void (*Func) (const char*))
135 /* Handle a pragma that expects a string parameter */
139 /* We expect a string here */
140 if (SB_GetString (B, &S)) {
141 /* Call the given function with the string argument */
142 Func (SB_GetConstBuf (&S));
144 Error ("String literal expected");
147 /* Call the string buf destructor */
153 static void SegNamePragma (StrBuf* B, segment_t Seg)
154 /* Handle a pragma that expects a segment name parameter */
158 if (SB_GetString (B, &S)) {
161 const char* Name = SB_GetConstBuf (&S);
163 /* Check if the name is valid */
164 if (ValidSegName (Name)) {
166 /* Set the new name */
167 g_segname (Seg, Name);
171 /* Segment name is invalid */
172 Error ("Illegal segment name: `%s'", Name);
177 Error ("String literal expected");
180 /* Call the string buf destructor */
186 static void CharMapPragma (StrBuf* B)
187 /* Change the character map */
191 /* Read the character index */
192 if (!SB_GetNumber (B, &Index)) {
195 if (Index < 1 || Index > 255) {
196 Error ("Character index out of range");
202 if (SB_Get (B) != ',') {
203 Error ("Comma expected");
208 /* Read the character code */
209 if (!SB_GetNumber (B, &C)) {
212 if (C < 1 || C > 255) {
213 Error ("Character code out of range");
217 /* Remap the character */
218 TgtTranslateSet ((unsigned) Index, (unsigned char) C);
223 static void FlagPragma (StrBuf* B, unsigned char* Flag)
224 /* Handle a pragma that expects a boolean paramater */
229 if (SB_GetSym (B, Ident)) {
230 if (strcmp (Ident, "true") == 0 || strcmp (Ident, "on") == 0) {
232 } else if (strcmp (Ident, "false") == 0 || strcmp (Ident, "off") == 0) {
235 Error ("Pragma argument must be one of `on', `off', `true' or `false'");
237 } else if (SB_GetNumber (B, &Val)) {
240 Error ("Invalid pragma argument");
246 static void ParsePragma (void)
247 /* Parse the contents of the _Pragma statement */
252 /* Create a string buffer from the string literal */
253 StrBuf B = AUTO_STRBUF_INITIALIZER;
254 GetLiteralStrBuf (&B, CurTok.IVal);
256 /* Reset the string pointer, effectivly clearing the string from the
257 * string table. Since we're working with one token lookahead, this
258 * will fail if the next token is also a string token, but that's a
259 * syntax error anyway, because we expect a right paren.
261 ResetLiteralPoolOffs (CurTok.IVal);
263 /* Skip the string token */
266 /* Get the pragma name from the string */
268 if (!SB_GetSym (&B, Ident)) {
269 Error ("Invalid pragma");
273 /* Search for the name */
274 Pragma = FindPragma (Ident);
276 /* Do we know this pragma? */
277 if (Pragma == PR_ILLEGAL) {
278 /* According to the ANSI standard, we're not allowed to generate errors
279 * for unknown pragmas, however, we're allowed to warn - and we will
280 * do so. Otherwise one typo may give you hours of bug hunting...
282 Warning ("Unknown pragma `%s'", Ident);
286 /* Check for an open paren */
288 if (SB_Get (&B) != '(') {
289 Error ("'(' expected");
293 /* Skip white space before the argument */
296 /* Switch for the different pragmas */
300 SegNamePragma (&B, SEG_BSS);
308 FlagPragma (&B, &CheckStack);
312 SegNamePragma (&B, SEG_CODE);
316 SegNamePragma (&B, SEG_DATA);
320 FlagPragma (&B, &AllowRegVarAddr);
324 SegNamePragma (&B, SEG_RODATA);
328 FlagPragma (&B, &SignedChars);
331 case PR_STATICLOCALS:
332 FlagPragma (&B, &StaticLocals);
336 StringPragma (&B, MakeZPSym);
340 Internal ("Invalid pragma");
343 /* Closing paren expected */
345 if (SB_Get (&B) != ')') {
346 Error ("')' expected");
351 /* Allow an optional semicolon to be compatible with the old syntax */
352 if (SB_Peek (&B) == ';') {
357 /* Make sure nothing follows */
358 if (SB_Peek (&B) != '\0') {
359 Error ("Unexpected input following pragma directive");
362 /* Release the StrBuf */
369 /* Handle pragmas. These come always in form of the new C99 _Pragma() operator. */
371 /* Skip the token itself */
374 /* We expect an opening paren */
375 if (!ConsumeLParen ()) {
380 if (CurTok.Tok != TOK_SCONST) {
382 /* Print a diagnostic */
383 Error ("String literal expected");
385 /* Try some smart error recovery: Skip tokens until we reach the
386 * enclosing paren, or a semicolon.
392 /* Parse the _Pragma statement */
396 /* Closing paren needed */