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annotate src/pragma.c @ 25:3b818f05dc2a
imported instruction table from older version to development version
| author | lost |
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| date | Fri, 02 Jan 2009 02:03:48 +0000 |
| parents | 34568fab6058 |
| children | 4b37f17624a7 |
| rev | line source |
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| 0 | 1 /* |
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2 pragma.c |
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3 Copyright © 2008 William Astle |
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4 |
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5 This file is part of LWASM. |
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6 |
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7 LWASM is free software: you can redistribute it and/or modify it under the |
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8 terms of the GNU General Public License as published by the Free Software |
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9 Foundation, either version 3 of the License, or (at your option) any later |
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10 version. |
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11 |
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12 This program is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 more details. |
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16 |
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17 You should have received a copy of the GNU General Public License along with |
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18 this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 |
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21 This file contains stuff associated with lwasm specific strangeness |
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22 */ |
| 0 | 23 |
| 24 #include <ctype.h> | |
| 25 #include <stdlib.h> | |
| 26 #include <string.h> | |
| 27 #include "lwasm.h" | |
| 28 | |
| 29 /* | |
| 30 A pragma is a means of controlling code generation. | |
| 31 | |
| 32 The pseudo op "*pragma" which will be treated as a comment by an assembler | |
| 33 that doesn't recognize it and thus will not cause assembly errors. This is | |
| 34 the preferred way of flagging a pragma if it will not cause incorrect | |
| 35 execution of the program. | |
| 36 | |
| 37 The pseudo op "pragma" which will cause an error on an assembler that does | |
| 38 not understand it. | |
| 39 | |
| 40 In the case of "*pragma", unrecognized pragmas MUST be silently ignored. In | |
| 41 the case of "pragma", unrecognized pragmas should raise an error. | |
| 42 | |
| 43 LWASM understands the following pragmas: | |
| 44 | |
| 45 index0tonone | |
| 46 noindex0tonone | |
| 47 | |
| 48 When set (index0tonone), an expression that evaluates to 0, other than a | |
| 49 bare constant, in a <offset>,r operand will cause the code for ",r" to be | |
| 50 emitted rather than "0,r". If not set (noindex0tonone), the "0,r" output | |
| 51 will be emitted. The default is to perform the optimization. | |
| 52 | |
| 53 This particular optimization will save a cycle for a direct operation. For | |
| 54 an indirect operation, however, it will save several cycles and a program byte | |
| 55 which may be very useful. | |
| 56 */ | |
| 57 | |
| 58 void pseudo_pragma_real(asmstate_t *as, sourceline_t *cl, char **optr, int error) | |
| 59 { | |
| 60 char pragma[128]; | |
| 61 int c = 0; | |
| 62 | |
| 63 while (isspace(**optr)) | |
| 64 (*optr)++; | |
| 65 | |
| 66 while (c < 127 && **optr && !isspace(**optr)) | |
| 67 { | |
| 68 pragma[c++] = **optr; | |
| 69 (*optr)++; | |
| 70 } | |
| 71 | |
| 72 if (c == 0 || (**optr && !isspace(**optr))) | |
| 73 { | |
| 74 if (error) | |
| 75 errorp1(ERR_PRAGMA); | |
| 76 return; | |
| 77 } | |
| 78 pragma[c] = 0; | |
| 79 if (!strcmp(pragma, "noindex0tonone")) | |
| 80 { | |
| 81 as -> pragmas |= PRAGMA_NOINDEX0TONONE; | |
| 82 } | |
| 83 else if (!strcmp(pragma, "index0tonone")) | |
| 84 { | |
| 85 as -> pragmas &= ~PRAGMA_NOINDEX0TONONE; | |
| 86 } | |
| 87 else | |
| 88 { | |
| 89 if (error) | |
| 90 errorp1(ERR_PRAGMA); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 void pseudo_pragma(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 95 { | |
| 96 pseudo_pragma_real(as, cl, optr, 1); | |
| 97 } | |
| 98 | |
| 99 void pseudo_starpragma(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 100 { | |
| 101 pseudo_pragma_real(as, cl, optr, 0); | |
| 102 } |