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annotate lwcc/parse_c.y @ 577:e49d24f4a9a5

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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents a3e277c58df9
children
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1 %include {
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2 #include <assert.h> // only needed due to a bug in lemon
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3 #include <stdio.h>
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4 #include "parse.h"
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5 #include "tree.h"
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6 }
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7
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8 %token_type { struct tokendata * }
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9 %token_prefix PTOK_
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10 %token_destructor { tokendata_free($$); }
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11 %default_type { node_t * }
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12 %extra_argument { struct parserinfo *pinfo }
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13
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14 program(A) ::= rprogram(B). { A = B; pinfo -> parsetree = A; }
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15
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16 rprogram(A) ::= rprogram(C) globaldecl(B). {
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17 A = C;
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18 node_addchild(A, B);
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19 }
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20 rprogram(A) ::= . { A = node_create(NODE_PROGRAM); }
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21
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22 globaldecl(A) ::= vardecl(B). { A = B; }
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23 globaldecl(A) ::= fundecl(B). { A = B; }
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24
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25 vardecl(A) ::= datatype(B) ident(C) ENDS. {
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26 A = node_create(NODE_DECL, B, C);
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27 }
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28
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29 ident(A) ::= IDENTIFIER(B). { A = node_create(NODE_IDENT, B -> strval); }
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30
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31 datatype(A) ::= typename(B). { A = B; }
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32 datatype(A) ::= datatype(B) STAR. { A = node_create(NODE_TYPE_PTR, B); }
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33
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34 typename(A) ::= KW_VOID. { A = node_create(NODE_TYPE_VOID); }
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35 typename(A) ::= KW_FLOAT. { A = node_create(NODE_TYPE_FLOAT); }
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36 typename(A) ::= KW_DOUBLE. { A = node_create(NODE_TYPE_DOUBLE); }
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37 typename(A) ::= KW_LONG KW_DOUBLE. { A = node_create(NODE_TYPE_LDOUBLE); }
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38 typename(A) ::= baseint(B). { A = B; }
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39 typename(A) ::= KW_UNSIGNED. { A = node_create(NODE_TYPE_UINT); }
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40 typename(A) ::= KW_SIGNED. { A = node_create(NODE_TYPE_INT); }
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41 typename(A) ::= KW_SIGNED baseint(B). { A = B; if (A -> type == NODE_TYPE_CHAR) A -> type = NODE_TYPE_SCHAR; }
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42 typename(A) ::= KW_UNSIGNED baseint(B). {
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43 A = B;
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44 switch (A -> type)
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45 {
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46 case NODE_TYPE_CHAR:
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47 A -> type = NODE_TYPE_UCHAR;
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48 break;
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49 case NODE_TYPE_SHORT:
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50 A -> type = NODE_TYPE_USHORT;
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51 break;
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52 case NODE_TYPE_INT:
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53 A -> type = NODE_TYPE_UINT;
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54 break;
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55 case NODE_TYPE_LONG:
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56 A -> type = NODE_TYPE_ULONG;
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57 break;
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58 case NODE_TYPE_LONGLONG:
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59 A -> type = NODE_TYPE_ULONGLONG;
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60 break;
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61 }
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62 }
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64 baseint(A) ::= KW_INT. { A = node_create(NODE_TYPE_INT); }
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65 baseint(A) ::= KW_LONG. { A = node_create(NODE_TYPE_LONG); }
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66 baseint(A) ::= KW_LONG KW_INT. { A = node_create(NODE_TYPE_LONG); }
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67 baseint(A) ::= KW_LONG KW_LONG. { A = node_create(NODE_TYPE_LONGLONG); }
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68 baseint(A) ::= KW_SHORT. { A = node_create(NODE_TYPE_SHORT); }
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69 baseint(A) ::= KW_LONG KW_LONG KW_INT. { A = node_create(NODE_TYPE_LONGLONG); }
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70 baseint(A) ::= KW_SHORT KW_INT. { A = node_create(NODE_TYPE_SHORT); }
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71 baseint(A) ::= KW_CHAR. { A = node_create(NODE_TYPE_CHAR); }
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73
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74 fundecl(A) ::= datatype(B) ident(C) arglist(D) statementblock(E). {
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75 A = node_create(NODE_FUNDEF, B, C, D, E);
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76 }
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77
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78 fundecl(A) ::= datatype(B) ident(C) arglist(D) ENDS. {
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79 A = node_create(NODE_FUNDECL, B, C, D);
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80 }
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81
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82 arglist(A) ::= OPAREN CPAREN. { A = node_create(NODE_FUNARGS); }
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83
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84 statementblock(A) ::= OBRACE CBRACE. { A = node_create(NODE_BLOCK); }
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85
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86 %parse_failure {
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87 fprintf(stderr, "Parse error\n");
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88 }
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89
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90 %stack_overflow {
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91 fprintf(stderr, "Parser stack overflow\n");
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92 }
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93
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94 %syntax_error {
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95 fprintf(stderr, "Undexpected token %d: ", TOKEN -> tokid);
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96 tokendata_print(stderr, TOKEN);
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97 }