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annotate lwcc/parse_c.y @ 502:14a40f8bb4eb

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Add various operators to lwcc Add various binary and ternary operators to lwcc, but only those which can work with constant operands. Seems like variables are probably required next.
author William Astle <lost@l-w.ca>
date Wed, 25 Sep 2019 20:23:49 -0600
parents a3e277c58df9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a3e277c58df9 Checkpoint parser development for lwcc
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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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63
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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 }