ch7mon.c 3.4 KB

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  1. /* $Header$ */
  2. /* SEMANTIC ANALYSIS (CHAPTER 7RM) -- MONADIC OPERATORS */
  3. #include "nobitfield.h"
  4. #include "botch_free.h"
  5. #include "Lpars.h"
  6. #include "arith.h"
  7. #include "type.h"
  8. #include "label.h"
  9. #include "expr.h"
  10. #include "storage.h"
  11. #include "idf.h"
  12. #include "def.h"
  13. extern char options[];
  14. char *symbol2str();
  15. ch7mon(oper, expp)
  16. register struct expr **expp;
  17. {
  18. /* The monadic prefix operator oper is applied to *expp.
  19. */
  20. register struct expr *expr;
  21. switch (oper) {
  22. case '*': /* RM 7.2 */
  23. /* no FIELD type allowed */
  24. if ((*expp)->ex_type->tp_fund == ARRAY)
  25. array2pointer(expp);
  26. if ((*expp)->ex_type->tp_fund != POINTER) {
  27. expr_error(*expp,
  28. "* applied to non-pointer (%s)",
  29. symbol2str((*expp)->ex_type->tp_fund));
  30. }
  31. else {
  32. expr = *expp;
  33. if (expr->ex_lvalue == 0)
  34. /* dereference in administration only */
  35. expr->ex_type = expr->ex_type->tp_up;
  36. else /* runtime code */
  37. *expp = new_oper(expr->ex_type->tp_up, NILEXPR,
  38. '*', expr);
  39. (*expp)->ex_lvalue = (
  40. (*expp)->ex_type->tp_fund != ARRAY &&
  41. (*expp)->ex_type->tp_fund != FUNCTION);
  42. }
  43. break;
  44. case '&':
  45. if ((*expp)->ex_type->tp_fund == ARRAY) {
  46. warning("& before array: ignored");
  47. array2pointer(expp);
  48. }
  49. else
  50. if ((*expp)->ex_type->tp_fund == FUNCTION) {
  51. warning("& before function: ignored");
  52. function2pointer(expp);
  53. }
  54. else
  55. #ifndef NOBITFIELD
  56. if ((*expp)->ex_type->tp_fund == FIELD)
  57. expr_error(*expp, "& applied to field variable");
  58. else
  59. #endif NOBITFIELD
  60. if (!(*expp)->ex_lvalue)
  61. expr_error(*expp, "& applied to non-lvalue");
  62. else {
  63. /* assume that enums are already filtered out */
  64. if ( (*expp)->ex_class == Value
  65. && (*expp)->VL_CLASS == Name
  66. ) {
  67. register struct def *def =
  68. (*expp)->VL_IDF->id_def;
  69. /* &<var> indicates that <var>
  70. cannot be used as register
  71. anymore
  72. */
  73. if (def->df_sc == REGISTER) {
  74. expr_error(*expp,
  75. "& on register variable not allowed");
  76. break; /* break case '&' */
  77. }
  78. def->df_register = REG_NONE;
  79. }
  80. (*expp)->ex_type = pointer_to((*expp)->ex_type);
  81. (*expp)->ex_lvalue = 0;
  82. }
  83. break;
  84. case '~':
  85. {
  86. int fund = (*expp)->ex_type->tp_fund;
  87. if (fund == FLOAT || fund == DOUBLE) {
  88. expr_error(
  89. *expp,
  90. "~ not allowed on %s operands",
  91. symbol2str(fund)
  92. );
  93. erroneous2int(expp);
  94. break;
  95. }
  96. /* FALL THROUGH */
  97. }
  98. case '-':
  99. any2arith(expp, oper);
  100. if (is_cp_cst(*expp)) {
  101. arith o1 = (*expp)->VL_VALUE;
  102. (*expp)->VL_VALUE = (oper == '-') ? -o1 : ~o1;
  103. }
  104. else
  105. if (is_fp_cst(*expp))
  106. switch_sign_fp(*expp);
  107. else
  108. *expp = new_oper((*expp)->ex_type,
  109. NILEXPR, oper, *expp);
  110. break;
  111. case '!':
  112. if ((*expp)->ex_type->tp_fund == FUNCTION)
  113. function2pointer(expp);
  114. if ((*expp)->ex_type->tp_fund != POINTER)
  115. any2arith(expp, oper);
  116. opnd2test(expp, '!');
  117. if (is_cp_cst(*expp)) {
  118. (*expp)->VL_VALUE = !((*expp)->VL_VALUE);
  119. (*expp)->ex_type = int_type; /* a cast ???(EB) */
  120. }
  121. else
  122. *expp = new_oper(int_type, NILEXPR, oper, *expp);
  123. (*expp)->ex_flags |= EX_LOGICAL;
  124. break;
  125. case PLUSPLUS:
  126. case MINMIN:
  127. ch7incr(expp, oper);
  128. break;
  129. case SIZEOF:
  130. if ( (*expp)->ex_class == Value
  131. && (*expp)->VL_CLASS == Name
  132. && (*expp)->VL_IDF->id_def->df_formal_array
  133. )
  134. warning("sizeof formal array %s is sizeof pointer!",
  135. (*expp)->VL_IDF->id_text);
  136. expr = intexpr(size_of_type((*expp)->ex_type, "object"), INT);
  137. free_expression(*expp);
  138. *expp = expr;
  139. (*expp)->ex_flags |= EX_SIZEOF;
  140. break;
  141. }
  142. }