ch7mon.c 3.3 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. array2pointer(expp);
  47. }
  48. else
  49. if ((*expp)->ex_type->tp_fund == FUNCTION) {
  50. function2pointer(expp);
  51. }
  52. else
  53. #ifndef NOBITFIELD
  54. if ((*expp)->ex_type->tp_fund == FIELD) {
  55. expr_error(*expp, "& applied to field variable");
  56. }
  57. else
  58. #endif NOBITFIELD
  59. if (!(*expp)->ex_lvalue) {
  60. expr_error(*expp, "& applied to non-lvalue");
  61. }
  62. else {
  63. /* assume that enums are already filtered out */
  64. if ((*expp)->ex_class == Value && (*expp)->VL_IDF) {
  65. register struct def *def =
  66. (*expp)->VL_IDF->id_def;
  67. /* &<var> indicates that <var> cannot
  68. be used as register anymore
  69. */
  70. if (def->df_sc == REGISTER) {
  71. expr_error(*expp,
  72. "& on register variable not allowed");
  73. break; /* break case '&' */
  74. }
  75. def->df_register = REG_NONE;
  76. }
  77. (*expp)->ex_type = pointer_to((*expp)->ex_type);
  78. (*expp)->ex_lvalue = 0;
  79. }
  80. break;
  81. case '~':
  82. {
  83. int fund = (*expp)->ex_type->tp_fund;
  84. if (fund == FLOAT || fund == DOUBLE) {
  85. expr_error(*expp, "~ not allowed on %s operands",
  86. symbol2str(fund));
  87. erroneous2int(expp);
  88. break;
  89. }
  90. }
  91. case '-':
  92. any2arith(expp, oper);
  93. if (is_cp_cst(*expp)) {
  94. arith o1 = (*expp)->VL_VALUE;
  95. if (oper == '-')
  96. o1 = -o1;
  97. else
  98. o1 = ~o1;
  99. (*expp)->VL_VALUE = o1;
  100. }
  101. else
  102. if (is_fp_cst(*expp))
  103. switch_sign_fp(*expp);
  104. else
  105. *expp = new_oper((*expp)->ex_type,
  106. NILEXPR, oper, *expp);
  107. break;
  108. case '!':
  109. if ((*expp)->ex_type->tp_fund == FUNCTION)
  110. function2pointer(expp);
  111. if ((*expp)->ex_type->tp_fund != POINTER)
  112. any2arith(expp, oper);
  113. opnd2test(expp, '!');
  114. if (is_cp_cst(*expp)) {
  115. arith o1 = (*expp)->VL_VALUE;
  116. o1 = !o1;
  117. (*expp)->VL_VALUE = o1;
  118. (*expp)->ex_type = int_type;
  119. }
  120. else
  121. *expp = new_oper(int_type, NILEXPR, oper, *expp);
  122. (*expp)->ex_flags |= EX_LOGICAL;
  123. break;
  124. case PLUSPLUS:
  125. case MINMIN:
  126. ch7incr(expp, oper);
  127. break;
  128. case SIZEOF:
  129. if ( (*expp)->ex_class == Value
  130. && (*expp)->VL_IDF
  131. && (*expp)->VL_IDF->id_def->df_formal_array
  132. )
  133. warning("sizeof formal array %s is sizeof pointer!",
  134. (*expp)->VL_IDF->id_text);
  135. expr = intexpr(size_of_type((*expp)->ex_type, "object"), INT);
  136. free_expression(*expp);
  137. *expp = expr;
  138. (*expp)->ex_flags |= EX_SIZEOF;
  139. break;
  140. }
  141. }