smatch_expressions.c

   1 #include "smatch.h"
   2
   3 static struct position pos;
   4
   5 struct expression *zero_expr()
   6 {
   7         static struct expression *zero;
   8
   9         if (zero)
  10                 return zero;
  11
  12         zero = alloc_expression(pos, EXPR_VALUE);
  13         zero->value = 0;
  14         return zero;
  15 }
  16
  17 struct expression *value_expr(long long val)
  18 {
  19         struct expression *expr;
  20
  21         if (!val)
  22                 return zero_expr();
  23
  24         expr = alloc_expression(pos, EXPR_VALUE);
  25         expr->value = val;
  26         return expr;
  27 }
  28
  29 struct expression *member_expression(struct expression *deref, int op, struct ident *member)
  30 {
  31         struct expression *expr;
  32
  33         expr = alloc_expression(deref->pos, EXPR_DEREF);
  34         expr->op = op;
  35         expr->deref = deref;
  36         expr->member = member;
  37         return expr;
  38 }
  39
  40 struct expression *deref_expression(struct expression *expr)
  41 {
  42         struct expression *preop;
  43
  44         preop = alloc_expression(expr->pos, EXPR_PREOP);
  45         preop->unop = expr;
  46         preop->op = '*';
  47         return preop;
  48 }
  49
  50 struct expression *assign_expression(struct expression *left, struct expression *right)
  51 {
  52         struct expression *expr;
  53
  54         expr = alloc_expression(right->pos, EXPR_ASSIGNMENT);
  55         expr->op = '=';
  56         expr->left = left;
  57         expr->right = right;
  58         return expr;
  59 }
  60
  61 struct expression *binop_expression(struct expression *left, int op, struct expression *right)
  62 {
  63         struct expression *expr;
  64
  65         expr = alloc_expression(right->pos, EXPR_BINOP);
  66         expr->op = op;
  67         expr->left = left;
  68         expr->right = right;
  69         return expr;
  70 }
  71
  72 struct expression *symbol_expression(struct symbol *sym)
  73 {
  74         struct expression *expr;
  75
  76         expr = alloc_expression(sym->pos, EXPR_SYMBOL);
  77         expr->symbol = sym;
  78         expr->symbol_name = sym->ident;
  79         return expr;
  80 }