diff options
Diffstat (limited to 'eval.c')
| -rw-r--r-- | eval.c | 94 |
1 files changed, 80 insertions, 14 deletions
@@ -1,24 +1,90 @@ -static bool eval_expr_as_float(Expression *e, FloatLiteral *f) { - switch (e->kind) { - case EXPR_FLOAT_LITERAL: - *f = e->floatl; - return true; - case EXPR_INT_LITERAL: - *f = (FloatLiteral)e->intl; - return true; - } - err_print(e->where, "Not implemented yet"); - return false; -} +/* static bool eval_expr_as_float(Expression *e, FloatLiteral *f) { */ +/* switch (e->kind) { */ +/* case EXPR_FLOAT_LITERAL: */ +/* *f = e->floatl; */ +/* return true; */ +/* case EXPR_INT_LITERAL: */ +/* *f = (FloatLiteral)e->intl; */ +/* return true; */ +/* } */ +/* err_print(e->where, "Not implemented yet"); */ +/* return false; */ +/* } */ -static bool eval_expr_as_int(Expression *e, IntLiteral *i) { +static bool eval_expr_as_int(Expression *e, Integer *i) { + /* OPTIM: cache eval'd expression values? (probably only for declarations) */ switch (e->kind) { case EXPR_FLOAT_LITERAL: err_print(e->where, "Expected integer, but found floating-point literal."); return false; case EXPR_INT_LITERAL: - *i = e->intl; + if (e->intl > (UInteger)INTEGER_MAX) { /* TODO: FIXME */ + err_print(e->where, "Overflow when evaluating integer."); + return false; + } + *i = (Integer)e->intl; return true; + case EXPR_STR_LITERAL: + err_print(e->where, "Expected integer, but found string literal."); + return false; + case EXPR_UNARY_OP: + switch (e->unary.op) { + case UNARY_MINUS: { + Integer of; + if (!eval_expr_as_int(e->unary.of, &of)) return false; + *i = -of; + return true; + } + } + break; + case EXPR_BINARY_OP: { + + switch (e->binary.op) { + case BINARY_PLUS: + case BINARY_MINUS: { + Integer lhs, rhs; + if (!eval_expr_as_int(e->binary.lhs, &lhs)) return false; + if (!eval_expr_as_int(e->binary.rhs, &rhs)) return false; + switch (e->binary.op) { + case BINARY_PLUS: + *i = lhs + rhs; + return true; + case BINARY_MINUS: + *i = lhs - rhs; + return true; + } + } + } + } break; + case EXPR_IDENT: { + Identifier id = e->ident; + IdentDecl *id_decl = ident_decl(id); + if (!id_decl) { + char *id_str = ident_to_str(id); + err_print(e->where, "Undeclared identifier: %s", id_str); + free(id_str); + return false; + } + Declaration *d = id_decl->decl; + if (!(d->flags & DECL_FLAG_CONST)) { + err_print(e->where, "Use of non-constant identifier in a constant expression."); + info_print(d->where, "Declaration was here."); + return false; + } + if (d->type.kind != TYPE_BUILTIN || !type_builtin_is_integer(d->type.builtin)) { + char type_str[128]; + type_to_str(&d->type, type_str, sizeof type_str); + err_print(e->where, "Expected integer, but identifier has type %s.", type_str); + info_print(d->where, "Declaration was here."); + return false; + } + eval_expr_as_int(&d->expr, i); + + return true; + } break; + case EXPR_FN: + err_print(e->where, "Expected integer, but found function."); + return false; } err_print(e->where, "Not implemented yet"); return false; |