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Fix loading structs into params via an offset pointer.

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For certain values of "fix" :/. The code is ugly, but it does the right
thing: calculate the effect address and use the resulting pointer in a
move instruction.
This commit is contained in:
Bill Currie 2011-02-14 15:13:58 +09:00
parent 352be1f8bd
commit bcaf3687c5
1 changed files with 35 additions and 8 deletions
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43
tools/qfcc/source/statements.c
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@ -452,26 +452,53 @@ expr_address (sblock_t *sblock, expr_t *e, operand_t **op)
} }
static sblock_t * static sblock_t *
expr_deref (sblock_t *sblock, expr_t *e, operand_t **op) expr_deref (sblock_t *sblock, expr_t *deref, operand_t **op)
{ {
type_t *type = e->e.expr.type; type_t *type = deref->e.expr.type;
expr_t *e;
e = e->e.expr.e1; e = deref->e.expr.e1;
if (e->type == ex_uexpr && e->e.expr.op == '&' if (e->type == ex_uexpr && e->e.expr.op == '&'
&& e->e.expr.e1->type == ex_symbol) { && e->e.expr.e1->type == ex_symbol) {
*op = new_operand (op_symbol); *op = new_operand (op_symbol);
(*op)->type = low_level_type (type); (*op)->type = low_level_type (type);
(*op)->o.symbol = e->e.expr.e1->e.symbol; (*op)->o.symbol = e->e.expr.e1->e.symbol;
} else if (e->type == ex_expr && e->e.expr.op == '&') { } else if (e->type == ex_expr && e->e.expr.op == '&') {
statement_t *s = new_statement (".", e); statement_t *s;
sblock = statement_subexpr (sblock, e->e.expr.e1, &s->opa); operand_t *ptr = 0;
sblock = statement_subexpr (sblock, e->e.expr.e2, &s->opb); operand_t *offs = 0;
sblock = statement_subexpr (sblock, e->e.expr.e1, &ptr);
sblock = statement_subexpr (sblock, e->e.expr.e2, &offs);
if (!*op) { if (!*op) {
*op = new_operand (op_temp); *op = new_operand (op_temp);
(*op)->type = low_level_type (type); (*op)->type = low_level_type (type);
} }
s->opc = *op; if (low_level_type (type) == ev_void) {
sblock_add_statement (sblock, s); operand_t *addr;
addr = new_operand (op_temp);
addr->type = ev_pointer;
s = new_statement ("&", e);
s->opa = ptr;
s->opb = offs;
s->opc = addr;
sblock_add_statement (sblock, s);
s = new_statement ("<MOVE>", deref);
s->opa = addr;
//FIXME make convenience routines
s->opb = new_operand (op_value);
s->opb->type = ev_short;
s->opb->o.value = calloc (1, sizeof (ex_value_t));
s->opb->o.value->type = ev_short;
s->opb->o.value->v.short_val = type_size (type);
s->opc = *op;
sblock_add_statement (sblock, s);
} else {
s = new_statement (".", deref);
s->opa = ptr;
s->opb = offs;
s->opc = *op;
sblock_add_statement (sblock, s);
}
} else if (e->type == ex_value && e->e.value.type == ev_pointer) { } else if (e->type == ex_value && e->e.value.type == ev_pointer) {
*op = new_operand (op_pointer); *op = new_operand (op_pointer);
(*op)->type = low_level_type (e->e.value.v.pointer.type); (*op)->type = low_level_type (e->e.value.v.pointer.type);