#include "irouts.h"
#include "irgwalk.h"
#include "irprintf.h"
+#include "debug.h"
+
+/** The debug handle. */
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
/** The source language specific language disambiguator function. */
static DISAMBIGUATOR_FUNC language_disambuigator = NULL;
} /* find_base_adr */
/**
- * Check if the address can be decomposed into base PLUS offset.
+ * Check if a given Const node is greater or equal a given size.
+ *
+ * @return no_alias if the Const is greater, may_alias else
*/
-static int has_offset(ir_node *adr, int *offset) {
- if (is_SymConst(adr)) {
- *offset = 0;
- return 1;
- }
- if (is_Sel(adr)) {
- ir_entity *ent = get_Sel_entity(adr);
- ir_type *owner = get_entity_owner(ent);
+static ir_alias_relation check_const(ir_node *cns, int size) {
+ tarval *tv = get_Const_tarval(cns);
+ tarval *tv_size;
- if (get_type_state(owner) != layout_fixed) {
- /* The layout is NOT fixed yet, symbolic evaluation needed */
- }
- }
- return 0;
-} /* has_offset */
+ if (size == 0)
+ return classify_tarval(tv) != TV_CLASSIFY_NULL ? no_alias : may_alias;
+ tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
+ return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
+} /* check_const */
/**
- * Two address expressions have the same base address,
- * check if there offsets are different.
+ * Treat idx1 and idx2 as integer indexes and check if they differ always more than size.
*
- * @param adr1 The first address.
- * @param adr2 The second address.
+ * @return sure_alias iff idx1 == idx2
+ * no_alias iff they ALWAYS differ more than size
+ * may_alias else
*/
-static ir_alias_relation different_offsets(ir_node *adr1, ir_node *adr2) {
- int offset1, offset2;
- if (has_offset(adr1, &offset1) && has_offset(adr2, &offset2)) {
- /* */
- }
- return may_alias;
-} /* different_offsets */
-
-/**
- * idx1 and idx2 represent two integer indexes. Check if they could be classified
- */
-static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2) {
- ir_alias_relation res = may_alias;
-
+static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) {
if (idx1 == idx2)
return sure_alias;
if (is_Const(idx1) && is_Const(idx2)) {
/* both are const, we can compare them */
- return get_Const_tarval(idx1) == get_Const_tarval(idx2) ? sure_alias : no_alias;
+ tarval *tv1 = get_Const_tarval(idx1);
+ tarval *tv2 = get_Const_tarval(idx2);
+ tarval *tv, *tv_size;
+
+ if (size == 0)
+ return tv1 == tv2 ? sure_alias : no_alias;
+
+ if (tarval_cmp(tv1, tv2) == pn_Cmp_Gt) {
+ tarval *t = tv1;
+ tv1 = tv2;
+ tv2 = t;
+ }
+ /* tv1 is now the "smaller" one */
+ tv = tarval_sub(tv2, tv1);
+ tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
+ return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
}
/* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
if (l1 == idx2) {
/* x + c == y */
- if (is_Const(r1)) {
- return classify_Const(r1) == CNST_NULL ? sure_alias : no_alias;
- }
+ if (is_Const(r1))
+ return check_const(r1, size);
}
if (is_Add(idx2)) {
- /* both are Adds, check if they are of x + c kind */
+ /* both are Adds, check if they are of x + a == x + b kind */
ir_node *l2 = get_Add_left(idx2);
ir_node *r2 = get_Add_right(idx2);
if (l1 == l2)
- res = different_index(r1, r2);
+ return different_index(r1, r2, size);
else if (l1 == r2)
- res = different_index(r1, l2);
+ return different_index(r1, l2, size);
else if (r1 == r2)
- res = different_index(l1, l2);
+ return different_index(l1, l2, size);
else if (r1 == l2)
- res = different_index(l1, r2);
- if (res != may_alias)
- return res;
+ return different_index(l1, r2, size);
}
}
if (is_Add(idx2)) {
if (l2 == idx1) {
/* x + c == y */
- if (is_Const(r2)) {
- return classify_Const(r2) == CNST_NULL ? sure_alias : no_alias;
- }
+ if (is_Const(r2))
+ return check_const(r2, size);
}
}
if (l1 == idx2) {
/* x - c == y */
- if (is_Const(r1)) {
- return classify_Const(r1) == CNST_NULL ? sure_alias : no_alias;
- }
+ if (is_Const(r1))
+ return check_const(r1, size);
}
if (is_Sub(idx2)) {
- /* both are Subs, check if they are of x - c kind */
+ /* both are Subs, check if they are of x - a == x - b kind */
ir_node *l2 = get_Sub_left(idx2);
if (l1 == l2) {
ir_node *r2 = get_Sub_right(idx2);
- res = different_index(r1, r2);
+ return different_index(r1, r2, size);
}
}
- if (res != may_alias)
- return res;
}
if (is_Sub(idx2)) {
ir_node *l2 = get_Sub_left(idx2);
if (l2 == idx1) {
/* x - c == y */
- if (is_Const(r2)) {
- return classify_Const(r2) == CNST_NULL ? sure_alias : no_alias;
- }
+ if (is_Const(r2))
+ return check_const(r2, size);
}
}
if (tp1 == tp2)
check_arr = 1;
else if (get_type_state(tp1) == layout_fixed && get_type_state(tp2) == layout_fixed &&
- get_type_size_bytes(tp1) == get_type_size_bytes(tp2))
+ get_type_size_bits(tp1) == get_type_size_bits(tp2))
check_arr = 1;
}
if (check_arr) {
for (i = 0; i < n; ++i) {
ir_node *idx1 = get_Sel_index(sel1, i);
ir_node *idx2 = get_Sel_index(sel2, i);
- ir_alias_relation res = different_index(idx1, idx2);
+ ir_alias_relation res = different_index(idx1, idx2, 0); /* we can safely IGNORE the size here if it's at least >0 */
if (res == may_alias)
return may_alias;
return may_alias;
} /* different_types */
+/**
+ * Check if an offset is a constant and these constant is bigger or equal
+ * than a given size.
+ */
+static int check_const_offset(ir_node *offset, int size) {
+ ir_mode *mode = get_irn_mode(offset);
+
+ /* ok, we found an offset, check for constant */
+ if (is_Const(offset) && mode_is_int(mode)) {
+ tarval *tv = new_tarval_from_long(size, mode);
+
+ /* size <= offset ? */
+ if (tarval_cmp(tv, get_Const_tarval(offset)) & (pn_Cmp_Eq|pn_Cmp_Lt))
+ return 1;
+ }
+ return 0;
+} /* check_const_offset */
+
+/**
+ * Check if we can determine that the two pointers always have an offset bigger then size
+ */
+static ir_alias_relation _different_pointer(ir_node *adr1, ir_node *adr2, int size) {
+ int found = 0;
+
+ if (is_Add(adr1)) {
+ /* first address is the result of a pointer addition */
+ ir_node *l1 = get_Add_left(adr1);
+ ir_node *r1 = get_Add_right(adr1);
+
+ if (l1 == adr2) {
+ found = check_const_offset(r1, size);
+ } else if (r1 == adr2) {
+ found = check_const_offset(l1, size);
+ } else if (is_Add(adr2)) {
+ /* second address is the result of a pointer addition */
+ ir_node *l2 = get_Add_left(adr2);
+ ir_node *r2 = get_Add_right(adr2);
+
+ if (l1 == l2) {
+ return _different_pointer(r1, r2, size);
+ } else if (l1 == r2) {
+ return _different_pointer(r1, l2, size);
+ } else if (r1 == l2) {
+ return _different_pointer(l1, r2, size);
+ } else if (r1 == r2) {
+ return _different_pointer(l1, l2, size);
+ }
+ }
+ } else if (is_Add(adr2)) {
+ /* second address is the result of a pointer addition */
+ ir_node *l2 = get_Add_left(adr2);
+ ir_node *r2 = get_Add_right(adr2);
+
+ if (l2 == adr1) {
+ found = check_const_offset(r2, size);
+ } else if (r2 == adr1) {
+ found = check_const_offset(l2, size);
+ }
+ } else {
+ return different_index(adr1, adr2, size);
+ }
+ return found ? no_alias : may_alias;
+} /* _different_pointer */
+
+/**
+ * Check if we can determine that the two pointers always have an offset bigger then the maximum size of mode1, mode2
+ */
+static ir_alias_relation different_pointer(ir_node *adr1, ir_mode *mode1, ir_node *adr2, ir_mode *mode2) {
+ int size = get_mode_size_bytes(mode1);
+ int n = get_mode_size_bytes(mode2);
+
+ if (n > size)
+ size = n;
+ return _different_pointer(adr1, adr2, size);
+} /* different_pointer */
+
/**
* Returns non-zero if a node is a routine parameter.
*
if (get_SymConst_entity(adr1) != get_SymConst_entity(adr2))
return no_alias;
else {
- /* equal addresses */
+ /* equal entity addresses */
return sure_alias;
}
}
/* base2 address is a global var (R1 a) */
if (adr1 != base2)
return no_alias;
- else
- return different_offsets(adr1, adr2);
} else if (base2 == get_irg_frame(irg)) {
/* the second one is a local variable so they are always
different (R1 b) */
ir_node *base1 = find_base_adr(adr1, &ent1);
if (base1 == get_irg_frame(irg)) {
- /* the first is a local variable */
+ /* first is a local variable ent1 */
if (is_Sel(adr2)) {
/* the second address is a Sel */
ir_node *base2 = find_base_adr(adr2, &ent2);
- if (base1 == base2)
+ if (base1 == base2) {
+ /* identical bases: check for different offsets */
return different_sel_offsets(adr1, adr2);
- else if (base2 == get_irg_frame(irg)) {
+ } else if (base2 == get_irg_frame(irg)) {
/* both addresses are local variables and we know
they are different (R1 a) */
if (ent1 != ent2)
}
}
}
+ } else {
+ /* some pointers, check if they have the same base buf constant offset */
+ ir_alias_relation rel = different_pointer(adr1, mode1, adr2, mode2);
+ if (rel != may_alias)
+ return rel;
}
+
if (options & aa_opt_type_based) { /* Type based alias analysis */
ir_alias_relation rel;
static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) {
const mem_disambig_entry *p1 = elt;
const mem_disambig_entry *p2 = key;
+ (void) size;
return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2;
} /* cmp_mem_disambig_entry */
* @param irn the node
*/
static ir_address_taken_state find_address_taken_state(ir_node *irn) {
- int i;
+ int i, j;
ir_mode *emode, *mode;
ir_node *value;
ir_entity *ent;
case iro_Call:
/* Only the call address is not an address taker but
this is an uninteresting case, so we ignore it here. */
- return ir_address_taken;
+ for (j = get_Call_n_params(succ) - 1; j >= 0; --j) {
+ ir_node *param = get_Call_param(succ, j);
+ if (param == irn)
+ return ir_address_taken;
+ }
+ break;
default:
/* another op, the address may be taken */
}
} /* init_taken_flag */
-#if 0
+#ifdef DEBUG_libfirm
/**
* Print the address taken state of all entities of a given type for debugging.
*/
ir_address_taken_state state = get_entity_address_taken(ent);
if (state != ir_address_not_taken) {
- assert(ir_address_not_taken <= state && state <= ir_address_taken);
+ assert(ir_address_not_taken <= (int) state && state <= ir_address_taken);
ir_printf("%+F: %s\n", ent, get_address_taken_state_name(state));
}
}
} /* print_address_taken_state */
-#endif
+#endif /* DEBUG_libfirm */
/**
* Post-walker: check for global entity address
static void analyse_irp_globals_address_taken(void) {
int i;
+ FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
+
init_taken_flag(get_glob_type());
init_taken_flag(get_tls_type());
assure_irg_outs(irg);
irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg));
}
- //print_address_taken_state(get_glob_type());
- //print_address_taken_state(get_tls_type());
+
+#ifdef DEBUG_libfirm
+ if (firm_dbg_get_mask(dbg) & LEVEL_1) {
+ print_address_taken_state(get_glob_type());
+ print_address_taken_state(get_tls_type());
+ }
+#endif /* DEBUG_libfirm */
/* now computed */
irp->globals_adr_taken_state = ir_address_taken_computed;
if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
analyse_irp_globals_address_taken();
} /* assure_irp_globals_address_taken_computed */
+
+
+DEBUG_ONLY(static firm_dbg_module_t *dbgcall = NULL;)
+
+/**
+ * Copy the calling conventions from the entities to the call type.
+ */
+static void update_calls(ir_node *call, void *env) {
+ (void) env;
+ if (is_Call(call)) {
+ ir_node *ptr = get_Call_ptr(call);
+
+ if (is_SymConst(ptr)) {
+ ir_entity *ent = get_SymConst_entity(ptr);
+ ir_type *mtp = get_entity_type(ent);
+ ir_type *ctp = get_Call_type(call);
+
+ if (mtp != ctp && get_method_additional_properties(mtp) & mtp_property_private) {
+ set_method_additional_property(ctp, mtp_property_private);
+ DB((dbgcall, LEVEL_1, "changed call to private method %+F\n", ent));
+ }
+ }
+ }
+}
+
+/* Mark all private methods, i.e. those of which all call sites are known. */
+void mark_private_methods(void) {
+ int i;
+ int changed = 0;
+
+ FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc");
+
+ assure_irp_globals_address_taken_computed();
+
+ /* first step: change the calling conventions of the local non-escaped entities */
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ ir_graph *irg = get_irp_irg(i);
+ ir_entity *ent = get_irg_entity(irg);
+ ir_address_taken_state state = get_entity_address_taken(ent);
+
+ if (get_entity_visibility(ent) == visibility_local &&
+ state == ir_address_not_taken) {
+ ir_type *mtp = get_entity_type(ent);
+
+ set_method_additional_property(mtp, mtp_property_private);
+ changed = 1;
+ DB((dbgcall, LEVEL_1, "found private method %+F\n", ent));
+ }
+ }
+
+ if (changed)
+ all_irg_walk(NULL, update_calls, NULL);
+}