/**
* Returns non-zero if a node is a routine parameter.
*
- * @param node the node to test
+ * @param node the Proj node to test
*/
static int is_arg_Proj(ir_node *node) {
- if (! is_Proj(node))
- return 0;
node = get_Proj_pred(node);
if (! is_Proj(node))
return 0;
return pn_Start_T_args == get_Proj_proj(node) && is_Start(get_Proj_pred(node));
} /* is_arg_Proj */
+/**
+ * Returns non-zero if a node is a result on a malloc-like routine.
+ *
+ * @param node the Proj node to test
+ */
+static int is_malloc_Result(ir_node *node) {
+ node = get_Proj_pred(node);
+ if (! is_Proj(node))
+ return 0;
+ node = get_Proj_pred(node);
+ if (! is_Call(node))
+ return 0;
+ node = get_Call_ptr(node);
+ if (is_SymConst_addr_ent(node)) {
+ ir_entity *ent = get_SymConst_entity(node);
+
+ if (get_entity_additional_properties(ent) & mtp_property_malloc)
+ return 1;
+ return 0;
+ }
+ return 0;
+} /* is_malloc_Result */
+
/**
* Returns true if an address represents a global variable.
*
/* equal entity addresses */
return sure_alias;
}
- }
- if (is_Sel(adr2)) {
+ } else if (is_Sel(adr2)) {
ir_node *base2 = find_base_adr(adr2, &ent2);
if (is_global_var(base2)) {
/* the second one is a TLS variable so they are always
different (R1 c) */
return no_alias;
+ } else if (is_Proj(base2)) {
+ if (is_malloc_Result(base2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory, (R1 f) */
+ return no_alias;
+ }
+ }
+ } else if (is_Proj(adr2)) {
+ if (is_malloc_Result(adr2)) {
+ /* the second one is a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory, (R1 f) */
+ return no_alias;
}
}
/* the second one is a TLS variable so they are always
different (R1 d) */
return no_alias;
- } else if (is_arg_Proj(base2)) {
- /* the second one is an offset from a parameter so they are
- always different (R1 e) */
+ } else if (is_Proj(base2)) {
+ if (is_arg_Proj(base2)) {
+ /* the second one is an offset from a parameter so they are
+ always different (R1 e) */
+ return no_alias;
+ } else if (is_malloc_Result(base2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 g) */
+ return no_alias;
+ }
+ }
+ } else if (is_Proj(adr2)) {
+ if (is_arg_Proj(adr2)) {
+ /* a local variable and a parameter are always different (R1 e) */
+ return no_alias;
+ } else if (is_malloc_Result(adr2)) {
+ /* the second one is a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 g) */
return no_alias;
}
- } else if (is_arg_Proj(adr2)) {
- /* a local variable and a parameter are always different (R1 e) */
- return no_alias;
}
} else if (base1 == get_irg_tls(irg)) {
/* the first is a TLS variable */
/* the second address is a Sel */
ir_node *base2 = find_base_adr(adr2, &ent2);
- if (base1 == base2)
+ if (base1 == base2) {
if (ent1 != ent2) {
/* both addresses are tls variables and we know
they are different (R1 a) */
+ return no_alias;
} else {
/* same tls var */
return different_sel_offsets(adr1, adr2);
}
- else if (base2 == get_irg_frame(irg)) {
+ } else if (base2 == get_irg_frame(irg)) {
/* the first one is a tls variable, the second a local one,
they are different (R1 d) */
return no_alias;
+ } else if (is_Proj(base2)) {
+ if (is_malloc_Result(base2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 h) */
+ return no_alias;
+ }
}
- }
- } else if (is_arg_Proj(base1)) {
- /* the first one is an offset from a parameter */
- if (is_Sel(adr2)) {
- /* the second address is a Sel */
- ir_node *base2 = find_base_adr(adr2, &ent2);
-
- if (base2 == get_irg_frame(irg)) {
- /* the second one is a local variable so they are always
- different (R1 e) */
+ } else if (is_Proj(adr2)) {
+ if (is_malloc_Result(adr2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 h) */
return no_alias;
}
}
+ } else if (is_Proj(base1)) {
+ if (is_arg_Proj(base1)) {
+ /* the first one is an offset from a parameter */
+ if (is_Sel(adr2)) {
+ /* the second address is a Sel */
+ ir_node *base2 = find_base_adr(adr2, &ent2);
+
+ if (base2 == get_irg_frame(irg)) {
+ /* the second one is a local variable so they are always
+ different (R1 e) */
+ return no_alias;
+ } else if (is_Proj(base2)) {
+ if (is_malloc_Result(base2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 í) */
+ return no_alias;
+ }
+ }
+ } else if (is_Proj(adr2)) {
+ if (is_malloc_Result(adr2)) {
+ /* the second one is a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 í) */
+ return no_alias;
+ }
+ }
+ }
} else if (is_global_var(base1)) {
- /* the first one is a global variable */
+ /* the first one is an offset from a global variable */
ent1 = get_SymConst_entity(base1);
if (is_Sel(adr2)) {
/* the second address is a Sel */
if (base1 == base2) {
/* same global var */
return different_sel_offsets(adr1, adr2);
- }
- else if (base2 == get_irg_frame(irg)) {
+ } else if (base2 == get_irg_frame(irg)) {
/* the second one is a local variable so they are always
different (R1 a) */
return no_alias;
/* the second one is a TLS variable so they are always
different (R1 a) */
return no_alias;
- } else if (is_arg_Proj(base2)) {
- if (get_entity_address_taken(ent1) == ir_address_not_taken) {
- /* The address of the global variable was never taken, so
- the pointer cannot match (R2). */
+ } else if (is_Proj(base2)) {
+ if (is_arg_Proj(base2)) {
+ if (get_entity_address_taken(ent1) == ir_address_not_taken) {
+ /* The address of the global variable was never taken, so
+ the pointer cannot match (R2). */
+ return no_alias;
+ }
+ } else if (is_malloc_Result(base2)) {
+ /* the second one is an offset from a result of a malloc like call, ie.
+ freshly allocated non-aliases heap memory (R1 g) */
return no_alias;
}
} else if (is_global_var(base2)) {
}
}
} else {
+ /* Note: we cannot check for malloc result here, as we cannot be sure the result is not stored anywhere
+ after getting if.
+ */
+
/* 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)
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