/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* @brief Memory disambiguator
* @author Michael Beck
* @date 27.12.2006
- * @version $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
#include <stdlib.h>
+#include <stdbool.h>
+#include "adt/pmap.h"
#include "irnode_t.h"
#include "irgraph_t.h"
#include "irprog_t.h"
+#include "irmemory_t.h"
#include "irmemory.h"
#include "irflag.h"
#include "hashptr.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "debug.h"
+#include "error.h"
+#include "typerep.h"
+#include "irpass.h"
/** The debug handle. */
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
+DEBUG_ONLY(static firm_dbg_module_t *dbgcall = NULL;)
/** The source language specific language disambiguator function. */
static DISAMBIGUATOR_FUNC language_disambuigator = NULL;
/** The global memory disambiguator options. */
static unsigned global_mem_disamgig_opt = aa_opt_no_opt;
-/* Returns a human readable name for an alias relation. */
-const char *get_ir_alias_relation_name(ir_alias_relation rel) {
+const char *get_ir_alias_relation_name(ir_alias_relation rel)
+{
#define X(a) case a: return #a
switch (rel) {
- X(no_alias);
- X(may_alias);
- X(sure_alias);
- default: assert(0); return "UNKNOWN";
+ X(ir_no_alias);
+ X(ir_may_alias);
+ X(ir_sure_alias);
+ default:
+ panic("UNKNOWN alias relation");
}
#undef X
}
-/* Get the memory disambiguator options for a graph. */
-unsigned get_irg_memory_disambiguator_options(ir_graph *irg) {
+unsigned get_irg_memory_disambiguator_options(const ir_graph *irg)
+{
unsigned opt = irg->mem_disambig_opt;
if (opt & aa_opt_inherited)
return global_mem_disamgig_opt;
return opt;
-} /* get_irg_memory_disambiguator_options */
+}
-/* Set the memory disambiguator options for a graph. */
-void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options) {
+void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options)
+{
irg->mem_disambig_opt = options & ~aa_opt_inherited;
-} /* set_irg_memory_disambiguator_options */
+}
-/* Set the global disambiguator options for all graphs not having local options. */
-void set_irp_memory_disambiguator_options(unsigned options) {
+void set_irp_memory_disambiguator_options(unsigned options)
+{
global_mem_disamgig_opt = options;
-} /* set_irp_memory_disambiguator_options */
+}
+
+ir_storage_class_class_t get_base_sc(ir_storage_class_class_t x)
+{
+ return x & ~ir_sc_modifiers;
+}
/**
* Find the base address and entity of an Sel node.
*
* @return the base address.
*/
-static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) {
+static ir_node *find_base_adr(const ir_node *sel, ir_entity **pEnt)
+{
ir_node *ptr = get_Sel_ptr(sel);
while (is_Sel(ptr)) {
}
*pEnt = get_Sel_entity(sel);
return ptr;
-} /* find_base_adr */
+}
/**
* Check if a given Const node is greater or equal a given size.
*
- * @return no_alias if the Const is greater, may_alias else
+ * @param cns a Const node
+ * @param size a integer size
+ *
+ * @return ir_no_alias if the Const is greater, ir_may_alias else
*/
-static ir_alias_relation check_const(ir_node *cns, int size) {
- tarval *tv = get_Const_tarval(cns);
- tarval *tv_size;
+static ir_alias_relation check_const(const ir_node *cns, int size)
+{
+ ir_tarval *tv = get_Const_tarval(cns);
+ ir_tarval *tv_size;
if (size == 0)
- return tarval_is_null(tv) ? may_alias : no_alias;
+ return tarval_is_null(tv) ? ir_may_alias : ir_no_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 */
+ return tarval_cmp(tv_size, tv) & (ir_relation_less_equal) ? ir_no_alias : ir_may_alias;
+}
/**
* Treat idx1 and idx2 as integer indexes and check if they differ always more than size.
*
- * @return sure_alias iff idx1 == idx2
- * no_alias iff they ALWAYS differ more than size
- * may_alias else
+ * @param idx1 a node representing the first index
+ * @param idx2 a node representing the second index
+ * @param size an integer size
+ *
+ * @return ir_sure_alias iff idx1 == idx2
+ * ir_no_alias iff they ALWAYS differ more than size
+ * ir_may_alias else
*/
-static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) {
+static ir_alias_relation different_index(const ir_node *idx1, const ir_node *idx2, int size)
+{
if (idx1 == idx2)
- return sure_alias;
+ return ir_sure_alias;
if (is_Const(idx1) && is_Const(idx2)) {
/* both are const, we can compare them */
- tarval *tv1 = get_Const_tarval(idx1);
- tarval *tv2 = get_Const_tarval(idx2);
- tarval *tv, *tv_size;
+ ir_tarval *tv1 = get_Const_tarval(idx1);
+ ir_tarval *tv2 = get_Const_tarval(idx2);
+ ir_tarval *tv, *tv_size;
ir_mode *m1, *m2;
if (size == 0)
- return tv1 == tv2 ? sure_alias : no_alias;
+ return tv1 == tv2 ? ir_sure_alias : ir_no_alias;
/* arg, modes may be different */
m1 = get_tarval_mode(tv1);
m1 = mode_is_signed(m1) ? find_signed_mode(m2) : find_unsigned_mode(m2);
if (m1 == NULL) {
/* should NOT happen, but if it does we give up here */
- return may_alias;
+ return ir_may_alias;
}
tv1 = tarval_convert_to(tv1, m1);
} else if (size > 0) {
m2 = mode_is_signed(m2) ? find_signed_mode(m1) : find_unsigned_mode(m1);
if (m2 == NULL) {
/* should NOT happen, but if it does we give up here */
- return may_alias;
+ return ir_may_alias;
}
tv2 = tarval_convert_to(tv2, m2);
}
if (get_mode_sign(m1) != get_mode_sign(m2)) {
/* find the signed */
if (mode_is_signed(m2)) {
- tarval *t = tv1;
+ ir_tarval *t = tv1;
ir_mode *tm = m1;
tv1 = tv2; m1 = m2;
tv2 = t; m2 = tm;
}
/* m1 is now the signed one */
- if (tarval_cmp(tv1, get_tarval_null(m1)) & (pn_Cmp_Eq|pn_Cmp_Gt)) {
+ if (!tarval_is_negative(tv1)) {
/* tv1 is signed, but >= 0, simply cast into unsigned */
tv1 = tarval_convert_to(tv1, m2);
} else {
tv_size = new_tarval_from_long(size, m2);
- if (tarval_cmp(tv2, tv_size) & (pn_Cmp_Eq|pn_Cmp_Gt)) {
+ if (tarval_cmp(tv2, tv_size) & (ir_relation_greater_equal)) {
/* tv1 is negative and tv2 >= tv_size, so the difference is bigger than size */
- return no_alias;
+ return ir_no_alias;
}
/* tv_size > tv2, so we can subtract without overflow */
- tv2 = tarval_sub(tv_size, tv2);
+ tv2 = tarval_sub(tv_size, tv2, NULL);
/* tv1 is < 0, so we can negate it */
tv1 = tarval_neg(tv1);
tv1 = tarval_convert_to(tv1, m2);
/* now we can compare without overflow */
- return tarval_cmp(tv1, tv2) & (pn_Cmp_Eq|pn_Cmp_Gt) ? no_alias : may_alias;
+ return tarval_cmp(tv1, tv2) & (ir_relation_greater_equal) ? ir_no_alias : ir_may_alias;
}
}
}
- if (tarval_cmp(tv1, tv2) == pn_Cmp_Gt) {
- tarval *t = tv1;
+ if (tarval_cmp(tv1, tv2) == ir_relation_greater) {
+ ir_tarval *t = tv1;
tv1 = tv2;
tv2 = t;
}
/* tv1 is now the "smaller" one */
- tv = tarval_sub(tv2, tv1);
+ tv = tarval_sub(tv2, tv1, NULL);
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;
+ return tarval_cmp(tv_size, tv) & (ir_relation_less_equal) ? ir_no_alias : ir_may_alias;
}
/* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
}
}
- return may_alias;
-} /* different_index */
+ return ir_may_alias;
+}
/**
- * Two Sel addresses have the same base address, check if there offsets are different.
+ * Two Sel addresses have the same base address, check if their offsets are
+ * different.
*
* @param adr1 The first address.
* @param adr2 The second address.
*/
-static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) {
- /* seems to be broken */
+static ir_alias_relation different_sel_offsets(const ir_node *sel1, const ir_node *sel2)
+{
+ /* TODO: fix */
+ (void) sel1;
+ (void) sel2;
#if 0
ir_entity *ent1 = get_Sel_entity(sel1);
ir_entity *ent2 = get_Sel_entity(sel2);
return have_no > 0 ? no_alias : sure_alias;
}
}
+#else
+ (void) different_index;
#endif
- return may_alias;
-} /* different_sel_offsets */
+ return ir_may_alias;
+}
/**
* Determine the alias relation by checking if adr1 and adr2 are pointer
* @param adr1 The first address.
* @param adr2 The second address.
*/
-static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2)
+static ir_alias_relation different_types(const ir_node *adr1, const ir_node *adr2)
{
ir_entity *ent1 = NULL, *ent2 = NULL;
- if (is_SymConst(adr1) && get_SymConst_kind(adr1) == symconst_addr_ent)
+ if (is_SymConst_addr_ent(adr1))
ent1 = get_SymConst_entity(adr1);
else if (is_Sel(adr1))
ent1 = get_Sel_entity(adr1);
- if (is_SymConst(adr2) && get_SymConst_kind(adr2) == symconst_addr_ent)
+ if (is_SymConst_addr_ent(adr2))
ent2 = get_SymConst_entity(adr2);
else if (is_Sel(adr2))
ent2 = get_Sel_entity(adr2);
ir_type *tp2 = get_entity_type(ent2);
if (tp1 != tp2) {
- if (is_Pointer_type(tp1) && is_Pointer_type(tp2)) {
- /* do deref until no pointer types are found */
- do {
- tp1 = get_pointer_points_to_type(tp1);
- tp2 = get_pointer_points_to_type(tp2);
- } while (is_Pointer_type(tp1) && is_Pointer_type(tp2));
+ /* do deref until no pointer types are found */
+ while (is_Pointer_type(tp1) && is_Pointer_type(tp2)) {
+ tp1 = get_pointer_points_to_type(tp1);
+ tp2 = get_pointer_points_to_type(tp2);
}
if (get_type_tpop(tp1) != get_type_tpop(tp2)) {
/* different type structure */
- return no_alias;
+ return ir_no_alias;
}
if (is_Class_type(tp1)) {
/* check class hierarchy */
if (! is_SubClass_of(tp1, tp2) &&
! is_SubClass_of(tp2, tp1))
- return no_alias;
+ return ir_no_alias;
} else {
/* different types */
- return no_alias;
+ return ir_no_alias;
}
}
}
- return may_alias;
-} /* different_types */
+ return ir_may_alias;
+}
/**
- * Check if an offset is a constant and these constant is bigger or equal
- * than a given size.
+ * Returns non-zero if a node is a result on a malloc-like routine.
+ *
+ * @param node the Proj node to test
*/
-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);
+static int is_malloc_Result(const 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);
- /* size <= offset ? */
- if (tarval_cmp(tv, get_Const_tarval(offset)) & (pn_Cmp_Eq|pn_Cmp_Lt))
+ if (get_entity_additional_properties(ent) & mtp_property_malloc)
return 1;
+ return 0;
}
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);
+ir_storage_class_class_t classify_pointer(const ir_node *irn,
+ const ir_entity *ent)
+{
+ ir_graph *irg = get_irn_irg(irn);
+ ir_storage_class_class_t res = ir_sc_pointer;
+ if (is_SymConst_addr_ent(irn)) {
+ ir_entity *entity = get_SymConst_entity(irn);
+ ir_type *owner = get_entity_owner(entity);
+ res = owner == get_tls_type() ? ir_sc_tls : ir_sc_globalvar;
+ if (! (get_entity_usage(entity) & ir_usage_address_taken))
+ res |= ir_sc_modifier_nottaken;
+ } else if (irn == get_irg_frame(irg)) {
+ res = ir_sc_localvar;
+ if (ent != NULL && !(get_entity_usage(ent) & ir_usage_address_taken))
+ res |= ir_sc_modifier_nottaken;
+ } else if (is_Proj(irn) && is_malloc_Result(irn)) {
+ return ir_sc_malloced;
+ } else if (is_Const(irn)) {
+ return ir_sc_globaladdr;
+ } else if (is_arg_Proj(irn)) {
+ res |= ir_sc_modifier_argument;
}
- 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 */
+ return res;
+}
/**
- * Returns non-zero if a node is a routine parameter.
- *
- * @param node the node to test
+ * If adr represents a Bitfield Sel, skip it
*/
-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 */
+static const ir_node *skip_Bitfield_Sels(const ir_node *adr)
+{
+ if (is_Sel(adr)) {
+ ir_entity *ent = get_Sel_entity(adr);
+ ir_type *bf_type = get_entity_type(ent);
-/**
- * Returns true if an address represents a global variable.
- */
-static INLINE int is_global_var(ir_node *irn) {
- return is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent;
-} /* is_global_var */
+ /* is it a bitfield type? */
+ if (is_Primitive_type(bf_type) && get_primitive_base_type(bf_type) != NULL)
+ adr = get_Sel_ptr(adr);
+ }
+ return adr;
+}
/**
* Determine the alias relation between two addresses.
+ *
+ * @param addr1 pointer address of the first memory operation
+ * @param mode1 the mode of the accessed data through addr1
+ * @param addr2 pointer address of the second memory operation
+ * @param mode2 the mode of the accessed data through addr2
+ *
+ * @return found memory relation
*/
static ir_alias_relation _get_alias_relation(
- ir_graph *irg,
- ir_node *adr1, ir_mode *mode1,
- ir_node *adr2, ir_mode *mode2)
+ const ir_node *adr1, const ir_mode *mode1,
+ const ir_node *adr2, const ir_mode *mode2)
{
- ir_opcode op1, op2;
- ir_entity *ent1, *ent2;
- unsigned options;
+ ir_entity *ent1, *ent2;
+ unsigned options;
+ long offset1 = 0;
+ long offset2 = 0;
+ const ir_node *base1;
+ const ir_node *base2;
+ const ir_node *orig_adr1 = adr1;
+ const ir_node *orig_adr2 = adr2;
+ ir_graph *irg;
+ unsigned mode_size;
+ ir_storage_class_class_t class1, class2, mod1, mod2;
+ int have_const_offsets;
if (! get_opt_alias_analysis())
- return may_alias;
+ return ir_may_alias;
if (adr1 == adr2)
- return sure_alias;
+ return ir_sure_alias;
+ irg = get_irn_irg(adr1);
options = get_irg_memory_disambiguator_options(irg);
/* The Armageddon switch */
if (options & aa_opt_no_alias)
- return no_alias;
-
- /* Two save some code, sort the addresses by its id's. Beware, this
- might break some things, so better check here. */
- assert(iro_SymConst < iro_Sel && iro_Sel < iro_Proj && "Code dependence broken");
- op1 = get_irn_opcode(adr1);
- op2 = get_irn_opcode(adr2);
-
- if (op1 > op2) {
- ir_node *t = adr1;
- ir_mode *m = mode1;
- adr1 = adr2;
- mode1 = mode2;
- adr2 = t;
- mode2 = m;
- }
-
- if (is_global_var(adr1)) {
- /* first address is a global variable */
-
- if (is_global_var(adr2)) {
- /* both addresses are global variables and we know
- they are different (R1 a) */
- if (get_SymConst_entity(adr1) != get_SymConst_entity(adr2))
- return no_alias;
- else {
- /* equal entity addresses */
- return sure_alias;
- }
+ return ir_no_alias;
+
+ /* do the addresses have constants offsets?
+ * Note: nodes are normalized to have constants at right inputs,
+ * sub X, C is normalized to add X, -C
+ */
+ have_const_offsets = 1;
+ while (is_Add(adr1)) {
+ ir_node *add_right = get_Add_right(adr1);
+ if (is_Const(add_right) && !mode_is_reference(get_irn_mode(add_right))) {
+ ir_tarval *tv = get_Const_tarval(add_right);
+ offset1 += get_tarval_long(tv);
+ adr1 = get_Add_left(adr1);
+ } else if (mode_is_reference(get_irn_mode(add_right))) {
+ adr1 = add_right;
+ have_const_offsets = 0;
+ } else {
+ adr1 = get_Add_left(adr1);
+ have_const_offsets = 0;
}
- if (is_Sel(adr2)) {
- ir_node *base2 = find_base_adr(adr2, &ent2);
-
- if (is_global_var(base2)) {
- /* base2 address is a global var (R1 a) */
- if (adr1 != base2)
- return no_alias;
- } else if (base2 == get_irg_frame(irg)) {
- /* the second one is a local variable so they are always
- different (R1 b) */
- return no_alias;
- } else if (base2 == get_irg_tls(irg)) {
- /* the second one is a TLS variable so they are always
- different (R1 c) */
- return no_alias;
- }
+ }
+ while (is_Add(adr2)) {
+ ir_node *add_right = get_Add_right(adr2);
+ if (is_Const(add_right) && !mode_is_reference(get_irn_mode(add_right))) {
+ ir_tarval *tv = get_Const_tarval(add_right);
+ offset2 += get_tarval_long(tv);
+ adr2 = get_Add_left(adr2);
+ } else if (mode_is_reference(get_irn_mode(add_right))) {
+ adr2 = add_right;
+ have_const_offsets = 0;
+ } else {
+ adr2 = get_Add_left(adr2);
+ have_const_offsets = 0;
}
+ }
- /* Here we are: the first is a global var, the second some pointer. */
- ent1 = get_SymConst_entity(adr1);
- 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;
+ mode_size = get_mode_size_bytes(mode1);
+ if (get_mode_size_bytes(mode2) > mode_size) {
+ mode_size = get_mode_size_bytes(mode2);
+ }
+
+ /* same base address -> compare offsets if possible.
+ * FIXME: type long is not sufficient for this task ...
+ */
+ if (adr1 == adr2 && have_const_offsets) {
+ if ((unsigned long)labs(offset2 - offset1) >= mode_size)
+ return ir_no_alias;
+ else
+ return ir_sure_alias;
+ }
+
+ /*
+ * Bitfields can be constructed as Sels from its base address.
+ * As they have different entities, the disambiguator would find that they are
+ * alias free. While this is true for its values, it is false for the addresses
+ * (strictly speaking, the Sel's are NOT the addresses of the bitfields).
+ * So, skip those bitfield selecting Sel's.
+ */
+ adr1 = skip_Bitfield_Sels(adr1);
+ adr2 = skip_Bitfield_Sels(adr2);
+
+ /* skip Sels */
+ base1 = adr1;
+ base2 = adr2;
+ ent1 = NULL;
+ ent2 = NULL;
+ if (is_Sel(adr1)) {
+ base1 = find_base_adr(adr1, &ent1);
+ }
+ if (is_Sel(adr2)) {
+ base2 = find_base_adr(adr2, &ent2);
+ }
+
+ /* same base address -> compare Sel entities */
+ if (base1 == base2 && ent1 != NULL && ent2 != NULL) {
+ if (ent1 != ent2)
+ return ir_no_alias;
+ else if (have_const_offsets)
+ return different_sel_offsets(adr1, adr2);
+ }
+
+ mod1 = classify_pointer(base1, ent1);
+ mod2 = classify_pointer(base2, ent2);
+
+ class1 = get_base_sc(mod1);
+ class2 = get_base_sc(mod2);
+
+ /* struct-access cannot alias with variables */
+ if (ent1 == NULL && ent2 != NULL && is_compound_type(get_entity_owner(ent2))
+ && (class1 == ir_sc_globalvar || class1 == ir_sc_localvar || class1 == ir_sc_tls || class1 == ir_sc_globaladdr)) {
+ return ir_no_alias;
+ }
+ if (ent2 == NULL && ent1 != NULL && is_compound_type(get_entity_owner(ent1))
+ && (class2 == ir_sc_globalvar || class2 == ir_sc_localvar || class2 == ir_sc_tls || class2 == ir_sc_globaladdr)) {
+ return ir_no_alias;
+ }
+
+ if (class1 == ir_sc_pointer || class2 == ir_sc_pointer) {
+ /* swap pointer class to class1 */
+ if (class2 == ir_sc_pointer) {
+ ir_storage_class_class_t temp = mod1;
+ mod1 = mod2;
+ mod2 = temp;
+ class1 = get_base_sc(mod1);
+ class2 = get_base_sc(mod2);
}
- } else if (is_Sel(adr1)) {
- /* the first address is a Sel */
- ir_node *base1 = find_base_adr(adr1, &ent1);
-
- if (base1 == get_irg_frame(irg)) {
- /* 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) {
- /* identical bases: both are local variables */
- if (ent1 != ent2) {
- /* both addresses are local variables and we know
- they are different (R1 a) */
- return no_alias;
- } else {
- /* same local var */
- return different_sel_offsets(adr1, adr2);
- }
- } else if (base2 == get_irg_tls(irg)) {
- /* 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) */
- 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 */
- if (is_Sel(adr2)) {
- /* the second address is a Sel */
- ir_node *base2 = find_base_adr(adr2, &ent2);
-
- if (base1 == base2)
- if (ent1 != ent2) {
- /* both addresses are tls variables and we know
- they are different (R1 a) */
- } else {
- /* same tls var */
- return different_sel_offsets(adr1, adr2);
- }
- 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_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_global_var(base1)) {
- /* the first one is a global variable */
- ent1 = get_SymConst_entity(base1);
- if (is_Sel(adr2)) {
- /* the second address is a Sel */
- ir_node *base2 = find_base_adr(adr2, &ent2);
-
- if (base1 == base2) {
- /* same global var */
- return different_sel_offsets(adr1, adr2);
- }
- else if (base2 == get_irg_frame(irg)) {
- /* the second one is a local variable so they are always
- different (R1 a) */
- return no_alias;
- } else if (base2 == get_irg_tls(irg)) {
- /* 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). */
- return no_alias;
- }
- } else if (is_global_var(base2)) {
- ent2 = get_SymConst_entity(base2);
- /* both addresses are global variables and we know
- they are different (R1 a) */
- if (ent1 != ent2)
- return no_alias;
- }
- }
+ /* a pointer and an object whose address was never taken */
+ if (mod2 & ir_sc_modifier_nottaken) {
+ return ir_no_alias;
}
+ if (mod1 & ir_sc_modifier_argument) {
+ if ( (options & aa_opt_no_alias_args)
+ && (mod2 & ir_sc_modifier_argument))
+ return ir_no_alias;
+ if ( (options & aa_opt_no_alias_args_global)
+ && (class2 == ir_sc_globalvar
+ || class2 == ir_sc_tls
+ || class2 == ir_sc_globaladdr))
+ return ir_no_alias;
+ }
+ } else if (class1 != class2) {
+ /* two objects from different memory spaces */
+ return ir_no_alias;
} 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;
+ /* both classes are equal */
+ if (class1 == ir_sc_globalvar) {
+ ir_entity *entity1 = get_SymConst_entity(base1);
+ ir_entity *entity2 = get_SymConst_entity(base2);
+ if (entity1 != entity2)
+ return ir_no_alias;
+
+ /* for some reason CSE didn't happen yet for the 2 SymConsts... */
+ return ir_may_alias;
+ } else if (class1 == ir_sc_globaladdr) {
+ ir_tarval *tv = get_Const_tarval(base1);
+ offset1 += get_tarval_long(tv);
+ tv = get_Const_tarval(base2);
+ offset2 += get_tarval_long(tv);
+
+ if ((unsigned long)labs(offset2 - offset1) >= mode_size)
+ return ir_no_alias;
+ else
+ return ir_sure_alias;
+ }
}
-
- if (options & aa_opt_type_based) { /* Type based alias analysis */
+ /* Type based alias analysis */
+ if (options & aa_opt_type_based) {
ir_alias_relation rel;
if (options & aa_opt_byte_type_may_alias) {
if (get_mode_size_bits(mode1) == 8 || get_mode_size_bits(mode2) == 8) {
- /* One of the modes address a byte. Assume a may_alias and leave
+ /* One of the modes address a byte. Assume a ir_may_alias and leave
the type based check. */
goto leave_type_based_alias;
}
}
/* cheap check: If the mode sizes did not match, the types MUST be different */
if (get_mode_size_bits(mode1) != get_mode_size_bits(mode2))
- return no_alias;
+ return ir_no_alias;
/* cheap test: if only one is a reference mode, no alias */
if (mode_is_reference(mode1) != mode_is_reference(mode2))
- return no_alias;
+ return ir_no_alias;
+
+ /* cheap test: if arithmetic is different, no alias */
+ if (get_mode_arithmetic(mode1) != get_mode_arithmetic(mode2))
+ return ir_no_alias;
/* try rule R5 */
- rel = different_types(adr1, adr2);
- if (rel != may_alias)
+ rel = different_types(orig_adr1, orig_adr2);
+ if (rel != ir_may_alias)
return rel;
leave_type_based_alias:;
}
/* do we have a language specific memory disambiguator? */
- if (language_disambuigator) {
- ir_alias_relation rel = (*language_disambuigator)(irg, adr1, mode1, adr2, mode2);
- if (rel != may_alias)
+ if (language_disambuigator != NULL) {
+ ir_alias_relation rel = language_disambuigator(orig_adr1, mode1, orig_adr2, mode2);
+ if (rel != ir_may_alias)
return rel;
}
/* access points-to information here */
- return may_alias;
-} /* _get_alias_relation */
+ return ir_may_alias;
+}
-/*
- * Determine the alias relation between two addresses.
- */
ir_alias_relation get_alias_relation(
- ir_graph *irg,
- ir_node *adr1, ir_mode *mode1,
- ir_node *adr2, ir_mode *mode2)
+ const ir_node *adr1, const ir_mode *mode1,
+ const ir_node *adr2, const ir_mode *mode2)
{
- ir_alias_relation rel = _get_alias_relation(irg, adr1, mode1, adr2, mode2);
- DB((dbg, LEVEL_1, "alias(%+F, %+f) = %s\n", adr1, adr2, get_ir_alias_relation_name(rel)));
+ ir_alias_relation rel = _get_alias_relation(adr1, mode1, adr2, mode2);
+ DB((dbg, LEVEL_1, "alias(%+F, %+F) = %s\n", adr1, adr2, get_ir_alias_relation_name(rel)));
return rel;
-} /* get_alias_relation */
+}
-/* Set a source language specific memory disambiguator function. */
-void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) {
+void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func)
+{
language_disambuigator = func;
-} /* set_language_memory_disambiguator */
+}
/** The result cache for the memory disambiguator. */
static set *result_cache = NULL;
/** An entry in the relation cache. */
typedef struct mem_disambig_entry {
- ir_node *adr1; /**< The first address. */
- ir_node *adr2; /**< The second address. */
+ const ir_node *adr1; /**< The first address. */
+ const ir_mode *mode1; /**< The first address mode. */
+ const ir_node *adr2; /**< The second address. */
+ const ir_mode *mode2; /**< The second address mode. */
ir_alias_relation result; /**< The alias relation result. */
} mem_disambig_entry;
-#define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2))
+#define HASH_ENTRY(adr1, adr2) (hash_ptr(adr1) ^ hash_ptr(adr2))
/**
* Compare two relation cache entries.
*/
-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;
+static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size)
+{
+ const mem_disambig_entry *p1 = (const mem_disambig_entry*) elt;
+ const mem_disambig_entry *p2 = (const mem_disambig_entry*) key;
(void) size;
- return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2;
-} /* cmp_mem_disambig_entry */
+ return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2 &&
+ p1->mode1 == p2->mode1 && p1->mode2 == p2->mode2;
+}
-/**
- * Initialize the relation cache.
- */
-void mem_disambig_init(void) {
+void mem_disambig_init(void)
+{
result_cache = new_set(cmp_mem_disambig_entry, 8);
-} /* mem_disambig_init */
+}
-/*
- * Determine the alias relation between two addresses.
- */
ir_alias_relation get_alias_relation_ex(
- ir_graph *irg,
- ir_node *adr1, ir_mode *mode1,
- ir_node *adr2, ir_mode *mode2)
+ const ir_node *adr1, const ir_mode *mode1,
+ const ir_node *adr2, const ir_mode *mode2)
{
mem_disambig_entry key, *entry;
+ ir_fprintf(stderr, "%+F <-> %+F\n", adr1, adr2);
+
if (! get_opt_alias_analysis())
- return may_alias;
+ return ir_may_alias;
if (get_irn_opcode(adr1) > get_irn_opcode(adr2)) {
- ir_node *t = adr1;
+ const ir_node *t = adr1;
adr1 = adr2;
adr2 = t;
}
- key.adr1 = adr1;
- key.adr2 = adr2;
- entry = set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
- if (entry)
+ key.adr1 = adr1;
+ key.adr2 = adr2;
+ key.mode1 = mode1;
+ key.mode2 = mode2;
+ entry = set_find(mem_disambig_entry, result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
+ if (entry != NULL)
return entry->result;
- key.result = get_alias_relation(irg, adr1, mode1, adr2, mode2);
+ key.result = get_alias_relation(adr1, mode1, adr2, mode2);
- set_insert(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
+ (void)set_insert(mem_disambig_entry, result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
return key.result;
-} /* get_alias_relation_ex */
+}
-/* Free the relation cache. */
-void mem_disambig_term(void) {
- if (result_cache) {
+void mem_disambig_term(void)
+{
+ if (result_cache != NULL) {
del_set(result_cache);
result_cache = NULL;
}
-} /* mem_disambig_term */
+}
/**
* Check the mode of a Load/Store with the mode of the entity
*
* @return non-zero if the Load/Store is a hidden cast, zero else
*/
-static int is_hidden_cast(ir_mode *mode, ir_mode *ent_mode) {
+static int is_hidden_cast(const ir_mode *mode, const ir_mode *ent_mode)
+{
+ if (ent_mode == NULL)
+ return false;
+
if (ent_mode != mode) {
if (ent_mode == NULL ||
get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) ||
- get_mode_sort(ent_mode) != get_mode_sort(mode) ||
get_mode_arithmetic(ent_mode) != irma_twos_complement ||
get_mode_arithmetic(mode) != irma_twos_complement)
- return 1;
+ return true;
}
- return 0;
-} /* is_hidden_cast */
+ return false;
+}
/**
- * Determine the address_taken state of a node (or it's successor Sels).
+ * Determine the usage state of a node (or its successor Sels).
*
* @param irn the node
*/
-static ir_address_taken_state find_address_taken_state(ir_node *irn) {
- int i, j;
- ir_mode *emode, *mode;
- ir_node *value;
- ir_entity *ent;
+static ir_entity_usage determine_entity_usage(const ir_node *irn, ir_entity *entity)
+{
+ int i;
+ ir_mode *emode, *mode;
+ ir_node *value;
+ ir_type *tp;
+ unsigned res = 0;
for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) {
ir_node *succ = get_irn_out(irn, i);
switch (get_irn_opcode(succ)) {
case iro_Load:
+ /* beware: irn might be a Id node here, so irn might be not
+ equal to get_Load_ptr(succ) */
+ res |= ir_usage_read;
+
/* check if this load is not a hidden conversion */
- mode = get_Load_mode(succ);
- ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
- emode = get_type_mode(get_entity_type(ent));
+ mode = get_Load_mode(succ);
+ emode = get_type_mode(get_entity_type(entity));
if (is_hidden_cast(mode, emode))
- return ir_address_taken;
+ res |= ir_usage_reinterpret_cast;
break;
case iro_Store:
/* check that the node is not the Store's value */
- value = get_Store_value(succ);
- if (value == irn)
- return ir_address_taken;
- /* check if this Store is not a hidden conversion */
- mode = get_irn_mode(value);
- ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
- emode = get_type_mode(get_entity_type(ent));
- if (is_hidden_cast(mode, emode))
- return ir_address_taken;
+ if (irn == get_Store_value(succ)) {
+ res |= ir_usage_unknown;
+ }
+ if (irn == get_Store_ptr(succ)) {
+ res |= ir_usage_write;
+
+ /* check if this Store is not a hidden conversion */
+ value = get_Store_value(succ);
+ mode = get_irn_mode(value);
+ emode = get_type_mode(get_entity_type(entity));
+ if (is_hidden_cast(mode, emode))
+ res |= ir_usage_reinterpret_cast;
+ }
+ assert(irn != get_Store_mem(succ));
break;
+ case iro_CopyB:
+ /* CopyB are like Loads/Stores */
+ tp = get_entity_type(entity);
+ if (tp != get_CopyB_type(succ)) {
+ /* bad, different types, might be a hidden conversion */
+ res |= ir_usage_reinterpret_cast;
+ }
+ if (irn == get_CopyB_dst(succ)) {
+ res |= ir_usage_write;
+ } else {
+ assert(irn == get_CopyB_src(succ));
+ res |= ir_usage_read;
+ }
+ break;
+
+ case iro_Add:
+ case iro_Sub:
+ /* Check the successor of irn. */
+ res |= determine_entity_usage(succ, entity);
+ break;
case iro_Sel: {
+ ir_entity *sel_entity = get_Sel_entity(succ);
+ /* this analysis can't handle unions correctly */
+ if (is_Union_type(get_entity_owner(sel_entity))) {
+ res |= ir_usage_unknown;
+ break;
+ }
/* Check the successor of irn. */
- ir_address_taken_state res = find_address_taken_state(succ);
- if (res != ir_address_not_taken)
- return res;
+ res |= determine_entity_usage(succ, sel_entity);
break;
}
case iro_Call:
- /* Only the call address is not an address taker but
- this is an uninteresting case, so we ignore it here. */
- 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;
+ if (irn == get_Call_ptr(succ)) {
+ /* TODO: we could check for reinterpret casts here...
+ * But I doubt anyone is interested in that bit for
+ * function entities and I'm too lazy to write the code now.
+ */
+ res |= ir_usage_read;
+ } else {
+ assert(irn != get_Call_mem(succ));
+ res |= ir_usage_unknown;
+ }
+ break;
+
+ /* skip identities */
+ case iro_Id:
+ res |= determine_entity_usage(succ, entity);
+ break;
+
+ /* skip tuples */
+ case iro_Tuple: {
+ int input_nr;
+ for (input_nr = get_Tuple_n_preds(succ) - 1; input_nr >= 0;
+ --input_nr) {
+ ir_node *pred = get_Tuple_pred(succ, input_nr);
+ if (pred == irn) {
+ int k;
+ /* we found one input */
+ for (k = get_irn_n_outs(succ) - 1; k >= 0; --k) {
+ ir_node *proj = get_irn_out(succ, k);
+
+ if (is_Proj(proj) && get_Proj_proj(proj) == input_nr) {
+ res |= determine_entity_usage(proj, entity);
+ break;
+ }
+ }
+ }
}
break;
+ }
default:
- /* another op, the address may be taken */
- return ir_address_taken_unknown;
+ /* another op, we don't know anything (we could do more advanced
+ * things like a dataflow analysis here) */
+ res |= ir_usage_unknown;
+ break;
}
}
- /* All successors finished, the address is not taken. */
- return ir_address_not_taken;
-} /* find_address_taken_state */
+
+ return (ir_entity_usage) res;
+}
/**
- * Update the "address taken" flag of all frame entities.
+ * Update the usage flags of all frame entities.
*/
-static void analyse_irg_address_taken(ir_graph *irg) {
+static void analyse_irg_entity_usage(ir_graph *irg)
+{
ir_type *ft = get_irg_frame_type(irg);
ir_node *irg_frame;
- int i;
+ size_t i, n;
+ int j, k, static_link_arg;
+
+ assure_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
/* set initial state to not_taken, as this is the "smallest" state */
- for (i = get_class_n_members(ft) - 1; i >= 0; --i) {
+ for (i = 0, n = get_class_n_members(ft); i < n; ++i) {
ir_entity *ent = get_class_member(ft, i);
- set_entity_address_taken(ent, ir_address_not_taken);
+ /* methods can only be analyzed globally */
+ if (! is_method_entity(ent)) {
+ ir_entity_usage flags = ir_usage_none;
+ if (get_entity_linkage(ent) & IR_LINKAGE_HIDDEN_USER)
+ flags = ir_usage_unknown;
+ set_entity_usage(ent, flags);
+ }
}
- assure_irg_outs(irg);
-
irg_frame = get_irg_frame(irg);
- for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
- ir_node *succ = get_irn_out(irg_frame, i);
- ir_address_taken_state state;
+ for (j = get_irn_n_outs(irg_frame) - 1; j >= 0; --j) {
+ ir_node *succ = get_irn_out(irg_frame, j);
+ ir_entity *entity;
+ unsigned flags;
- if (is_Sel(succ)) {
- ir_entity *ent = get_Sel_entity(succ);
+ if (!is_Sel(succ))
+ continue;
- if (get_entity_address_taken(ent) == ir_address_taken)
- continue;
+ entity = get_Sel_entity(succ);
+ flags = get_entity_usage(entity);
+ flags |= determine_entity_usage(succ, entity);
+ set_entity_usage(entity, (ir_entity_usage) flags);
+ }
+
+ /* check inner functions accessing outer frame */
+ static_link_arg = 0;
+ for (i = 0, n = get_class_n_members(ft); i < n; ++i) {
+ ir_entity *ent = get_class_member(ft, i);
+ ir_graph *inner_irg;
+ ir_node *args;
+
+ if (! is_method_entity(ent))
+ continue;
+
+ inner_irg = get_entity_irg(ent);
+ if (inner_irg == NULL)
+ continue;
+
+ assure_irg_outs(inner_irg);
+ args = get_irg_args(inner_irg);
+ for (j = get_irn_n_outs(args) - 1; j >= 0; --j) {
+ ir_node *arg = get_irn_out(args, j);
+
+ if (get_Proj_proj(arg) == static_link_arg) {
+ for (k = get_irn_n_outs(arg) - 1; k >= 0; --k) {
+ ir_node *succ = get_irn_out(arg, k);
+
+ if (is_Sel(succ)) {
+ ir_entity *entity = get_Sel_entity(succ);
- state = find_address_taken_state(succ);
- if (state > get_entity_address_taken(ent))
- set_entity_address_taken(ent, state);
+ if (get_entity_owner(entity) == ft) {
+ /* found an access to the outer frame */
+ unsigned flags;
+
+ flags = get_entity_usage(entity);
+ flags |= determine_entity_usage(succ, entity);
+ set_entity_usage(entity, (ir_entity_usage) flags);
+ }
+ }
+ }
+ }
}
}
- /* now computed */
- irg->adr_taken_state = ir_address_taken_computed;
-} /* analyse_address_taken */
-/* Returns the current address taken state of the graph. */
-ir_address_taken_computed_state get_irg_address_taken_state(const ir_graph *irg) {
- return irg->adr_taken_state;
-} /* get_irg_address_taken_state */
+ /* now computed */
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_ENTITY_USAGE);
+}
-/* Sets the current address taken state of the graph. */
-void set_irg_address_taken_state(ir_graph *irg, ir_address_taken_computed_state state) {
- irg->adr_taken_state = state;
-} /* set_irg_address_taken_state */
+void assure_irg_entity_usage_computed(ir_graph *irg)
+{
+ if (irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_ENTITY_USAGE))
+ return;
-/* Assure that the address taken flag is computed for the given graph. */
-void assure_irg_address_taken_computed(ir_graph *irg) {
- if (irg->adr_taken_state == ir_address_taken_not_computed)
- analyse_irg_address_taken(irg);
-} /* assure_irg_address_taken_computed */
+ analyse_irg_entity_usage(irg);
+}
/**
- * Initialize the address_taken flag for a global type like type.
+ * Initialize the entity_usage flag for a global type like type.
*/
-static void init_taken_flag(ir_type * tp) {
- int i;
+static void init_entity_usage(ir_type *tp)
+{
+ size_t i, n;
- /* All external visible entities are at least
- ir_address_taken_unknown. This is very conservative. */
- for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
- ir_entity *ent = get_compound_member(tp, i);
- ir_address_taken_state state;
+ /* We have to be conservative: All external visible entities are unknown */
+ for (i = 0, n = get_compound_n_members(tp); i < n; ++i) {
+ ir_entity *ent = get_compound_member(tp, i);
+ unsigned flags = ir_usage_none;
- state = get_entity_visibility(ent) == visibility_external_visible ?
- ir_address_taken_unknown : ir_address_not_taken ;
- set_entity_address_taken(ent, state);
+ if (entity_is_externally_visible(ent)) {
+ flags |= ir_usage_unknown;
+ }
+ set_entity_usage(ent, (ir_entity_usage) flags);
}
-} /* init_taken_flag */
+}
/**
- * Mark all entities used in the initializer for the given entity as address taken
+ * Mark all entities used in the initializer as unknown usage.
+ *
+ * @param initializer the initializer to check
*/
-static void check_initializer(ir_entity *ent) {
+static void check_initializer_nodes(ir_initializer_t *initializer)
+{
+ size_t i;
ir_node *n;
- int i;
- /* do not check uninitialized values */
- if (get_entity_variability(ent) == variability_uninitialized)
+ switch (initializer->kind) {
+ case IR_INITIALIZER_CONST:
+ /* let's check if it's an address */
+ n = initializer->consti.value;
+ if (is_SymConst_addr_ent(n)) {
+ ir_entity *ent = get_SymConst_entity(n);
+ set_entity_usage(ent, ir_usage_unknown);
+ }
+ return;
+ case IR_INITIALIZER_TARVAL:
+ case IR_INITIALIZER_NULL:
return;
+ case IR_INITIALIZER_COMPOUND:
+ for (i = 0; i < initializer->compound.n_initializers; ++i) {
+ ir_initializer_t *sub_initializer
+ = initializer->compound.initializers[i];
+ check_initializer_nodes(sub_initializer);
+ }
+ return;
+ }
+ panic("invalid initializer found");
+}
- /* Beware: Methods initialized with "themself". This does not count as a taken
- address. */
+/**
+ * Mark all entities used in the initializer for the given entity as unknown
+ * usage.
+ *
+ * @param ent the entity
+ */
+static void check_initializer(ir_entity *ent)
+{
+ /* Beware: Methods are always initialized with "themself". This does not
+ * count as a taken address.
+ * TODO: this initialisation with "themself" is wrong and should be removed
+ */
if (is_Method_type(get_entity_type(ent)))
return;
- if (is_atomic_entity(ent)) {
- /* let's check if it's an address */
- n = get_atomic_ent_value(ent);
- if (is_SymConst(n) && get_SymConst_kind(n) == symconst_addr_ent) {
- ir_entity *ent = get_SymConst_entity(n);
- set_entity_address_taken(ent, ir_address_taken);
- }
- } else {
- for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i) {
- n = get_compound_ent_value(ent, i);
-
- /* let's check if it's an address */
- if (is_SymConst(n) && get_SymConst_kind(n) == symconst_addr_ent) {
- ir_entity *ent = get_SymConst_entity(n);
- set_entity_address_taken(ent, ir_address_taken);
- }
- }
+ if (ent->initializer != NULL) {
+ check_initializer_nodes(ent->initializer);
}
-} /* check_initializer */
+}
/**
- * Mark all entities used in initializers as address taken
+ * Mark all entities used in initializers as unknown usage.
+ *
+ * @param tp a compound type
*/
-static void check_initializers(ir_type *tp) {
- int i;
+static void check_initializers(ir_type *tp)
+{
+ size_t i, n;
- for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
+ for (i = 0, n = get_compound_n_members(tp); i < n; ++i) {
ir_entity *ent = get_compound_member(tp, i);
check_initializer(ent);
}
-} /* check_initializers */
+}
#ifdef DEBUG_libfirm
/**
- * Print the address taken state of all entities of a given type for debugging.
+ * Print the entity usage flags of all entities of a given type for debugging.
+ *
+ * @param tp a compound type
*/
-static void print_address_taken_state(ir_type *tp) {
- int i;
- for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
+static void print_entity_usage_flags(const ir_type *tp)
+{
+ size_t i, n;
+ for (i = 0, n = get_compound_n_members(tp); i < n; ++i) {
ir_entity *ent = get_compound_member(tp, i);
- ir_address_taken_state state = get_entity_address_taken(ent);
-
- if (state != ir_address_not_taken) {
- assert(ir_address_not_taken <= (int) state && state <= ir_address_taken);
- ir_printf("%+F: %s\n", ent, get_address_taken_state_name(state));
- }
+ ir_entity_usage flags = get_entity_usage(ent);
+
+ if (flags == 0)
+ continue;
+ ir_printf("%+F:", ent);
+ if (flags & ir_usage_address_taken)
+ printf(" address_taken");
+ if (flags & ir_usage_read)
+ printf(" read");
+ if (flags & ir_usage_write)
+ printf(" write");
+ if (flags & ir_usage_reinterpret_cast)
+ printf(" reinterp_cast");
+ printf("\n");
}
-} /* print_address_taken_state */
+}
#endif /* DEBUG_libfirm */
/**
* Post-walker: check for global entity address
*/
-static void check_global_address(ir_node *irn, void *env) {
- ir_node *tls = env;
+static void check_global_address(ir_node *irn, void *data)
+{
ir_entity *ent;
- ir_address_taken_state state;
+ unsigned flags;
+ (void) data;
- if (is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent) {
+ if (is_SymConst_addr_ent(irn)) {
/* A global. */
ent = get_SymConst_entity(irn);
- } else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) {
- /* A TLS variable. */
- ent = get_Sel_entity(irn);
} else
return;
- if (get_entity_address_taken(ent) >= ir_address_taken) {
- /* Already at the maximum. */
- return;
- }
- state = find_address_taken_state(irn);
- if (state > get_entity_address_taken(ent))
- set_entity_address_taken(ent, state);
-} /* check_global_address */
+ flags = get_entity_usage(ent);
+ flags |= determine_entity_usage(irn, ent);
+ set_entity_usage(ent, (ir_entity_usage) flags);
+}
/**
- * Update the "address taken" flag of all global entities.
+ * Update the entity usage flags of all global entities.
*/
-static void analyse_irp_globals_address_taken(void) {
- int i;
-
- FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
+static void analyse_irp_globals_entity_usage(void)
+{
+ size_t i, n;
+ ir_segment_t s;
- init_taken_flag(get_glob_type());
- init_taken_flag(get_tls_type());
+ for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) {
+ ir_type *type = get_segment_type(s);
+ init_entity_usage(type);
+ }
- check_initializers(get_glob_type());
- check_initializers(get_tls_type());
+ for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) {
+ ir_type *type = get_segment_type(s);
+ check_initializers(type);
+ }
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
ir_graph *irg = get_irp_irg(i);
assure_irg_outs(irg);
- irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg));
+ irg_walk_graph(irg, NULL, check_global_address, NULL);
}
#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());
+ for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) {
+ print_entity_usage_flags(get_segment_type(s));
+ }
}
#endif /* DEBUG_libfirm */
/* now computed */
- irp->globals_adr_taken_state = ir_address_taken_computed;
-} /* analyse_irp_globals_address_taken */
+ irp->globals_entity_usage_state = ir_entity_usage_computed;
+}
-/* Returns the current address taken state of the globals. */
-ir_address_taken_computed_state get_irp_globals_address_taken_state(void) {
- return irp->globals_adr_taken_state;
-} /* get_irp_globals_address_taken_state */
+ir_entity_usage_computed_state get_irp_globals_entity_usage_state(void)
+{
+ return irp->globals_entity_usage_state;
+}
-/* Sets the current address taken state of the graph. */
-void set_irp_globals_address_taken_state(ir_address_taken_computed_state state) {
- irp->globals_adr_taken_state = state;
-} /* set_irg_address_taken_state */
+void set_irp_globals_entity_usage_state(ir_entity_usage_computed_state state)
+{
+ irp->globals_entity_usage_state = state;
+}
-/* Assure that the address taken flag is computed for the globals. */
-void assure_irp_globals_address_taken_computed(void) {
- if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
- analyse_irp_globals_address_taken();
-} /* assure_irp_globals_address_taken_computed */
+void assure_irp_globals_entity_usage_computed(void)
+{
+ if (irp->globals_entity_usage_state != ir_entity_usage_not_computed)
+ return;
+ analyse_irp_globals_entity_usage();
+}
-#include <adt/pmap.h>
-#include "typerep.h"
+void firm_init_memory_disambiguator(void)
+{
+ FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
+ FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc");
+}
-DEBUG_ONLY(static firm_dbg_module_t *dbgcall = NULL;)
/** Maps method types to cloned method types. */
static pmap *mtp_map;
/**
* Clone a method type if not already cloned.
+ *
+ * @param tp the type to clone
*/
-static ir_type *clone_type_and_cache(ir_type *tp) {
- static ident *prefix = NULL;
- ir_type *res;
- pmap_entry *e = pmap_find(mtp_map, tp);
-
- if (e)
- return e->value;
-
- if (prefix == NULL)
- prefix = new_id_from_chars("C", 1);
+static ir_type *clone_type_and_cache(ir_type *tp)
+{
+ ir_type *res = pmap_get(ir_type, mtp_map, tp);
- res = clone_type_method(tp, prefix);
- pmap_insert(mtp_map, tp, res);
+ if (res == NULL) {
+ res = clone_type_method(tp);
+ pmap_insert(mtp_map, tp, res);
+ }
return res;
-} /* clone_type_and_cache */
+}
/**
- * Copy the calling conventions from the entities to the call type.
+ * Walker: clone all call types of Calls to methods having the
+ * mtp_property_private property set.
*/
-static void update_calls_to_private(ir_node *call, void *env) {
+static void update_calls_to_private(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 ((get_method_additional_properties(ctp) & mtp_property_private) == 0) {
- ctp = clone_type_and_cache(ctp);
- set_method_additional_property(ctp, mtp_property_private);
- set_Call_type(call, ctp);
- DB((dbgcall, LEVEL_1, "changed call to private method %+F\n", ent));
+ if (get_entity_additional_properties(ent) & mtp_property_private) {
+ if ((get_method_additional_properties(ctp) & mtp_property_private) == 0) {
+ ctp = clone_type_and_cache(ctp);
+ add_method_additional_properties(ctp, mtp_property_private);
+ set_Call_type(call, ctp);
+ DB((dbgcall, LEVEL_1, "changed call to private method %+F using cloned type %+F\n", ent, ctp));
+ }
}
}
}
-} /* update_calls_to_private */
+}
-/* Mark all private methods, i.e. those of which all call sites are known. */
-void mark_private_methods(void) {
- int i;
+void mark_private_methods(void)
+{
+ size_t i, n;
int changed = 0;
- FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc");
-
- assure_irp_globals_address_taken_computed();
+ assure_irp_globals_entity_usage_computed();
mtp_map = pmap_create();
/* 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);
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
+ ir_graph *irg = get_irp_irg(i);
+ ir_entity *ent = get_irg_entity(irg);
+ ir_entity_usage flags = get_entity_usage(ent);
- if (get_entity_visibility(ent) == visibility_local &&
- state == ir_address_not_taken) {
+ if (!(flags & ir_usage_address_taken) && !entity_is_externally_visible(ent)) {
ir_type *mtp = get_entity_type(ent);
- set_entity_additional_property(ent, mtp_property_private);
+ add_entity_additional_properties(ent, mtp_property_private);
+ DB((dbgcall, LEVEL_1, "found private method %+F\n", ent));
if ((get_method_additional_properties(mtp) & mtp_property_private) == 0) {
/* need a new type */
mtp = clone_type_and_cache(mtp);
+ add_method_additional_properties(mtp, mtp_property_private);
set_entity_type(ent, mtp);
- set_method_additional_property(mtp, mtp_property_private);
+ DB((dbgcall, LEVEL_2, "changed entity type of %+F to %+F\n", ent, mtp));
changed = 1;
}
- DB((dbgcall, LEVEL_1, "found private method %+F\n", ent));
}
}
all_irg_walk(NULL, update_calls_to_private, NULL);
pmap_destroy(mtp_map);
-} /* mark_private_methods */
+}
+
+ir_prog_pass_t *mark_private_methods_pass(const char *name)
+{
+ return def_prog_pass(name ? name : "mark_private_methods", mark_private_methods);
+}
projects / libfirm / blobdiff