/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
#include "irgwalk.h"
#include "irprintf.h"
#include "debug.h"
+#include "error.h"
/** The debug handle. */
DEBUG_ONLY(static firm_dbg_module_t *dbg = 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) {
+#define X(a) case a: return #a
+ switch (rel) {
+ X(ir_no_alias);
+ X(ir_may_alias);
+ X(ir_sure_alias);
+ default: assert(0); return "UNKNOWN";
+ }
+#undef X
+}
+
/* Get the memory disambiguator options for a graph. */
unsigned get_irg_memory_disambiguator_options(ir_graph *irg) {
unsigned opt = irg->mem_disambig_opt;
return ptr;
} /* find_base_adr */
-/**
- * Check if the address can be decomposed into base PLUS offset.
- */
-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);
-
- if (get_type_state(owner) != layout_fixed) {
- /* The layout is NOT fixed yet, symbolic evaluation needed */
- }
- }
- return 0;
-} /* has_offset */
-
-/**
- * Two address expressions have the same base address,
- * check if there offsets are different.
- *
- * @param adr1 The first address.
- * @param adr2 The second address.
- */
-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 */
-
/**
* Check if a given Const node is greater or equal a given size.
*
- * @return no_alias if the Const is greater, may_alias else
+ * @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;
if (size == 0)
- return classify_tarval(tv) != TV_CLASSIFY_NULL ? no_alias : may_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;
+ return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? ir_no_alias : ir_may_alias;
} /* check_const */
/**
* 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
+ * @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) {
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_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);
+ m2 = get_tarval_mode(tv2);
+ if (m1 != m2) {
+ int size = get_mode_size_bits(m1) - get_mode_size_bits(m2);
+
+ if (size < 0) {
+ /* m1 is a small mode, cast up */
+ 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 ir_may_alias;
+ }
+ tv1 = tarval_convert_to(tv1, m1);
+ } else if (size > 0) {
+ /* m2 is a small mode, cast up */
+ 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 ir_may_alias;
+ }
+ tv2 = tarval_convert_to(tv2, m2);
+ }
+ /* here the size should be identical, check for signed */
+ if (get_mode_sign(m1) != get_mode_sign(m2)) {
+ /* find the signed */
+ if (mode_is_signed(m2)) {
+ 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)) {
+ /* 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)) {
+ /* tv1 is negative and tv2 >= tv_size, so the difference is bigger than size */
+ return ir_no_alias;
+ }
+ /* tv_size > tv2, so we can subtract without overflow */
+ tv2 = tarval_sub(tv_size, tv2, NULL);
+
+ /* tv1 is < 0, so we can negate it */
+ tv1 = tarval_neg(tv1);
+
+ /* cast it into unsigned. for two-complement it does the right thing for MIN_INT */
+ tv1 = tarval_convert_to(tv1, m2);
+
+ /* now we can compare without overflow */
+ return tarval_cmp(tv1, tv2) & (pn_Cmp_Eq|pn_Cmp_Gt) ? ir_no_alias : ir_may_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 = 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) & (pn_Cmp_Eq|pn_Cmp_Lt) ? ir_no_alias : ir_may_alias;
}
/* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
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 (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) {
}
}
- return may_alias;
+ return ir_may_alias;
} /* different_index */
/**
- * Two Sel addresses have the same base address, check if there offsets are different.
+ * Two Sel addresses have the same base address, check if there 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 */
+ (void) sel1;
+ (void) sel2;
+#if 0
ir_entity *ent1 = get_Sel_entity(sel1);
ir_entity *ent2 = get_Sel_entity(sel2);
int i, check_arr = 0;
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) {
return have_no > 0 ? no_alias : sure_alias;
}
}
- return may_alias;
+#endif
+ return ir_may_alias;
} /* different_sel_offsets */
/**
{
ir_entity *ent1 = NULL, *ent2 = NULL;
- if (is_SymConst(adr1) && get_SymConst_kind(adr1) == symconst_addr_ent)
- ent1 = get_SymConst_entity(adr1);
+ if (is_Global(adr1))
+ ent1 = get_Global_entity(adr1);
else if (is_Sel(adr1))
ent1 = get_Sel_entity(adr1);
- if (is_SymConst(adr2) && get_SymConst_kind(adr2) == symconst_addr_ent)
- ent2 = get_SymConst_entity(adr2);
+ if (is_Global(adr2))
+ ent2 = get_Global_entity(adr2);
else if (is_Sel(adr2))
ent2 = get_Sel_entity(adr2);
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;
+ return ir_may_alias;
} /* different_types */
/**
- * 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(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_Global(node)) {
+ ir_entity *ent = get_Global_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 */
+} /* is_malloc_Result */
/**
- * Check if we can determine that the two pointers always have an offset bigger then size
+ * Classify a base pointer.
+ *
+ * @param irg the graph of the pointer
+ * @param irn the node representing the base address
+ * @param ent the base entity of the base address iff any
*/
-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(ir_graph *irg, ir_node *irn, ir_entity *ent)
+{
+ ir_storage_class_class_t res = ir_sc_pointer;
+ if (is_Global(irn)) {
+ ir_entity *entity = get_Global_entity(irn);
+ res = ir_sc_globalvar;
+ if (get_entity_address_taken(entity) == ir_address_not_taken)
+ res |= ir_sc_modifier_nottaken;
+ } else if (irn == get_irg_frame(irg)) {
+ res = ir_sc_localvar;
+ if (ent != NULL && get_entity_address_taken(ent) == ir_address_not_taken)
+ res |= ir_sc_modifier_nottaken;
+ } else if (is_arg_Proj(irn)) {
+ return ir_sc_argument;
+ } else if (irn == get_irg_tls(irg)) {
+ res = ir_sc_tls;
+ if (ent != NULL && get_entity_address_taken(ent) == ir_address_not_taken)
+ res |= ir_sc_modifier_nottaken;
+ } else if (is_Proj(irn) && is_malloc_Result(irn)) {
+ return ir_sc_malloced;
}
- 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 ir_node *skip_Bitfield_Sels(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.
ir_node *adr1, ir_mode *mode1,
ir_node *adr2, 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;
+ ir_node *base1;
+ ir_node *base2;
+ ir_node *orig_adr1 = adr1;
+ ir_node *orig_adr2 = adr2;
+ unsigned mode_size;
+ ir_storage_class_class_t class1, class2;
+ 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;
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 breaked");
- 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)) {
+ 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
- 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) */
- 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)) {
+ 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;
}
+ }
+
+ 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 it's 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);
+ }
- /* 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;
+ class1 = classify_pointer(irg, base1, ent1);
+ class2 = classify_pointer(irg, base2, ent2);
+
+ if (class1 == ir_sc_pointer) {
+ if (class2 & ir_sc_modifier_nottaken) {
+ return ir_no_alias;
+ } else {
+ return ir_may_alias;
}
- } 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: check for different offsets */
- return different_sel_offsets(adr1, adr2);
- } else if (base2 == get_irg_frame(irg)) {
- /* both addresses are local variables and we know
- they are different (R1 a) */
- if (ent1 != ent2)
- return no_alias;
- } 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)
- 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 d) */
- return no_alias;
- } else if (base2 == get_irg_tls(irg)) {
- /* both addresses are TLS variables and we know
- they are different (R1 a) */
- if (ent1 != ent2)
- 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)
- 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;
- }
- }
+ } else if (class2 == ir_sc_pointer) {
+ if (class1 & ir_sc_modifier_nottaken) {
+ return ir_no_alias;
+ } else {
+ return ir_may_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;
}
+ if (class1 != class2) {
+ return ir_no_alias;
+ }
+
+ 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;
+ }
- 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 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)
+ ir_alias_relation rel = (*language_disambuigator)(irg, orig_adr1, mode1, orig_adr2, mode2);
+ if (rel != ir_may_alias)
return rel;
}
/* access points-to information here */
- return may_alias;
+ return ir_may_alias;
} /* _get_alias_relation */
/*
ir_node *adr2, 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)));
return rel;
} /* get_alias_relation */
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 */
{
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;
* @param irn the node
*/
static ir_address_taken_state find_address_taken_state(ir_node *irn) {
- int i;
- ir_mode *emode, *mode;
- ir_node *value;
+ int i, j;
+ ir_mode *emode, *mode;
+ ir_node *value;
ir_entity *ent;
+ ir_type *tp;
for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) {
ir_node *succ = get_irn_out(irn, i);
return ir_address_taken;
break;
+ case iro_CopyB:
+ /* CopyB are like Loads/Stores */
+ ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
+ tp = get_entity_type(ent);
+ if (tp != get_CopyB_type(succ)) {
+ /* bad, different types, might be a hidden conversion */
+ return ir_address_taken;
+ }
+ break;
+
case iro_Sel: {
/* Check the successor of irn. */
ir_address_taken_state res = find_address_taken_state(succ);
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 */
analyse_irg_address_taken(irg);
} /* assure_irg_address_taken_computed */
+
/**
* Initialize the address_taken flag for a global type like type.
*/
}
} /* init_taken_flag */
+static void check_initializer_nodes(ir_initializer_t *initializer)
+{
+ switch (initializer->kind) {
+ case IR_INITIALIZER_CONST: {
+ ir_node *n = initializer->consti.value;
+
+ /* let's check if it's an address */
+ if (is_Global(n)) {
+ ir_entity *ent = get_Global_entity(n);
+ set_entity_address_taken(ent, ir_address_taken);
+ }
+ return;
+ }
+ case IR_INITIALIZER_TARVAL:
+ case IR_INITIALIZER_NULL:
+ return;
+ case IR_INITIALIZER_COMPOUND: {
+ size_t i;
+
+ 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 initialzier found");
+}
+
+/**
+ * Mark all entities used in the initializer for the given entity as address taken
+ */
+static void check_initializer(ir_entity *ent) {
+ ir_node *n;
+ int i;
+
+ /* do not check uninitialized values */
+ if (get_entity_variability(ent) == variability_uninitialized)
+ return;
+
+ /* Beware: Methods initialized with "themself". This does not count as a taken
+ address. */
+ if (is_Method_type(get_entity_type(ent)))
+ return;
+
+ if (ent->has_initializer) {
+ check_initializer_nodes(ent->attr.initializer);
+ } else if (is_atomic_entity(ent)) {
+ /* let's check if it's an address */
+ n = get_atomic_ent_value(ent);
+ if (is_Global(n)) {
+ ir_entity *ent = get_Global_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_Global(n)) {
+ ir_entity *ent = get_Global_entity(n);
+ set_entity_address_taken(ent, ir_address_taken);
+ }
+ }
+ }
+} /* check_initializer */
+
+
+/**
+ * Mark all entities used in initializers as address taken
+ */
+static void check_initializers(ir_type *tp) {
+ int i;
+
+ for (i = get_compound_n_members(tp) - 1; i >= 0; --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.
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));
}
}
ir_entity *ent;
ir_address_taken_state state;
- if (is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent) {
+ if (is_Global(irn)) {
/* A global. */
- ent = get_SymConst_entity(irn);
+ ent = get_Global_entity(irn);
} else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) {
/* A TLS variable. */
ent = get_Sel_entity(irn);
init_taken_flag(get_glob_type());
init_taken_flag(get_tls_type());
+ check_initializers(get_glob_type());
+ check_initializers(get_tls_type());
+
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
ir_graph *irg = get_irp_irg(i);
if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
analyse_irp_globals_address_taken();
} /* assure_irp_globals_address_taken_computed */
+
+
+#include <adt/pmap.h>
+#include "typerep.h"
+
+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.
+ */
+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);
+
+ res = clone_type_method(tp, prefix);
+ pmap_insert(mtp_map, tp, res);
+ DB((dbgcall, LEVEL_2, "cloned type %+F into %+F\n", tp, res));
+
+ return res;
+} /* clone_type_and_cache */
+
+/**
+ * Copy the calling conventions from the entities to the call type.
+ */
+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 *ctp = get_Call_type(call);
+
+ 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);
+ 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));
+ }
+ }
+ }
+ }
+} /* 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;
+ int changed = 0;
+
+ FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc");
+
+ assure_irp_globals_address_taken_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);
+
+ if (get_entity_visibility(ent) == visibility_local &&
+ state == ir_address_not_taken) {
+ ir_type *mtp = get_entity_type(ent);
+
+ set_entity_additional_property(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);
+ set_entity_type(ent, mtp);
+ set_method_additional_property(mtp, mtp_property_private);
+ changed = 1;
+ }
+ }
+ }
+
+ if (changed)
+ all_irg_walk(NULL, update_calls_to_private, NULL);
+
+ pmap_destroy(mtp_map);
+} /* mark_private_methods */
projects / libfirm / blobdiff