* @author Michael Beck
* @version $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
#include <adt/raw_bitset.h>
#include "irvrfy.h"
#include "dbginfo_t.h"
#include "irflag_t.h"
+#include "irloop_t.h"
#include "ircons.h"
#include "iredges_t.h"
#include "analyze_irg_args.h"
typedef struct _env_t {
unsigned n_calls_SymConst;
unsigned n_calls_Sel;
- ir_node *const_call_list; /**< The list of all const function calls that will be changed. */
- ir_node *pure_call_list; /**< The list of all pure function calls that will be changed. */
- ir_node *nothrow_call_list; /**< The list of all nothrow function calls that will be changed. */
- ir_node *proj_list; /**< The list of all potential Proj nodes that must be fixed. */
+ ir_node *float_const_call_list; /**< The list of all floating const function calls that will be changed. */
+ ir_node *nonfloat_const_call_list; /**< The list of all non-floating const function calls that will be changed. */
+ ir_node *pure_call_list; /**< The list of all pure function calls that will be changed. */
+ ir_node *nothrow_call_list; /**< The list of all nothrow function calls that will be changed. */
+ ir_node *proj_list; /**< The list of all potential Proj nodes that must be fixed. */
} env_t;
/** If non-null, evaluates entities for being a heap alloc. */
* to lists. Collect all Proj(Call) nodes into a Proj list.
*/
static void collect_const_and_pure_calls(ir_node *node, void *env) {
- env_t *ctx = env;
- ir_node *call, *ptr;
+ env_t *ctx = env;
+ ir_node *call, *ptr;
ir_entity *ent;
- unsigned prop;
+ unsigned and_prop, or_prop, prop;
if (is_Call(node)) {
call = node;
/* set the link to NULL for all non-const/pure calls */
set_irn_link(call, NULL);
ptr = get_Call_ptr(call);
- if (is_SymConst_addr_ent(ptr)) {
- ent = get_SymConst_entity(ptr);
+ if (is_Global(ptr)) {
+ ent = get_Global_entity(ptr);
prop = get_entity_additional_properties(ent);
if ((prop & (mtp_property_const|mtp_property_pure)) == 0)
}
/* note that const function are a subset of pure ones */
- prop = mtp_property_const | mtp_property_pure;
+ and_prop = mtp_property_const | mtp_property_pure;
+ or_prop = 0;
for (i = 0; i < n_callees; ++i) {
ent = get_Call_callee(call, i);
if (ent == unknown_entity) {
/* we don't know which entity is called here */
return;
}
- prop &= get_entity_additional_properties(ent);
- if (prop == mtp_no_property)
+ prop = get_entity_additional_properties(ent);
+ and_prop &= prop;
+ or_prop &= prop;
+ if (and_prop == mtp_no_property)
return;
}
+ prop = and_prop | (or_prop & mtp_property_has_loop);
++ctx->n_calls_Sel;
} else
return;
set_irn_link(call, ctx->pure_call_list);
ctx->pure_call_list = call;
} else {
- set_irn_link(call, ctx->const_call_list);
- ctx->const_call_list = call;
+ if (prop & mtp_property_has_loop) {
+ set_irn_link(call, ctx->nonfloat_const_call_list);
+ ctx->nonfloat_const_call_list = call;
+ } else {
+ set_irn_link(call, ctx->float_const_call_list);
+ ctx->float_const_call_list = call;
+ }
}
} else if (is_Proj(node)) {
/*
/**
* Fix the list of collected Calls.
*
- * @param irg the graph that contained calls to pure functions
- * @param call_list the list of all call sites of const functions
- * @param proj_list the list of all memory/exception Proj's of this call sites
+ * @param irg the graph that contained calls to pure functions
+ * @param ctx context
*/
-static void fix_const_call_list(ir_graph *irg, ir_node *call_list, ir_node *proj_list) {
+static void fix_const_call_lists(ir_graph *irg, env_t *ctx) {
ir_node *call, *next, *mem, *proj;
int exc_changed = 0;
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
- /* First step: fix all calls by removing it's memory input.
- It's original memory input is preserved in their link fields. */
- for (call = call_list; call; call = next) {
+ /* First step: fix all calls by removing their memory input and let
+ * them floating.
+ * The original memory input is preserved in their link fields. */
+ for (call = ctx->float_const_call_list; call != NULL; call = next) {
next = get_irn_link(call);
mem = get_Call_mem(call);
set_Call_mem(call, get_irg_no_mem(irg));
/*
- * Sorrily we cannot simply set the node to 'float'.
+ * Unfortunately we cannot simply set the node to 'float'.
* There is a reason for that:
*
* - The call might be inside a loop/if that is NOT entered
* observable states...
*/
- /* finally, this call can float
- set_irn_pinned(call, op_pin_state_floats); */
+ /* finally, this call can float */
+ set_irn_pinned(call, op_pin_state_floats);
hook_func_call(irg, call);
}
- /* Second step: fix all Proj's */
- for (proj = proj_list; proj; proj = next) {
+ /* Last step: fix all Proj's */
+ for (proj = ctx->proj_list; proj != NULL; proj = next) {
next = get_irn_link(proj);
call = get_Proj_pred(proj);
mem = get_irn_link(call);
/* beware of calls in the pure call list */
- if (! mem || get_irn_op(mem) == op_Call)
+ if (!mem || is_Call(mem))
continue;
assert(get_irn_mode(mem) == mode_M);
/* set the link to NULL for all non-const/pure calls */
set_irn_link(call, NULL);
ptr = get_Call_ptr(call);
- if (is_SymConst_addr_ent(ptr)) {
- ent = get_SymConst_entity(ptr);
+ if (is_Global(ptr)) {
+ ent = get_Global_entity(ptr);
prop = get_entity_additional_properties(ent);
if ((prop & mtp_property_nothrow) == 0)
if (mode == mtp_no_property)
return mtp_no_property;
- if (irn_visited(node))
+ if (irn_visited_else_mark(node))
return mode;
- mark_irn_visited(node);
-
switch (get_irn_opcode(node)) {
case iro_Proj:
node = get_Proj_pred(node);
case iro_Call:
/* A call is only tolerable if its either constant or pure. */
ptr = get_Call_ptr(node);
- if (get_irn_op(ptr) == op_SymConst &&
- get_SymConst_kind(ptr) == symconst_addr_ent) {
+ if (is_SymConst(ptr) && get_SymConst_kind(ptr) == symconst_addr_ent) {
ir_entity *ent = get_SymConst_entity(ptr);
ir_graph *irg = get_entity_irg(ent);
if (prop != mtp_no_property) {
/* check, if a keep-alive exists */
for (j = get_End_n_keepalives(end) - 1; j >= 0; --j) {
- ir_node *mem = get_End_keepalive(end, j);
+ ir_node *kept = get_End_keepalive(end, j);
+
+ if (is_Block(kept)) {
+ prop = mtp_no_property;
+ break;
+ }
- if (mode_M != get_irn_mode(mem))
+ if (mode_M != get_irn_mode(kept))
continue;
- prop = max_property(prop, follow_mem(mem, prop));
+ prop = max_property(prop, follow_mem(kept, prop));
if (prop == mtp_no_property)
break;
}
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
ir_graph *irg = get_irp_irg(i);
- ctx->const_call_list = NULL;
- ctx->pure_call_list = NULL;
- ctx->proj_list = NULL;
+ ctx->float_const_call_list = NULL;
+ ctx->nonfloat_const_call_list = NULL;
+ ctx->pure_call_list = NULL;
+ ctx->proj_list = NULL;
irg_walk_graph(irg, NULL, collect_const_and_pure_calls, ctx);
- if (ctx->const_call_list) {
- fix_const_call_list(irg, ctx->const_call_list, ctx->proj_list);
+ if (ctx->float_const_call_list != NULL) {
+ fix_const_call_lists(irg, ctx);
/* this graph was changed, invalidate analysis info */
set_irg_outs_inconsistent(irg);
if (is_alloc_entity != NULL && is_Call(node)) {
ir_node *ptr = get_Call_ptr(node);
- if (is_SymConst_addr_ent(ptr)) {
- ir_entity *ent = get_SymConst_entity(ptr);
+ if (is_Global(ptr)) {
+ ir_entity *ent = get_Global_entity(ptr);
return is_alloc_entity(ent);
}
}
/* ok */
break;
case iro_Store:
- if (get_Store_ptr(succ) == n)
- return 0;
+ if (get_Store_value(succ) == n)
+ return 1;
/* ok if its only the address input */
break;
case iro_Sel:
case iro_Cast:
case iro_Confirm:
if (is_stored(succ))
- return 0;
+ return 1;
break;
case iro_Call:
ptr = get_Call_ptr(succ);
- if (is_SymConst_addr_ent(ptr)) {
- ir_entity *ent = get_SymConst_entity(ptr);
+ if (is_Global(ptr)) {
+ ir_entity *ent = get_Global_entity(ptr);
int i;
/* we know the called entity */
/* n is the i'th param of the call */
if (get_method_param_access(ent, i) & ptr_access_store) {
/* n is store in ent */
- return 0;
+ return 1;
}
}
}
} else {
- return 0;
+ /* unknown call address */
+ return 1;
}
break;
default:
/* bad, potential alias */
- return 0;
+ return 1;
}
}
+ return 0;
} /* is_stored */
/**
if (! is_Return(pred))
continue;
for (j = get_Return_n_ress(pred) - 1; j >= 0; --j) {
- const ir_node *res = get_Return_res(pred, j);
+ const ir_node *irn = get_Return_res(pred, j);
- if (is_stored(res)) {
+ if (is_stored(irn)) {
/* bad, might create an alias */
res = ~mtp_property_malloc;
goto finish;
} else if (is_Call(res)) {
ir_node *ptr = get_Call_ptr(res);
- if (is_SymConst_addr_ent(ptr)) {
+ if (is_Global(ptr)) {
/* a direct call */
- ir_entity *ent = get_SymConst_entity(ptr);
+ ir_entity *ent = get_Global_entity(ptr);
ir_graph *callee = get_entity_irg(ent);
if (callee == irg) {
if (is_Call(pred)) {
ir_node *ptr = get_Call_ptr(pred);
- if (is_SymConst_addr_ent(ptr)) {
+ if (is_Global(ptr)) {
/* a direct call */
- ir_entity *ent = get_SymConst_entity(ptr);
+ ir_entity *ent = get_Global_entity(ptr);
ir_graph *callee = get_entity_irg(ent);
if (callee == irg) {
return curr_prop;
} /* check_nothrow_or_malloc */
+/**
+ * When a function was detected as "const", it might be moved out of loops.
+ * This might be dangerous if the graph might contain endless loops.
+ */
+static void check_for_possible_endless_loops(ir_graph *irg) {
+ ir_loop *root_loop;
+ assure_cf_loop(irg);
+
+ root_loop = get_irg_loop(irg);
+ if (root_loop->flags & loop_outer_loop)
+ set_irg_additional_property(irg, mtp_property_has_loop);
+}
+
/*
* optimize function calls by handling const functions
*/
if (prop & mtp_property_const) {
++num_const;
DB((dbg, LEVEL_2, "%+F has the const property\n", irg));
+ check_for_possible_endless_loops(irg);
} else if (prop & mtp_property_pure) {
++num_pure;
DB((dbg, LEVEL_2, "%+F has the pure property\n", irg));