* @author Michael Beck
* @version $Id$
*/
-
#include "config.h"
+#include <stdbool.h>
+
+#include "lower_calls.h"
#include "lowering.h"
#include "irprog_t.h"
#include "irnode_t.h"
#include "pmap.h"
#include "error.h"
-/** A type map for def_find_pointer_type. */
-static pmap *type_map;
+static pmap *pointer_types;
+static pmap *lowered_mtps;
/**
* Default implementation for finding a pointer type for a given element type.
* Simple create a new one.
*/
-static ir_type *def_find_pointer_type(ir_type *e_type, ir_mode *mode,
- int alignment)
+static ir_type *get_pointer_type(ir_type *dest_type)
{
- /* Mode and alignment are always identical in all calls to def_find_pointer_type(), so
- we simply can use a map from the element type to the pointer type. */
- ir_type *res = (ir_type*)pmap_get(type_map, e_type);
- if (res == NULL || get_type_mode(res) != mode) {
- res = new_type_pointer(e_type);
- set_type_mode(res, mode);
- set_type_alignment_bytes(res, alignment);
- pmap_insert(type_map, e_type, res);
+ ir_type *res = (ir_type*)pmap_get(pointer_types, dest_type);
+ if (res == NULL) {
+ res = new_type_pointer(dest_type);
+ pmap_insert(pointer_types, dest_type, res);
}
return res;
}
/**
* Creates a new lowered type for a method type with compound
* arguments. The new type is associated to the old one and returned.
- *
- * @param lp parameter struct
- * @param mtp the method type to lower
- *
- * The current implementation expects that a lowered type already
- * includes the necessary changes ...
*/
-static ir_type *create_modified_mtd_type(const lower_params_t *lp, ir_type *mtp)
+static ir_type *lower_mtp(compound_call_lowering_flags flags, ir_type *mtp)
{
- ir_type *lowered, *ptr_tp;
- ir_type **params, **results, *res_tp;
- size_t *param_map;
- ir_mode *modes[MAX_REGISTER_RET_VAL];
- size_t n_ress, n_params, nn_ress, nn_params, i;
- add_hidden hidden_params;
- int changed = 0;
- ir_variadicity var;
-
- lowered = get_associated_type(mtp);
+ bool must_be_lowered = false;
+ ir_type *lowered;
+ ir_type **params;
+ ir_type **results;
+ size_t n_ress;
+ size_t n_params;
+ size_t nn_ress;
+ size_t nn_params;
+ size_t i;
+
+ if (!is_Method_type(mtp))
+ return mtp;
+
+ lowered = (ir_type*)pmap_get(lowered_mtps, mtp);
if (lowered != NULL)
return lowered;
- n_ress = get_method_n_ress(mtp);
- NEW_ARR_A(ir_type *, results, n_ress);
-
- n_params = get_method_n_params(mtp);
- NEW_ARR_A(ir_type *, params, n_params + n_ress);
-
- NEW_ARR_A(size_t, param_map, n_params + n_ress);
-
- hidden_params = lp->hidden_params;
- if (hidden_params == ADD_HIDDEN_SMART &&
- get_method_variadicity(mtp) == variadicity_variadic)
- hidden_params = ADD_HIDDEN_ALWAYS_IN_FRONT;
-
- if (hidden_params == ADD_HIDDEN_ALWAYS_IN_FRONT) {
- /* add hidden in front */
- for (nn_ress = nn_params = i = 0; i < n_ress; ++i) {
- res_tp = get_method_res_type(mtp, i);
-
- if (is_compound_type(res_tp)) {
- int n_regs = 0;
-
- if (lp->flags & LF_SMALL_CMP_IN_REGS)
- n_regs = lp->ret_compound_in_regs(res_tp, modes);
-
- if (n_regs > 0) {
- /* this compound will be returned solely in registers */
- panic("Returning compounds in registers not yet implemented");
- }
- else {
- /* this compound will be allocated on callers stack and its
- address will be transmitted as a hidden parameter. */
- ptr_tp = lp->find_pointer_type(res_tp, get_modeP_data(), lp->def_ptr_alignment);
- params[nn_params] = ptr_tp;
- param_map[nn_params] = n_params + i;
- ++nn_params;
- changed++;
- if (lp->flags & LF_RETURN_HIDDEN)
- results[nn_ress++] = ptr_tp;
- }
- } else {
- /* scalar result */
- results[nn_ress++] = res_tp;
- }
- }
-
- for (i = 0; i < n_params; ++i, ++nn_params) {
- params[nn_params] = get_method_param_type(mtp, i);
- param_map[nn_params] = i;
- }
- } else {
- /* add hidden parameters last */
- assert(get_method_variadicity(mtp) == variadicity_non_variadic &&
- "Cannot add hidden parameters at end of variadic function");
-
- for (nn_params = 0; nn_params < n_params; ++nn_params) {
- params[nn_params] = get_method_param_type(mtp, nn_params);
- param_map[nn_params] = nn_params;
+ /* check if the type has to be lowered at all */
+ n_ress = get_method_n_ress(mtp);
+ for (i = 0; i < n_ress; ++i) {
+ ir_type *res_tp = get_method_res_type(mtp, i);
+ if (is_compound_type(res_tp)) {
+ must_be_lowered = true;
+ break;
}
-
- for (nn_ress = i = 0; i < n_ress; ++i) {
- res_tp = get_method_res_type(mtp, i);
-
- if (is_compound_type(res_tp)) {
- params[nn_params] = lp->find_pointer_type(res_tp, get_modeP_data(), lp->def_ptr_alignment);
- param_map[nn_params] = n_params + i;
- ++nn_params;
- } else {
- results[nn_ress++] = res_tp;
- }
+ }
+ if (!must_be_lowered)
+ return mtp;
+
+ n_params = get_method_n_params(mtp);
+ results = ALLOCANZ(ir_type*, n_ress);
+ params = ALLOCANZ(ir_type*, n_params + n_ress);
+ nn_ress = 0;
+ nn_params = 0;
+
+ /* add a hidden parameter in front for every compound result */
+ for (i = 0; i < n_ress; ++i) {
+ ir_type *res_tp = get_method_res_type(mtp, i);
+
+ if (is_compound_type(res_tp)) {
+ /* this compound will be allocated on callers stack and its
+ address will be transmitted as a hidden parameter. */
+ ir_type *ptr_tp = get_pointer_type(res_tp);
+ params[nn_params++] = ptr_tp;
+ if (flags & LF_RETURN_HIDDEN)
+ results[nn_ress++] = ptr_tp;
+ } else {
+ /* scalar result */
+ results[nn_ress++] = res_tp;
}
}
+ /* copy over parameter types */
+ for (i = 0; i < n_params; ++i) {
+ params[nn_params++] = get_method_param_type(mtp, i);
+ }
+ assert(nn_ress <= n_ress);
+ assert(nn_params <= n_params + n_ress);
/* create the new type */
lowered = new_d_type_method(nn_params, nn_ress, get_type_dbg_info(mtp));
for (i = 0; i < nn_ress; ++i)
set_method_res_type(lowered, i, results[i]);
- var = get_method_variadicity(mtp);
- set_method_variadicity(lowered, var);
+ set_method_variadicity(lowered, get_method_variadicity(mtp));
/* associate the lowered type with the original one for easier access */
- if (changed) {
- set_method_calling_convention(lowered, get_method_calling_convention(mtp) | cc_compound_ret);
- }
+ set_method_calling_convention(lowered, get_method_calling_convention(mtp) | cc_compound_ret);
set_lowered_type(mtp, lowered);
+ pmap_insert(lowered_mtps, mtp, lowered);
return lowered;
}
*/
typedef struct wlk_env_t {
size_t arg_shift; /**< The Argument index shift for parameters. */
- size_t first_hidden; /**< The index of the first hidden argument. */
struct obstack obst; /**< An obstack to allocate the data on. */
cl_entry *cl_list; /**< The call list. */
pmap *dummy_map; /**< A map for finding the dummy arguments. */
- unsigned dnr; /**< The dummy index number. */
- const lower_params_t *params; /**< Lowering parameters. */
+ compound_call_lowering_flags flags;
ir_type *lowered_mtp; /**< The lowered method type of the current irg if any. */
ir_type *value_params; /**< The value params type if any. */
unsigned only_local_mem:1; /**< Set if only local memory access was found. */
}
}
+/*
+ * Returns non-zero if a Call is surely a self-recursive Call.
+ * Beware: if this functions returns 0, the call might be self-recursive!
+ */
+static bool is_self_recursive_Call(const ir_node *call)
+{
+ const ir_node *callee = get_Call_ptr(call);
+
+ if (is_SymConst_addr_ent(callee)) {
+ const ir_entity *ent = get_SymConst_entity(callee);
+ const ir_graph *irg = get_entity_irg(ent);
+ if (irg == get_irn_irg(call))
+ return 1;
+ }
+ return 0;
+}
+
/**
* Post walker: shift all parameter indexes
* and collect Calls with compound returns in the call list.
case iro_Proj:
if (env->arg_shift > 0) {
ir_node *pred = get_Proj_pred(n);
+ ir_graph *irg = get_irn_irg(n);
/* Fix the argument numbers */
- if (pred == get_irg_args(current_ir_graph)) {
+ if (pred == get_irg_args(irg)) {
long pnr = get_Proj_proj(n);
set_Proj_proj(n, pnr + env->arg_shift);
env->changed = 1;
}
}
break;
- case iro_Call:
+ case iro_Call: {
+ size_t i;
+ size_t n_res;
if (! is_self_recursive_Call(n)) {
/* any non self recursive call might access global memory */
env->only_local_mem = 0;
}
ctp = get_Call_type(n);
- if (env->params->flags & LF_COMPOUND_RETURN) {
- /* check for compound returns */
- size_t i, n_res;
- for (i = 0, n_res = get_method_n_ress(ctp); i < n_res; ++i) {
- if (is_compound_type(get_method_res_type(ctp, i))) {
- /*
- * This is a call with a compound return. As the result
- * might be ignored, we must put it in the list.
- */
- (void)get_Call_entry(n, env);
- break;
- }
+ /* check for compound returns */
+ for (i = 0, n_res = get_method_n_ress(ctp); i < n_res; ++i) {
+ if (is_compound_type(get_method_res_type(ctp, i))) {
+ /*
+ * This is a call with a compound return. As the result
+ * might be ignored, we must put it in the list.
+ */
+ (void)get_Call_entry(n, env);
+ break;
}
}
break;
- case iro_CopyB:
+ }
+ case iro_CopyB: {
+ ir_node *src = get_CopyB_src(n);
if (env->only_local_mem) {
check_ptr(get_CopyB_src(n), env);
if (env->only_local_mem)
check_ptr(get_CopyB_dst(n), env);
}
- if (env->params->flags & LF_COMPOUND_RETURN) {
- /* check for compound returns */
- ir_node *src = get_CopyB_src(n);
- if (is_Proj(src)) {
- ir_node *proj = get_Proj_pred(src);
- if (is_Proj(proj) && get_Proj_proj(proj) == pn_Call_T_result) {
- ir_node *call = get_Proj_pred(proj);
- if (is_Call(call)) {
- ctp = get_Call_type(call);
- if (is_compound_type(get_method_res_type(ctp, get_Proj_proj(src)))) {
- /* found a CopyB from compound Call result */
- cl_entry *e = get_Call_entry(call, env);
- set_irn_link(n, e->copyb);
- e->copyb = n;
- }
+ /* check for compound returns */
+ if (is_Proj(src)) {
+ ir_node *proj = get_Proj_pred(src);
+ if (is_Proj(proj) && get_Proj_proj(proj) == pn_Call_T_result) {
+ ir_node *call = get_Proj_pred(proj);
+ if (is_Call(call)) {
+ ctp = get_Call_type(call);
+ if (is_compound_type(get_method_res_type(ctp, get_Proj_proj(src)))) {
+ /* found a CopyB from compound Call result */
+ cl_entry *e = get_Call_entry(call, env);
+ set_irn_link(n, e->copyb);
+ e->copyb = n;
}
}
}
}
break;
+ }
default:
/* do nothing */
break;
* @param ft the frame type
* @param adr the node
*/
-static int is_compound_address(ir_type *ft, ir_node *adr)
+static bool is_compound_address(ir_type *ft, ir_node *adr)
{
ir_entity *ent;
if (! is_Sel(adr))
- return 0;
+ return false;
if (get_Sel_n_indexs(adr) != 0)
- return 0;
+ return false;
ent = get_Sel_entity(adr);
return get_entity_owner(ent) == ft;
}
* @param tp the type of the dummy entity that should be create
* @param env the environment
*/
-static ir_node *get_dummy_sel(ir_graph *irg, ir_node *block, ir_type *tp, wlk_env *env)
+static ir_node *get_dummy_sel(ir_graph *irg, ir_node *block, ir_type *tp,
+ wlk_env *env)
{
ir_entity *ent;
pmap_entry *e;
/* use a map the check if we already create such an entity */
e = pmap_find(env->dummy_map, tp);
- if (e)
+ if (e) {
ent = (ir_entity*)e->value;
- else {
+ } else {
ir_type *ft = get_irg_frame_type(irg);
- char buf[16];
-
- snprintf(buf, sizeof(buf), "dummy.%u", env->dnr++);
- ent = new_entity(ft, new_id_from_str(buf), tp);
+ ident *dummy_id = id_unique("dummy.%u");
+ ent = new_entity(ft, dummy_id, tp);
pmap_insert(env->dummy_map, tp, ent);
if (get_type_state(ft) == layout_fixed) {
/* Fix the layout again */
- assert(0 && "Fixed layout not implemented");
+ panic("Fixed layout not implemented");
}
}
- return new_r_simpleSel(
- block,
- get_irg_no_mem(irg),
- get_irg_frame(irg),
- ent);
+ return new_r_simpleSel(block, get_irg_no_mem(irg), get_irg_frame(irg), ent);
}
/**
* @param entry the call list
* @param env the environment
*/
-static void add_hidden_param(ir_graph *irg, size_t n_com, ir_node **ins, cl_entry *entry, wlk_env *env)
+static void add_hidden_param(ir_graph *irg, size_t n_com, ir_node **ins,
+ cl_entry *entry, wlk_env *env)
{
ir_node *p, *n, *mem, *blk;
size_t n_args;
*/
static void fix_call_list(ir_graph *irg, wlk_env *env)
{
- const lower_params_t *lp = env->params;
cl_entry *p;
ir_node *call, **new_in;
ir_type *ctp, *lowered_mtp;
- add_hidden hidden_params;
size_t i, n_res, n_params, n_com, pos;
new_in = NEW_ARR_F(ir_node *, 0);
for (p = env->cl_list; p; p = p->next) {
call = p->call;
ctp = get_Call_type(call);
- lowered_mtp = create_modified_mtd_type(lp, ctp);
+ lowered_mtp = lower_mtp(env->flags, ctp);
set_Call_type(call, lowered_mtp);
- hidden_params = lp->hidden_params;
- if (hidden_params == ADD_HIDDEN_SMART &&
- get_method_variadicity(ctp) == variadicity_variadic)
- hidden_params = ADD_HIDDEN_ALWAYS_IN_FRONT;
-
n_params = get_Call_n_params(call);
n_com = 0;
pos = 2;
ARR_RESIZE(ir_node *, new_in, n_params + n_com + pos);
memset(new_in, 0, sizeof(*new_in) * (n_params + n_com + pos));
- if (hidden_params == ADD_HIDDEN_ALWAYS_IN_FRONT) {
- add_hidden_param(irg, n_com, &new_in[pos], p, env);
- pos += n_com;
- }
+ add_hidden_param(irg, n_com, &new_in[pos], p, env);
+ pos += n_com;
/* copy all other parameters */
for (i = 0; i < n_params; ++i)
new_in[pos++] = get_Call_param(call, i);
- if (hidden_params == ADD_HIDDEN_ALWAYS_LAST) {
- add_hidden_param(irg, n_com, &new_in[pos], p, env);
- pos += n_com;
- }
new_in[0] = get_Call_mem(call);
new_in[1] = get_Call_ptr(call);
* If it calls methods with compound parameter returns, add hidden
* parameters.
*
- * @param lp parameter struct
* @param irg the graph to transform
*/
-static void transform_irg(const lower_params_t *lp, ir_graph *irg)
+static void transform_irg(compound_call_lowering_flags flags, ir_graph *irg)
{
- ir_graph *rem = current_ir_graph;
ir_entity *ent = get_irg_entity(irg);
ir_type *mtp, *lowered_mtp, *tp, *ft;
size_t i, j, k, n_ress = 0, n_ret_com = 0;
ir_node **new_in, *ret, *endbl, *bl, *mem, *copy;
cr_pair *cr_opt;
wlk_env env;
- add_hidden hidden_params;
-
- current_ir_graph = irg;
-
- assert(ent && "Cannot transform graph without an entity");
- assert(get_irg_phase_state(irg) == phase_high && "call lowering must be done in phase high");
mtp = get_entity_type(ent);
- if (lp->flags & LF_COMPOUND_RETURN) {
- /* calculate the number of compound returns */
- n_ress = get_method_n_ress(mtp);
- for (n_ret_com = i = 0; i < n_ress; ++i) {
- tp = get_method_res_type(mtp, i);
+ /* calculate the number of compound returns */
+ n_ress = get_method_n_ress(mtp);
+ for (n_ret_com = i = 0; i < n_ress; ++i) {
+ tp = get_method_res_type(mtp, i);
- if (is_compound_type(tp))
- ++n_ret_com;
- }
+ if (is_compound_type(tp))
+ ++n_ret_com;
}
if (n_ret_com) {
normalize_one_return(irg);
/* This graph has a compound argument. Create a new type */
- lowered_mtp = create_modified_mtd_type(lp, mtp);
+ lowered_mtp = lower_mtp(flags, mtp);
set_entity_type(ent, lowered_mtp);
- hidden_params = lp->hidden_params;
- if (hidden_params == ADD_HIDDEN_SMART &&
- get_method_variadicity(mtp) == variadicity_variadic)
- hidden_params = ADD_HIDDEN_ALWAYS_IN_FRONT;
-
- if (hidden_params == ADD_HIDDEN_ALWAYS_IN_FRONT) {
- /* hidden arguments are added first */
- env.arg_shift = n_ret_com;
- env.first_hidden = 0;
- } else {
- /* hidden arguments are added last */
- env.arg_shift = 0;
- env.first_hidden = get_method_n_params(mtp);
- }
+ /* hidden arguments are added first */
+ env.arg_shift = n_ret_com;
} else {
/* we must only search for calls */
env.arg_shift = 0;
obstack_init(&env.obst);
env.cl_list = NULL;
env.dummy_map = pmap_create_ex(8);
- env.dnr = 0;
- env.params = lp;
+ env.flags = flags;
env.lowered_mtp = lowered_mtp;
env.value_params = get_method_value_param_type(mtp);
env.only_local_mem = 1;
if (is_compound_type(tp)) {
ir_node *arg = get_irg_args(irg);
- arg = new_r_Proj(arg, mode_P_data, env.first_hidden + k);
+ arg = new_r_Proj(arg, mode_P_data, k);
++k;
if (is_Unknown(pred)) {
- /* The Return(Unknown) is the Firm construct for a missing return.
- Do nothing. */
+ /* The Return(Unknown) is the Firm construct for a
+ * missing return. Do nothing. */
} else {
/**
- * Sorrily detecting that copy-return is possible isn't that simple.
- * We must check, that the hidden address is alias free during the whole
- * function.
+ * Sorrily detecting that copy-return is possible isn't
+ * that simple. We must check, that the hidden address
+ * is alias free during the whole function.
* A simple heuristic: all Loads/Stores inside
* the function access only local frame.
*/
mem = new_r_Proj(copy, mode_M, pn_CopyB_M);
}
}
- if (lp->flags & LF_RETURN_HIDDEN) {
+ if (flags & LF_RETURN_HIDDEN) {
new_in[j] = arg;
++j;
}
}
}
}
- } /* if (n_ret_com) */
+ }
pmap_destroy(env.dummy_map);
obstack_free(&env.obst, NULL);
-
- current_ir_graph = rem;
-}
-
-/**
- * Returns non-zero if the given type is a method
- * type that must be lowered.
- *
- * @param lp lowering parameters
- * @param tp The type.
- */
-static int must_be_lowered(const lower_params_t *lp, ir_type *tp)
-{
- size_t i, n_ress;
- ir_type *res_tp;
-
- if (is_Method_type(tp)) {
- if (lp->flags & LF_COMPOUND_RETURN) {
- /* check for compound returns */
- n_ress = get_method_n_ress(tp);
- for (i = 0; i < n_ress; ++i) {
- res_tp = get_method_res_type(tp, i);
-
- if (is_compound_type(res_tp))
- return 1;
- }
- }
- }
- return 0;
}
-/**
- * type-walker: lower all method types of entities
- * and points-to types.
- */
static void lower_method_types(type_or_ent tore, void *env)
{
- const lower_params_t *lp = (const lower_params_t*)env;
- ir_type *tp;
+ const compound_call_lowering_flags *flags
+ = (const compound_call_lowering_flags*)env;
/* fix method entities */
if (is_entity(tore.ent)) {
- ir_entity *ent = tore.ent;
- tp = get_entity_type(ent);
-
- if (must_be_lowered(lp, tp)) {
- tp = create_modified_mtd_type(lp, tp);
- set_entity_type(ent, tp);
- }
+ ir_entity *ent = tore.ent;
+ ir_type *tp = get_entity_type(ent);
+ ir_type *lowered = lower_mtp(*flags, tp);
+ set_entity_type(ent, lowered);
} else {
- tp = tore.typ;
+ ir_type *tp = tore.typ;
/* fix pointer to methods */
if (is_Pointer_type(tp)) {
- ir_type *etp = get_pointer_points_to_type(tp);
- if (must_be_lowered(lp, etp)) {
- etp = create_modified_mtd_type(lp, etp);
- set_pointer_points_to_type(tp, etp);
- }
+ ir_type *points_to = get_pointer_points_to_type(tp);
+ ir_type *lowered_points_to = lower_mtp(*flags, points_to);
+ set_pointer_points_to_type(tp, lowered_points_to);
}
}
}
-/*
- * Lower calls with compound parameters and return types.
- * This function does the following transformations:
- *
- * - Adds a new (hidden) pointer parameter for
- * any return compound type.
- *
- * - Use of the hidden parameters in the function code.
- *
- * - Change all calls to functions with compound return
- * by providing space for the hidden parameter on the callers
- * stack.
- *
- * - Replace a possible block copy after the function call.
- */
-void lower_calls_with_compounds(const lower_params_t *params)
+void lower_calls_with_compounds(compound_call_lowering_flags flags)
{
size_t i, n;
- ir_graph *irg;
- lower_params_t param = *params;
- if (param.find_pointer_type == NULL) {
- param.find_pointer_type = def_find_pointer_type;
- type_map = pmap_create_ex(8);
- } else
- type_map = NULL;
+ pointer_types = pmap_create();
+ lowered_mtps = pmap_create();
/* first step: Transform all graphs */
for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
- irg = get_irp_irg(i);
-
- transform_irg(¶m, irg);
+ ir_graph *irg = get_irp_irg(i);
+ transform_irg(flags, irg);
}
/* second step: Lower all method types of visible entities */
- type_walk(NULL, lower_method_types, ¶m);
+ type_walk(NULL, lower_method_types, &flags);
- if (type_map)
- pmap_destroy(type_map);
+ pmap_destroy(lowered_mtps);
+ pmap_destroy(pointer_types);
}
-
projects / libfirm / commitdiff