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/*
* Copyright © 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir.h"
#include "nir_deref.h"
struct split_struct_state {
void *dead_ctx;
struct hash_table *var_to_member_map;
};
static nir_variable *
find_var_member(struct nir_variable *var, unsigned member,
struct hash_table *var_to_member_map)
{
struct hash_entry *map_entry =
_mesa_hash_table_search(var_to_member_map, var);
if (map_entry == NULL)
return NULL;
nir_variable **members = map_entry->data;
assert(member < var->num_members);
return members[member];
}
static const struct glsl_type *
member_type(const struct glsl_type *type, unsigned index)
{
if (glsl_type_is_array(type)) {
const struct glsl_type *elem =
member_type(glsl_get_array_element(type), index);
return glsl_get_array_instance(elem, glsl_get_length(type));
} else {
assert(glsl_type_is_struct(type));
assert(index < glsl_get_length(type));
return glsl_get_struct_field(type, index);
}
}
static void
split_variable(struct nir_variable *var, nir_shader *shader,
struct hash_table *var_to_member_map, void *dead_ctx)
{
assert(var->state_slots == NULL);
/* Constant initializers are currently not handled */
assert(var->constant_initializer == NULL);
nir_variable **members =
ralloc_array(dead_ctx, nir_variable *, var->num_members);
for (unsigned i = 0; i < var->num_members; i++) {
char *member_name = NULL;
if (var->name) {
/* Calculate a reasonable variable name */
member_name = ralloc_strdup(dead_ctx, var->name);
const struct glsl_type *t = var->type;
while (glsl_type_is_array(t)) {
ralloc_strcat(&member_name, "[*]");
t = glsl_get_array_element(t);
}
const char *field_name = glsl_get_struct_elem_name(t, i);
if (field_name) {
member_name = ralloc_asprintf(dead_ctx, "%s.%s",
member_name, field_name);
} else {
member_name = ralloc_asprintf(dead_ctx, "%s.@%d", member_name, i);
}
}
members[i] =
nir_variable_create(shader, var->members[i].mode,
member_type(var->type, i), member_name);
if (var->interface_type) {
members[i]->interface_type =
glsl_get_struct_field(var->interface_type, i);
}
members[i]->data = var->members[i];
}
_mesa_hash_table_insert(var_to_member_map, var, members);
}
static bool
split_variables_in_list(struct exec_list *var_list, nir_shader *shader,
struct hash_table *var_to_member_map, void *dead_ctx)
{
bool progress = false;
nir_foreach_variable_safe(var, var_list) {
if (var->num_members == 0)
continue;
split_variable(var, shader, var_to_member_map, dead_ctx);
exec_node_remove(&var->node);
progress = true;
}
return progress;
}
static nir_deref_instr *
build_member_deref(nir_builder *b, nir_deref_instr *deref, nir_variable *member)
{
if (deref->deref_type == nir_deref_type_var) {
return nir_build_deref_var(b, member);
} else {
nir_deref_instr *parent =
build_member_deref(b, nir_deref_instr_parent(deref), member);
return nir_build_deref_follower(b, parent, deref);
}
}
static void
rewrite_deref_instr(nir_builder *b, nir_deref_instr *deref,
struct hash_table *var_to_member_map)
{
/* We must be a struct deref */
if (deref->deref_type != nir_deref_type_struct)
return;
nir_deref_instr *base;
for (base = nir_deref_instr_parent(deref);
base && base->deref_type != nir_deref_type_var;
base = nir_deref_instr_parent(base)) {
/* If this struct is nested inside another, bail */
if (base->deref_type == nir_deref_type_struct)
return;
}
/* We must be on a variable with members */
if (!base || base->var->num_members == 0)
return;
nir_variable *member = find_var_member(base->var, deref->strct.index,
var_to_member_map);
assert(member);
b->cursor = nir_before_instr(&deref->instr);
nir_deref_instr *member_deref =
build_member_deref(b, nir_deref_instr_parent(deref), member);
nir_ssa_def_rewrite_uses(&deref->dest.ssa,
nir_src_for_ssa(&member_deref->dest.ssa));
/* The referenced variable is no longer valid, clean up the deref */
nir_deref_instr_remove_if_unused(deref);
}
bool
nir_split_per_member_structs(nir_shader *shader)
{
bool progress = false;
void *dead_ctx = ralloc_context(NULL);
struct hash_table *var_to_member_map =
_mesa_hash_table_create(dead_ctx, _mesa_hash_pointer,
_mesa_key_pointer_equal);
progress |= split_variables_in_list(&shader->inputs, shader,
var_to_member_map, dead_ctx);
progress |= split_variables_in_list(&shader->outputs, shader,
var_to_member_map, dead_ctx);
progress |= split_variables_in_list(&shader->system_values, shader,
var_to_member_map, dead_ctx);
if (!progress)
return false;
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
nir_builder b;
nir_builder_init(&b, function->impl);
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type == nir_instr_type_deref) {
rewrite_deref_instr(&b, nir_instr_as_deref(instr),
var_to_member_map);
}
}
}
}
ralloc_free(dead_ctx);
return progress;
}
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