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/*
* Copyright © 2015 Red Hat
*
* 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.
*/
/**
* \file lower_subroutine.cpp
*
* lowers subroutines to an if ladder.
*/
#include "compiler/glsl_types.h"
#include "glsl_parser_extras.h"
#include "ir.h"
#include "ir_builder.h"
using namespace ir_builder;
namespace {
class lower_subroutine_visitor : public ir_hierarchical_visitor {
public:
lower_subroutine_visitor(struct _mesa_glsl_parse_state *state)
: state(state)
{
this->progress = false;
}
ir_visitor_status visit_leave(ir_call *);
ir_call *call_clone(ir_call *call, ir_function_signature *callee);
bool progress;
struct _mesa_glsl_parse_state *state;
};
}
bool
lower_subroutine(exec_list *instructions, struct _mesa_glsl_parse_state *state)
{
lower_subroutine_visitor v(state);
visit_list_elements(&v, instructions);
return v.progress;
}
ir_call *
lower_subroutine_visitor::call_clone(ir_call *call, ir_function_signature *callee)
{
void *mem_ctx = ralloc_parent(call);
ir_dereference_variable *new_return_ref = NULL;
if (call->return_deref != NULL)
new_return_ref = call->return_deref->clone(mem_ctx, NULL);
exec_list new_parameters;
foreach_in_list(ir_instruction, ir, &call->actual_parameters) {
new_parameters.push_tail(ir->clone(mem_ctx, NULL));
}
return new(mem_ctx) ir_call(callee, new_return_ref, &new_parameters);
}
ir_visitor_status
lower_subroutine_visitor::visit_leave(ir_call *ir)
{
if (!ir->sub_var)
return visit_continue;
void *mem_ctx = ralloc_parent(ir);
ir_if *last_branch = NULL;
for (int s = this->state->num_subroutines - 1; s >= 0; s--) {
ir_rvalue *var;
ir_function *fn = this->state->subroutines[s];
ir_constant *lc = new(mem_ctx)ir_constant(fn->subroutine_index);
bool is_compat = false;
for (int i = 0; i < fn->num_subroutine_types; i++) {
if (ir->sub_var->type->without_array() == fn->subroutine_types[i]) {
is_compat = true;
break;
}
}
if (is_compat == false)
continue;
if (ir->array_idx != NULL)
var = ir->array_idx->clone(mem_ctx, NULL);
else
var = new(mem_ctx) ir_dereference_variable(ir->sub_var);
ir_function_signature *sub_sig =
fn->exact_matching_signature(this->state,
&ir->actual_parameters);
ir_call *new_call = call_clone(ir, sub_sig);
if (!last_branch)
last_branch = if_tree(equal(subr_to_int(var), lc), new_call);
else
last_branch = if_tree(equal(subr_to_int(var), lc), new_call, last_branch);
}
if (last_branch)
ir->insert_before(last_branch);
ir->remove();
return visit_continue;
}