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/*
* Copyright © 2010 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.
*/
/**
* \file ir_function_inlining.cpp
*
* Replaces calls to functions with the body of the function.
*/
#define NULL 0
#include "ir.h"
#include "ir_visitor.h"
#include "ir_function_inlining.h"
#include "ir_expression_flattening.h"
#include "glsl_types.h"
class variable_remap : public exec_node {
public:
variable_remap(const ir_variable *old_var, ir_variable *new_var)
: old_var(old_var), new_var(new_var)
{
/* empty */
}
const ir_variable *old_var;
ir_variable *new_var;
};
class ir_function_cloning_visitor : public ir_visitor {
public:
ir_function_cloning_visitor(ir_variable *retval)
: retval(retval)
{
/* empty */
}
virtual ~ir_function_cloning_visitor()
{
/* empty */
}
void remap_variable(const ir_variable *old_var, ir_variable *new_var) {
variable_remap *remap = new variable_remap(old_var, new_var);
this->remap_list.push_tail(remap);
}
ir_variable *get_remapped_variable(ir_variable *var) {
foreach_iter(exec_list_iterator, iter, this->remap_list) {
variable_remap *remap = (variable_remap *)iter.get();
if (var == remap->old_var)
return remap->new_var;
}
/* Not a reapped variable, so a global scoped reference, for example. */
return var;
}
/* List of variable_remap for mapping from original function body variables
* to inlined function body variables.
*/
exec_list remap_list;
/* Return value for the inlined function. */
ir_variable *retval;
/**
* \name Visit methods
*
* As typical for the visitor pattern, there must be one \c visit method for
* each concrete subclass of \c ir_instruction. Virtual base classes within
* the hierarchy should not have \c visit methods.
*/
/*@{*/
virtual void visit(ir_variable *);
virtual void visit(ir_loop *);
virtual void visit(ir_loop_jump *);
virtual void visit(ir_function_signature *);
virtual void visit(ir_function *);
virtual void visit(ir_expression *);
virtual void visit(ir_swizzle *);
virtual void visit(ir_dereference *);
virtual void visit(ir_assignment *);
virtual void visit(ir_constant *);
virtual void visit(ir_call *);
virtual void visit(ir_return *);
virtual void visit(ir_if *);
/*@}*/
ir_instruction *result;
};
void
ir_function_cloning_visitor::visit(ir_variable *ir)
{
ir_variable *new_var = ir->clone();
this->result = new_var;
this->remap_variable(ir, new_var);
}
void
ir_function_cloning_visitor::visit(ir_loop *ir)
{
(void)ir;
this->result = NULL;
}
void
ir_function_cloning_visitor::visit(ir_loop_jump *ir)
{
(void) ir;
this->result = NULL;
}
void
ir_function_cloning_visitor::visit(ir_function_signature *ir)
{
(void)ir;
this->result = NULL;
}
void
ir_function_cloning_visitor::visit(ir_function *ir)
{
(void) ir;
this->result = NULL;
}
void
ir_function_cloning_visitor::visit(ir_expression *ir)
{
unsigned int operand;
ir_rvalue *op[2] = {NULL, NULL};
for (operand = 0; operand < ir->get_num_operands(); operand++) {
ir->operands[operand]->accept(this);
op[operand] = this->result->as_rvalue();
assert(op[operand]);
}
this->result = new ir_expression(ir->operation, ir->type, op[0], op[1]);
}
void
ir_function_cloning_visitor::visit(ir_swizzle *ir)
{
ir->val->accept(this);
this->result = new ir_swizzle(this->result->as_rvalue(), ir->mask);
}
void
ir_function_cloning_visitor::visit(ir_dereference *ir)
{
if (ir->mode == ir_dereference::ir_reference_variable) {
ir_variable *old_var = ir->var->as_variable();
/* If it's a deref of a real variable, then we need to remap it if
* it was local to the function.
*/
if (old_var) {
ir_variable *new_var;
new_var = this->get_remapped_variable(old_var);
this->result = new ir_dereference(new_var);
} else {
ir->var->accept(this);
this->result = new ir_dereference(this->result);
}
} else if (ir->mode == ir_dereference::ir_reference_array) {
ir_instruction *variable;
ir_rvalue *index;
ir->var->accept(this);
variable = this->result;
ir->selector.array_index->accept(this);
index = this->result->as_rvalue();
this->result = new ir_dereference(variable, index);
} else {
assert(ir->mode == ir_dereference::ir_reference_record);
/* FINISHME: inlining of structure references */
assert(0);
}
}
void
ir_function_cloning_visitor::visit(ir_assignment *ir)
{
ir_rvalue *lhs, *rhs, *condition;
ir->lhs->accept(this);
lhs = this->result->as_rvalue();
ir->rhs->accept(this);
rhs = this->result->as_rvalue();
ir->condition->accept(this);
condition = this->result->as_rvalue();
this->result = new ir_assignment(lhs, rhs, condition);
}
void
ir_function_cloning_visitor::visit(ir_constant *ir)
{
this->result = ir->clone();
}
void
ir_function_cloning_visitor::visit(ir_call *ir)
{
exec_list parameters;
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *param = (ir_rvalue *)iter.get();
param->accept(this);
parameters.push_tail(this->result);
}
this->result = new ir_call(ir->get_callee(), ¶meters);
}
void
ir_function_cloning_visitor::visit(ir_return *ir)
{
ir_rvalue *rval;
assert(this->retval);
rval = ir->get_value();
rval->accept(this);
rval = this->result->as_rvalue();
assert(rval);
result = new ir_assignment(new ir_dereference(this->retval),
ir->get_value(), NULL);
}
void
ir_function_cloning_visitor::visit(ir_if *ir)
{
(void) ir;
result = NULL;
}
bool
can_inline(ir_call *call)
{
bool found_return = false;
/* FINISHME: Right now we only allow a single statement that is a return.
*/
foreach_iter(exec_list_iterator, iter, call->get_callee()->body) {
ir_instruction *ir = (ir_instruction *)iter.get();
if (ir->get_next()->get_next() != NULL)
return false;
if (!ir->as_return())
return false;
found_return = true;
}
return found_return;
}
bool
automatic_inlining_predicate(ir_instruction *ir)
{
ir_call *call = ir->as_call();
if (call && can_inline(call))
return true;
return false;
}
bool
do_function_inlining(exec_list *instructions)
{
bool progress = false;
do_expression_flattening(instructions, automatic_inlining_predicate);
foreach_iter(exec_list_iterator, iter, *instructions) {
ir_instruction *ir = (ir_instruction *)iter.get();
ir_assignment *assign = ir->as_assignment();
ir_call *call;
if (assign) {
call = assign->rhs->as_call();
if (!call || !can_inline(call))
continue;
/* generates the parameter setup, function body, and returns the return
* value of the function
*/
ir_rvalue *rhs = call->generate_inline(ir);
assert(rhs);
assign->rhs = rhs;
progress = true;
} else if ((call = ir->as_call()) && can_inline(call)) {
(void)call->generate_inline(ir);
ir->remove();
progress = true;
} else {
ir_function_inlining_visitor v;
ir->accept(&v);
}
}
return progress;
}
ir_rvalue *
ir_call::generate_inline(ir_instruction *next_ir)
{
ir_variable **parameters;
int num_parameters;
int i;
ir_variable *retval = NULL;
num_parameters = 0;
foreach_iter(exec_list_iterator, iter_sig, this->callee->parameters)
num_parameters++;
parameters = new ir_variable *[num_parameters];
/* Generate storage for the return value. */
if (this->callee->return_type) {
retval = new ir_variable(this->callee->return_type, "__retval");
next_ir->insert_before(retval);
}
ir_function_cloning_visitor v = ir_function_cloning_visitor(retval);
/* Generate the declarations for the parameters to our inlined code,
* and set up the mapping of real function body variables to ours.
*/
i = 0;
exec_list_iterator sig_param_iter = this->callee->parameters.iterator();
exec_list_iterator param_iter = this->actual_parameters.iterator();
for (i = 0; i < num_parameters; i++) {
const ir_variable *const sig_param = (ir_variable *) sig_param_iter.get();
ir_rvalue *param = (ir_rvalue *) param_iter.get();
/* Generate a new variable for the parameter. */
parameters[i] = sig_param->clone();
next_ir->insert_before(parameters[i]);
v.remap_variable(sig_param, parameters[i]);
/* Move the actual param into our param variable if it's an 'in' type. */
if (parameters[i]->mode == ir_var_in ||
parameters[i]->mode == ir_var_inout) {
ir_assignment *assign;
assign = new ir_assignment(new ir_dereference(parameters[i]),
param, NULL);
next_ir->insert_before(assign);
}
sig_param_iter.next();
param_iter.next();
}
/* Generate the inlined body of the function. */
foreach_iter(exec_list_iterator, iter, callee->body) {
ir_instruction *ir = (ir_instruction *)iter.get();
ir->accept(&v);
assert(v.result);
next_ir->insert_before(v.result);
}
/* Generate the declarations for the parameters to our inlined code,
* and set up the mapping of real function body variables to ours.
*/
i = 0;
param_iter = this->actual_parameters.iterator();
for (i = 0; i < num_parameters; i++) {
ir_instruction *const param = (ir_instruction *) param_iter.get();
/* Move the actual param into our param variable if it's an 'in' type. */
if (parameters[i]->mode == ir_var_out ||
parameters[i]->mode == ir_var_inout) {
ir_assignment *assign;
assign = new ir_assignment(param->as_rvalue(),
new ir_dereference(parameters[i]),
NULL);
next_ir->insert_before(assign);
}
param_iter.next();
}
delete(parameters);
if (retval)
return new ir_dereference(retval);
else
return NULL;
}
void
ir_function_inlining_visitor::visit(ir_variable *ir)
{
(void) ir;
}
void
ir_function_inlining_visitor::visit(ir_loop *ir)
{
do_function_inlining(&ir->body_instructions);
}
void
ir_function_inlining_visitor::visit(ir_loop_jump *ir)
{
(void) ir;
}
void
ir_function_inlining_visitor::visit(ir_function_signature *ir)
{
do_function_inlining(&ir->body);
}
void
ir_function_inlining_visitor::visit(ir_function *ir)
{
foreach_iter(exec_list_iterator, iter, *ir) {
ir_function_signature *const sig = (ir_function_signature *) iter.get();
sig->accept(this);
}
}
void
ir_function_inlining_visitor::visit(ir_expression *ir)
{
unsigned int operand;
for (operand = 0; operand < ir->get_num_operands(); operand++) {
ir->operands[operand]->accept(this);
}
}
void
ir_function_inlining_visitor::visit(ir_swizzle *ir)
{
ir->val->accept(this);
}
void
ir_function_inlining_visitor::visit(ir_dereference *ir)
{
if (ir->mode == ir_dereference::ir_reference_array) {
ir->selector.array_index->accept(this);
}
ir->var->accept(this);
}
void
ir_function_inlining_visitor::visit(ir_assignment *ir)
{
ir->rhs->accept(this);
}
void
ir_function_inlining_visitor::visit(ir_constant *ir)
{
(void) ir;
}
void
ir_function_inlining_visitor::visit(ir_call *ir)
{
(void) ir;
}
void
ir_function_inlining_visitor::visit(ir_return *ir)
{
(void) ir;
}
void
ir_function_inlining_visitor::visit(ir_if *ir)
{
ir->condition->accept(this);
do_function_inlining(&ir->then_instructions);
do_function_inlining(&ir->else_instructions);
}
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