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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_can_inline.cpp
*
* Determines if we can inline a function call using ir_function_inlining.cpp.
*
* The primary restriction is that we can't return from the function
* other than as the last instruction. We could potentially work
* around this for some constructs by flattening control flow and
* moving the return to the end, or by using breaks from a do {} while
* (0) loop surrounding the function body.
*/
#include "ir.h"
class ir_function_can_inline_visitor : public ir_hierarchical_visitor {
public:
ir_function_can_inline_visitor()
{
this->num_returns = 0;
}
virtual ir_visitor_status visit_enter(ir_return *);
int num_returns;
};
ir_visitor_status
ir_function_can_inline_visitor::visit_enter(ir_return *ir)
{
(void) ir;
this->num_returns++;
return visit_continue;
}
bool
can_inline(ir_call *call)
{
ir_function_can_inline_visitor v;
const ir_function_signature *callee = call->callee;
if (!callee->is_defined)
return false;
v.run((exec_list *) &callee->body);
/* If the function is empty (no last instruction) or does not end with a
* return statement, we need to count the implicit return.
*/
ir_instruction *last = (ir_instruction *)callee->body.get_tail();
if (last == NULL || !last->as_return())
v.num_returns++;
return v.num_returns == 1;
}
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