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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_validate.cpp
*
* Attempts to verify that various invariants of the IR tree are true.
*
* In particular, at the moment it makes sure that no single
* ir_instruction node except for ir_variable appears multiple times
* in the ir tree. ir_variable does appear multiple times: Once as a
* declaration in an exec_list, and multiple times as the endpoint of
* a dereference chain.
*/
#include <inttypes.h>
#include "ir.h"
#include "ir_hierarchical_visitor.h"
#include "hash_table.h"
class ir_validate : public ir_hierarchical_visitor {
public:
ir_validate()
{
this->ht = hash_table_ctor(0, hash_table_pointer_hash,
hash_table_pointer_compare);
this->current_function = NULL;
this->callback = ir_validate::validate_ir;
this->data = ht;
}
~ir_validate()
{
hash_table_dtor(this->ht);
}
virtual ir_visitor_status visit(ir_variable *v);
virtual ir_visitor_status visit(ir_dereference_variable *ir);
virtual ir_visitor_status visit_enter(ir_function *ir);
virtual ir_visitor_status visit_leave(ir_function *ir);
virtual ir_visitor_status visit_enter(ir_function_signature *ir);
static void validate_ir(ir_instruction *ir, void *data);
ir_function *current_function;
struct hash_table *ht;
};
ir_visitor_status
ir_validate::visit(ir_dereference_variable *ir)
{
if ((ir->var == NULL) || (ir->var->as_variable() == NULL)) {
printf("ir_dereference_variable @ %p does not specify a variable %p\n",
ir, ir->var);
abort();
}
if (hash_table_find(ht, ir->var) == NULL) {
printf("ir_dereference_variable @ %p specifies undeclared variable "
"`%s' @ %p\n",
ir, ir->var->name, ir->var);
abort();
}
this->validate_ir(ir, this->data);
return visit_continue;
}
ir_visitor_status
ir_validate::visit_enter(ir_function *ir)
{
/* Function definitions cannot be nested.
*/
if (this->current_function != NULL) {
printf("Function definition nested inside another function "
"definition:\n");
printf("%s %p inside %s %p\n",
ir->name, ir,
this->current_function->name, this->current_function);
abort();
}
/* Store the current function hierarchy being traversed. This is used
* by the function signature visitor to ensure that the signatures are
* linked with the correct functions.
*/
this->current_function = ir;
this->validate_ir(ir, this->data);
return visit_continue;
}
ir_visitor_status
ir_validate::visit_leave(ir_function *ir)
{
(void) ir;
this->current_function = NULL;
return visit_continue;
}
ir_visitor_status
ir_validate::visit_enter(ir_function_signature *ir)
{
if (this->current_function != ir->function()) {
printf("Function signature nested inside wrong function "
"definition:\n");
printf("%p inside %s %p instead of %s %p\n",
ir,
this->current_function->name, this->current_function,
ir->function_name(), ir->function());
abort();
}
this->validate_ir(ir, this->data);
return visit_continue;
}
ir_visitor_status
ir_validate::visit(ir_variable *ir)
{
/* An ir_variable is the one thing that can (and will) appear multiple times
* in an IR tree. It is added to the hashtable so that it can be used
* in the ir_dereference_variable handler to ensure that a variable is
* declared before it is dereferenced.
*/
hash_table_insert(ht, ir, ir);
return visit_continue;
}
void
ir_validate::validate_ir(ir_instruction *ir, void *data)
{
struct hash_table *ht = (struct hash_table *) data;
if (hash_table_find(ht, ir)) {
printf("Instruction node present twice in ir tree:\n");
ir->print();
printf("\n");
abort();
}
hash_table_insert(ht, ir, ir);
}
void
validate_ir_tree(exec_list *instructions)
{
ir_validate v;
v.run(instructions);
}
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