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/*
* Copyright (c) 2015-2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief Component tree analysis that checks that references (such as
* back-refs, conditionals) have valid referents.
*/
#include "check_refs.h"
#include "ComponentBackReference.h"
#include "ComponentCondReference.h"
#include "ConstComponentVisitor.h"
#include "parse_error.h"
#include "util/container.h"
#include "util/flat_containers.h"
#include <sstream>
using namespace std;
namespace ue2 {
/**
* \brief Visitor that checks the validity of references against a known list
* of indices and labels.
*/
class ReferenceVisitor: public DefaultConstComponentVisitor {
private:
const size_t num_ids;
const flat_set<string> &names;
public:
ReferenceVisitor(size_t num_groups, const flat_set<string> &targets)
: num_ids(num_groups), names(targets) {}
~ReferenceVisitor() override;
void invalid_index(const char *component, unsigned id) {
assert(component);
ostringstream str;
str << "Invalid " << component << " to expression " << id << ".";
throw ParseError(str.str());
}
void invalid_label(const char *component, const std::string &label) {
assert(component);
ostringstream str;
str << "Invalid " << component << " to label '" << label << "'.";
throw ParseError(str.str());
}
using DefaultConstComponentVisitor::pre;
void pre(const ComponentBackReference &c) override {
if (c.ref_id) {
if (c.ref_id >= num_ids) {
invalid_index("back reference", c.ref_id);
}
} else {
if (!contains(names, c.name)) {
invalid_label("back reference", c.name);
}
}
}
void pre(const ComponentCondReference &c) override {
switch (c.kind) {
case ComponentCondReference::CONDITION_NUMBER:
if (c.ref_id >= num_ids) {
invalid_index("conditional reference", c.ref_id);
}
break;
case ComponentCondReference::CONDITION_NAME:
if (c.ref_name == "DEFINE") {
// The string "DEFINE" is a special "always false" condition
// used to define subroutines.
break;
}
if (!contains(names, c.ref_name)) {
invalid_label("conditional reference", c.ref_name);
}
break;
case ComponentCondReference::CONDITION_ASSERTION:
break;
}
}
};
// Out-of-line destructor to silence weak vtable warnings.
ReferenceVisitor::~ReferenceVisitor() {}
void checkReferences(const Component &root, unsigned int groupIndices,
const flat_set<std::string> &groupNames) {
ReferenceVisitor vis(groupIndices, groupNames);
root.accept(vis);
}
} // namespace ue2
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