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https://github.com/VectorCamp/vectorscan.git
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393 lines
12 KiB
C++
393 lines
12 KiB
C++
/*
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* Copyright (c) 2017, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "rose_build_impl.h"
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#include "nfa/castlecompile.h"
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#include "nfagraph/ng_repeat.h"
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#include "smallwrite/smallwrite_build.h"
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#include "util/compile_context.h"
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#include "util/boundary_reports.h"
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#include "util/report_manager.h"
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using namespace std;
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namespace ue2 {
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static
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bool requiresDedupe(const NGHolder &h, const flat_set<ReportID> &reports,
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const Grey &grey) {
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/* TODO: tighten */
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NFAVertex seen_vert = NGHolder::null_vertex();
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for (auto v : inv_adjacent_vertices_range(h.accept, h)) {
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if (has_intersection(h[v].reports, reports)) {
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if (seen_vert != NGHolder::null_vertex()) {
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return true;
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}
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seen_vert = v;
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}
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}
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for (auto v : inv_adjacent_vertices_range(h.acceptEod, h)) {
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if (has_intersection(h[v].reports, reports)) {
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if (seen_vert != NGHolder::null_vertex()) {
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return true;
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}
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seen_vert = v;
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}
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}
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if (seen_vert) {
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/* if the reporting vertex is part of of a terminal repeat, the
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* construction process may reform the graph splitting it into two
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* vertices (pos, cyclic) and hence require dedupe */
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vector<GraphRepeatInfo> repeats;
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findRepeats(h, grey.minExtBoundedRepeatSize, &repeats);
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for (const auto &repeat : repeats) {
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if (find(repeat.vertices.begin(), repeat.vertices.end(),
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seen_vert) != repeat.vertices.end()) {
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return true;
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}
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}
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}
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return false;
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}
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class RoseDedupeAuxImpl : public RoseDedupeAux {
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public:
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explicit RoseDedupeAuxImpl(const RoseBuildImpl &build_in);
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bool requiresDedupeSupport(
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const flat_set<ReportID> &reports) const override;
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private:
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bool hasSafeMultiReports(const flat_set<ReportID> &reports) const;
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const RoseBuildImpl &build;
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map<ReportID, set<RoseVertex>> vert_map; //!< ordinary literals
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map<ReportID, set<RoseVertex>> sb_vert_map; //!< small block literals
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map<ReportID, set<suffix_id>> suffix_map;
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map<ReportID, set<const OutfixInfo *>> outfix_map;
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map<ReportID, set<const raw_puff *>> puff_map;
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unordered_set<ReportID> live_reports; //!< all live internal reports.
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};
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unique_ptr<RoseDedupeAux> RoseBuildImpl::generateDedupeAux() const {
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return std::make_unique<RoseDedupeAuxImpl>(*this);
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}
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RoseDedupeAux::~RoseDedupeAux() = default;
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RoseDedupeAuxImpl::RoseDedupeAuxImpl(const RoseBuildImpl &build_in)
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: build(build_in) {
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const RoseGraph &g = build.g;
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set<suffix_id> suffixes;
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for (auto v : vertices_range(g)) {
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insert(&live_reports, g[v].reports);
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// Literals in the small block table are "shadow" copies of literals in
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// the other tables that do not run in the same runtime invocation.
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// Dedupe key assignment will be taken care of by the real literals.
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if (build.hasLiteralInTable(v, ROSE_ANCHORED_SMALL_BLOCK)) {
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for (const auto &report_id : g[v].reports) {
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sb_vert_map[report_id].insert(v);
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}
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} else {
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for (const auto &report_id : g[v].reports) {
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vert_map[report_id].insert(v);
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}
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}
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// Several vertices may share a suffix, so we collect the set of
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// suffixes first to avoid repeating work.
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if (g[v].suffix) {
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suffixes.insert(g[v].suffix);
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}
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}
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for (const auto &suffix : suffixes) {
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for (const auto &report_id : all_reports(suffix)) {
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suffix_map[report_id].insert(suffix);
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live_reports.insert(report_id);
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}
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}
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for (const auto &outfix : build.outfixes) {
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for (const auto &report_id : all_reports(outfix)) {
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outfix_map[report_id].insert(&outfix);
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live_reports.insert(report_id);
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}
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}
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if (build.mpv_outfix) {
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auto *mpv = build.mpv_outfix->mpv();
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for (const auto &puff : mpv->puffettes) {
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puff_map[puff.report].insert(&puff);
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live_reports.insert(puff.report);
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}
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for (const auto &puff : mpv->triggered_puffettes) {
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puff_map[puff.report].insert(&puff);
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live_reports.insert(puff.report);
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}
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}
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for (const auto &report_id : build.smwr.all_reports()) {
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live_reports.insert(report_id);
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}
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// Collect live reports from boundary reports.
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insert(&live_reports, build.boundary.report_at_0);
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insert(&live_reports, build.boundary.report_at_0_eod);
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insert(&live_reports, build.boundary.report_at_eod);
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DEBUG_PRINTF("%zu of %zu reports are live\n", live_reports.size(),
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build.rm.numReports());
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}
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static
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vector<CharReach> makePath(const rose_literal_id &lit) {
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vector<CharReach> path(begin(lit.s), end(lit.s));
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for (u32 i = 0; i < lit.delay; i++) {
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path.emplace_back(CharReach::dot());
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}
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return path;
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}
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/**
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* \brief True if one of the given literals overlaps with the suffix of
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* another, meaning that they could arrive at the same offset.
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*/
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static
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bool literalsCouldRace(const rose_literal_id &lit1,
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const rose_literal_id &lit2) {
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DEBUG_PRINTF("compare %s (delay %u) and %s (delay %u)\n",
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dumpString(lit1.s).c_str(), lit1.delay,
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dumpString(lit2.s).c_str(), lit2.delay);
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// Add dots on the end of each literal for delay.
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const auto v1 = makePath(lit1);
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const auto v2 = makePath(lit2);
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// See if the smaller path is a suffix of the larger path.
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const auto *smaller = v1.size() < v2.size() ? &v1 : &v2;
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const auto *bigger = v1.size() < v2.size() ? &v2 : &v1;
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auto r = mismatch(smaller->rbegin(), smaller->rend(), bigger->rbegin(),
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overlaps);
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return r.first == smaller->rend();
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}
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bool RoseDedupeAuxImpl::hasSafeMultiReports(
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const flat_set<ReportID> &reports) const {
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if (reports.size() <= 1) {
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return true;
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}
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/* We have more than one ReportID corresponding to the external ID that is
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* presented to the user. These may differ in offset adjustment, bounds
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* checks, etc. */
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/* TODO: work out if these differences will actually cause problems */
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/* One common case where we know we don't have a problem is if there are
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* precisely two reports, one for the main Rose path and one for the
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* "small block matcher" path. */
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if (reports.size() == 2) {
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ReportID id1 = *reports.begin();
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ReportID id2 = *reports.rbegin();
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bool has_verts_1 = contains(vert_map, id1);
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bool has_verts_2 = contains(vert_map, id2);
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bool has_sb_verts_1 = contains(sb_vert_map, id1);
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bool has_sb_verts_2 = contains(sb_vert_map, id2);
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if (has_verts_1 != has_verts_2 && has_sb_verts_1 != has_sb_verts_2) {
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DEBUG_PRINTF("two reports, one full and one small block: ok\n");
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return true;
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}
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}
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DEBUG_PRINTF("more than one report\n");
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return false;
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}
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bool RoseDedupeAuxImpl::requiresDedupeSupport(
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const flat_set<ReportID> &reports_in) const {
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/* TODO: this could be expanded to check for offset or character
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constraints */
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// We don't want to consider dead reports (tracked by ReportManager but no
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// longer used) for the purposes of assigning dupe keys.
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flat_set<ReportID> reports;
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for (auto id : reports_in) {
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if (contains(live_reports, id)) {
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reports.insert(id);
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}
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}
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DEBUG_PRINTF("live reports: %s\n", as_string_list(reports).c_str());
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const RoseGraph &g = build.g;
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bool has_suffix = false;
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bool has_outfix = false;
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if (!hasSafeMultiReports(reports)) {
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DEBUG_PRINTF("multiple reports not safe\n");
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return true;
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}
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set<RoseVertex> roles;
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set<suffix_id> suffixes;
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set<const OutfixInfo *> outfixes;
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set<const raw_puff *> puffettes;
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for (ReportID r : reports) {
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if (contains(vert_map, r)) {
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insert(&roles, vert_map.at(r));
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}
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if (contains(suffix_map, r)) {
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insert(&suffixes, suffix_map.at(r));
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}
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if (contains(outfix_map, r)) {
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insert(&outfixes, outfix_map.at(r));
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}
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if (contains(puff_map, r)) {
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insert(&puffettes, puff_map.at(r));
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}
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}
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/* roles */
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map<u32, u32> lits; // Literal ID -> count of occurrences.
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const bool has_role = !roles.empty();
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for (auto v : roles) {
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for (const auto &lit : g[v].literals) {
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lits[lit]++;
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}
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if (g[v].eod_accept) {
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// Literals plugged into this EOD accept must be taken into account
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// as well.
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for (auto u : inv_adjacent_vertices_range(v, g)) {
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for (const auto &lit : g[u].literals) {
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lits[lit]++;
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}
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}
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}
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}
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/* literals */
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for (const auto &m : lits) {
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if (m.second > 1) {
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DEBUG_PRINTF("lit %u used by >1 reporting roles\n", m.first);
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return true;
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}
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}
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for (auto it = begin(lits); it != end(lits); ++it) {
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const auto &lit1 = build.literals.at(it->first);
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for (auto jt = next(it); jt != end(lits); ++jt) {
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const auto &lit2 = build.literals.at(jt->first);
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if (literalsCouldRace(lit1, lit2)) {
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DEBUG_PRINTF("literals could race\n");
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return true;
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}
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}
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}
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/* suffixes */
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for (const auto &suffix : suffixes) {
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if (has_suffix || has_role) {
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return true; /* scope for badness */
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}
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has_suffix = true;
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/* some lesser suffix engines (nfas, haig, castle) can raise multiple
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* matches for a report id at the same offset if there are multiple
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* report states live. */
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if (suffix.haig()) {
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return true;
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}
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if (suffix.graph() &&
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requiresDedupe(*suffix.graph(), reports, build.cc.grey)) {
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return true;
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}
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if (suffix.castle() && requiresDedupe(*suffix.castle(), reports)) {
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return true;
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}
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}
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/* outfixes */
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for (const auto &outfix_ptr : outfixes) {
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assert(outfix_ptr);
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const OutfixInfo &out = *outfix_ptr;
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if (has_outfix || has_role || has_suffix) {
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return true;
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}
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has_outfix = true;
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if (out.haig()) {
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return true; /* haig may report matches with different SOM at the
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same offset */
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}
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if (out.holder() &&
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requiresDedupe(*out.holder(), reports, build.cc.grey)) {
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return true;
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}
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}
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/* mpv */
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for (UNUSED const auto &puff : puffettes) {
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if (has_outfix || has_role || has_suffix) {
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return true;
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}
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has_outfix = true;
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}
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/* boundary */
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if (has_intersection(build.boundary.report_at_eod, reports)) {
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if (has_outfix || has_role || has_suffix) {
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return true;
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}
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}
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return false;
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}
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} // namespace ue2
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