97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
// Copyright 2018 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "snapshot/memory_snapshot.h"
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#include <algorithm>
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#include "base/format_macros.h"
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#include "base/logging.h"
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#include "base/strings/stringprintf.h"
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#include "util/numeric/checked_range.h"
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namespace crashpad {
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namespace {
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bool DetermineMergedRangeImpl(bool log,
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const MemorySnapshot* a,
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const MemorySnapshot* b,
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CheckedRange<uint64_t, size_t>* merged) {
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if (a->Size() == 0) {
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LOG_IF(ERROR, log) << base::StringPrintf(
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"invalid empty range at 0x%" PRIx64, a->Address());
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return false;
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}
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if (b->Size() == 0) {
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LOG_IF(ERROR, log) << base::StringPrintf(
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"invalid empty range at 0x%" PRIx64, b->Address());
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return false;
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}
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CheckedRange<uint64_t, size_t> range_a(a->Address(), a->Size());
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if (!range_a.IsValid()) {
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LOG_IF(ERROR, log) << base::StringPrintf("invalid range at 0x%" PRIx64
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", size %" PRIuS,
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range_a.base(),
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range_a.size());
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return false;
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}
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CheckedRange<uint64_t, size_t> range_b(b->Address(), b->Size());
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if (!range_b.IsValid()) {
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LOG_IF(ERROR, log) << base::StringPrintf("invalid range at 0x%" PRIx64
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", size %" PRIuS,
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range_b.base(),
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range_b.size());
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return false;
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}
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if (!range_a.OverlapsRange(range_b) && range_a.end() != range_b.base() &&
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range_b.end() != range_a.base()) {
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LOG_IF(ERROR, log) << base::StringPrintf(
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"ranges not overlapping or abutting: (0x%" PRIx64 ", size %" PRIuS
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") and (0x%" PRIx64 ", size %" PRIuS ")",
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range_a.base(),
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range_a.size(),
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range_b.base(),
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range_b.size());
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return false;
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}
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if (merged) {
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uint64_t base = std::min(range_a.base(), range_b.base());
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uint64_t end = std::max(range_a.end(), range_b.end());
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size_t size = static_cast<size_t>(end - base);
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merged->SetRange(base, size);
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}
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return true;
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}
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} // namespace
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bool LoggingDetermineMergedRange(const MemorySnapshot* a,
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const MemorySnapshot* b,
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CheckedRange<uint64_t, size_t>* merged) {
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return DetermineMergedRangeImpl(true, a, b, merged);
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}
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bool DetermineMergedRange(const MemorySnapshot* a,
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const MemorySnapshot* b,
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CheckedRange<uint64_t, size_t>* merged) {
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return DetermineMergedRangeImpl(false, a, b, merged);
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}
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} // namespace crashpad
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