blob: 09b9c14dacbe579a440355a16897642dafe0ca6f [file] [log] [blame]
// Copyright 2021 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "snapshot/linux/capture_memory_delegate_linux.h"
#include <utility>
#include "base/numerics/safe_conversions.h"
#include "snapshot/memory_snapshot_generic.h"
namespace crashpad {
namespace internal {
CaptureMemoryDelegateLinux::CaptureMemoryDelegateLinux(
ProcessReaderLinux* process_reader,
const ProcessReaderLinux::Thread* thread_opt,
std::vector<std::unique_ptr<MemorySnapshotGeneric>>* snapshots,
uint32_t* budget_remaining)
: stack_(thread_opt ? thread_opt->stack_region_address : 0,
thread_opt ? thread_opt->stack_region_size : 0),
process_reader_(process_reader),
snapshots_(snapshots),
budget_remaining_(budget_remaining) {}
bool CaptureMemoryDelegateLinux::Is64Bit() const {
return process_reader_->Is64Bit();
}
bool CaptureMemoryDelegateLinux::ReadMemory(uint64_t at,
uint64_t num_bytes,
void* into) const {
return process_reader_->Memory()->Read(
at, base::checked_cast<size_t>(num_bytes), into);
}
std::vector<CheckedRange<uint64_t>>
CaptureMemoryDelegateLinux::GetReadableRanges(
const CheckedRange<uint64_t, uint64_t>& range) const {
return process_reader_->GetMemoryMap()->GetReadableRanges(range);
}
void CaptureMemoryDelegateLinux::AddNewMemorySnapshot(
const CheckedRange<uint64_t, uint64_t>& range) {
// Don't bother storing this memory if it points back into the stack.
if (stack_.ContainsRange(range))
return;
if (range.size() == 0)
return;
if (!budget_remaining_ || *budget_remaining_ == 0)
return;
snapshots_->push_back(std::make_unique<internal::MemorySnapshotGeneric>());
internal::MemorySnapshotGeneric* snapshot = snapshots_->back().get();
snapshot->Initialize(process_reader_->Memory(), range.base(), range.size());
if (!base::IsValueInRangeForNumericType<int64_t>(range.size())) {
*budget_remaining_ = 0;
} else {
int64_t temp = *budget_remaining_;
temp -= range.size();
*budget_remaining_ = base::saturated_cast<uint32_t>(temp);
}
}
} // namespace internal
} // namespace crashpad