forked from OSchip/llvm-project
109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
//===-- common.cpp ----------------------------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "gwp_asan/common.h"
|
|
#include "gwp_asan/stack_trace_compressor.h"
|
|
|
|
#include <assert.h>
|
|
|
|
using AllocationMetadata = gwp_asan::AllocationMetadata;
|
|
using Error = gwp_asan::Error;
|
|
|
|
namespace gwp_asan {
|
|
|
|
const char *ErrorToString(const Error &E) {
|
|
switch (E) {
|
|
case Error::UNKNOWN:
|
|
return "Unknown";
|
|
case Error::USE_AFTER_FREE:
|
|
return "Use After Free";
|
|
case Error::DOUBLE_FREE:
|
|
return "Double Free";
|
|
case Error::INVALID_FREE:
|
|
return "Invalid (Wild) Free";
|
|
case Error::BUFFER_OVERFLOW:
|
|
return "Buffer Overflow";
|
|
case Error::BUFFER_UNDERFLOW:
|
|
return "Buffer Underflow";
|
|
}
|
|
__builtin_trap();
|
|
}
|
|
|
|
constexpr size_t AllocationMetadata::kStackFrameStorageBytes;
|
|
constexpr size_t AllocationMetadata::kMaxTraceLengthToCollect;
|
|
|
|
void AllocationMetadata::RecordAllocation(uintptr_t AllocAddr,
|
|
size_t AllocSize) {
|
|
Addr = AllocAddr;
|
|
Size = AllocSize;
|
|
IsDeallocated = false;
|
|
|
|
AllocationTrace.ThreadID = getThreadID();
|
|
DeallocationTrace.TraceSize = 0;
|
|
DeallocationTrace.ThreadID = kInvalidThreadID;
|
|
}
|
|
|
|
void AllocationMetadata::RecordDeallocation() {
|
|
IsDeallocated = true;
|
|
DeallocationTrace.ThreadID = getThreadID();
|
|
}
|
|
|
|
void AllocationMetadata::CallSiteInfo::RecordBacktrace(
|
|
options::Backtrace_t Backtrace) {
|
|
TraceSize = 0;
|
|
if (!Backtrace)
|
|
return;
|
|
|
|
uintptr_t UncompressedBuffer[kMaxTraceLengthToCollect];
|
|
size_t BacktraceLength =
|
|
Backtrace(UncompressedBuffer, kMaxTraceLengthToCollect);
|
|
// Backtrace() returns the number of available frames, which may be greater
|
|
// than the number of frames in the buffer. In this case, we need to only pack
|
|
// the number of frames that are in the buffer.
|
|
if (BacktraceLength > kMaxTraceLengthToCollect)
|
|
BacktraceLength = kMaxTraceLengthToCollect;
|
|
TraceSize =
|
|
compression::pack(UncompressedBuffer, BacktraceLength, CompressedTrace,
|
|
AllocationMetadata::kStackFrameStorageBytes);
|
|
}
|
|
|
|
size_t AllocatorState::maximumAllocationSize() const { return PageSize; }
|
|
|
|
uintptr_t AllocatorState::slotToAddr(size_t N) const {
|
|
return GuardedPagePool + (PageSize * (1 + N)) + (maximumAllocationSize() * N);
|
|
}
|
|
|
|
bool AllocatorState::isGuardPage(uintptr_t Ptr) const {
|
|
assert(pointerIsMine(reinterpret_cast<void *>(Ptr)));
|
|
size_t PageOffsetFromPoolStart = (Ptr - GuardedPagePool) / PageSize;
|
|
size_t PagesPerSlot = maximumAllocationSize() / PageSize;
|
|
return (PageOffsetFromPoolStart % (PagesPerSlot + 1)) == 0;
|
|
}
|
|
|
|
static size_t addrToSlot(const AllocatorState *State, uintptr_t Ptr) {
|
|
size_t ByteOffsetFromPoolStart = Ptr - State->GuardedPagePool;
|
|
return ByteOffsetFromPoolStart /
|
|
(State->maximumAllocationSize() + State->PageSize);
|
|
}
|
|
|
|
size_t AllocatorState::getNearestSlot(uintptr_t Ptr) const {
|
|
if (Ptr <= GuardedPagePool + PageSize)
|
|
return 0;
|
|
if (Ptr > GuardedPagePoolEnd - PageSize)
|
|
return MaxSimultaneousAllocations - 1;
|
|
|
|
if (!isGuardPage(Ptr))
|
|
return addrToSlot(this, Ptr);
|
|
|
|
if (Ptr % PageSize <= PageSize / 2)
|
|
return addrToSlot(this, Ptr - PageSize); // Round down.
|
|
return addrToSlot(this, Ptr + PageSize); // Round up.
|
|
}
|
|
|
|
} // namespace gwp_asan
|