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//===-- secondary.h ---------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef SCUDO_SECONDARY_H_
#define SCUDO_SECONDARY_H_
#include "common.h"
#include "mutex.h"
#include "stats.h"
#include "string_utils.h"
namespace scudo {
// This allocator wraps the platform allocation primitives, and as such is on
// the slower side and should preferably be used for larger sized allocations.
// Blocks allocated will be preceded and followed by a guard page, and hold
// their own header that is not checksummed: the guard pages and the Combined
// header should be enough for our purpose.
namespace LargeBlock {
struct Header {
LargeBlock::Header *Prev;
LargeBlock::Header *Next;
uptr BlockEnd;
uptr MapBase;
uptr MapSize;
MapPlatformData Data;
};
constexpr uptr getHeaderSize() {
return roundUpTo(sizeof(Header), 1U << SCUDO_MIN_ALIGNMENT_LOG);
}
static Header *getHeader(uptr Ptr) {
return reinterpret_cast<Header *>(Ptr - getHeaderSize());
}
static Header *getHeader(const void *Ptr) {
return getHeader(reinterpret_cast<uptr>(Ptr));
}
} // namespace LargeBlock
class MapAllocator {
public:
void initLinkerInitialized(GlobalStats *S) {
Stats.initLinkerInitialized();
if (LIKELY(S))
S->link(&Stats);
}
void init(GlobalStats *S) {
memset(this, 0, sizeof(*this));
initLinkerInitialized(S);
}
void *allocate(uptr Size, uptr AlignmentHint = 0, uptr *BlockEnd = nullptr);
void deallocate(void *Ptr);
static uptr getBlockEnd(void *Ptr) {
return LargeBlock::getHeader(Ptr)->BlockEnd;
}
static uptr getBlockSize(void *Ptr) {
return getBlockEnd(Ptr) - reinterpret_cast<uptr>(Ptr);
}
void getStats(ScopedString *Str) const;
void disable() { Mutex.lock(); }
void enable() { Mutex.unlock(); }
template <typename F> void iterateOverBlocks(F Callback) const {
for (LargeBlock::Header *H = Tail; H != nullptr; H = H->Prev)
Callback(reinterpret_cast<uptr>(H) + LargeBlock::getHeaderSize());
}
private:
HybridMutex Mutex;
LargeBlock::Header *Tail;
uptr AllocatedBytes;
uptr FreedBytes;
uptr LargestSize;
u32 NumberOfAllocs;
u32 NumberOfFrees;
LocalStats Stats;
};
} // namespace scudo
#endif // SCUDO_SECONDARY_H_
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