cpp

Coverage Report

Created: 2023-09-13 01:07

/home/andy/git/oilshell/oil/mycpp/bump_leak_heap.h
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// mycpp/bump_leak_heap.h: Leaky Bump Allocator
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#ifndef MYCPP_BUMP_LEAK_HEAP_H
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#define MYCPP_BUMP_LEAK_HEAP_H
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#include <stdint.h>  // int64_t
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#ifdef BUMP_ROOT
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  #include <algorithm>  // max()
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  #include <vector>
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#endif
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#include "mycpp/common.h"
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#include "mycpp/gc_obj.h"
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class BumpLeakHeap {
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 public:
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  // reserve 32 frames to start
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  BumpLeakHeap() {
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  }
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  void Init() {
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  }
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  void Init(int gc_threshold) {
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  }
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  // the BumpLeakHeap doesn't need rooting, but provide the option to
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  // approximate its costs.
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  void PushRoot(RawObject** p) {
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#ifdef BUMP_ROOT
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    roots_.push_back(p);
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#endif
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  }
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  void PopRoot() {
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#ifdef BUMP_ROOT
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    roots_.pop_back();
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#endif
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  }
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  void RootGlobalVar(void* root) {
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  }
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  void* Allocate(size_t num_bytes);
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  void* Reallocate(void* p, size_t num_bytes);
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  int MaybeCollect() {
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#ifdef BUMP_ROOT
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    // Do some computation with the roots
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    max_roots_ = std::max(max_roots_, static_cast<int>(roots_.size()));
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#endif
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    return -1;  // no collection attempted
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  }
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  void PrintStats(int fd);
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  void CleanProcessExit();
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  void ProcessExit();
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  bool is_initialized_ = true;  // mark/sweep doesn't need to be initialized
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  // In number of live objects, since we aren't keeping track of total bytes
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  int gc_threshold_;
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  int mem_pos_ = 0;
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  // Cumulative stats
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  int num_allocated_ = 0;
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  int64_t bytes_allocated_ = 0;  // avoid overflow
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#ifdef BUMP_ROOT
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  std::vector<RawObject**> roots_;
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  int max_roots_ = 0;
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#endif
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};
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#ifdef BUMP_LEAK
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extern BumpLeakHeap gHeap;
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#endif
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#endif  // MYCPP_BUMP_LEAK_HEAP_H