| 1 | // mycpp/bump_leak_heap.h: Leaky Bump Allocator
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| 2 |
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| 3 | #ifndef MYCPP_BUMP_LEAK_HEAP_H
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| 4 | #define MYCPP_BUMP_LEAK_HEAP_H
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| 5 |
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| 6 | #include <stdint.h> // int64_t
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| 7 |
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| 8 | #ifdef BUMP_ROOT
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| 9 | #include <algorithm> // max()
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| 10 | #include <vector>
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| 11 | #endif
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| 12 |
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| 13 | #include "mycpp/common.h"
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| 14 | #include "mycpp/gc_obj.h"
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| 15 |
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| 16 | class BumpLeakHeap {
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| 17 | public:
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| 18 | // reserve 32 frames to start
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| 19 | BumpLeakHeap() {
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| 20 | }
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| 21 |
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| 22 | void Init() {
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| 23 | }
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| 24 | void Init(int gc_threshold) {
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| 25 | }
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| 26 |
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| 27 | // the BumpLeakHeap doesn't need rooting, but provide the option to
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| 28 | // approximate its costs.
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| 29 | void PushRoot(RawObject** p) {
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| 30 | #ifdef BUMP_ROOT
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| 31 | roots_.push_back(p);
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| 32 | #endif
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| 33 | }
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| 34 | void PopRoot() {
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| 35 | #ifdef BUMP_ROOT
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| 36 | roots_.pop_back();
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| 37 | #endif
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| 38 | }
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| 39 |
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| 40 | void RootGlobalVar(void* root) {
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| 41 | }
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| 42 |
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| 43 | void* Allocate(size_t num_bytes);
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| 44 | void* Reallocate(void* p, size_t num_bytes);
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| 45 | int MaybeCollect() {
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| 46 | #ifdef BUMP_ROOT
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| 47 | // Do some computation with the roots
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| 48 | max_roots_ = std::max(max_roots_, static_cast<int>(roots_.size()));
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| 49 | #endif
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| 50 | return -1; // no collection attempted
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| 51 | }
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| 52 |
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| 53 | void PrintStats(int fd);
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| 54 |
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| 55 | void CleanProcessExit();
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| 56 | void ProcessExit();
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| 57 |
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| 58 | bool is_initialized_ = true; // mark/sweep doesn't need to be initialized
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| 59 |
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| 60 | // In number of live objects, since we aren't keeping track of total bytes
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| 61 | int gc_threshold_;
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| 62 | int mem_pos_ = 0;
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| 63 |
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| 64 | // Cumulative stats
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| 65 | int num_allocated_ = 0;
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| 66 | int64_t bytes_allocated_ = 0; // avoid overflow
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| 67 |
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| 68 | #ifdef BUMP_ROOT
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| 69 | std::vector<RawObject**> roots_;
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| 70 | int max_roots_ = 0;
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| 71 | #endif
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| 72 | };
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| 73 |
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| 74 | #ifdef BUMP_LEAK
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| 75 | extern BumpLeakHeap gHeap;
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| 76 | #endif
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| 77 |
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| 78 | #endif // MYCPP_BUMP_LEAK_HEAP_H
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