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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFixedAlloc.h"
SkFixedAlloc::SkFixedAlloc(void* ptr, size_t len)
: fStorage((char*)ptr), fCursor(fStorage), fEnd(fStorage + len) {}
void SkFixedAlloc::undo() {
// This function is essentially make() in reverse.
// First, read the Footer we stamped at the end.
Footer footer;
memcpy(&footer, fCursor - sizeof(Footer), sizeof(Footer));
Releaser releaser = (Releaser)((char*)Base + (footer >> 5));
ptrdiff_t padding = footer & 31;
fCursor = releaser(fCursor);
fCursor -= padding;
}
void SkFixedAlloc::reset() {
while (fCursor > fStorage) {
this->undo();
}
}
void SkFixedAlloc::Base() { }
SkFallbackAlloc::SkFallbackAlloc(SkFixedAlloc* fixed) : fFixedAlloc(fixed) {}
void SkFallbackAlloc::undo() {
if (fHeapAllocs.empty()) {
return fFixedAlloc->undo();
}
HeapAlloc alloc = fHeapAllocs.back();
alloc.deleter(alloc.ptr);
fHeapAllocs.pop_back();
}
void SkFallbackAlloc::reset() {
while (!fHeapAllocs.empty()) {
this->undo();
}
fFixedAlloc->reset();
}
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