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authorTom Sepez <tsepez@chromium.org>2018-01-30 17:38:00 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-01-30 17:38:00 +0000
commite563e8352139e4852a955e319023b09f2844aee9 (patch)
treea323757e674ebab8ee7da05c169435e1062d1c26 /core/fxcrt
parent1917cdd8c90b977772cdee16cf496e56dce1a2ad (diff)
downloadpdfium-e563e8352139e4852a955e319023b09f2844aee9.tar.xz
Use UnownedPtr instead of T* in MaybeOwned.
Always check the liftime in the unowned case. Doing so unearthed the following issues: Transient lifetime issue in jbig2_image when doing realloc(). Stale (but unused) dictionary pointer in CPDF_Image. Destruction order in error branch in cpdf_dibsource.cpp Change-Id: I12b758aafeefedc7abe1e8b21a18db959929e95f Reviewed-on: https://pdfium-review.googlesource.com/24552 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
Diffstat (limited to 'core/fxcrt')
-rw-r--r--core/fxcrt/maybe_owned.h22
1 files changed, 16 insertions, 6 deletions
diff --git a/core/fxcrt/maybe_owned.h b/core/fxcrt/maybe_owned.h
index 11dd68642d..130d2bdc3c 100644
--- a/core/fxcrt/maybe_owned.h
+++ b/core/fxcrt/maybe_owned.h
@@ -11,6 +11,7 @@
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_system.h"
+#include "core/fxcrt/unowned_ptr.h"
namespace fxcrt {
@@ -33,25 +34,34 @@ class MaybeOwned {
}
void Reset(std::unique_ptr<T, D> ptr) {
+ m_pObj = ptr.get();
m_pOwnedObj = std::move(ptr);
- m_pObj = m_pOwnedObj.get();
}
void Reset(T* ptr = nullptr) {
- m_pOwnedObj.reset();
m_pObj = ptr;
+ m_pOwnedObj.reset();
}
+ T* Get() const { return m_pObj.Get(); }
bool IsOwned() const { return !!m_pOwnedObj; }
- T* Get() const { return m_pObj; }
+
+ // Downgrades to unowned, caller takes ownership.
std::unique_ptr<T, D> Release() {
ASSERT(IsOwned());
return std::move(m_pOwnedObj);
}
+ // Downgrades to empty, caller takes ownership.
+ std::unique_ptr<T, D> ReleaseAndClear() {
+ ASSERT(IsOwned());
+ m_pObj = nullptr;
+ return std::move(m_pOwnedObj);
+ }
+
MaybeOwned& operator=(const MaybeOwned& that) = delete;
MaybeOwned& operator=(MaybeOwned&& that) {
- m_pOwnedObj = std::move(that.m_pOwnedObj);
m_pObj = that.m_pObj;
+ m_pOwnedObj = std::move(that.m_pOwnedObj);
that.m_pObj = nullptr;
return *this;
}
@@ -78,11 +88,11 @@ class MaybeOwned {
explicit operator bool() const { return !!m_pObj; }
T& operator*() const { return *m_pObj; }
- T* operator->() const { return m_pObj; }
+ T* operator->() const { return m_pObj.Get(); }
private:
std::unique_ptr<T, D> m_pOwnedObj;
- T* m_pObj;
+ UnownedPtr<T> m_pObj;
};
} // namespace fxcrt