infer_clone

History

Jia Chen a8897c2412 Properly model the copy semantics of NSString.stringWithUTF8String and NSString.stringWithString. Summary: Both `stringWithUTF8String` and `stringWithString` implements copy semantics that copies the content of their parameter into a newly allocated buffer. We modeled this as pointer assignment in the past, which means that once we write ``` NSString* foo() { char buf[...]; ... return [NSString stringWithUTF8String:buf]; } ``` We are going to get a spurious stack variable address escape report because local pointer `buf` is assigned to the newly created string and the string gets returned. This diff tries to address the issue by heap-allocating a buffer and `memcpy` the contents in `stringWithUTF8String` and `stringWithString`. But this change will create another problem: the allocated buffer will be reported as leaked by the backend, while in reality those buffers won't actually be leaked as they are allocated in a region that will be periodically autoreleased. To suppress spurious memory leak FPs, I added another attribute `Awont_leak` that will suppress the leakage report on any expressions that get tagged with it. Reviewed By: jeremydubreil Differential Revision: D5403084 fbshipit-source-id: df6de7f		8 years ago
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errors	Properly model the copy semantics of NSString.stringWithUTF8String and NSString.stringWithString.	8 years ago
frontend	Do not assign the hidden field when processing init list initialization for objective c	8 years ago
ioslints	[linters] Add a new linter UNAVAILABLE_CLASS_IN_SUPPORTED_IOS_SDK for checking unavailable classes in supported ios sdk	8 years ago
linters	[linters] Improve the error message in implicit cast error	8 years ago
linters-def-folder	[AL] Load AL files from a directory	8 years ago
linters-for-test-only	[linters] Predicate for checking enum constants	8 years ago
quandary	[make] make sure makefile uses config-time values	8 years ago
shared	[clang] Fix expression statement with conditional inside	8 years ago