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Mirror of https://github.com/RPCS3/llvm-mirror
094815c89f
The implementation of `llvm_struct_name` before this diff calls `caml_copy_string`, which allocates, while the `result` local variable points to a block allocated by `caml_alloc_small` that has not yet been initialized. If the allocation in `caml_copy_string` triggers a garbage collection, then the GC root `result` contains a pointer to uninitialized data, which may crash the GC or lead to a memory corruption. This diff fixes this by allocating and initializing the string first and then allocating and initializing the option, thereby leaving no dangling pointers when allocations are made. The conversion from a C string to an OCaml string option is refactored into a function, `cstr_to_string_option`. This function is also used to simplify the definitions of `llvm_get_mdstring` and `llvm_string_of_const`. Differential Revision: https://reviews.llvm.org/D99393 |
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