transpile: Fix translation failures exposed by SQLite - #2001
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Translation units without declarations have no AST nodes to register their main file. Exporting comments then introduces a file ID absent from the file table, causing include-path lookup to panic. Register the main file before serializing the table so comments always refer to an exported file.
…ointers Exposed-provenance constructors require Sized pointees, but forward declarations become unsized extern types. Construct a c_void pointer first, then cast to the opaque pointer type while preserving its constness. This allows integer sentinel values and runtime addresses to initialize opaque pointers in both supported Rust editions.
… va_arg An enclosing cast can prevent Rust from inferring the destination of the transmute used for nullable function pointers. Pass the converted C type explicitly so va_arg results can be assigned through function pointer typedefs and struct fields.
Rust atomic intrinsics reject Option<fn>, the representation of nullable C function pointers. Convert atomic operands to raw pointers and convert results back to their function pointer type. Share the conversion between Clang atomic expressions and legacy __sync builtins. Preserve null callbacks, exchange and compare-exchange results, and the expected value written back after a failed comparison. Lock release stores a null raw pointer instead of an integer zero.
Default initialization does not handle CTypeKind::Atomic, so local _Atomic declarations fail to translate even when they have an explicit initializer. Delegate to the underlying value type to produce the initializer for the atomic storage.
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Fix five translation failures exposed by SQLite's individual source files:
c_voidpointers. Exposed-provenance constructors require sized pointees, while opaque extern types are unsized.va_arg. Enclosing casts can prevent Rust from inferring it.__sync_*builtins. Rust's atomic intrinsics reject theOption<fn>representation of nullable C callbacks._Atomicstorage through its underlying value type. Default initialization otherwise fails for local atomic declarations, including explicitly initialized ones.