97ff297683
* Remove another thread local in `instance.rs` This commit removes another usage of `thread_local!` in the continued effort to centralize all thread-local state per-call (or basically state needed for traps) in one location. This removal is targeted at the support for custom signal handlers on instances, removing the previous stack of instances with instead a linked list of instances. The `with_signals_on` method is no longer necessary (since it was always called anyway) and is inferred from the first `vmctx` argument of the entrypoints into wasm. These functions establish a linked list of instances on the stack, if needed, to handle signals when they happen. This involved some refactoring where some C++ glue was moved into Rust, so now Rust handles a bit more of the signal handling logic. * Update some inline docs about `HandleTrap`
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#ifndef signal_handlers_h
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#define signal_handlers_h
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#include <stdint.h>
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#include <setjmp.h>
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#ifndef __cplusplus
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#include <stdbool.h>
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#endif
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#include <signal.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#include <winternl.h>
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void* HandleTrap(const uint8_t*, LPEXCEPTION_POINTERS);
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#else
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void* HandleTrap(const uint8_t*, int, siginfo_t *, void *);
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#endif
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void Unwind(void*);
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// This function performs the low-overhead signal handler initialization that we
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// want to do eagerly to ensure a more-deterministic global process state. This
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// is especially relevant for signal handlers since handler ordering depends on
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// installation order: the wasm signal handler must run *before* the other crash
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// handlers and since POSIX signal handlers work LIFO, this function needs to be
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// called at the end of the startup process, after other handlers have been
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// installed. This function can thus be called multiple times, having no effect
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// after the first call.
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int
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EnsureEagerSignalHandlers(void);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // signal_handlers_h
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