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Add support for a custom, per-instance signal handler (#620)

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* Per Instance signal handler

* add custom signal handler test

* add instance signal handling to callable.rs

* extend signal handler test to test callable.rs

* test multiple instances, multiple signal handlers

* support more than one current instance

import_calling_export.rs is a good example of why this is needed:
execution switches from one instance to another before the first one has
finished running

* add another custom signal handler test case

* move and update custom signal handler tests

* fmt

* fix libc version to 0.2

* call the correct instance signal handler

We keep a stack of instances so should call last() not first().

* move custom signal handler test to top level dir

* windows/mac signal handling wip

* os-specific signal handling wip

* disable custom signal handler test on windows

* fmt

* unify signal handling on mac and linux
This commit is contained in:
Maciej Woś
2020-01-08 17:09:12 -08:00
committed by Dan Gohman
parent 1fe76ef9e3
commit 61f9b8ade8
13 changed files with 510 additions and 13 deletions
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16
crates/runtime/signalhandlers/SignalHandlers.cpp
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@@ -467,9 +467,13 @@ WasmTrapHandler(LPEXCEPTION_POINTERS exception)
return EXCEPTION_CONTINUE_SEARCH;
}
if (!HandleTrap(exception->ContextRecord,
record->ExceptionCode == EXCEPTION_STACK_OVERFLOW)) {
return EXCEPTION_CONTINUE_SEARCH;
bool handled = InstanceSignalHandler(exception);
if (!handled) {
if (!HandleTrap(exception->ContextRecord,
record->ExceptionCode == EXCEPTION_STACK_OVERFLOW)) {
return EXCEPTION_CONTINUE_SEARCH;
}
}
return EXCEPTION_CONTINUE_EXECUTION;
@@ -633,11 +637,17 @@ WasmTrapHandler(int signum, siginfo_t* info, void* context)
if (!sAlreadyHandlingTrap) {
AutoHandlingTrap aht;
assert(signum == SIGSEGV || signum == SIGBUS || signum == SIGFPE || signum == SIGILL);
if (InstanceSignalHandler(signum, info, (ucontext_t*) context)) {
return;
}
if (HandleTrap(static_cast<CONTEXT*>(context), false)) {
return;
}
}
struct sigaction* previousSignal = nullptr;
switch (signum) {
case SIGSEGV: previousSignal = &sPrevSIGSEGVHandler; break;