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velzieandClaude Opus 5.5
417571d6e4
C++: build-cxx.sh builds libc++, libc++abi and libunwind from an LLVM tree into the sysroot; gexc++ compiles with -fwasm-exceptions plus -mllvm -wasm-enable-eh (clang turns the backend's EH lowering on only for emscripten; without it every catch was dropped). The __cpp_exception tag is cpp_exception.s. tests/gexcc/cxx.cpp: throws through frames with destructors, rethrow, std exceptions, RTTI, iostreams, std::thread. Signals: gex delivers them at a system call's return, so a loop that never calls the kernel never saw SIGALRM (findutils' configure hung in its alarm-guarded strcasestr check). The GexPoll pass plugin puts a countdown on every loop header (a per-thread wasm global); every 65536 back-edges __gex_poll (rt/, libgexcc.a) makes one getpid, where pending signals and expired timers are delivered. GEXCC_POLL=0 / -fno-gex-poll leaves it out. tests/gexcc/alarmloop.c: a handler and the default action both stop a busy loop (it hangs without the polls). Also: -Wl,--version for Meson, -print-prog-name, the TRIPLE-ld wrapper. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_685ed8fb0aed4f7099b7ecc34fc3b595
8 lines
318 B
ArmAsm
8 lines
318 B
ArmAsm
# The wasm exception tag C++ throws and catches with (LLVM's C++ EH lowering
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# and libunwind's Unwind-wasm.c refer to it; the runtime defines it, as
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# emscripten's libcxxabi/src/__cpp_exception.S does). wasm32: the payload is
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# a pointer, an i32.
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.globl __cpp_exception
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.tagtype __cpp_exception i32
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__cpp_exception:
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