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velzieandClaude Opus 5.5
99573180fc
Every C++ module had its own exception tag (from the C++ archives), so an exception thrown in a library was a different one in the program and went uncaught, and a program with a try block did not link against a C++ library at all: the library's exported landing-pad context is thread-local only in its own module. The tag is now libc.so's, imported by every shared module like setjmp's (a static program links it from libgexcc_eh.a), and libunwind comes ahead of the side modules so each module's landing pads use its own context. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_40f26e8988a74ea098d8bc80ff68287c
11 lines
561 B
ArmAsm
11 lines
561 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. In libgexcc_eh.a for a static program, and in libc.so
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# for a shared one and its libraries, which import it: an exception thrown
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# in one module is caught in another (with a tag of each module's own it
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# would be a different exception there).
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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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