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[WebAssembly] Define llvm-internal WasmEH tags in compiler-rt (#160959)

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The `__c_longjmp` and `__cpp_exceptions` tags are used internally by
llvm to implement setjmp/longjmp and C++ exception handling
respectively.

These symbols were previously defined weakly in each object file but
were recently converted to external references in #159143. They now need
to be defined somewhere in the runtime libraries. I think compiler-rt is
likely the most sensible place for them.
This commit is contained in:
Sam Clegg
2025-10-01 08:55:54 -07:00
committed by GitHub
parent 9f7e7f7d9c
commit aee99e8015
3 changed files with 58 additions and 5 deletions
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11
compiler-rt/lib/builtins/CMakeLists.txt
View File

@@ -816,14 +816,15 @@ set(s390x_SOURCES
${GENERIC_TF_SOURCES}
)
set(wasm32_SOURCES
${GENERIC_TF_SOURCES}
${GENERIC_SOURCES}
)
set(wasm64_SOURCES
set(wasm_SOURCES
wasm/__c_longjmp.S
wasm/__cpp_exceptions.S
${GENERIC_TF_SOURCES}
${GENERIC_SOURCES}
)
set(wasm32_SOURCES ${wasm_SOURCES})
set(wasm64_SOURCES ${wasm_SOURCES})
set(ve_SOURCES
ve/grow_stack.S

26
compiler-rt/lib/builtins/wasm/__c_longjmp.S Normal file
View File

@@ -0,0 +1,26 @@
//===-- __c_longjmp.S - Implement __c_longjmp -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements __c_longjmp which LLVM uses to implenmet setjmp/longjmp
// when Wasm EH is enabled.
//
//===----------------------------------------------------------------------===//
#ifdef __wasm_exception_handling__
#ifdef __wasm64__
#define PTR i64
#else
#define PTR i32
#endif
.globl __c_longjmp
.tagtype __c_longjmp PTR
__c_longjmp:
#endif // !__wasm_exception_handling__

26
compiler-rt/lib/builtins/wasm/__cpp_exception.S Normal file
View File

@@ -0,0 +1,26 @@
//===-- __cpp_exception.S - Implement __cpp_exception ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements __cpp_exception which LLVM uses to implement exception
// handling when Wasm EH is enabled.
//
//===----------------------------------------------------------------------===//
#ifdef __wasm_exception_handling__
#ifdef __wasm64__
#define PTR i64
#else
#define PTR i32
#endif
.globl __cpp_exception
.tagtype __cpp_exception PTR
__cpp_exception:
#endif // !__wasm_exception_handling__