https://github.com/aheejin created
https://github.com/llvm/llvm-project/pull/92192
This tries to make Wasm compilable in LLVM tree with CMake for non-Emscripten
platform.
This
- Adds `-D__USING_WASM_EXCEPTIONS__` when you compile with `-fwasm-exceptions`
(like other EH options) in Clang
- Exclude `UnwindLevel1.c` when compiling with Wasm
- Changed some `__USING_WASM_EXCEPTIONS__` to `__wasm__`; they should be
applied when compiling with Wasm w/o exceptions.
- Define some unused macros to make it compile
>From 95b9e56ac8bdd3b0bde08f63f64e35d47a61b784 Mon Sep 17 00:00:00 2001
From: Heejin Ahn <ahee...@gmail.com>
Date: Tue, 14 May 2024 22:08:20 +0000
Subject: [PATCH] [libunwind][WebAssembly] Make libunwind compilable
This tries to make Wasm compilable in LLVM tree with CMake for
non-Emscripten platform.
This
- Adds `-D__USING_WASM_EXCEPTIONS__` when you compile with
`-fwasm-exceptions` (like other EH options) in Clang
- Exclude `UnwindLevel1.c` when compiling with Wasm
- Changed some `__USING_WASM_EXCEPTIONS__` to `__wasm__`; they should be
applied when compiling with Wasm w/o exceptions.
- Define some unused macros to make it compile
---
clang/lib/Frontend/InitPreprocessor.cpp | 2 ++
libunwind/cmake/config-ix.cmake | 1 +
libunwind/include/__libunwind_config.h | 4 ++++
libunwind/src/UnwindLevel1.c | 3 ++-
libunwind/src/libunwind.cpp | 4 ++--
5 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp
b/clang/lib/Frontend/InitPreprocessor.cpp
index c1d209466ffe5..3cc85ff502776 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -1006,6 +1006,8 @@ static void InitializePredefinedMacros(const TargetInfo
&TI,
else if (LangOpts.hasDWARFExceptions() &&
(TI.getTriple().isThumb() || TI.getTriple().isARM()))
Builder.defineMacro("__ARM_DWARF_EH__");
+ else if (LangOpts.hasWasmExceptions())
+ Builder.defineMacro("__USING_WASM_EXCEPTIONS__");
if (LangOpts.Deprecated)
Builder.defineMacro("__DEPRECATED");
diff --git a/libunwind/cmake/config-ix.cmake b/libunwind/cmake/config-ix.cmake
index 126c872f0d489..d505ee1d346fa 100644
--- a/libunwind/cmake/config-ix.cmake
+++ b/libunwind/cmake/config-ix.cmake
@@ -109,6 +109,7 @@ check_cxx_compiler_flag(-nostdinc++
CXX_SUPPORTS_NOSTDINCXX_FLAG)
check_symbol_exists(__arm__ "" LIBUNWIND_TARGET_ARM)
check_symbol_exists(__USING_SJLJ_EXCEPTIONS__ ""
LIBUNWIND_USES_SJLJ_EXCEPTIONS)
check_symbol_exists(__ARM_DWARF_EH__ "" LIBUNWIND_USES_DWARF_EH)
+check_symbol_exists(__USING_WASM_EXCEPTIONS__ ""
LIBUNWIND_USES_WASM_EXCEPTIONS)
if(LIBUNWIND_TARGET_ARM AND NOT LIBUNWIND_USES_SJLJ_EXCEPTIONS AND NOT
LIBUNWIND_USES_DWARF_EH)
# This condition is copied from __libunwind_config.h
diff --git a/libunwind/include/__libunwind_config.h
b/libunwind/include/__libunwind_config.h
index 8db336b2d727c..7d87831a80446 100644
--- a/libunwind/include/__libunwind_config.h
+++ b/libunwind/include/__libunwind_config.h
@@ -180,6 +180,10 @@
#endif
#define _LIBUNWIND_HIGHEST_DWARF_REGISTER
\
_LIBUNWIND_HIGHEST_DWARF_REGISTER_LOONGARCH
+#elif defined(__wasm__)
+// Unused
+# define _LIBUNWIND_CONTEXT_SIZE 0
+# define _LIBUNWIND_CURSOR_SIZE 0
# else
# error "Unsupported architecture."
# endif
diff --git a/libunwind/src/UnwindLevel1.c b/libunwind/src/UnwindLevel1.c
index 05d0f2cb0a0a7..48e7bc3b9e00e 100644
--- a/libunwind/src/UnwindLevel1.c
+++ b/libunwind/src/UnwindLevel1.c
@@ -31,7 +31,8 @@
#include "libunwind_ext.h"
#include "unwind.h"
-#if !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__)
+#if !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__) &&
\
+ !defined(__wasm__)
#ifndef _LIBUNWIND_SUPPORT_SEH_UNWIND
diff --git a/libunwind/src/libunwind.cpp b/libunwind/src/libunwind.cpp
index 217dde9098637..7e5c6bd263e14 100644
--- a/libunwind/src/libunwind.cpp
+++ b/libunwind/src/libunwind.cpp
@@ -26,7 +26,7 @@
#include <sanitizer/asan_interface.h>
#endif
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__wasm__)
#include "AddressSpace.hpp"
#include "UnwindCursor.hpp"
@@ -348,7 +348,7 @@ void __unw_remove_dynamic_eh_frame_section(unw_word_t
eh_frame_start) {
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
#endif // !defined(__USING_SJLJ_EXCEPTIONS__) &&
- // !defined(__USING_WASM_EXCEPTIONS__)
+ // !defined(__wasm__)
#ifdef __APPLE__
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