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fix for bugged setjmp/longjmp on windows/llvm

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Folkert 2024-01-07 23:04:11 +01:00
parent 08ab7996a0
commit b9b19d6054
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4 changed files with 105 additions and 7 deletions
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22
crates/compiler/gen_llvm/src/llvm/build.rs
View file

@ -5066,6 +5066,11 @@ fn expose_function_to_host_help_c_abi<'a, 'ctx>(
}
pub fn get_sjlj_buffer<'ctx>(env: &Env<'_, 'ctx, '_>) -> PointerValue<'ctx> {
let word_type = match env.target_info.ptr_width() {
PtrWidth::Bytes4 => env.context.i32_type(),
PtrWidth::Bytes8 => env.context.i64_type(),
};
// The size of jump_buf is target-dependent.
// - AArch64 needs 3 machine-sized words
// - LLVM says the following about the SJLJ intrinsic:
@ -5077,11 +5082,15 @@ pub fn get_sjlj_buffer<'ctx>(env: &Env<'_, 'ctx, '_>) -> PointerValue<'ctx> {
// The following three words are available for use in a target-specific manner.
//
// So, let's create a 5-word buffer.
let word_type = match env.target_info.ptr_width() {
PtrWidth::Bytes4 => env.context.i32_type(),
PtrWidth::Bytes8 => env.context.i64_type(),
let size = if env.target_info.operating_system == roc_target::OperatingSystem::Windows {
// Due to https://github.com/llvm/llvm-project/issues/72908
// on windows, we store the register contents into this buffer directly!
30
} else {
5
};
let type_ = word_type.array_type(5);
let type_ = word_type.array_type(size);
let global = match env.module.get_global("roc_sjlj_buffer") {
Some(global) => global,
@ -5099,9 +5108,12 @@ pub fn get_sjlj_buffer<'ctx>(env: &Env<'_, 'ctx, '_>) -> PointerValue<'ctx> {
pub fn build_setjmp_call<'ctx>(env: &Env<'_, 'ctx, '_>) -> BasicValueEnum<'ctx> {
let jmp_buf = get_sjlj_buffer(env);
if cfg!(target_arch = "aarch64") {
if env.target_info.architecture == roc_target::Architecture::Aarch64 {
// Due to https://github.com/roc-lang/roc/issues/2965, we use a setjmp we linked in from Zig
call_bitcode_fn(env, &[jmp_buf.into()], bitcode::UTILS_SETJMP)
} else if env.target_info.operating_system == roc_target::OperatingSystem::Windows {
// Due to https://github.com/llvm/llvm-project/issues/72908, we use a setjmp defined as asm in Zig
call_bitcode_fn(env, &[jmp_buf.into()], bitcode::UTILS_WINDOWS_SETJMP)
} else {
// Anywhere else, use the LLVM intrinsic.
// https://llvm.org/docs/ExceptionHandling.html#llvm-eh-sjlj-setjmp

11
crates/compiler/gen_llvm/src/llvm/externs.rs
View file

@ -315,11 +315,18 @@ pub fn add_sjlj_roc_panic(env: &Env<'_, '_, '_>) {
pub fn build_longjmp_call(env: &Env) {
let jmp_buf = get_sjlj_buffer(env);
if cfg!(target_arch = "aarch64") {
// Call the Zig-linked longjmp: `void longjmp(i32*, i32)`
if env.target_info.architecture == roc_target::Architecture::Aarch64 {
// Due to https://github.com/roc-lang/roc/issues/2965, we use a setjmp we linked in from Zig
let tag = env.context.i32_type().const_int(1, false);
let _call =
call_void_bitcode_fn(env, &[jmp_buf.into(), tag.into()], bitcode::UTILS_LONGJMP);
} else if env.target_info.operating_system == roc_target::OperatingSystem::Windows {
let tag = env.context.i32_type().const_int(1, false);
let _call = call_void_bitcode_fn(
env,
&[jmp_buf.into(), tag.into()],
bitcode::UTILS_WINDOWS_LONGJMP,
);
} else {
// Call the LLVM-intrinsic longjmp: `void @llvm.eh.sjlj.longjmp(i8* %setjmp_buf)`
let jmp_buf_i8p = env.builder.new_build_pointer_cast(