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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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76
crates/compiler/builtins/bitcode/src/main.zig
View file

@ -287,6 +287,82 @@ fn __roc_force_longjmp(a0: [*c]c_int, a1: c_int) callconv(.C) noreturn {
longjmp(a0, a1);
}
comptime {
if (builtin.os.tag == .windows) {
asm (
\\.global windows_longjmp;
\\windows_longjmp:
\\ movq 0x00(%rcx), %rdx
\\ movq 0x08(%rcx), %rbx
\\ # note 0x10 is not used yet!
\\ movq 0x18(%rcx), %rbp
\\ movq 0x20(%rcx), %rsi
\\ movq 0x28(%rcx), %rdi
\\ movq 0x30(%rcx), %r12
\\ movq 0x38(%rcx), %r13
\\ movq 0x40(%rcx), %r14
\\ movq 0x48(%rcx), %r15
\\
\\ # restore stack pointer
\\ movq 0x10(%rcx), %rsp
\\
\\ # load jmp address
\\ movq 0x50(%rcx), %r8
\\
\\ # set up return value
\\ movq %rbx, %rax
\\
\\ movdqu 0x60(%rcx), %xmm6
\\ movdqu 0x70(%rcx), %xmm7
\\ movdqu 0x80(%rcx), %xmm8
\\ movdqu 0x90(%rcx), %xmm9
\\ movdqu 0xa0(%rcx), %xmm10
\\ movdqu 0xb0(%rcx), %xmm11
\\ movdqu 0xc0(%rcx), %xmm12
\\ movdqu 0xd0(%rcx), %xmm13
\\ movdqu 0xe0(%rcx), %xmm14
\\ movdqu 0xf0(%rcx), %xmm15
\\
\\ jmp *%r8
\\
\\.global windows_setjmp;
\\windows_setjmp:
\\ movq %rdx, 0x00(%rcx)
\\ movq %rbx, 0x08(%rcx)
\\ # note 0x10 is not used yet!
\\ movq %rbp, 0x18(%rcx)
\\ movq %rsi, 0x20(%rcx)
\\ movq %rdi, 0x28(%rcx)
\\ movq %r12, 0x30(%rcx)
\\ movq %r13, 0x38(%rcx)
\\ movq %r14, 0x40(%rcx)
\\ movq %r15, 0x48(%rcx)
\\
\\ # the stack location right after the windows_setjmp call
\\ leaq 0x08(%rsp), %r8
\\ movq %r8, 0x10(%rcx)
\\
\\ movq (%rsp), %r8
\\ movq %r8, 0x50(%rcx)
\\
\\ movdqu %xmm6, 0x60(%rcx)
\\ movdqu %xmm7, 0x70(%rcx)
\\ movdqu %xmm8, 0x80(%rcx)
\\ movdqu %xmm9, 0x90(%rcx)
\\ movdqu %xmm10, 0xa0(%rcx)
\\ movdqu %xmm11, 0xb0(%rcx)
\\ movdqu %xmm12, 0xc0(%rcx)
\\ movdqu %xmm13, 0xd0(%rcx)
\\ movdqu %xmm14, 0xe0(%rcx)
\\ movdqu %xmm15, 0xf0(%rcx)
\\
\\ xorl %eax, %eax
\\ ret
\\
);
}
}
// Export helpers - Must be run inside a comptime
fn exportBuiltinFn(comptime func: anytype, comptime func_name: []const u8) void {
@export(func, .{ .name = "roc_builtins." ++ func_name, .linkage = .Strong });

3
crates/compiler/builtins/src/bitcode.rs
View file

@ -445,6 +445,9 @@ pub const NOTIFY_PARENT_EXPECT: &str = "roc_builtins.utils.notify_parent_expect"
pub const UTILS_LONGJMP: &str = "longjmp";
pub const UTILS_SETJMP: &str = "setjmp";
pub const UTILS_WINDOWS_LONGJMP: &str = "windows_longjmp";
pub const UTILS_WINDOWS_SETJMP: &str = "windows_setjmp";
#[derive(Debug, Default)]
pub struct IntToIntrinsicName {
pub options: [IntrinsicName; 10],

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(