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//! Helpers used to print a message and abort in case of certain panics and some detected UB.
use crate::prelude::*;
fn codegen_print(fx: &mut FunctionCx<'_, '_, '_>, msg: &str) {
let puts = fx
.module
.declare_function(
"puts",
Linkage::Import,
&Signature {
call_conv: fx.target_config.default_call_conv,
params: vec![AbiParam::new(fx.pointer_type)],
returns: vec![AbiParam::new(types::I32)],
},
)
.unwrap();
let puts = fx.module.declare_func_in_func(puts, &mut fx.bcx.func);
if fx.clif_comments.enabled() {
fx.add_comment(puts, "puts");
}
let real_msg = format!("trap at {:?} ({}): {}\0", fx.instance, fx.symbol_name, msg);
let msg_ptr = fx.anonymous_str(&real_msg);
fx.bcx.ins().call(puts, &[msg_ptr]);
}
/// Use this for example when a function call should never return. This will fill the current block,
/// so you can **not** add instructions to it afterwards.
///
/// Trap code: user65535
pub(crate) fn trap_unreachable(fx: &mut FunctionCx<'_, '_, '_>, msg: impl AsRef<str>) {
codegen_print(fx, msg.as_ref());
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
}
/// Use this when something is unimplemented, but `libcore` or `libstd` requires it to codegen.
/// Unlike `trap_unreachable` this will not fill the current block, so you **must** add instructions
/// to it afterwards.
///
/// Trap code: user65535
pub(crate) fn trap_unimplemented(fx: &mut FunctionCx<'_, '_, '_>, msg: impl AsRef<str>) {
codegen_print(fx, msg.as_ref());
let true_ = fx.bcx.ins().iconst(types::I32, 1);
fx.bcx.ins().trapnz(true_, TrapCode::User(!0));
}
/// Like `trap_unimplemented` but returns a fake value of the specified type.
///
/// Trap code: user65535
pub(crate) fn trap_unimplemented_ret_value<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
dest_layout: TyAndLayout<'tcx>,
msg: impl AsRef<str>,
) -> CValue<'tcx> {
trap_unimplemented(fx, msg);
CValue::by_ref(Pointer::const_addr(fx, 0), dest_layout)
}
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