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Introduce the CallTarget enum

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This commit is contained in:
bjorn3 2021-07-26 14:40:27 +02:00
parent 02db151b00
commit 050b417a74
1 changed files with 31 additions and 21 deletions
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52
src/abi/mod.rs
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@ -9,7 +9,7 @@ use rustc_middle::ty::layout::FnAbiExt;
use rustc_target::abi::call::{Conv, FnAbi};
use rustc_target::spec::abi::Abi;
use cranelift_codegen::ir::AbiParam;
use cranelift_codegen::ir::{AbiParam, SigRef};
use smallvec::smallvec;
use self::pass_mode::*;
@ -380,9 +380,11 @@ pub(crate) fn codegen_terminator_call<'tcx>(
args.iter().map(|arg| codegen_operand(fx, arg)).collect::<Vec<_>>()
};
// | indirect call target
// | | the first argument to be passed
// v v
enum CallTarget {
Direct(FuncRef),
Indirect(SigRef, Value),
}
let (func_ref, first_arg) = match instance {
// Trait object call
Some(Instance { def: InstanceDef::Virtual(_, idx), .. }) => {
@ -390,20 +392,27 @@ pub(crate) fn codegen_terminator_call<'tcx>(
let nop_inst = fx.bcx.ins().nop();
fx.add_comment(
nop_inst,
format!("virtual call; self arg pass mode: {:?}", &fn_abi.args[0],),
format!("virtual call; self arg pass mode: {:?}", &fn_abi.args[0]),
);
}
let (ptr, method) = crate::vtable::get_ptr_and_method_ref(fx, args[0], idx);
(Some(method), smallvec![ptr])
let sig = clif_sig_from_fn_abi(fx.tcx, fx.triple(), &fn_abi);
let sig = fx.bcx.import_signature(sig);
(CallTarget::Indirect(sig, method), smallvec![ptr])
}
// Normal call
Some(_) => (
None,
args.get(0)
.map(|arg| adjust_arg_for_abi(fx, *arg, &fn_abi.args[0]))
.unwrap_or(smallvec![]),
),
Some(instance) => {
let func_ref = fx.get_function_ref(instance);
(
CallTarget::Direct(func_ref),
args.get(0)
.map(|arg| adjust_arg_for_abi(fx, *arg, &fn_abi.args[0]))
.unwrap_or(smallvec![]),
)
}
// Indirect call
None => {
@ -411,9 +420,13 @@ pub(crate) fn codegen_terminator_call<'tcx>(
let nop_inst = fx.bcx.ins().nop();
fx.add_comment(nop_inst, "indirect call");
}
let func = codegen_operand(fx, func).load_scalar(fx);
let sig = clif_sig_from_fn_abi(fx.tcx, fx.triple(), &fn_abi);
let sig = fx.bcx.import_signature(sig);
(
Some(func),
CallTarget::Indirect(sig, func),
args.get(0)
.map(|arg| adjust_arg_for_abi(fx, *arg, &fn_abi.args[0]))
.unwrap_or(smallvec![]),
@ -452,14 +465,11 @@ pub(crate) fn codegen_terminator_call<'tcx>(
assert_eq!(fn_abi.args.len(), regular_args_count);
}
let call_inst = if let Some(func_ref) = func_ref {
let sig = clif_sig_from_fn_abi(fx.tcx, fx.triple(), &fn_abi);
let sig = fx.bcx.import_signature(sig);
fx.bcx.ins().call_indirect(sig, func_ref, &call_args)
} else {
let func_ref =
fx.get_function_ref(instance.expect("non-indirect call on non-FnDef type"));
fx.bcx.ins().call(func_ref, &call_args)
let call_inst = match func_ref {
CallTarget::Direct(func_ref) => fx.bcx.ins().call(func_ref, &call_args),
CallTarget::Indirect(sig, func_ptr) => {
fx.bcx.ins().call_indirect(sig, func_ptr, &call_args)
}
};
(call_inst, call_args)