+//! Codegen of a single function
+
use rustc_index::vec::IndexVec;
use rustc_middle::ty::adjustment::PointerCast;
+use rustc_middle::ty::layout::FnAbiExt;
+use rustc_target::abi::call::FnAbi;
use crate::prelude::*;
-pub(crate) fn trans_fn<'tcx, B: Backend + 'static>(
- cx: &mut crate::CodegenCx<'tcx, B>,
+pub(crate) fn codegen_fn<'tcx>(
+ cx: &mut crate::CodegenCx<'tcx, impl Module>,
instance: Instance<'tcx>,
linkage: Linkage,
) {
let tcx = cx.tcx;
+ let _inst_guard =
+ crate::PrintOnPanic(|| format!("{:?} {}", instance, tcx.symbol_name(instance).name));
+ debug_assert!(!instance.substs.needs_infer());
+
let mir = tcx.instance_mir(instance.def);
// Declare function
- let (name, sig) = get_function_name_and_sig(tcx, cx.module.isa().triple(), instance, false);
+ let name = tcx.symbol_name(instance).name.to_string();
+ let sig = get_function_sig(tcx, cx.module.isa().triple(), instance);
let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
cx.cached_context.clear();
instance,
mir,
+ fn_abi: Some(FnAbi::of_instance(&RevealAllLayoutCx(tcx), instance, &[])),
bcx,
block_map,
- local_map: FxHashMap::with_capacity_and_hasher(mir.local_decls.len(), Default::default()),
+ local_map: IndexVec::with_capacity(mir.local_decls.len()),
caller_location: None, // set by `codegen_fn_prelude`
cold_blocks: EntitySet::new(),
context.compute_domtree();
context.eliminate_unreachable_code(cx.module.isa()).unwrap();
context.dce(cx.module.isa()).unwrap();
+ // Some Cranelift optimizations expect the domtree to not yet be computed and as such don't
+ // invalidate it when it would change.
+ context.domtree.clear();
+
+ context.want_disasm = crate::pretty_clif::should_write_ir(tcx);
// Define function
let module = &mut cx.module;
&clif_comments,
);
+ if let Some(mach_compile_result) = &context.mach_compile_result {
+ if let Some(disasm) = &mach_compile_result.disasm {
+ crate::pretty_clif::write_ir_file(
+ tcx,
+ &format!("{}.vcode", tcx.symbol_name(instance).name),
+ |file| file.write_all(disasm.as_bytes()),
+ )
+ }
+ }
+
// Define debuginfo for function
let isa = cx.module.isa();
let debug_context = &mut cx.debug_context;
});
}
-fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
+fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Module>) {
crate::constant::check_constants(fx);
for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
fx.bcx.ins().nop();
for stmt in &bb_data.statements {
fx.set_debug_loc(stmt.source_info);
- trans_stmt(fx, block, stmt);
+ codegen_stmt(fx, block, stmt);
}
#[cfg(debug_assertions)]
continue;
}
}
- let cond = trans_operand(fx, cond).load_scalar(fx);
+ let cond = codegen_operand(fx, cond).load_scalar(fx);
let target = fx.get_block(*target);
let failure = fx.bcx.create_block();
fx.bcx.ins().jump(target, &[]);
fx.bcx.switch_to_block(failure);
+ fx.bcx.ins().nop();
- let location = fx
- .get_caller_location(bb_data.terminator().source_info.span)
- .load_scalar(fx);
-
- let args;
- let lang_item = match msg {
+ match msg {
AssertKind::BoundsCheck { ref len, ref index } => {
- let len = trans_operand(fx, len).load_scalar(fx);
- let index = trans_operand(fx, index).load_scalar(fx);
- args = [index, len, location];
- rustc_hir::LangItem::PanicBoundsCheck
+ let len = codegen_operand(fx, len).load_scalar(fx);
+ let index = codegen_operand(fx, index).load_scalar(fx);
+ let location = fx
+ .get_caller_location(bb_data.terminator().source_info.span)
+ .load_scalar(fx);
+
+ codegen_panic_inner(
+ fx,
+ rustc_hir::LangItem::PanicBoundsCheck,
+ &[index, len, location],
+ bb_data.terminator().source_info.span,
+ );
}
_ => {
let msg_str = msg.description();
- let msg_ptr = fx.anonymous_str("assert", msg_str);
- let msg_len = fx
- .bcx
- .ins()
- .iconst(fx.pointer_type, i64::try_from(msg_str.len()).unwrap());
- args = [msg_ptr, msg_len, location];
- rustc_hir::LangItem::Panic
+ codegen_panic(fx, msg_str, bb_data.terminator().source_info.span);
}
- };
-
- let def_id = fx.tcx.lang_items().require(lang_item).unwrap_or_else(|s| {
- fx.tcx
- .sess
- .span_fatal(bb_data.terminator().source_info.span, &s)
- });
-
- let instance = Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx);
- let symbol_name = fx.tcx.symbol_name(instance).name;
-
- fx.lib_call(
- &*symbol_name,
- vec![fx.pointer_type, fx.pointer_type, fx.pointer_type],
- vec![],
- &args,
- );
-
- crate::trap::trap_unreachable(fx, "panic lang item returned");
+ }
}
TerminatorKind::SwitchInt {
discr,
switch_ty,
- values,
targets,
} => {
- let discr = trans_operand(fx, discr).load_scalar(fx);
-
- if switch_ty.kind() == fx.tcx.types.bool.kind() {
- assert_eq!(targets.len(), 2);
- let then_block = fx.get_block(targets[0]);
- let else_block = fx.get_block(targets[1]);
- let test_zero = match **values {
- [0] => true,
- [1] => false,
- _ => unreachable!("{:?}", values),
+ let discr = codegen_operand(fx, discr).load_scalar(fx);
+
+ let use_bool_opt = switch_ty.kind() == fx.tcx.types.bool.kind()
+ || (targets.iter().count() == 1 && targets.iter().next().unwrap().0 == 0);
+ if use_bool_opt {
+ assert_eq!(targets.iter().count(), 1);
+ let (then_value, then_block) = targets.iter().next().unwrap();
+ let then_block = fx.get_block(then_block);
+ let else_block = fx.get_block(targets.otherwise());
+ let test_zero = match then_value {
+ 0 => true,
+ 1 => false,
+ _ => unreachable!("{:?}", targets),
};
let discr = crate::optimize::peephole::maybe_unwrap_bint(&mut fx.bcx, discr);
let discr = crate::optimize::peephole::maybe_unwrap_bint(&mut fx.bcx, discr);
let discr =
crate::optimize::peephole::make_branchable_value(&mut fx.bcx, discr);
- if test_zero {
- fx.bcx.ins().brz(discr, then_block, &[]);
- fx.bcx.ins().jump(else_block, &[]);
+ if let Some(taken) = crate::optimize::peephole::maybe_known_branch_taken(
+ &fx.bcx, discr, test_zero,
+ ) {
+ if taken {
+ fx.bcx.ins().jump(then_block, &[]);
+ } else {
+ fx.bcx.ins().jump(else_block, &[]);
+ }
} else {
- fx.bcx.ins().brnz(discr, then_block, &[]);
- fx.bcx.ins().jump(else_block, &[]);
+ if test_zero {
+ fx.bcx.ins().brz(discr, then_block, &[]);
+ fx.bcx.ins().jump(else_block, &[]);
+ } else {
+ fx.bcx.ins().brnz(discr, then_block, &[]);
+ fx.bcx.ins().jump(else_block, &[]);
+ }
}
} else {
let mut switch = ::cranelift_frontend::Switch::new();
- for (i, value) in values.iter().enumerate() {
- let block = fx.get_block(targets[i]);
- switch.set_entry(*value, block);
+ for (value, block) in targets.iter() {
+ let block = fx.get_block(block);
+ switch.set_entry(value, block);
}
- let otherwise_block = fx.get_block(targets[targets.len() - 1]);
+ let otherwise_block = fx.get_block(targets.otherwise());
switch.emit(&mut fx.bcx, discr, otherwise_block);
}
}
| TerminatorKind::FalseUnwind { .. }
| TerminatorKind::DropAndReplace { .. }
| TerminatorKind::GeneratorDrop => {
- bug!("shouldn't exist at trans {:?}", bb_data.terminator());
+ bug!("shouldn't exist at codegen {:?}", bb_data.terminator());
}
TerminatorKind::Drop {
place,
target,
unwind: _,
} => {
- let drop_place = trans_place(fx, *place);
+ let drop_place = codegen_place(fx, *place);
crate::abi::codegen_drop(fx, bb_data.terminator().source_info.span, drop_place);
let target_block = fx.get_block(*target);
fx.bcx.finalize();
}
-fn trans_stmt<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+fn codegen_stmt<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
#[allow(unused_variables)] cur_block: Block,
stmt: &Statement<'tcx>,
) {
place,
variant_index,
} => {
- let place = trans_place(fx, **place);
+ let place = codegen_place(fx, **place);
crate::discriminant::codegen_set_discriminant(fx, place, *variant_index);
}
StatementKind::Assign(to_place_and_rval) => {
- let lval = trans_place(fx, to_place_and_rval.0);
+ let lval = codegen_place(fx, to_place_and_rval.0);
let dest_layout = lval.layout();
- match &to_place_and_rval.1 {
- Rvalue::Use(operand) => {
- let val = trans_operand(fx, operand);
+ match to_place_and_rval.1 {
+ Rvalue::Use(ref operand) => {
+ let val = codegen_operand(fx, operand);
lval.write_cvalue(fx, val);
}
Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
- let place = trans_place(fx, *place);
+ let place = codegen_place(fx, place);
let ref_ = place.place_ref(fx, lval.layout());
lval.write_cvalue(fx, ref_);
}
Rvalue::ThreadLocalRef(def_id) => {
- let val = crate::constant::codegen_tls_ref(fx, *def_id, lval.layout());
+ let val = crate::constant::codegen_tls_ref(fx, def_id, lval.layout());
lval.write_cvalue(fx, val);
}
- Rvalue::BinaryOp(bin_op, lhs, rhs) => {
- let lhs = trans_operand(fx, lhs);
- let rhs = trans_operand(fx, rhs);
+ Rvalue::BinaryOp(bin_op, ref lhs, ref rhs) => {
+ let lhs = codegen_operand(fx, lhs);
+ let rhs = codegen_operand(fx, rhs);
- let res = crate::num::codegen_binop(fx, *bin_op, lhs, rhs);
+ let res = crate::num::codegen_binop(fx, bin_op, lhs, rhs);
lval.write_cvalue(fx, res);
}
- Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
- let lhs = trans_operand(fx, lhs);
- let rhs = trans_operand(fx, rhs);
+ Rvalue::CheckedBinaryOp(bin_op, ref lhs, ref rhs) => {
+ let lhs = codegen_operand(fx, lhs);
+ let rhs = codegen_operand(fx, rhs);
let res = if !fx.tcx.sess.overflow_checks() {
let val =
- crate::num::trans_int_binop(fx, *bin_op, lhs, rhs).load_scalar(fx);
+ crate::num::codegen_int_binop(fx, bin_op, lhs, rhs).load_scalar(fx);
let is_overflow = fx.bcx.ins().iconst(types::I8, 0);
CValue::by_val_pair(val, is_overflow, lval.layout())
} else {
- crate::num::trans_checked_int_binop(fx, *bin_op, lhs, rhs)
+ crate::num::codegen_checked_int_binop(fx, bin_op, lhs, rhs)
};
lval.write_cvalue(fx, res);
}
- Rvalue::UnaryOp(un_op, operand) => {
- let operand = trans_operand(fx, operand);
+ Rvalue::UnaryOp(un_op, ref operand) => {
+ let operand = codegen_operand(fx, operand);
let layout = operand.layout();
let val = operand.load_scalar(fx);
let res = match un_op {
UnOp::Neg => match layout.ty.kind() {
ty::Int(IntTy::I128) => {
// FIXME remove this case once ineg.i128 works
- let zero = CValue::const_val(fx, layout, 0);
- crate::num::trans_int_binop(fx, BinOp::Sub, zero, operand)
+ let zero =
+ CValue::const_val(fx, layout, ty::ScalarInt::null(layout.size));
+ crate::num::codegen_int_binop(fx, BinOp::Sub, zero, operand)
}
ty::Int(_) => CValue::by_val(fx.bcx.ins().ineg(val), layout),
ty::Float(_) => CValue::by_val(fx.bcx.ins().fneg(val), layout),
};
lval.write_cvalue(fx, res);
}
- Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, to_ty) => {
- let from_ty = fx.monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx));
+ Rvalue::Cast(
+ CastKind::Pointer(PointerCast::ReifyFnPointer),
+ ref operand,
+ to_ty,
+ ) => {
+ let from_ty = fx.monomorphize(operand.ty(&fx.mir.local_decls, fx.tcx));
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
match *from_ty.kind() {
ty::FnDef(def_id, substs) => {
_ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", from_ty),
}
}
- Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, to_ty)
- | Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, to_ty)
- | Rvalue::Cast(CastKind::Pointer(PointerCast::ArrayToPointer), operand, to_ty) => {
+ Rvalue::Cast(
+ CastKind::Pointer(PointerCast::UnsafeFnPointer),
+ ref operand,
+ to_ty,
+ )
+ | Rvalue::Cast(
+ CastKind::Pointer(PointerCast::MutToConstPointer),
+ ref operand,
+ to_ty,
+ )
+ | Rvalue::Cast(
+ CastKind::Pointer(PointerCast::ArrayToPointer),
+ ref operand,
+ to_ty,
+ ) => {
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
- let operand = trans_operand(fx, operand);
+ let operand = codegen_operand(fx, operand);
lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
}
- Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
- let operand = trans_operand(fx, operand);
+ Rvalue::Cast(CastKind::Misc, ref operand, to_ty) => {
+ let operand = codegen_operand(fx, operand);
let from_ty = operand.layout().ty;
let to_ty = fx.monomorphize(to_ty);
fn is_fat_ptr<'tcx>(
- fx: &FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &FunctionCx<'_, 'tcx, impl Module>,
ty: Ty<'tcx>,
) -> bool {
ty.builtin_deref(true)
use rustc_target::abi::{Int, TagEncoding, Variants};
- match &operand.layout().variants {
+ match operand.layout().variants {
Variants::Single { index } => {
let discr = operand
.layout()
.ty
- .discriminant_for_variant(fx.tcx, *index)
+ .discriminant_for_variant(fx.tcx, index)
.unwrap();
let discr = if discr.ty.is_signed() {
- rustc_middle::mir::interpret::sign_extend(
- discr.val,
- fx.layout_of(discr.ty).size,
- )
+ fx.layout_of(discr.ty).size.sign_extend(discr.val)
} else {
discr.val
};
+ let discr = discr.into();
let discr = CValue::const_val(fx, fx.layout_of(to_ty), discr);
lval.write_cvalue(fx, discr);
}
Variants::Multiple {
- tag,
+ ref tag,
tag_field,
tag_encoding: TagEncoding::Direct,
variants: _,
// Read the tag/niche-encoded discriminant from memory.
let encoded_discr =
- operand.value_field(fx, mir::Field::new(*tag_field));
+ operand.value_field(fx, mir::Field::new(tag_field));
let encoded_discr = encoded_discr.load_scalar(fx);
// Decode the discriminant (specifically if it's niche-encoded).
}
Rvalue::Cast(
CastKind::Pointer(PointerCast::ClosureFnPointer(_)),
- operand,
+ ref operand,
_to_ty,
) => {
- let operand = trans_operand(fx, operand);
+ let operand = codegen_operand(fx, operand);
match *operand.layout().ty.kind() {
ty::Closure(def_id, substs) => {
let instance = Instance::resolve_closure(
_ => bug!("{} cannot be cast to a fn ptr", operand.layout().ty),
}
}
- Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _to_ty) => {
- let operand = trans_operand(fx, operand);
+ Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), ref operand, _to_ty) => {
+ let operand = codegen_operand(fx, operand);
operand.unsize_value(fx, lval);
}
Rvalue::Discriminant(place) => {
- let place = trans_place(fx, *place);
+ let place = codegen_place(fx, place);
let value = place.to_cvalue(fx);
let discr =
crate::discriminant::codegen_get_discriminant(fx, value, dest_layout);
lval.write_cvalue(fx, discr);
}
- Rvalue::Repeat(operand, times) => {
- let operand = trans_operand(fx, operand);
+ Rvalue::Repeat(ref operand, times) => {
+ let operand = codegen_operand(fx, operand);
let times = fx
.monomorphize(times)
.eval(fx.tcx, ParamEnv::reveal_all())
fx.bcx.ins().jump(loop_block, &[index]);
fx.bcx.switch_to_block(done_block);
+ fx.bcx.ins().nop();
}
}
Rvalue::Len(place) => {
- let place = trans_place(fx, *place);
+ let place = codegen_place(fx, place);
let usize_layout = fx.layout_of(fx.tcx.types.usize);
let len = codegen_array_len(fx, place);
lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
CValue::const_val(fx, fx.layout_of(fx.tcx.types.usize), ty_size.into());
lval.write_cvalue(fx, val);
}
- Rvalue::Aggregate(kind, operands) => match **kind {
+ Rvalue::Aggregate(ref kind, ref operands) => match kind.as_ref() {
AggregateKind::Array(_ty) => {
- for (i, operand) in operands.into_iter().enumerate() {
- let operand = trans_operand(fx, operand);
+ for (i, operand) in operands.iter().enumerate() {
+ let operand = codegen_operand(fx, operand);
let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
let to = lval.place_index(fx, index);
to.write_cvalue(fx, operand);
}
}
- _ => unreachable!("shouldn't exist at trans {:?}", to_place_and_rval.1),
+ _ => unreachable!("shouldn't exist at codegen {:?}", to_place_and_rval.1),
},
}
}
assert!(!alignstack);
assert_eq!(inputs.len(), 2);
- let leaf = trans_operand(fx, &inputs[0].1).load_scalar(fx); // %eax
- let subleaf = trans_operand(fx, &inputs[1].1).load_scalar(fx); // %ecx
+ let leaf = codegen_operand(fx, &inputs[0].1).load_scalar(fx); // %eax
+ let subleaf = codegen_operand(fx, &inputs[1].1).load_scalar(fx); // %ecx
let (eax, ebx, ecx, edx) =
crate::intrinsics::codegen_cpuid_call(fx, leaf, subleaf);
assert_eq!(outputs.len(), 4);
- trans_place(fx, outputs[0])
+ codegen_place(fx, outputs[0])
.write_cvalue(fx, CValue::by_val(eax, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[1])
+ codegen_place(fx, outputs[1])
.write_cvalue(fx, CValue::by_val(ebx, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[2])
+ codegen_place(fx, outputs[2])
.write_cvalue(fx, CValue::by_val(ecx, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[3])
+ codegen_place(fx, outputs[3])
.write_cvalue(fx, CValue::by_val(edx, fx.layout_of(fx.tcx.types.u32)));
}
"xgetbv" => {
}
fn codegen_array_len<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
place: CPlace<'tcx>,
) -> Value {
match *place.layout().ty.kind() {
ty::Array(_elem_ty, len) => {
let len = fx
- .monomorphize(&len)
- .eval(fx.tcx, ParamEnv::reveal_all())
+ .monomorphize(len)
.eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
fx.bcx.ins().iconst(fx.pointer_type, len)
}
}
}
-pub(crate) fn trans_place<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_place<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
place: Place<'tcx>,
) -> CPlace<'tcx> {
let mut cplace = fx.get_local_place(place.local);
let ptr = cplace.to_ptr();
cplace = CPlace::for_ptr(
ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)),
- fx.layout_of(fx.tcx.mk_array(elem_ty, u64::from(to) - u64::from(from))),
+ fx.layout_of(fx.tcx.mk_array(elem_ty, to - from)),
);
}
ty::Slice(elem_ty) => {
cplace
}
-pub(crate) fn trans_operand<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_operand<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
operand: &Operand<'tcx>,
) -> CValue<'tcx> {
match operand {
Operand::Move(place) | Operand::Copy(place) => {
- let cplace = trans_place(fx, *place);
+ let cplace = codegen_place(fx, *place);
cplace.to_cvalue(fx)
}
- Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),
+ Operand::Constant(const_) => crate::constant::codegen_constant(fx, const_),
}
}
+
+pub(crate) fn codegen_panic<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ msg_str: &str,
+ span: Span,
+) {
+ let location = fx.get_caller_location(span).load_scalar(fx);
+
+ let msg_ptr = fx.anonymous_str("assert", msg_str);
+ let msg_len = fx
+ .bcx
+ .ins()
+ .iconst(fx.pointer_type, i64::try_from(msg_str.len()).unwrap());
+ let args = [msg_ptr, msg_len, location];
+
+ codegen_panic_inner(fx, rustc_hir::LangItem::Panic, &args, span);
+}
+
+pub(crate) fn codegen_panic_inner<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ lang_item: rustc_hir::LangItem,
+ args: &[Value],
+ span: Span,
+) {
+ let def_id = fx
+ .tcx
+ .lang_items()
+ .require(lang_item)
+ .unwrap_or_else(|s| fx.tcx.sess.span_fatal(span, &s));
+
+ let instance = Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx);
+ let symbol_name = fx.tcx.symbol_name(instance).name;
+
+ fx.lib_call(
+ &*symbol_name,
+ vec![
+ AbiParam::new(fx.pointer_type),
+ AbiParam::new(fx.pointer_type),
+ AbiParam::new(fx.pointer_type),
+ ],
+ vec![],
+ args,
+ );
+
+ crate::trap::trap_unreachable(fx, "panic lang item returned");
+}
projects / rust.git / blobdiff