-use rustc_middle::ty::adjustment::PointerCast;
+//! Codegen of a single function
+
+use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
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::constant::ConstantCx;
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>,
+ module: &mut dyn 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 func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
+ let symbol_name = tcx.symbol_name(instance);
+ let sig = get_function_sig(tcx, module.isa().triple(), instance);
+ let func_id = module.declare_function(symbol_name.name, Linkage::Local, &sig).unwrap();
cx.cached_context.clear();
// Predefine blocks
let start_block = bcx.create_block();
- let block_map: IndexVec<BasicBlock, Block> = (0..mir.basic_blocks().len()).map(|_| bcx.create_block()).collect();
+ let block_map: IndexVec<BasicBlock, Block> =
+ (0..mir.basic_blocks().len()).map(|_| bcx.create_block()).collect();
// Make FunctionCx
- let pointer_type = cx.module.target_config().pointer_type();
+ let pointer_type = module.target_config().pointer_type();
let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
let mut fx = FunctionCx {
cx,
+ module,
tcx,
pointer_type,
+ vtables: FxHashMap::default(),
+ constants_cx: ConstantCx::new(),
instance,
+ symbol_name,
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(),
clif_comments,
source_info_set: indexmap::IndexSet::new(),
inline_asm_index: 0,
};
- let arg_uninhabited = fx.mir.args_iter().any(|arg| fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
+ let arg_uninhabited = fx
+ .mir
+ .args_iter()
+ .any(|arg| fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
- if arg_uninhabited {
+ if !crate::constant::check_constants(&mut fx) {
+ fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
+ fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
+ crate::trap::trap_unreachable(&mut fx, "compilation should have been aborted");
+ } else if arg_uninhabited {
fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
crate::trap::trap_unreachable(&mut fx, "function has uninhabited argument");
} else {
tcx.sess.time("codegen clif ir", || {
- tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block));
+ tcx.sess
+ .time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block));
codegen_fn_content(&mut fx);
});
}
let mut clif_comments = fx.clif_comments;
let source_info_set = fx.source_info_set;
let local_map = fx.local_map;
- let cold_blocks = fx.cold_blocks;
+
+ fx.constants_cx.finalize(fx.tcx, &mut *fx.module);
// Store function in context
let context = &mut cx.cached_context;
context.func = func;
- crate::pretty_clif::write_clif_file(
- tcx,
- "unopt",
- None,
- instance,
- &context,
- &clif_comments,
- );
+ crate::pretty_clif::write_clif_file(tcx, "unopt", None, instance, &context, &clif_comments);
// Verify function
verify_func(tcx, &clif_comments, &context.func);
// Perform rust specific optimizations
tcx.sess.time("optimize clif ir", || {
- crate::optimize::optimize_function(tcx, instance, context, &cold_blocks, &mut clif_comments);
+ crate::optimize::optimize_function(tcx, instance, context, &mut clif_comments);
});
- // If the return block is not reachable, then the SSA builder may have inserted a `iconst.i128`
+ // If the return block is not reachable, then the SSA builder may have inserted an `iconst.i128`
// instruction, which doesn't have an encoding.
context.compute_cfg();
context.compute_domtree();
- context.eliminate_unreachable_code(cx.module.isa()).unwrap();
+ context.eliminate_unreachable_code(module.isa()).unwrap();
+ context.dce(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;
- tcx.sess.time(
- "define function",
- || module.define_function(
- func_id,
- context,
- &mut cranelift_codegen::binemit::NullTrapSink {},
- ).unwrap(),
- );
+ tcx.sess.time("define function", || {
+ module
+ .define_function(func_id, context, &mut NullTrapSink {}, &mut NullStackMapSink {})
+ .unwrap()
+ });
// Write optimized function to file for debugging
crate::pretty_clif::write_clif_file(
tcx,
"opt",
- Some(cx.module.isa()),
+ Some(module.isa()),
instance,
&context,
&clif_comments,
);
+ if let Some(disasm) = &context.mach_compile_result.as_ref().unwrap().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 isa = module.isa();
let debug_context = &mut cx.debug_context;
let unwind_context = &mut cx.unwind_context;
tcx.sess.time("generate debug info", || {
if let Some(debug_context) = debug_context {
- debug_context.define_function(instance, func_id, &name, isa, context, &source_info_set, local_map);
+ debug_context.define_function(
+ instance,
+ func_id,
+ symbol_name.name,
+ isa,
+ context,
+ &source_info_set,
+ local_map,
+ );
}
unwind_context.add_function(func_id, &context, isa);
});
context.clear();
}
-pub(crate) fn verify_func(tcx: TyCtxt<'_>, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
+pub(crate) fn verify_func(
+ tcx: TyCtxt<'_>,
+ writer: &crate::pretty_clif::CommentWriter,
+ func: &Function,
+) {
tcx.sess.time("verify clif ir", || {
let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::settings::builder());
match cranelift_codegen::verify_function(&func, &flags) {
Some(Box::new(writer)),
err,
);
- tcx.sess
- .fatal(&format!("cranelift verify error:\n{}", pretty_error));
+ tcx.sess.fatal(&format!("cranelift verify error:\n{}", pretty_error));
}
}
});
}
-fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
- crate::constant::check_constants(fx);
-
+fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, '_>) {
for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
let block = fx.get_block(bb);
fx.bcx.switch_to_block(block);
// Unwinding after panicking is not supported
continue;
- // FIXME once unwinding is supported uncomment next lines
- // // Unwinding is unlikely to happen, so mark cleanup block's as cold.
- // fx.cold_blocks.insert(block);
+ // FIXME Once unwinding is supported and Cranelift supports marking blocks as cold, do
+ // so for cleanup blocks.
}
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)]
- {
+ if fx.clif_comments.enabled() {
let mut terminator_head = "\n".to_string();
- bb_data
- .terminator()
- .kind
- .fmt_head(&mut terminator_head)
- .unwrap();
+ bb_data.terminator().kind.fmt_head(&mut terminator_head).unwrap();
let inst = fx.bcx.func.layout.last_inst(block).unwrap();
fx.add_comment(inst, terminator_head);
}
TerminatorKind::Return => {
crate::abi::codegen_return(fx);
}
- TerminatorKind::Assert {
- cond,
- expected,
- msg,
- target,
- cleanup: _,
- } => {
+ TerminatorKind::Assert { cond, expected, msg, target, cleanup: _ } => {
if !fx.tcx.sess.overflow_checks() {
if let mir::AssertKind::OverflowNeg(_) = *msg {
let target = fx.get_block(*target);
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.cold_blocks.insert(failure);
+ // FIXME Mark failure block as cold once Cranelift supports it
if *expected {
fx.bcx.ins().brz(cond, failure, &[]);
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::lang_items::PanicBoundsCheckFnLangItem
+ 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::lang_items::PanicFnLangItem
+ 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);
- 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);
+ TerminatorKind::SwitchInt { discr, switch_ty, targets } => {
+ 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, is_inverted) =
+ crate::optimize::peephole::maybe_unwrap_bool_not(&mut fx.bcx, discr);
+ let test_zero = if is_inverted { !test_zero } else { test_zero };
+ 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 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 {
+ 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 (value, block) in targets.iter() {
+ let block = fx.get_block(block);
+ switch.set_entry(value, block);
+ }
+ let otherwise_block = fx.get_block(targets.otherwise());
+ switch.emit(&mut fx.bcx, discr, otherwise_block);
}
- let otherwise_block = fx.get_block(targets[targets.len() - 1]);
- switch.emit(&mut fx.bcx, discr, otherwise_block);
}
TerminatorKind::Call {
func,
cleanup: _,
from_hir_call: _,
} => {
- fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
- fx,
- *fn_span,
- block,
- func,
- args,
- *destination,
- ));
+ fx.tcx.sess.time("codegen call", || {
+ crate::abi::codegen_terminator_call(fx, *fn_span, func, args, *destination)
+ });
}
TerminatorKind::InlineAsm {
template,
fx.bcx.ins().jump(destination_block, &[]);
}
None => {
- crate::trap::trap_unreachable(fx, "[corruption] Returned from noreturn inline asm");
+ crate::trap::trap_unreachable(
+ fx,
+ "[corruption] Returned from noreturn inline asm",
+ );
}
}
}
| 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);
+ TerminatorKind::Drop { place, target, unwind: _ } => {
+ 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>,
- #[allow(unused_variables)]
- cur_block: Block,
+fn codegen_stmt<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ #[allow(unused_variables)] cur_block: Block,
stmt: &Statement<'tcx>,
) {
let _print_guard = crate::PrintOnPanic(|| format!("stmt {:?}", stmt));
fx.set_debug_loc(stmt.source_info);
- #[cfg(false_debug_assertions)]
+ #[cfg(disabled)]
match &stmt.kind {
StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
_ => {
- let inst = fx.bcx.func.layout.last_inst(cur_block).unwrap();
- fx.add_comment(inst, format!("{:?}", stmt));
+ if fx.clif_comments.enabled() {
+ let inst = fx.bcx.func.layout.last_inst(cur_block).unwrap();
+ fx.add_comment(inst, format!("{:?}", stmt));
+ }
}
}
match &stmt.kind {
- StatementKind::SetDiscriminant {
- place,
- variant_index,
- } => {
- let place = trans_place(fx, **place);
+ StatementKind::SetDiscriminant { place, variant_index } => {
+ 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_rhs) => {
+ let lhs = codegen_operand(fx, &lhs_rhs.0);
+ let rhs = codegen_operand(fx, &lhs_rhs.1);
- 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_rhs) => {
+ let lhs = codegen_operand(fx, &lhs_rhs.0);
+ let rhs = codegen_operand(fx, &lhs_rhs.1);
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::Not => {
- match layout.ty.kind {
- ty::Bool => {
- let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
- CValue::by_val(fx.bcx.ins().bint(types::I8, res), layout)
- }
- ty::Uint(_) | ty::Int(_) => {
- CValue::by_val(fx.bcx.ins().bnot(val), layout)
- }
- _ => unreachable!("un op Not for {:?}", layout.ty),
+ UnOp::Not => match layout.ty.kind() {
+ ty::Bool => {
+ let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
+ CValue::by_val(fx.bcx.ins().bint(types::I8, res), layout)
}
- }
- UnOp::Neg => match layout.ty.kind {
+ ty::Uint(_) | ty::Int(_) => {
+ CValue::by_val(fx.bcx.ins().bnot(val), layout)
+ }
+ _ => unreachable!("un op Not for {:?}", layout.ty),
+ },
+ 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)
- }
- ty::Int(_) => {
- CValue::by_val(fx.bcx.ins().ineg(val), layout)
- }
- ty::Float(_) => {
- CValue::by_val(fx.bcx.ins().fneg(val), layout)
+ 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),
_ => unreachable!("un op Neg for {:?}", layout.ty),
},
};
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 {
+ match *from_ty.kind() {
ty::FnDef(def_id, substs) => {
let func_ref = fx.get_function_ref(
- Instance::resolve_for_fn_ptr(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
- .unwrap()
- .polymorphize(fx.tcx),
+ Instance::resolve_for_fn_ptr(
+ fx.tcx,
+ ParamEnv::reveal_all(),
+ def_id,
+ substs,
+ )
+ .unwrap()
+ .polymorphize(fx.tcx),
);
let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
lval.write_cvalue(fx, CValue::by_val(func_addr, to_layout));
_ => 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>,
- ty: Ty<'tcx>,
- ) -> bool {
+ fn is_fat_ptr<'tcx>(fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
ty.builtin_deref(true)
- .map(
- |ty::TypeAndMut {
- ty: pointee_ty,
- mutbl: _,
- }| has_ptr_meta(fx.tcx, pointee_ty),
- )
+ .map(|ty::TypeAndMut { ty: pointee_ty, mutbl: _ }| {
+ has_ptr_meta(fx.tcx, pointee_ty)
+ })
.unwrap_or(false)
}
let (ptr, _extra) = operand.load_scalar_pair(fx);
lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
}
- } else if let ty::Adt(adt_def, _substs) = from_ty.kind {
+ } else if let ty::Adt(adt_def, _substs) = from_ty.kind() {
// enum -> discriminant value
assert!(adt_def.is_enum());
- match to_ty.kind {
+ match to_ty.kind() {
ty::Uint(_) | ty::Int(_) => {}
_ => unreachable!("cast adt {} -> {}", from_ty, to_ty),
}
+ let to_clif_ty = fx.clif_type(to_ty).unwrap();
- use rustc_target::abi::{TagEncoding, Int, Variants};
-
- match &operand.layout().variants {
- Variants::Single { index } => {
- let discr = operand.layout().ty.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)
- } else {
- discr.val
- };
+ let discriminant = crate::discriminant::codegen_get_discriminant(
+ fx,
+ operand,
+ fx.layout_of(operand.layout().ty.discriminant_ty(fx.tcx)),
+ )
+ .load_scalar(fx);
- let discr = CValue::const_val(fx, fx.layout_of(to_ty), discr);
- lval.write_cvalue(fx, discr);
- }
- Variants::Multiple {
- tag,
- tag_field,
- tag_encoding: TagEncoding::Direct,
- variants: _,
- } => {
- let cast_to = fx.clif_type(dest_layout.ty).unwrap();
-
- // Read the tag/niche-encoded discriminant from memory.
- let encoded_discr = 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).
- let signed = match tag.value {
- Int(_, signed) => signed,
- _ => false,
- };
- let val = clif_intcast(fx, encoded_discr, cast_to, signed);
- let val = CValue::by_val(val, dest_layout);
- lval.write_cvalue(fx, val);
- }
- Variants::Multiple { ..} => unreachable!(),
- }
+ let res = crate::cast::clif_intcast(
+ fx,
+ discriminant,
+ to_clif_ty,
+ to_ty.is_signed(),
+ );
+ lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
} else {
let to_clif_ty = fx.clif_type(to_ty).unwrap();
let from = operand.load_scalar(fx);
lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
}
}
- Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _to_ty) => {
- let operand = trans_operand(fx, operand);
- match operand.layout().ty.kind {
+ Rvalue::Cast(
+ CastKind::Pointer(PointerCast::ClosureFnPointer(_)),
+ ref operand,
+ _to_ty,
+ ) => {
+ let operand = codegen_operand(fx, operand);
+ match *operand.layout().ty.kind() {
ty::Closure(def_id, substs) => {
let instance = Instance::resolve_closure(
fx.tcx,
def_id,
substs,
ty::ClosureKind::FnOnce,
- ).polymorphize(fx.tcx);
+ )
+ .polymorphize(fx.tcx);
let func_ref = fx.get_function_ref(instance);
let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
_ => 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())
.val
.try_to_bits(fx.tcx.data_layout.pointer_size)
.unwrap();
- for i in 0..times {
- let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
+ if operand.layout().size.bytes() == 0 {
+ // Do nothing for ZST's
+ } else if fx.clif_type(operand.layout().ty) == Some(types::I8) {
+ let times = fx.bcx.ins().iconst(fx.pointer_type, times as i64);
+ // FIXME use emit_small_memset where possible
+ let addr = lval.to_ptr().get_addr(fx);
+ let val = operand.load_scalar(fx);
+ fx.bcx.call_memset(fx.module.target_config(), addr, val, times);
+ } else {
+ let loop_block = fx.bcx.create_block();
+ let loop_block2 = fx.bcx.create_block();
+ let done_block = fx.bcx.create_block();
+ let index = fx.bcx.append_block_param(loop_block, fx.pointer_type);
+ let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
+ fx.bcx.ins().jump(loop_block, &[zero]);
+
+ fx.bcx.switch_to_block(loop_block);
+ let done = fx.bcx.ins().icmp_imm(IntCC::Equal, index, times as i64);
+ fx.bcx.ins().brnz(done, done_block, &[]);
+ fx.bcx.ins().jump(loop_block2, &[]);
+
+ fx.bcx.switch_to_block(loop_block2);
let to = lval.place_index(fx, index);
to.write_cvalue(fx, operand);
+ let index = fx.bcx.ins().iadd_imm(index, 1);
+ 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));
}
Rvalue::NullaryOp(NullOp::Box, content_ty) => {
- use rustc_hir::lang_items::ExchangeMallocFnLangItem;
-
let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
let content_ty = fx.monomorphize(content_ty);
let layout = fx.layout_of(content_ty);
let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
- let llalign = fx
- .bcx
- .ins()
- .iconst(usize_type, layout.align.abi.bytes() as i64);
+ let llalign = fx.bcx.ins().iconst(usize_type, layout.align.abi.bytes() as i64);
let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
// Allocate space:
- let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
- Ok(id) => id,
- Err(s) => {
- fx.tcx
- .sess
- .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
- }
- };
+ let def_id =
+ match fx.tcx.lang_items().require(rustc_hir::LangItem::ExchangeMalloc) {
+ Ok(id) => id,
+ Err(s) => {
+ fx.tcx
+ .sess
+ .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
+ }
+ };
let instance = ty::Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx);
let func_ref = fx.get_function_ref(instance);
let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
lval.write_cvalue(fx, CValue::by_val(ptr, box_layout));
}
Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
- assert!(lval
- .layout()
- .ty
- .is_sized(fx.tcx.at(stmt.source_info.span), ParamEnv::reveal_all()));
+ assert!(
+ lval.layout()
+ .ty
+ .is_sized(fx.tcx.at(stmt.source_info.span), ParamEnv::reveal_all())
+ );
let ty_size = fx.layout_of(fx.monomorphize(ty)).size.bytes();
- let val = CValue::const_val(fx, fx.layout_of(fx.tcx.types.usize), ty_size.into());
+ let val =
+ 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),
},
}
}
| StatementKind::AscribeUserType(..) => {}
StatementKind::LlvmInlineAsm(asm) => {
- use rustc_span::symbol::Symbol;
- let LlvmInlineAsm {
- asm,
- outputs,
- inputs,
- } = &**asm;
- let rustc_hir::LlvmInlineAsmInner {
- asm: asm_code, // Name
- outputs: output_names, // Vec<LlvmInlineAsmOutput>
- inputs: input_names, // Vec<Name>
- clobbers, // Vec<Name>
- volatile, // bool
- alignstack, // bool
- dialect: _,
- asm_str_style: _,
- } = asm;
- match asm_code.as_str().trim() {
+ match asm.asm.asm.as_str().trim() {
"" => {
// Black box
}
- "mov %rbx, %rsi\n cpuid\n xchg %rbx, %rsi" => {
- assert_eq!(input_names, &[Symbol::intern("{eax}"), Symbol::intern("{ecx}")]);
- assert_eq!(output_names.len(), 4);
- for (i, c) in (&["={eax}", "={esi}", "={ecx}", "={edx}"]).iter().enumerate() {
- assert_eq!(&output_names[i].constraint.as_str(), c);
- assert!(!output_names[i].is_rw);
- assert!(!output_names[i].is_indirect);
- }
-
- assert_eq!(clobbers, &[]);
-
- assert!(!volatile);
- 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 (eax, ebx, ecx, edx) = crate::intrinsics::codegen_cpuid_call(fx, leaf, subleaf);
-
- assert_eq!(outputs.len(), 4);
- trans_place(fx, outputs[0]).write_cvalue(fx, CValue::by_val(eax, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[1]).write_cvalue(fx, CValue::by_val(ebx, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[2]).write_cvalue(fx, CValue::by_val(ecx, fx.layout_of(fx.tcx.types.u32)));
- trans_place(fx, outputs[3]).write_cvalue(fx, CValue::by_val(edx, fx.layout_of(fx.tcx.types.u32)));
- }
- "xgetbv" => {
- assert_eq!(input_names, &[Symbol::intern("{ecx}")]);
-
- assert_eq!(output_names.len(), 2);
- for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() {
- assert_eq!(&output_names[i].constraint.as_str(), c);
- assert!(!output_names[i].is_rw);
- assert!(!output_names[i].is_indirect);
- }
-
- assert_eq!(clobbers, &[]);
-
- assert!(!volatile);
- assert!(!alignstack);
-
- crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported");
- }
- // ___chkstk, ___chkstk_ms and __alloca are only used on Windows
- _ if fx.tcx.symbol_name(fx.instance).name.starts_with("___chkstk") => {
- crate::trap::trap_unimplemented(fx, "Stack probes are not supported");
- }
- _ if fx.tcx.symbol_name(fx.instance).name == "__alloca" => {
- crate::trap::trap_unimplemented(fx, "Alloca is not supported");
- }
- // Used in sys::windows::abort_internal
- "int $$0x29" => {
- crate::trap::trap_unimplemented(fx, "Windows abort");
- }
- _ => fx.tcx.sess.span_fatal(stmt.source_info.span, "Inline assembly is not supported"),
+ _ => fx.tcx.sess.span_fatal(
+ stmt.source_info.span,
+ "Legacy `llvm_asm!` inline assembly is not supported. \
+ Try using the new `asm!` instead.",
+ ),
}
}
StatementKind::Coverage { .. } => fx.tcx.sess.fatal("-Zcoverage is unimplemented"),
+ StatementKind::CopyNonOverlapping(inner) => {
+ let dst = codegen_operand(fx, &inner.dst);
+ let pointee = dst
+ .layout()
+ .pointee_info_at(fx, rustc_target::abi::Size::ZERO)
+ .expect("Expected pointer");
+ let dst = dst.load_scalar(fx);
+ let src = codegen_operand(fx, &inner.src).load_scalar(fx);
+ let count = codegen_operand(fx, &inner.count).load_scalar(fx);
+ let elem_size: u64 = pointee.size.bytes();
+ let bytes =
+ if elem_size != 1 { fx.bcx.ins().imul_imm(count, elem_size as i64) } else { count };
+ fx.bcx.call_memcpy(fx.module.target_config(), dst, src, bytes);
+ }
}
}
-fn codegen_array_len<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- place: CPlace<'tcx>,
-) -> Value {
- match place.layout().ty.kind {
+fn codegen_array_len<'tcx>(fx: &mut FunctionCx<'_, '_, 'tcx>, 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())
- .eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
+ let len = fx.monomorphize(len).eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
fx.bcx.ins().iconst(fx.pointer_type, len)
}
- ty::Slice(_elem_ty) => place
- .to_ptr_maybe_unsized()
- .1
- .expect("Length metadata for slice place"),
+ ty::Slice(_elem_ty) => {
+ place.to_ptr_maybe_unsized().1.expect("Length metadata for slice place")
+ }
_ => bug!("Rvalue::Len({:?})", place),
}
}
-pub(crate) fn trans_place<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_place<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
place: Place<'tcx>,
) -> CPlace<'tcx> {
let mut cplace = fx.get_local_place(place.local);
let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
cplace = cplace.place_index(fx, index);
}
- PlaceElem::ConstantIndex {
- offset,
- min_length: _,
- from_end,
- } => {
+ PlaceElem::ConstantIndex { offset, min_length: _, from_end } => {
+ let offset: u64 = offset;
let index = if !from_end {
- fx.bcx.ins().iconst(fx.pointer_type, i64::from(offset))
+ fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
} else {
let len = codegen_array_len(fx, cplace);
- fx.bcx.ins().iadd_imm(len, -i64::from(offset))
+ fx.bcx.ins().iadd_imm(len, -(offset as i64))
};
cplace = cplace.place_index(fx, index);
}
// These indices are generated by slice patterns.
// slice[from:-to] in Python terms.
- match cplace.layout().ty.kind {
+ let from: u64 = from;
+ let to: u64 = to;
+
+ match cplace.layout().ty.kind() {
ty::Array(elem_ty, _len) => {
assert!(!from_end, "array subslices are never `from_end`");
let elem_layout = fx.layout_of(elem_ty);
let ptr = cplace.to_ptr();
cplace = CPlace::for_ptr(
- ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * i64::from(from)),
- fx.layout_of(fx.tcx.mk_array(elem_ty, u64::from(to) - u64::from(from))),
+ ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)),
+ fx.layout_of(fx.tcx.mk_array(elem_ty, to - from)),
);
}
ty::Slice(elem_ty) => {
let (ptr, len) = cplace.to_ptr_maybe_unsized();
let len = len.unwrap();
cplace = CPlace::for_ptr_with_extra(
- ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * i64::from(from)),
- fx.bcx.ins().iadd_imm(len, -(i64::from(from) + i64::from(to))),
+ ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)),
+ fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
cplace.layout(),
);
}
cplace
}
-pub(crate) fn trans_operand<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_operand<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
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>, 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>,
+ 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");
+}