use crate::prelude::*;
-pub(crate) fn trans_fn<'clif, 'tcx, B: Backend + 'static>(
- cx: &mut crate::CodegenCx<'clif, 'tcx, B>,
+pub(crate) fn trans_fn<'tcx, B: Backend + 'static>(
+ cx: &mut crate::CodegenCx<'tcx, B>,
instance: Instance<'tcx>,
linkage: Linkage,
) {
let tcx = cx.tcx;
- let mir = *tcx.instance_mir(instance.def);
+ 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 mut debug_context = cx
- .debug_context
- .as_mut()
- .map(|debug_context| FunctionDebugContext::new(debug_context, instance, func_id, &name));
// Make FunctionBuilder
let context = &mut cx.cached_context;
let mut func_ctx = FunctionBuilderContext::new();
let mut bcx = FunctionBuilder::new(&mut context.func, &mut func_ctx);
- // Predefine block's
+ // 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 mut fx = FunctionCx {
tcx,
- module: cx.module,
+ module: &mut cx.module,
pointer_type,
instance,
bcx,
block_map,
- local_map: HashMap::new(),
+ local_map: FxHashMap::with_capacity_and_hasher(mir.local_decls.len(), Default::default()),
caller_location: None, // set by `codegen_fn_prelude`
cold_blocks: EntitySet::new(),
};
let arg_uninhabited = fx.mir.args_iter().any(|arg| fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
- let is_call_once_for_box = name.starts_with("_ZN83_$LT$alloc..boxed..Box$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once");
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 if is_call_once_for_box {
- // HACK implement `<Box<F> as FnOnce>::call_once` without `alloca`.
- tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, false));
- fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
- let bb_data = &fx.mir.basic_blocks()[START_BLOCK];
- let destination = match &bb_data.terminator().kind {
- TerminatorKind::Call {
- func,
- args,
- destination,
- cleanup: _,
- from_hir_call: _,
- } => {
- assert_eq!(args.len(), 2);
-
- let closure_arg = Local::new(1);
- let closure_local = args[0].place().unwrap().as_local().unwrap();
- assert_eq!(fx.mir.local_decls[closure_local].ty, fx.mir.local_decls[closure_arg].ty.builtin_deref(true).unwrap().ty);
- let closure_deref = fx.local_map[&closure_arg].place_deref(&mut fx);
- fx.local_map.insert(closure_local, closure_deref);
-
- let args_arg = Local::new(2);
- let args_local = args[1].place().unwrap().as_local().unwrap();
- assert_eq!(fx.mir.local_decls[args_local].ty, fx.mir.local_decls[args_arg].ty);
- fx.local_map.insert(args_local, fx.local_map[&args_arg]);
-
- fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
- &mut fx,
- bb_data.terminator().source_info.span,
- func,
- args,
- *destination,
- ));
- destination.map(|(_ret_place, ret_block)| ret_block)
- }
- _ => unreachable!(),
- };
-
- let destination = if let Some(destination) = destination {
- fx.bcx.switch_to_block(fx.block_map[destination]);
- let bb_data = &fx.mir.basic_blocks()[destination];
- match &bb_data.terminator().kind {
- TerminatorKind::Call {
- func,
- args,
- destination,
- cleanup: _,
- from_hir_call: _,
- } => {
- match destination {
- Some((ret_place, _ret_block)) => {
- fx.local_map.insert(ret_place.as_local().unwrap(), CPlace::no_place(fx.layout_of(fx.tcx.mk_unit())));
- }
- None => {}
- }
-
- assert_eq!(args.len(), 1);
- fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
- &mut fx,
- bb_data.terminator().source_info.span,
- func,
- args,
- *destination,
- ));
- destination.map(|(_ret_place, ret_block)| ret_block)
- }
- _ => unreachable!(),
- }
- } else {
- None
- };
-
- if let Some(destination) = destination {
- fx.bcx.switch_to_block(fx.block_map[destination]);
- let bb_data = &fx.mir.basic_blocks()[destination];
- match &bb_data.terminator().kind {
- TerminatorKind::Return => crate::abi::codegen_return(&mut fx),
- _ => unreachable!(),
- }
- }
} else {
tcx.sess.time("codegen clif ir", || {
- tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, true));
+ tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block));
codegen_fn_content(&mut fx);
});
}
let local_map = fx.local_map;
let cold_blocks = fx.cold_blocks;
- #[cfg(debug_assertions)]
- crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &context.func, &clif_comments, None);
+ crate::pretty_clif::write_clif_file(
+ cx.tcx,
+ "unopt",
+ None,
+ instance,
+ &context,
+ &clif_comments,
+ );
// Verify function
verify_func(tcx, &clif_comments, &context.func);
crate::optimize::optimize_function(tcx, instance, context, &cold_blocks, &mut clif_comments);
});
+ // If the return block is not reachable, then the SSA builder may have inserted a `iconst.i128`
+ // instruction, which doesn't have an encoding.
+ context.compute_cfg();
+ context.compute_domtree();
+ context.eliminate_unreachable_code(cx.module.isa()).unwrap();
+
// Define function
let module = &mut cx.module;
tcx.sess.time(
);
// Write optimized function to file for debugging
- #[cfg(debug_assertions)]
- {
- let value_ranges = context
- .build_value_labels_ranges(cx.module.isa())
- .expect("value location ranges");
-
- crate::pretty_clif::write_clif_file(
- cx.tcx,
- "opt",
- instance,
- &context.func,
- &clif_comments,
- Some(&value_ranges),
- );
- }
+ crate::pretty_clif::write_clif_file(
+ cx.tcx,
+ "opt",
+ Some(cx.module.isa()),
+ instance,
+ &context,
+ &clif_comments,
+ );
// Define debuginfo for function
let isa = cx.module.isa();
+ let debug_context = &mut cx.debug_context;
+ let unwind_context = &mut cx.unwind_context;
tcx.sess.time("generate debug info", || {
- debug_context
- .as_mut()
- .map(|x| x.define(context, isa, &source_info_set, local_map));
+ if let Some(debug_context) = debug_context {
+ debug_context.define_function(instance, func_id, &name, isa, context, &source_info_set, local_map);
+ }
+ unwind_context.add_function(func_id, &context, isa);
});
// Clear context to make it usable for the next function
pub(crate) fn verify_func(tcx: TyCtxt<'_>, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
tcx.sess.time("verify clif ir", || {
- let flags = settings::Flags::new(settings::builder());
- match ::cranelift_codegen::verify_function(&func, &flags) {
+ let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::settings::builder());
+ match cranelift_codegen::verify_function(&func, &flags) {
Ok(_) => {}
Err(err) => {
tcx.sess.err(&format!("{:?}", err));
- let pretty_error = ::cranelift_codegen::print_errors::pretty_verifier_error(
+ let pretty_error = cranelift_codegen::print_errors::pretty_verifier_error(
&func,
None,
Some(Box::new(writer)),
match &bb_data.terminator().kind {
TerminatorKind::Goto { target } => {
+ if let TerminatorKind::Return = fx.mir[*target].terminator().kind {
+ let mut can_immediately_return = true;
+ for stmt in &fx.mir[*target].statements {
+ if let StatementKind::StorageDead(_) = stmt.kind {
+ } else {
+ // FIXME Can sometimes happen, see rust-lang/rust#70531
+ can_immediately_return = false;
+ break;
+ }
+ }
+
+ if can_immediately_return {
+ crate::abi::codegen_return(fx);
+ continue;
+ }
+ }
+
let block = fx.get_block(*target);
fx.bcx.ins().jump(block, &[]);
}
cleanup: _,
} => {
if !fx.tcx.sess.overflow_checks() {
- if let mir::AssertKind::OverflowNeg = *msg {
+ if let mir::AssertKind::OverflowNeg(_) = *msg {
let target = fx.get_block(*target);
fx.bcx.ins().jump(target, &[]);
continue;
fx.bcx.ins().jump(target, &[]);
fx.bcx.switch_to_block(failure);
- trap_panic(
- fx,
- format!(
- "[panic] Assert {:?} at {:?} failed.",
- msg,
- bb_data.terminator().source_info.span
- ),
- );
+
+ let location = fx.get_caller_location(bb_data.terminator().source_info.span).load_scalar(fx);
+
+ let args;
+ let lang_item = 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 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
+ }
+ };
+
+ 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);
+ let symbol_name = fx.tcx.symbol_name(instance).name.as_str();
+
+ 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 {
func,
args,
destination,
+ fn_span,
cleanup: _,
from_hir_call: _,
} => {
fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
fx,
- bb_data.terminator().source_info.span,
+ *fn_span,
+ block,
func,
args,
*destination,
));
}
+ TerminatorKind::InlineAsm {
+ template,
+ operands,
+ options: _,
+ destination,
+ line_spans: _,
+ } => {
+ match template {
+ &[] => {
+ assert_eq!(operands, &[]);
+ match *destination {
+ Some(destination) => {
+ let destination_block = fx.get_block(destination);
+ fx.bcx.ins().jump(destination_block, &[]);
+ }
+ None => bug!(),
+ }
+
+ // Black box
+ }
+ _ => fx.tcx.sess.span_fatal(bb_data.terminator().source_info.span, "Inline assembly is not supported"),
+ }
+ }
TerminatorKind::Resume | TerminatorKind::Abort => {
trap_unreachable(fx, "[corruption] Unwinding bb reached.");
}
trap_unreachable(fx, "[corruption] Hit unreachable code.");
}
TerminatorKind::Yield { .. }
- | TerminatorKind::FalseEdges { .. }
+ | TerminatorKind::FalseEdge { .. }
| TerminatorKind::FalseUnwind { .. }
| TerminatorKind::DropAndReplace { .. }
| TerminatorKind::GeneratorDrop => {
bug!("shouldn't exist at trans {:?}", bb_data.terminator());
}
TerminatorKind::Drop {
- location,
+ place,
target,
unwind: _,
} => {
- let drop_place = trans_place(fx, *location);
+ let drop_place = trans_place(fx, *place);
crate::abi::codegen_drop(fx, bb_data.terminator().source_info.span, drop_place);
let target_block = fx.get_block(*target);
cur_block: Block,
stmt: &Statement<'tcx>,
) {
- let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
+ let _print_guard = crate::PrintOnPanic(|| format!("stmt {:?}", stmt));
fx.set_debug_loc(stmt.source_info);
let place = trans_place(fx, *place);
place.write_place_ref(fx, lval);
}
+ Rvalue::ThreadLocalRef(def_id) => {
+ 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::Cast(CastKind::Pointer(PointerCast::ArrayToPointer), operand, to_ty) => {
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
let operand = trans_operand(fx, operand);
- lval.write_cvalue(fx, operand.unchecked_cast_to(to_layout));
+ lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
}
Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
let operand = trans_operand(fx, operand);
if is_fat_ptr(fx, from_ty) {
if is_fat_ptr(fx, to_ty) {
// fat-ptr -> fat-ptr
- lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
+ lval.write_cvalue(fx, operand.cast_pointer_to(dest_layout));
} else {
// fat-ptr -> thin-ptr
let (ptr, _extra) = operand.load_scalar_pair(fx);
| StatementKind::AscribeUserType(..) => {}
StatementKind::LlvmInlineAsm(asm) => {
- use rustc_ast::ast::Name;
+ use rustc_span::symbol::Symbol;
let LlvmInlineAsm {
asm,
outputs: _,
asm_str_style: _,
} = asm;
match &*asm_code.as_str() {
- "" => {
- assert_eq!(inputs, &[Name::intern("r")]);
- assert!(outputs.is_empty(), "{:?}", outputs);
-
- // Black box
- }
- "cpuid" | "cpuid\n" => {
- assert_eq!(inputs, &[Name::intern("{eax}"), Name::intern("{ecx}")]);
-
- assert_eq!(outputs.len(), 4);
- for (i, c) in (&["={eax}", "={ebx}", "={ecx}", "={edx}"])
- .iter()
- .enumerate()
- {
- assert_eq!(&outputs[i].constraint.as_str(), c);
- assert!(!outputs[i].is_rw);
- assert!(!outputs[i].is_indirect);
- }
-
- assert_eq!(clobbers, &[Name::intern("rbx")]);
-
- assert!(!volatile);
- assert!(!alignstack);
-
+ cpuid if cpuid.contains("cpuid") => {
crate::trap::trap_unimplemented(
fx,
"__cpuid_count arch intrinsic is not supported",
);
}
"xgetbv" => {
- assert_eq!(inputs, &[Name::intern("{ecx}")]);
+ assert_eq!(inputs, &[Symbol::intern("{ecx}")]);
assert_eq!(outputs.len(), 2);
for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() {
crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported");
}
- _ => unimpl_fatal!(fx.tcx, stmt.source_info.span, "Inline assembly is not supported"),
+ // ___chkstk, ___chkstk_ms and __alloca are only used on Windows
+ _ if fx.tcx.symbol_name(fx.instance).name.as_str().starts_with("___chkstk") => {
+ crate::trap::trap_unimplemented(fx, "Stack probes are not supported");
+ }
+ _ if fx.tcx.symbol_name(fx.instance).name.as_str() == "__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.bcx.ins().iconst(fx.pointer_type, len)
}
ty::Slice(_elem_ty) => place
- .to_ptr_maybe_unsized(fx)
+ .to_ptr_maybe_unsized()
.1
.expect("Length metadata for slice place"),
_ => bug!("Rvalue::Len({:?})", place),
let mut cplace = fx.get_local_place(place.local);
for elem in place.projection {
- match *elem {
+ match elem {
PlaceElem::Deref => {
cplace = cplace.place_deref(fx);
}
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(fx);
+ 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, to as u64 - from as u64)),
ty::Slice(elem_ty) => {
assert!(from_end, "slice subslices should be `from_end`");
let elem_layout = fx.layout_of(elem_ty);
- let (ptr, len) = cplace.to_ptr_maybe_unsized(fx);
+ 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 * from as i64),