-use rustc_middle::ty::adjustment::PointerCast;
+//! 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<'clif, 'tcx, B: Backend + 'static>(
- cx: &mut crate::CodegenCx<'clif, '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 mir = *tcx.instance_mir(instance.def);
+ 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();
- 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;
- context.clear();
- context.func.name = ExternalName::user(0, func_id.as_u32());
- context.func.signature = sig;
- context.func.collect_debug_info();
+ cx.cached_context.clear();
+
+ // Make the FunctionBuilder
let mut func_ctx = FunctionBuilderContext::new();
- let mut bcx = FunctionBuilder::new(&mut context.func, &mut func_ctx);
+ let mut func = std::mem::replace(&mut cx.cached_context.func, Function::new());
+ func.name = ExternalName::user(0, func_id.as_u32());
+ func.signature = sig;
+ func.collect_debug_info();
- // Predefine block's
+ let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
+
+ // 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 clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
let mut fx = FunctionCx {
+ cx,
tcx,
- module: cx.module,
pointer_type,
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(),
clif_comments,
- constants_cx: &mut cx.constants_cx,
- vtables: &mut cx.vtables,
source_info_set: indexmap::IndexSet::new(),
+ next_ssa_var: 0,
+
+ 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 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");
+ 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 {
- fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
+ 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);
+ // 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);
// 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,
+ &cold_blocks,
+ &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.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;
- 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 cranelift_codegen::binemit::NullTrapSink {},
+ )
+ .unwrap()
+ });
// 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(
+ tcx,
+ "opt",
+ Some(cx.module.isa()),
+ instance,
+ &context,
+ &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;
+ 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
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 = 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)),
});
}
-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() {
let block = fx.get_block(bb);
fx.bcx.switch_to_block(block);
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)]
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;
}
}
- 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);
- trap_panic(
- fx,
- format!(
- "[panic] Assert {:?} at {:?} failed.",
- msg,
- bb_data.terminator().source_info.span
- ),
- );
+ fx.bcx.ins().nop();
+
+ match msg {
+ AssertKind::BoundsCheck { ref len, ref index } => {
+ 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();
+ codegen_panic(fx, msg_str, bb_data.terminator().source_info.span);
+ }
+ }
}
TerminatorKind::SwitchInt {
discr,
- switch_ty: _,
- values,
+ switch_ty,
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 as u64, block);
+ 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,
args,
destination,
+ fn_span,
cleanup: _,
from_hir_call: _,
} => {
- fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
+ fx.tcx.sess.time("codegen call", || {
+ crate::abi::codegen_terminator_call(
+ fx,
+ *fn_span,
+ block,
+ func,
+ args,
+ *destination,
+ )
+ });
+ }
+ TerminatorKind::InlineAsm {
+ template,
+ operands,
+ options,
+ destination,
+ line_spans: _,
+ } => {
+ crate::inline_asm::codegen_inline_asm(
fx,
bb_data.terminator().source_info.span,
- func,
- args,
- *destination,
- ));
+ template,
+ operands,
+ *options,
+ );
+
+ match *destination {
+ Some(destination) => {
+ let destination_block = fx.get_block(destination);
+ fx.bcx.ins().jump(destination_block, &[]);
+ }
+ None => {
+ crate::trap::trap_unreachable(
+ fx,
+ "[corruption] Returned from noreturn inline asm",
+ );
+ }
+ }
}
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());
+ bug!("shouldn't exist at codegen {:?}", bb_data.terminator());
}
TerminatorKind::Drop {
- location,
+ place,
target,
unwind: _,
} => {
- let drop_place = trans_place(fx, *location);
+ 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, impl Module>,
+ #[allow(unused_variables)] 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);
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);
- place.write_place_ref(fx, lval);
+ 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());
+ 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::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(),
+ 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>,
+ fx: &FunctionCx<'_, 'tcx, impl Module>,
ty: Ty<'tcx>,
) -> bool {
ty.builtin_deref(true)
|ty::TypeAndMut {
ty: pointee_ty,
mutbl: _,
- }| has_ptr_meta(fx.tcx, pointee_ty),
+ }| {
+ 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 discr = crate::discriminant::codegen_get_discriminant(
- fx,
- operand,
- fx.layout_of(to_ty),
- );
- lval.write_cvalue(fx, discr);
+ use rustc_target::abi::{Int, TagEncoding, 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() {
+ 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 {
+ ref 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!(),
+ }
} 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);
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 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.cx.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 box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
// Allocate space:
- let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
+ let def_id = match fx
+ .tcx
+ .lang_items()
+ .require(rustc_hir::LangItem::ExchangeMalloc)
+ {
Ok(id) => id,
Err(s) => {
fx.tcx
.fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
}
};
- let instance = ty::Instance::mono(fx.tcx, def_id);
+ 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]);
let ptr = fx.bcx.inst_results(call)[0];
.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_ast::ast::Name;
+ use rustc_span::symbol::Symbol;
let LlvmInlineAsm {
asm,
- outputs: _,
- inputs: _,
+ outputs,
+ inputs,
} = &**asm;
let rustc_hir::LlvmInlineAsmInner {
- asm: asm_code, // Name
- outputs, // Vec<Name>
- inputs, // Vec<Name>
- clobbers, // Vec<Name>
- volatile, // bool
- alignstack, // bool
- dialect: _, // rustc_ast::ast::AsmDialect
+ 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() {
+ match asm_code.as_str().trim() {
"" => {
- 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}"])
+ "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!(&outputs[i].constraint.as_str(), c);
- assert!(!outputs[i].is_rw);
- assert!(!outputs[i].is_indirect);
+ assert_eq!(&output_names[i].constraint.as_str(), c);
+ assert!(!output_names[i].is_rw);
+ assert!(!output_names[i].is_indirect);
}
- assert_eq!(clobbers, &[Name::intern("rbx")]);
+ assert_eq!(clobbers, &[]);
assert!(!volatile);
assert!(!alignstack);
- crate::trap::trap_unimplemented(
- fx,
- "__cpuid_count arch intrinsic is not supported",
- );
+ assert_eq!(inputs.len(), 2);
+ 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);
+ codegen_place(fx, outputs[0])
+ .write_cvalue(fx, CValue::by_val(eax, fx.layout_of(fx.tcx.types.u32)));
+ codegen_place(fx, outputs[1])
+ .write_cvalue(fx, CValue::by_val(ebx, fx.layout_of(fx.tcx.types.u32)));
+ codegen_place(fx, outputs[2])
+ .write_cvalue(fx, CValue::by_val(ecx, fx.layout_of(fx.tcx.types.u32)));
+ codegen_place(fx, outputs[3])
+ .write_cvalue(fx, CValue::by_val(edx, fx.layout_of(fx.tcx.types.u32)));
}
"xgetbv" => {
- assert_eq!(inputs, &[Name::intern("{ecx}")]);
+ assert_eq!(input_names, &[Symbol::intern("{ecx}")]);
- assert_eq!(outputs.len(), 2);
+ assert_eq!(output_names.len(), 2);
for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() {
- assert_eq!(&outputs[i].constraint.as_str(), c);
- assert!(!outputs[i].is_rw);
- assert!(!outputs[i].is_indirect);
+ assert_eq!(&output_names[i].constraint.as_str(), c);
+ assert!(!output_names[i].is_rw);
+ assert!(!output_names[i].is_indirect);
}
assert_eq!(clobbers, &[]);
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
+ .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"),
}
}
+ StatementKind::Coverage { .. } => fx.tcx.sess.fatal("-Zcoverage is unimplemented"),
}
}
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 {
+ match *place.layout().ty.kind() {
ty::Array(_elem_ty, len) => {
- let len = fx.monomorphize(&len)
- .eval(fx.tcx, ParamEnv::reveal_all())
+ let len = fx
+ .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);
for elem in place.projection {
- match *elem {
+ match elem {
PlaceElem::Deref => {
cplace = cplace.place_deref(fx);
}
min_length: _,
from_end,
} => {
+ let offset: u64 = offset;
let index = if !from_end {
fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
} else {
// 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 * from as i64),
- fx.layout_of(fx.tcx.mk_array(elem_ty, to as u64 - from as u64)),
+ 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 * from as i64),
+ 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, 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