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base.rs
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//! Codegen of a single function
use cranelift_codegen::CodegenError;
use cranelift_codegen::ir::UserFuncName;
use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
use cranelift_module::ModuleError;
use rustc_ast::InlineAsmOptions;
use rustc_codegen_ssa::base::is_call_from_compiler_builtins_to_upstream_monomorphization;
use rustc_data_structures::profiling::SelfProfilerRef;
use rustc_index::IndexVec;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::mir::InlineAsmMacro;
use rustc_middle::ty::TypeVisitableExt;
use rustc_middle::ty::adjustment::PointerCoercion;
use rustc_middle::ty::layout::{FnAbiOf, HasTypingEnv};
use rustc_middle::ty::print::with_no_trimmed_paths;
use crate::constant::ConstantCx;
use crate::debuginfo::{FunctionDebugContext, TypeDebugContext};
use crate::enable_verifier;
use crate::inline_asm::codegen_naked_asm;
use crate::prelude::*;
use crate::pretty_clif::CommentWriter;
pub(crate) struct CodegenedFunction {
symbol_name: String,
func_id: FuncId,
func: Function,
clif_comments: CommentWriter,
func_debug_cx: Option<FunctionDebugContext>,
}
pub(crate) fn codegen_fn<'tcx>(
tcx: TyCtxt<'tcx>,
cx: &mut crate::CodegenCx,
type_dbg: &mut TypeDebugContext<'tcx>,
cached_func: Function,
module: &mut dyn Module,
instance: Instance<'tcx>,
) -> Option<CodegenedFunction> {
debug_assert!(!instance.args.has_infer());
let symbol_name = tcx.symbol_name(instance).name.to_string();
let _timer = tcx.prof.generic_activity_with_arg("codegen fn", &*symbol_name);
let mir = tcx.instance_mir(instance.def);
let _mir_guard = crate::PrintOnPanic(|| {
let mut buf = Vec::new();
with_no_trimmed_paths!({
use rustc_middle::mir::pretty;
let options = pretty::PrettyPrintMirOptions::from_cli(tcx);
pretty::write_mir_fn(tcx, mir, &mut |_, _| Ok(()), &mut buf, options).unwrap();
});
String::from_utf8_lossy(&buf).into_owned()
});
if tcx.codegen_fn_attrs(instance.def_id()).flags.contains(CodegenFnAttrFlags::NAKED) {
assert_eq!(mir.basic_blocks.len(), 1);
assert!(mir.basic_blocks[START_BLOCK].statements.is_empty());
match &mir.basic_blocks[START_BLOCK].terminator().kind {
TerminatorKind::InlineAsm {
asm_macro: InlineAsmMacro::NakedAsm,
template,
operands,
options,
line_spans: _,
targets: _,
unwind: _,
} => {
codegen_naked_asm(
tcx,
cx,
module,
instance,
mir.basic_blocks[START_BLOCK].terminator().source_info.span,
&symbol_name,
template,
operands,
*options,
);
}
_ => unreachable!(),
}
return None;
}
// Declare function
let sig = get_function_sig(tcx, module.target_config().default_call_conv, instance);
let func_id = module.declare_function(&symbol_name, Linkage::Local, &sig).unwrap();
// Make the FunctionBuilder
let mut func_ctx = FunctionBuilderContext::new();
let mut func = cached_func;
func.clear();
func.name = UserFuncName::user(0, func_id.as_u32());
func.signature = sig;
func.collect_debug_info();
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 fn_abi = FullyMonomorphizedLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty());
// Make FunctionCx
let target_config = module.target_config();
let pointer_type = target_config.pointer_type();
let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance, fn_abi);
let func_debug_cx = if let Some(debug_context) = &mut cx.debug_context {
Some(debug_context.define_function(tcx, type_dbg, instance, fn_abi, &symbol_name, mir.span))
} else {
None
};
let mut fx = FunctionCx {
cx,
module,
tcx,
target_config,
pointer_type,
constants_cx: ConstantCx::new(),
func_debug_cx,
instance,
symbol_name,
mir,
fn_abi,
bcx,
block_map,
local_map: IndexVec::with_capacity(mir.local_decls.len()),
caller_location: None, // set by `codegen_fn_prelude`
clif_comments,
next_ssa_var: 0,
};
tcx.prof.generic_activity("codegen clif ir").run(|| codegen_fn_body(&mut fx, start_block));
fx.bcx.seal_all_blocks();
fx.bcx.finalize();
// Recover all necessary data from fx, before accessing func will prevent future access to it.
let symbol_name = fx.symbol_name;
let clif_comments = fx.clif_comments;
let func_debug_cx = fx.func_debug_cx;
fx.constants_cx.finalize(fx.tcx, &mut *fx.module);
if cx.should_write_ir {
crate::pretty_clif::write_clif_file(
tcx.output_filenames(()),
&symbol_name,
"unopt",
module.isa(),
&func,
&clif_comments,
);
}
// Verify function
verify_func(tcx, &clif_comments, &func);
Some(CodegenedFunction { symbol_name, func_id, func, clif_comments, func_debug_cx })
}
pub(crate) fn compile_fn(
cx: &mut crate::CodegenCx,
profiler: &SelfProfilerRef,
cached_context: &mut Context,
module: &mut dyn Module,
codegened_func: CodegenedFunction,
) {
let _timer =
profiler.generic_activity_with_arg("compile function", &*codegened_func.symbol_name);
let clif_comments = codegened_func.clif_comments;
// Store function in context
let context = cached_context;
context.clear();
context.func = codegened_func.func;
#[cfg(any())] // This is never true
let _clif_guard = {
use std::fmt::Write;
let func_clone = context.func.clone();
let clif_comments_clone = clif_comments.clone();
let mut clif = String::new();
for flag in module.isa().flags().iter() {
writeln!(clif, "set {}", flag).unwrap();
}
write!(clif, "target {}", module.isa().triple().architecture.to_string()).unwrap();
for isa_flag in module.isa().isa_flags().iter() {
write!(clif, " {}", isa_flag).unwrap();
}
writeln!(clif, "\n").unwrap();
writeln!(clif, "; symbol {}", codegened_func.symbol_name).unwrap();
crate::PrintOnPanic(move || {
let mut clif = clif.clone();
::cranelift_codegen::write::decorate_function(
&mut &clif_comments_clone,
&mut clif,
&func_clone,
)
.unwrap();
clif
})
};
// Define function
profiler.generic_activity("define function").run(|| {
context.want_disasm = cx.should_write_ir;
match module.define_function(codegened_func.func_id, context) {
Ok(()) => {}
Err(ModuleError::Compilation(CodegenError::ImplLimitExceeded)) => {
let early_dcx = rustc_session::EarlyDiagCtxt::new(
rustc_session::config::ErrorOutputType::default(),
);
early_dcx.early_fatal(format!(
"backend implementation limit exceeded while compiling {name}",
name = codegened_func.symbol_name
));
}
Err(err) => {
panic!("Error while defining {name}: {err:?}", name = codegened_func.symbol_name);
}
}
});
if cx.should_write_ir {
// Write optimized function to file for debugging
crate::pretty_clif::write_clif_file(
&cx.output_filenames,
&codegened_func.symbol_name,
"opt",
module.isa(),
&context.func,
&clif_comments,
);
if let Some(disasm) = &context.compiled_code().unwrap().vcode {
crate::pretty_clif::write_ir_file(
&cx.output_filenames,
&format!("{}.vcode", codegened_func.symbol_name),
|file| file.write_all(disasm.as_bytes()),
)
}
}
// Define debuginfo for function
let debug_context = &mut cx.debug_context;
profiler.generic_activity("generate debug info").run(|| {
if let Some(debug_context) = debug_context {
codegened_func.func_debug_cx.unwrap().finalize(
debug_context,
codegened_func.func_id,
context,
);
}
});
}
fn verify_func(tcx: TyCtxt<'_>, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
if !enable_verifier(tcx.sess) {
return;
}
tcx.prof.generic_activity("verify clif ir").run(|| {
let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::settings::builder());
match cranelift_codegen::verify_function(&func, &flags) {
Ok(_) => {}
Err(err) => {
tcx.dcx().err(format!("{:?}", err));
let pretty_error = cranelift_codegen::print_errors::pretty_verifier_error(
&func,
Some(Box::new(writer)),
err,
);
tcx.dcx().fatal(format!("cranelift verify error:\n{}", pretty_error));
}
}
});
}
fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
let arg_uninhabited = fx
.mir
.args_iter()
.any(|arg| fx.layout_of(fx.monomorphize(fx.mir.local_decls[arg].ty)).is_uninhabited());
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]);
fx.bcx.ins().trap(TrapCode::user(1 /* unreachable */).unwrap());
return;
}
fx.tcx
.prof
.generic_activity("codegen prelude")
.run(|| crate::abi::codegen_fn_prelude(fx, start_block));
let reachable_blocks = traversal::mono_reachable_as_bitset(fx.mir, fx.tcx, fx.instance);
for (bb, bb_data) in fx.mir.basic_blocks.iter_enumerated() {
let block = fx.get_block(bb);
fx.bcx.switch_to_block(block);
if !reachable_blocks.contains(bb) {
// We want to skip this block, because it's not reachable. But we still create
// the block so terminators in other blocks can reference it.
fx.bcx.ins().trap(TrapCode::user(1 /* unreachable */).unwrap());
continue;
}
if bb_data.is_cleanup {
// Unwinding after panicking is not supported
continue;
// 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);
codegen_stmt(fx, block, stmt);
}
if fx.clif_comments.enabled() {
let mut terminator_head = "\n".to_string();
with_no_trimmed_paths!({
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);
}
let source_info = bb_data.terminator().source_info;
fx.set_debug_loc(source_info);
let _print_guard =
crate::PrintOnPanic(|| format!("terminator {:?}", bb_data.terminator().kind));
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, &[]);
}
TerminatorKind::Return => {
crate::abi::codegen_return(fx);
}
TerminatorKind::Assert { cond, expected, msg, target, unwind: _ } => {
if !fx.tcx.sess.overflow_checks() && msg.is_optional_overflow_check() {
let target = fx.get_block(*target);
fx.bcx.ins().jump(target, &[]);
continue;
}
let cond = codegen_operand(fx, cond).load_scalar(fx);
let target = fx.get_block(*target);
let failure = fx.bcx.create_block();
if *expected {
fx.bcx.ins().brif(cond, target, &[], failure, &[]);
} else {
fx.bcx.ins().brif(cond, failure, &[], target, &[]);
};
fx.bcx.switch_to_block(failure);
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(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicBoundsCheck,
&[index, len, location],
Some(source_info.span),
);
}
AssertKind::MisalignedPointerDereference { ref required, ref found } => {
let required = codegen_operand(fx, required).load_scalar(fx);
let found = codegen_operand(fx, found).load_scalar(fx);
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicMisalignedPointerDereference,
&[required, found, location],
Some(source_info.span),
);
}
AssertKind::NullPointerDereference => {
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicNullPointerDereference,
&[location],
Some(source_info.span),
)
}
_ => {
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
msg.panic_function(),
&[location],
Some(source_info.span),
);
}
}
}
TerminatorKind::SwitchInt { discr, targets } => {
let discr = codegen_operand(fx, discr);
let switch_ty = discr.layout().ty;
let discr = 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, is_inverted) =
crate::optimize::peephole::maybe_unwrap_bool_not(&mut fx.bcx, discr);
let test_zero = if is_inverted { !test_zero } else { test_zero };
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().brif(discr, else_block, &[], then_block, &[]);
} else {
fx.bcx.ins().brif(discr, then_block, &[], 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);
}
}
TerminatorKind::Call {
func,
args,
destination,
target,
fn_span,
unwind: _,
call_source: _,
} => {
fx.tcx.prof.generic_activity("codegen call").run(|| {
crate::abi::codegen_terminator_call(
fx,
mir::SourceInfo { span: *fn_span, ..source_info },
func,
args,
*destination,
*target,
)
});
}
// FIXME(explicit_tail_calls): add support for tail calls to the cranelift backend, once cranelift supports tail calls
TerminatorKind::TailCall { fn_span, .. } => span_bug!(
*fn_span,
"tail calls are not yet supported in `rustc_codegen_cranelift` backend"
),
TerminatorKind::InlineAsm {
asm_macro: _,
template,
operands,
options,
targets,
line_spans: _,
unwind: _,
} => {
if options.contains(InlineAsmOptions::MAY_UNWIND) {
fx.tcx.dcx().span_fatal(
source_info.span,
"cranelift doesn't support unwinding from inline assembly.",
);
}
let have_labels = if options.contains(InlineAsmOptions::NORETURN) {
!targets.is_empty()
} else {
targets.len() > 1
};
if have_labels {
fx.tcx.dcx().span_fatal(
source_info.span,
"cranelift doesn't support labels in inline assembly.",
);
}
crate::inline_asm::codegen_inline_asm_terminator(
fx,
source_info.span,
template,
operands,
*options,
targets.get(0).copied(),
);
}
TerminatorKind::UnwindTerminate(reason) => {
codegen_unwind_terminate(fx, source_info, *reason);
}
TerminatorKind::UnwindResume => {
// FIXME implement unwinding
fx.bcx.ins().trap(TrapCode::user(1 /* unreachable */).unwrap());
}
TerminatorKind::Unreachable => {
fx.bcx.set_cold_block(block);
fx.bcx.ins().trap(TrapCode::user(1 /* unreachable */).unwrap());
}
TerminatorKind::Yield { .. }
| TerminatorKind::FalseEdge { .. }
| TerminatorKind::FalseUnwind { .. }
| TerminatorKind::CoroutineDrop => {
bug!("shouldn't exist at codegen {:?}", bb_data.terminator());
}
TerminatorKind::Drop { place, target, unwind: _, replace: _ } => {
let drop_place = codegen_place(fx, *place);
crate::abi::codegen_drop(fx, source_info, drop_place, *target);
}
};
}
}
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);
match &stmt.kind {
StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
_ => {
if fx.clif_comments.enabled() {
let inst = fx.bcx.func.layout.last_inst(cur_block).unwrap();
with_no_trimmed_paths!({
fx.add_comment(inst, format!("{:?}", stmt));
});
}
}
}
match &stmt.kind {
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 = codegen_place(fx, to_place_and_rval.0);
let dest_layout = lval.layout();
match to_place_and_rval.1 {
Rvalue::Use(ref operand) => {
let val = codegen_operand(fx, operand);
lval.write_cvalue(fx, val);
}
Rvalue::CopyForDeref(place) => {
let cplace = codegen_place(fx, place);
let val = cplace.to_cvalue(fx);
lval.write_cvalue(fx, val)
}
Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, 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());
lval.write_cvalue(fx, val);
}
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 = if let Some(bin_op) = bin_op.overflowing_to_wrapping() {
crate::num::codegen_checked_int_binop(fx, bin_op, lhs, rhs)
} else {
crate::num::codegen_binop(fx, bin_op, lhs, rhs)
};
lval.write_cvalue(fx, res);
}
Rvalue::UnaryOp(un_op, ref operand) => {
let operand = codegen_operand(fx, operand);
let layout = operand.layout();
let res = match un_op {
UnOp::Not => {
let val = operand.load_scalar(fx);
match layout.ty.kind() {
ty::Bool => {
let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
CValue::by_val(res, layout)
}
ty::Uint(_) | ty::Int(_) => {
CValue::by_val(fx.bcx.ins().bnot(val), layout)
}
_ => unreachable!("un op Not for {:?}", layout.ty),
}
}
UnOp::Neg => {
let val = operand.load_scalar(fx);
match layout.ty.kind() {
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),
}
}
UnOp::PtrMetadata => match layout.backend_repr {
BackendRepr::Scalar(_) => CValue::zst(dest_layout),
BackendRepr::ScalarPair(_, _) => {
CValue::by_val(operand.load_scalar_pair(fx).1, dest_layout)
}
_ => bug!("Unexpected `PtrToMetadata` operand: {operand:?}"),
},
};
lval.write_cvalue(fx, res);
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::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, args) => {
let func_ref = fx.get_function_ref(
Instance::resolve_for_fn_ptr(
fx.tcx,
ty::TypingEnv::fully_monomorphized(),
def_id,
args,
)
.unwrap(),
);
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::PointerCoercion(PointerCoercion::UnsafeFnPointer, _),
ref operand,
to_ty,
) => {
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
let operand = codegen_operand(fx, operand);
lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
}
Rvalue::Cast(
CastKind::PointerCoercion(
PointerCoercion::MutToConstPointer | PointerCoercion::ArrayToPointer,
_,
),
..,
) => {
bug!(
"{:?} is for borrowck, and should never appear in codegen",
to_place_and_rval.1
);
}
Rvalue::Cast(
CastKind::IntToInt
| CastKind::FloatToFloat
| CastKind::FloatToInt
| CastKind::IntToFloat
| CastKind::FnPtrToPtr
| CastKind::PtrToPtr
| CastKind::PointerExposeProvenance
| CastKind::PointerWithExposedProvenance,
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_wide_ptr<'tcx>(fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
ty.builtin_deref(true)
.is_some_and(|pointee_ty| has_ptr_meta(fx.tcx, pointee_ty))
}
if is_wide_ptr(fx, from_ty) {
if is_wide_ptr(fx, to_ty) {
// wide-ptr -> wide-ptr
lval.write_cvalue(fx, operand.cast_pointer_to(dest_layout));
} else {
// wide-ptr -> thin-ptr
let (ptr, _extra) = operand.load_scalar_pair(fx);
lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
}
} else {
let to_clif_ty = fx.clif_type(to_ty).unwrap();
let from = operand.load_scalar(fx);
let res = clif_int_or_float_cast(
fx,
from,
type_sign(from_ty),
to_clif_ty,
type_sign(to_ty),
);
lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
}
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::ClosureFnPointer(_), _),
ref operand,
_to_ty,
) => {
let operand = codegen_operand(fx, operand);
match *operand.layout().ty.kind() {
ty::Closure(def_id, args) => {
let instance = Instance::resolve_closure(
fx.tcx,
def_id,
args,
ty::ClosureKind::FnOnce,
);
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::PointerCoercion(PointerCoercion::Unsize, _),
ref operand,
_to_ty,
) => {
let operand = codegen_operand(fx, operand);
crate::unsize::coerce_unsized_into(fx, operand, lval);
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::DynStar, _),
ref operand,
_,
) => {
let operand = codegen_operand(fx, operand);
crate::unsize::coerce_dyn_star(fx, operand, lval);
}
Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
let operand = codegen_operand(fx, operand);
lval.write_cvalue_transmute(fx, operand);
}
Rvalue::Discriminant(place) => {
let place = codegen_place(fx, place);
let value = place.to_cvalue(fx);
crate::discriminant::codegen_get_discriminant(fx, lval, value, dest_layout);
}
Rvalue::Repeat(ref operand, times) => {
let operand = codegen_operand(fx, operand);
let times = fx
.monomorphize(times)
.try_to_target_usize(fx.tcx)
.expect("expected monomorphic const in codegen");
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.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().brif(done, done_block, &[], 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 = 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::ShallowInitBox(ref operand, content_ty) => {
let content_ty = fx.monomorphize(content_ty);
let box_layout = fx.layout_of(Ty::new_box(fx.tcx, content_ty));
let operand = codegen_operand(fx, operand);
let operand = operand.load_scalar(fx);
lval.write_cvalue(fx, CValue::by_val(operand, box_layout));
}
Rvalue::NullaryOp(ref null_op, ty) => {
assert!(lval.layout().ty.is_sized(fx.tcx, fx.typing_env()));
let layout = fx.layout_of(fx.monomorphize(ty));
let val = match null_op {
NullOp::SizeOf => layout.size.bytes(),
NullOp::AlignOf => layout.align.abi.bytes(),
NullOp::OffsetOf(fields) => fx
.tcx
.offset_of_subfield(
ty::TypingEnv::fully_monomorphized(),
layout,
fields.iter(),
)
.bytes(),
NullOp::UbChecks => {
let val = fx.tcx.sess.ub_checks();
let val = CValue::by_val(
fx.bcx.ins().iconst(types::I8, i64::try_from(val).unwrap()),
fx.layout_of(fx.tcx.types.bool),
);
lval.write_cvalue(fx, val);
return;
}
};
let val = CValue::by_val(
fx.bcx.ins().iconst(fx.pointer_type, i64::try_from(val).unwrap()),
fx.layout_of(fx.tcx.types.usize),
);
lval.write_cvalue(fx, val);
}
Rvalue::Aggregate(ref kind, ref operands)
if matches!(**kind, AggregateKind::RawPtr(..)) =>
{
let ty = to_place_and_rval.1.ty(&fx.mir.local_decls, fx.tcx);
let layout = fx.layout_of(fx.monomorphize(ty));
let [data, meta] = &*operands.raw else {
bug!("RawPtr fields: {operands:?}");
};
let data = codegen_operand(fx, data);
let meta = codegen_operand(fx, meta);
assert!(data.layout().ty.is_unsafe_ptr());
assert!(layout.ty.is_unsafe_ptr());
let ptr_val = if meta.layout().is_zst() {
data.cast_pointer_to(layout)
} else {
CValue::by_val_pair(data.load_scalar(fx), meta.load_scalar(fx), layout)
};
lval.write_cvalue(fx, ptr_val);
}
Rvalue::Aggregate(ref kind, ref operands) => {
let (variant_index, variant_dest, active_field_index) = match **kind {
mir::AggregateKind::Adt(_, variant_index, _, _, active_field_index) => {
let variant_dest = lval.downcast_variant(fx, variant_index);
(variant_index, variant_dest, active_field_index)
}
_ => (FIRST_VARIANT, lval, None),
};
if active_field_index.is_some() {
assert_eq!(operands.len(), 1);
}
for (i, operand) in operands.iter_enumerated() {
let operand = codegen_operand(fx, operand);
let field_index = active_field_index.unwrap_or(i);
let to = if let mir::AggregateKind::Array(_) = **kind {
let array_index = i64::from(field_index.as_u32());
let index = fx.bcx.ins().iconst(fx.pointer_type, array_index);
variant_dest.place_index(fx, index)
} else {
variant_dest.place_field(fx, field_index)
};
to.write_cvalue(fx, operand);
}
crate::discriminant::codegen_set_discriminant(fx, lval, variant_index);
}
}
}
StatementKind::StorageLive(_)
| StatementKind::StorageDead(_)
| StatementKind::Deinit(_)
| StatementKind::ConstEvalCounter
| StatementKind::Nop
| StatementKind::FakeRead(..)
| StatementKind::Retag { .. }
| StatementKind::PlaceMention(..)
| StatementKind::BackwardIncompatibleDropHint { .. }
| StatementKind::AscribeUserType(..) => {}
StatementKind::Coverage { .. } => unreachable!(),
StatementKind::Intrinsic(ref intrinsic) => match &**intrinsic {
// We ignore `assume` intrinsics, they are only useful for optimizations
NonDivergingIntrinsic::Assume(_) => {}
NonDivergingIntrinsic::CopyNonOverlapping(mir::CopyNonOverlapping {
src,
dst,
count,
}) => {
let dst = codegen_operand(fx, dst);
let pointee = dst
.layout()
.pointee_info_at(fx, rustc_abi::Size::ZERO)
.expect("Expected pointer");
let dst = dst.load_scalar(fx);
let src = codegen_operand(fx, src).load_scalar(fx);
let count = codegen_operand(fx, 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.target_config, dst, src, bytes);
}
},
}
}
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)
.try_to_target_usize(fx.tcx)
.expect("expected monomorphic const in codegen") as i64;
fx.bcx.ins().iconst(fx.pointer_type, len)
}
ty::Slice(_elem_ty) => place.to_ptr_unsized().1,
_ => bug!("Rvalue::Len({:?})", place),
}
}
pub(crate) fn codegen_place<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
place: Place<'tcx>,
) -> CPlace<'tcx> {
let mut cplace = fx.get_local_place(place.local);
for elem in place.projection {
match elem {
PlaceElem::Deref => {
cplace = cplace.place_deref(fx);
}
PlaceElem::OpaqueCast(ty) => bug!("encountered OpaqueCast({ty}) in codegen"),
PlaceElem::Subtype(ty) => cplace = cplace.place_transmute_type(fx, fx.monomorphize(ty)),
PlaceElem::Field(field, _ty) => {
cplace = cplace.place_field(fx, field);
}
PlaceElem::Index(local) => {