651 lines
26 KiB
Rust
651 lines
26 KiB
Rust
use rustc::ty::adjustment::PointerCast;
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use crate::prelude::*;
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pub fn trans_fn<'clif, 'tcx, B: Backend + 'static>(
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cx: &mut crate::CodegenCx<'clif, 'tcx, B>,
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instance: Instance<'tcx>,
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linkage: Linkage,
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) {
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let tcx = cx.tcx;
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let mir = tcx.instance_mir(instance.def);
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// Declare function
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let (name, sig) = get_function_name_and_sig(tcx, instance, false);
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let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
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let mut debug_context = cx
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.debug_context
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.as_mut()
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.map(|debug_context| FunctionDebugContext::new(tcx, debug_context, mir, &name, &sig));
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// Make FunctionBuilder
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let mut func = Function::with_name_signature(ExternalName::user(0, 0), sig);
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let mut func_ctx = FunctionBuilderContext::new();
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let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
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// Predefine ebb's
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let start_ebb = bcx.create_ebb();
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let mut ebb_map: HashMap<BasicBlock, Ebb> = HashMap::new();
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for (bb, _bb_data) in mir.basic_blocks().iter_enumerated() {
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ebb_map.insert(bb, bcx.create_ebb());
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}
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// Make FunctionCx
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let pointer_type = cx.module.target_config().pointer_type();
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let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
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let mut fx = FunctionCx {
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tcx,
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module: cx.module,
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pointer_type,
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instance,
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mir,
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bcx,
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ebb_map,
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local_map: HashMap::new(),
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clif_comments,
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constants_cx: &mut cx.constants_cx,
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caches: &mut cx.caches,
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source_info_set: indexmap::IndexSet::new(),
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};
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with_unimpl_span(fx.mir.span, || {
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crate::abi::codegen_fn_prelude(&mut fx, start_ebb);
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codegen_fn_content(&mut fx);
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});
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// Recover all necessary data from fx, before accessing func will prevent future access to it.
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let instance = fx.instance;
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let clif_comments = fx.clif_comments;
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let source_info_set = fx.source_info_set;
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#[cfg(debug_assertions)]
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crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &func, &clif_comments, None);
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// Verify function
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verify_func(tcx, &clif_comments, &func);
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// Define function
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let context = &mut cx.caches.context;
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context.func = func;
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cx.module
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.define_function(func_id, context)
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.unwrap();
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let value_ranges = context.build_value_labels_ranges(cx.module.isa()).expect("value location ranges");
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// Write optimized function to file for debugging
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#[cfg(debug_assertions)]
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crate::pretty_clif::write_clif_file(cx.tcx, "opt", instance, &context.func, &clif_comments, Some(&value_ranges));
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// Define debuginfo for function
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let isa = cx.module.isa();
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debug_context
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.as_mut()
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.map(|x| x.define(tcx, context, isa, &source_info_set));
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// Clear context to make it usable for the next function
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context.clear();
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}
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fn verify_func(tcx: TyCtxt, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
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let flags = settings::Flags::new(settings::builder());
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match ::cranelift::codegen::verify_function(&func, &flags) {
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Ok(_) => {}
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Err(err) => {
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tcx.sess.err(&format!("{:?}", err));
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let pretty_error = ::cranelift::codegen::print_errors::pretty_verifier_error(
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&func,
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None,
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Some(Box::new(writer)),
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err,
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);
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tcx.sess
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.fatal(&format!("cranelift verify error:\n{}", pretty_error));
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}
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}
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}
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fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
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for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
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if bb_data.is_cleanup {
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// Unwinding after panicking is not supported
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continue;
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}
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let ebb = fx.get_ebb(bb);
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fx.bcx.switch_to_block(ebb);
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fx.bcx.ins().nop();
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for stmt in &bb_data.statements {
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fx.set_debug_loc(stmt.source_info);
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trans_stmt(fx, ebb, stmt);
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}
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#[cfg(debug_assertions)]
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{
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let mut terminator_head = "\n".to_string();
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bb_data
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.terminator()
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.kind
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.fmt_head(&mut terminator_head)
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.unwrap();
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let inst = fx.bcx.func.layout.last_inst(ebb).unwrap();
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fx.add_comment(inst, terminator_head);
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}
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fx.set_debug_loc(bb_data.terminator().source_info);
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match &bb_data.terminator().kind {
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TerminatorKind::Goto { target } => {
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let ebb = fx.get_ebb(*target);
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fx.bcx.ins().jump(ebb, &[]);
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}
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TerminatorKind::Return => {
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crate::abi::codegen_return(fx);
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}
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TerminatorKind::Assert {
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cond,
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expected,
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msg,
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target,
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cleanup: _,
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} => {
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let cond = trans_operand(fx, cond).load_scalar(fx);
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// TODO HACK brz/brnz for i8/i16 is not yet implemented
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let cond = fx.bcx.ins().uextend(types::I32, cond);
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let target = fx.get_ebb(*target);
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if *expected {
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fx.bcx.ins().brnz(cond, target, &[]);
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} else {
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fx.bcx.ins().brz(cond, target, &[]);
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};
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trap_panic(fx, format!("[panic] Assert {:?} at {:?} failed.", msg, bb_data.terminator().source_info.span));
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}
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TerminatorKind::SwitchInt {
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discr,
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switch_ty: _,
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values,
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targets,
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} => {
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let discr = trans_operand(fx, discr).load_scalar(fx);
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let mut switch = ::cranelift::frontend::Switch::new();
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for (i, value) in values.iter().enumerate() {
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let ebb = fx.get_ebb(targets[i]);
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switch.set_entry(*value as u64, ebb);
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}
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let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
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switch.emit(&mut fx.bcx, discr, otherwise_ebb);
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}
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TerminatorKind::Call {
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func,
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args,
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destination,
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cleanup: _,
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from_hir_call: _,
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} => {
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crate::abi::codegen_terminator_call(fx, func, args, destination);
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}
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TerminatorKind::Resume | TerminatorKind::Abort => {
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trap_unreachable(fx, "[corruption] Unwinding bb reached.");
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}
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TerminatorKind::Unreachable => {
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trap_unreachable(fx, "[corruption] Hit unreachable code.");
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}
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TerminatorKind::Yield { .. }
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| TerminatorKind::FalseEdges { .. }
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| TerminatorKind::FalseUnwind { .. }
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| TerminatorKind::DropAndReplace { .. }
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| TerminatorKind::GeneratorDrop => {
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bug!("shouldn't exist at trans {:?}", bb_data.terminator());
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}
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TerminatorKind::Drop {
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location,
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target,
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unwind: _,
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} => {
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let drop_place = trans_place(fx, location);
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crate::abi::codegen_drop(fx, drop_place);
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let target_ebb = fx.get_ebb(*target);
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fx.bcx.ins().jump(target_ebb, &[]);
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}
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};
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}
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fx.bcx.seal_all_blocks();
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fx.bcx.finalize();
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}
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fn trans_stmt<'tcx>(
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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cur_ebb: Ebb,
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stmt: &Statement<'tcx>,
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) {
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let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
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fx.set_debug_loc(stmt.source_info);
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#[cfg(debug_assertions)]
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match &stmt.kind {
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StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
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_ => {
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let inst = fx.bcx.func.layout.last_inst(cur_ebb).unwrap();
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fx.add_comment(inst, format!("{:?}", stmt));
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}
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}
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match &stmt.kind {
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StatementKind::SetDiscriminant {
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place,
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variant_index,
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} => {
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let place = trans_place(fx, place);
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crate::discriminant::codegen_set_discriminant(fx, place, *variant_index);
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}
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StatementKind::Assign(to_place, rval) => {
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let lval = trans_place(fx, to_place);
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let dest_layout = lval.layout();
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match &**rval {
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Rvalue::Use(operand) => {
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let val = trans_operand(fx, operand);
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lval.write_cvalue(fx, val);
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}
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Rvalue::Ref(_, _, place) => {
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let place = trans_place(fx, place);
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place.write_place_ref(fx, lval);
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}
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Rvalue::BinaryOp(bin_op, lhs, rhs) => {
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let lhs = trans_operand(fx, lhs);
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let rhs = trans_operand(fx, rhs);
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let res = crate::num::codegen_binop(fx, *bin_op, lhs, rhs);
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lval.write_cvalue(fx, res);
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}
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Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
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let lhs = trans_operand(fx, lhs);
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let rhs = trans_operand(fx, rhs);
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let res = if !fx.tcx.sess.overflow_checks() {
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let val = crate::num::trans_int_binop(fx, *bin_op, lhs, rhs).load_scalar(fx);
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let is_overflow = fx.bcx.ins().iconst(types::I8, 0);
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CValue::by_val_pair(val, is_overflow, lval.layout())
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} else {
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crate::num::trans_checked_int_binop(fx, *bin_op, lhs, rhs)
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};
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lval.write_cvalue(fx, res);
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}
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Rvalue::UnaryOp(un_op, operand) => {
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let operand = trans_operand(fx, operand);
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let layout = operand.layout();
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let val = operand.load_scalar(fx);
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let res = match un_op {
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UnOp::Not => {
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match layout.ty.sty {
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ty::Bool => {
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let val = fx.bcx.ins().uextend(types::I32, val); // WORKAROUND for CraneStation/cranelift#466
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let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
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fx.bcx.ins().bint(types::I8, res)
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}
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ty::Uint(_) | ty::Int(_) => {
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fx.bcx.ins().bnot(val)
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}
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_ => unimplemented!("un op Not for {:?}", layout.ty),
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}
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}
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UnOp::Neg => match layout.ty.sty {
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ty::Int(_) => {
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let clif_ty = fx.clif_type(layout.ty).unwrap();
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if clif_ty == types::I128 {
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// FIXME implement it
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crate::trap::trap_unreachable_ret_value(fx, layout, "i128 neg is not yet supported").load_scalar(fx)
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} else {
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let zero = fx.bcx.ins().iconst(clif_ty, 0);
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fx.bcx.ins().isub(zero, val)
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}
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}
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ty::Float(_) => fx.bcx.ins().fneg(val),
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_ => unimplemented!("un op Neg for {:?}", layout.ty),
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},
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};
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lval.write_cvalue(fx, CValue::by_val(res, layout));
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}
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Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, ty) => {
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let layout = fx.layout_of(ty);
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match fx
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.monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx))
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.sty
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{
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ty::FnDef(def_id, substs) => {
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let func_ref = fx.get_function_ref(
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Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
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.unwrap(),
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);
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let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
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lval.write_cvalue(fx, CValue::by_val(func_addr, layout));
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}
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_ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", ty),
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}
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}
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Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, ty)
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| Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, ty) => {
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let operand = trans_operand(fx, operand);
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let layout = fx.layout_of(ty);
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lval.write_cvalue(fx, operand.unchecked_cast_to(layout));
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}
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Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
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let operand = trans_operand(fx, operand);
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let from_ty = operand.layout().ty;
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fn is_fat_ptr<'tcx>(fx: &FunctionCx<'_, 'tcx, impl Backend>, ty: Ty<'tcx>) -> bool {
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ty
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.builtin_deref(true)
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.map(|ty::TypeAndMut {ty: pointee_ty, mutbl: _ }| fx.layout_of(pointee_ty).is_unsized())
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.unwrap_or(false)
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}
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if is_fat_ptr(fx, from_ty) {
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if is_fat_ptr(fx, to_ty) {
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// fat-ptr -> fat-ptr
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lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
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} else {
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// fat-ptr -> thin-ptr
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let (ptr, _extra) = operand.load_scalar_pair(fx);
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lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
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}
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} else if let ty::Adt(adt_def, _substs) = from_ty.sty {
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// enum -> discriminant value
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assert!(adt_def.is_enum());
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match to_ty.sty {
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ty::Uint(_) | ty::Int(_) => {},
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_ => unreachable!("cast adt {} -> {}", from_ty, to_ty),
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}
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let discr = crate::discriminant::codegen_get_discriminant(fx, operand, fx.layout_of(to_ty));
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lval.write_cvalue(fx, discr);
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} else {
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let to_clif_ty = fx.clif_type(to_ty).unwrap();
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let from = operand.load_scalar(fx);
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let res = clif_int_or_float_cast(fx, from, type_sign(from_ty), to_clif_ty, type_sign(to_ty));
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lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
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}
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}
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Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _ty) => {
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let operand = trans_operand(fx, operand);
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match operand.layout().ty.sty {
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ty::Closure(def_id, substs) => {
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let instance = Instance::resolve_closure(
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fx.tcx,
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def_id,
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substs,
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ty::ClosureKind::FnOnce,
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);
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let func_ref = fx.get_function_ref(instance);
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let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
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lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
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}
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_ => {
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bug!("{} cannot be cast to a fn ptr", operand.layout().ty)
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}
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}
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}
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Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _ty) => {
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let operand = trans_operand(fx, operand);
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operand.unsize_value(fx, lval);
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}
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Rvalue::Discriminant(place) => {
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let place = trans_place(fx, place);
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let value = place.to_cvalue(fx);
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let discr = crate::discriminant::codegen_get_discriminant(fx, value, dest_layout);
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lval.write_cvalue(fx, discr);
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}
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Rvalue::Repeat(operand, times) => {
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let operand = trans_operand(fx, operand);
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for i in 0..*times {
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let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
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let to = lval.place_index(fx, index);
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to.write_cvalue(fx, operand);
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}
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}
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Rvalue::Len(place) => {
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let place = trans_place(fx, place);
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let usize_layout = fx.layout_of(fx.tcx.types.usize);
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let len = codegen_array_len(fx, place);
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lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
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}
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Rvalue::NullaryOp(NullOp::Box, content_ty) => {
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use rustc::middle::lang_items::ExchangeMallocFnLangItem;
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let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
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let layout = fx.layout_of(content_ty);
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let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
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let llalign = fx
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.bcx
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.ins()
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.iconst(usize_type, layout.align.abi.bytes() as i64);
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let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
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// Allocate space:
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let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
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Ok(id) => id,
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Err(s) => {
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fx.tcx
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.sess
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.fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
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}
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};
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let instance = ty::Instance::mono(fx.tcx, def_id);
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let func_ref = fx.get_function_ref(instance);
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let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
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let ptr = fx.bcx.inst_results(call)[0];
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lval.write_cvalue(fx, CValue::by_val(ptr, box_layout));
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}
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Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
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assert!(lval
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.layout()
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.ty
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.is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all()));
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let ty_size = fx.layout_of(ty).size.bytes();
|
|
let val = CValue::const_val(fx, fx.tcx.types.usize, ty_size.into());
|
|
lval.write_cvalue(fx, val);
|
|
}
|
|
Rvalue::Aggregate(kind, operands) => match **kind {
|
|
AggregateKind::Array(_ty) => {
|
|
for (i, operand) in operands.into_iter().enumerate() {
|
|
let operand = trans_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);
|
|
}
|
|
}
|
|
_ => unimpl!("shouldn't exist at trans {:?}", rval),
|
|
},
|
|
}
|
|
}
|
|
StatementKind::StorageLive(_)
|
|
| StatementKind::StorageDead(_)
|
|
| StatementKind::Nop
|
|
| StatementKind::FakeRead(..)
|
|
| StatementKind::Retag { .. }
|
|
| StatementKind::AscribeUserType(..) => {}
|
|
|
|
StatementKind::InlineAsm(asm) => {
|
|
use syntax::ast::Name;
|
|
let InlineAsm { asm, outputs: _, inputs: _ } = &**asm;
|
|
let rustc::hir::InlineAsm {
|
|
asm: asm_code, // Name
|
|
outputs, // Vec<Name>
|
|
inputs, // Vec<Name>
|
|
clobbers, // Vec<Name>
|
|
volatile, // bool
|
|
alignstack, // bool
|
|
dialect: _, // syntax::ast::AsmDialect
|
|
asm_str_style: _,
|
|
} = asm;
|
|
match &*asm_code.as_str() {
|
|
"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);
|
|
|
|
crate::trap::trap_unimplemented(fx, "__cpuid_count arch intrinsic is not supported");
|
|
}
|
|
"xgetbv" => {
|
|
assert_eq!(inputs, &[Name::intern("{ecx}")]);
|
|
|
|
assert_eq!(outputs.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!(clobbers, &[]);
|
|
|
|
assert!(!volatile);
|
|
assert!(!alignstack);
|
|
|
|
crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported");
|
|
}
|
|
_ if fx.tcx.symbol_name(fx.instance).as_str() == "__rust_probestack" => {
|
|
crate::trap::trap_unimplemented(fx, "__rust_probestack is not supported");
|
|
}
|
|
_ => unimpl!("Inline assembly is not supported"),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn codegen_array_len<'tcx>(
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
place: CPlace<'tcx>,
|
|
) -> Value {
|
|
match place.layout().ty.sty {
|
|
ty::Array(_elem_ty, len) => {
|
|
let len = crate::constant::force_eval_const(fx, len)
|
|
.eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
|
|
fx.bcx.ins().iconst(fx.pointer_type, len)
|
|
}
|
|
ty::Slice(_elem_ty) => place
|
|
.to_addr_maybe_unsized(fx)
|
|
.1
|
|
.expect("Length metadata for slice place"),
|
|
_ => bug!("Rvalue::Len({:?})", place),
|
|
}
|
|
}
|
|
|
|
pub fn trans_place<'tcx>(
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
place: &Place<'tcx>,
|
|
) -> CPlace<'tcx> {
|
|
let base = match &place.base {
|
|
PlaceBase::Local(local) => fx.get_local_place(*local),
|
|
PlaceBase::Static(static_) => match static_.kind {
|
|
StaticKind::Static => {
|
|
crate::constant::codegen_static_ref(fx, static_.def_id, static_.ty)
|
|
}
|
|
StaticKind::Promoted(promoted, substs) => {
|
|
let instance = Instance::new(static_.def_id, fx.monomorphize(&substs));
|
|
crate::constant::trans_promoted(fx, instance, promoted, static_.ty)
|
|
}
|
|
}
|
|
};
|
|
|
|
trans_place_projection(fx, base, &place.projection)
|
|
}
|
|
|
|
pub fn trans_place_projection<'tcx>(
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
base: CPlace<'tcx>,
|
|
projection: &Option<Box<Projection<'tcx>>>,
|
|
) -> CPlace<'tcx> {
|
|
let projection = if let Some(projection) = projection {
|
|
projection
|
|
} else {
|
|
return base;
|
|
};
|
|
|
|
let base = trans_place_projection(fx, base, &projection.base);
|
|
|
|
match projection.elem {
|
|
ProjectionElem::Deref => base.place_deref(fx),
|
|
ProjectionElem::Field(field, _ty) => base.place_field(fx, field),
|
|
ProjectionElem::Index(local) => {
|
|
let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
|
|
base.place_index(fx, index)
|
|
}
|
|
ProjectionElem::ConstantIndex {
|
|
offset,
|
|
min_length: _,
|
|
from_end,
|
|
} => {
|
|
let index = if !from_end {
|
|
fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
|
|
} else {
|
|
let len = codegen_array_len(fx, base);
|
|
fx.bcx.ins().iadd_imm(len, -(offset as i64))
|
|
};
|
|
base.place_index(fx, index)
|
|
}
|
|
ProjectionElem::Subslice { from, to } => {
|
|
// These indices are generated by slice patterns.
|
|
// slice[from:-to] in Python terms.
|
|
|
|
match base.layout().ty.sty {
|
|
ty::Array(elem_ty, len) => {
|
|
let elem_layout = fx.layout_of(elem_ty);
|
|
let ptr = base.to_addr(fx);
|
|
let len = crate::constant::force_eval_const(fx, len)
|
|
.eval_usize(fx.tcx, ParamEnv::reveal_all());
|
|
CPlace::for_addr(
|
|
fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
|
|
fx.layout_of(fx.tcx.mk_array(elem_ty, len - from as u64 - to as u64)),
|
|
)
|
|
}
|
|
ty::Slice(elem_ty) => {
|
|
let elem_layout = fx.layout_of(elem_ty);
|
|
let (ptr, len) = base.to_addr_maybe_unsized(fx);
|
|
let len = len.unwrap();
|
|
CPlace::for_addr_with_extra(
|
|
fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
|
|
fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
|
|
base.layout(),
|
|
)
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
ProjectionElem::Downcast(_adt_def, variant) => base.downcast_variant(fx, variant),
|
|
}
|
|
}
|
|
|
|
pub fn trans_operand<'tcx>(
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
operand: &Operand<'tcx>,
|
|
) -> CValue<'tcx> {
|
|
match operand {
|
|
Operand::Move(place) | Operand::Copy(place) => {
|
|
let cplace = trans_place(fx, place);
|
|
cplace.to_cvalue(fx)
|
|
}
|
|
Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),
|
|
}
|
|
}
|