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https://github.com/rust-lang/rust.git
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1074 lines
43 KiB
Rust
1074 lines
43 KiB
Rust
//! Codegen of a single function
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use cranelift_codegen::ir::UserFuncName;
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use cranelift_codegen::CodegenError;
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use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
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use cranelift_module::ModuleError;
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use rustc_ast::InlineAsmOptions;
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use rustc_index::IndexVec;
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use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
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use rustc_middle::ty::adjustment::PointerCoercion;
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use rustc_middle::ty::layout::FnAbiOf;
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::TypeVisitableExt;
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use rustc_monomorphize::is_call_from_compiler_builtins_to_upstream_monomorphization;
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use crate::constant::ConstantCx;
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use crate::debuginfo::{FunctionDebugContext, TypeDebugContext};
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use crate::inline_asm::codegen_naked_asm;
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use crate::prelude::*;
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use crate::pretty_clif::CommentWriter;
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pub(crate) struct CodegenedFunction {
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symbol_name: String,
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func_id: FuncId,
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func: Function,
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clif_comments: CommentWriter,
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func_debug_cx: Option<FunctionDebugContext>,
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}
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pub(crate) fn codegen_fn<'tcx>(
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tcx: TyCtxt<'tcx>,
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cx: &mut crate::CodegenCx,
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type_dbg: &mut TypeDebugContext<'tcx>,
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cached_func: Function,
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module: &mut dyn Module,
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instance: Instance<'tcx>,
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) -> Option<CodegenedFunction> {
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debug_assert!(!instance.args.has_infer());
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let symbol_name = tcx.symbol_name(instance).name.to_string();
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let _timer = tcx.prof.generic_activity_with_arg("codegen fn", &*symbol_name);
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let mir = tcx.instance_mir(instance.def);
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let _mir_guard = crate::PrintOnPanic(|| {
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let mut buf = Vec::new();
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with_no_trimmed_paths!({
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rustc_middle::mir::pretty::write_mir_fn(tcx, mir, &mut |_, _| Ok(()), &mut buf)
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.unwrap();
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});
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String::from_utf8_lossy(&buf).into_owned()
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});
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if tcx.codegen_fn_attrs(instance.def_id()).flags.contains(CodegenFnAttrFlags::NAKED) {
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assert_eq!(mir.basic_blocks.len(), 1);
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assert!(mir.basic_blocks[START_BLOCK].statements.is_empty());
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match &mir.basic_blocks[START_BLOCK].terminator().kind {
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TerminatorKind::InlineAsm {
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template,
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operands,
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options,
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line_spans: _,
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targets: _,
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unwind: _,
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} => {
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codegen_naked_asm(
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tcx,
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cx,
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module,
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instance,
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mir.basic_blocks[START_BLOCK].terminator().source_info.span,
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&symbol_name,
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template,
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operands,
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*options,
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);
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}
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_ => unreachable!(),
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}
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return None;
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}
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// Declare function
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let sig = get_function_sig(tcx, module.target_config().default_call_conv, instance);
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let func_id = module.declare_function(&symbol_name, Linkage::Local, &sig).unwrap();
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// Make the FunctionBuilder
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let mut func_ctx = FunctionBuilderContext::new();
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let mut func = cached_func;
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func.clear();
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func.name = UserFuncName::user(0, func_id.as_u32());
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func.signature = sig;
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func.collect_debug_info();
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let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
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// Predefine blocks
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let start_block = bcx.create_block();
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let block_map: IndexVec<BasicBlock, Block> =
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(0..mir.basic_blocks.len()).map(|_| bcx.create_block()).collect();
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// Make FunctionCx
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let target_config = module.target_config();
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let pointer_type = target_config.pointer_type();
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let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
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let fn_abi = RevealAllLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty());
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let func_debug_cx = if let Some(debug_context) = &mut cx.debug_context {
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Some(debug_context.define_function(tcx, type_dbg, instance, fn_abi, &symbol_name, mir.span))
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} else {
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None
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};
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let mut fx = FunctionCx {
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cx,
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module,
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tcx,
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target_config,
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pointer_type,
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constants_cx: ConstantCx::new(),
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func_debug_cx,
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instance,
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symbol_name,
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mir,
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fn_abi,
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bcx,
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block_map,
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local_map: IndexVec::with_capacity(mir.local_decls.len()),
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caller_location: None, // set by `codegen_fn_prelude`
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clif_comments,
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next_ssa_var: 0,
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};
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tcx.prof.generic_activity("codegen clif ir").run(|| codegen_fn_body(&mut fx, start_block));
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fx.bcx.seal_all_blocks();
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fx.bcx.finalize();
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// Recover all necessary data from fx, before accessing func will prevent future access to it.
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let symbol_name = fx.symbol_name;
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let clif_comments = fx.clif_comments;
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let func_debug_cx = fx.func_debug_cx;
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fx.constants_cx.finalize(fx.tcx, &mut *fx.module);
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if cx.should_write_ir {
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crate::pretty_clif::write_clif_file(
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tcx.output_filenames(()),
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&symbol_name,
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"unopt",
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module.isa(),
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&func,
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&clif_comments,
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);
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}
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// Verify function
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verify_func(tcx, &clif_comments, &func);
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Some(CodegenedFunction { symbol_name, func_id, func, clif_comments, func_debug_cx })
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}
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pub(crate) fn compile_fn(
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cx: &mut crate::CodegenCx,
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cached_context: &mut Context,
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module: &mut dyn Module,
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codegened_func: CodegenedFunction,
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) {
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let _timer =
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cx.profiler.generic_activity_with_arg("compile function", &*codegened_func.symbol_name);
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let clif_comments = codegened_func.clif_comments;
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// Store function in context
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let context = cached_context;
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context.clear();
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context.func = codegened_func.func;
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#[cfg(any())] // This is never true
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let _clif_guard = {
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use std::fmt::Write;
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let func_clone = context.func.clone();
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let clif_comments_clone = clif_comments.clone();
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let mut clif = String::new();
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for flag in module.isa().flags().iter() {
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writeln!(clif, "set {}", flag).unwrap();
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}
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write!(clif, "target {}", module.isa().triple().architecture.to_string()).unwrap();
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for isa_flag in module.isa().isa_flags().iter() {
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write!(clif, " {}", isa_flag).unwrap();
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}
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writeln!(clif, "\n").unwrap();
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writeln!(clif, "; symbol {}", codegened_func.symbol_name).unwrap();
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crate::PrintOnPanic(move || {
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let mut clif = clif.clone();
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::cranelift_codegen::write::decorate_function(
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&mut &clif_comments_clone,
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&mut clif,
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&func_clone,
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)
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.unwrap();
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clif
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})
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};
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// Define function
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cx.profiler.generic_activity("define function").run(|| {
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context.want_disasm = cx.should_write_ir;
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match module.define_function(codegened_func.func_id, context) {
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Ok(()) => {}
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Err(ModuleError::Compilation(CodegenError::ImplLimitExceeded)) => {
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let early_dcx = rustc_session::EarlyDiagCtxt::new(
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rustc_session::config::ErrorOutputType::default(),
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);
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early_dcx.early_fatal(format!(
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"backend implementation limit exceeded while compiling {name}",
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name = codegened_func.symbol_name
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));
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}
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Err(err) => {
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panic!("Error while defining {name}: {err:?}", name = codegened_func.symbol_name);
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}
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}
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});
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if cx.should_write_ir {
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// Write optimized function to file for debugging
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crate::pretty_clif::write_clif_file(
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&cx.output_filenames,
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&codegened_func.symbol_name,
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"opt",
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module.isa(),
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&context.func,
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&clif_comments,
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);
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if let Some(disasm) = &context.compiled_code().unwrap().vcode {
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crate::pretty_clif::write_ir_file(
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&cx.output_filenames,
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&format!("{}.vcode", codegened_func.symbol_name),
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|file| file.write_all(disasm.as_bytes()),
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)
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}
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}
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// Define debuginfo for function
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let isa = module.isa();
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let debug_context = &mut cx.debug_context;
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let unwind_context = &mut cx.unwind_context;
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cx.profiler.generic_activity("generate debug info").run(|| {
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if let Some(debug_context) = debug_context {
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codegened_func.func_debug_cx.unwrap().finalize(
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debug_context,
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codegened_func.func_id,
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context,
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);
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}
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unwind_context.add_function(codegened_func.func_id, &context, isa);
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});
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}
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pub(crate) fn verify_func(
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tcx: TyCtxt<'_>,
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writer: &crate::pretty_clif::CommentWriter,
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func: &Function,
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) {
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tcx.prof.generic_activity("verify clif ir").run(|| {
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let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::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.dcx().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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Some(Box::new(writer)),
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err,
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);
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tcx.dcx().fatal(format!("cranelift verify error:\n{}", pretty_error));
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}
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}
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});
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}
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fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
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let arg_uninhabited = fx
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.mir
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.args_iter()
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.any(|arg| fx.layout_of(fx.monomorphize(fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
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if arg_uninhabited {
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fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
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fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
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fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
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return;
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}
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fx.tcx
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.prof
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.generic_activity("codegen prelude")
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.run(|| crate::abi::codegen_fn_prelude(fx, start_block));
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let reachable_blocks = traversal::mono_reachable_as_bitset(fx.mir, fx.tcx, fx.instance);
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for (bb, bb_data) in fx.mir.basic_blocks.iter_enumerated() {
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let block = fx.get_block(bb);
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fx.bcx.switch_to_block(block);
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if !reachable_blocks.contains(bb) {
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// We want to skip this block, because it's not reachable. But we still create
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// the block so terminators in other blocks can reference it.
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fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
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continue;
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}
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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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// FIXME Once unwinding is supported and Cranelift supports marking blocks as cold, do
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// so for cleanup blocks.
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}
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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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codegen_stmt(fx, block, stmt);
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}
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if fx.clif_comments.enabled() {
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let mut terminator_head = "\n".to_string();
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with_no_trimmed_paths!({
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bb_data.terminator().kind.fmt_head(&mut terminator_head).unwrap();
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});
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let inst = fx.bcx.func.layout.last_inst(block).unwrap();
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fx.add_comment(inst, terminator_head);
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}
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let source_info = bb_data.terminator().source_info;
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fx.set_debug_loc(source_info);
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let _print_guard =
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crate::PrintOnPanic(|| format!("terminator {:?}", bb_data.terminator().kind));
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match &bb_data.terminator().kind {
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TerminatorKind::Goto { target } => {
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if let TerminatorKind::Return = fx.mir[*target].terminator().kind {
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let mut can_immediately_return = true;
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for stmt in &fx.mir[*target].statements {
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if let StatementKind::StorageDead(_) = stmt.kind {
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} else {
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// FIXME Can sometimes happen, see rust-lang/rust#70531
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can_immediately_return = false;
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break;
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}
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}
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if can_immediately_return {
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crate::abi::codegen_return(fx);
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continue;
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}
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}
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let block = fx.get_block(*target);
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fx.bcx.ins().jump(block, &[]);
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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 { cond, expected, msg, target, unwind: _ } => {
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if !fx.tcx.sess.overflow_checks() && msg.is_optional_overflow_check() {
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let target = fx.get_block(*target);
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fx.bcx.ins().jump(target, &[]);
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continue;
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}
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let cond = codegen_operand(fx, cond).load_scalar(fx);
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let target = fx.get_block(*target);
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let failure = fx.bcx.create_block();
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fx.bcx.set_cold_block(failure);
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if *expected {
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fx.bcx.ins().brif(cond, target, &[], failure, &[]);
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} else {
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fx.bcx.ins().brif(cond, failure, &[], target, &[]);
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};
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fx.bcx.switch_to_block(failure);
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fx.bcx.ins().nop();
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match &**msg {
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AssertKind::BoundsCheck { ref len, ref index } => {
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let len = codegen_operand(fx, len).load_scalar(fx);
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let index = codegen_operand(fx, index).load_scalar(fx);
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let location = fx.get_caller_location(source_info).load_scalar(fx);
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codegen_panic_inner(
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fx,
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rustc_hir::LangItem::PanicBoundsCheck,
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&[index, len, location],
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Some(source_info.span),
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);
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}
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AssertKind::MisalignedPointerDereference { ref required, ref found } => {
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let required = codegen_operand(fx, required).load_scalar(fx);
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let found = codegen_operand(fx, found).load_scalar(fx);
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let location = fx.get_caller_location(source_info).load_scalar(fx);
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codegen_panic_inner(
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fx,
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rustc_hir::LangItem::PanicMisalignedPointerDereference,
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&[required, found, location],
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Some(source_info.span),
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);
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}
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_ => {
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let location = fx.get_caller_location(source_info).load_scalar(fx);
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codegen_panic_inner(
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fx,
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msg.panic_function(),
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&[location],
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Some(source_info.span),
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);
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}
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}
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}
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TerminatorKind::SwitchInt { discr, targets } => {
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let discr = codegen_operand(fx, discr);
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let switch_ty = discr.layout().ty;
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let discr = discr.load_scalar(fx);
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let use_bool_opt = switch_ty.kind() == fx.tcx.types.bool.kind()
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|| (targets.iter().count() == 1 && targets.iter().next().unwrap().0 == 0);
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if use_bool_opt {
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assert_eq!(targets.iter().count(), 1);
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let (then_value, then_block) = targets.iter().next().unwrap();
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let then_block = fx.get_block(then_block);
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let else_block = fx.get_block(targets.otherwise());
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let test_zero = match then_value {
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0 => true,
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1 => false,
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_ => unreachable!("{:?}", targets),
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};
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let (discr, is_inverted) =
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crate::optimize::peephole::maybe_unwrap_bool_not(&mut fx.bcx, discr);
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let test_zero = if is_inverted { !test_zero } else { test_zero };
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if let Some(taken) = crate::optimize::peephole::maybe_known_branch_taken(
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&fx.bcx, discr, test_zero,
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) {
|
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if taken {
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fx.bcx.ins().jump(then_block, &[]);
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} else {
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fx.bcx.ins().jump(else_block, &[]);
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}
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} else {
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if test_zero {
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fx.bcx.ins().brif(discr, else_block, &[], then_block, &[]);
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} else {
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fx.bcx.ins().brif(discr, then_block, &[], else_block, &[]);
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}
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}
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} else {
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let mut switch = ::cranelift_frontend::Switch::new();
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for (value, block) in targets.iter() {
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let block = fx.get_block(block);
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switch.set_entry(value, block);
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}
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let otherwise_block = fx.get_block(targets.otherwise());
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switch.emit(&mut fx.bcx, discr, otherwise_block);
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}
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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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target,
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fn_span,
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unwind: _,
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call_source: _,
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} => {
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fx.tcx.prof.generic_activity("codegen call").run(|| {
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crate::abi::codegen_terminator_call(
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fx,
|
|
mir::SourceInfo { span: *fn_span, ..source_info },
|
|
func,
|
|
args,
|
|
*destination,
|
|
*target,
|
|
)
|
|
});
|
|
}
|
|
TerminatorKind::InlineAsm {
|
|
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::UnreachableCodeReached);
|
|
}
|
|
TerminatorKind::Unreachable => {
|
|
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
|
|
}
|
|
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);
|
|
|
|
let target_block = fx.get_block(*target);
|
|
fx.bcx.ins().jump(target_block, &[]);
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
fn codegen_stmt<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
#[allow(unused_variables)] cur_block: Block,
|
|
stmt: &Statement<'tcx>,
|
|
) {
|
|
let _print_guard = crate::PrintOnPanic(|| format!("stmt {:?}", stmt));
|
|
|
|
fx.set_debug_loc(stmt.source_info);
|
|
|
|
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::AddressOf(_, 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 = crate::num::codegen_binop(fx, bin_op, lhs, rhs);
|
|
lval.write_cvalue(fx, res);
|
|
}
|
|
Rvalue::CheckedBinaryOp(bin_op, ref lhs_rhs) => {
|
|
let lhs = codegen_operand(fx, &lhs_rhs.0);
|
|
let rhs = codegen_operand(fx, &lhs_rhs.1);
|
|
|
|
let res = crate::num::codegen_checked_int_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 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(res, layout)
|
|
}
|
|
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(_) => 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::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,
|
|
ParamEnv::reveal_all(),
|
|
def_id,
|
|
args,
|
|
)
|
|
.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::PointerCoercion(PointerCoercion::UnsafeFnPointer),
|
|
ref operand,
|
|
to_ty,
|
|
)
|
|
| Rvalue::Cast(
|
|
CastKind::PointerCoercion(PointerCoercion::MutToConstPointer),
|
|
ref operand,
|
|
to_ty,
|
|
)
|
|
| Rvalue::Cast(
|
|
CastKind::PointerCoercion(PointerCoercion::ArrayToPointer),
|
|
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::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_fat_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_fat_ptr(fx, from_ty) {
|
|
if is_fat_ptr(fx, to_ty) {
|
|
// fat-ptr -> fat-ptr
|
|
lval.write_cvalue(fx, operand.cast_pointer_to(dest_layout));
|
|
} else {
|
|
// fat-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,
|
|
)
|
|
.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::PointerCoercion(PointerCoercion::Unsize),
|
|
ref operand,
|
|
_to_ty,
|
|
) => {
|
|
let operand = codegen_operand(fx, operand);
|
|
crate::unsize::coerce_unsized_into(fx, operand, lval);
|
|
}
|
|
Rvalue::Cast(CastKind::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).eval_target_usize(fx.tcx, ParamEnv::reveal_all());
|
|
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, ParamEnv::reveal_all()));
|
|
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) => {
|
|
layout.offset_of_subfield(fx, 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::AscribeUserType(..) => {}
|
|
|
|
StatementKind::Coverage { .. } => fx.tcx.dcx().fatal("-Zcoverage is unimplemented"),
|
|
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_target::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).eval_target_usize(fx.tcx, ParamEnv::reveal_all()) 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) => {
|
|
let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
|
|
cplace = cplace.place_index(fx, index);
|
|
}
|
|
PlaceElem::ConstantIndex { offset, min_length: _, from_end } => {
|
|
let offset: u64 = offset;
|
|
let index = if !from_end {
|
|
fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
|
|
} else {
|
|
let len = codegen_array_len(fx, cplace);
|
|
fx.bcx.ins().iadd_imm(len, -(offset as i64))
|
|
};
|
|
cplace = cplace.place_index(fx, index);
|
|
}
|
|
PlaceElem::Subslice { from, to, from_end } => {
|
|
// These indices are generated by slice patterns.
|
|
// slice[from:-to] in Python terms.
|
|
|
|
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(Ty::new_array(fx.tcx, *elem_ty, to - from)),
|
|
);
|
|
}
|
|
ty::Slice(elem_ty) => {
|
|
assert!(from_end, "slice subslices should be `from_end`");
|
|
let elem_layout = fx.layout_of(*elem_ty);
|
|
let (ptr, len) = cplace.to_ptr_unsized();
|
|
cplace = CPlace::for_ptr_with_extra(
|
|
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(),
|
|
);
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
PlaceElem::Downcast(_adt_def, variant) => {
|
|
cplace = cplace.downcast_variant(fx, variant);
|
|
}
|
|
}
|
|
}
|
|
|
|
cplace
|
|
}
|
|
|
|
pub(crate) fn codegen_operand<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
operand: &Operand<'tcx>,
|
|
) -> CValue<'tcx> {
|
|
match operand {
|
|
Operand::Move(place) | Operand::Copy(place) => {
|
|
let cplace = codegen_place(fx, *place);
|
|
cplace.to_cvalue(fx)
|
|
}
|
|
Operand::Constant(const_) => crate::constant::codegen_constant_operand(fx, const_),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn codegen_panic_nounwind<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
msg_str: &str,
|
|
span: Option<Span>,
|
|
) {
|
|
let msg_ptr = fx.anonymous_str(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];
|
|
|
|
codegen_panic_inner(fx, rustc_hir::LangItem::PanicNounwind, &args, span);
|
|
}
|
|
|
|
pub(crate) fn codegen_unwind_terminate<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
source_info: mir::SourceInfo,
|
|
reason: UnwindTerminateReason,
|
|
) {
|
|
let args = [];
|
|
|
|
codegen_panic_inner(fx, reason.lang_item(), &args, Some(source_info.span));
|
|
}
|
|
|
|
fn codegen_panic_inner<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
lang_item: rustc_hir::LangItem,
|
|
args: &[Value],
|
|
span: Option<Span>,
|
|
) {
|
|
let def_id = fx.tcx.require_lang_item(lang_item, span);
|
|
|
|
let instance = Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx);
|
|
|
|
if is_call_from_compiler_builtins_to_upstream_monomorphization(fx.tcx, instance) {
|
|
fx.bcx.ins().trap(TrapCode::User(0));
|
|
return;
|
|
}
|
|
|
|
let symbol_name = fx.tcx.symbol_name(instance).name;
|
|
|
|
fx.lib_call(
|
|
symbol_name,
|
|
args.iter().map(|&arg| AbiParam::new(fx.bcx.func.dfg.value_type(arg))).collect(),
|
|
vec![],
|
|
args,
|
|
);
|
|
|
|
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
|
|
}
|