mv compiler to compiler/
This commit is contained in:
mark
Vadim Petrochenkov
parent
db534b3ac2
commit
9e5f7d5631
1686 changed files with 941 additions and 1051 deletions
563
compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
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563
compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
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@ -0,0 +1,563 @@
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// See doc.rs for documentation.
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mod doc;
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use rustc_codegen_ssa::mir::debuginfo::VariableKind::*;
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use self::metadata::{file_metadata, type_metadata, TypeMap, UNKNOWN_LINE_NUMBER};
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use self::namespace::mangled_name_of_instance;
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use self::type_names::compute_debuginfo_type_name;
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use self::utils::{create_DIArray, is_node_local_to_unit, DIB};
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use crate::abi::FnAbi;
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use crate::builder::Builder;
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use crate::common::CodegenCx;
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use crate::llvm;
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use crate::llvm::debuginfo::{
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DIArray, DIBuilder, DIFile, DIFlags, DILexicalBlock, DISPFlags, DIScope, DIType, DIVariable,
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};
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use crate::value::Value;
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use rustc_codegen_ssa::debuginfo::type_names;
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use rustc_codegen_ssa::mir::debuginfo::{DebugScope, FunctionDebugContext, VariableKind};
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use rustc_codegen_ssa::traits::*;
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use rustc_data_structures::fx::{FxHashMap, FxHashSet};
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use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LOCAL_CRATE};
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use rustc_index::vec::IndexVec;
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use rustc_middle::mir;
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use rustc_middle::ty::layout::HasTyCtxt;
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use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
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use rustc_middle::ty::{self, Instance, ParamEnv, Ty, TypeFoldable};
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use rustc_session::config::{self, DebugInfo};
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use rustc_span::symbol::Symbol;
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use rustc_span::{self, BytePos, Span};
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use rustc_target::abi::{LayoutOf, Primitive, Size};
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use libc::c_uint;
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use smallvec::SmallVec;
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use std::cell::RefCell;
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use tracing::debug;
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mod create_scope_map;
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pub mod gdb;
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pub mod metadata;
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mod namespace;
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mod source_loc;
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mod utils;
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pub use self::create_scope_map::compute_mir_scopes;
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pub use self::metadata::create_global_var_metadata;
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pub use self::metadata::extend_scope_to_file;
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#[allow(non_upper_case_globals)]
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const DW_TAG_auto_variable: c_uint = 0x100;
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#[allow(non_upper_case_globals)]
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const DW_TAG_arg_variable: c_uint = 0x101;
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/// A context object for maintaining all state needed by the debuginfo module.
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pub struct CrateDebugContext<'a, 'tcx> {
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llcontext: &'a llvm::Context,
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llmod: &'a llvm::Module,
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builder: &'a mut DIBuilder<'a>,
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created_files: RefCell<FxHashMap<(Option<String>, Option<String>), &'a DIFile>>,
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created_enum_disr_types: RefCell<FxHashMap<(DefId, Primitive), &'a DIType>>,
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type_map: RefCell<TypeMap<'a, 'tcx>>,
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namespace_map: RefCell<DefIdMap<&'a DIScope>>,
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// This collection is used to assert that composite types (structs, enums,
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// ...) have their members only set once:
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composite_types_completed: RefCell<FxHashSet<&'a DIType>>,
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}
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impl Drop for CrateDebugContext<'a, 'tcx> {
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fn drop(&mut self) {
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unsafe {
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llvm::LLVMRustDIBuilderDispose(&mut *(self.builder as *mut _));
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}
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}
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}
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impl<'a, 'tcx> CrateDebugContext<'a, 'tcx> {
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pub fn new(llmod: &'a llvm::Module) -> Self {
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debug!("CrateDebugContext::new");
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let builder = unsafe { llvm::LLVMRustDIBuilderCreate(llmod) };
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// DIBuilder inherits context from the module, so we'd better use the same one
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let llcontext = unsafe { llvm::LLVMGetModuleContext(llmod) };
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CrateDebugContext {
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llcontext,
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llmod,
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builder,
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created_files: Default::default(),
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created_enum_disr_types: Default::default(),
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type_map: Default::default(),
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namespace_map: RefCell::new(Default::default()),
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composite_types_completed: Default::default(),
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}
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}
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}
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/// Creates any deferred debug metadata nodes
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pub fn finalize(cx: &CodegenCx<'_, '_>) {
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if cx.dbg_cx.is_none() {
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return;
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}
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debug!("finalize");
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if gdb::needs_gdb_debug_scripts_section(cx) {
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// Add a .debug_gdb_scripts section to this compile-unit. This will
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// cause GDB to try and load the gdb_load_rust_pretty_printers.py file,
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// which activates the Rust pretty printers for binary this section is
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// contained in.
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gdb::get_or_insert_gdb_debug_scripts_section_global(cx);
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}
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unsafe {
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llvm::LLVMRustDIBuilderFinalize(DIB(cx));
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// Debuginfo generation in LLVM by default uses a higher
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// version of dwarf than macOS currently understands. We can
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// instruct LLVM to emit an older version of dwarf, however,
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// for macOS to understand. For more info see #11352
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// This can be overridden using --llvm-opts -dwarf-version,N.
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// Android has the same issue (#22398)
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if cx.sess().target.target.options.is_like_osx
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|| cx.sess().target.target.options.is_like_android
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{
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llvm::LLVMRustAddModuleFlag(cx.llmod, "Dwarf Version\0".as_ptr().cast(), 2)
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}
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// Indicate that we want CodeView debug information on MSVC
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if cx.sess().target.target.options.is_like_msvc {
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llvm::LLVMRustAddModuleFlag(cx.llmod, "CodeView\0".as_ptr().cast(), 1)
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}
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// Prevent bitcode readers from deleting the debug info.
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let ptr = "Debug Info Version\0".as_ptr();
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llvm::LLVMRustAddModuleFlag(cx.llmod, ptr.cast(), llvm::LLVMRustDebugMetadataVersion());
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};
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}
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impl DebugInfoBuilderMethods for Builder<'a, 'll, 'tcx> {
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// FIXME(eddyb) find a common convention for all of the debuginfo-related
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// names (choose between `dbg`, `debug`, `debuginfo`, `debug_info` etc.).
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fn dbg_var_addr(
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&mut self,
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dbg_var: &'ll DIVariable,
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scope_metadata: &'ll DIScope,
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variable_alloca: Self::Value,
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direct_offset: Size,
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indirect_offsets: &[Size],
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span: Span,
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) {
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let cx = self.cx();
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// Convert the direct and indirect offsets to address ops.
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// FIXME(eddyb) use `const`s instead of getting the values via FFI,
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// the values should match the ones in the DWARF standard anyway.
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let op_deref = || unsafe { llvm::LLVMRustDIBuilderCreateOpDeref() };
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let op_plus_uconst = || unsafe { llvm::LLVMRustDIBuilderCreateOpPlusUconst() };
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let mut addr_ops = SmallVec::<[_; 8]>::new();
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if direct_offset.bytes() > 0 {
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addr_ops.push(op_plus_uconst());
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addr_ops.push(direct_offset.bytes() as i64);
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}
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for &offset in indirect_offsets {
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addr_ops.push(op_deref());
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if offset.bytes() > 0 {
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addr_ops.push(op_plus_uconst());
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addr_ops.push(offset.bytes() as i64);
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}
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}
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// FIXME(eddyb) maybe this information could be extracted from `dbg_var`,
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// to avoid having to pass it down in both places?
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// NB: `var` doesn't seem to know about the column, so that's a limitation.
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let dbg_loc = cx.create_debug_loc(scope_metadata, span);
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unsafe {
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// FIXME(eddyb) replace `llvm.dbg.declare` with `llvm.dbg.addr`.
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llvm::LLVMRustDIBuilderInsertDeclareAtEnd(
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DIB(cx),
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variable_alloca,
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dbg_var,
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addr_ops.as_ptr(),
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addr_ops.len() as c_uint,
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dbg_loc,
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self.llbb(),
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);
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}
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}
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fn set_source_location(&mut self, scope: &'ll DIScope, span: Span) {
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debug!("set_source_location: {}", self.sess().source_map().span_to_string(span));
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let dbg_loc = self.cx().create_debug_loc(scope, span);
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unsafe {
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llvm::LLVMSetCurrentDebugLocation(self.llbuilder, dbg_loc);
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}
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}
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fn insert_reference_to_gdb_debug_scripts_section_global(&mut self) {
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gdb::insert_reference_to_gdb_debug_scripts_section_global(self)
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}
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fn set_var_name(&mut self, value: &'ll Value, name: &str) {
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// Avoid wasting time if LLVM value names aren't even enabled.
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if self.sess().fewer_names() {
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return;
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}
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// Only function parameters and instructions are local to a function,
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// don't change the name of anything else (e.g. globals).
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let param_or_inst = unsafe {
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llvm::LLVMIsAArgument(value).is_some() || llvm::LLVMIsAInstruction(value).is_some()
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};
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if !param_or_inst {
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return;
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}
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// Avoid replacing the name if it already exists.
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// While we could combine the names somehow, it'd
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// get noisy quick, and the usefulness is dubious.
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if llvm::get_value_name(value).is_empty() {
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llvm::set_value_name(value, name.as_bytes());
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}
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}
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}
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impl DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx> {
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fn create_function_debug_context(
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&self,
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instance: Instance<'tcx>,
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fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
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llfn: &'ll Value,
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mir: &mir::Body<'_>,
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) -> Option<FunctionDebugContext<&'ll DIScope>> {
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if self.sess().opts.debuginfo == DebugInfo::None {
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return None;
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}
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let span = mir.span;
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// This can be the case for functions inlined from another crate
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if span.is_dummy() {
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// FIXME(simulacrum): Probably can't happen; remove.
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return None;
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}
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let def_id = instance.def_id();
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let containing_scope = get_containing_scope(self, instance);
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let loc = self.lookup_debug_loc(span.lo());
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let file_metadata = file_metadata(self, &loc.file, def_id.krate);
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let function_type_metadata = unsafe {
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let fn_signature = get_function_signature(self, fn_abi);
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llvm::LLVMRustDIBuilderCreateSubroutineType(DIB(self), fn_signature)
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};
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// Find the enclosing function, in case this is a closure.
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let def_key = self.tcx().def_key(def_id);
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let mut name = def_key.disambiguated_data.data.to_string();
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let enclosing_fn_def_id = self.tcx().closure_base_def_id(def_id);
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// Get_template_parameters() will append a `<...>` clause to the function
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// name if necessary.
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let generics = self.tcx().generics_of(enclosing_fn_def_id);
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let substs = instance.substs.truncate_to(self.tcx(), generics);
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let template_parameters = get_template_parameters(self, &generics, substs, &mut name);
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let linkage_name = &mangled_name_of_instance(self, instance).name;
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// Omit the linkage_name if it is the same as subprogram name.
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let linkage_name = if &name == linkage_name { "" } else { linkage_name };
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// FIXME(eddyb) does this need to be separate from `loc.line` for some reason?
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let scope_line = loc.line;
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let mut flags = DIFlags::FlagPrototyped;
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if fn_abi.ret.layout.abi.is_uninhabited() {
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flags |= DIFlags::FlagNoReturn;
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}
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let mut spflags = DISPFlags::SPFlagDefinition;
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if is_node_local_to_unit(self, def_id) {
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spflags |= DISPFlags::SPFlagLocalToUnit;
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}
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if self.sess().opts.optimize != config::OptLevel::No {
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spflags |= DISPFlags::SPFlagOptimized;
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}
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if let Some((id, _)) = self.tcx.entry_fn(LOCAL_CRATE) {
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if id.to_def_id() == def_id {
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spflags |= DISPFlags::SPFlagMainSubprogram;
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}
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}
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let fn_metadata = unsafe {
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llvm::LLVMRustDIBuilderCreateFunction(
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DIB(self),
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containing_scope,
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name.as_ptr().cast(),
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name.len(),
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linkage_name.as_ptr().cast(),
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linkage_name.len(),
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file_metadata,
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loc.line.unwrap_or(UNKNOWN_LINE_NUMBER),
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function_type_metadata,
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scope_line.unwrap_or(UNKNOWN_LINE_NUMBER),
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flags,
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spflags,
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llfn,
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template_parameters,
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None,
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)
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};
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// Initialize fn debug context (including scopes).
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// FIXME(eddyb) figure out a way to not need `Option` for `scope_metadata`.
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let null_scope = DebugScope {
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scope_metadata: None,
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file_start_pos: BytePos(0),
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file_end_pos: BytePos(0),
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};
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let mut fn_debug_context = FunctionDebugContext {
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scopes: IndexVec::from_elem(null_scope, &mir.source_scopes),
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defining_crate: def_id.krate,
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};
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// Fill in all the scopes, with the information from the MIR body.
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compute_mir_scopes(self, mir, fn_metadata, &mut fn_debug_context);
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return Some(fn_debug_context);
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fn get_function_signature<'ll, 'tcx>(
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cx: &CodegenCx<'ll, 'tcx>,
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fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
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) -> &'ll DIArray {
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if cx.sess().opts.debuginfo == DebugInfo::Limited {
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return create_DIArray(DIB(cx), &[]);
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}
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let mut signature = Vec::with_capacity(fn_abi.args.len() + 1);
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// Return type -- llvm::DIBuilder wants this at index 0
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signature.push(if fn_abi.ret.is_ignore() {
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None
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} else {
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Some(type_metadata(cx, fn_abi.ret.layout.ty, rustc_span::DUMMY_SP))
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});
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// Arguments types
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if cx.sess().target.target.options.is_like_msvc {
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// FIXME(#42800):
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// There is a bug in MSDIA that leads to a crash when it encounters
|
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// a fixed-size array of `u8` or something zero-sized in a
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// function-type (see #40477).
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// As a workaround, we replace those fixed-size arrays with a
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// pointer-type. So a function `fn foo(a: u8, b: [u8; 4])` would
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// appear as `fn foo(a: u8, b: *const u8)` in debuginfo,
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// and a function `fn bar(x: [(); 7])` as `fn bar(x: *const ())`.
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// This transformed type is wrong, but these function types are
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// already inaccurate due to ABI adjustments (see #42800).
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signature.extend(fn_abi.args.iter().map(|arg| {
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let t = arg.layout.ty;
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let t = match t.kind {
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ty::Array(ct, _)
|
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if (ct == cx.tcx.types.u8) || cx.layout_of(ct).is_zst() =>
|
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{
|
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cx.tcx.mk_imm_ptr(ct)
|
||||
}
|
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_ => t,
|
||||
};
|
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Some(type_metadata(cx, t, rustc_span::DUMMY_SP))
|
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}));
|
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} else {
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signature.extend(
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fn_abi
|
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.args
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.iter()
|
||||
.map(|arg| Some(type_metadata(cx, arg.layout.ty, rustc_span::DUMMY_SP))),
|
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);
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}
|
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|
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create_DIArray(DIB(cx), &signature[..])
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}
|
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|
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fn get_template_parameters<'ll, 'tcx>(
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cx: &CodegenCx<'ll, 'tcx>,
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generics: &ty::Generics,
|
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substs: SubstsRef<'tcx>,
|
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name_to_append_suffix_to: &mut String,
|
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) -> &'ll DIArray {
|
||||
if substs.types().next().is_none() {
|
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return create_DIArray(DIB(cx), &[]);
|
||||
}
|
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|
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name_to_append_suffix_to.push('<');
|
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for (i, actual_type) in substs.types().enumerate() {
|
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if i != 0 {
|
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name_to_append_suffix_to.push_str(",");
|
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}
|
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|
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let actual_type =
|
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cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), actual_type);
|
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// Add actual type name to <...> clause of function name
|
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let actual_type_name = compute_debuginfo_type_name(cx.tcx(), actual_type, true);
|
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name_to_append_suffix_to.push_str(&actual_type_name[..]);
|
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}
|
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name_to_append_suffix_to.push('>');
|
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|
||||
// Again, only create type information if full debuginfo is enabled
|
||||
let template_params: Vec<_> = if cx.sess().opts.debuginfo == DebugInfo::Full {
|
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let names = get_parameter_names(cx, generics);
|
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substs
|
||||
.iter()
|
||||
.zip(names)
|
||||
.filter_map(|(kind, name)| {
|
||||
if let GenericArgKind::Type(ty) = kind.unpack() {
|
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let actual_type =
|
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cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), ty);
|
||||
let actual_type_metadata =
|
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type_metadata(cx, actual_type, rustc_span::DUMMY_SP);
|
||||
let name = name.as_str();
|
||||
Some(unsafe {
|
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Some(llvm::LLVMRustDIBuilderCreateTemplateTypeParameter(
|
||||
DIB(cx),
|
||||
None,
|
||||
name.as_ptr().cast(),
|
||||
name.len(),
|
||||
actual_type_metadata,
|
||||
))
|
||||
})
|
||||
} else {
|
||||
None
|
||||
}
|
||||
})
|
||||
.collect()
|
||||
} else {
|
||||
vec![]
|
||||
};
|
||||
|
||||
create_DIArray(DIB(cx), &template_params[..])
|
||||
}
|
||||
|
||||
fn get_parameter_names(cx: &CodegenCx<'_, '_>, generics: &ty::Generics) -> Vec<Symbol> {
|
||||
let mut names = generics
|
||||
.parent
|
||||
.map_or(vec![], |def_id| get_parameter_names(cx, cx.tcx.generics_of(def_id)));
|
||||
names.extend(generics.params.iter().map(|param| param.name));
|
||||
names
|
||||
}
|
||||
|
||||
fn get_containing_scope<'ll, 'tcx>(
|
||||
cx: &CodegenCx<'ll, 'tcx>,
|
||||
instance: Instance<'tcx>,
|
||||
) -> &'ll DIScope {
|
||||
// First, let's see if this is a method within an inherent impl. Because
|
||||
// if yes, we want to make the result subroutine DIE a child of the
|
||||
// subroutine's self-type.
|
||||
let self_type = cx.tcx.impl_of_method(instance.def_id()).and_then(|impl_def_id| {
|
||||
// If the method does *not* belong to a trait, proceed
|
||||
if cx.tcx.trait_id_of_impl(impl_def_id).is_none() {
|
||||
let impl_self_ty = cx.tcx.subst_and_normalize_erasing_regions(
|
||||
instance.substs,
|
||||
ty::ParamEnv::reveal_all(),
|
||||
&cx.tcx.type_of(impl_def_id),
|
||||
);
|
||||
|
||||
// Only "class" methods are generally understood by LLVM,
|
||||
// so avoid methods on other types (e.g., `<*mut T>::null`).
|
||||
match impl_self_ty.kind {
|
||||
ty::Adt(def, ..) if !def.is_box() => {
|
||||
// Again, only create type information if full debuginfo is enabled
|
||||
if cx.sess().opts.debuginfo == DebugInfo::Full
|
||||
&& !impl_self_ty.needs_subst()
|
||||
{
|
||||
Some(type_metadata(cx, impl_self_ty, rustc_span::DUMMY_SP))
|
||||
} else {
|
||||
Some(namespace::item_namespace(cx, def.did))
|
||||
}
|
||||
}
|
||||
_ => None,
|
||||
}
|
||||
} else {
|
||||
// For trait method impls we still use the "parallel namespace"
|
||||
// strategy
|
||||
None
|
||||
}
|
||||
});
|
||||
|
||||
self_type.unwrap_or_else(|| {
|
||||
namespace::item_namespace(
|
||||
cx,
|
||||
DefId {
|
||||
krate: instance.def_id().krate,
|
||||
index: cx
|
||||
.tcx
|
||||
.def_key(instance.def_id())
|
||||
.parent
|
||||
.expect("get_containing_scope: missing parent?"),
|
||||
},
|
||||
)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
fn create_vtable_metadata(&self, ty: Ty<'tcx>, vtable: Self::Value) {
|
||||
metadata::create_vtable_metadata(self, ty, vtable)
|
||||
}
|
||||
|
||||
fn extend_scope_to_file(
|
||||
&self,
|
||||
scope_metadata: &'ll DIScope,
|
||||
file: &rustc_span::SourceFile,
|
||||
defining_crate: CrateNum,
|
||||
) -> &'ll DILexicalBlock {
|
||||
metadata::extend_scope_to_file(&self, scope_metadata, file, defining_crate)
|
||||
}
|
||||
|
||||
fn debuginfo_finalize(&self) {
|
||||
finalize(self)
|
||||
}
|
||||
|
||||
// FIXME(eddyb) find a common convention for all of the debuginfo-related
|
||||
// names (choose between `dbg`, `debug`, `debuginfo`, `debug_info` etc.).
|
||||
fn create_dbg_var(
|
||||
&self,
|
||||
dbg_context: &FunctionDebugContext<&'ll DIScope>,
|
||||
variable_name: Symbol,
|
||||
variable_type: Ty<'tcx>,
|
||||
scope_metadata: &'ll DIScope,
|
||||
variable_kind: VariableKind,
|
||||
span: Span,
|
||||
) -> &'ll DIVariable {
|
||||
let loc = self.lookup_debug_loc(span.lo());
|
||||
let file_metadata = file_metadata(self, &loc.file, dbg_context.defining_crate);
|
||||
|
||||
let type_metadata = type_metadata(self, variable_type, span);
|
||||
|
||||
let (argument_index, dwarf_tag) = match variable_kind {
|
||||
ArgumentVariable(index) => (index as c_uint, DW_TAG_arg_variable),
|
||||
LocalVariable => (0, DW_TAG_auto_variable),
|
||||
};
|
||||
let align = self.align_of(variable_type);
|
||||
|
||||
let name = variable_name.as_str();
|
||||
unsafe {
|
||||
llvm::LLVMRustDIBuilderCreateVariable(
|
||||
DIB(self),
|
||||
dwarf_tag,
|
||||
scope_metadata,
|
||||
name.as_ptr().cast(),
|
||||
name.len(),
|
||||
file_metadata,
|
||||
loc.line.unwrap_or(UNKNOWN_LINE_NUMBER),
|
||||
type_metadata,
|
||||
true,
|
||||
DIFlags::FlagZero,
|
||||
argument_index,
|
||||
align.bytes() as u32,
|
||||
)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue