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#![doc = include_str!("doc.md")]
use std::cell::{OnceCell, RefCell};
use std::iter;
use std::ops::Range;
use libc::c_uint;
use rustc_codegen_ssa::debuginfo::type_names;
use rustc_codegen_ssa::mir::debuginfo::VariableKind::*;
use rustc_codegen_ssa::mir::debuginfo::{DebugScope, FunctionDebugContext, VariableKind};
use rustc_codegen_ssa::traits::*;
use rustc_data_structures::sync::Lrc;
use rustc_data_structures::unord::UnordMap;
use rustc_hir::def_id::{DefId, DefIdMap};
use rustc_index::IndexVec;
use rustc_middle::mir;
use rustc_middle::ty::layout::LayoutOf;
use rustc_middle::ty::{self, GenericArgsRef, Instance, ParamEnv, Ty, TypeVisitableExt};
use rustc_session::config::{self, DebugInfo};
use rustc_session::Session;
use rustc_span::symbol::Symbol;
use rustc_span::{
BytePos, Pos, SourceFile, SourceFileAndLine, SourceFileHash, Span, StableSourceFileId,
};
use rustc_target::abi::Size;
use smallvec::SmallVec;
use tracing::debug;
use self::metadata::{file_metadata, type_di_node, UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER};
use self::namespace::mangled_name_of_instance;
use self::utils::{create_DIArray, is_node_local_to_unit, DIB};
use crate::abi::FnAbi;
use crate::builder::Builder;
use crate::common::CodegenCx;
use crate::llvm;
use crate::llvm::debuginfo::{
DIArray, DIBuilder, DIFile, DIFlags, DILexicalBlock, DILocation, DISPFlags, DIScope, DIType,
DIVariable,
};
use crate::value::Value;
mod create_scope_map;
mod gdb;
pub(crate) mod metadata;
mod namespace;
mod utils;
use self::create_scope_map::compute_mir_scopes;
pub(crate) use self::metadata::build_global_var_di_node;
#[allow(non_upper_case_globals)]
const DW_TAG_auto_variable: c_uint = 0x100;
#[allow(non_upper_case_globals)]
const DW_TAG_arg_variable: c_uint = 0x101;
/// A context object for maintaining all state needed by the debuginfo module.
pub(crate) struct CodegenUnitDebugContext<'ll, 'tcx> {
llcontext: &'ll llvm::Context,
llmod: &'ll llvm::Module,
builder: &'ll mut DIBuilder<'ll>,
created_files: RefCell<UnordMap<Option<(StableSourceFileId, SourceFileHash)>, &'ll DIFile>>,
type_map: metadata::TypeMap<'ll, 'tcx>,
namespace_map: RefCell<DefIdMap<&'ll DIScope>>,
recursion_marker_type: OnceCell<&'ll DIType>,
}
impl Drop for CodegenUnitDebugContext<'_, '_> {
fn drop(&mut self) {
unsafe {
llvm::LLVMRustDIBuilderDispose(&mut *(self.builder as *mut _));
}
}
}
impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
pub(crate) fn new(llmod: &'ll llvm::Module) -> Self {
debug!("CodegenUnitDebugContext::new");
let builder = unsafe { llvm::LLVMRustDIBuilderCreate(llmod) };
// DIBuilder inherits context from the module, so we'd better use the same one
let llcontext = unsafe { llvm::LLVMGetModuleContext(llmod) };
CodegenUnitDebugContext {
llcontext,
llmod,
builder,
created_files: Default::default(),
type_map: Default::default(),
namespace_map: RefCell::new(Default::default()),
recursion_marker_type: OnceCell::new(),
}
}
pub(crate) fn finalize(&self, sess: &Session) {
unsafe {
llvm::LLVMRustDIBuilderFinalize(self.builder);
if !sess.target.is_like_msvc {
// Debuginfo generation in LLVM by default uses a higher
// version of dwarf than macOS currently understands. We can
// instruct LLVM to emit an older version of dwarf, however,
// for macOS to understand. For more info see #11352
// This can be overridden using --llvm-opts -dwarf-version,N.
// Android has the same issue (#22398)
let dwarf_version = sess
.opts
.unstable_opts
.dwarf_version
.unwrap_or(sess.target.default_dwarf_version);
llvm::LLVMRustAddModuleFlagU32(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
c"Dwarf Version".as_ptr(),
dwarf_version,
);
} else {
// Indicate that we want CodeView debug information on MSVC
llvm::LLVMRustAddModuleFlagU32(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
c"CodeView".as_ptr(),
1,
)
}
// Prevent bitcode readers from deleting the debug info.
llvm::LLVMRustAddModuleFlagU32(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
c"Debug Info Version".as_ptr(),
llvm::LLVMRustDebugMetadataVersion(),
);
}
}
}
/// Creates any deferred debug metadata nodes
pub(crate) fn finalize(cx: &CodegenCx<'_, '_>) {
if let Some(dbg_cx) = &cx.dbg_cx {
debug!("finalize");
if gdb::needs_gdb_debug_scripts_section(cx) {
// Add a .debug_gdb_scripts section to this compile-unit. This will
// cause GDB to try and load the gdb_load_rust_pretty_printers.py file,
// which activates the Rust pretty printers for binary this section is
// contained in.
gdb::get_or_insert_gdb_debug_scripts_section_global(cx);
}
dbg_cx.finalize(cx.sess());
}
}
impl<'ll> DebugInfoBuilderMethods for Builder<'_, 'll, '_> {
// FIXME(eddyb) find a common convention for all of the debuginfo-related
// names (choose between `dbg`, `debug`, `debuginfo`, `debug_info` etc.).
fn dbg_var_addr(
&mut self,
dbg_var: &'ll DIVariable,
dbg_loc: &'ll DILocation,
variable_alloca: Self::Value,
direct_offset: Size,
indirect_offsets: &[Size],
fragment: Option<Range<Size>>,
) {
// Convert the direct and indirect offsets and fragment byte range to address ops.
// FIXME(eddyb) use `const`s instead of getting the values via FFI,
// the values should match the ones in the DWARF standard anyway.
let op_deref = || unsafe { llvm::LLVMRustDIBuilderCreateOpDeref() };
let op_plus_uconst = || unsafe { llvm::LLVMRustDIBuilderCreateOpPlusUconst() };
let op_llvm_fragment = || unsafe { llvm::LLVMRustDIBuilderCreateOpLLVMFragment() };
let mut addr_ops = SmallVec::<[u64; 8]>::new();
if direct_offset.bytes() > 0 {
addr_ops.push(op_plus_uconst());
addr_ops.push(direct_offset.bytes() as u64);
}
for &offset in indirect_offsets {
addr_ops.push(op_deref());
if offset.bytes() > 0 {
addr_ops.push(op_plus_uconst());
addr_ops.push(offset.bytes() as u64);
}
}
if let Some(fragment) = fragment {
// `DW_OP_LLVM_fragment` takes as arguments the fragment's
// offset and size, both of them in bits.
addr_ops.push(op_llvm_fragment());
addr_ops.push(fragment.start.bits() as u64);
addr_ops.push((fragment.end - fragment.start).bits() as u64);
}
unsafe {
// FIXME(eddyb) replace `llvm.dbg.declare` with `llvm.dbg.addr`.
llvm::LLVMRustDIBuilderInsertDeclareAtEnd(
DIB(self.cx()),
variable_alloca,
dbg_var,
addr_ops.as_ptr(),
addr_ops.len() as c_uint,
dbg_loc,
self.llbb(),
);
}
}
fn set_dbg_loc(&mut self, dbg_loc: &'ll DILocation) {
unsafe {
llvm::LLVMSetCurrentDebugLocation2(self.llbuilder, dbg_loc);
}
}
fn insert_reference_to_gdb_debug_scripts_section_global(&mut self) {
gdb::insert_reference_to_gdb_debug_scripts_section_global(self)
}
fn set_var_name(&mut self, value: &'ll Value, name: &str) {
// Avoid wasting time if LLVM value names aren't even enabled.
if self.sess().fewer_names() {
return;
}
// Only function parameters and instructions are local to a function,
// don't change the name of anything else (e.g. globals).
let param_or_inst = unsafe {
llvm::LLVMIsAArgument(value).is_some() || llvm::LLVMIsAInstruction(value).is_some()
};
if !param_or_inst {
return;
}
// Avoid replacing the name if it already exists.
// While we could combine the names somehow, it'd
// get noisy quick, and the usefulness is dubious.
if llvm::get_value_name(value).is_empty() {
llvm::set_value_name(value, name.as_bytes());
}
}
}
/// A source code location used to generate debug information.
// FIXME(eddyb) rename this to better indicate it's a duplicate of
// `rustc_span::Loc` rather than `DILocation`, perhaps by making
// `lookup_char_pos` return the right information instead.
struct DebugLoc {
/// Information about the original source file.
file: Lrc<SourceFile>,
/// The (1-based) line number.
line: u32,
/// The (1-based) column number.
col: u32,
}
impl CodegenCx<'_, '_> {
/// Looks up debug source information about a `BytePos`.
// FIXME(eddyb) rename this to better indicate it's a duplicate of
// `lookup_char_pos` rather than `dbg_loc`, perhaps by making
// `lookup_char_pos` return the right information instead.
fn lookup_debug_loc(&self, pos: BytePos) -> DebugLoc {
let (file, line, col) = match self.sess().source_map().lookup_line(pos) {
Ok(SourceFileAndLine { sf: file, line }) => {
let line_pos = file.lines()[line];
// Use 1-based indexing.
let line = (line + 1) as u32;
let col = (file.relative_position(pos) - line_pos).to_u32() + 1;
(file, line, col)
}
Err(file) => (file, UNKNOWN_LINE_NUMBER, UNKNOWN_COLUMN_NUMBER),
};
// For MSVC, omit the column number.
// Otherwise, emit it. This mimics clang behaviour.
// See discussion in https://github.com/rust-lang/rust/issues/42921
if self.sess().target.is_like_msvc {
DebugLoc { file, line, col: UNKNOWN_COLUMN_NUMBER }
} else {
DebugLoc { file, line, col }
}
}
}
impl<'ll, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx> {
fn create_function_debug_context(
&self,
instance: Instance<'tcx>,
fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
llfn: &'ll Value,
mir: &mir::Body<'tcx>,
) -> Option<FunctionDebugContext<'tcx, &'ll DIScope, &'ll DILocation>> {
if self.sess().opts.debuginfo == DebugInfo::None {
return None;
}
// Initialize fn debug context (including scopes).
let empty_scope = DebugScope {
dbg_scope: self.dbg_scope_fn(instance, fn_abi, Some(llfn)),
inlined_at: None,
file_start_pos: BytePos(0),
file_end_pos: BytePos(0),
};
let mut fn_debug_context = FunctionDebugContext {
scopes: IndexVec::from_elem(empty_scope, &mir.source_scopes),
inlined_function_scopes: Default::default(),
};
// Fill in all the scopes, with the information from the MIR body.
compute_mir_scopes(self, instance, mir, &mut fn_debug_context);
Some(fn_debug_context)
}
fn dbg_scope_fn(
&self,
instance: Instance<'tcx>,
fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
maybe_definition_llfn: Option<&'ll Value>,
) -> &'ll DIScope {
let tcx = self.tcx;
let def_id = instance.def_id();
let (containing_scope, is_method) = get_containing_scope(self, instance);
let span = tcx.def_span(def_id);
let loc = self.lookup_debug_loc(span.lo());
let file_metadata = file_metadata(self, &loc.file);
let function_type_metadata = unsafe {
let fn_signature = get_function_signature(self, fn_abi);
llvm::LLVMRustDIBuilderCreateSubroutineType(DIB(self), fn_signature)
};
let mut name = String::with_capacity(64);
type_names::push_item_name(tcx, def_id, false, &mut name);
// Find the enclosing function, in case this is a closure.
let enclosing_fn_def_id = tcx.typeck_root_def_id(def_id);
// We look up the generics of the enclosing function and truncate the args
// to their length in order to cut off extra stuff that might be in there for
// closures or coroutines.
let generics = tcx.generics_of(enclosing_fn_def_id);
let args = instance.args.truncate_to(tcx, generics);
type_names::push_generic_params(
tcx,
tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), args),
enclosing_fn_def_id,
&mut name,
);
let template_parameters = get_template_parameters(self, generics, args);
let linkage_name = &mangled_name_of_instance(self, instance).name;
// Omit the linkage_name if it is the same as subprogram name.
let linkage_name = if &name == linkage_name { "" } else { linkage_name };
// FIXME(eddyb) does this need to be separate from `loc.line` for some reason?
let scope_line = loc.line;
let mut flags = DIFlags::FlagPrototyped;
if fn_abi.ret.layout.abi.is_uninhabited() {
flags |= DIFlags::FlagNoReturn;
}
let mut spflags = DISPFlags::SPFlagDefinition;
if is_node_local_to_unit(self, def_id) {
spflags |= DISPFlags::SPFlagLocalToUnit;
}
if self.sess().opts.optimize != config::OptLevel::No {
spflags |= DISPFlags::SPFlagOptimized;
}
if let Some((id, _)) = tcx.entry_fn(()) {
if id == def_id {
spflags |= DISPFlags::SPFlagMainSubprogram;
}
}
// When we're adding a method to a type DIE, we only want a DW_AT_declaration there, because
// LLVM LTO can't unify type definitions when a child DIE is a full subprogram definition.
// When we use this `decl` below, the subprogram definition gets created at the CU level
// with a DW_AT_specification pointing back to the type's declaration.
let decl = is_method.then(|| unsafe {
llvm::LLVMRustDIBuilderCreateMethod(
DIB(self),
containing_scope,
name.as_ptr().cast(),
name.len(),
linkage_name.as_ptr().cast(),
linkage_name.len(),
file_metadata,
loc.line,
function_type_metadata,
flags,
spflags & !DISPFlags::SPFlagDefinition,
template_parameters,
)
});
return unsafe {
llvm::LLVMRustDIBuilderCreateFunction(
DIB(self),
containing_scope,
name.as_ptr().cast(),
name.len(),
linkage_name.as_ptr().cast(),
linkage_name.len(),
file_metadata,
loc.line,
function_type_metadata,
scope_line,
flags,
spflags,
maybe_definition_llfn,
template_parameters,
decl,
)
};
fn get_function_signature<'ll, 'tcx>(
cx: &CodegenCx<'ll, 'tcx>,
fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
) -> &'ll DIArray {
if cx.sess().opts.debuginfo != DebugInfo::Full {
return create_DIArray(DIB(cx), &[]);
}
let mut signature = Vec::with_capacity(fn_abi.args.len() + 1);
// Return type -- llvm::DIBuilder wants this at index 0
signature.push(if fn_abi.ret.is_ignore() {
None
} else {
Some(type_di_node(cx, fn_abi.ret.layout.ty))
});
// Arguments types
if cx.sess().target.is_like_msvc {
// FIXME(#42800):
// There is a bug in MSDIA that leads to a crash when it encounters
// a fixed-size array of `u8` or something zero-sized in a
// function-type (see #40477).
// As a workaround, we replace those fixed-size arrays with a
// pointer-type. So a function `fn foo(a: u8, b: [u8; 4])` would
// appear as `fn foo(a: u8, b: *const u8)` in debuginfo,
// and a function `fn bar(x: [(); 7])` as `fn bar(x: *const ())`.
// This transformed type is wrong, but these function types are
// already inaccurate due to ABI adjustments (see #42800).
signature.extend(fn_abi.args.iter().map(|arg| {
let t = arg.layout.ty;
let t = match t.kind() {
ty::Array(ct, _)
if (*ct == cx.tcx.types.u8) || cx.layout_of(*ct).is_zst() =>
{
Ty::new_imm_ptr(cx.tcx, *ct)
}
_ => t,
};
Some(type_di_node(cx, t))
}));
} else {
signature
.extend(fn_abi.args.iter().map(|arg| Some(type_di_node(cx, arg.layout.ty))));
}
create_DIArray(DIB(cx), &signature[..])
}
fn get_template_parameters<'ll, 'tcx>(
cx: &CodegenCx<'ll, 'tcx>,
generics: &ty::Generics,
args: GenericArgsRef<'tcx>,
) -> &'ll DIArray {
if args.types().next().is_none() {
return create_DIArray(DIB(cx), &[]);
}
// Again, only create type information if full debuginfo is enabled
let template_params: Vec<_> = if cx.sess().opts.debuginfo == DebugInfo::Full {
let names = get_parameter_names(cx, generics);
iter::zip(args, names)
.filter_map(|(kind, name)| {
kind.as_type().map(|ty| {
let actual_type =
cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), ty);
let actual_type_metadata = type_di_node(cx, actual_type);
let name = name.as_str();
unsafe {
Some(llvm::LLVMRustDIBuilderCreateTemplateTypeParameter(
DIB(cx),
None,
name.as_ptr().cast(),
name.len(),
actual_type_metadata,
))
}
})
})
.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_else(Vec::new, |def_id| {
get_parameter_names(cx, cx.tcx.generics_of(def_id))
});
names.extend(generics.own_params.iter().map(|param| param.name));
names
}
/// Returns a scope, plus `true` if that's a type scope for "class" methods,
/// otherwise `false` for plain namespace scopes.
fn get_containing_scope<'ll, 'tcx>(
cx: &CodegenCx<'ll, 'tcx>,
instance: Instance<'tcx>,
) -> (&'ll DIScope, bool) {
// 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.
if let Some(impl_def_id) = cx.tcx.impl_of_method(instance.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.instantiate_and_normalize_erasing_regions(
instance.args,
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`).
if let ty::Adt(def, ..) = impl_self_ty.kind()
&& !def.is_box()
{
// Again, only create type information if full debuginfo is enabled
if cx.sess().opts.debuginfo == DebugInfo::Full && !impl_self_ty.has_param()
{
return (type_di_node(cx, impl_self_ty), true);
} else {
return (namespace::item_namespace(cx, def.did()), false);
}
}
} else {
// For trait method impls we still use the "parallel namespace"
// strategy
}
}
let scope = 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?"),
},
);
(scope, false)
}
}
fn dbg_loc(
&self,
scope: &'ll DIScope,
inlined_at: Option<&'ll DILocation>,
span: Span,
) -> &'ll DILocation {
// When emitting debugging information, DWARF (i.e. everything but MSVC)
// treats line 0 as a magic value meaning that the code could not be
// attributed to any line in the source. That's also exactly what dummy
// spans are. Make that equivalence here, rather than passing dummy spans
// to lookup_debug_loc, which will return line 1 for them.
let (line, col) = if span.is_dummy() && !self.sess().target.is_like_msvc {
(0, 0)
} else {
let DebugLoc { line, col, .. } = self.lookup_debug_loc(span.lo());
(line, col)
};
unsafe { llvm::LLVMRustDIBuilderCreateDebugLocation(line, col, scope, inlined_at) }
}
fn create_vtable_debuginfo(
&self,
ty: Ty<'tcx>,
trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>,
vtable: Self::Value,
) {
metadata::create_vtable_di_node(self, ty, trait_ref, vtable)
}
fn extend_scope_to_file(
&self,
scope_metadata: &'ll DIScope,
file: &rustc_span::SourceFile,
) -> &'ll DILexicalBlock {
metadata::extend_scope_to_file(self, scope_metadata, file)
}
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,
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);
let type_metadata = type_di_node(self, variable_type);
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,
type_metadata,
true,
DIFlags::FlagZero,
argument_index,
align.bytes() as u32,
)
}
}
}