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|
use super::metadata::{file_metadata, UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER};
use super::utils::DIB;
use rustc_codegen_ssa::mir::debuginfo::{DebugScope, FunctionDebugContext};
use rustc_codegen_ssa::traits::*;
use crate::abi::FnAbi;
use crate::common::CodegenCx;
use crate::llvm;
use crate::llvm::debuginfo::{DILocation, DIScope};
use rustc::mir::{Body, SourceScope};
use rustc::ty::layout::FnAbiExt;
use rustc::ty::{self, Instance};
use rustc_index::bit_set::BitSet;
use rustc_index::vec::Idx;
/// Produces DIScope DIEs for each MIR Scope which has variables defined in it.
// FIXME(eddyb) almost all of this should be in `rustc_codegen_ssa::mir::debuginfo`.
pub fn compute_mir_scopes(
cx: &CodegenCx<'ll, 'tcx>,
instance: Instance<'tcx>,
mir: &Body<'tcx>,
fn_dbg_scope: &'ll DIScope,
debug_context: &mut FunctionDebugContext<&'ll DIScope, &'ll DILocation>,
) {
// Find all the scopes with variables defined in them.
let mut has_variables = BitSet::new_empty(mir.source_scopes.len());
// FIXME(eddyb) take into account that arguments always have debuginfo,
// irrespective of their name (assuming full debuginfo is enabled).
for var_debug_info in &mir.var_debug_info {
has_variables.insert(var_debug_info.source_info.scope);
}
// Instantiate all scopes.
for idx in 0..mir.source_scopes.len() {
let scope = SourceScope::new(idx);
make_mir_scope(cx, instance, &mir, fn_dbg_scope, &has_variables, debug_context, scope);
}
}
fn make_mir_scope(
cx: &CodegenCx<'ll, 'tcx>,
instance: Instance<'tcx>,
mir: &Body<'tcx>,
fn_dbg_scope: &'ll DIScope,
has_variables: &BitSet<SourceScope>,
debug_context: &mut FunctionDebugContext<&'ll DIScope, &'ll DILocation>,
scope: SourceScope,
) {
if debug_context.scopes[scope].dbg_scope.is_some() {
return;
}
let scope_data = &mir.source_scopes[scope];
let parent_scope = if let Some(parent) = scope_data.parent_scope {
make_mir_scope(cx, instance, mir, fn_dbg_scope, has_variables, debug_context, parent);
debug_context.scopes[parent]
} else {
// The root is the function itself.
let loc = cx.lookup_debug_loc(mir.span.lo());
debug_context.scopes[scope] = DebugScope {
dbg_scope: Some(fn_dbg_scope),
inlined_at: None,
file_start_pos: loc.file.start_pos,
file_end_pos: loc.file.end_pos,
};
return;
};
if !has_variables.contains(scope) && scope_data.inlined.is_none() {
// Do not create a DIScope if there are no variables defined in this
// MIR `SourceScope`, and it's not `inlined`, to avoid debuginfo bloat.
debug_context.scopes[scope] = parent_scope;
return;
}
let loc = cx.lookup_debug_loc(scope_data.span.lo());
let file_metadata = file_metadata(cx, &loc.file);
let dbg_scope = match scope_data.inlined {
Some((callee, _)) => {
// FIXME(eddyb) this would be `self.monomorphize(&callee)`
// if this is moved to `rustc_codegen_ssa::mir::debuginfo`.
let callee = cx.tcx.subst_and_normalize_erasing_regions(
instance.substs,
ty::ParamEnv::reveal_all(),
&callee,
);
let callee_fn_abi = FnAbi::of_instance(cx, callee, &[]);
cx.dbg_scope_fn(callee, &callee_fn_abi, None)
}
None => unsafe {
llvm::LLVMRustDIBuilderCreateLexicalBlock(
DIB(cx),
parent_scope.dbg_scope.unwrap(),
file_metadata,
loc.line.unwrap_or(UNKNOWN_LINE_NUMBER),
loc.col.unwrap_or(UNKNOWN_COLUMN_NUMBER),
)
},
};
let inlined_at = scope_data.inlined.map(|(_, callsite_span)| {
// FIXME(eddyb) this doesn't account for the macro-related
// `Span` fixups that `rustc_codegen_ssa::mir::debuginfo` does.
let callsite_scope = parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
cx.dbg_loc(callsite_scope, parent_scope.inlined_at, callsite_span)
});
debug_context.scopes[scope] = DebugScope {
dbg_scope: Some(dbg_scope),
inlined_at: inlined_at.or(parent_scope.inlined_at),
file_start_pos: loc.file.start_pos,
file_end_pos: loc.file.end_pos,
};
}
|
