bjoernager/rust
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When the required discriminator value exceeds LLVM's limits, drop the debug info for the function instead of panicking.

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The maximum discriminator value LLVM can currently encode is 2^12. If macro use
results in more than 2^12 calls to the same function attributed to the same
callsite, and those calls are MIR-inlined, we will require more than the maximum
discriminator value to completely represent the debug information. Once we reach
that point drop the debug info instead.
This commit is contained in:
Kyle Huey 2024-11-18 18:48:10 -08:00
parent 1e4ebb0ccd
commit f5b023bd9c
5 changed files with 4175 additions and 31 deletions
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6
compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
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@ -20,7 +20,9 @@ use crate::traits::*;
pub struct FunctionDebugContext<'tcx, S, L> {
/// Maps from source code to the corresponding debug info scope.
pub scopes: IndexVec<mir::SourceScope, DebugScope<S, L>>,
/// May be None if the backend is not capable of representing the scope for
/// some reason.
pub scopes: IndexVec<mir::SourceScope, Option<DebugScope<S, L>>>,
/// Maps from an inlined function to its debug info declaration.
pub inlined_function_scopes: FxHashMap<Instance<'tcx>, S>,
@ -231,7 +233,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
&self,
source_info: mir::SourceInfo,
) -> Option<(Bx::DIScope, Option<Bx::DILocation>, Span)> {
let scope = &self.debug_context.as_ref()?.scopes[source_info.scope];
let scope = &self.debug_context.as_ref()?.scopes[source_info.scope]?;
let span = hygiene::walk_chain_collapsed(source_info.span, self.mir.span);
Some((scope.adjust_dbg_scope_for_span(self.cx, span), scope.inlined_at, span))
}