Auto merge of rust-lang#99556 - davidtwco:collapse-debuginfo, r=wesle…

…ywiser

ssa: implement `#[collapse_debuginfo]`

cc rust-lang#39153 rust-lang/compiler-team#386

Debuginfo line information for macro invocations are collapsed by default - line information are replaced by the line of the outermost expansion site. Using `-Zdebug-macros` disables this behaviour.

When the `collapse_debuginfo` feature is enabled, the default behaviour is reversed so that debuginfo is not collapsed by default. In addition, the `#[collapse_debuginfo]` attribute is available and can be applied to macro definitions which will then have their line information collapsed.

r? rust-lang/wg-debugging

src/debuginfo/line_info.rs

@@ -68,9 +68,9 @@ impl DebugContext {
  ) -> (Lrc<SourceFile>, u64, u64) {
  // Based on https://github.com/rust-lang/rust/blob/e369d87b015a84653343032833d65d0545fd3f26/src/librustc_codegen_ssa/mir/mod.rs#L116-L131
  // In order to have a good line stepping behavior in debugger, we overwrite debug
- // locations of macro expansions with that of the outermost expansion site
- // (unless the crate is being compiled with `-Z debug-macros`).
- let span = if !span.from_expansion() || tcx.sess.opts.unstable_opts.debug_macros {
+ // locations of macro expansions with that of the outermost expansion site (when the macro is
+ // annotated with `#[collapse_debuginfo]` or when `-Zdebug-macros` is provided).
+ let span = if tcx.should_collapse_debuginfo(span) {
  span
  } else {
  // Walk up the macro expansion chain until we reach a non-expanded span.