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Auto merge of #99556 - davidtwco:collapse-debuginfo, r=wesleywiser

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ssa: implement `#[collapse_debuginfo]`

cc #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
This commit is contained in:
bors 2022-09-13 01:19:05 +00:00
commit 0df1ddc185
21 changed files with 700 additions and 36 deletions
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2
compiler/rustc_feature/src/active.rs
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@ -338,6 +338,8 @@ declare_features! (
(active, closure_track_caller, "1.57.0", Some(87417), None),
/// Allows to use the `#[cmse_nonsecure_entry]` attribute.
(active, cmse_nonsecure_entry, "1.48.0", Some(75835), None),
/// Allows use of the `#[collapse_debuginfo]` attribute.
(active, collapse_debuginfo, "CURRENT_RUSTC_VERSION", Some(100758), None),
/// Allows `async {}` expressions in const contexts.
(active, const_async_blocks, "1.53.0", Some(85368), None),
// Allows limiting the evaluation steps of const expressions