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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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6
compiler/rustc_feature/src/builtin_attrs.rs
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@ -478,6 +478,12 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
experimental!(deprecated_safe),
),
// `#[collapse_debuginfo]`
gated!(
collapse_debuginfo, Normal, template!(Word), WarnFollowing,
experimental!(collapse_debuginfo)
),
// ==========================================================================
// Internal attributes: Stability, deprecation, and unsafe:
// ==========================================================================