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debuginfo: Add comment on is_local_to_unit parameter.

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This commit is contained in:
Michael Woerister 2013-12-14 17:12:59 +01:00
parent d35fff8994
commit 9384de77bb
1 changed files with 7 additions and 0 deletions
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7
src/librustc/middle/trans/debuginfo.rs
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@ -690,6 +690,13 @@ pub fn create_function_debug_context(cx: &mut CrateContext,
// Clang sets this parameter to the opening brace of the function's block, so let's do this too.
let scope_line = span_start(cx, top_level_block.span).line;
// The is_local_to_unit flag indicates whether a function is local to the current compilation
// unit (i.e. if it is *static* in the C-sense). The *reachable* set should provide a good
// approximation of this, as it contains everything that might leak out of the current crate
// (by being externally visible or by being inlined into something externally visible). It might
// better to use the `exported_items` set from `driver::CrateAnalysis` in the future, but (atm)
// this set is not available in the translation pass.
let is_local_to_unit = !cx.reachable.contains(&fn_ast_id);
let fn_metadata = function_name.with_c_str(|function_name| {