Rollup merge of #54488 - zackmdavis:and_the_case_of_the_unused_crate, r=estebank

[rust.git] / src / librustc_save_analysis / dump_visitor.rs

diff --git a/src/librustc_save_analysis/dump_visitor.rs b/src/librustc_save_analysis/dump_visitor.rs
index d719d257f352c6a9d61cd017a2cab3a665f24183..ab8f468672944eb070864a0b9df3257badcb85be 100644 (file)
--- a/src/librustc_save_analysis/dump_visitor.rs
+++ b/src/librustc_save_analysis/dump_visitor.rs
@@ -25,10 +25,12 @@
 
 use rustc::hir::def::Def as HirDef;
 use rustc::hir::def_id::DefId;
+use rustc::session::config::Input;
 use rustc::ty::{self, TyCtxt};
 use rustc_data_structures::fx::FxHashSet;
 
 use std::path::Path;
+use std::env;
 
 use syntax::ast::{self, Attribute, NodeId, PatKind, CRATE_NODE_ID};
 use syntax::parse::token;
@@ -49,8 +51,8 @@
 use span_utils::SpanUtils;
 use sig;
 
-use rls_data::{CratePreludeData, Def, DefKind, GlobalCrateId, Import, ImportKind, Ref, RefKind,
-               Relation, RelationKind, SpanData};
+use rls_data::{CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import,
+               ImportKind, Ref, RefKind, Relation, RelationKind, SpanData};
 
 macro_rules! down_cast_data {
     ($id:ident, $kind:ident, $sp:expr) => {
@@ -169,6 +171,54 @@ pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
         self.dumper.crate_prelude(data);
     }
 
+    pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
+        // Apply possible `remap-path-prefix` remapping to the input source file
+        // (and don't include remapping args anymore)
+        let (program, arguments) = {
+            let remap_arg_indices = {
+                let mut indices = FxHashSet();
+                // Args are guaranteed to be valid UTF-8 (checked early)
+                for (i, e) in env::args().enumerate() {
+                    if e.starts_with("--remap-path-prefix=") {
+                        indices.insert(i);
+                    } else if e == "--remap-path-prefix" {
+                        indices.insert(i);
+                        indices.insert(i + 1);
+                    }
+                }
+                indices
+            };
+
+            let mut args = env::args()
+                .enumerate()
+                .filter(|(i, _)| !remap_arg_indices.contains(i))
+                .map(|(_, arg)| {
+                    match input {
+                        Input::File(ref path) if path == Path::new(&arg) => {
+                            let mapped = &self.tcx.sess.local_crate_source_file;
+                            mapped
+                                .as_ref()
+                                .unwrap()
+                                .to_string_lossy()
+                                .into()
+                        },
+                        _ => arg,
+                    }
+                });
+
+            (args.next().unwrap(), args.collect())
+        };
+
+        let data = CompilationOptions {
+            directory: self.tcx.sess.working_dir.0.clone(),
+            program,
+            arguments,
+            output: self.save_ctxt.compilation_output(crate_name),
+        };
+
+        self.dumper.compilation_opts(data);
+    }
+
     // Return all non-empty prefixes of a path.
     // For each prefix, we return the span for the last segment in the prefix and
     // a str representation of the entire prefix.