Don't discard value names when using address or memory sanitizer

The value names are used when reporting issues found by address
sanitizer or memory sanitizer. Avoid discarding names when those
sanitizers are enabled, unless explicitly requested to do otherwise.

Author: tmiasko

src/librustc/session/mod.rs

@@ -7,7 +7,7 @@ use rustc_data_structures::fingerprint::Fingerprint;
 
 use crate::lint;
 use crate::lint::builtin::BuiltinLintDiagnostics;
-use crate::session::config::{OutputType, PrintRequest, SwitchWithOptPath};
+use crate::session::config::{OutputType, PrintRequest, Sanitizer, SwitchWithOptPath};
 use crate::session::search_paths::{PathKind, SearchPath};
 use crate::util::nodemap::{FxHashMap, FxHashSet};
 use crate::util::common::{duration_to_secs_str, ErrorReported};
@@ -626,6 +626,14 @@ impl Session {
             .output_types
             .contains_key(&OutputType::LlvmAssembly)
             || self.opts.output_types.contains_key(&OutputType::Bitcode);
+
+        // Address sanitizer and memory sanitizer use alloca name when reporting an issue.
+        let more_names = match self.opts.debugging_opts.sanitizer {
+            Some(Sanitizer::Address) => true,
+            Some(Sanitizer::Memory) => true,
+            _ => more_names,
+        };
+
         self.opts.debugging_opts.fewer_names || !more_names
     }
 

src/test/run-make-fulldeps/sanitizer-address/Makefile

@@ -24,4 +24,7 @@ endif
 
 all:
 	$(RUSTC) -g -Z sanitizer=address -Z print-link-args $(EXTRA_RUSTFLAG) overflow.rs | $(CGREP) librustc_asan
+	# Verify that stack buffer overflow is detected:
 	$(TMPDIR)/overflow 2>&1 | $(CGREP) stack-buffer-overflow
+	# Verify that variable name is included in address sanitizer report:
+	$(TMPDIR)/overflow 2>&1 | $(CGREP) "'xs'"