[sanitizers] improve debug output for failed suppression parse (llvm#72066)

If a sanitizer suppression file can not be parsed, add the supported
suppression types to the error message.

See llvm#72060.

---------

Co-authored-by: Vitaly Buka <[email protected]>

Author: schenker

compiler-rt/lib/sanitizer_common/sanitizer_suppressions.cpp

@@ -138,7 +138,10 @@ void SuppressionContext::Parse(const char *str) {
         }
       }
       if (type == suppression_types_num_) {
-        Printf("%s: failed to parse suppressions\n", SanitizerToolName);
+        Printf("%s: failed to parse suppressions.\n", SanitizerToolName);
+        Printf("Supported suppression types are:\n");
+        for (type = 0; type < suppression_types_num_; type++)
+          Printf("- %s\n", suppression_types_[type]);
         Die();
       }
       Suppression s;

compiler-rt/lib/sanitizer_common/tests/sanitizer_suppressions_test.cpp

@@ -130,9 +130,15 @@ TEST_F(SuppressionContextTest, HasSuppressionType) {
 }
 
 TEST_F(SuppressionContextTest, RegressionTestForBufferOverflowInSuppressions) {
-  EXPECT_DEATH(ctx_.Parse("race"), "failed to parse suppressions");
-  EXPECT_DEATH(ctx_.Parse("foo"), "failed to parse suppressions");
+  const char *expected_output =
+      "failed to parse suppressions.\n"
+      "Supported suppression types are:\n"
+      "- race\n"
+      "- thread\n"
+      "- mutex\n"
+      "- signal\n";
+  EXPECT_DEATH(ctx_.Parse("race"), expected_output);
+  EXPECT_DEATH(ctx_.Parse("foo"), expected_output);
 }
 
-
 }  // namespace __sanitizer