[XRay][compiler-rt] Support string-based config for Basic mode.

Summary:
This addresses http://llvm.org/PR36790.

This change allows the XRay Basic Mode implementation to use the
string-based initialization routine provided through
`__xray_log_init_mode(...)`. In the process, we've also deprecated some
flags defined for the `XRAY_OPTIONS` environment variable.

We then introduce another environment variable that can control the XRay
Basic Mode implementation through `XRAY_BASIC_OPTIONS`.

We also rename files from `xray_inmemory_log` to `xray_basic_logging` to
be more in line with the mode implementation.

Depends on D46174.

Reviewers: echristo, kpw, pelikan, eizan

Reviewed By: kpw

Subscribers: mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D46246

llvm-svn: 331507

1 files changed, 50 insertions, 0 deletions

diff --git a/compiler-rt/lib/xray/xray_basic_flags.cc b/compiler-rt/lib/xray/xray_basic_flags.cc
new file mode 100644
index 00000000000..14d805c71a8
--- /dev/null
+++ b/compiler-rt/lib/xray/xray_basic_flags.cc
@@ -0,0 +1,50 @@
+//===-- xray_basic_flags.cc -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of XRay, a dynamic runtime instrumentation system.
+//
+// XRay Basic flag parsing logic.
+//===----------------------------------------------------------------------===//
+
+#include "xray_basic_flags.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "xray_defs.h"
+
+using namespace __sanitizer;
+
+namespace __xray {
+
+/// Use via basicFlags().
+BasicFlags xray_basic_flags_dont_use_directly;
+
+void BasicFlags::setDefaults() XRAY_NEVER_INSTRUMENT {
+#define XRAY_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "xray_basic_flags.inc"
+#undef XRAY_FLAG
+}
+
+void registerXRayBasicFlags(FlagParser *P,
+                            BasicFlags *F) XRAY_NEVER_INSTRUMENT {
+#define XRAY_FLAG(Type, Name, DefaultValue, Description)                       \
+  RegisterFlag(P, #Name, Description, &F->Name);
+#include "xray_basic_flags.inc"
+#undef XRAY_FLAG
+}
+
+const char *useCompilerDefinedBasicFlags() XRAY_NEVER_INSTRUMENT {
+#ifdef XRAY_BASIC_OPTIONS
+  return SANITIZER_STRINGIFY(XRAY_BASIC_OPTIONS);
+#else
+  return "";
+#endif
+}
+
+} // namespace __xray