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//===-- xray_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 flag parsing logic.
//===----------------------------------------------------------------------===//
#include "xray_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 {
Flags xray_flags_dont_use_directly; // use via flags().
void Flags::setDefaults() XRAY_NEVER_INSTRUMENT {
#define XRAY_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
#include "xray_flags.inc"
#undef XRAY_FLAG
}
static void registerXRayFlags(FlagParser *P, Flags *F) XRAY_NEVER_INSTRUMENT {
#define XRAY_FLAG(Type, Name, DefaultValue, Description) \
RegisterFlag(P, #Name, Description, &F->Name);
#include "xray_flags.inc"
#undef XRAY_FLAG
}
// This function, as defined with the help of a macro meant to be introduced at
// build time of the XRay runtime, passes in a statically defined list of
// options that control XRay. This means users/deployments can tweak the
// defaults that override the hard-coded defaults in the xray_flags.inc at
// compile-time using the XRAY_DEFAULT_OPTIONS macro.
static const char *useCompilerDefinedFlags() XRAY_NEVER_INSTRUMENT {
#ifdef XRAY_DEFAULT_OPTIONS
// Do the double-layered string conversion to prevent badly crafted strings
// provided through the XRAY_DEFAULT_OPTIONS from causing compilation issues (or
// changing the semantics of the implementation through the macro). This ensures
// that we convert whatever XRAY_DEFAULT_OPTIONS is defined as a string literal.
#define XRAY_STRINGIZE(x) #x
#define XRAY_STRINGIZE_OPTIONS(options) XRAY_STRINGIZE(options)
return XRAY_STRINGIZE_OPTIONS(XRAY_DEFAULT_OPTIONS);
#else
return "";
#endif
}
void initializeFlags() XRAY_NEVER_INSTRUMENT {
SetCommonFlagsDefaults();
auto *F = flags();
F->setDefaults();
FlagParser XRayParser;
registerXRayFlags(&XRayParser, F);
RegisterCommonFlags(&XRayParser);
// Use options defaulted at compile-time for the runtime.
const char *XRayCompileFlags = useCompilerDefinedFlags();
XRayParser.ParseString(XRayCompileFlags);
// Override from environment variables.
XRayParser.ParseString(GetEnv("XRAY_OPTIONS"));
// Override from command line.
InitializeCommonFlags();
if (Verbosity())
ReportUnrecognizedFlags();
if (common_flags()->help) {
XRayParser.PrintFlagDescriptions();
}
}
} // namespace __xray
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