[XRay][darwin] Initial XRay in Darwin Support

Summary:
This change implements the changes required in both clang and
compiler-rt to allow building XRay-instrumented binaries in Darwin. For
now we limit this to x86_64. We also start building the XRay runtime
library in compiler-rt for osx.

A caveat to this is that we don't have the tests set up and running
yet, which we'll do in a set of follow-on changes.

This patch uses the monorepo layout for the coordinated change across
multiple projects.

Reviewers: kubamracek

Subscribers: mgorny, cfe-commits, llvm-commits

Differential Revision: https://reviews.llvm.org/D39114

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317875 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/XRayArgs.h b/include/clang/Driver/XRayArgs.h
index 83210d100a12cafd3621c8581b229c4c8ce642d0..01ad6b047fddf8a9cc0b690df23170ab2edb7d6b 100644 (file)
--- a/include/clang/Driver/XRayArgs.h
+++ b/include/clang/Driver/XRayArgs.h
@@ -30,6 +30,7 @@ public:
   XRayArgs(const ToolChain &TC, const llvm::opt::ArgList &Args);
   void addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
                llvm::opt::ArgStringList &CmdArgs, types::ID InputType) const;
+  bool needsXRayRt() const { return XRayInstrument; }
 };
 
 } // namespace driver

diff --git a/lib/Driver/ToolChains/Darwin.cpp b/lib/Driver/ToolChains/Darwin.cpp
index 39c4525f84d45aaa7a6674543bfa85695b130b5a..e689d4fa4454463bd306dd567fd704048f946954 100644 (file)
--- a/lib/Driver/ToolChains/Darwin.cpp
+++ b/lib/Driver/ToolChains/Darwin.cpp
@@ -18,6 +18,7 @@
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
 #include "clang/Driver/SanitizerArgs.h"
+#include "clang/Driver/XRayArgs.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/Path.h"
@@ -1098,6 +1099,11 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
   if (Sanitize.needsEsanRt())
     AddLinkSanitizerLibArgs(Args, CmdArgs, "esan");
 
+  const XRayArgs& XRay = getXRayArgs();
+  if (XRay.needsXRayRt() && isTargetMacOS()) {
+    AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.xray_osx.a", RLO_AlwaysLink);
+  }
+
   // Otherwise link libSystem, then the dynamic runtime library, and finally any
   // target specific static runtime library.
   CmdArgs.push_back("-lSystem");

diff --git a/lib/Driver/XRayArgs.cpp b/lib/Driver/XRayArgs.cpp
index 8d68a8432d39d7b8db74eb86a88932a475a635b4..f0dfb6681204475703ee32a6d03c41a7ab146df8 100644 (file)
--- a/lib/Driver/XRayArgs.cpp
+++ b/lib/Driver/XRayArgs.cpp
@@ -51,6 +51,15 @@ XRayArgs::XRayArgs(const ToolChain &TC, const ArgList &Args) {
         D.Diag(diag::err_drv_clang_unsupported)
             << (std::string(XRayInstrumentOption) + " on " + Triple.str());
       }
+    else if (Triple.getOS() == llvm::Triple::Darwin)
+      // Experimental support for macos.
+      switch (Triple.getArch()) {
+      case llvm::Triple::x86_64:
+        break;
+      default:
+        D.Diag(diag::err_drv_clang_unsupported)
+            << (std::string(XRayInstrumentOption) + " on " + Triple.str());
+      }
     else
       D.Diag(diag::err_drv_clang_unsupported)
           << (std::string(XRayInstrumentOption) + " on non-Linux target OS");