From 418da3fe80230c26afaa29db0787f709c67c74c3 Mon Sep 17 00:00:00 2001
From: Dean Michael Berris <dberris@google.com>
Date: Mon, 6 Mar 2017 07:08:21 +0000
Subject: [XRay] [clang] Allow logging the first argument of a function call.

Summary:
Functions with the "xray_log_args" attribute will tell LLVM to emit a special
XRay sled for compiler-rt to copy any call arguments to your logging handler.

Reviewers: dberris

Reviewed By: dberris

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D29704

llvm-svn: 296999
---
 clang/lib/CodeGen/CodeGenFunction.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'clang/lib/CodeGen/CodeGenFunction.cpp')

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 1ebfd79..bad963b 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -779,6 +779,10 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
         Fn->addFnAttr("function-instrument", "xray-always");
       if (XRayAttr->neverXRayInstrument())
         Fn->addFnAttr("function-instrument", "xray-never");
+      if (const auto *LogArgs = D->getAttr<XRayLogArgsAttr>()) {
+        Fn->addFnAttr("xray-log-args",
+                      llvm::utostr(LogArgs->getArgumentCount()));
+      }
     } else {
       Fn->addFnAttr(
           "xray-instruction-threshold",
-- 
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