From a4c56923d264431ba21a54b0ba7b095cfc740128 Mon Sep 17 00:00:00 2001
From: Vedant Kumar <vsk@apple.com>
Date: Wed, 28 Feb 2018 19:00:16 +0000
Subject: [PATCH] [profile] Test the exported symbol set for empty programs

Programs without any code in them should export the exact same set of
symbols as programs with code, at least on Darwin. This is done to make
text-based API verification possible for certain Darwin frameworks.

llvm-svn: 326351
---
 .../test/profile/instrprof-darwin-dead-strip.c   | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/compiler-rt/test/profile/instrprof-darwin-dead-strip.c b/compiler-rt/test/profile/instrprof-darwin-dead-strip.c
index 03049335efda..6a2bffc213a3 100644
--- a/compiler-rt/test/profile/instrprof-darwin-dead-strip.c
+++ b/compiler-rt/test/profile/instrprof-darwin-dead-strip.c
@@ -1,7 +1,7 @@
 // REQUIRES: osx-ld64-live_support
 // REQUIRES: lto
 
-// RUN: %clang_profgen=%t.profraw -fcoverage-mapping -mllvm -enable-name-compression=false -Wl,-dead_strip -o %t %s
+// RUN: %clang_profgen=%t.profraw -fcoverage-mapping -mllvm -enable-name-compression=false -DCODE=1 -Wl,-dead_strip -o %t %s
 // RUN: %run %t
 // RUN: llvm-profdata merge -o %t.profdata %t.profraw
 // RUN: llvm-profdata show --all-functions %t.profdata | FileCheck %s -check-prefix=PROF
@@ -10,7 +10,7 @@
 // RUN: otool -s __DATA __llvm_prf_names %t | FileCheck %s -check-prefix=PRF_NAMES
 // RUN: otool -s __DATA __llvm_prf_cnts %t | FileCheck %s -check-prefix=PRF_CNTS
 
-// RUN: %clang_lto_profgen=%t.lto.profraw -fcoverage-mapping -mllvm -enable-name-compression=false -Wl,-dead_strip -flto -o %t.lto %s
+// RUN: %clang_lto_profgen=%t.lto.profraw -fcoverage-mapping -mllvm -enable-name-compression=false -DCODE=1 -Wl,-dead_strip -flto -o %t.lto %s
 // RUN: %run %t.lto
 // RUN: llvm-profdata merge -o %t.lto.profdata %t.lto.profraw
 // RUN: llvm-profdata show --all-functions %t.lto.profdata | FileCheck %s -check-prefix=PROF
@@ -22,12 +22,24 @@
 // Note: We expect foo() and some of the profiling data associated with it to
 // be dead-stripped.
 
+// Note: When there is no code in a program, we expect to see the exact same
+// set of external functions provided by the profile runtime.
+
+// RUN: %clang_profgen -fcoverage-mapping -Wl,-dead_strip -dynamiclib -o %t.nocode.dylib %s
+// RUN: nm -jgU %t.nocode.dylib > %t.nocode.syms
+// RUN: nm -jgU %t | grep -vE "main|foo|mh_execute_header" > %t.code.syms
+// RUN: diff %t.nocode.syms %t.code.syms
+
+#ifdef CODE
+
 // COV: [[@LINE+1]]{{ *}}|{{ *}}0|void foo()
 void foo() {}
 
 // COV: [[@LINE+1]]{{ *}}|{{ *}}1|int main
 int main() { return 0; }
 
+#endif // CODE
+
 // NM-NOT: foo
 
 // PROF: Counters: