InstrProf: Fix shared object profiling

Change the API of the instrumented profiling library to work with shared
objects.

  - Most things are now declared hidden, so that each executable gets
    its own copy.

  - Initialization hooks up a linked list of writers.

  - The raw format with shared objects that are profiled consists of a
    concatenated series of profiles.  llvm-profdata knows how to deal
    with that since r208938.

<rdar://problem/16918688>

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208940 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 78 insertions, 0 deletions

diff --git a/test/profile/Inputs/instrprof-dynamic-a.cpp b/test/profile/Inputs/instrprof-dynamic-a.cpp
new file mode 100644
index 000000000..67de263c4
--- /dev/null
+++ b/test/profile/Inputs/instrprof-dynamic-a.cpp
@@ -0,0 +1,7 @@
+#include "instrprof-dynamic-header.h"
+void a() {
+  if (true) {
+    bar<void>();
+    bar<char>();
+  }
+}
diff --git a/test/profile/Inputs/instrprof-dynamic-b.cpp b/test/profile/Inputs/instrprof-dynamic-b.cpp
new file mode 100644
index 000000000..c8fb75ef5
--- /dev/null
+++ b/test/profile/Inputs/instrprof-dynamic-b.cpp
@@ -0,0 +1,7 @@
+#include "instrprof-dynamic-header.h"
+void b() {
+  if (true) {
+    bar<void>();
+    bar<int>();
+  }
+}
diff --git a/test/profile/Inputs/instrprof-dynamic-header.h b/test/profile/Inputs/instrprof-dynamic-header.h
new file mode 100644
index 000000000..1dc2e37ef
--- /dev/null
+++ b/test/profile/Inputs/instrprof-dynamic-header.h
@@ -0,0 +1,5 @@
+template <class T> void bar() {
+  if (true) {}
+}
+void a();
+void b();
diff --git a/test/profile/Inputs/instrprof-dynamic-main.cpp b/test/profile/Inputs/instrprof-dynamic-main.cpp
new file mode 100644
index 000000000..0dd602139
--- /dev/null
+++ b/test/profile/Inputs/instrprof-dynamic-main.cpp
@@ -0,0 +1,9 @@
+#include "instrprof-dynamic-header.h"
+void foo(int K) { if (K) {} }
+int main(int argc, char *argv[]) {
+  foo(5);
+  bar<void>();
+  a();
+  b();
+  return 0;
+}
diff --git a/test/profile/instrprof-dynamic-one-shared.test b/test/profile/instrprof-dynamic-one-shared.test
new file mode 100644
index 000000000..38be4fe8b
--- /dev/null
+++ b/test/profile/instrprof-dynamic-one-shared.test
@@ -0,0 +1,23 @@
+RUN: mkdir -p %t.d
+RUN: %clang_profgen -o %t.d/a.shared -fPIC -shared %S/Inputs/instrprof-dynamic-a.cpp
+RUN: %clang_profgen -o %t-shared -fPIC -rpath %t.d %t.d/a.shared %S/Inputs/instrprof-dynamic-b.cpp %S/Inputs/instrprof-dynamic-main.cpp
+
+RUN: %clang_profgen -o %t-static %S/Inputs/instrprof-dynamic-a.cpp %S/Inputs/instrprof-dynamic-b.cpp %S/Inputs/instrprof-dynamic-main.cpp
+
+RUN: env LLVM_PROFILE_FILE=%t-static.profraw %run %t-static
+RUN: env LLVM_PROFILE_FILE=%t-shared.profraw %run %t-shared
+
+RUN: llvm-profdata merge -o %t-static.profdata %t-static.profraw
+RUN: llvm-profdata merge -o %t-shared.profdata %t-shared.profraw
+
+RUN: %clang_profuse=%t-static.profdata -o %t-a.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-a.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-a.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-a.cpp
+RUN: diff %t-a.static.ll %t-a.shared.ll
+
+RUN: %clang_profuse=%t-static.profdata -o %t-b.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-b.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-b.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-b.cpp
+RUN: diff %t-b.static.ll %t-b.shared.ll
+
+RUN: %clang_profuse=%t-static.profdata -o %t-main.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-main.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-main.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-main.cpp
+RUN: diff %t-main.static.ll %t-main.shared.ll
diff --git a/test/profile/instrprof-dynamic-two-shared.test b/test/profile/instrprof-dynamic-two-shared.test
new file mode 100644
index 000000000..830359dec
--- /dev/null
+++ b/test/profile/instrprof-dynamic-two-shared.test
@@ -0,0 +1,24 @@
+RUN: mkdir -p %t.d
+RUN: %clang_profgen -o %t.d/a.shared -fPIC -shared %S/Inputs/instrprof-dynamic-a.cpp
+RUN: %clang_profgen -o %t.d/b.shared -fPIC -shared %S/Inputs/instrprof-dynamic-b.cpp
+RUN: %clang_profgen -o %t-shared -fPIC -rpath %t.d %t.d/a.shared %t.d/b.shared %S/Inputs/instrprof-dynamic-main.cpp
+
+RUN: %clang_profgen -o %t-static %S/Inputs/instrprof-dynamic-a.cpp %S/Inputs/instrprof-dynamic-b.cpp %S/Inputs/instrprof-dynamic-main.cpp
+
+RUN: env LLVM_PROFILE_FILE=%t-static.profraw %run %t-static
+RUN: env LLVM_PROFILE_FILE=%t-shared.profraw %run %t-shared
+
+RUN: llvm-profdata merge -o %t-static.profdata %t-static.profraw
+RUN: llvm-profdata merge -o %t-shared.profdata %t-shared.profraw
+
+RUN: %clang_profuse=%t-static.profdata -o %t-a.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-a.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-a.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-a.cpp
+RUN: diff %t-a.static.ll %t-a.shared.ll
+
+RUN: %clang_profuse=%t-static.profdata -o %t-b.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-b.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-b.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-b.cpp
+RUN: diff %t-b.static.ll %t-b.shared.ll
+
+RUN: %clang_profuse=%t-static.profdata -o %t-main.static.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-main.cpp
+RUN: %clang_profuse=%t-shared.profdata -o %t-main.shared.ll -S -emit-llvm %S/Inputs/instrprof-dynamic-main.cpp
+RUN: diff %t-main.static.ll %t-main.shared.ll
diff --git a/test/profile/lit.cfg b/test/profile/lit.cfg
index da09f1a61..e4d510c5f 100644
--- a/test/profile/lit.cfg
+++ b/test/profile/lit.cfg
@@ -27,6 +27,9 @@ if config.test_exec_root is None:
 # Test suffixes.
 config.suffixes = ['.c', '.cc', '.cpp', '.m', '.mm', '.ll', '.test']
 
+# What to exclude.
+config.excludes = ['Inputs']
+
 # Clang flags.
 clang_cflags = [config.target_cflags]