Reland compiler-rt support for order file instrumentation.

r355343 was landed and was reverted in r355363 due to build breakage.
This patch adds Linux/Windows support on top of r355343.

In this patch, Darwin should be working with testing case. Linux should be working,
I will enable the testing case in a follwup diff. Windows/Other should be building.
Correct implementation for Other platforms will be added.

Thanks David for reviewing the original diff, helping me with issues on Linux, and
giving suggestions for adding support for Other platforms.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355701 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 41 insertions, 0 deletions

diff --git a/test/profile/Inputs/instrprof-order-file-2.c b/test/profile/Inputs/instrprof-order-file-2.c
new file mode 100644
index 000000000..ee4485756
--- /dev/null
+++ b/test/profile/Inputs/instrprof-order-file-2.c
@@ -0,0 +1,7 @@
+__attribute__((noinline)) int f(int a) {
+  return a + 1;
+}
+
+__attribute__((noinline)) int g(int a) {
+  return a + 2;
+}
diff --git a/test/profile/Inputs/instrprof-order-file.c b/test/profile/Inputs/instrprof-order-file.c
new file mode 100644
index 000000000..9251a8e25
--- /dev/null
+++ b/test/profile/Inputs/instrprof-order-file.c
@@ -0,0 +1,17 @@
+void __llvm_profile_initialize_file(void);
+int __llvm_orderfile_dump(void);
+
+__attribute__((noinline)) int f(int a);
+
+__attribute__((noinline)) int g(int a);
+
+int main(int argc, const char *argv[]) {
+  int a = f(argc);
+  int t = 0;
+  for (int i = 0; i < argc; i++)
+    t += g(a);
+  f(t);
+  __llvm_profile_initialize_file();
+  __llvm_orderfile_dump();
+  return 0;
+}
diff --git a/test/profile/instrprof-order-file.test b/test/profile/instrprof-order-file.test
new file mode 100644
index 000000000..09e77d7f6
--- /dev/null
+++ b/test/profile/instrprof-order-file.test
@@ -0,0 +1,17 @@
+// UNSUPPORTED: windows
+// REQUIRES: darwin
+// RUN: rm -rf %t.dir && mkdir -p %t.dir
+// RUN: cd %t.dir
+//
+// RUN: %clang -forder-file-instrumentation -O1 -o %t.2 %S/Inputs/instrprof-order-file-2.c %S/Inputs/instrprof-order-file.c -mllvm -orderfile-write-mapping="mapping.txt"
+// RUN: %run %t.2 ANY
+// RUN: od -h default.profraw.order | FileCheck %s
+// RUN: cat mapping.txt | FileCheck %s --check-prefix=MAPPING
+
+// Make sure we have MD5 for main, then f, then g.
+// CHECK: 0000000      d5fa    e78d    6436    db95    a18f    dd4c    4f75    cc91
+// CHECK: 0000020      f5b2    47ff    6643    b671    0000    0000    0000    0000
+
+// MAPPING: MD5 cc914f75dd4ca18f f
+// MAPPING: MD5 b671664347fff5b2 g
+// MAPPING: MD5 db956436e78dd5fa main