Add support for __gnu_mcount_nc as the pg interface

This adds support to optionally support using `__gnu_mcount_nc` as the mcount
interface rather than `mcount` for Linux and EABI.  The other targets do not
provide an implementation for `__gnu_mcount_nc`.  This can be activated via the
`-meabi gnu` flag.

Resolves PR23969.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@265888 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 6768e75941dfdf68d0963151600bdbb1ce790852..7c5c7bbe6b385820718c1a50c765bcf6b2ac42a9 100644 (file)
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -4675,6 +4675,11 @@ public:
     // that follows it, `bar', `bar' will be aligned as the  type of the
     // zero length bitfield.
     UseZeroLengthBitfieldAlignment = true;
+
+    if (Triple.getOS() == llvm::Triple::Linux ||
+        Triple.getOS() == llvm::Triple::UnknownOS)
+      this->MCountName =
+          Opts.EABIVersion == "gnu" ? "\01__gnu_mcount_nc" : "\01mcount";
   }
 
   StringRef getABI() const override { return ABI; }
@@ -5423,9 +5428,8 @@ class AArch64TargetInfo : public TargetInfo {
   std::string ABI;
 
 public:
-  AArch64TargetInfo(const llvm::Triple &Triple, const TargetOptions &)
+  AArch64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
       : TargetInfo(Triple), ABI("aapcs") {
-
     if (getTriple().getOS() == llvm::Triple::NetBSD) {
       WCharType = SignedInt;
 
@@ -5460,6 +5464,11 @@ public:
 
     // AArch64 targets default to using the ARM C++ ABI.
     TheCXXABI.set(TargetCXXABI::GenericAArch64);
+
+    if (Triple.getOS() == llvm::Triple::Linux ||
+        Triple.getOS() == llvm::Triple::UnknownOS)
+      this->MCountName =
+          Opts.EABIVersion == "gnu" ? "\01__gnu_mcount_nc" : "\01mcount";
   }
 
   StringRef getABI() const override { return ABI; }

diff --git a/test/Frontend/gnu-mcount.c b/test/Frontend/gnu-mcount.c
new file mode 100644 (file)
index 0000000..059b8d1
--- /dev/null
+++ b/test/Frontend/gnu-mcount.c
@@ -0,0 +1,44 @@
+// RUN: %clang -target armv7-unknown-none-eabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
+// RUN: %clang -target armv7-unknown-none-eabi -pg -meabi gnu -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
+// RUN: %clang -target armv7-unknown-linux-gnueabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
+// RUN: %clang -target armv7-unknown-linux-gnueabi -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
+// RUN: %clang -target armv7-unknown-linux-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
+// RUN: %clang -target armv7-unknown-linux-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
+// RUN: %clang -target armv7-unknown-freebsd-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-FREEBSD
+// RUN: %clang -target armv7-unknown-freebsd-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-FREEBSD
+// RUN: %clang -target armv7-unknown-openbsd-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-OPENBSD
+// RUN: %clang -target armv7-unknown-openbsd-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-OPENBSD
+// RUN: %clang -target armv7-unknown-netbsd-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-NETBSD
+// RUN: %clang -target armv7-unknown-netbsd-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-NETBSD
+// RUN: %clang -target armv7-apple-ios -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-IOS
+// RUN: %clang -target armv7-apple-ios -pg -meabi gnu -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-IOS
+// RUN: %clang -target armv7-unknown-bitrig-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-BIGRIG
+// RUN: %clang -target armv7-unknown-bitrig-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-BIGRIG
+// RUN: %clang -target armv7-unknown-rtems-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-RTEMS
+// RUN: %clang -target armv7-unknown-rtems-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-RTEMS
+// RUN: %clang -target armv7-unknown-cloudabi-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-CLOUDABI
+// RUN: %clang -target armv7-unknown-cloudabi-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-CLOUDABI
+
+int f() {
+  return 0;
+}
+
+// CHECK-LABEL: f
+// CHECK-ARM-IOS-NOT: call void @_mcount()
+// CHECK-ARM-IOS-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI: call void @"\01mcount"()
+// CHECK-ARM-EABI-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-FREEBSD: call void @__mcount()
+// CHECK-ARM-EABI-FREEBSD-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-NETBSD: call void @_mcount()
+// CHECK-ARM-EABI-NETBSD-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-OPENBSD: call void @__mcount()
+// CHECK-ARM-EABI-OPENBSD-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-MEABI-GNU-NOT: call void @mcount()
+// CHECK-ARM-EABI-MEABI-GNU: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-BITRIG: call void @__mcount()
+// CHECK-ARM-EABI-BITRIG-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-RTEMS: call void @mcount()
+// CHECK-ARM-EABI-RTEMS-NOT: call void @"\01__gnu_mcount_nc"()
+// CHECK-ARM-EABI-CLOUDABI: call void @mcount()
+// CHECK-ARM-EABI-CLOUDABI-NOT: call void @"\01__gnu_mcount_nc"()