ARM, AArch64: support `__attribute__((__swiftcall__))`

Support the Swift calling convention on Windows ARM and AArch64.  Both
of these conform to the AAPCS, AAPCS64 calling convention, and LLVM has
been adjusted to account for the register usage.  Ensure that the
frontend passes this into the backend.  This allows the swift runtime to
be built for Windows.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@348454 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Basic/Targets/AArch64.cpp b/lib/Basic/Targets/AArch64.cpp
index e64eb21a49f911950fb3e581dcd87787d22b151d..376cba6e45516e13e4aa6ea719e6a635e14266cb 100644 (file)
--- a/lib/Basic/Targets/AArch64.cpp
+++ b/lib/Basic/Targets/AArch64.cpp
@@ -514,6 +514,7 @@ WindowsARM64TargetInfo::checkCallingConvention(CallingConv CC) const {
   case CC_OpenCLKernel:
   case CC_PreserveMost:
   case CC_PreserveAll:
+  case CC_Swift:
   case CC_Win64:
     return CCCR_OK;
   default:

diff --git a/lib/Basic/Targets/ARM.cpp b/lib/Basic/Targets/ARM.cpp
index 5345d1f8e9de5b968069c5e2236e953249b27512..cb202eac98588f11bbc5a95112ceba1796ab22ea 100644 (file)
--- a/lib/Basic/Targets/ARM.cpp
+++ b/lib/Basic/Targets/ARM.cpp
@@ -996,6 +996,7 @@ WindowsARMTargetInfo::checkCallingConvention(CallingConv CC) const {
   case CC_OpenCLKernel:
   case CC_PreserveMost:
   case CC_PreserveAll:
+  case CC_Swift:
     return CCCR_OK;
   default:
     return CCCR_Warning;

diff --git a/test/CodeGen/swift-call-conv.c b/test/CodeGen/swift-call-conv.c
new file mode 100644 (file)
index 0000000..31d70b3
--- /dev/null
+++ b/test/CodeGen/swift-call-conv.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple aarch64-unknown-windows-msvc -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple thumbv7-unknown-windows-msvc -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -emit-llvm %s -o - | FileCheck %s
+
+// REQUIRES: aarch64-registered-target,arm-registered-target,x86-registered-target
+
+void __attribute__((__swiftcall__)) f(void) {}
+// CHECK-LABEL: define dso_local swiftcc void @f()
+

diff --git a/test/Sema/swift-call-conv.c b/test/Sema/swift-call-conv.c
new file mode 100644 (file)
index 0000000..755c18f
--- /dev/null
+++ b/test/Sema/swift-call-conv.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple aarch64-unknown-windows-msvc -fsyntax-only %s -verify
+// RUN: %clang_cc1 -triple thumbv7-unknown-windows-msvc -fsyntax-only %s -verify
+// RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -fsyntax-only %s -verify
+
+// expected-no-diagnostics
+
+void __attribute__((__swiftcall__)) f(void) {}