[CUDA] Raise an error if a wrong-side call is codegen'ed.

Summary:
Some function calls in CUDA are allowed to appear in
semantically-correct programs but are an error if they're ever
codegen'ed.  Specifically, a host+device function may call a host
function, but it's an error if such a function is ever codegen'ed in
device mode (and vice versa).

Previously, clang made no attempt to catch these errors.  For the most
part, they would be caught by ptxas, and reported as "call to unknown
function 'foo'".

Now we catch these errors and report them the same as we report other
illegal calls (e.g. a call from a host function to a device function).

This has a small change in error-message behavior for calls that were
previously disallowed (e.g. calls from a host to a device function).
Previously, we'd catch disallowed calls fairly early, before doing
additional semantic checking e.g. of the call's arguments.  Now we catch
these illegal calls at the very end of our semantic checks, so we'll
only emit a "illegal CUDA call" error if the call is otherwise
well-formed.

Reviewers: tra, rnk

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D23242

llvm-svn: 278759

1 files changed, 0 insertions, 32 deletions

diff --git a/clang/test/CodeGenCUDA/host-device-calls-host.cu b/clang/test/CodeGenCUDA/host-device-calls-host.cu
deleted file mode 100644
index 94796a3c233..00000000000
--- a/clang/test/CodeGenCUDA/host-device-calls-host.cu
+++ /dev/null
@@ -1,32 +0,0 @@
-// RUN: %clang_cc1 %s -triple nvptx-unknown-unknown -fcuda-is-device -Wno-cuda-compat -emit-llvm -o - | FileCheck %s
-
-#include "Inputs/cuda.h"
-
-extern "C"
-void host_function() {}
-
-// CHECK-LABEL: define void @hd_function_a
-extern "C"
-__host__ __device__ void hd_function_a() {
-  // CHECK: call void @host_function
-  host_function();
-}
-
-// CHECK: declare void @host_function
-
-// CHECK-LABEL: define void @hd_function_b
-extern "C"
-__host__ __device__ void hd_function_b(bool b) { if (b) host_function(); }
-
-// CHECK-LABEL: define void @device_function_b
-extern "C"
-__device__ void device_function_b() { hd_function_b(false); }
-
-// CHECK-LABEL: define void @global_function
-extern "C"
-__global__ void global_function() {
-  // CHECK: call void @device_function_b
-  device_function_b();
-}
-
-// CHECK: !{{[0-9]+}} = !{void ()* @global_function, !"kernel", i32 1}