Add the amdgpu-kernel ABI.

Technically, there are requirements imposed by the LLVM
`AMDGPUTargetMachine` on functions with this ABI (eg, the return type
must be void), but I'm unsure exactly where this should be enforced.

Author: DiamondLovesYou

src/librustc/ich/impls_syntax.rs

@@ -114,6 +114,7 @@ impl_stable_hash_for!(enum ::rustc_target::spec::abi::Abi {
     PtxKernel,
     Msp430Interrupt,
     X86Interrupt,
+    AmdGpuKernel,
     Rust,
     C,
     System,

src/librustc_codegen_llvm/abi.rs

@@ -343,6 +343,7 @@ impl<'a, 'tcx> FnTypeExt<'a, 'tcx> for FnType<'tcx, Ty<'tcx>> {
             PtxKernel => Conv::PtxKernel,
             Msp430Interrupt => Conv::Msp430Intr,
             X86Interrupt => Conv::X86Intr,
+            AmdGpuKernel => Conv::AmdGpuKernel,
 
             // These API constants ought to be more specific...
             Cdecl => Conv::C,
@@ -608,6 +609,7 @@ impl<'a, 'tcx> FnTypeExt<'a, 'tcx> for FnType<'tcx, Ty<'tcx>> {
     fn llvm_cconv(&self) -> llvm::CallConv {
         match self.conv {
             Conv::C => llvm::CCallConv,
+            Conv::AmdGpuKernel => llvm::AmdGpuKernel,
             Conv::ArmAapcs => llvm::ArmAapcsCallConv,
             Conv::Msp430Intr => llvm::Msp430Intr,
             Conv::PtxKernel => llvm::PtxKernel,

src/librustc_llvm/ffi.rs

@@ -55,6 +55,7 @@ pub enum CallConv {
     X86_64_Win64 = 79,
     X86_VectorCall = 80,
     X86_Intr = 83,
+    AmdGpuKernel = 91,
 }
 
 /// LLVMRustLinkage

src/librustc_target/abi/call/mod.rs

@@ -436,6 +436,8 @@ pub enum Conv {
 
     X86_64SysV,
     X86_64Win64,
+
+    AmdGpuKernel,
 }
 
 /// Metadata describing how the arguments to a native function

src/librustc_target/spec/abi.rs

@@ -27,6 +27,7 @@ pub enum Abi {
     PtxKernel,
     Msp430Interrupt,
     X86Interrupt,
+    AmdGpuKernel,
 
     // Multiplatform / generic ABIs
     Rust,
@@ -63,6 +64,7 @@ const AbiDatas: &'static [AbiData] = &[
     AbiData {abi: Abi::PtxKernel, name: "ptx-kernel", generic: false },
     AbiData {abi: Abi::Msp430Interrupt, name: "msp430-interrupt", generic: false },
     AbiData {abi: Abi::X86Interrupt, name: "x86-interrupt", generic: false },
+    AbiData {abi: Abi::AmdGpuKernel, name: "amdgpu-kernel", generic: false },
 
     // Cross-platform ABIs
     AbiData {abi: Abi::Rust, name: "Rust", generic: true },

src/libsyntax/feature_gate.rs

@@ -484,6 +484,8 @@ declare_features! (
 
     // #[alloc_error_handler]
     (active, alloc_error_handler, "1.29.0", Some(51540), None),
+
+    (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
 );
 
 declare_features! (
@@ -1439,6 +1441,10 @@ impl<'a> PostExpansionVisitor<'a> {
                 gate_feature_post!(&self, abi_x86_interrupt, span,
                                    "x86-interrupt ABI is experimental and subject to change");
             },
+            Abi::AmdGpuKernel => {
+                gate_feature_post!(&self, abi_amdgpu_kernel, span,
+                                   "amdgpu-kernel ABI is experimental and subject to change");
+            },
             // Stable
             Abi::Cdecl |
             Abi::Stdcall |

src/test/ui/codemap_tests/unicode.stderr

@@ -4,7 +4,7 @@ error[E0703]: invalid ABI: found `路濫狼á́́`
 LL | extern "路濫狼á́́" fn foo() {} //~ ERROR invalid ABI
    |        ^^^^^^^^^ invalid ABI
    |
-   = help: valid ABIs: cdecl, stdcall, fastcall, vectorcall, thiscall, aapcs, win64, sysv64, ptx-kernel, msp430-interrupt, x86-interrupt, Rust, C, system, rust-intrinsic, rust-call, platform-intrinsic, unadjusted
+   = help: valid ABIs: cdecl, stdcall, fastcall, vectorcall, thiscall, aapcs, win64, sysv64, ptx-kernel, msp430-interrupt, x86-interrupt, amdgpu-kernel, Rust, C, system, rust-intrinsic, rust-call, platform-intrinsic, unadjusted
 
 error: aborting due to previous error
 

src/test/ui/feature-gate-abi.rs

@@ -7,13 +7,14 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-
+// ignore-tidy-linelength
 // gate-test-intrinsics
 // gate-test-platform_intrinsics
 // gate-test-abi_vectorcall
 // gate-test-abi_thiscall
 // gate-test-abi_ptx
 // gate-test-abi_x86_interrupt
+// gate-test-abi_amdgpu_kernel
 
 // Functions
 extern "rust-intrinsic" fn f1() {} //~ ERROR intrinsics are subject to change
@@ -24,6 +25,7 @@ extern "msp430-interrupt" fn f5() {} //~ ERROR msp430-interrupt ABI is experimen
 extern "ptx-kernel" fn f6() {} //~ ERROR PTX ABIs are experimental and subject to change
 extern "x86-interrupt" fn f7() {} //~ ERROR x86-interrupt ABI is experimental
 extern "thiscall" fn f8() {} //~ ERROR thiscall is experimental and subject to change
+extern "amdgpu-kernel" fn f9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 
 // Methods in trait definition
 trait Tr {
@@ -35,6 +37,7 @@ trait Tr {
     extern "ptx-kernel" fn m6(); //~ ERROR PTX ABIs are experimental and subject to change
     extern "x86-interrupt" fn m7(); //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn m8(); //~ ERROR thiscall is experimental and subject to change
+    extern "amdgpu-kernel" fn m9(); //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 
     extern "rust-intrinsic" fn dm1() {} //~ ERROR intrinsics are subject to change
     extern "platform-intrinsic" fn dm2() {} //~ ERROR platform intrinsics are experimental
@@ -44,6 +47,7 @@ trait Tr {
     extern "ptx-kernel" fn dm6() {} //~ ERROR PTX ABIs are experimental and subject to change
     extern "x86-interrupt" fn dm7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn dm8() {} //~ ERROR thiscall is experimental and subject to change
+    extern "amdgpu-kernel" fn dm9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 }
 
 struct S;
@@ -58,6 +62,7 @@ impl Tr for S {
     extern "ptx-kernel" fn m6() {} //~ ERROR PTX ABIs are experimental and subject to change
     extern "x86-interrupt" fn m7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn m8() {} //~ ERROR thiscall is experimental and subject to change
+    extern "amdgpu-kernel" fn m9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 }
 
 // Methods in inherent impl
@@ -70,6 +75,7 @@ impl S {
     extern "ptx-kernel" fn im6() {} //~ ERROR PTX ABIs are experimental and subject to change
     extern "x86-interrupt" fn im7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn im8() {} //~ ERROR thiscall is experimental and subject to change
+    extern "amdgpu-kernel" fn im9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 }
 
 // Function pointer types
@@ -81,6 +87,7 @@ type A5 = extern "msp430-interrupt" fn(); //~ ERROR msp430-interrupt ABI is expe
 type A6 = extern "ptx-kernel" fn (); //~ ERROR PTX ABIs are experimental and subject to change
 type A7 = extern "x86-interrupt" fn(); //~ ERROR x86-interrupt ABI is experimental
 type A8 = extern "thiscall" fn(); //~ ERROR thiscall is experimental and subject to change
+type A9 = extern "amdgpu-kernel" fn(); //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 
 // Foreign modules
 extern "rust-intrinsic" {} //~ ERROR intrinsics are subject to change
@@ -91,5 +98,6 @@ extern "msp430-interrupt" {} //~ ERROR msp430-interrupt ABI is experimental
 extern "ptx-kernel" {} //~ ERROR PTX ABIs are experimental and subject to change
 extern "x86-interrupt" {} //~ ERROR x86-interrupt ABI is experimental
 extern "thiscall" {} //~ ERROR thiscall is experimental and subject to change
+extern "amdgpu-kernel" {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
 
 fn main() {}