1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
//===--------- CodeGenSYCL.cpp - Code for SYCL kernel generation ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This contains code required for generation of SYCL kernel caller offload
// entry point functions.
//
//===----------------------------------------------------------------------===//
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
using namespace clang;
using namespace CodeGen;
static void SetSYCLKernelAttributes(llvm::Function *Fn, CodeGenFunction &CGF) {
// SYCL 2020 device language restrictions require forward progress and
// disallow recursion.
Fn->setDoesNotRecurse();
if (CGF.checkIfFunctionMustProgress())
Fn->addFnAttr(llvm::Attribute::MustProgress);
}
void CodeGenModule::EmitSYCLKernelCaller(const FunctionDecl *KernelEntryPointFn,
ASTContext &Ctx) {
assert(Ctx.getLangOpts().SYCLIsDevice &&
"SYCL kernel caller offload entry point functions can only be emitted"
" during device compilation");
const auto *KernelEntryPointAttr =
KernelEntryPointFn->getAttr<SYCLKernelEntryPointAttr>();
assert(KernelEntryPointAttr && "Missing sycl_kernel_entry_point attribute");
assert(!KernelEntryPointAttr->isInvalidAttr() &&
"sycl_kernel_entry_point attribute is invalid");
// Find the SYCLKernelCallStmt.
SYCLKernelCallStmt *KernelCallStmt =
cast<SYCLKernelCallStmt>(KernelEntryPointFn->getBody());
// Retrieve the SYCL kernel caller parameters from the OutlinedFunctionDecl.
FunctionArgList Args;
const OutlinedFunctionDecl *OutlinedFnDecl =
KernelCallStmt->getOutlinedFunctionDecl();
Args.append(OutlinedFnDecl->param_begin(), OutlinedFnDecl->param_end());
// Compute the function info and LLVM function type.
const CGFunctionInfo &FnInfo =
getTypes().arrangeSYCLKernelCallerDeclaration(Ctx.VoidTy, Args);
llvm::FunctionType *FnTy = getTypes().GetFunctionType(FnInfo);
// Retrieve the generated name for the SYCL kernel caller function.
CanQualType KernelNameType =
Ctx.getCanonicalType(KernelEntryPointAttr->getKernelName());
const SYCLKernelInfo &KernelInfo = Ctx.getSYCLKernelInfo(KernelNameType);
auto *Fn = llvm::Function::Create(FnTy, llvm::Function::ExternalLinkage,
KernelInfo.GetKernelName(), &getModule());
// Emit the SYCL kernel caller function.
CodeGenFunction CGF(*this);
SetLLVMFunctionAttributes(GlobalDecl(), FnInfo, Fn, false);
SetSYCLKernelAttributes(Fn, CGF);
CGF.StartFunction(GlobalDecl(), Ctx.VoidTy, Fn, FnInfo, Args,
SourceLocation(), SourceLocation());
CGF.EmitFunctionBody(OutlinedFnDecl->getBody());
setDSOLocal(Fn);
SetLLVMFunctionAttributesForDefinition(cast<Decl>(OutlinedFnDecl), Fn);
CGF.FinishFunction();
}
|
