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//===- SemaSYCL.cpp - Semantic Analysis for SYCL constructs ---------------===//
//
// 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 implements Semantic Analysis for SYCL constructs.
//===----------------------------------------------------------------------===//
#include "clang/AST/Mangle.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/SemaDiagnostic.h"
using namespace clang;
// -----------------------------------------------------------------------------
// SYCL device specific diagnostics implementation
// -----------------------------------------------------------------------------
Sema::SemaDiagnosticBuilder Sema::SYCLDiagIfDeviceCode(SourceLocation Loc,
unsigned DiagID) {
assert(getLangOpts().SYCLIsDevice &&
"Should only be called during SYCL compilation");
FunctionDecl *FD = dyn_cast<FunctionDecl>(getCurLexicalContext());
SemaDiagnosticBuilder::Kind DiagKind = [this, FD] {
if (!FD)
return SemaDiagnosticBuilder::K_Nop;
if (getEmissionStatus(FD) == Sema::FunctionEmissionStatus::Emitted)
return SemaDiagnosticBuilder::K_ImmediateWithCallStack;
return SemaDiagnosticBuilder::K_Deferred;
}();
return SemaDiagnosticBuilder(DiagKind, Loc, DiagID, FD, *this);
}
bool Sema::checkSYCLDeviceFunction(SourceLocation Loc, FunctionDecl *Callee) {
assert(getLangOpts().SYCLIsDevice &&
"Should only be called during SYCL compilation");
assert(Callee && "Callee may not be null.");
// Errors in an unevaluated context don't need to be generated,
// so we can safely skip them.
if (isUnevaluatedContext() || isConstantEvaluated())
return true;
SemaDiagnosticBuilder::Kind DiagKind = SemaDiagnosticBuilder::K_Nop;
return DiagKind != SemaDiagnosticBuilder::K_Immediate &&
DiagKind != SemaDiagnosticBuilder::K_ImmediateWithCallStack;
}
static bool isZeroSizedArray(Sema &SemaRef, QualType Ty) {
if (const auto *CAT = SemaRef.getASTContext().getAsConstantArrayType(Ty))
return CAT->getSize() == 0;
return false;
}
void Sema::deepTypeCheckForSYCLDevice(SourceLocation UsedAt,
llvm::DenseSet<QualType> Visited,
ValueDecl *DeclToCheck) {
assert(getLangOpts().SYCLIsDevice &&
"Should only be called during SYCL compilation");
// Emit notes only for the first discovered declaration of unsupported type
// to avoid mess of notes. This flag is to track that error already happened.
bool NeedToEmitNotes = true;
auto Check = [&](QualType TypeToCheck, const ValueDecl *D) {
bool ErrorFound = false;
if (isZeroSizedArray(*this, TypeToCheck)) {
SYCLDiagIfDeviceCode(UsedAt, diag::err_typecheck_zero_array_size) << 1;
ErrorFound = true;
}
// Checks for other types can also be done here.
if (ErrorFound) {
if (NeedToEmitNotes) {
if (auto *FD = dyn_cast<FieldDecl>(D))
SYCLDiagIfDeviceCode(FD->getLocation(),
diag::note_illegal_field_declared_here)
<< FD->getType()->isPointerType() << FD->getType();
else
SYCLDiagIfDeviceCode(D->getLocation(), diag::note_declared_at);
}
}
return ErrorFound;
};
// In case we have a Record used do the DFS for a bad field.
SmallVector<const ValueDecl *, 4> StackForRecursion;
StackForRecursion.push_back(DeclToCheck);
// While doing DFS save how we get there to emit a nice set of notes.
SmallVector<const FieldDecl *, 4> History;
History.push_back(nullptr);
do {
const ValueDecl *Next = StackForRecursion.pop_back_val();
if (!Next) {
assert(!History.empty());
// Found a marker, we have gone up a level.
History.pop_back();
continue;
}
QualType NextTy = Next->getType();
if (!Visited.insert(NextTy).second)
continue;
auto EmitHistory = [&]() {
// The first element is always nullptr.
for (uint64_t Index = 1; Index < History.size(); ++Index) {
SYCLDiagIfDeviceCode(History[Index]->getLocation(),
diag::note_within_field_of_type)
<< History[Index]->getType();
}
};
if (Check(NextTy, Next)) {
if (NeedToEmitNotes)
EmitHistory();
NeedToEmitNotes = false;
}
// In case pointer/array/reference type is met get pointee type, then
// proceed with that type.
while (NextTy->isAnyPointerType() || NextTy->isArrayType() ||
NextTy->isReferenceType()) {
if (NextTy->isArrayType())
NextTy = QualType{NextTy->getArrayElementTypeNoTypeQual(), 0};
else
NextTy = NextTy->getPointeeType();
if (Check(NextTy, Next)) {
if (NeedToEmitNotes)
EmitHistory();
NeedToEmitNotes = false;
}
}
if (const auto *RecDecl = NextTy->getAsRecordDecl()) {
if (auto *NextFD = dyn_cast<FieldDecl>(Next))
History.push_back(NextFD);
// When nullptr is discovered, this means we've gone back up a level, so
// the history should be cleaned.
StackForRecursion.push_back(nullptr);
llvm::copy(RecDecl->fields(), std::back_inserter(StackForRecursion));
}
} while (!StackForRecursion.empty());
}
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