forked from OSchip/llvm-project
234 lines
8.4 KiB
C++
234 lines
8.4 KiB
C++
//===--- SemaStmtAttr.cpp - Statement Attribute Handling ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements stmt-related attribute processing.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/SemaInternal.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Sema/DelayedDiagnostic.h"
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#include "clang/Sema/Lookup.h"
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#include "clang/Sema/LoopHint.h"
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#include "clang/Sema/ScopeInfo.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace clang;
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using namespace sema;
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static Attr *handleFallThroughAttr(Sema &S, Stmt *St, const AttributeList &A,
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SourceRange Range) {
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if (!isa<NullStmt>(St)) {
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S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_wrong_target)
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<< St->getLocStart();
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if (isa<SwitchCase>(St)) {
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SourceLocation L = S.getLocForEndOfToken(Range.getEnd());
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S.Diag(L, diag::note_fallthrough_insert_semi_fixit)
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<< FixItHint::CreateInsertion(L, ";");
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}
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return nullptr;
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}
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if (S.getCurFunction()->SwitchStack.empty()) {
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S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_outside_switch);
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return nullptr;
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}
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return ::new (S.Context) FallThroughAttr(A.getRange(), S.Context,
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A.getAttributeSpellingListIndex());
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}
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static Attr *handleLoopHintAttr(Sema &S, Stmt *St, const AttributeList &A,
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SourceRange) {
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if (St->getStmtClass() != Stmt::DoStmtClass &&
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St->getStmtClass() != Stmt::ForStmtClass &&
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St->getStmtClass() != Stmt::CXXForRangeStmtClass &&
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St->getStmtClass() != Stmt::WhileStmtClass) {
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S.Diag(St->getLocStart(), diag::err_pragma_loop_precedes_nonloop);
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return nullptr;
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}
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IdentifierLoc *OptionLoc = A.getArgAsIdent(0);
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IdentifierInfo *OptionInfo = OptionLoc->Ident;
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IdentifierLoc *ValueLoc = A.getArgAsIdent(1);
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IdentifierInfo *ValueInfo = ValueLoc->Ident;
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Expr *ValueExpr = A.getArgAsExpr(2);
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assert(OptionInfo && "Attribute must have valid option info.");
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LoopHintAttr::OptionType Option =
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llvm::StringSwitch<LoopHintAttr::OptionType>(OptionInfo->getName())
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.Case("vectorize", LoopHintAttr::Vectorize)
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.Case("vectorize_width", LoopHintAttr::VectorizeWidth)
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.Case("interleave", LoopHintAttr::Interleave)
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.Case("interleave_count", LoopHintAttr::InterleaveCount)
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.Default(LoopHintAttr::Vectorize);
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int ValueInt;
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if (Option == LoopHintAttr::Vectorize || Option == LoopHintAttr::Interleave) {
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if (!ValueInfo) {
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S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_keyword)
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<< /*MissingKeyword=*/true << "";
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return nullptr;
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}
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if (ValueInfo->isStr("disable"))
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ValueInt = 0;
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else if (ValueInfo->isStr("enable"))
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ValueInt = 1;
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else {
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S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_keyword)
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<< /*MissingKeyword=*/false << ValueInfo;
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return nullptr;
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}
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} else if (Option == LoopHintAttr::VectorizeWidth ||
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Option == LoopHintAttr::InterleaveCount) {
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// FIXME: We should support template parameters for the loop hint value.
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// See bug report #19610.
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llvm::APSInt ValueAPS;
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if (!ValueExpr || !ValueExpr->isIntegerConstantExpr(ValueAPS, S.Context)) {
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S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_value)
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<< /*MissingValue=*/true << "";
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return nullptr;
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}
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if ((ValueInt = ValueAPS.getSExtValue()) < 1) {
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S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_value)
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<< /*MissingValue=*/false << ValueInt;
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return nullptr;
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}
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} else
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llvm_unreachable("Unknown loop hint option");
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return LoopHintAttr::CreateImplicit(S.Context, Option, ValueInt,
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A.getRange());
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}
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static void
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CheckForIncompatibleAttributes(Sema &S, SmallVectorImpl<const Attr *> &Attrs) {
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int PrevOptionValue[4] = {-1, -1, -1, -1};
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int OptionId[4] = {LoopHintAttr::Vectorize, LoopHintAttr::VectorizeWidth,
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LoopHintAttr::Interleave, LoopHintAttr::InterleaveCount};
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for (const auto *I : Attrs) {
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const LoopHintAttr *LH = dyn_cast<LoopHintAttr>(I);
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// Skip non loop hint attributes
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if (!LH)
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continue;
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int State, Value;
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int Option = LH->getOption();
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int ValueInt = LH->getValue();
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switch (Option) {
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case LoopHintAttr::Vectorize:
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case LoopHintAttr::VectorizeWidth:
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State = 0;
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Value = 1;
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break;
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case LoopHintAttr::Interleave:
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case LoopHintAttr::InterleaveCount:
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State = 2;
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Value = 3;
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break;
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}
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SourceLocation ValueLoc = LH->getRange().getEnd();
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// Compatibility testing is split into two cases.
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// 1. if the current loop hint sets state (enable/disable) - check against
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// previous state and value.
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// 2. if the current loop hint sets a value - check against previous state
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// and value.
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if (Option == State) {
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if (PrevOptionValue[State] != -1) {
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// Cannot specify state twice.
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int PrevValue = PrevOptionValue[State];
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S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
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<< /*Duplicate=*/true << LoopHintAttr::getOptionName(Option)
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<< LoopHintAttr::getValueName(PrevValue)
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<< LoopHintAttr::getOptionName(Option)
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<< LoopHintAttr::getValueName(Value);
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}
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if (PrevOptionValue[Value] != -1) {
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// Compare state with previous width/count.
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int PrevOption = OptionId[Value];
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int PrevValueInt = PrevOptionValue[Value];
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if ((ValueInt == 0 && PrevValueInt > 1) ||
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(ValueInt == 1 && PrevValueInt <= 1))
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S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
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<< /*Duplicate=*/false << LoopHintAttr::getOptionName(PrevOption)
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<< PrevValueInt << LoopHintAttr::getOptionName(Option)
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<< LoopHintAttr::getValueName(ValueInt);
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}
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} else {
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if (PrevOptionValue[State] != -1) {
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// Compare width/count value with previous state.
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int PrevOption = OptionId[State];
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int PrevValueInt = PrevOptionValue[State];
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if ((ValueInt > 1 && PrevValueInt == 0) ||
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(ValueInt <= 1 && PrevValueInt == 1))
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S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
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<< /*Duplicate=*/false << LoopHintAttr::getOptionName(PrevOption)
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<< LoopHintAttr::getValueName(PrevValueInt)
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<< LoopHintAttr::getOptionName(Option) << ValueInt;
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}
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if (PrevOptionValue[Value] != -1) {
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// Cannot specify a width/count twice.
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int PrevValueInt = PrevOptionValue[Value];
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S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
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<< /*Duplicate=*/true << LoopHintAttr::getOptionName(Option)
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<< PrevValueInt << LoopHintAttr::getOptionName(Option) << ValueInt;
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}
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}
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PrevOptionValue[Option] = ValueInt;
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}
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}
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static Attr *ProcessStmtAttribute(Sema &S, Stmt *St, const AttributeList &A,
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SourceRange Range) {
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switch (A.getKind()) {
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case AttributeList::UnknownAttribute:
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S.Diag(A.getLoc(), A.isDeclspecAttribute() ?
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diag::warn_unhandled_ms_attribute_ignored :
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diag::warn_unknown_attribute_ignored) << A.getName();
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return nullptr;
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case AttributeList::AT_FallThrough:
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return handleFallThroughAttr(S, St, A, Range);
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case AttributeList::AT_LoopHint:
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return handleLoopHintAttr(S, St, A, Range);
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default:
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// if we're here, then we parsed a known attribute, but didn't recognize
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// it as a statement attribute => it is declaration attribute
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S.Diag(A.getRange().getBegin(), diag::err_attribute_invalid_on_stmt)
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<< A.getName() << St->getLocStart();
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return nullptr;
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}
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}
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StmtResult Sema::ProcessStmtAttributes(Stmt *S, AttributeList *AttrList,
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SourceRange Range) {
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SmallVector<const Attr*, 8> Attrs;
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for (const AttributeList* l = AttrList; l; l = l->getNext()) {
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if (Attr *a = ProcessStmtAttribute(*this, S, *l, Range))
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Attrs.push_back(a);
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}
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CheckForIncompatibleAttributes(*this, Attrs);
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if (Attrs.empty())
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return S;
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return ActOnAttributedStmt(Range.getBegin(), Attrs, S);
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}
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