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llvm-project/clang/lib/Parse/ParsePragma.cpp

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//===--- ParsePragma.cpp - Language specific pragma parsing ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the language specific #pragma handlers.
//
//===----------------------------------------------------------------------===//
#include "RAIIObjectsForParser.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/Parser.h"
#include "clang/Sema/LoopHint.h"
#include "clang/Sema/Scope.h"
#include "llvm/ADT/StringSwitch.h"
using namespace clang;
namespace {
struct PragmaAlignHandler : public PragmaHandler {
explicit PragmaAlignHandler() : PragmaHandler("align") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaGCCVisibilityHandler : public PragmaHandler {
explicit PragmaGCCVisibilityHandler() : PragmaHandler("visibility") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaOptionsHandler : public PragmaHandler {
explicit PragmaOptionsHandler() : PragmaHandler("options") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaPackHandler : public PragmaHandler {
explicit PragmaPackHandler() : PragmaHandler("pack") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaMSStructHandler : public PragmaHandler {
explicit PragmaMSStructHandler() : PragmaHandler("ms_struct") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaUnusedHandler : public PragmaHandler {
PragmaUnusedHandler() : PragmaHandler("unused") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaWeakHandler : public PragmaHandler {
explicit PragmaWeakHandler() : PragmaHandler("weak") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaRedefineExtnameHandler : public PragmaHandler {
explicit PragmaRedefineExtnameHandler() : PragmaHandler("redefine_extname") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaOpenCLExtensionHandler : public PragmaHandler {
PragmaOpenCLExtensionHandler() : PragmaHandler("EXTENSION") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaFPContractHandler : public PragmaHandler {
PragmaFPContractHandler() : PragmaHandler("FP_CONTRACT") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaNoOpenMPHandler : public PragmaHandler {
PragmaNoOpenMPHandler() : PragmaHandler("omp") { }
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaOpenMPHandler : public PragmaHandler {
PragmaOpenMPHandler() : PragmaHandler("omp") { }
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
/// PragmaCommentHandler - "\#pragma comment ...".
struct PragmaCommentHandler : public PragmaHandler {
PragmaCommentHandler(Sema &Actions)
: PragmaHandler("comment"), Actions(Actions) {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
private:
Sema &Actions;
};
struct PragmaDetectMismatchHandler : public PragmaHandler {
PragmaDetectMismatchHandler(Sema &Actions)
: PragmaHandler("detect_mismatch"), Actions(Actions) {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
private:
Sema &Actions;
};
struct PragmaMSPointersToMembers : public PragmaHandler {
explicit PragmaMSPointersToMembers() : PragmaHandler("pointers_to_members") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaMSVtorDisp : public PragmaHandler {
explicit PragmaMSVtorDisp() : PragmaHandler("vtordisp") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaMSPragma : public PragmaHandler {
explicit PragmaMSPragma(const char *name) : PragmaHandler(name) {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
/// PragmaOptimizeHandler - "\#pragma clang optimize on/off".
struct PragmaOptimizeHandler : public PragmaHandler {
PragmaOptimizeHandler(Sema &S)
: PragmaHandler("optimize"), Actions(S) {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
private:
Sema &Actions;
};
struct PragmaLoopHintHandler : public PragmaHandler {
PragmaLoopHintHandler() : PragmaHandler("loop") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaUnrollHintHandler : public PragmaHandler {
PragmaUnrollHintHandler(const char *name) : PragmaHandler(name) {}
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &FirstToken) override;
};
struct PragmaMSRuntimeChecksHandler : public EmptyPragmaHandler {
PragmaMSRuntimeChecksHandler() : EmptyPragmaHandler("runtime_checks") {}
};
} // end namespace
void Parser::initializePragmaHandlers() {
AlignHandler.reset(new PragmaAlignHandler());
PP.AddPragmaHandler(AlignHandler.get());
GCCVisibilityHandler.reset(new PragmaGCCVisibilityHandler());
PP.AddPragmaHandler("GCC", GCCVisibilityHandler.get());
OptionsHandler.reset(new PragmaOptionsHandler());
PP.AddPragmaHandler(OptionsHandler.get());
PackHandler.reset(new PragmaPackHandler());
PP.AddPragmaHandler(PackHandler.get());
MSStructHandler.reset(new PragmaMSStructHandler());
PP.AddPragmaHandler(MSStructHandler.get());
UnusedHandler.reset(new PragmaUnusedHandler());
PP.AddPragmaHandler(UnusedHandler.get());
WeakHandler.reset(new PragmaWeakHandler());
PP.AddPragmaHandler(WeakHandler.get());
RedefineExtnameHandler.reset(new PragmaRedefineExtnameHandler());
PP.AddPragmaHandler(RedefineExtnameHandler.get());
FPContractHandler.reset(new PragmaFPContractHandler());
PP.AddPragmaHandler("STDC", FPContractHandler.get());
if (getLangOpts().OpenCL) {
OpenCLExtensionHandler.reset(new PragmaOpenCLExtensionHandler());
PP.AddPragmaHandler("OPENCL", OpenCLExtensionHandler.get());
PP.AddPragmaHandler("OPENCL", FPContractHandler.get());
}
if (getLangOpts().OpenMP)
OpenMPHandler.reset(new PragmaOpenMPHandler());
else
OpenMPHandler.reset(new PragmaNoOpenMPHandler());
PP.AddPragmaHandler(OpenMPHandler.get());
if (getLangOpts().MicrosoftExt || getTargetInfo().getTriple().isPS4()) {
MSCommentHandler.reset(new PragmaCommentHandler(Actions));
PP.AddPragmaHandler(MSCommentHandler.get());
}
if (getLangOpts().MicrosoftExt) {
MSDetectMismatchHandler.reset(new PragmaDetectMismatchHandler(Actions));
PP.AddPragmaHandler(MSDetectMismatchHandler.get());
MSPointersToMembers.reset(new PragmaMSPointersToMembers());
PP.AddPragmaHandler(MSPointersToMembers.get());
MSVtorDisp.reset(new PragmaMSVtorDisp());
PP.AddPragmaHandler(MSVtorDisp.get());
MSInitSeg.reset(new PragmaMSPragma("init_seg"));
PP.AddPragmaHandler(MSInitSeg.get());
MSDataSeg.reset(new PragmaMSPragma("data_seg"));
PP.AddPragmaHandler(MSDataSeg.get());
MSBSSSeg.reset(new PragmaMSPragma("bss_seg"));
PP.AddPragmaHandler(MSBSSSeg.get());
MSConstSeg.reset(new PragmaMSPragma("const_seg"));
PP.AddPragmaHandler(MSConstSeg.get());
MSCodeSeg.reset(new PragmaMSPragma("code_seg"));
PP.AddPragmaHandler(MSCodeSeg.get());
MSSection.reset(new PragmaMSPragma("section"));
PP.AddPragmaHandler(MSSection.get());
MSRuntimeChecks.reset(new PragmaMSRuntimeChecksHandler());
PP.AddPragmaHandler(MSRuntimeChecks.get());
}
OptimizeHandler.reset(new PragmaOptimizeHandler(Actions));
PP.AddPragmaHandler("clang", OptimizeHandler.get());
LoopHintHandler.reset(new PragmaLoopHintHandler());
PP.AddPragmaHandler("clang", LoopHintHandler.get());
UnrollHintHandler.reset(new PragmaUnrollHintHandler("unroll"));
PP.AddPragmaHandler(UnrollHintHandler.get());
NoUnrollHintHandler.reset(new PragmaUnrollHintHandler("nounroll"));
PP.AddPragmaHandler(NoUnrollHintHandler.get());
}
void Parser::resetPragmaHandlers() {
// Remove the pragma handlers we installed.
PP.RemovePragmaHandler(AlignHandler.get());
AlignHandler.reset();
PP.RemovePragmaHandler("GCC", GCCVisibilityHandler.get());
GCCVisibilityHandler.reset();
PP.RemovePragmaHandler(OptionsHandler.get());
OptionsHandler.reset();
PP.RemovePragmaHandler(PackHandler.get());
PackHandler.reset();
PP.RemovePragmaHandler(MSStructHandler.get());
MSStructHandler.reset();
PP.RemovePragmaHandler(UnusedHandler.get());
UnusedHandler.reset();
PP.RemovePragmaHandler(WeakHandler.get());
WeakHandler.reset();
PP.RemovePragmaHandler(RedefineExtnameHandler.get());
RedefineExtnameHandler.reset();
if (getLangOpts().OpenCL) {
PP.RemovePragmaHandler("OPENCL", OpenCLExtensionHandler.get());
OpenCLExtensionHandler.reset();
PP.RemovePragmaHandler("OPENCL", FPContractHandler.get());
}
PP.RemovePragmaHandler(OpenMPHandler.get());
OpenMPHandler.reset();
if (getLangOpts().MicrosoftExt || getTargetInfo().getTriple().isPS4()) {
PP.RemovePragmaHandler(MSCommentHandler.get());
MSCommentHandler.reset();
}
if (getLangOpts().MicrosoftExt) {
PP.RemovePragmaHandler(MSDetectMismatchHandler.get());
MSDetectMismatchHandler.reset();
PP.RemovePragmaHandler(MSPointersToMembers.get());
MSPointersToMembers.reset();
PP.RemovePragmaHandler(MSVtorDisp.get());
MSVtorDisp.reset();
PP.RemovePragmaHandler(MSInitSeg.get());
MSInitSeg.reset();
PP.RemovePragmaHandler(MSDataSeg.get());
MSDataSeg.reset();
PP.RemovePragmaHandler(MSBSSSeg.get());
MSBSSSeg.reset();
PP.RemovePragmaHandler(MSConstSeg.get());
MSConstSeg.reset();
PP.RemovePragmaHandler(MSCodeSeg.get());
MSCodeSeg.reset();
PP.RemovePragmaHandler(MSSection.get());
MSSection.reset();
PP.RemovePragmaHandler(MSRuntimeChecks.get());
MSRuntimeChecks.reset();
}
PP.RemovePragmaHandler("STDC", FPContractHandler.get());
FPContractHandler.reset();
PP.RemovePragmaHandler("clang", OptimizeHandler.get());
OptimizeHandler.reset();
PP.RemovePragmaHandler("clang", LoopHintHandler.get());
LoopHintHandler.reset();
PP.RemovePragmaHandler(UnrollHintHandler.get());
UnrollHintHandler.reset();
PP.RemovePragmaHandler(NoUnrollHintHandler.get());
NoUnrollHintHandler.reset();
}
/// \brief Handle the annotation token produced for #pragma unused(...)
///
/// Each annot_pragma_unused is followed by the argument token so e.g.
/// "#pragma unused(x,y)" becomes:
/// annot_pragma_unused 'x' annot_pragma_unused 'y'
void Parser::HandlePragmaUnused() {
assert(Tok.is(tok::annot_pragma_unused));
SourceLocation UnusedLoc = ConsumeToken();
Actions.ActOnPragmaUnused(Tok, getCurScope(), UnusedLoc);
ConsumeToken(); // The argument token.
}
void Parser::HandlePragmaVisibility() {
assert(Tok.is(tok::annot_pragma_vis));
const IdentifierInfo *VisType =
static_cast<IdentifierInfo *>(Tok.getAnnotationValue());
SourceLocation VisLoc = ConsumeToken();
Actions.ActOnPragmaVisibility(VisType, VisLoc);
}
namespace {
struct PragmaPackInfo {
Sema::PragmaPackKind Kind;
IdentifierInfo *Name;
Token Alignment;
SourceLocation LParenLoc;
SourceLocation RParenLoc;
};
} // end anonymous namespace
void Parser::HandlePragmaPack() {
assert(Tok.is(tok::annot_pragma_pack));
PragmaPackInfo *Info =
static_cast<PragmaPackInfo *>(Tok.getAnnotationValue());
SourceLocation PragmaLoc = ConsumeToken();
ExprResult Alignment;
if (Info->Alignment.is(tok::numeric_constant)) {
Alignment = Actions.ActOnNumericConstant(Info->Alignment);
if (Alignment.isInvalid())
return;
}
Actions.ActOnPragmaPack(Info->Kind, Info->Name, Alignment.get(), PragmaLoc,
Info->LParenLoc, Info->RParenLoc);
}
void Parser::HandlePragmaMSStruct() {
assert(Tok.is(tok::annot_pragma_msstruct));
Sema::PragmaMSStructKind Kind =
static_cast<Sema::PragmaMSStructKind>(
reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
Actions.ActOnPragmaMSStruct(Kind);
ConsumeToken(); // The annotation token.
}
void Parser::HandlePragmaAlign() {
assert(Tok.is(tok::annot_pragma_align));
Sema::PragmaOptionsAlignKind Kind =
static_cast<Sema::PragmaOptionsAlignKind>(
reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
SourceLocation PragmaLoc = ConsumeToken();
Actions.ActOnPragmaOptionsAlign(Kind, PragmaLoc);
}
void Parser::HandlePragmaWeak() {
assert(Tok.is(tok::annot_pragma_weak));
SourceLocation PragmaLoc = ConsumeToken();
Actions.ActOnPragmaWeakID(Tok.getIdentifierInfo(), PragmaLoc,
Tok.getLocation());
ConsumeToken(); // The weak name.
}
void Parser::HandlePragmaWeakAlias() {
assert(Tok.is(tok::annot_pragma_weakalias));
SourceLocation PragmaLoc = ConsumeToken();
IdentifierInfo *WeakName = Tok.getIdentifierInfo();
SourceLocation WeakNameLoc = Tok.getLocation();
ConsumeToken();
IdentifierInfo *AliasName = Tok.getIdentifierInfo();
SourceLocation AliasNameLoc = Tok.getLocation();
ConsumeToken();
Actions.ActOnPragmaWeakAlias(WeakName, AliasName, PragmaLoc,
WeakNameLoc, AliasNameLoc);
}
void Parser::HandlePragmaRedefineExtname() {
assert(Tok.is(tok::annot_pragma_redefine_extname));
SourceLocation RedefLoc = ConsumeToken();
IdentifierInfo *RedefName = Tok.getIdentifierInfo();
SourceLocation RedefNameLoc = Tok.getLocation();
ConsumeToken();
IdentifierInfo *AliasName = Tok.getIdentifierInfo();
SourceLocation AliasNameLoc = Tok.getLocation();
ConsumeToken();
Actions.ActOnPragmaRedefineExtname(RedefName, AliasName, RedefLoc,
RedefNameLoc, AliasNameLoc);
}
void Parser::HandlePragmaFPContract() {
assert(Tok.is(tok::annot_pragma_fp_contract));
tok::OnOffSwitch OOS =
static_cast<tok::OnOffSwitch>(
reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
Actions.ActOnPragmaFPContract(OOS);
ConsumeToken(); // The annotation token.
}
StmtResult Parser::HandlePragmaCaptured()
{
assert(Tok.is(tok::annot_pragma_captured));
ConsumeToken();
if (Tok.isNot(tok::l_brace)) {
PP.Diag(Tok, diag::err_expected) << tok::l_brace;
return StmtError();
}
SourceLocation Loc = Tok.getLocation();
ParseScope CapturedRegionScope(this, Scope::FnScope | Scope::DeclScope);
Actions.ActOnCapturedRegionStart(Loc, getCurScope(), CR_Default,
/*NumParams=*/1);
StmtResult R = ParseCompoundStatement();
CapturedRegionScope.Exit();
if (R.isInvalid()) {
Actions.ActOnCapturedRegionError();
return StmtError();
}
return Actions.ActOnCapturedRegionEnd(R.get());
}
namespace {
typedef llvm::PointerIntPair<IdentifierInfo *, 1, bool> OpenCLExtData;
}
void Parser::HandlePragmaOpenCLExtension() {
assert(Tok.is(tok::annot_pragma_opencl_extension));
OpenCLExtData data =
OpenCLExtData::getFromOpaqueValue(Tok.getAnnotationValue());
unsigned state = data.getInt();
IdentifierInfo *ename = data.getPointer();
SourceLocation NameLoc = Tok.getLocation();
ConsumeToken(); // The annotation token.
OpenCLOptions &f = Actions.getOpenCLOptions();
// OpenCL 1.1 9.1: "The all variant sets the behavior for all extensions,
// overriding all previously issued extension directives, but only if the
// behavior is set to disable."
if (state == 0 && ename->isStr("all")) {
#define OPENCLEXT(nm) f.nm = 0;
#include "clang/Basic/OpenCLExtensions.def"
}
#define OPENCLEXT(nm) else if (ename->isStr(#nm)) { f.nm = state; }
#include "clang/Basic/OpenCLExtensions.def"
else {
PP.Diag(NameLoc, diag::warn_pragma_unknown_extension) << ename;
return;
}
}
void Parser::HandlePragmaMSPointersToMembers() {
assert(Tok.is(tok::annot_pragma_ms_pointers_to_members));
LangOptions::PragmaMSPointersToMembersKind RepresentationMethod =
static_cast<LangOptions::PragmaMSPointersToMembersKind>(
reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
SourceLocation PragmaLoc = ConsumeToken(); // The annotation token.
Actions.ActOnPragmaMSPointersToMembers(RepresentationMethod, PragmaLoc);
}
void Parser::HandlePragmaMSVtorDisp() {
assert(Tok.is(tok::annot_pragma_ms_vtordisp));
uintptr_t Value = reinterpret_cast<uintptr_t>(Tok.getAnnotationValue());
Sema::PragmaVtorDispKind Kind =
static_cast<Sema::PragmaVtorDispKind>((Value >> 16) & 0xFFFF);
MSVtorDispAttr::Mode Mode = MSVtorDispAttr::Mode(Value & 0xFFFF);
SourceLocation PragmaLoc = ConsumeToken(); // The annotation token.
Actions.ActOnPragmaMSVtorDisp(Kind, PragmaLoc, Mode);
}
void Parser::HandlePragmaMSPragma() {
assert(Tok.is(tok::annot_pragma_ms_pragma));
// Grab the tokens out of the annotation and enter them into the stream.
auto TheTokens = (std::pair<Token*, size_t> *)Tok.getAnnotationValue();
PP.EnterTokenStream(TheTokens->first, TheTokens->second, true, true);
SourceLocation PragmaLocation = ConsumeToken(); // The annotation token.
assert(Tok.isAnyIdentifier());
StringRef PragmaName = Tok.getIdentifierInfo()->getName();
PP.Lex(Tok); // pragma kind
// Figure out which #pragma we're dealing with. The switch has no default
// because lex shouldn't emit the annotation token for unrecognized pragmas.
typedef bool (Parser::*PragmaHandler)(StringRef, SourceLocation);
PragmaHandler Handler = llvm::StringSwitch<PragmaHandler>(PragmaName)
.Case("data_seg", &Parser::HandlePragmaMSSegment)
.Case("bss_seg", &Parser::HandlePragmaMSSegment)
.Case("const_seg", &Parser::HandlePragmaMSSegment)
.Case("code_seg", &Parser::HandlePragmaMSSegment)
.Case("section", &Parser::HandlePragmaMSSection)
.Case("init_seg", &Parser::HandlePragmaMSInitSeg);
if (!(this->*Handler)(PragmaName, PragmaLocation)) {
// Pragma handling failed, and has been diagnosed. Slurp up the tokens
// until eof (really end of line) to prevent follow-on errors.
while (Tok.isNot(tok::eof))
PP.Lex(Tok);
PP.Lex(Tok);
}
}
bool Parser::HandlePragmaMSSection(StringRef PragmaName,
SourceLocation PragmaLocation) {
if (Tok.isNot(tok::l_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_lparen) << PragmaName;
return false;
}
PP.Lex(Tok); // (
// Parsing code for pragma section
if (Tok.isNot(tok::string_literal)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_section_name)
<< PragmaName;
return false;
}
ExprResult StringResult = ParseStringLiteralExpression();
if (StringResult.isInvalid())
return false; // Already diagnosed.
StringLiteral *SegmentName = cast<StringLiteral>(StringResult.get());
if (SegmentName->getCharByteWidth() != 1) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_non_wide_string)
<< PragmaName;
return false;
}
int SectionFlags = ASTContext::PSF_Read;
bool SectionFlagsAreDefault = true;
while (Tok.is(tok::comma)) {
PP.Lex(Tok); // ,
// Ignore "long" and "short".
// They are undocumented, but widely used, section attributes which appear
// to do nothing.
if (Tok.is(tok::kw_long) || Tok.is(tok::kw_short)) {
PP.Lex(Tok); // long/short
continue;
}
if (!Tok.isAnyIdentifier()) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_action_or_r_paren)
<< PragmaName;
return false;
}
ASTContext::PragmaSectionFlag Flag =
llvm::StringSwitch<ASTContext::PragmaSectionFlag>(
Tok.getIdentifierInfo()->getName())
.Case("read", ASTContext::PSF_Read)
.Case("write", ASTContext::PSF_Write)
.Case("execute", ASTContext::PSF_Execute)
.Case("shared", ASTContext::PSF_Invalid)
.Case("nopage", ASTContext::PSF_Invalid)
.Case("nocache", ASTContext::PSF_Invalid)
.Case("discard", ASTContext::PSF_Invalid)
.Case("remove", ASTContext::PSF_Invalid)
.Default(ASTContext::PSF_None);
if (Flag == ASTContext::PSF_None || Flag == ASTContext::PSF_Invalid) {
PP.Diag(PragmaLocation, Flag == ASTContext::PSF_None
? diag::warn_pragma_invalid_specific_action
: diag::warn_pragma_unsupported_action)
<< PragmaName << Tok.getIdentifierInfo()->getName();
return false;
}
SectionFlags |= Flag;
SectionFlagsAreDefault = false;
PP.Lex(Tok); // Identifier
}
// If no section attributes are specified, the section will be marked as
// read/write.
if (SectionFlagsAreDefault)
SectionFlags |= ASTContext::PSF_Write;
if (Tok.isNot(tok::r_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_rparen) << PragmaName;
return false;
}
PP.Lex(Tok); // )
if (Tok.isNot(tok::eof)) {
PP.Diag(PragmaLocation, diag::warn_pragma_extra_tokens_at_eol)
<< PragmaName;
return false;
}
PP.Lex(Tok); // eof
Actions.ActOnPragmaMSSection(PragmaLocation, SectionFlags, SegmentName);
return true;
}
bool Parser::HandlePragmaMSSegment(StringRef PragmaName,
SourceLocation PragmaLocation) {
if (Tok.isNot(tok::l_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_lparen) << PragmaName;
return false;
}
PP.Lex(Tok); // (
Sema::PragmaMsStackAction Action = Sema::PSK_Reset;
StringRef SlotLabel;
if (Tok.isAnyIdentifier()) {
StringRef PushPop = Tok.getIdentifierInfo()->getName();
if (PushPop == "push")
Action = Sema::PSK_Push;
else if (PushPop == "pop")
Action = Sema::PSK_Pop;
else {
PP.Diag(PragmaLocation,
diag::warn_pragma_expected_section_push_pop_or_name)
<< PragmaName;
return false;
}
if (Action != Sema::PSK_Reset) {
PP.Lex(Tok); // push | pop
if (Tok.is(tok::comma)) {
PP.Lex(Tok); // ,
// If we've got a comma, we either need a label or a string.
if (Tok.isAnyIdentifier()) {
SlotLabel = Tok.getIdentifierInfo()->getName();
PP.Lex(Tok); // identifier
if (Tok.is(tok::comma))
PP.Lex(Tok);
else if (Tok.isNot(tok::r_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_punc)
<< PragmaName;
return false;
}
}
} else if (Tok.isNot(tok::r_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_punc) << PragmaName;
return false;
}
}
}
// Grab the string literal for our section name.
StringLiteral *SegmentName = nullptr;
if (Tok.isNot(tok::r_paren)) {
if (Tok.isNot(tok::string_literal)) {
unsigned DiagID = Action != Sema::PSK_Reset ? !SlotLabel.empty() ?
diag::warn_pragma_expected_section_name :
diag::warn_pragma_expected_section_label_or_name :
diag::warn_pragma_expected_section_push_pop_or_name;
PP.Diag(PragmaLocation, DiagID) << PragmaName;
return false;
}
ExprResult StringResult = ParseStringLiteralExpression();
if (StringResult.isInvalid())
return false; // Already diagnosed.
SegmentName = cast<StringLiteral>(StringResult.get());
if (SegmentName->getCharByteWidth() != 1) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_non_wide_string)
<< PragmaName;
return false;
}
// Setting section "" has no effect
if (SegmentName->getLength())
Action = (Sema::PragmaMsStackAction)(Action | Sema::PSK_Set);
}
if (Tok.isNot(tok::r_paren)) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_rparen) << PragmaName;
return false;
}
PP.Lex(Tok); // )
if (Tok.isNot(tok::eof)) {
PP.Diag(PragmaLocation, diag::warn_pragma_extra_tokens_at_eol)
<< PragmaName;
return false;
}
PP.Lex(Tok); // eof
Actions.ActOnPragmaMSSeg(PragmaLocation, Action, SlotLabel,
SegmentName, PragmaName);
return true;
}
// #pragma init_seg({ compiler | lib | user | "section-name" [, func-name]} )
bool Parser::HandlePragmaMSInitSeg(StringRef PragmaName,
SourceLocation PragmaLocation) {
if (getTargetInfo().getTriple().getEnvironment() != llvm::Triple::MSVC) {
PP.Diag(PragmaLocation, diag::warn_pragma_init_seg_unsupported_target);
return false;
}
if (ExpectAndConsume(tok::l_paren, diag::warn_pragma_expected_lparen,
PragmaName))
return false;
// Parse either the known section names or the string section name.
StringLiteral *SegmentName = nullptr;
if (Tok.isAnyIdentifier()) {
auto *II = Tok.getIdentifierInfo();
StringRef Section = llvm::StringSwitch<StringRef>(II->getName())
.Case("compiler", "\".CRT$XCC\"")
.Case("lib", "\".CRT$XCL\"")
.Case("user", "\".CRT$XCU\"")
.Default("");
if (!Section.empty()) {
// Pretend the user wrote the appropriate string literal here.
Token Toks[1];
Toks[0].startToken();
Toks[0].setKind(tok::string_literal);
Toks[0].setLocation(Tok.getLocation());
Toks[0].setLiteralData(Section.data());
Toks[0].setLength(Section.size());
SegmentName =
cast<StringLiteral>(Actions.ActOnStringLiteral(Toks, nullptr).get());
PP.Lex(Tok);
}
} else if (Tok.is(tok::string_literal)) {
ExprResult StringResult = ParseStringLiteralExpression();
if (StringResult.isInvalid())
return false;
SegmentName = cast<StringLiteral>(StringResult.get());
if (SegmentName->getCharByteWidth() != 1) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_non_wide_string)
<< PragmaName;
return false;
}
// FIXME: Add support for the '[, func-name]' part of the pragma.
}
if (!SegmentName) {
PP.Diag(PragmaLocation, diag::warn_pragma_expected_init_seg) << PragmaName;
return false;
}
if (ExpectAndConsume(tok::r_paren, diag::warn_pragma_expected_rparen,
PragmaName) ||
ExpectAndConsume(tok::eof, diag::warn_pragma_extra_tokens_at_eol,
PragmaName))
return false;
Actions.ActOnPragmaMSInitSeg(PragmaLocation, SegmentName);
return true;
}
namespace {
struct PragmaLoopHintInfo {
Token PragmaName;
Token Option;
ArrayRef<Token> Toks;
};
} // end anonymous namespace
static std::string PragmaLoopHintString(Token PragmaName, Token Option) {
std::string PragmaString;
if (PragmaName.getIdentifierInfo()->getName() == "loop") {
PragmaString = "clang loop ";
PragmaString += Option.getIdentifierInfo()->getName();
} else {
assert(PragmaName.getIdentifierInfo()->getName() == "unroll" &&
"Unexpected pragma name");
PragmaString = "unroll";
}
return PragmaString;
}
bool Parser::HandlePragmaLoopHint(LoopHint &Hint) {
assert(Tok.is(tok::annot_pragma_loop_hint));
PragmaLoopHintInfo *Info =
static_cast<PragmaLoopHintInfo *>(Tok.getAnnotationValue());
IdentifierInfo *PragmaNameInfo = Info->PragmaName.getIdentifierInfo();
Hint.PragmaNameLoc = IdentifierLoc::create(
Actions.Context, Info->PragmaName.getLocation(), PragmaNameInfo);
// It is possible that the loop hint has no option identifier, such as
// #pragma unroll(4).
IdentifierInfo *OptionInfo = Info->Option.is(tok::identifier)
? Info->Option.getIdentifierInfo()
: nullptr;
Hint.OptionLoc = IdentifierLoc::create(
Actions.Context, Info->Option.getLocation(), OptionInfo);
const Token *Toks = Info->Toks.data();
size_t TokSize = Info->Toks.size();
// Return a valid hint if pragma unroll or nounroll were specified
// without an argument.
bool PragmaUnroll = PragmaNameInfo->getName() == "unroll";
bool PragmaNoUnroll = PragmaNameInfo->getName() == "nounroll";
if (TokSize == 0 && (PragmaUnroll || PragmaNoUnroll)) {
ConsumeToken(); // The annotation token.
Hint.Range = Info->PragmaName.getLocation();
return true;
}
// The constant expression is always followed by an eof token, which increases
// the TokSize by 1.
assert(TokSize > 0 &&
"PragmaLoopHintInfo::Toks must contain at least one token.");
// If no option is specified the argument is assumed to be a constant expr.
bool OptionUnroll = false;
bool StateOption = false;
if (OptionInfo) { // Pragma Unroll does not specify an option.
OptionUnroll = OptionInfo->isStr("unroll");
StateOption = llvm::StringSwitch<bool>(OptionInfo->getName())
.Case("vectorize", true)
.Case("interleave", true)
.Case("unroll", true)
.Default(false);
}
// Verify loop hint has an argument.
if (Toks[0].is(tok::eof)) {
ConsumeToken(); // The annotation token.
Diag(Toks[0].getLocation(), diag::err_pragma_loop_missing_argument)
<< /*StateArgument=*/StateOption << /*FullKeyword=*/OptionUnroll;
return false;
}
// Validate the argument.
if (StateOption) {
ConsumeToken(); // The annotation token.
SourceLocation StateLoc = Toks[0].getLocation();
IdentifierInfo *StateInfo = Toks[0].getIdentifierInfo();
if (!StateInfo ||
(!StateInfo->isStr("enable") && !StateInfo->isStr("disable") &&
((OptionUnroll && !StateInfo->isStr("full")) ||
(!OptionUnroll && !StateInfo->isStr("assume_safety"))))) {
Diag(Toks[0].getLocation(), diag::err_pragma_invalid_keyword)
<< /*FullKeyword=*/OptionUnroll;
return false;
}
if (TokSize > 2)
Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< PragmaLoopHintString(Info->PragmaName, Info->Option);
Hint.StateLoc = IdentifierLoc::create(Actions.Context, StateLoc, StateInfo);
} else {
// Enter constant expression including eof terminator into token stream.
PP.EnterTokenStream(Toks, TokSize, /*DisableMacroExpansion=*/false,
/*OwnsTokens=*/false);
ConsumeToken(); // The annotation token.
ExprResult R = ParseConstantExpression();
// Tokens following an error in an ill-formed constant expression will
// remain in the token stream and must be removed.
if (Tok.isNot(tok::eof)) {
Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< PragmaLoopHintString(Info->PragmaName, Info->Option);
while (Tok.isNot(tok::eof))
ConsumeAnyToken();
}
ConsumeToken(); // Consume the constant expression eof terminator.
if (R.isInvalid() ||
Actions.CheckLoopHintExpr(R.get(), Toks[0].getLocation()))
return false;
// Argument is a constant expression with an integer type.
Hint.ValueExpr = R.get();
}
Hint.Range = SourceRange(Info->PragmaName.getLocation(),
Info->Toks[TokSize - 1].getLocation());
return true;
}
// #pragma GCC visibility comes in two variants:
// 'push' '(' [visibility] ')'
// 'pop'
void PragmaGCCVisibilityHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &VisTok) {
SourceLocation VisLoc = VisTok.getLocation();
Token Tok;
PP.LexUnexpandedToken(Tok);
const IdentifierInfo *PushPop = Tok.getIdentifierInfo();
const IdentifierInfo *VisType;
if (PushPop && PushPop->isStr("pop")) {
VisType = nullptr;
} else if (PushPop && PushPop->isStr("push")) {
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_lparen)
<< "visibility";
return;
}
PP.LexUnexpandedToken(Tok);
VisType = Tok.getIdentifierInfo();
if (!VisType) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< "visibility";
return;
}
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_rparen)
<< "visibility";
return;
}
} else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< "visibility";
return;
}
SourceLocation EndLoc = Tok.getLocation();
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "visibility";
return;
}
Token *Toks = new Token[1];
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_vis);
Toks[0].setLocation(VisLoc);
Toks[0].setAnnotationEndLoc(EndLoc);
Toks[0].setAnnotationValue(
const_cast<void*>(static_cast<const void*>(VisType)));
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/true);
}
// #pragma pack(...) comes in the following delicious flavors:
// pack '(' [integer] ')'
// pack '(' 'show' ')'
// pack '(' ('push' | 'pop') [',' identifier] [, integer] ')'
void PragmaPackHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &PackTok) {
SourceLocation PackLoc = PackTok.getLocation();
Token Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_lparen) << "pack";
return;
}
Sema::PragmaPackKind Kind = Sema::PPK_Default;
IdentifierInfo *Name = nullptr;
Token Alignment;
Alignment.startToken();
SourceLocation LParenLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.is(tok::numeric_constant)) {
Alignment = Tok;
PP.Lex(Tok);
// In MSVC/gcc, #pragma pack(4) sets the alignment without affecting
// the push/pop stack.
// In Apple gcc, #pragma pack(4) is equivalent to #pragma pack(push, 4)
if (PP.getLangOpts().ApplePragmaPack)
Kind = Sema::PPK_Push;
} else if (Tok.is(tok::identifier)) {
const IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("show")) {
Kind = Sema::PPK_Show;
PP.Lex(Tok);
} else {
if (II->isStr("push")) {
Kind = Sema::PPK_Push;
} else if (II->isStr("pop")) {
Kind = Sema::PPK_Pop;
} else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_invalid_action) << "pack";
return;
}
PP.Lex(Tok);
if (Tok.is(tok::comma)) {
PP.Lex(Tok);
if (Tok.is(tok::numeric_constant)) {
Alignment = Tok;
PP.Lex(Tok);
} else if (Tok.is(tok::identifier)) {
Name = Tok.getIdentifierInfo();
PP.Lex(Tok);
if (Tok.is(tok::comma)) {
PP.Lex(Tok);
if (Tok.isNot(tok::numeric_constant)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_malformed);
return;
}
Alignment = Tok;
PP.Lex(Tok);
}
} else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_malformed);
return;
}
}
}
} else if (PP.getLangOpts().ApplePragmaPack) {
// In MSVC/gcc, #pragma pack() resets the alignment without affecting
// the push/pop stack.
// In Apple gcc #pragma pack() is equivalent to #pragma pack(pop).
Kind = Sema::PPK_Pop;
}
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_rparen) << "pack";
return;
}
SourceLocation RParenLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol) << "pack";
return;
}
PragmaPackInfo *Info =
(PragmaPackInfo*) PP.getPreprocessorAllocator().Allocate(
sizeof(PragmaPackInfo), llvm::alignOf<PragmaPackInfo>());
new (Info) PragmaPackInfo();
Info->Kind = Kind;
Info->Name = Name;
Info->Alignment = Alignment;
Info->LParenLoc = LParenLoc;
Info->RParenLoc = RParenLoc;
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 1, llvm::alignOf<Token>());
new (Toks) Token();
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_pack);
Toks[0].setLocation(PackLoc);
Toks[0].setAnnotationEndLoc(RParenLoc);
Toks[0].setAnnotationValue(static_cast<void*>(Info));
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/false);
}
// #pragma ms_struct on
// #pragma ms_struct off
void PragmaMSStructHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &MSStructTok) {
Sema::PragmaMSStructKind Kind = Sema::PMSST_OFF;
Token Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_ms_struct);
return;
}
SourceLocation EndLoc = Tok.getLocation();
const IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("on")) {
Kind = Sema::PMSST_ON;
PP.Lex(Tok);
}
else if (II->isStr("off") || II->isStr("reset"))
PP.Lex(Tok);
else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_ms_struct);
return;
}
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "ms_struct";
return;
}
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 1, llvm::alignOf<Token>());
new (Toks) Token();
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_msstruct);
Toks[0].setLocation(MSStructTok.getLocation());
Toks[0].setAnnotationEndLoc(EndLoc);
Toks[0].setAnnotationValue(reinterpret_cast<void*>(
static_cast<uintptr_t>(Kind)));
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/false);
}
// #pragma 'align' '=' {'native','natural','mac68k','power','reset'}
// #pragma 'options 'align' '=' {'native','natural','mac68k','power','reset'}
static void ParseAlignPragma(Preprocessor &PP, Token &FirstTok,
bool IsOptions) {
Token Tok;
if (IsOptions) {
PP.Lex(Tok);
if (Tok.isNot(tok::identifier) ||
!Tok.getIdentifierInfo()->isStr("align")) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_options_expected_align);
return;
}
}
PP.Lex(Tok);
if (Tok.isNot(tok::equal)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_align_expected_equal)
<< IsOptions;
return;
}
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< (IsOptions ? "options" : "align");
return;
}
Sema::PragmaOptionsAlignKind Kind = Sema::POAK_Natural;
const IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("native"))
Kind = Sema::POAK_Native;
else if (II->isStr("natural"))
Kind = Sema::POAK_Natural;
else if (II->isStr("packed"))
Kind = Sema::POAK_Packed;
else if (II->isStr("power"))
Kind = Sema::POAK_Power;
else if (II->isStr("mac68k"))
Kind = Sema::POAK_Mac68k;
else if (II->isStr("reset"))
Kind = Sema::POAK_Reset;
else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_align_invalid_option)
<< IsOptions;
return;
}
SourceLocation EndLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< (IsOptions ? "options" : "align");
return;
}
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 1, llvm::alignOf<Token>());
new (Toks) Token();
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_align);
Toks[0].setLocation(FirstTok.getLocation());
Toks[0].setAnnotationEndLoc(EndLoc);
Toks[0].setAnnotationValue(reinterpret_cast<void*>(
static_cast<uintptr_t>(Kind)));
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/false);
}
void PragmaAlignHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &AlignTok) {
ParseAlignPragma(PP, AlignTok, /*IsOptions=*/false);
}
void PragmaOptionsHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &OptionsTok) {
ParseAlignPragma(PP, OptionsTok, /*IsOptions=*/true);
}
// #pragma unused(identifier)
void PragmaUnusedHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &UnusedTok) {
// FIXME: Should we be expanding macros here? My guess is no.
SourceLocation UnusedLoc = UnusedTok.getLocation();
// Lex the left '('.
Token Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_lparen) << "unused";
return;
}
// Lex the declaration reference(s).
SmallVector<Token, 5> Identifiers;
SourceLocation RParenLoc;
bool LexID = true;
while (true) {
PP.Lex(Tok);
if (LexID) {
if (Tok.is(tok::identifier)) {
Identifiers.push_back(Tok);
LexID = false;
continue;
}
// Illegal token!
PP.Diag(Tok.getLocation(), diag::warn_pragma_unused_expected_var);
return;
}
// We are execting a ')' or a ','.
if (Tok.is(tok::comma)) {
LexID = true;
continue;
}
if (Tok.is(tok::r_paren)) {
RParenLoc = Tok.getLocation();
break;
}
// Illegal token!
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_punc) << "unused";
return;
}
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol) <<
"unused";
return;
}
// Verify that we have a location for the right parenthesis.
assert(RParenLoc.isValid() && "Valid '#pragma unused' must have ')'");
assert(!Identifiers.empty() && "Valid '#pragma unused' must have arguments");
// For each identifier token, insert into the token stream a
// annot_pragma_unused token followed by the identifier token.
// This allows us to cache a "#pragma unused" that occurs inside an inline
// C++ member function.
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 2 * Identifiers.size(), llvm::alignOf<Token>());
for (unsigned i=0; i != Identifiers.size(); i++) {
Token &pragmaUnusedTok = Toks[2*i], &idTok = Toks[2*i+1];
pragmaUnusedTok.startToken();
pragmaUnusedTok.setKind(tok::annot_pragma_unused);
pragmaUnusedTok.setLocation(UnusedLoc);
idTok = Identifiers[i];
}
PP.EnterTokenStream(Toks, 2*Identifiers.size(),
/*DisableMacroExpansion=*/true, /*OwnsTokens=*/false);
}
// #pragma weak identifier
// #pragma weak identifier '=' identifier
void PragmaWeakHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &WeakTok) {
SourceLocation WeakLoc = WeakTok.getLocation();
Token Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier) << "weak";
return;
}
Token WeakName = Tok;
bool HasAlias = false;
Token AliasName;
PP.Lex(Tok);
if (Tok.is(tok::equal)) {
HasAlias = true;
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< "weak";
return;
}
AliasName = Tok;
PP.Lex(Tok);
}
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol) << "weak";
return;
}
if (HasAlias) {
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 3, llvm::alignOf<Token>());
Token &pragmaUnusedTok = Toks[0];
pragmaUnusedTok.startToken();
pragmaUnusedTok.setKind(tok::annot_pragma_weakalias);
pragmaUnusedTok.setLocation(WeakLoc);
pragmaUnusedTok.setAnnotationEndLoc(AliasName.getLocation());
Toks[1] = WeakName;
Toks[2] = AliasName;
PP.EnterTokenStream(Toks, 3,
/*DisableMacroExpansion=*/true, /*OwnsTokens=*/false);
} else {
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 2, llvm::alignOf<Token>());
Token &pragmaUnusedTok = Toks[0];
pragmaUnusedTok.startToken();
pragmaUnusedTok.setKind(tok::annot_pragma_weak);
pragmaUnusedTok.setLocation(WeakLoc);
pragmaUnusedTok.setAnnotationEndLoc(WeakLoc);
Toks[1] = WeakName;
PP.EnterTokenStream(Toks, 2,
/*DisableMacroExpansion=*/true, /*OwnsTokens=*/false);
}
}
// #pragma redefine_extname identifier identifier
void PragmaRedefineExtnameHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &RedefToken) {
SourceLocation RedefLoc = RedefToken.getLocation();
Token Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier) <<
"redefine_extname";
return;
}
Token RedefName = Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< "redefine_extname";
return;
}
Token AliasName = Tok;
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol) <<
"redefine_extname";
return;
}
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 3, llvm::alignOf<Token>());
Token &pragmaRedefTok = Toks[0];
pragmaRedefTok.startToken();
pragmaRedefTok.setKind(tok::annot_pragma_redefine_extname);
pragmaRedefTok.setLocation(RedefLoc);
pragmaRedefTok.setAnnotationEndLoc(AliasName.getLocation());
Toks[1] = RedefName;
Toks[2] = AliasName;
PP.EnterTokenStream(Toks, 3,
/*DisableMacroExpansion=*/true, /*OwnsTokens=*/false);
}
void
PragmaFPContractHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
tok::OnOffSwitch OOS;
if (PP.LexOnOffSwitch(OOS))
return;
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 1, llvm::alignOf<Token>());
new (Toks) Token();
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_fp_contract);
Toks[0].setLocation(Tok.getLocation());
Toks[0].setAnnotationEndLoc(Tok.getLocation());
Toks[0].setAnnotationValue(reinterpret_cast<void*>(
static_cast<uintptr_t>(OOS)));
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/false);
}
void
PragmaOpenCLExtensionHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier) <<
"OPENCL";
return;
}
IdentifierInfo *ename = Tok.getIdentifierInfo();
SourceLocation NameLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::colon)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_colon) << ename;
return;
}
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_enable_disable);
return;
}
IdentifierInfo *op = Tok.getIdentifierInfo();
unsigned state;
if (op->isStr("enable")) {
state = 1;
} else if (op->isStr("disable")) {
state = 0;
} else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_enable_disable);
return;
}
SourceLocation StateLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol) <<
"OPENCL EXTENSION";
return;
}
OpenCLExtData data(ename, state);
Token *Toks =
(Token*) PP.getPreprocessorAllocator().Allocate(
sizeof(Token) * 1, llvm::alignOf<Token>());
new (Toks) Token();
Toks[0].startToken();
Toks[0].setKind(tok::annot_pragma_opencl_extension);
Toks[0].setLocation(NameLoc);
Toks[0].setAnnotationValue(data.getOpaqueValue());
Toks[0].setAnnotationEndLoc(StateLoc);
PP.EnterTokenStream(Toks, 1, /*DisableMacroExpansion=*/true,
/*OwnsTokens=*/false);
if (PP.getPPCallbacks())
PP.getPPCallbacks()->PragmaOpenCLExtension(NameLoc, ename,
StateLoc, state);
}
/// \brief Handle '#pragma omp ...' when OpenMP is disabled.
///
void
PragmaNoOpenMPHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &FirstTok) {
if (!PP.getDiagnostics().isIgnored(diag::warn_pragma_omp_ignored,
FirstTok.getLocation())) {
PP.Diag(FirstTok, diag::warn_pragma_omp_ignored);
PP.getDiagnostics().setSeverity(diag::warn_pragma_omp_ignored,
diag::Severity::Ignored, SourceLocation());
}
PP.DiscardUntilEndOfDirective();
}
/// \brief Handle '#pragma omp ...' when OpenMP is enabled.
///
void
PragmaOpenMPHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &FirstTok) {
SmallVector<Token, 16> Pragma;
Token Tok;
Tok.startToken();
Tok.setKind(tok::annot_pragma_openmp);
Tok.setLocation(FirstTok.getLocation());
while (Tok.isNot(tok::eod)) {
Pragma.push_back(Tok);
PP.Lex(Tok);
}
SourceLocation EodLoc = Tok.getLocation();
Tok.startToken();
Tok.setKind(tok::annot_pragma_openmp_end);
Tok.setLocation(EodLoc);
Pragma.push_back(Tok);
Token *Toks = new Token[Pragma.size()];
std::copy(Pragma.begin(), Pragma.end(), Toks);
PP.EnterTokenStream(Toks, Pragma.size(),
/*DisableMacroExpansion=*/false, /*OwnsTokens=*/true);
}
/// \brief Handle '#pragma pointers_to_members'
// The grammar for this pragma is as follows:
//
// <inheritance model> ::= ('single' | 'multiple' | 'virtual') '_inheritance'
//
// #pragma pointers_to_members '(' 'best_case' ')'
// #pragma pointers_to_members '(' 'full_generality' [',' inheritance-model] ')'
// #pragma pointers_to_members '(' inheritance-model ')'
void PragmaMSPointersToMembers::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
SourceLocation PointersToMembersLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(PointersToMembersLoc, diag::warn_pragma_expected_lparen)
<< "pointers_to_members";
return;
}
PP.Lex(Tok);
const IdentifierInfo *Arg = Tok.getIdentifierInfo();
if (!Arg) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_identifier)
<< "pointers_to_members";
return;
}
PP.Lex(Tok);
LangOptions::PragmaMSPointersToMembersKind RepresentationMethod;
if (Arg->isStr("best_case")) {
RepresentationMethod = LangOptions::PPTMK_BestCase;
} else {
if (Arg->isStr("full_generality")) {
if (Tok.is(tok::comma)) {
PP.Lex(Tok);
Arg = Tok.getIdentifierInfo();
if (!Arg) {
PP.Diag(Tok.getLocation(),
diag::err_pragma_pointers_to_members_unknown_kind)
<< Tok.getKind() << /*OnlyInheritanceModels*/ 0;
return;
}
PP.Lex(Tok);
} else if (Tok.is(tok::r_paren)) {
// #pragma pointers_to_members(full_generality) implicitly specifies
// virtual_inheritance.
Arg = nullptr;
RepresentationMethod = LangOptions::PPTMK_FullGeneralityVirtualInheritance;
} else {
PP.Diag(Tok.getLocation(), diag::err_expected_punc)
<< "full_generality";
return;
}
}
if (Arg) {
if (Arg->isStr("single_inheritance")) {
RepresentationMethod =
LangOptions::PPTMK_FullGeneralitySingleInheritance;
} else if (Arg->isStr("multiple_inheritance")) {
RepresentationMethod =
LangOptions::PPTMK_FullGeneralityMultipleInheritance;
} else if (Arg->isStr("virtual_inheritance")) {
RepresentationMethod =
LangOptions::PPTMK_FullGeneralityVirtualInheritance;
} else {
PP.Diag(Tok.getLocation(),
diag::err_pragma_pointers_to_members_unknown_kind)
<< Arg << /*HasPointerDeclaration*/ 1;
return;
}
}
}
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::err_expected_rparen_after)
<< (Arg ? Arg->getName() : "full_generality");
return;
}
SourceLocation EndLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "pointers_to_members";
return;
}
Token AnnotTok;
AnnotTok.startToken();
AnnotTok.setKind(tok::annot_pragma_ms_pointers_to_members);
AnnotTok.setLocation(PointersToMembersLoc);
AnnotTok.setAnnotationEndLoc(EndLoc);
AnnotTok.setAnnotationValue(
reinterpret_cast<void *>(static_cast<uintptr_t>(RepresentationMethod)));
PP.EnterToken(AnnotTok);
}
/// \brief Handle '#pragma vtordisp'
// The grammar for this pragma is as follows:
//
// <vtordisp-mode> ::= ('off' | 'on' | '0' | '1' | '2' )
//
// #pragma vtordisp '(' ['push' ','] vtordisp-mode ')'
// #pragma vtordisp '(' 'pop' ')'
// #pragma vtordisp '(' ')'
void PragmaMSVtorDisp::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
SourceLocation VtorDispLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(VtorDispLoc, diag::warn_pragma_expected_lparen) << "vtordisp";
return;
}
PP.Lex(Tok);
Sema::PragmaVtorDispKind Kind = Sema::PVDK_Set;
const IdentifierInfo *II = Tok.getIdentifierInfo();
if (II) {
if (II->isStr("push")) {
// #pragma vtordisp(push, mode)
PP.Lex(Tok);
if (Tok.isNot(tok::comma)) {
PP.Diag(VtorDispLoc, diag::warn_pragma_expected_punc) << "vtordisp";
return;
}
PP.Lex(Tok);
Kind = Sema::PVDK_Push;
// not push, could be on/off
} else if (II->isStr("pop")) {
// #pragma vtordisp(pop)
PP.Lex(Tok);
Kind = Sema::PVDK_Pop;
}
// not push or pop, could be on/off
} else {
if (Tok.is(tok::r_paren)) {
// #pragma vtordisp()
Kind = Sema::PVDK_Reset;
}
}
uint64_t Value = 0;
if (Kind == Sema::PVDK_Push || Kind == Sema::PVDK_Set) {
const IdentifierInfo *II = Tok.getIdentifierInfo();
if (II && II->isStr("off")) {
PP.Lex(Tok);
Value = 0;
} else if (II && II->isStr("on")) {
PP.Lex(Tok);
Value = 1;
} else if (Tok.is(tok::numeric_constant) &&
PP.parseSimpleIntegerLiteral(Tok, Value)) {
if (Value > 2) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_expected_integer)
<< 0 << 2 << "vtordisp";
return;
}
} else {
PP.Diag(Tok.getLocation(), diag::warn_pragma_invalid_action)
<< "vtordisp";
return;
}
}
// Finish the pragma: ')' $
if (Tok.isNot(tok::r_paren)) {
PP.Diag(VtorDispLoc, diag::warn_pragma_expected_rparen) << "vtordisp";
return;
}
SourceLocation EndLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "vtordisp";
return;
}
// Enter the annotation.
Token AnnotTok;
AnnotTok.startToken();
AnnotTok.setKind(tok::annot_pragma_ms_vtordisp);
AnnotTok.setLocation(VtorDispLoc);
AnnotTok.setAnnotationEndLoc(EndLoc);
AnnotTok.setAnnotationValue(reinterpret_cast<void *>(
static_cast<uintptr_t>((Kind << 16) | (Value & 0xFFFF))));
PP.EnterToken(AnnotTok);
}
/// \brief Handle all MS pragmas. Simply forwards the tokens after inserting
/// an annotation token.
void PragmaMSPragma::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
Token EoF, AnnotTok;
EoF.startToken();
EoF.setKind(tok::eof);
AnnotTok.startToken();
AnnotTok.setKind(tok::annot_pragma_ms_pragma);
AnnotTok.setLocation(Tok.getLocation());
AnnotTok.setAnnotationEndLoc(Tok.getLocation());
SmallVector<Token, 8> TokenVector;
// Suck up all of the tokens before the eod.
for (; Tok.isNot(tok::eod); PP.Lex(Tok)) {
TokenVector.push_back(Tok);
AnnotTok.setAnnotationEndLoc(Tok.getLocation());
}
// Add a sentinal EoF token to the end of the list.
TokenVector.push_back(EoF);
// We must allocate this array with new because EnterTokenStream is going to
// delete it later.
Token *TokenArray = new Token[TokenVector.size()];
std::copy(TokenVector.begin(), TokenVector.end(), TokenArray);
auto Value = new (PP.getPreprocessorAllocator())
std::pair<Token*, size_t>(std::make_pair(TokenArray, TokenVector.size()));
AnnotTok.setAnnotationValue(Value);
PP.EnterToken(AnnotTok);
}
/// \brief Handle the Microsoft \#pragma detect_mismatch extension.
///
/// The syntax is:
/// \code
/// #pragma detect_mismatch("name", "value")
/// \endcode
/// Where 'name' and 'value' are quoted strings. The values are embedded in
/// the object file and passed along to the linker. If the linker detects a
/// mismatch in the object file's values for the given name, a LNK2038 error
/// is emitted. See MSDN for more details.
void PragmaDetectMismatchHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
SourceLocation CommentLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(CommentLoc, diag::err_expected) << tok::l_paren;
return;
}
// Read the name to embed, which must be a string literal.
std::string NameString;
if (!PP.LexStringLiteral(Tok, NameString,
"pragma detect_mismatch",
/*MacroExpansion=*/true))
return;
// Read the comma followed by a second string literal.
std::string ValueString;
if (Tok.isNot(tok::comma)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_detect_mismatch_malformed);
return;
}
if (!PP.LexStringLiteral(Tok, ValueString, "pragma detect_mismatch",
/*MacroExpansion=*/true))
return;
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::err_expected) << tok::r_paren;
return;
}
PP.Lex(Tok); // Eat the r_paren.
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_detect_mismatch_malformed);
return;
}
// If the pragma is lexically sound, notify any interested PPCallbacks.
if (PP.getPPCallbacks())
PP.getPPCallbacks()->PragmaDetectMismatch(CommentLoc, NameString,
ValueString);
Actions.ActOnPragmaDetectMismatch(NameString, ValueString);
}
/// \brief Handle the microsoft \#pragma comment extension.
///
/// The syntax is:
/// \code
/// #pragma comment(linker, "foo")
/// \endcode
/// 'linker' is one of five identifiers: compiler, exestr, lib, linker, user.
/// "foo" is a string, which is fully macro expanded, and permits string
/// concatenation, embedded escape characters etc. See MSDN for more details.
void PragmaCommentHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
SourceLocation CommentLoc = Tok.getLocation();
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
PP.Diag(CommentLoc, diag::err_pragma_comment_malformed);
return;
}
// Read the identifier.
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(CommentLoc, diag::err_pragma_comment_malformed);
return;
}
// Verify that this is one of the 5 whitelisted options.
IdentifierInfo *II = Tok.getIdentifierInfo();
Sema::PragmaMSCommentKind Kind =
llvm::StringSwitch<Sema::PragmaMSCommentKind>(II->getName())
.Case("linker", Sema::PCK_Linker)
.Case("lib", Sema::PCK_Lib)
.Case("compiler", Sema::PCK_Compiler)
.Case("exestr", Sema::PCK_ExeStr)
.Case("user", Sema::PCK_User)
.Default(Sema::PCK_Unknown);
if (Kind == Sema::PCK_Unknown) {
PP.Diag(Tok.getLocation(), diag::err_pragma_comment_unknown_kind);
return;
}
// On PS4, issue a warning about any pragma comments other than
// #pragma comment lib.
if (PP.getTargetInfo().getTriple().isPS4() && Kind != Sema::PCK_Lib) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_comment_ignored)
<< II->getName();
return;
}
// Read the optional string if present.
PP.Lex(Tok);
std::string ArgumentString;
if (Tok.is(tok::comma) && !PP.LexStringLiteral(Tok, ArgumentString,
"pragma comment",
/*MacroExpansion=*/true))
return;
// FIXME: warn that 'exestr' is deprecated.
// FIXME: If the kind is "compiler" warn if the string is present (it is
// ignored).
// The MSDN docs say that "lib" and "linker" require a string and have a short
// whitelist of linker options they support, but in practice MSVC doesn't
// issue a diagnostic. Therefore neither does clang.
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_comment_malformed);
return;
}
PP.Lex(Tok); // eat the r_paren.
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_comment_malformed);
return;
}
// If the pragma is lexically sound, notify any interested PPCallbacks.
if (PP.getPPCallbacks())
PP.getPPCallbacks()->PragmaComment(CommentLoc, II, ArgumentString);
Actions.ActOnPragmaMSComment(Kind, ArgumentString);
}
// #pragma clang optimize off
// #pragma clang optimize on
void PragmaOptimizeHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &FirstToken) {
Token Tok;
PP.Lex(Tok);
if (Tok.is(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_missing_argument)
<< "clang optimize" << /*Expected=*/true << "'on' or 'off'";
return;
}
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_optimize_invalid_argument)
<< PP.getSpelling(Tok);
return;
}
const IdentifierInfo *II = Tok.getIdentifierInfo();
// The only accepted values are 'on' or 'off'.
bool IsOn = false;
if (II->isStr("on")) {
IsOn = true;
} else if (!II->isStr("off")) {
PP.Diag(Tok.getLocation(), diag::err_pragma_optimize_invalid_argument)
<< PP.getSpelling(Tok);
return;
}
PP.Lex(Tok);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_optimize_extra_argument)
<< PP.getSpelling(Tok);
return;
}
Actions.ActOnPragmaOptimize(IsOn, FirstToken.getLocation());
}
/// \brief Parses loop or unroll pragma hint value and fills in Info.
static bool ParseLoopHintValue(Preprocessor &PP, Token &Tok, Token PragmaName,
Token Option, bool ValueInParens,
PragmaLoopHintInfo &Info) {
SmallVector<Token, 1> ValueList;
int OpenParens = ValueInParens ? 1 : 0;
// Read constant expression.
while (Tok.isNot(tok::eod)) {
if (Tok.is(tok::l_paren))
OpenParens++;
else if (Tok.is(tok::r_paren)) {
OpenParens--;
if (OpenParens == 0 && ValueInParens)
break;
}
ValueList.push_back(Tok);
PP.Lex(Tok);
}
if (ValueInParens) {
// Read ')'
if (Tok.isNot(tok::r_paren)) {
PP.Diag(Tok.getLocation(), diag::err_expected) << tok::r_paren;
return true;
}
PP.Lex(Tok);
}
Token EOFTok;
EOFTok.startToken();
EOFTok.setKind(tok::eof);
EOFTok.setLocation(Tok.getLocation());
ValueList.push_back(EOFTok); // Terminates expression for parsing.
Info.Toks = llvm::makeArrayRef(ValueList).copy(PP.getPreprocessorAllocator());
Info.PragmaName = PragmaName;
Info.Option = Option;
return false;
}
/// \brief Handle the \#pragma clang loop directive.
/// #pragma clang 'loop' loop-hints
///
/// loop-hints:
/// loop-hint loop-hints[opt]
///
/// loop-hint:
/// 'vectorize' '(' loop-hint-keyword ')'
/// 'interleave' '(' loop-hint-keyword ')'
/// 'unroll' '(' unroll-hint-keyword ')'
/// 'vectorize_width' '(' loop-hint-value ')'
/// 'interleave_count' '(' loop-hint-value ')'
/// 'unroll_count' '(' loop-hint-value ')'
///
/// loop-hint-keyword:
/// 'enable'
/// 'disable'
/// 'assume_safety'
///
/// unroll-hint-keyword:
/// 'enable'
/// 'disable'
/// 'full'
///
/// loop-hint-value:
/// constant-expression
///
/// Specifying vectorize(enable) or vectorize_width(_value_) instructs llvm to
/// try vectorizing the instructions of the loop it precedes. Specifying
/// interleave(enable) or interleave_count(_value_) instructs llvm to try
/// interleaving multiple iterations of the loop it precedes. The width of the
/// vector instructions is specified by vectorize_width() and the number of
/// interleaved loop iterations is specified by interleave_count(). Specifying a
/// value of 1 effectively disables vectorization/interleaving, even if it is
/// possible and profitable, and 0 is invalid. The loop vectorizer currently
/// only works on inner loops.
///
/// The unroll and unroll_count directives control the concatenation
/// unroller. Specifying unroll(enable) instructs llvm to unroll the loop
/// completely if the trip count is known at compile time and unroll partially
/// if the trip count is not known. Specifying unroll(full) is similar to
/// unroll(enable) but will unroll the loop only if the trip count is known at
/// compile time. Specifying unroll(disable) disables unrolling for the
/// loop. Specifying unroll_count(_value_) instructs llvm to try to unroll the
/// loop the number of times indicated by the value.
void PragmaLoopHintHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
// Incoming token is "loop" from "#pragma clang loop".
Token PragmaName = Tok;
SmallVector<Token, 1> TokenList;
// Lex the optimization option and verify it is an identifier.
PP.Lex(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok.getLocation(), diag::err_pragma_loop_invalid_option)
<< /*MissingOption=*/true << "";
return;
}
while (Tok.is(tok::identifier)) {
Token Option = Tok;
IdentifierInfo *OptionInfo = Tok.getIdentifierInfo();
bool OptionValid = llvm::StringSwitch<bool>(OptionInfo->getName())
.Case("vectorize", true)
.Case("interleave", true)
.Case("unroll", true)
.Case("vectorize_width", true)
.Case("interleave_count", true)
.Case("unroll_count", true)
.Default(false);
if (!OptionValid) {
PP.Diag(Tok.getLocation(), diag::err_pragma_loop_invalid_option)
<< /*MissingOption=*/false << OptionInfo;
return;
}
PP.Lex(Tok);
// Read '('
if (Tok.isNot(tok::l_paren)) {
PP.Diag(Tok.getLocation(), diag::err_expected) << tok::l_paren;
return;
}
PP.Lex(Tok);
auto *Info = new (PP.getPreprocessorAllocator()) PragmaLoopHintInfo;
if (ParseLoopHintValue(PP, Tok, PragmaName, Option, /*ValueInParens=*/true,
*Info))
return;
// Generate the loop hint token.
Token LoopHintTok;
LoopHintTok.startToken();
LoopHintTok.setKind(tok::annot_pragma_loop_hint);
LoopHintTok.setLocation(PragmaName.getLocation());
LoopHintTok.setAnnotationEndLoc(PragmaName.getLocation());
LoopHintTok.setAnnotationValue(static_cast<void *>(Info));
TokenList.push_back(LoopHintTok);
}
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "clang loop";
return;
}
Token *TokenArray = new Token[TokenList.size()];
std::copy(TokenList.begin(), TokenList.end(), TokenArray);
PP.EnterTokenStream(TokenArray, TokenList.size(),
/*DisableMacroExpansion=*/false,
/*OwnsTokens=*/true);
}
/// \brief Handle the loop unroll optimization pragmas.
/// #pragma unroll
/// #pragma unroll unroll-hint-value
/// #pragma unroll '(' unroll-hint-value ')'
/// #pragma nounroll
///
/// unroll-hint-value:
/// constant-expression
///
/// Loop unrolling hints can be specified with '#pragma unroll' or
/// '#pragma nounroll'. '#pragma unroll' can take a numeric argument optionally
/// contained in parentheses. With no argument the directive instructs llvm to
/// try to unroll the loop completely. A positive integer argument can be
/// specified to indicate the number of times the loop should be unrolled. To
/// maximize compatibility with other compilers the unroll count argument can be
/// specified with or without parentheses. Specifying, '#pragma nounroll'
/// disables unrolling of the loop.
void PragmaUnrollHintHandler::HandlePragma(Preprocessor &PP,
PragmaIntroducerKind Introducer,
Token &Tok) {
// Incoming token is "unroll" for "#pragma unroll", or "nounroll" for
// "#pragma nounroll".
Token PragmaName = Tok;
PP.Lex(Tok);
auto *Info = new (PP.getPreprocessorAllocator()) PragmaLoopHintInfo;
if (Tok.is(tok::eod)) {
// nounroll or unroll pragma without an argument.
Info->PragmaName = PragmaName;
Info->Option.startToken();
} else if (PragmaName.getIdentifierInfo()->getName() == "nounroll") {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "nounroll";
return;
} else {
// Unroll pragma with an argument: "#pragma unroll N" or
// "#pragma unroll(N)".
// Read '(' if it exists.
bool ValueInParens = Tok.is(tok::l_paren);
if (ValueInParens)
PP.Lex(Tok);
Token Option;
Option.startToken();
if (ParseLoopHintValue(PP, Tok, PragmaName, Option, ValueInParens, *Info))
return;
// In CUDA, the argument to '#pragma unroll' should not be contained in
// parentheses.
if (PP.getLangOpts().CUDA && ValueInParens)
PP.Diag(Info->Toks[0].getLocation(),
diag::warn_pragma_unroll_cuda_value_in_parens);
if (Tok.isNot(tok::eod)) {
PP.Diag(Tok.getLocation(), diag::warn_pragma_extra_tokens_at_eol)
<< "unroll";
return;
}
}
// Generate the hint token.
Token *TokenArray = new Token[1];
TokenArray[0].startToken();
TokenArray[0].setKind(tok::annot_pragma_loop_hint);
TokenArray[0].setLocation(PragmaName.getLocation());
TokenArray[0].setAnnotationEndLoc(PragmaName.getLocation());
TokenArray[0].setAnnotationValue(static_cast<void *>(Info));
PP.EnterTokenStream(TokenArray, 1, /*DisableMacroExpansion=*/false,
/*OwnsTokens=*/true);
}
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