#include "clang/Sema/SemaInternal.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Lookup.h"
using namespace clang;
namespace {
struct PackStackEntry {
static const unsigned kMac68kAlignmentSentinel = ~0U;
unsigned Alignment;
IdentifierInfo *Name;
};
class PragmaPackStack {
typedef std::vector<PackStackEntry> stack_ty;
unsigned Alignment;
stack_ty Stack;
public:
PragmaPackStack() : Alignment(0) {}
void setAlignment(unsigned A) { Alignment = A; }
unsigned getAlignment() { return Alignment; }
void push(IdentifierInfo *Name) {
PackStackEntry PSE = { Alignment, Name };
Stack.push_back(PSE);
}
bool pop(IdentifierInfo *Name, bool IsReset);
};
}
bool PragmaPackStack::pop(IdentifierInfo *Name, bool IsReset) {
if (!Name) {
if (Stack.empty()) {
if (!IsReset)
return false;
if (!Alignment)
return false;
Alignment = 0;
} else {
Alignment = Stack.back().Alignment;
Stack.pop_back();
}
return true;
}
for (unsigned i = Stack.size(); i != 0; ) {
--i;
if (Stack[i].Name == Name) {
Alignment = Stack[i].Alignment;
Stack.erase(Stack.begin() + i, Stack.end());
return true;
}
}
return false;
}
void Sema::FreePackedContext() {
delete static_cast<PragmaPackStack*>(PackContext);
PackContext = 0;
}
void Sema::AddAlignmentAttributesForRecord(RecordDecl *RD) {
if (!PackContext)
return;
PragmaPackStack *Stack = static_cast<PragmaPackStack*>(PackContext);
if (unsigned Alignment = Stack->getAlignment()) {
if (Alignment == PackStackEntry::kMac68kAlignmentSentinel)
RD->addAttr(AlignMac68kAttr::CreateImplicit(Context));
else
RD->addAttr(MaxFieldAlignmentAttr::CreateImplicit(Context,
Alignment * 8));
}
}
void Sema::AddMsStructLayoutForRecord(RecordDecl *RD) {
if (!MSStructPragmaOn)
return;
RD->addAttr(MsStructAttr::CreateImplicit(Context));
}
void Sema::ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
SourceLocation PragmaLoc) {
if (PackContext == 0)
PackContext = new PragmaPackStack();
PragmaPackStack *Context = static_cast<PragmaPackStack*>(PackContext);
switch (Kind) {
case POAK_Native:
case POAK_Power:
case POAK_Natural:
Context->push(0);
Context->setAlignment(0);
break;
case POAK_Packed:
Context->push(0);
Context->setAlignment(1);
break;
case POAK_Mac68k:
if (!PP.getTargetInfo().hasAlignMac68kSupport()) {
Diag(PragmaLoc, diag::err_pragma_options_align_mac68k_target_unsupported);
return;
}
Context->push(0);
Context->setAlignment(PackStackEntry::kMac68kAlignmentSentinel);
break;
case POAK_Reset:
if (!Context->pop(0, true)) {
Diag(PragmaLoc, diag::warn_pragma_options_align_reset_failed)
<< "stack empty";
}
break;
}
}
void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name,
Expr *alignment, SourceLocation PragmaLoc,
SourceLocation LParenLoc, SourceLocation RParenLoc) {
Expr *Alignment = static_cast<Expr *>(alignment);
unsigned AlignmentVal = 0;
if (Alignment) {
llvm::APSInt Val;
if (Alignment->isTypeDependent() ||
Alignment->isValueDependent() ||
!Alignment->isIntegerConstantExpr(Val, Context) ||
!(Val == 0 || Val.isPowerOf2()) ||
Val.getZExtValue() > 16) {
Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment);
return; }
AlignmentVal = (unsigned) Val.getZExtValue();
}
if (PackContext == 0)
PackContext = new PragmaPackStack();
PragmaPackStack *Context = static_cast<PragmaPackStack*>(PackContext);
switch (Kind) {
case Sema::PPK_Default: Context->setAlignment(AlignmentVal);
break;
case Sema::PPK_Show: AlignmentVal = Context->getAlignment();
if (AlignmentVal == 0)
AlignmentVal = 8;
if (AlignmentVal == PackStackEntry::kMac68kAlignmentSentinel)
Diag(PragmaLoc, diag::warn_pragma_pack_show) << "mac68k";
else
Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal;
break;
case Sema::PPK_Push: Context->push(Name);
if (Alignment)
Context->setAlignment(AlignmentVal);
break;
case Sema::PPK_Pop: if (Alignment && Name)
Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment);
if (!Context->pop(Name, false)) {
Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed)
<< (Name ? "no record matching name" : "stack empty");
} else {
if (Alignment)
Context->setAlignment(AlignmentVal);
}
break;
}
}
void Sema::ActOnPragmaMSStruct(PragmaMSStructKind Kind) {
MSStructPragmaOn = (Kind == PMSST_ON);
}
void Sema::ActOnPragmaMSComment(PragmaMSCommentKind Kind, StringRef Arg) {
switch (Kind) {
case PCK_Unknown:
llvm_unreachable("unexpected pragma comment kind");
case PCK_Linker:
Consumer.HandleLinkerOptionPragma(Arg);
return;
case PCK_Lib:
Consumer.HandleDependentLibrary(Arg);
return;
case PCK_Compiler:
case PCK_ExeStr:
case PCK_User:
return; }
llvm_unreachable("invalid pragma comment kind");
}
void Sema::ActOnPragmaDetectMismatch(StringRef Name, StringRef Value) {
Consumer.HandleDetectMismatch(Name, Value);
}
void Sema::ActOnPragmaUnused(const Token &IdTok, Scope *curScope,
SourceLocation PragmaLoc) {
IdentifierInfo *Name = IdTok.getIdentifierInfo();
LookupResult Lookup(*this, Name, IdTok.getLocation(), LookupOrdinaryName);
LookupParsedName(Lookup, curScope, NULL, true);
if (Lookup.empty()) {
Diag(PragmaLoc, diag::warn_pragma_unused_undeclared_var)
<< Name << SourceRange(IdTok.getLocation());
return;
}
VarDecl *VD = Lookup.getAsSingle<VarDecl>();
if (!VD) {
Diag(PragmaLoc, diag::warn_pragma_unused_expected_var_arg)
<< Name << SourceRange(IdTok.getLocation());
return;
}
if (VD->isUsed())
Diag(PragmaLoc, diag::warn_used_but_marked_unused) << Name;
VD->addAttr(UnusedAttr::CreateImplicit(Context, IdTok.getLocation()));
}
void Sema::AddCFAuditedAttribute(Decl *D) {
SourceLocation Loc = PP.getPragmaARCCFCodeAuditedLoc();
if (!Loc.isValid()) return;
if (D->hasAttr<CFAuditedTransferAttr>() ||
D->hasAttr<CFUnknownTransferAttr>())
return;
D->addAttr(CFAuditedTransferAttr::CreateImplicit(Context, Loc));
}
typedef std::vector<std::pair<unsigned, SourceLocation> > VisStack;
enum { NoVisibility = (unsigned) -1 };
void Sema::AddPushedVisibilityAttribute(Decl *D) {
if (!VisContext)
return;
NamedDecl *ND = dyn_cast<NamedDecl>(D);
if (ND && ND->getExplicitVisibility(NamedDecl::VisibilityForValue))
return;
VisStack *Stack = static_cast<VisStack*>(VisContext);
unsigned rawType = Stack->back().first;
if (rawType == NoVisibility) return;
VisibilityAttr::VisibilityType type
= (VisibilityAttr::VisibilityType) rawType;
SourceLocation loc = Stack->back().second;
D->addAttr(VisibilityAttr::CreateImplicit(Context, type, loc));
}
void Sema::FreeVisContext() {
delete static_cast<VisStack*>(VisContext);
VisContext = 0;
}
static void PushPragmaVisibility(Sema &S, unsigned type, SourceLocation loc) {
if (!S.VisContext)
S.VisContext = new VisStack;
VisStack *Stack = static_cast<VisStack*>(S.VisContext);
Stack->push_back(std::make_pair(type, loc));
}
void Sema::ActOnPragmaVisibility(const IdentifierInfo* VisType,
SourceLocation PragmaLoc) {
if (VisType) {
VisibilityAttr::VisibilityType T;
if (!VisibilityAttr::ConvertStrToVisibilityType(VisType->getName(), T)) {
Diag(PragmaLoc, diag::warn_attribute_unknown_visibility) << VisType;
return;
}
PushPragmaVisibility(*this, T, PragmaLoc);
} else {
PopPragmaVisibility(false, PragmaLoc);
}
}
void Sema::ActOnPragmaFPContract(tok::OnOffSwitch OOS) {
switch (OOS) {
case tok::OOS_ON:
FPFeatures.fp_contract = 1;
break;
case tok::OOS_OFF:
FPFeatures.fp_contract = 0;
break;
case tok::OOS_DEFAULT:
FPFeatures.fp_contract = getLangOpts().DefaultFPContract;
break;
}
}
void Sema::PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
SourceLocation Loc) {
PushPragmaVisibility(*this, NoVisibility, Loc);
}
void Sema::PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc) {
if (!VisContext) {
Diag(EndLoc, diag::err_pragma_pop_visibility_mismatch);
return;
}
VisStack *Stack = static_cast<VisStack*>(VisContext);
const std::pair<unsigned, SourceLocation> *Back = &Stack->back();
bool StartsWithPragma = Back->first != NoVisibility;
if (StartsWithPragma && IsNamespaceEnd) {
Diag(Back->second, diag::err_pragma_push_visibility_mismatch);
Diag(EndLoc, diag::note_surrounding_namespace_ends_here);
do {
Stack->pop_back();
Back = &Stack->back();
StartsWithPragma = Back->first != NoVisibility;
} while (StartsWithPragma);
} else if (!StartsWithPragma && !IsNamespaceEnd) {
Diag(EndLoc, diag::err_pragma_pop_visibility_mismatch);
Diag(Back->second, diag::note_surrounding_namespace_starts_here);
return;
}
Stack->pop_back();
if (Stack->empty())
FreeVisContext();
}