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//===-- TargetAttributesSema.cpp - Encapsulate target attributes-*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains semantic analysis implementation for target-specific
// attributes.
//
//===----------------------------------------------------------------------===//
#include "TargetAttributesSema.h"
#include "clang/Sema/SemaInternal.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/AST/DeclCXX.h"
#include "llvm/ADT/Triple.h"
using namespace clang;
TargetAttributesSema::~TargetAttributesSema() {}
bool TargetAttributesSema::ProcessDeclAttribute(Scope *scope, Decl *D,
const AttributeList &Attr, Sema &S) const {
return false;
}
static void HandleMSP430InterruptAttr(Decl *d,
const AttributeList &Attr, Sema &S) {
// Check the attribute arguments.
if (Attr.getNumArgs() != 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
// FIXME: Check for decl - it should be void ()(void).
Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0));
llvm::APSInt NumParams(32);
if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
<< "interrupt" << NumParamsExpr->getSourceRange();
return;
}
unsigned Num = NumParams.getLimitedValue(255);
if ((Num & 1) || Num > 30) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< "interrupt" << (int)NumParams.getSExtValue()
<< NumParamsExpr->getSourceRange();
return;
}
d->addAttr(::new (S.Context) MSP430InterruptAttr(Attr.getLoc(), S.Context, Num));
d->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context));
}
namespace {
class MSP430AttributesSema : public TargetAttributesSema {
public:
MSP430AttributesSema() { }
bool ProcessDeclAttribute(Scope *scope, Decl *D,
const AttributeList &Attr, Sema &S) const {
if (Attr.getName()->getName() == "interrupt") {
HandleMSP430InterruptAttr(D, Attr, S);
return true;
}
return false;
}
};
}
static void HandleX86ForceAlignArgPointerAttr(Decl *D,
const AttributeList& Attr,
Sema &S) {
// Check the attribute arguments.
if (Attr.getNumArgs() != 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
return;
}
// If we try to apply it to a function pointer, don't warn, but don't
// do anything, either. It doesn't matter anyway, because there's nothing
// special about calling a force_align_arg_pointer function.
ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (VD && VD->getType()->isFunctionPointerType())
return;
// Also don't warn on function pointer typedefs.
TypedefDecl *TD = dyn_cast<TypedefDecl>(D);
if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
TD->getUnderlyingType()->isFunctionType()))
return;
// Attribute can only be applied to function types.
if (!isa<FunctionDecl>(D)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << /* function */0;
return;
}
D->addAttr(::new (S.Context) X86ForceAlignArgPointerAttr(Attr.getLoc(), S.Context));
}
static void HandleDLLImportAttr(Decl *D, const AttributeList &Attr, Sema &S) {
// check the attribute arguments.
if (Attr.getNumArgs() != 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
return;
}
// Attribute can be applied only to functions or variables.
if (isa<VarDecl>(D)) {
D->addAttr(::new (S.Context) DLLImportAttr(Attr.getLoc(), S.Context));
return;
}
FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
if (!FD) {
// Apparently Visual C++ thinks it is okay to not emit a warning
// in this case, so only emit a warning when -fms-extensions is not
// specified.
if (!S.getLangOptions().Microsoft)
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << 2 /*variable and function*/;
return;
}
// Currently, the dllimport attribute is ignored for inlined functions.
// Warning is emitted.
if (FD->isInlineSpecified()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
return;
}
// The attribute is also overridden by a subsequent declaration as dllexport.
// Warning is emitted.
for (AttributeList *nextAttr = Attr.getNext(); nextAttr;
nextAttr = nextAttr->getNext()) {
if (nextAttr->getKind() == AttributeList::AT_dllexport) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
return;
}
}
if (D->getAttr<DLLExportAttr>()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
return;
}
D->addAttr(::new (S.Context) DLLImportAttr(Attr.getLoc(), S.Context));
}
static void HandleDLLExportAttr(Decl *D, const AttributeList &Attr, Sema &S) {
// check the attribute arguments.
if (Attr.getNumArgs() != 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
return;
}
// Attribute can be applied only to functions or variables.
if (isa<VarDecl>(D)) {
D->addAttr(::new (S.Context) DLLExportAttr(Attr.getLoc(), S.Context));
return;
}
FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
if (!FD) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << 2 /*variable and function*/;
return;
}
// Currently, the dllexport attribute is ignored for inlined functions, unless
// the -fkeep-inline-functions flag has been used. Warning is emitted;
if (FD->isInlineSpecified()) {
// FIXME: ... unless the -fkeep-inline-functions flag has been used.
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllexport";
return;
}
D->addAttr(::new (S.Context) DLLExportAttr(Attr.getLoc(), S.Context));
}
namespace {
class X86AttributesSema : public TargetAttributesSema {
public:
X86AttributesSema() { }
bool ProcessDeclAttribute(Scope *scope, Decl *D,
const AttributeList &Attr, Sema &S) const {
const llvm::Triple &Triple(S.Context.Target.getTriple());
if (Triple.getOS() == llvm::Triple::Win32 ||
Triple.getOS() == llvm::Triple::MinGW32 ||
Triple.getOS() == llvm::Triple::MinGW64) {
switch (Attr.getKind()) {
case AttributeList::AT_dllimport: HandleDLLImportAttr(D, Attr, S);
return true;
case AttributeList::AT_dllexport: HandleDLLExportAttr(D, Attr, S);
return true;
default: break;
}
}
if (Attr.getName()->getName() == "force_align_arg_pointer" ||
Attr.getName()->getName() == "__force_align_arg_pointer__") {
HandleX86ForceAlignArgPointerAttr(D, Attr, S);
return true;
}
return false;
}
};
}
const TargetAttributesSema &Sema::getTargetAttributesSema() const {
if (TheTargetAttributesSema)
return *TheTargetAttributesSema;
const llvm::Triple &Triple(Context.Target.getTriple());
switch (Triple.getArch()) {
default:
return *(TheTargetAttributesSema = new TargetAttributesSema);
case llvm::Triple::msp430:
return *(TheTargetAttributesSema = new MSP430AttributesSema);
case llvm::Triple::x86:
return *(TheTargetAttributesSema = new X86AttributesSema);
}
}
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