This revision was automatically updated to reflect the committed changes.
Closed by commit rC332470: Add support for
__declspec(code_seg("segname")) (authored by erichkeane, committed by
).
Herald added a subscriber: cfe-commits.
Changed prior to commit:
https://reviews.llvm.org/D43352?vs=147075&id=147081#toc
Repository:
rC Clang
https://reviews.llvm.org/D43352
Files:
include/clang/Basic/Attr.td
include/clang/Basic/AttrDocs.td
include/clang/Basic/DiagnosticSemaKinds.td
include/clang/Sema/Sema.h
lib/Sema/SemaDecl.cpp
lib/Sema/SemaDeclAttr.cpp
lib/Sema/SemaDeclCXX.cpp
lib/Sema/SemaLambda.cpp
Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -2231,6 +2231,20 @@
CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
assert(CXXBaseDecl && "Base type is not a C++ type");
+ // Microsoft docs say:
+ // "If a base-class has a code_seg attribute, derived classes must have the
+ // same attribute."
+ const auto *BaseSA = CXXBaseDecl->getAttr<SectionAttr>();
+ const auto *DerivedSA = Class->getAttr<SectionAttr>();
+ if (BaseSA || DerivedSA) {
+ if (!BaseSA || !DerivedSA || BaseSA->getName() != DerivedSA->getName()) {
+ Diag(Class->getLocation(), diag::err_mismatched_code_seg_base);
+ Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here)
+ << CXXBaseDecl;
+ return nullptr;
+ }
+ }
+
// A class which contains a flexible array member is not suitable for use as a
// base class:
// - If the layout determines that a base comes before another base,
@@ -5576,6 +5590,16 @@
}
}
+void Sema::checkClassLevelSectionAttribute(CXXRecordDecl *Class) {
+ // Mark any compiler-generated routines with the implicit Section attribute.
+ for (auto *Method : Class->methods()) {
+ if (Method->isUserProvided())
+ continue;
+ if (Attr *A = getImplicitSectionAttrForFunction(Method))
+ Method->addAttr(A);
+ }
+}
+
/// Check class-level dllimport/dllexport attribute.
void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
Attr *ClassAttr = getDLLAttr(Class);
@@ -6079,6 +6103,7 @@
}
checkClassLevelDLLAttribute(Record);
+ checkClassLevelSectionAttribute(Record);
bool ClangABICompat4 =
Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4;
@@ -14531,6 +14556,16 @@
diag::note_overridden_marked_noescape);
}
}
+ // Virtual overrides must have the same code_seg.
+ const auto *OldSA = Old->getAttr<SectionAttr>();
+ const auto *NewSA = New->getAttr<SectionAttr>();
+ if (OldSA || NewSA) {
+ if (!OldSA || !NewSA || NewSA->getName() != OldSA->getName()) {
+ Diag(New->getLocation(), diag::err_mismatched_code_seg_override);
+ Diag(Old->getLocation(), diag::note_previous_declaration);
+ return true;
+ }
+ }
CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
Index: lib/Sema/SemaLambda.cpp
===================================================================
--- lib/Sema/SemaLambda.cpp
+++ lib/Sema/SemaLambda.cpp
@@ -910,6 +910,10 @@
AddRangeBasedOptnone(Method);
// Attributes on the lambda apply to the method.
+ if (Attr *A = getImplicitSectionAttrForFunction(Method))
+ Method->addAttr(A);
+
+ // Attributes on the lambda apply to the method.
ProcessDeclAttributes(CurScope, Method, ParamInfo);
// CUDA lambdas get implicit attributes based on the scope in which they're
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -2667,9 +2667,14 @@
Diag(New->getLocation(), diag::warn_attribute_section_on_redeclaration);
Diag(Old->getLocation(), diag::note_previous_declaration);
}
+ } else if (isa<CXXMethodDecl>(New)) {
+ const auto *NewSA = New->getAttr<SectionAttr>();
+ if (!NewSA->isImplicit()) {
+ Diag(New->getLocation(), diag::warn_mismatched_section);
+ Diag(Old->getLocation(), diag::note_previous_declaration);
+ }
}
}
-
if (!Old->hasAttrs())
return;
@@ -8716,18 +8721,18 @@
PragmaClangTextSection.PragmaLocation));
}
- // Apply an implicit SectionAttr if #pragma code_seg is active.
- if (CodeSegStack.CurrentValue && D.isFunctionDefinition() &&
- !NewFD->hasAttr<SectionAttr>()) {
- NewFD->addAttr(
- SectionAttr::CreateImplicit(Context, SectionAttr::Declspec_allocate,
- CodeSegStack.CurrentValue->getString(),
- CodeSegStack.CurrentPragmaLocation));
- if (UnifySection(CodeSegStack.CurrentValue->getString(),
- ASTContext::PSF_Implicit | ASTContext::PSF_Execute |
- ASTContext::PSF_Read,
- NewFD))
- NewFD->dropAttr<SectionAttr>();
+ // Apply an implicit SectionAttr from class declspec or from
+ // #pragma code_seg if active.
+ if (!NewFD->hasAttr<SectionAttr>()) {
+ if (Attr *SAttr = getImplicitSectionAttrForFunction(NewFD,
+ D.isFunctionDefinition())) {
+ NewFD->addAttr(SAttr);
+ if (UnifySection(cast<SectionAttr>(SAttr)->getName(),
+ ASTContext::PSF_Implicit | ASTContext::PSF_Execute |
+ ASTContext::PSF_Read,
+ NewFD))
+ NewFD->dropAttr<SectionAttr>();
+ }
}
// Handle attributes.
@@ -9177,6 +9182,64 @@
return NewFD;
}
+/// Return a SectionAttr from a containing class. The Microsoft docs say
+/// when __declspec(code_seg) "is applied to a class, all member functions of
+/// the class and nested classes -- this includes compiler-generated special
+/// member functions -- are put in the specified segment."
+/// The actual behavior is a little more complicated. The Microsoft compiler
+/// won't check outer classes if there is an active value from #pragma code_seg.
+/// The section is always applied from the direct parent but only from outer
+/// classes when the #pragma code_seg stack is empty. See:
+/// https://reviews.llvm.org/D22931, the Microsoft feedback page is no longer
+/// available since MS has removed the page.
+static Attr *getImplicitSectionAttrFromClass(Sema &S, const FunctionDecl *FD) {
+ const auto *Method = dyn_cast<CXXMethodDecl>(FD);
+ if (!Method)
+ return nullptr;
+ const CXXRecordDecl *Parent = Method->getParent();
+ if (const auto *SAttr = Parent->getAttr<SectionAttr>()) {
+ Attr *NewAttr = SAttr->clone(S.getASTContext());
+ NewAttr->setImplicit(true);
+ return NewAttr;
+ }
+
+ // The Microsoft compiler won't check outer classes for the section
+ // when the #pragma code_seg stack is active.
+ if (S.CodeSegStack.CurrentValue)
+ return nullptr;
+
+ while ((Parent = dyn_cast<CXXRecordDecl>(Parent->getParent()))) {
+ if (const auto *SAttr = Parent->getAttr<SectionAttr>()) {
+ Attr *NewAttr = SAttr->clone(S.getASTContext());
+ NewAttr->setImplicit(true);
+ return NewAttr;
+ }
+ }
+ return nullptr;
+}
+
+/// \brief Returns an implicit SectionAttr for a function.
+///
+/// \param FD Function being declared.
+/// \param IsDefinition Whether it is a definition or just a declarartion.
+/// \returns A SectionAttr to apply to the function or nullptr if no
+/// attribute should be added.
+///
+/// First tries to find a SectionAttr on a containing class (from
+/// a __declspec(code_seg)). If not found on the class, and if the function is
+/// also a definition it will use the current #pragma code_seg value.
+Attr *Sema::getImplicitSectionAttrForFunction(const FunctionDecl *FD, bool IsDefinition) {
+ if (Attr *A = getImplicitSectionAttrFromClass(*this, FD))
+ return A;
+ if (IsDefinition && CodeSegStack.CurrentValue) {
+ return SectionAttr::CreateImplicit(getASTContext(),
+ SectionAttr::Declspec_allocate,
+ CodeSegStack.CurrentValue->getString(),
+ CodeSegStack.CurrentPragmaLocation);
+ }
+ return nullptr;
+}
+
/// Checks if the new declaration declared in dependent context must be
/// put in the same redeclaration chain as the specified declaration.
///
Index: lib/Sema/SemaDeclAttr.cpp
===================================================================
--- lib/Sema/SemaDeclAttr.cpp
+++ lib/Sema/SemaDeclAttr.cpp
@@ -2853,6 +2853,13 @@
SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
StringRef Name,
unsigned AttrSpellingListIndex) {
+ // Explicit or partial specializations do not inherit
+ // the code_seg attribute from the primary template.
+ if (const auto *FD = dyn_cast<FunctionDecl>(D)){
+ if (FD->isFunctionTemplateSpecialization())
+ return nullptr;
+ }
+
if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
if (ExistingAttr->getName() == Name)
return nullptr;
@@ -2942,6 +2949,27 @@
D->addAttr(NewAttr);
}
+static void handleCodeSegAttr(Sema &S, Decl *D, const AttributeList &AL) {
+ StringRef Str;
+ SourceLocation LiteralLoc;
+ if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc))
+ return;
+ if (!S.checkSectionName(LiteralLoc, Str))
+ return;
+ if (const auto *ExistingAttr = D->getAttr<SectionAttr>()) {
+ if (!ExistingAttr->isImplicit()) {
+ S.Diag(AL.getLoc(),
+ ExistingAttr->getName() == Str
+ ? diag::warn_duplicate_codeseg_attribute
+ : diag::err_conflicting_codeseg_attribute);
+ return;
+ }
+ D->dropAttr<SectionAttr>();
+ }
+ D->addAttr(::new (S.Context) SectionAttr(
+ AL.getRange(), S.Context, Str, AL.getAttributeSpellingListIndex()));
+}
+
static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &AL) {
Expr *E = AL.getArgAsExpr(0);
SourceLocation Loc = E->getExprLoc();
@@ -6297,6 +6325,9 @@
case AttributeList::AT_Uuid:
handleUuidAttr(S, D, AL);
break;
+ case AttributeList::AT_CodeSeg:
+ handleCodeSegAttr(S, D, AL);
+ break;
case AttributeList::AT_MSInheritance:
handleMSInheritanceAttr(S, D, AL);
break;
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -1934,6 +1934,7 @@
bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
void CheckMain(FunctionDecl *FD, const DeclSpec &D);
void CheckMSVCRTEntryPoint(FunctionDecl *FD);
+ Attr *getImplicitSectionAttrForFunction(const FunctionDecl *FD, bool IsDefinition = true);
Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
SourceLocation Loc,
@@ -5836,6 +5837,7 @@
/// ensure that referenceDLLExportedClassMethods is called some point later
/// when all outer classes of Class are complete.
void checkClassLevelDLLAttribute(CXXRecordDecl *Class);
+ void checkClassLevelSectionAttribute(CXXRecordDecl *Class);
void referenceDLLExportedClassMethods();
Index: include/clang/Basic/AttrDocs.td
===================================================================
--- include/clang/Basic/AttrDocs.td
+++ include/clang/Basic/AttrDocs.td
@@ -306,6 +306,18 @@
}];
}
+def CodeSegDocs : Documentation {
+ let Category = DocCatFunction;
+ let Content = [{
+The ``__declspec(code_seg)`` attribute enables the placement of code into separate
+named segments that can be paged or locked in memory individually. This attribute
+is used to control the placement of instantiated templates and compiler-generated
+code. See the documentation for `__declspec(code_seg)`_ on MSDN.
+
+.. _`__declspec(code_seg)`: http://msdn.microsoft.com/en-us/library/dn636922.aspx
+ }];
+}
+
def AllocAlignDocs : Documentation {
let Category = DocCatFunction;
let Content = [{
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -2668,6 +2668,14 @@
def warn_attribute_section_on_redeclaration : Warning<
"section attribute is specified on redeclared variable">, InGroup<Section>;
+def err_mismatched_code_seg_base : Error<
+ "derived class must specify the same code segment as its base classes">;
+def err_mismatched_code_seg_override : Error<
+ "overriding virtual function must specify the same code segment as its overridden function">;
+def err_conflicting_codeseg_attribute : Error<
+ "conflicting code segment specifiers">;
+def warn_duplicate_codeseg_attribute : Warning<
+ "duplicate code segment specifiers">, InGroup<Section>;
def err_anonymous_property: Error<
"anonymous property is not supported">;
def err_property_is_variably_modified : Error<
Index: include/clang/Basic/Attr.td
===================================================================
--- include/clang/Basic/Attr.td
+++ include/clang/Basic/Attr.td
@@ -1769,6 +1769,13 @@
let Documentation = [SectionDocs];
}
+def CodeSeg : InheritableAttr {
+ let Spellings = [Declspec<"code_seg">];
+ let Args = [StringArgument<"Name">];
+ let Subjects = SubjectList<[Function, CXXRecord], ErrorDiag>;
+ let Documentation = [CodeSegDocs];
+}
+
def PragmaClangBSSSection : InheritableAttr {
// This attribute has no spellings as it is only ever created implicitly.
let Spellings = [];
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