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llvm-project/clang/lib/Frontend/InterfaceStubFunctionsConsu...

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//===--- InterfaceStubFunctionsConsumer.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Mangle.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Sema/TemplateInstCallback.h"
#include "llvm/BinaryFormat/ELF.h"
using namespace clang;
namespace {
class InterfaceStubFunctionsConsumer : public ASTConsumer {
CompilerInstance &Instance;
StringRef InFile;
StringRef Format;
std::set<std::string> ParsedTemplates;
enum RootDeclOrigin { TopLevel = 0, FromTU = 1, IsLate = 2 };
struct MangledSymbol {
std::string ParentName;
uint8_t Type;
uint8_t Binding;
std::vector<std::string> Names;
MangledSymbol() = delete;
MangledSymbol(const std::string &ParentName, uint8_t Type, uint8_t Binding,
std::vector<std::string> Names)
: ParentName(ParentName), Type(Type), Binding(Binding), Names(Names) {}
};
using MangledSymbols = std::map<const NamedDecl *, MangledSymbol>;
bool WriteNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
// Here we filter out anything that's not set to DefaultVisibility.
// DefaultVisibility is set on a decl when -fvisibility is not specified on
// the command line (or specified as default) and the decl does not have
// __attribute__((visibility("hidden"))) set or when the command line
// argument is set to hidden but the decl explicitly has
// __attribute__((visibility ("default"))) set. We do this so that the user
// can have fine grain control of what they want to expose in the stub.
auto isVisible = [](const NamedDecl *ND) -> bool {
return ND->getVisibility() == DefaultVisibility;
};
auto ignoreDecl = [this, isVisible](const NamedDecl *ND) -> bool {
if (!isVisible(ND))
return true;
if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
if (const auto *Parent = VD->getParentFunctionOrMethod())
if (isa<BlockDecl>(Parent) || isa<CXXMethodDecl>(Parent))
return true;
if ((VD->getStorageClass() == StorageClass::SC_Extern) ||
(VD->getStorageClass() == StorageClass::SC_Static &&
VD->getParentFunctionOrMethod() == nullptr))
return true;
}
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
if (FD->isInlined() && !isa<CXXMethodDecl>(FD) &&
!Instance.getLangOpts().GNUInline)
return true;
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
if (const auto *RC = dyn_cast<CXXRecordDecl>(MD->getParent()))
if (isa<ClassTemplateDecl>(RC->getParent()) || !isVisible(RC))
return true;
if (MD->isDependentContext() || !MD->hasBody())
return true;
}
if (FD->getStorageClass() == StorageClass::SC_Static)
return true;
}
return false;
};
auto getParentFunctionDecl = [](const NamedDecl *ND) -> const NamedDecl * {
if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
if (const auto *FD =
dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod()))
return FD;
return nullptr;
};
auto getMangledNames = [](const NamedDecl *ND) -> std::vector<std::string> {
if (!ND)
return {""};
ASTNameGenerator NameGen(ND->getASTContext());
std::vector<std::string> MangledNames = NameGen.getAllManglings(ND);
if (isa<CXXConstructorDecl>(ND) || isa<CXXDestructorDecl>(ND))
return MangledNames;
#ifdef EXPENSIVE_CHECKS
assert(MangledNames.size() <= 1 && "Expected only one name mangling.");
#endif
return {NameGen.getName(ND)};
};
if (!(RDO & FromTU))
return true;
if (Symbols.find(ND) != Symbols.end())
return true;
// - Currently have not figured out how to produce the names for FieldDecls.
// - Do not want to produce symbols for function paremeters.
if (isa<FieldDecl>(ND) || isa<ParmVarDecl>(ND))
return true;
const NamedDecl *ParentDecl = getParentFunctionDecl(ND);
if ((ParentDecl && ignoreDecl(ParentDecl)) || ignoreDecl(ND))
return true;
if (RDO & IsLate) {
Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
<< "Generating Interface Stubs is not supported with "
"delayed template parsing.";
} else {
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
if (FD->isDependentContext())
return true;
const bool IsWeak = (ND->hasAttr<WeakAttr>() ||
ND->hasAttr<WeakRefAttr>() || ND->isWeakImported());
Symbols.insert(std::make_pair(
ND,
MangledSymbol(getMangledNames(ParentDecl).front(),
// Type:
isa<VarDecl>(ND) ? llvm::ELF::STT_OBJECT
: llvm::ELF::STT_FUNC,
// Binding:
IsWeak ? llvm::ELF::STB_WEAK : llvm::ELF::STB_GLOBAL,
getMangledNames(ND))));
}
return true;
}
void
HandleDecls(const llvm::iterator_range<DeclContext::decl_iterator> &Decls,
MangledSymbols &Symbols, int RDO) {
for (const auto *D : Decls)
HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
}
void HandleTemplateSpecializations(const FunctionTemplateDecl &FTD,
MangledSymbols &Symbols, int RDO) {
for (const auto *D : FTD.specializations())
HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
}
void HandleTemplateSpecializations(const ClassTemplateDecl &CTD,
MangledSymbols &Symbols, int RDO) {
for (const auto *D : CTD.specializations())
HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
}
bool HandleNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
if (!ND)
return false;
switch (ND->getKind()) {
default:
break;
case Decl::Kind::Namespace:
HandleDecls(cast<NamespaceDecl>(ND)->decls(), Symbols, RDO);
return true;
case Decl::Kind::CXXRecord:
HandleDecls(cast<CXXRecordDecl>(ND)->decls(), Symbols, RDO);
return true;
case Decl::Kind::ClassTemplateSpecialization:
HandleDecls(cast<ClassTemplateSpecializationDecl>(ND)->decls(), Symbols,
RDO);
return true;
case Decl::Kind::ClassTemplate:
HandleTemplateSpecializations(*cast<ClassTemplateDecl>(ND), Symbols, RDO);
return true;
case Decl::Kind::FunctionTemplate:
HandleTemplateSpecializations(*cast<FunctionTemplateDecl>(ND), Symbols,
RDO);
return true;
case Decl::Kind::Record:
case Decl::Kind::Typedef:
case Decl::Kind::Enum:
case Decl::Kind::EnumConstant:
case Decl::Kind::TemplateTypeParm:
case Decl::Kind::NonTypeTemplateParm:
case Decl::Kind::CXXConversion:
case Decl::Kind::UnresolvedUsingValue:
case Decl::Kind::Using:
case Decl::Kind::UsingShadow:
case Decl::Kind::TypeAliasTemplate:
case Decl::Kind::TypeAlias:
case Decl::Kind::VarTemplate:
case Decl::Kind::VarTemplateSpecialization:
case Decl::Kind::UsingDirective:
case Decl::Kind::TemplateTemplateParm:
case Decl::Kind::ClassTemplatePartialSpecialization:
case Decl::Kind::IndirectField:
case Decl::Kind::ConstructorUsingShadow:
case Decl::Kind::CXXDeductionGuide:
case Decl::Kind::NamespaceAlias:
case Decl::Kind::UnresolvedUsingTypename:
return true;
case Decl::Kind::Var: {
// Bail on any VarDecl that either has no named symbol.
if (!ND->getIdentifier())
return true;
const auto *VD = cast<VarDecl>(ND);
// Bail on any VarDecl that is a dependent or templated type.
if (VD->isTemplated() || VD->getType()->isDependentType())
return true;
if (WriteNamedDecl(ND, Symbols, RDO))
return true;
break;
}
case Decl::Kind::ParmVar:
case Decl::Kind::CXXMethod:
case Decl::Kind::CXXConstructor:
case Decl::Kind::CXXDestructor:
case Decl::Kind::Function:
case Decl::Kind::Field:
if (WriteNamedDecl(ND, Symbols, RDO))
return true;
}
// While interface stubs are in the development stage, it's probably best to
// catch anything that's not a VarDecl or Template/FunctionDecl.
Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
<< "Expected a function or function template decl.";
return false;
}
public:
InterfaceStubFunctionsConsumer(CompilerInstance &Instance, StringRef InFile,
StringRef Format)
: Instance(Instance), InFile(InFile), Format(Format) {}
void HandleTranslationUnit(ASTContext &context) override {
struct Visitor : public RecursiveASTVisitor<Visitor> {
bool VisitNamedDecl(NamedDecl *ND) {
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
if (FD->isLateTemplateParsed()) {
LateParsedDecls.insert(FD);
return true;
}
if (const auto *VD = dyn_cast<ValueDecl>(ND)) {
ValueDecls.insert(VD);
return true;
}
NamedDecls.insert(ND);
return true;
}
std::set<const NamedDecl *> LateParsedDecls;
std::set<NamedDecl *> NamedDecls;
std::set<const ValueDecl *> ValueDecls;
} v;
v.TraverseDecl(context.getTranslationUnitDecl());
MangledSymbols Symbols;
auto OS = Instance.createDefaultOutputFile(/*Binary=*/false, InFile, "ifs");
if (!OS)
return;
if (Instance.getLangOpts().DelayedTemplateParsing) {
clang::Sema &S = Instance.getSema();
for (const auto *FD : v.LateParsedDecls) {
clang::LateParsedTemplate &LPT =
*S.LateParsedTemplateMap.find(cast<FunctionDecl>(FD))->second;
S.LateTemplateParser(S.OpaqueParser, LPT);
HandleNamedDecl(FD, Symbols, (FromTU | IsLate));
}
}
for (const NamedDecl *ND : v.ValueDecls)
HandleNamedDecl(ND, Symbols, FromTU);
for (const NamedDecl *ND : v.NamedDecls)
HandleNamedDecl(ND, Symbols, FromTU);
auto writeIfsV1 = [this](const llvm::Triple &T,
const MangledSymbols &Symbols,
const ASTContext &context, StringRef Format,
raw_ostream &OS) -> void {
OS << "--- !" << Format << "\n";
OS << "IfsVersion: 2.0\n";
OS << "Triple: " << T.str() << "\n";
OS << "ObjectFileFormat: "
<< "ELF"
<< "\n"; // TODO: For now, just ELF.
OS << "Symbols:\n";
for (const auto &E : Symbols) {
const MangledSymbol &Symbol = E.second;
for (auto Name : Symbol.Names) {
OS << " - { Name: \""
<< (Symbol.ParentName.empty() || Instance.getLangOpts().CPlusPlus
? ""
: (Symbol.ParentName + "."))
<< Name << "\", Type: ";
switch (Symbol.Type) {
default:
llvm_unreachable(
"clang -emit-interface-stubs: Unexpected symbol type.");
case llvm::ELF::STT_NOTYPE:
OS << "NoType";
break;
case llvm::ELF::STT_OBJECT: {
auto VD = cast<ValueDecl>(E.first)->getType();
OS << "Object, Size: "
<< context.getTypeSizeInChars(VD).getQuantity();
break;
}
case llvm::ELF::STT_FUNC:
OS << "Func";
break;
}
if (Symbol.Binding == llvm::ELF::STB_WEAK)
OS << ", Weak: true";
OS << " }\n";
}
}
OS << "...\n";
OS.flush();
};
assert(Format == "experimental-ifs-v2" && "Unexpected IFS Format.");
writeIfsV1(Instance.getTarget().getTriple(), Symbols, context, Format, *OS);
}
};
} // namespace
std::unique_ptr<ASTConsumer>
GenerateInterfaceStubsAction::CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) {
return std::make_unique<InterfaceStubFunctionsConsumer>(
CI, InFile, "experimental-ifs-v2");
}
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