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