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//===- IncludeTreePPActions.cpp - PP actions using include-tree -----------===//
//
// 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/Frontend/IncludeTreePPActions.h"
#include "clang/CAS/IncludeTree.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/PPCachedActions.h"
#include "clang/Lex/Preprocessor.h"
using namespace clang;
namespace {
struct IncludeStackInfo {
cas::IncludeTree Tree;
SourceLocation FileStartLoc;
unsigned CurIncludeIndex = 0;
unsigned CurHasIncludeCheckIndex = 0;
};
/// Uses the info from an \p IncludeTreeRoot to resolve include directives
/// and evaluate \p __has_include checks.
class IncludeTreePPActions final : public PPCachedActions {
cas::IncludeTree MainTree;
SmallVector<IncludeStackInfo> IncludeStack;
bool HasCASErrorOccurred = false;
void reportError(Preprocessor &PP, llvm::Error &&E) {
PP.getDiagnostics().Report(diag::err_unable_to_load_include_tree_node)
<< llvm::toString(std::move(E));
HasCASErrorOccurred = true;
}
public:
IncludeTreePPActions(cas::IncludeTree MainTree)
: MainTree(std::move(MainTree)) {}
FileID handlePredefines(Preprocessor &PP) override {
auto createEmptyFID = [&]() -> FileID {
llvm::MemoryBufferRef Buffer({}, "<built-in>");
return PP.getSourceManager().createFileID(Buffer);
};
if (HasCASErrorOccurred) {
return createEmptyFID();
}
auto reportError = [&](llvm::Error &&E) -> FileID {
this->reportError(PP, std::move(E));
return createEmptyFID();
};
SourceManager &SM = PP.getSourceManager();
SourceLocation MainFileLoc = SM.getLocForStartOfFile(SM.getMainFileID());
IncludeStack.push_back({std::move(MainTree), MainFileLoc});
IncludeStackInfo &IncludeInfo = IncludeStack.back();
Expected<cas::IncludeTree> EnteredTree =
IncludeInfo.Tree.getIncludeTree(IncludeInfo.CurIncludeIndex++);
if (!EnteredTree)
return reportError(EnteredTree.takeError());
auto FileInfo = EnteredTree->getBaseFileInfo();
if (!FileInfo)
return reportError(FileInfo.takeError());
llvm::MemoryBufferRef Buffer(FileInfo->Contents, FileInfo->Filename);
FileID FID = SM.createFileID(Buffer);
IncludeStack.push_back(
{std::move(*EnteredTree), SM.getLocForStartOfFile(FID)});
return FID;
}
bool evaluateHasInclude(Preprocessor &PP, SourceLocation Loc,
bool IsIncludeNext) override {
if (HasCASErrorOccurred)
return false;
IncludeStackInfo &IncludeInfo = IncludeStack.back();
unsigned Index = IncludeInfo.CurHasIncludeCheckIndex++;
return IncludeInfo.Tree.getCheckResult(Index);
}
std::variant<std::monostate, IncludeFile, IncludeModule, SpuriousImport>
handleIncludeDirective(Preprocessor &PP, SourceLocation IncludeLoc,
SourceLocation AfterDirectiveLoc) override {
if (HasCASErrorOccurred)
return {};
IncludeStackInfo &IncludeInfo = IncludeStack.back();
if (IncludeInfo.CurIncludeIndex >= IncludeInfo.Tree.getNumIncludes())
return {};
unsigned ExpectedOffset =
IncludeInfo.Tree.getIncludeOffset(IncludeInfo.CurIncludeIndex);
SourceLocation ExpectedLoc =
IncludeInfo.FileStartLoc.getLocWithOffset(ExpectedOffset);
if (ExpectedLoc != AfterDirectiveLoc)
return {};
auto reportError = [&](llvm::Error &&E) -> std::monostate {
this->reportError(PP, std::move(E));
return {};
};
auto reportErrorTwine = [&](const llvm::Twine &T) -> std::monostate {
return reportError(
llvm::createStringError(llvm::inconvertibleErrorCode(), T));
};
Expected<cas::IncludeTree::Node> Node =
IncludeInfo.Tree.getIncludeNode(IncludeInfo.CurIncludeIndex++);
if (!Node)
return reportError(Node.takeError());
auto MakeModuleImport = [&](cas::IncludeTree::ModuleImport Import) {
SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
SmallVector<StringRef, 2> ModuleComponents;
Import.getModuleName().split(ModuleComponents, '.');
for (StringRef Component : ModuleComponents)
Path.emplace_back(PP.getIdentifierInfo(Component), IncludeLoc);
return IncludeModule{std::move(Path), Import.visibilityOnly()};
};
auto MakeIncludeTree = [&](cas::IncludeTree EnteredTree)
-> std::variant<std::monostate, IncludeFile> {
auto File = EnteredTree.getBaseFile();
if (!File)
return reportError(File.takeError());
auto FilenameBlob = File->getFilename();
if (!FilenameBlob)
return reportError(FilenameBlob.takeError());
SourceManager &SM = PP.getSourceManager();
Expected<FileEntryRef> FE =
SM.getFileManager().getFileRef(FilenameBlob->getData(),
/*OpenFile=*/true);
if (!FE)
return reportError(FE.takeError());
FileID FID =
SM.createFileID(*FE, IncludeLoc, EnteredTree.getFileCharacteristic());
PP.markIncluded(*FE);
IncludeStack.push_back(
{std::move(EnteredTree), SM.getLocForStartOfFile(FID)});
Module *M = nullptr;
auto SubmoduleName = EnteredTree.getSubmoduleName();
if (!SubmoduleName)
return reportError(SubmoduleName.takeError());
if (*SubmoduleName) {
SmallVector<StringRef> ModuleComponents;
(*SubmoduleName)->split(ModuleComponents, '.');
M = PP.getHeaderSearchInfo().lookupModule(
ModuleComponents[0], IncludeLoc,
/*AllowSearch=*/false, /*AllowExtraModuleMapSearch=*/false);
if (!M)
return reportErrorTwine(llvm::Twine("failed to find module '") +
ModuleComponents[0] + "'");
for (StringRef Sub : ArrayRef(ModuleComponents).drop_front()) {
M = M->findOrInferSubmodule(Sub);
if (!M)
return reportErrorTwine(
llvm::Twine("failed to find or infer submodule '") + Sub + "'");
}
// Add to known headers for the module.
ModuleMap &MMap = PP.getHeaderSearchInfo().getModuleMap();
Module::Header H{"", "", *FE};
MMap.addHeader(M, std::move(H), ModuleMap::NormalHeader);
}
return IncludeFile{FID, M};
};
switch (Node->getKind()) {
case cas::IncludeTree::NodeKind::ModuleImport:
return MakeModuleImport(Node->getModuleImport());
case cas::IncludeTree::NodeKind::Tree: {
auto IncludeTree = MakeIncludeTree(Node->getIncludeTree());
if (std::holds_alternative<std::monostate>(IncludeTree))
return std::monostate{};
return std::get<IncludeFile>(IncludeTree);
}
case cas::IncludeTree::NodeKind::SpuriousImport: {
auto SpuriousImportNode = Node->getSpuriousImport();
auto ModuleImportNode = SpuriousImportNode.getModuleImport();
if (!ModuleImportNode)
return reportError(ModuleImportNode.takeError());
auto IncludeTreeNode = SpuriousImportNode.getIncludeTree();
if (!IncludeTreeNode)
return reportError(IncludeTreeNode.takeError());
auto ModuleImport = MakeModuleImport(*ModuleImportNode);
auto IncludeTree = MakeIncludeTree(*IncludeTreeNode);
if (std::holds_alternative<std::monostate>(IncludeTree))
return std::monostate{};
return SpuriousImport{ModuleImport, std::get<IncludeFile>(IncludeTree)};
}
}
}
void exitedFile(Preprocessor &PP, FileID FID) override {
if (HasCASErrorOccurred)
return;
assert(!IncludeStack.empty());
assert(IncludeStack.back().FileStartLoc ==
PP.getSourceManager().getLocForStartOfFile(FID));
assert(IncludeStack.back().CurIncludeIndex ==
IncludeStack.back().Tree.getNumIncludes());
IncludeStack.pop_back();
}
};
} // namespace
Expected<std::unique_ptr<PPCachedActions>>
clang::createPPActionsFromIncludeTree(cas::IncludeTreeRoot &Root) {
auto MainTree = Root.getMainFileTree();
if (!MainTree)
return MainTree.takeError();
return std::make_unique<IncludeTreePPActions>(std::move(*MainTree));
}
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