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fce31decdc22e061ff9d6edf6dfc1bc61320b977
swift-mirror/lib/Frontend/Frontend.cpp
Jordan Rose fce31decdc Serialize bridging headers into the merged module file. 
We do this so that the swiftmodule file contains all info necessary to
reconstruct the AST for debugging purposes. If the swiftmodule file is copied
into a dSYM bundle, it can (in theory) be used to debug a built app months
later. The header is processed with -frewrite-includes so that it includes
any non-modular content; the user will not have to recreate their project
structure and header maps to reload the AST.

There is some extra complexity here: a target with a bridging header
(such as a unit test target) may depend on another target with a bridging
header (such as an app target). This is a rare case, but one we'd like to
still keep working. However, if both bridging headers import some common.h,
we have a problem, because -frewrite-includes will lose the once-ness
of #import. Therefore, we /also/ store the path, size, and mtime of a
bridging header in the swiftmodule, and prefer to use a regular parse from
the original file if it can be located and hasn't been changed.

<rdar://problem/17688408>

Swift SVN r20128
2014-07-18 00:22:53 +00:00

473 lines
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//===-- Frontend.cpp - frontend utility methods ---------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file contains utility methods for parsing and performing semantic
// on modules.
//
//===----------------------------------------------------------------------===//
#include "swift/Frontend/Frontend.h"
#include "swift/Subsystems.h"
#include "swift/Strings.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/AST/Module.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Parse/DelayedParsingCallbacks.h"
#include "swift/Parse/Lexer.h"
#include "swift/SIL/SILModule.h"
#include "swift/Serialization/SerializedModuleLoader.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
using namespace swift;
void CompilerInstance::createSILModule() {
assert(getMainModule());
TheSILModule = SILModule::createEmptyModule(getMainModule());
}
void CompilerInstance::setTargetConfigurations(IRGenOptions &IRGenOpts,
LangOptions &LangOpts) {
llvm::Triple triple = llvm::Triple(IRGenOpts.Triple);
// Set the "os" target configuration.
if (triple.isMacOSX()) {
LangOpts.addTargetConfigOption("os", "OSX");
unsigned Major, Minor, Micro;
if (triple.getMacOSXVersion(Major, Minor, Micro) &&
(Major < 10 || (Major == 10 && Minor < 9)))
Diagnostics.diagnose(SourceLoc(), diag::error_os_minimum_deployment,
"OSX 10.9");
} else if (triple.isiOS()) {
LangOpts.addTargetConfigOption("os", "iOS");
unsigned Major, Minor, Micro;
triple.getiOSVersion(Major, Minor, Micro);
if (Major < 7)
Diagnostics.diagnose(SourceLoc(), diag::error_os_minimum_deployment,
"iOS 7");
} else {
assert(false && "Unsupported target OS");
}
// Set the "arch" target configuration.
switch (triple.getArch()) {
case llvm::Triple::ArchType::arm:
LangOpts.addTargetConfigOption("arch", "arm");
break;
case llvm::Triple::ArchType::arm64:
LangOpts.addTargetConfigOption("arch", "arm64");
break;
case llvm::Triple::ArchType::x86:
LangOpts.addTargetConfigOption("arch", "i386");
break;
case llvm::Triple::ArchType::x86_64:
LangOpts.addTargetConfigOption("arch", "x86_64");
break;
default:
llvm_unreachable("Unsupported target architecture");
}
}
bool CompilerInstance::setup(const CompilerInvocation &Invok) {
Invocation = Invok;
// Honor -Xllvm.
if (!Invok.getFrontendOptions().LLVMArgs.empty()) {
llvm::SmallVector<const char *, 4> Args;
Args.push_back("swift (LLVM option parsing)");
for (unsigned i = 0, e = Invok.getFrontendOptions().LLVMArgs.size(); i != e;
++i)
Args.push_back(Invok.getFrontendOptions().LLVMArgs[i].c_str());
Args.push_back(nullptr);
llvm::cl::ParseCommandLineOptions(Args.size()-1, Args.data());
}
if (Invocation.getDiagnosticOptions().ShowDiagnosticsAfterFatalError) {
Diagnostics.setShowDiagnosticsAfterFatalError();
}
// Initialize the target build configuration settings ("os" and "arch").
setTargetConfigurations(Invocation.getIRGenOptions(),
Invocation.getLangOptions());
// If we are asked to emit a module documentation file, configure lexing and
// parsing to remember comments.
if (!Invocation.getFrontendOptions().ModuleDocOutputPath.empty())
Invocation.getLangOptions().AttachCommentsToDecls = true;
Context.reset(new ASTContext(Invocation.getLangOptions(),
Invocation.getSearchPathOptions(),
SourceMgr, Diagnostics));
if (Invocation.getFrontendOptions().EnableSourceImport) {
bool immediate = Invocation.getFrontendOptions().actionIsImmediate();
Context->addModuleLoader(SourceLoader::create(*Context, !immediate,
DepTracker));
}
auto SML = SerializedModuleLoader::create(*Context, DepTracker);
this->SML = SML.get();
Context->addModuleLoader(std::move(SML));
// Wire up the Clang importer. If the user has specified an SDK, use it.
// Otherwise, we just keep it around as our interface to Clang's ABI
// knowledge.
auto clangImporter =
ClangImporter::create(*Context, Invocation.getClangImporterOptions(),
Invocation.getIRGenOptions(), DepTracker);
if (!clangImporter) {
Diagnostics.diagnose(SourceLoc(), diag::error_clang_importer_create_fail);
return true;
}
Context->addModuleLoader(std::move(clangImporter), /*isClang*/true);
assert(Lexer::isIdentifier(Invocation.getModuleName()));
auto CodeCompletePoint = Invocation.getCodeCompletionPoint();
if (CodeCompletePoint.first) {
auto MemBuf = CodeCompletePoint.first;
// CompilerInvocation doesn't own the buffers, copy to a new buffer.
unsigned CodeCompletionBufferID = SourceMgr.addMemBufferCopy(MemBuf);
BufferIDs.push_back(CodeCompletionBufferID);
SourceMgr.setCodeCompletionPoint(CodeCompletionBufferID,
CodeCompletePoint.second);
}
bool MainMode = (Invocation.getInputKind() == SourceFileKind::Main);
bool SILMode = (Invocation.getInputKind() == SourceFileKind::SIL);
const Optional<SelectedInput> &PrimaryInput =
Invocation.getFrontendOptions().PrimaryInput;
// Add the memory buffers first, these will be associated with a filename
// and they can replace the contents of an input filename.
for (unsigned i = 0, e = Invocation.getInputBuffers().size(); i != e; ++i) {
// CompilerInvocation doesn't own the buffers, copy to a new buffer.
auto *InputBuffer = Invocation.getInputBuffers()[i];
auto *Copy = llvm::MemoryBuffer::getMemBufferCopy(
InputBuffer->getBuffer(), InputBuffer->getBufferIdentifier());
if (SerializedModuleLoader::isSerializedAST(Copy->getBuffer())) {
PartialModules.push_back({ std::unique_ptr<llvm::MemoryBuffer>(Copy),
nullptr });
} else {
unsigned BufferID = SourceMgr.addNewSourceBuffer(Copy);
BufferIDs.push_back(BufferID);
if (SILMode)
MainBufferID = BufferID;
if (PrimaryInput && PrimaryInput->isBuffer() && PrimaryInput->Index == i)
PrimaryBufferID = BufferID;
}
}
for (unsigned i = 0, e = Invocation.getInputFilenames().size(); i != e; ++i) {
auto &File = Invocation.getInputFilenames()[i];
if (DepTracker)
DepTracker->addDependency(File);
// FIXME: Working with filenames is fragile, maybe use the real path
// or have some kind of FileManager.
using namespace llvm::sys::path;
if (Optional<unsigned> ExistingBufferID =
SourceMgr.getIDForBufferIdentifier(File)) {
if (SILMode || (MainMode && filename(File) == "main.swift"))
MainBufferID = ExistingBufferID.getValue();
if (PrimaryInput && PrimaryInput->isFilename() &&
PrimaryInput->Index == i)
PrimaryBufferID = ExistingBufferID.getValue();
continue; // replaced by a memory buffer.
}
// Open the input file.
using FileOrError = llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>;
FileOrError InputFileOrErr = llvm::MemoryBuffer::getFileOrSTDIN(File);
if (!InputFileOrErr) {
Diagnostics.diagnose(SourceLoc(), diag::error_open_input_file,
File, InputFileOrErr.getError().message());
return true;
}
if (SerializedModuleLoader::isSerializedAST(
InputFileOrErr.get()->getBuffer())) {
llvm::SmallString<128> ModuleDocFilePath(File);
llvm::sys::path::replace_extension(ModuleDocFilePath,
SERIALIZED_MODULE_DOC_EXTENSION);
FileOrError ModuleDocOrErr =
llvm::MemoryBuffer::getFileOrSTDIN(ModuleDocFilePath);
if (!ModuleDocOrErr &&
ModuleDocOrErr.getError() != std::errc::no_such_file_or_directory) {
Diagnostics.diagnose(SourceLoc(), diag::error_open_input_file,
File, ModuleDocOrErr.getError().message());
return true;
}
PartialModules.push_back({ std::move(InputFileOrErr.get()),
ModuleDocOrErr? std::move(ModuleDocOrErr.get())
: nullptr });
continue;
}
// Transfer ownership of the MemoryBuffer to the SourceMgr.
unsigned BufferID =
SourceMgr.addNewSourceBuffer(std::move(InputFileOrErr.get()));
BufferIDs.push_back(BufferID);
if (SILMode || (MainMode && filename(File) == "main.swift"))
MainBufferID = BufferID;
if (PrimaryInput && PrimaryInput->isFilename() && PrimaryInput->Index == i)
PrimaryBufferID = BufferID;
}
if (MainMode && MainBufferID == NO_SUCH_BUFFER && BufferIDs.size() == 1)
MainBufferID = BufferIDs.front();
return false;
}
void CompilerInstance::performSema() {
const SourceFileKind Kind = Invocation.getInputKind();
Identifier ID = Context->getIdentifier(Invocation.getModuleName());
MainModule = Module::create(ID, *Context);
Context->LoadedModules[ID.str()] = MainModule;
auto modImpKind = SourceFile::ImplicitModuleImportKind::Stdlib;
if (Kind == SourceFileKind::SIL) {
assert(BufferIDs.size() == 1);
assert(MainBufferID != NO_SUCH_BUFFER);
createSILModule();
modImpKind = SourceFile::ImplicitModuleImportKind::None;
} else if (Invocation.getParseStdlib()) {
modImpKind = SourceFile::ImplicitModuleImportKind::Builtin;
}
switch (modImpKind) {
case SourceFile::ImplicitModuleImportKind::None:
case SourceFile::ImplicitModuleImportKind::Builtin:
break;
case SourceFile::ImplicitModuleImportKind::Stdlib:
if (!Context->getStdlibModule(true)) {
Diagnostics.diagnose(SourceLoc(), diag::error_stdlib_not_found,
Invocation.getTargetTriple());
return;
}
break;
}
auto clangImporter =
static_cast<ClangImporter *>(Context->getClangModuleLoader());
Module *underlying = nullptr;
if (Invocation.getFrontendOptions().ImportUnderlyingModule) {
underlying = clangImporter->loadModule(SourceLoc(),
std::make_pair(ID, SourceLoc()));
if (!underlying) {
Diagnostics.diagnose(SourceLoc(), diag::error_underlying_module_not_found,
ID);
}
}
Module *importedHeaderModule = nullptr;
StringRef implicitHeaderPath =
Invocation.getFrontendOptions().ImplicitObjCHeaderPath;
if (!implicitHeaderPath.empty()) {
clangImporter->importBridgingHeader(implicitHeaderPath, MainModule);
importedHeaderModule = clangImporter->getImportedHeaderModule();
assert(importedHeaderModule);
}
auto addAdditionalInitialImports = [&](SourceFile *SF) {
if (!underlying && !importedHeaderModule)
return;
auto initialImports = SF->getImports(/*allowUnparsed=*/true);
using ImportPair = std::pair<Module::ImportedModule, bool>;
SmallVector<ImportPair, 4> initialImportsBuf{
initialImports.begin(), initialImports.end()
};
if (underlying)
initialImportsBuf.push_back({ { /*accessPath=*/{}, underlying },
/*exported=*/false });
if (importedHeaderModule)
initialImportsBuf.push_back({ { /*accessPath=*/{}, importedHeaderModule },
/*exported=*/true });
SF->setImports(Context->AllocateCopy(initialImportsBuf));
};
if (Kind == SourceFileKind::REPL) {
auto *SingleInputFile =
new (*Context) SourceFile(*MainModule, Kind, {}, modImpKind);
MainModule->addFile(*SingleInputFile);
addAdditionalInitialImports(SingleInputFile);
return;
}
std::unique_ptr<DelayedParsingCallbacks> DelayedCB;
if (Invocation.isCodeCompletion()) {
DelayedCB.reset(
new CodeCompleteDelayedCallbacks(SourceMgr.getCodeCompletionLoc()));
} else if (Invocation.isDelayedFunctionBodyParsing()) {
DelayedCB.reset(new AlwaysDelayedCallbacks);
}
PersistentParserState PersistentState;
// Make sure the main file is the first file in the module. This may only be
// a source file, or it may be a SIL file, which requires pumping the parser.
// We parse it last, though, to make sure that it can use decls from other
// files in the module.
if (MainBufferID != NO_SUCH_BUFFER) {
assert(Kind == SourceFileKind::Main || Kind == SourceFileKind::SIL);
if (Kind == SourceFileKind::Main)
SourceMgr.setHashbangBufferID(MainBufferID);
auto *MainFile = new (*Context) SourceFile(*MainModule, Kind, MainBufferID,
modImpKind);
MainModule->addFile(*MainFile);
addAdditionalInitialImports(MainFile);
if (MainBufferID == PrimaryBufferID)
PrimarySourceFile = MainFile;
}
bool hadLoadError = false;
// Parse all the partial modules first.
for (auto &PM : PartialModules) {
assert(PM.ModuleBuffer);
if (!SML->loadAST(*MainModule, SourceLoc(), std::move(PM.ModuleBuffer),
std::move(PM.ModuleDocBuffer)))
hadLoadError = true;
}
// Then parse all the library files.
for (auto BufferID : BufferIDs) {
if (BufferID == MainBufferID)
continue;
auto *NextInput = new (*Context) SourceFile(*MainModule,
SourceFileKind::Library,
BufferID,
modImpKind);
MainModule->addFile(*NextInput);
addAdditionalInitialImports(NextInput);
if (BufferID == PrimaryBufferID)
PrimarySourceFile = NextInput;
bool Done;
parseIntoSourceFile(*NextInput, BufferID, &Done, nullptr,
&PersistentState, DelayedCB.get());
assert(Done && "Parser returned early?");
(void) Done;
performNameBinding(*NextInput);
}
if (Invocation.isCodeCompletion()) {
// When we are doing code completion, make sure to emit at least one
// diagnostic, so that ASTContext is marked as erroneous. In this case
// various parts of the compiler (for example, AST verifier) have less
// strict assumptions about the AST.
Diagnostics.diagnose(SourceLoc(), diag::error_doing_code_completion);
}
if (hadLoadError)
return;
// Parse the main file last.
if (MainBufferID != NO_SUCH_BUFFER) {
SourceFile &MainFile = MainModule->getMainSourceFile(Kind);
SILParserState SILContext(TheSILModule.get());
unsigned CurTUElem = 0;
bool Done;
do {
// Pump the parser multiple times if necessary. It will return early
// after parsing any top level code in a main module, or in SIL mode when
// there are chunks of swift decls (e.g. imports and types) interspersed
// with 'sil' definitions.
parseIntoSourceFile(MainFile, MainFile.getBufferID().getValue(), &Done,
TheSILModule ? &SILContext : nullptr,
&PersistentState, DelayedCB.get());
if (PrimaryBufferID == NO_SUCH_BUFFER || MainBufferID == PrimaryBufferID)
performTypeChecking(MainFile, PersistentState.getTopLevelContext(),
CurTUElem);
CurTUElem = MainFile.Decls.size();
} while (!Done);
if (Invocation.getFrontendOptions().Playground)
performPlaygroundTransform(MainFile);
}
// Type-check each top-level input besides the main source file.
for (auto File : MainModule->getFiles())
if (auto SF = dyn_cast<SourceFile>(File))
if (PrimaryBufferID == NO_SUCH_BUFFER || SF == PrimarySourceFile)
performTypeChecking(*SF, PersistentState.getTopLevelContext());
// Even if there were no source files, we should still record known
// protocols.
if (auto *stdlib = Context->getStdlibModule())
Context->recordKnownProtocols(stdlib);
if (DelayedCB) {
performDelayedParsing(MainModule, PersistentState,
Invocation.getCodeCompletionFactory());
}
}
void CompilerInstance::performParseOnly() {
const SourceFileKind Kind = Invocation.getInputKind();
Identifier ID = Context->getIdentifier(Invocation.getModuleName());
MainModule = Module::create(ID, *Context);
Context->LoadedModules[ID.str()] = MainModule;
assert(Kind == SourceFileKind::Main || Kind == SourceFileKind::Library);
assert(BufferIDs.size() == 1 && "only supports parsing a single file");
if (Kind == SourceFileKind::Main)
SourceMgr.setHashbangBufferID(BufferIDs[0]);
auto *Input = new (*Context) SourceFile(*MainModule,
Kind,
BufferIDs[0],
SourceFile::ImplicitModuleImportKind::None);
MainModule->addFile(*Input);
PrimarySourceFile = Input;
PersistentParserState PersistentState;
bool Done;
do {
// Pump the parser multiple times if necessary. It will return early
// after parsing any top level code in a main module.
parseIntoSourceFile(*Input, Input->getBufferID().getValue(), &Done,
nullptr, &PersistentState, nullptr);
} while (!Done);
assert(Context->LoadedModules.size() == 1 &&
"Loaded a module during parse-only");
}
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