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+//===-- driver.cpp - Clang GCC-Compatible Driver --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is the entry point to the clang driver; it is a thin wrapper
+// for functionality in the Driver clang library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Driver/ArgList.h"
+#include "clang/Driver/CC1Options.h"
+#include "clang/Driver/Compilation.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Option.h"
+#include "clang/Driver/OptTable.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/DiagnosticOptions.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Frontend/Utils.h"
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Regex.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/system_error.h"
+#include <cctype>
+using namespace clang;
+using namespace clang::driver;
+
+llvm::sys::Path GetExecutablePath(const char *Argv0, bool CanonicalPrefixes) {
+ if (!CanonicalPrefixes)
+ return llvm::sys::Path(Argv0);
+
+ // This just needs to be some symbol in the binary; C++ doesn't
+ // allow taking the address of ::main however.
+ void *P = (void*) (intptr_t) GetExecutablePath;
+ return llvm::sys::Path::GetMainExecutable(Argv0, P);
+}
+
+static const char *SaveStringInSet(std::set<std::string> &SavedStrings,
+ StringRef S) {
+ return SavedStrings.insert(S).first->c_str();
+}
+
+/// ApplyQAOverride - Apply a list of edits to the input argument lists.
+///
+/// The input string is a space separate list of edits to perform,
+/// they are applied in order to the input argument lists. Edits
+/// should be one of the following forms:
+///
+/// '#': Silence information about the changes to the command line arguments.
+///
+/// '^': Add FOO as a new argument at the beginning of the command line.
+///
+/// '+': Add FOO as a new argument at the end of the command line.
+///
+/// 's/XXX/YYY/': Substitute the regular expression XXX with YYY in the command
+/// line.
+///
+/// 'xOPTION': Removes all instances of the literal argument OPTION.
+///
+/// 'XOPTION': Removes all instances of the literal argument OPTION,
+/// and the following argument.
+///
+/// 'Ox': Removes all flags matching 'O' or 'O[sz0-9]' and adds 'Ox'
+/// at the end of the command line.
+///
+/// \param OS - The stream to write edit information to.
+/// \param Args - The vector of command line arguments.
+/// \param Edit - The override command to perform.
+/// \param SavedStrings - Set to use for storing string representations.
+static void ApplyOneQAOverride(raw_ostream &OS,
+ SmallVectorImpl<const char*> &Args,
+ StringRef Edit,
+ std::set<std::string> &SavedStrings) {
+ // This does not need to be efficient.
+
+ if (Edit[0] == '^') {
+ const char *Str =
+ SaveStringInSet(SavedStrings, Edit.substr(1));
+ OS << "### Adding argument " << Str << " at beginning\n";
+ Args.insert(Args.begin() + 1, Str);
+ } else if (Edit[0] == '+') {
+ const char *Str =
+ SaveStringInSet(SavedStrings, Edit.substr(1));
+ OS << "### Adding argument " << Str << " at end\n";
+ Args.push_back(Str);
+ } else if (Edit[0] == 's' && Edit[1] == '/' && Edit.endswith("/") &&
+ Edit.slice(2, Edit.size()-1).find('/') != StringRef::npos) {
+ StringRef MatchPattern = Edit.substr(2).split('/').first;
+ StringRef ReplPattern = Edit.substr(2).split('/').second;
+ ReplPattern = ReplPattern.slice(0, ReplPattern.size()-1);
+
+ for (unsigned i = 1, e = Args.size(); i != e; ++i) {
+ std::string Repl = llvm::Regex(MatchPattern).sub(ReplPattern, Args[i]);
+
+ if (Repl != Args[i]) {
+ OS << "### Replacing '" << Args[i] << "' with '" << Repl << "'\n";
+ Args[i] = SaveStringInSet(SavedStrings, Repl);
+ }
+ }
+ } else if (Edit[0] == 'x' || Edit[0] == 'X') {
+ std::string Option = Edit.substr(1, std::string::npos);
+ for (unsigned i = 1; i < Args.size();) {
+ if (Option == Args[i]) {
+ OS << "### Deleting argument " << Args[i] << '\n';
+ Args.erase(Args.begin() + i);
+ if (Edit[0] == 'X') {
+ if (i < Args.size()) {
+ OS << "### Deleting argument " << Args[i] << '\n';
+ Args.erase(Args.begin() + i);
+ } else
+ OS << "### Invalid X edit, end of command line!\n";
+ }
+ } else
+ ++i;
+ }
+ } else if (Edit[0] == 'O') {
+ for (unsigned i = 1; i < Args.size();) {
+ const char *A = Args[i];
+ if (A[0] == '-' && A[1] == 'O' &&
+ (A[2] == '\0' ||
+ (A[3] == '\0' && (A[2] == 's' || A[2] == 'z' ||
+ ('0' <= A[2] && A[2] <= '9'))))) {
+ OS << "### Deleting argument " << Args[i] << '\n';
+ Args.erase(Args.begin() + i);
+ } else
+ ++i;
+ }
+ OS << "### Adding argument " << Edit << " at end\n";
+ Args.push_back(SaveStringInSet(SavedStrings, '-' + Edit.str()));
+ } else {
+ OS << "### Unrecognized edit: " << Edit << "\n";
+ }
+}
+
+/// ApplyQAOverride - Apply a comma separate list of edits to the
+/// input argument lists. See ApplyOneQAOverride.
+static void ApplyQAOverride(SmallVectorImpl<const char*> &Args,
+ const char *OverrideStr,
+ std::set<std::string> &SavedStrings) {
+ raw_ostream *OS = &llvm::errs();
+
+ if (OverrideStr[0] == '#') {
+ ++OverrideStr;
+ OS = &llvm::nulls();
+ }
+
+ *OS << "### QA_OVERRIDE_GCC3_OPTIONS: " << OverrideStr << "\n";
+
+ // This does not need to be efficient.
+
+ const char *S = OverrideStr;
+ while (*S) {
+ const char *End = ::strchr(S, ' ');
+ if (!End)
+ End = S + strlen(S);
+ if (End != S)
+ ApplyOneQAOverride(*OS, Args, std::string(S, End), SavedStrings);
+ S = End;
+ if (*S != '\0')
+ ++S;
+ }
+}
+
+extern int cc1_main(const char **ArgBegin, const char **ArgEnd,
+ const char *Argv0, void *MainAddr);
+extern int cc1as_main(const char **ArgBegin, const char **ArgEnd,
+ const char *Argv0, void *MainAddr);
+
+static void ExpandArgsFromBuf(const char *Arg,
+ SmallVectorImpl<const char*> &ArgVector,
+ std::set<std::string> &SavedStrings) {
+ const char *FName = Arg + 1;
+ OwningPtr<llvm::MemoryBuffer> MemBuf;
+ if (llvm::MemoryBuffer::getFile(FName, MemBuf)) {
+ ArgVector.push_back(SaveStringInSet(SavedStrings, Arg));
+ return;
+ }
+
+ const char *Buf = MemBuf->getBufferStart();
+ char InQuote = ' ';
+ std::string CurArg;
+
+ for (const char *P = Buf; ; ++P) {
+ if (*P == '\0' || (isspace(*P) && InQuote == ' ')) {
+ if (!CurArg.empty()) {
+
+ if (CurArg[0] != '@') {
+ ArgVector.push_back(SaveStringInSet(SavedStrings, CurArg));
+ } else {
+ ExpandArgsFromBuf(CurArg.c_str(), ArgVector, SavedStrings);
+ }
+
+ CurArg = "";
+ }
+ if (*P == '\0')
+ break;
+ else
+ continue;
+ }
+
+ if (isspace(*P)) {
+ if (InQuote != ' ')
+ CurArg.push_back(*P);
+ continue;
+ }
+
+ if (*P == '"' || *P == '\'') {
+ if (InQuote == *P)
+ InQuote = ' ';
+ else if (InQuote == ' ')
+ InQuote = *P;
+ else
+ CurArg.push_back(*P);
+ continue;
+ }
+
+ if (*P == '\\') {
+ ++P;
+ if (*P != '\0')
+ CurArg.push_back(*P);
+ continue;
+ }
+ CurArg.push_back(*P);
+ }
+}
+
+static void ExpandArgv(int argc, const char **argv,
+ SmallVectorImpl<const char*> &ArgVector,
+ std::set<std::string> &SavedStrings) {
+ for (int i = 0; i < argc; ++i) {
+ const char *Arg = argv[i];
+ if (Arg[0] != '@') {
+ ArgVector.push_back(SaveStringInSet(SavedStrings, std::string(Arg)));
+ continue;
+ }
+
+ ExpandArgsFromBuf(Arg, ArgVector, SavedStrings);
+ }
+}
+
+static void ParseProgName(SmallVectorImpl<const char *> &ArgVector,
+ std::set<std::string> &SavedStrings,
+ Driver &TheDriver)
+{
+ // Try to infer frontend type and default target from the program name.
+
+ // suffixes[] contains the list of known driver suffixes.
+ // Suffixes are compared against the program name in order.
+ // If there is a match, the frontend type is updated as necessary (CPP/C++).
+ // If there is no match, a second round is done after stripping the last
+ // hyphen and everything following it. This allows using something like
+ // "clang++-2.9".
+
+ // If there is a match in either the first or second round,
+ // the function tries to identify a target as prefix. E.g.
+ // "x86_64-linux-clang" as interpreted as suffix "clang" with
+ // target prefix "x86_64-linux". If such a target prefix is found,
+ // is gets added via -target as implicit first argument.
+ static const struct {
+ const char *Suffix;
+ bool IsCXX;
+ bool IsCPP;
+ } suffixes [] = {
+ { "clang", false, false },
+ { "clang++", true, false },
+ { "clang-c++", true, false },
+ { "clang-cc", false, false },
+ { "clang-cpp", false, true },
+ { "clang-g++", true, false },
+ { "clang-gcc", false, false },
+ { "cc", false, false },
+ { "cpp", false, true },
+ { "++", true, false },
+ };
+ std::string ProgName(llvm::sys::path::stem(ArgVector[0]));
+ StringRef ProgNameRef(ProgName);
+ StringRef Prefix;
+
+ for (int Components = 2; Components; --Components) {
+ bool FoundMatch = false;
+ size_t i;
+
+ for (i = 0; i < sizeof(suffixes) / sizeof(suffixes[0]); ++i) {
+ if (ProgNameRef.endswith(suffixes[i].Suffix)) {
+ FoundMatch = true;
+ if (suffixes[i].IsCXX)
+ TheDriver.CCCIsCXX = true;
+ if (suffixes[i].IsCPP)
+ TheDriver.CCCIsCPP = true;
+ break;
+ }
+ }
+
+ if (FoundMatch) {
+ StringRef::size_type LastComponent = ProgNameRef.rfind('-',
+ ProgNameRef.size() - strlen(suffixes[i].Suffix));
+ if (LastComponent != StringRef::npos)
+ Prefix = ProgNameRef.slice(0, LastComponent);
+ break;
+ }
+
+ StringRef::size_type LastComponent = ProgNameRef.rfind('-');
+ if (LastComponent == StringRef::npos)
+ break;
+ ProgNameRef = ProgNameRef.slice(0, LastComponent);
+ }
+
+ if (Prefix.empty())
+ return;
+
+ std::string IgnoredError;
+ if (llvm::TargetRegistry::lookupTarget(Prefix, IgnoredError)) {
+ SmallVectorImpl<const char *>::iterator it = ArgVector.begin();
+ if (it != ArgVector.end())
+ ++it;
+ ArgVector.insert(it, SaveStringInSet(SavedStrings, Prefix));
+ ArgVector.insert(it,
+ SaveStringInSet(SavedStrings, std::string("-target")));
+ }
+}
+
+int main(int argc_, const char **argv_) {
+ llvm::sys::PrintStackTraceOnErrorSignal();
+ llvm::PrettyStackTraceProgram X(argc_, argv_);
+
+ std::set<std::string> SavedStrings;
+ SmallVector<const char*, 256> argv;
+
+ ExpandArgv(argc_, argv_, argv, SavedStrings);
+
+ // Handle -cc1 integrated tools.
+ if (argv.size() > 1 && StringRef(argv[1]).startswith("-cc1")) {
+ StringRef Tool = argv[1] + 4;
+
+ if (Tool == "")
+ return cc1_main(argv.data()+2, argv.data()+argv.size(), argv[0],
+ (void*) (intptr_t) GetExecutablePath);
+ if (Tool == "as")
+ return cc1as_main(argv.data()+2, argv.data()+argv.size(), argv[0],
+ (void*) (intptr_t) GetExecutablePath);
+
+ // Reject unknown tools.
+ llvm::errs() << "error: unknown integrated tool '" << Tool << "'\n";
+ return 1;
+ }
+
+ bool CanonicalPrefixes = true;
+ for (int i = 1, size = argv.size(); i < size; ++i) {
+ if (StringRef(argv[i]) == "-no-canonical-prefixes") {
+ CanonicalPrefixes = false;
+ break;
+ }
+ }
+
+ llvm::sys::Path Path = GetExecutablePath(argv[0], CanonicalPrefixes);
+
+ DiagnosticOptions DiagOpts;
+ {
+ // Note that ParseDiagnosticArgs() uses the cc1 option table.
+ OwningPtr<OptTable> CC1Opts(createCC1OptTable());
+ unsigned MissingArgIndex, MissingArgCount;
+ OwningPtr<InputArgList> Args(CC1Opts->ParseArgs(argv.begin()+1, argv.end(),
+ MissingArgIndex, MissingArgCount));
+ // We ignore MissingArgCount and the return value of ParseDiagnosticArgs.
+ // Any errors that would be diagnosed here will also be diagnosed later,
+ // when the DiagnosticsEngine actually exists.
+ (void) ParseDiagnosticArgs(DiagOpts, *Args);
+ }
+ // Now we can create the DiagnosticsEngine with a properly-filled-out
+ // DiagnosticOptions instance.
+ TextDiagnosticPrinter *DiagClient
+ = new TextDiagnosticPrinter(llvm::errs(), DiagOpts);
+ DiagClient->setPrefix(llvm::sys::path::stem(Path.str()));
+ IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+
+ DiagnosticsEngine Diags(DiagID, DiagClient);
+ ProcessWarningOptions(Diags, DiagOpts);
+
+#ifdef CLANG_IS_PRODUCTION
+ const bool IsProduction = true;
+#else
+ const bool IsProduction = false;
+#endif
+ Driver TheDriver(Path.str(), llvm::sys::getDefaultTargetTriple(),
+ "a.out", IsProduction, Diags);
+
+ // Attempt to find the original path used to invoke the driver, to determine
+ // the installed path. We do this manually, because we want to support that
+ // path being a symlink.
+ {
+ SmallString<128> InstalledPath(argv[0]);
+
+ // Do a PATH lookup, if there are no directory components.
+ if (llvm::sys::path::filename(InstalledPath) == InstalledPath) {
+ llvm::sys::Path Tmp = llvm::sys::Program::FindProgramByName(
+ llvm::sys::path::filename(InstalledPath.str()));
+ if (!Tmp.empty())
+ InstalledPath = Tmp.str();
+ }
+ llvm::sys::fs::make_absolute(InstalledPath);
+ InstalledPath = llvm::sys::path::parent_path(InstalledPath);
+ bool exists;
+ if (!llvm::sys::fs::exists(InstalledPath.str(), exists) && exists)
+ TheDriver.setInstalledDir(InstalledPath);
+ }
+
+ llvm::InitializeAllTargets();
+ ParseProgName(argv, SavedStrings, TheDriver);
+
+ // Handle CC_PRINT_OPTIONS and CC_PRINT_OPTIONS_FILE.
+ TheDriver.CCPrintOptions = !!::getenv("CC_PRINT_OPTIONS");
+ if (TheDriver.CCPrintOptions)
+ TheDriver.CCPrintOptionsFilename = ::getenv("CC_PRINT_OPTIONS_FILE");
+
+ // Handle CC_PRINT_HEADERS and CC_PRINT_HEADERS_FILE.
+ TheDriver.CCPrintHeaders = !!::getenv("CC_PRINT_HEADERS");
+ if (TheDriver.CCPrintHeaders)
+ TheDriver.CCPrintHeadersFilename = ::getenv("CC_PRINT_HEADERS_FILE");
+
+ // Handle CC_LOG_DIAGNOSTICS and CC_LOG_DIAGNOSTICS_FILE.
+ TheDriver.CCLogDiagnostics = !!::getenv("CC_LOG_DIAGNOSTICS");
+ if (TheDriver.CCLogDiagnostics)
+ TheDriver.CCLogDiagnosticsFilename = ::getenv("CC_LOG_DIAGNOSTICS_FILE");
+
+ // Handle QA_OVERRIDE_GCC3_OPTIONS and CCC_ADD_ARGS, used for editing a
+ // command line behind the scenes.
+ if (const char *OverrideStr = ::getenv("QA_OVERRIDE_GCC3_OPTIONS")) {
+ // FIXME: Driver shouldn't take extra initial argument.
+ ApplyQAOverride(argv, OverrideStr, SavedStrings);
+ } else if (const char *Cur = ::getenv("CCC_ADD_ARGS")) {
+ // FIXME: Driver shouldn't take extra initial argument.
+ std::vector<const char*> ExtraArgs;
+
+ for (;;) {
+ const char *Next = strchr(Cur, ',');
+
+ if (Next) {
+ ExtraArgs.push_back(SaveStringInSet(SavedStrings,
+ std::string(Cur, Next)));
+ Cur = Next + 1;
+ } else {
+ if (*Cur != '\0')
+ ExtraArgs.push_back(SaveStringInSet(SavedStrings, Cur));
+ break;
+ }
+ }
+
+ argv.insert(&argv[1], ExtraArgs.begin(), ExtraArgs.end());
+ }
+
+ OwningPtr<Compilation> C(TheDriver.BuildCompilation(argv));
+ int Res = 0;
+ const Command *FailingCommand = 0;
+ if (C.get())
+ Res = TheDriver.ExecuteCompilation(*C, FailingCommand);
+
+ // If result status is < 0, then the driver command signalled an error.
+ // In this case, generate additional diagnostic information if possible.
+ if (Res < 0)
+ TheDriver.generateCompilationDiagnostics(*C, FailingCommand);
+
+ // If any timers were active but haven't been destroyed yet, print their
+ // results now. This happens in -disable-free mode.
+ llvm::TimerGroup::printAll(llvm::errs());
+
+ llvm::llvm_shutdown();
+
+ return Res;
+}
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