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llvm-project/clang/tools/driver/driver.cpp

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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/Options.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(createDriverOptTable());
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);
// Force a crash to test the diagnostics.
if(::getenv("FORCE_CLANG_DIAGNOSTICS_CRASH"))
Res = -1;
// 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();
#ifdef _WIN32
// Exit status should not be negative on Win32, unless abnormal termination.
// Once abnormal termiation was caught, negative status should not be
// propagated.
if (Res < 0)
Res = 1;
#endif
return Res;
}
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