clang-1/lib/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.
//
//===----------------------------------------------------------------------===//
#include "clang/Driver/Driver.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Arg.h"
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/HostInfo.h"
#include "clang/Driver/Option.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/Types.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include <map>
using namespace clang::driver;
Driver::Driver(const char *_Name, const char *_Dir,
const char *_DefaultHostTriple,
Diagnostic &_Diags)
: Opts(new OptTable()), Diags(_Diags),
Name(_Name), Dir(_Dir), DefaultHostTriple(_DefaultHostTriple),
Host(0),
CCCIsCXX(false), CCCEcho(false),
CCCNoClang(false), CCCNoClangCXX(false), CCCNoClangCPP(false),
SuppressMissingInputWarning(false)
{
}
Driver::~Driver() {
delete Opts;
}
ArgList *Driver::ParseArgStrings(const char **ArgBegin, const char **ArgEnd) {
ArgList *Args = new ArgList(ArgBegin, ArgEnd);
// FIXME: Handle '@' args (or at least error on them).
unsigned Index = 0, End = ArgEnd - ArgBegin;
while (Index < End) {
// gcc's handling of empty arguments doesn't make
// sense, but this is not a common use case. :)
//
// We just ignore them here (note that other things may
// still take them as arguments).
if (Args->getArgString(Index)[0] == '\0') {
++Index;
continue;
}
unsigned Prev = Index;
Arg *A = getOpts().ParseOneArg(*Args, Index, End);
if (A) {
if (A->getOption().isUnsupported()) {
Diag(clang::diag::err_drv_unsupported_opt) << A->getOption().getName();
continue;
}
Args->append(A);
}
assert(Index > Prev && "Parser failed to consume argument.");
}
return Args;
}
Compilation *Driver::BuildCompilation(int argc, const char **argv) {
// FIXME: Handle environment options which effect driver behavior,
// somewhere (client?). GCC_EXEC_PREFIX, COMPILER_PATH,
// LIBRARY_PATH, LPATH, CC_PRINT_OPTIONS, QA_OVERRIDE_GCC3_OPTIONS.
// FIXME: What are we going to do with -V and -b?
// FIXME: Handle CCC_ADD_ARGS.
// FIXME: This stuff needs to go into the Compilation, not the
// driver.
bool CCCPrintOptions = false, CCCPrintActions = false;
const char **Start = argv + 1, **End = argv + argc;
const char *HostTriple = DefaultHostTriple.c_str();
// Read -ccc args.
//
// FIXME: We need to figure out where this behavior should
// live. Most of it should be outside in the client; the parts that
// aren't should have proper options, either by introducing new ones
// or by overloading gcc ones like -V or -b.
for (; Start != End && memcmp(*Start, "-ccc-", 5) == 0; ++Start) {
const char *Opt = *Start + 5;
if (!strcmp(Opt, "print-options")) {
CCCPrintOptions = true;
} else if (!strcmp(Opt, "print-phases")) {
CCCPrintActions = true;
} else if (!strcmp(Opt, "cxx")) {
CCCIsCXX = true;
} else if (!strcmp(Opt, "echo")) {
CCCEcho = true;
} else if (!strcmp(Opt, "no-clang")) {
CCCNoClang = true;
} else if (!strcmp(Opt, "no-clang-cxx")) {
CCCNoClangCXX = true;
} else if (!strcmp(Opt, "no-clang-cpp")) {
CCCNoClangCPP = true;
} else if (!strcmp(Opt, "clang-archs")) {
assert(Start+1 < End && "FIXME: -ccc- argument handling.");
const char *Cur = *++Start;
for (;;) {
const char *Next = strchr(Cur, ',');
if (Next) {
CCCClangArchs.insert(std::string(Cur, Next));
Cur = Next + 1;
} else {
CCCClangArchs.insert(std::string(Cur));
break;
}
}
} else if (!strcmp(Opt, "host-triple")) {
assert(Start+1 < End && "FIXME: -ccc- argument handling.");
HostTriple = *++Start;
} else {
// FIXME: Error handling.
llvm::errs() << "invalid option: " << *Start << "\n";
exit(1);
}
}
ArgList *Args = ParseArgStrings(Start, End);
Host = Driver::GetHostInfo(HostTriple);
DefaultToolChain = Host->getToolChain(*Args);
// FIXME: This behavior shouldn't be here.
if (CCCPrintOptions) {
PrintOptions(*Args);
return 0;
}
if (!HandleImmediateArgs(*Args))
return 0;
// Construct the list of abstract actions to perform for this
// compilation.
ActionList Actions;
if (Host->useDriverDriver())
BuildUniversalActions(*Args, Actions);
else
BuildActions(*Args, Actions);
if (CCCPrintActions) {
PrintActions(*Args, Actions);
return 0;
}
return BuildJobs(*Args, Actions);
}
void Driver::PrintOptions(const ArgList &Args) const {
unsigned i = 0;
for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
it != ie; ++it, ++i) {
Arg *A = *it;
llvm::errs() << "Option " << i << " - "
<< "Name: \"" << A->getOption().getName() << "\", "
<< "Values: {";
for (unsigned j = 0; j < A->getNumValues(); ++j) {
if (j)
llvm::errs() << ", ";
llvm::errs() << '"' << A->getValue(Args, j) << '"';
}
llvm::errs() << "}\n";
}
}
void Driver::PrintVersion() const {
// FIXME: Get a reasonable version number.
// FIXME: The following handlers should use a callback mechanism, we
// don't know what the client would like to do.
llvm::outs() << "ccc version 1.0" << "\n";
}
bool Driver::HandleImmediateArgs(const ArgList &Args) {
// The order these options are handled in in gcc is all over the
// place, but we don't expect inconsistencies w.r.t. that to matter
// in practice.
if (Args.hasArg(options::OPT_v) ||
Args.hasArg(options::OPT__HASH_HASH_HASH)) {
PrintVersion();
SuppressMissingInputWarning = true;
}
// FIXME: The following handlers should use a callback mechanism, we
// don't know what the client would like to do.
if (Arg *A = Args.getLastArg(options::OPT_print_file_name_EQ)) {
llvm::outs() << GetFilePath(A->getValue(Args)).toString() << "\n";
return false;
}
if (Arg *A = Args.getLastArg(options::OPT_print_prog_name_EQ)) {
llvm::outs() << GetProgramPath(A->getValue(Args)).toString() << "\n";
return false;
}
if (Args.hasArg(options::OPT_print_libgcc_file_name)) {
llvm::outs() << GetProgramPath("libgcc.a").toString() << "\n";
return false;
}
return true;
}
static unsigned PrintActions1(const ArgList &Args,
Action *A,
std::map<Action*, unsigned> &Ids) {
if (Ids.count(A))
return Ids[A];
std::string str;
llvm::raw_string_ostream os(str);
os << Action::getClassName(A->getKind()) << ", ";
if (InputAction *IA = dyn_cast<InputAction>(A)) {
os << "\"" << IA->getInputArg().getValue(Args) << "\"";
} else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
os << "\"" << BIA->getArchName() << "\", "
<< "{" << PrintActions1(Args, *BIA->begin(), Ids) << "}";
} else {
os << "{";
for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
os << PrintActions1(Args, *it, Ids);
++it;
if (it != ie)
os << ", ";
}
os << "}";
}
unsigned Id = Ids.size();
Ids[A] = Id;
llvm::errs() << Id << ": " << os.str() << ", "
<< types::getTypeName(A->getType()) << "\n";
return Id;
}
void Driver::PrintActions(const ArgList &Args,
const ActionList &Actions) const {
std::map<Action*, unsigned> Ids;
for (ActionList::const_iterator it = Actions.begin(), ie = Actions.end();
it != ie; ++it)
PrintActions1(Args, *it, Ids);
}
void Driver::BuildUniversalActions(ArgList &Args, ActionList &Actions) const {
// Collect the list of architectures. Duplicates are allowed, but
// should only be handled once (in the order seen).
llvm::StringSet<> ArchNames;
llvm::SmallVector<const char *, 4> Archs;
for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
it != ie; ++it) {
Arg *A = *it;
if (A->getOption().getId() == options::OPT_arch) {
const char *Name = A->getValue(Args);
// FIXME: We need to handle canonicalization of the specified
// arch?
if (ArchNames.insert(Name))
Archs.push_back(Name);
}
}
// When there is no explicit arch for this platform, get one from
// the host so that -Xarch_ is handled correctly.
if (!Archs.size()) {
const char *Arch = Host->getArchName().c_str();
Archs.push_back(Arch);
}
// FIXME: We killed off some others but these aren't yet detected in
// a functional manner. If we added information to jobs about which
// "auxiliary" files they wrote then we could detect the conflict
// these cause downstream.
if (Archs.size() > 1) {
// No recovery needed, the point of this is just to prevent
// overwriting the same files.
if (const Arg *A = Args.getLastArg(options::OPT_M_Group))
Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
<< A->getOption().getName();
if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
<< A->getOption().getName();
}
ActionList SingleActions;
BuildActions(Args, SingleActions);
// Add in arch binding and lipo (if necessary) for every top level
// action.
for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
Action *Act = SingleActions[i];
// Make sure we can lipo this kind of output. If not (and it is an
// actual output) then we disallow, since we can't create an
// output file with the right name without overwriting it. We
// could remove this oddity by just changing the output names to
// include the arch, which would also fix
// -save-temps. Compatibility wins for now.
if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
<< types::getTypeName(Act->getType());
ActionList Inputs;
for (unsigned i = 0, e = Archs.size(); i != e; ++i )
Inputs.push_back(new BindArchAction(Act, Archs[i]));
// Lipo if necessary, We do it this way because we need to set the
// arch flag so that -Xarch_ gets overwritten.
if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
Actions.append(Inputs.begin(), Inputs.end());
else
Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
}
}
void Driver::BuildActions(ArgList &Args, ActionList &Actions) const {
// Start by constructing the list of inputs and their types.
// Track the current user specified (-x) input. We also explicitly
// track the argument used to set the type; we only want to claim
// the type when we actually use it, so we warn about unused -x
// arguments.
types::ID InputType = types::TY_Nothing;
Arg *InputTypeArg = 0;
llvm::SmallVector<std::pair<types::ID, const Arg*>, 16> Inputs;
for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
it != ie; ++it) {
Arg *A = *it;
if (isa<InputOption>(A->getOption())) {
const char *Value = A->getValue(Args);
types::ID Ty = types::TY_INVALID;
// Infer the input type if necessary.
if (InputType == types::TY_Nothing) {
// If there was an explicit arg for this, claim it.
if (InputTypeArg)
InputTypeArg->claim();
// stdin must be handled specially.
if (memcmp(Value, "-", 2) == 0) {
// If running with -E, treat as a C input (this changes the
// builtin macros, for example). This may be overridden by
// -ObjC below.
//
// Otherwise emit an error but still use a valid type to
// avoid spurious errors (e.g., no inputs).
if (!Args.hasArg(options::OPT_E, false))
Diag(clang::diag::err_drv_unknown_stdin_type);
Ty = types::TY_C;
} else {
// Otherwise lookup by extension, and fallback to ObjectType
// if not found.
if (const char *Ext = strrchr(Value, '.'))
Ty = types::lookupTypeForExtension(Ext + 1);
if (Ty == types::TY_INVALID)
Ty = types::TY_Object;
}
// -ObjC and -ObjC++ override the default language, but only
// -for "source files". We just treat everything that isn't a
// -linker input as a source file.
//
// FIXME: Clean this up if we move the phase sequence into the
// type.
if (Ty != types::TY_Object) {
if (Args.hasArg(options::OPT_ObjC))
Ty = types::TY_ObjC;
else if (Args.hasArg(options::OPT_ObjCXX))
Ty = types::TY_ObjCXX;
}
} else {
assert(InputTypeArg && "InputType set w/o InputTypeArg");
InputTypeArg->claim();
Ty = InputType;
}
// Check that the file exists. It isn't clear this is worth
// doing, since the tool presumably does this anyway, and this
// just adds an extra stat to the equation, but this is gcc
// compatible.
if (memcmp(Value, "-", 2) != 0 && !llvm::sys::Path(Value).exists())
Diag(clang::diag::err_drv_no_such_file) << A->getValue(Args);
else
Inputs.push_back(std::make_pair(Ty, A));
} else if (A->getOption().isLinkerInput()) {
// Just treat as object type, we could make a special type for
// this if necessary.
Inputs.push_back(std::make_pair(types::TY_Object, A));
} else if (A->getOption().getId() == options::OPT_x) {
InputTypeArg = A;
InputType = types::lookupTypeForTypeSpecifier(A->getValue(Args));
// Follow gcc behavior and treat as linker input for invalid -x
// options. Its not clear why we shouldn't just revert to
// unknown; but this isn't very important, we might as well be
// bug comatible.
if (!InputType) {
Diag(clang::diag::err_drv_unknown_language) << A->getValue(Args);
InputType = types::TY_Object;
}
}
}
if (!SuppressMissingInputWarning && Inputs.empty()) {
Diag(clang::diag::err_drv_no_input_files);
return;
}
// Determine which compilation mode we are in. We look for options
// which affect the phase, starting with the earliest phases, and
// record which option we used to determine the final phase.
Arg *FinalPhaseArg = 0;
phases::ID FinalPhase;
// -{E,M,MM} only run the preprocessor.
if ((FinalPhaseArg = Args.getLastArg(options::OPT_E)) ||
(FinalPhaseArg = Args.getLastArg(options::OPT_M)) ||
(FinalPhaseArg = Args.getLastArg(options::OPT_MM))) {
FinalPhase = phases::Preprocess;
// -{fsyntax-only,-analyze,emit-llvm,S} only run up to the compiler.
} else if ((FinalPhaseArg = Args.getLastArg(options::OPT_fsyntax_only)) ||
(FinalPhaseArg = Args.getLastArg(options::OPT__analyze)) ||
(FinalPhaseArg = Args.getLastArg(options::OPT_emit_llvm)) ||
(FinalPhaseArg = Args.getLastArg(options::OPT_S))) {
FinalPhase = phases::Compile;
// -c only runs up to the assembler.
} else if ((FinalPhaseArg = Args.getLastArg(options::OPT_c))) {
FinalPhase = phases::Assemble;
// Otherwise do everything.
} else
FinalPhase = phases::Link;
// Reject -Z* at the top level, these options should never have been
// exposed by gcc.
if (Arg *A = Args.getLastArg(options::OPT_Z))
Diag(clang::diag::err_drv_use_of_Z_option) << A->getValue(Args);
// Construct the actions to perform.
ActionList LinkerInputs;
for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
types::ID InputType = Inputs[i].first;
const Arg *InputArg = Inputs[i].second;
unsigned NumSteps = types::getNumCompilationPhases(InputType);
assert(NumSteps && "Invalid number of steps!");
// If the first step comes after the final phase we are doing as
// part of this compilation, warn the user about it.
phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
if (InitialPhase > FinalPhase) {
Diag(clang::diag::warn_drv_input_file_unused)
<< InputArg->getValue(Args)
<< getPhaseName(InitialPhase)
<< FinalPhaseArg->getOption().getName();
continue;
}
// Build the pipeline for this file.
Action *Current = new InputAction(*InputArg, InputType);
for (unsigned i = 0; i != NumSteps; ++i) {
phases::ID Phase = types::getCompilationPhase(InputType, i);
// We are done if this step is past what the user requested.
if (Phase > FinalPhase)
break;
// Queue linker inputs.
if (Phase == phases::Link) {
assert(i + 1 == NumSteps && "linking must be final compilation step.");
LinkerInputs.push_back(Current);
Current = 0;
break;
}
// Otherwise construct the appropriate action.
Current = ConstructPhaseAction(Args, Phase, Current);
if (Current->getType() == types::TY_Nothing)
break;
}
// If we ended with something, add to the output list.
if (Current)
Actions.push_back(Current);
}
// Add a link action if necessary.
if (!LinkerInputs.empty())
Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
}
Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
Action *Input) const {
// Build the appropriate action.
switch (Phase) {
case phases::Link: assert(0 && "link action invalid here.");
case phases::Preprocess: {
types::ID OutputTy = types::getPreprocessedType(Input->getType());
assert(OutputTy != types::TY_INVALID &&
"Cannot preprocess this input type!");
return new PreprocessJobAction(Input, OutputTy);
}
case phases::Precompile:
return new PrecompileJobAction(Input, types::TY_PCH);
case phases::Compile: {
if (Args.hasArg(options::OPT_fsyntax_only)) {
return new CompileJobAction(Input, types::TY_Nothing);
} else if (Args.hasArg(options::OPT__analyze)) {
return new AnalyzeJobAction(Input, types::TY_Plist);
} else if (Args.hasArg(options::OPT_emit_llvm)) {
types::ID Output =
Args.hasArg(options::OPT_S) ? types::TY_LLVMAsm : types::TY_LLVMBC;
return new CompileJobAction(Input, Output);
} else {
return new CompileJobAction(Input, types::TY_PP_Asm);
}
}
case phases::Assemble:
return new AssembleJobAction(Input, types::TY_Object);
}
assert(0 && "invalid phase in ConstructPhaseAction");
return 0;
}
Compilation *Driver::BuildJobs(const ArgList &Args,
const ActionList &Actions) const {
assert(0 && "FIXME: Implement");
return 0;
}
llvm::sys::Path Driver::GetFilePath(const char *Name) const {
// FIXME: Implement.
return llvm::sys::Path(Name);
}
llvm::sys::Path Driver::GetProgramPath(const char *Name) const {
// FIXME: Implement.
return llvm::sys::Path(Name);
}
HostInfo *Driver::GetHostInfo(const char *Triple) {
// Dice into arch, platform, and OS. This matches
// arch,platform,os = '(.*?)-(.*?)-(.*?)'
// and missing fields are left empty.
std::string Arch, Platform, OS;
if (const char *ArchEnd = strchr(Triple, '-')) {
Arch = std::string(Triple, ArchEnd);
if (const char *PlatformEnd = strchr(ArchEnd+1, '-')) {
Platform = std::string(ArchEnd+1, PlatformEnd);
OS = PlatformEnd+1;
} else
Platform = ArchEnd+1;
} else
Arch = Triple;
if (memcmp(&OS[0], "darwin", 6) == 0)
return new DarwinHostInfo(Arch.c_str(), Platform.c_str(), OS.c_str());
return new UnknownHostInfo(Arch.c_str(), Platform.c_str(), OS.c_str());
}