ToolChain.cpp revision 5b222059399ec9cccba7a393dc470adfb8a3db0f 
1//===--- ToolChain.cpp - Collections of tools for one platform ------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "Tools.h"
11#include "clang/Driver/ToolChain.h"
12#include "clang/Basic/ObjCRuntime.h"
13#include "clang/Driver/Action.h"
14#include "clang/Driver/Arg.h"
15#include "clang/Driver/ArgList.h"
16#include "clang/Driver/Driver.h"
17#include "clang/Driver/DriverDiagnostic.h"
18#include "clang/Driver/Option.h"
19#include "clang/Driver/Options.h"
20#include "llvm/ADT/StringSwitch.h"
21#include "llvm/Support/ErrorHandling.h"
22using namespace clang::driver;
23using namespace clang;
24
25ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
26                     const ArgList &A)
27  : D(D), Triple(T), Args(A) {
28}
29
30ToolChain::~ToolChain() {
31  // Free tool implementations.
32  for (llvm::DenseMap<unsigned, Tool*>::iterator
33       it = Tools.begin(), ie = Tools.end(); it != ie; ++it)
34    delete it->second;
35}
36
37const Driver &ToolChain::getDriver() const {
38 return D;
39}
40
41bool ToolChain::useIntegratedAs() const {
42  return Args.hasFlag(options::OPT_integrated_as,
43                      options::OPT_no_integrated_as,
44                      IsIntegratedAssemblerDefault());
45}
46
47std::string ToolChain::getDefaultUniversalArchName() const {
48  // In universal driver terms, the arch name accepted by -arch isn't exactly
49  // the same as the ones that appear in the triple. Roughly speaking, this is
50  // an inverse of the darwin::getArchTypeForDarwinArchName() function, but the
51  // only interesting special case is powerpc.
52  switch (Triple.getArch()) {
53  case llvm::Triple::ppc:
54    return "ppc";
55  case llvm::Triple::ppc64:
56    return "ppc64";
57  default:
58    return Triple.getArchName();
59  }
60}
61
62bool ToolChain::IsUnwindTablesDefault() const {
63  return false;
64}
65
66Tool &ToolChain::SelectTool(const JobAction &JA) const {
67  Action::ActionClass Key;
68  if (getDriver().ShouldUseClangCompiler(JA))
69    Key = Action::AnalyzeJobClass;
70  else
71    Key = JA.getKind();
72
73  Tool *&T = Tools[Key];
74  if (T)
75    return *T;
76
77  if (getDriver().ShouldUseClangCompiler(JA))
78    T = new tools::Clang(*this);
79  else
80    T = constructTool(Key);
81
82  return *T;
83}
84
85std::string ToolChain::GetFilePath(const char *Name) const {
86  return D.GetFilePath(Name, *this);
87
88}
89
90std::string ToolChain::GetProgramPath(const char *Name) const {
91  return D.GetProgramPath(Name, *this);
92}
93
94types::ID ToolChain::LookupTypeForExtension(const char *Ext) const {
95  return types::lookupTypeForExtension(Ext);
96}
97
98bool ToolChain::HasNativeLLVMSupport() const {
99  return false;
100}
101
102ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
103  return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
104                     VersionTuple());
105}
106
107/// getARMTargetCPU - Get the (LLVM) name of the ARM cpu we are targeting.
108//
109// FIXME: tblgen this.
110static const char *getARMTargetCPU(const ArgList &Args,
111                                   const llvm::Triple &Triple) {
112  // For Darwin targets, the -arch option (which is translated to a
113  // corresponding -march option) should determine the architecture
114  // (and the Mach-O slice) regardless of any -mcpu options.
115  if (!Triple.isOSDarwin()) {
116    // FIXME: Warn on inconsistent use of -mcpu and -march.
117    // If we have -mcpu=, use that.
118    if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
119      return A->getValue();
120  }
121
122  StringRef MArch;
123  if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
124    // Otherwise, if we have -march= choose the base CPU for that arch.
125    MArch = A->getValue();
126  } else {
127    // Otherwise, use the Arch from the triple.
128    MArch = Triple.getArchName();
129  }
130
131  return llvm::StringSwitch<const char *>(MArch)
132    .Cases("armv2", "armv2a","arm2")
133    .Case("armv3", "arm6")
134    .Case("armv3m", "arm7m")
135    .Cases("armv4", "armv4t", "arm7tdmi")
136    .Cases("armv5", "armv5t", "arm10tdmi")
137    .Cases("armv5e", "armv5te", "arm1026ejs")
138    .Case("armv5tej", "arm926ej-s")
139    .Cases("armv6", "armv6k", "arm1136jf-s")
140    .Case("armv6j", "arm1136j-s")
141    .Cases("armv6z", "armv6zk", "arm1176jzf-s")
142    .Case("armv6t2", "arm1156t2-s")
143    .Cases("armv6m", "armv6-m", "cortex-m0")
144    .Cases("armv7", "armv7a", "armv7-a", "cortex-a8")
145    .Cases("armv7l", "armv7-l", "cortex-a8")
146    .Cases("armv7f", "armv7-f", "cortex-a9-mp")
147    .Cases("armv7s", "armv7-s", "swift")
148    .Cases("armv7r", "armv7-r", "cortex-r4")
149    .Cases("armv7m", "armv7-m", "cortex-m3")
150    .Cases("armv7em", "armv7e-m", "cortex-m4")
151    .Case("ep9312", "ep9312")
152    .Case("iwmmxt", "iwmmxt")
153    .Case("xscale", "xscale")
154    // If all else failed, return the most base CPU LLVM supports.
155    .Default("arm7tdmi");
156}
157
158/// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
159/// CPU.
160//
161// FIXME: This is redundant with -mcpu, why does LLVM use this.
162// FIXME: tblgen this, or kill it!
163static const char *getLLVMArchSuffixForARM(StringRef CPU) {
164  return llvm::StringSwitch<const char *>(CPU)
165    .Cases("arm7tdmi", "arm7tdmi-s", "arm710t", "v4t")
166    .Cases("arm720t", "arm9", "arm9tdmi", "v4t")
167    .Cases("arm920", "arm920t", "arm922t", "v4t")
168    .Cases("arm940t", "ep9312","v4t")
169    .Cases("arm10tdmi",  "arm1020t", "v5")
170    .Cases("arm9e",  "arm926ej-s",  "arm946e-s", "v5e")
171    .Cases("arm966e-s",  "arm968e-s",  "arm10e", "v5e")
172    .Cases("arm1020e",  "arm1022e",  "xscale", "iwmmxt", "v5e")
173    .Cases("arm1136j-s",  "arm1136jf-s",  "arm1176jz-s", "v6")
174    .Cases("arm1176jzf-s",  "mpcorenovfp",  "mpcore", "v6")
175    .Cases("arm1156t2-s",  "arm1156t2f-s", "v6t2")
176    .Cases("cortex-a5", "cortex-a7", "cortex-a8", "v7")
177    .Cases("cortex-a9", "cortex-a15", "v7")
178    .Case("cortex-r5", "v7r")
179    .Case("cortex-m0", "v6m")
180    .Case("cortex-m3", "v7m")
181    .Case("cortex-m4", "v7em")
182    .Case("cortex-a9-mp", "v7f")
183    .Case("swift", "v7s")
184    .Default("");
185}
186
187std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
188                                         types::ID InputType) const {
189  switch (getTriple().getArch()) {
190  default:
191    return getTripleString();
192
193  case llvm::Triple::arm:
194  case llvm::Triple::thumb: {
195    // FIXME: Factor into subclasses.
196    llvm::Triple Triple = getTriple();
197
198    // Thumb2 is the default for V7 on Darwin.
199    //
200    // FIXME: Thumb should just be another -target-feaure, not in the triple.
201    StringRef Suffix =
202      getLLVMArchSuffixForARM(getARMTargetCPU(Args, Triple));
203    bool ThumbDefault = Suffix.startswith("v6m") ||
204      (Suffix.startswith("v7") && getTriple().isOSDarwin());
205    std::string ArchName = "arm";
206
207    // Assembly files should start in ARM mode.
208    if (InputType != types::TY_PP_Asm &&
209        Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, ThumbDefault))
210      ArchName = "thumb";
211    Triple.setArchName(ArchName + Suffix.str());
212
213    return Triple.getTriple();
214  }
215  }
216}
217
218std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
219                                                   types::ID InputType) const {
220  // Diagnose use of Darwin OS deployment target arguments on non-Darwin.
221  if (Arg *A = Args.getLastArg(options::OPT_mmacosx_version_min_EQ,
222                               options::OPT_miphoneos_version_min_EQ,
223                               options::OPT_mios_simulator_version_min_EQ))
224    getDriver().Diag(diag::err_drv_clang_unsupported)
225      << A->getAsString(Args);
226
227  return ComputeLLVMTriple(Args, InputType);
228}
229
230void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
231                                          ArgStringList &CC1Args) const {
232  // Each toolchain should provide the appropriate include flags.
233}
234
235void ToolChain::addClangTargetOptions(const ArgList &DriverArgs,
236                                      ArgStringList &CC1Args) const {
237}
238
239ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
240  const ArgList &Args) const
241{
242  if (Arg *A = Args.getLastArg(options::OPT_rtlib_EQ)) {
243    StringRef Value = A->getValue();
244    if (Value == "compiler-rt")
245      return ToolChain::RLT_CompilerRT;
246    if (Value == "libgcc")
247      return ToolChain::RLT_Libgcc;
248    getDriver().Diag(diag::err_drv_invalid_rtlib_name)
249      << A->getAsString(Args);
250  }
251
252  return GetDefaultRuntimeLibType();
253}
254
255ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
256  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
257    StringRef Value = A->getValue();
258    if (Value == "libc++")
259      return ToolChain::CST_Libcxx;
260    if (Value == "libstdc++")
261      return ToolChain::CST_Libstdcxx;
262    getDriver().Diag(diag::err_drv_invalid_stdlib_name)
263      << A->getAsString(Args);
264  }
265
266  return ToolChain::CST_Libstdcxx;
267}
268
269/// \brief Utility function to add a system include directory to CC1 arguments.
270/*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
271                                            ArgStringList &CC1Args,
272                                            const Twine &Path) {
273  CC1Args.push_back("-internal-isystem");
274  CC1Args.push_back(DriverArgs.MakeArgString(Path));
275}
276
277/// \brief Utility function to add a system include directory with extern "C"
278/// semantics to CC1 arguments.
279///
280/// Note that this should be used rarely, and only for directories that
281/// historically and for legacy reasons are treated as having implicit extern
282/// "C" semantics. These semantics are *ignored* by and large today, but its
283/// important to preserve the preprocessor changes resulting from the
284/// classification.
285/*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
286                                                   ArgStringList &CC1Args,
287                                                   const Twine &Path) {
288  CC1Args.push_back("-internal-externc-isystem");
289  CC1Args.push_back(DriverArgs.MakeArgString(Path));
290}
291
292/// \brief Utility function to add a list of system include directories to CC1.
293/*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
294                                             ArgStringList &CC1Args,
295                                             ArrayRef<StringRef> Paths) {
296  for (ArrayRef<StringRef>::iterator I = Paths.begin(), E = Paths.end();
297       I != E; ++I) {
298    CC1Args.push_back("-internal-isystem");
299    CC1Args.push_back(DriverArgs.MakeArgString(*I));
300  }
301}
302
303void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
304                                             ArgStringList &CC1Args) const {
305  // Header search paths should be handled by each of the subclasses.
306  // Historically, they have not been, and instead have been handled inside of
307  // the CC1-layer frontend. As the logic is hoisted out, this generic function
308  // will slowly stop being called.
309  //
310  // While it is being called, replicate a bit of a hack to propagate the
311  // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
312  // header search paths with it. Once all systems are overriding this
313  // function, the CC1 flag and this line can be removed.
314  DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
315}
316
317void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
318                                    ArgStringList &CmdArgs) const {
319  CXXStdlibType Type = GetCXXStdlibType(Args);
320
321  switch (Type) {
322  case ToolChain::CST_Libcxx:
323    CmdArgs.push_back("-lc++");
324    break;
325
326  case ToolChain::CST_Libstdcxx:
327    CmdArgs.push_back("-lstdc++");
328    break;
329  }
330}
331
332void ToolChain::AddCCKextLibArgs(const ArgList &Args,
333                                 ArgStringList &CmdArgs) const {
334  CmdArgs.push_back("-lcc_kext");
335}
336
337bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
338                                              ArgStringList &CmdArgs) const {
339  // Check if -ffast-math or -funsafe-math is enabled.
340  Arg *A = Args.getLastArg(options::OPT_ffast_math,
341                           options::OPT_fno_fast_math,
342                           options::OPT_funsafe_math_optimizations,
343                           options::OPT_fno_unsafe_math_optimizations);
344
345  if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
346      A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
347    return false;
348
349  // If crtfastmath.o exists add it to the arguments.
350  std::string Path = GetFilePath("crtfastmath.o");
351  if (Path == "crtfastmath.o") // Not found.
352    return false;
353
354  CmdArgs.push_back(Args.MakeArgString(Path));
355  return true;
356}
357