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 "clang/Driver/ToolChain.h"
11 
12 #include "clang/Driver/Action.h"
13 #include "clang/Driver/Arg.h"
14 #include "clang/Driver/ArgList.h"
15 #include "clang/Driver/Driver.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/HostInfo.h"
18 #include "clang/Driver/ObjCRuntime.h"
19 #include "clang/Driver/Options.h"
20 #include "llvm/Support/ErrorHandling.h"
21 using namespace clang::driver;
22 using namespace clang;
23 
24 ToolChain::ToolChain(const HostInfo &H, const llvm::Triple &T)
25   : Host(H), Triple(T) {
26 }
27 
28 ToolChain::~ToolChain() {
29 }
30 
31 const Driver &ToolChain::getDriver() const {
32  return Host.getDriver();
33 }
34 
35 std::string ToolChain::GetFilePath(const char *Name) const {
36   return Host.getDriver().GetFilePath(Name, *this);
37 
38 }
39 
40 std::string ToolChain::GetProgramPath(const char *Name, bool WantFile) const {
41   return Host.getDriver().GetProgramPath(Name, *this, WantFile);
42 }
43 
44 types::ID ToolChain::LookupTypeForExtension(const char *Ext) const {
45   return types::lookupTypeForExtension(Ext);
46 }
47 
48 bool ToolChain::HasNativeLLVMSupport() const {
49   return false;
50 }
51 
52 void ToolChain::configureObjCRuntime(ObjCRuntime &runtime) const {
53   switch (runtime.getKind()) {
54   case ObjCRuntime::NeXT:
55     // Assume a minimal NeXT runtime.
56     runtime.HasARC = false;
57     runtime.HasWeak = false;
58     runtime.HasTerminate = false;
59     return;
60 
61   case ObjCRuntime::GNU:
62     // Assume a maximal GNU runtime.
63     runtime.HasARC = true;
64     runtime.HasWeak = true;
65     runtime.HasTerminate = false; // to be added
66     return;
67   }
68   llvm_unreachable("invalid runtime kind!");
69 }
70 
71 /// getARMTargetCPU - Get the (LLVM) name of the ARM cpu we are targeting.
72 //
73 // FIXME: tblgen this.
74 static const char *getARMTargetCPU(const ArgList &Args,
75                                    const llvm::Triple &Triple) {
76   // FIXME: Warn on inconsistent use of -mcpu and -march.
77 
78   // If we have -mcpu=, use that.
79   if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
80     return A->getValue(Args);
81 
82   StringRef MArch;
83   if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
84     // Otherwise, if we have -march= choose the base CPU for that arch.
85     MArch = A->getValue(Args);
86   } else {
87     // Otherwise, use the Arch from the triple.
88     MArch = Triple.getArchName();
89   }
90 
91   if (MArch == "armv2" || MArch == "armv2a")
92     return "arm2";
93   if (MArch == "armv3")
94     return "arm6";
95   if (MArch == "armv3m")
96     return "arm7m";
97   if (MArch == "armv4" || MArch == "armv4t")
98     return "arm7tdmi";
99   if (MArch == "armv5" || MArch == "armv5t")
100     return "arm10tdmi";
101   if (MArch == "armv5e" || MArch == "armv5te")
102     return "arm1026ejs";
103   if (MArch == "armv5tej")
104     return "arm926ej-s";
105   if (MArch == "armv6" || MArch == "armv6k")
106     return "arm1136jf-s";
107   if (MArch == "armv6j")
108     return "arm1136j-s";
109   if (MArch == "armv6z" || MArch == "armv6zk")
110     return "arm1176jzf-s";
111   if (MArch == "armv6t2")
112     return "arm1156t2-s";
113   if (MArch == "armv7" || MArch == "armv7a" || MArch == "armv7-a")
114     return "cortex-a8";
115   if (MArch == "armv7r" || MArch == "armv7-r")
116     return "cortex-r4";
117   if (MArch == "armv7m" || MArch == "armv7-m")
118     return "cortex-m3";
119   if (MArch == "ep9312")
120     return "ep9312";
121   if (MArch == "iwmmxt")
122     return "iwmmxt";
123   if (MArch == "xscale")
124     return "xscale";
125   if (MArch == "armv6m" || MArch == "armv6-m")
126     return "cortex-m0";
127 
128   // If all else failed, return the most base CPU LLVM supports.
129   return "arm7tdmi";
130 }
131 
132 /// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
133 /// CPU.
134 //
135 // FIXME: This is redundant with -mcpu, why does LLVM use this.
136 // FIXME: tblgen this, or kill it!
137 static const char *getLLVMArchSuffixForARM(StringRef CPU) {
138   if (CPU == "arm7tdmi" || CPU == "arm7tdmi-s" || CPU == "arm710t" ||
139       CPU == "arm720t" || CPU == "arm9" || CPU == "arm9tdmi" ||
140       CPU == "arm920" || CPU == "arm920t" || CPU == "arm922t" ||
141       CPU == "arm940t" || CPU == "ep9312")
142     return "v4t";
143 
144   if (CPU == "arm10tdmi" || CPU == "arm1020t")
145     return "v5";
146 
147   if (CPU == "arm9e" || CPU == "arm926ej-s" || CPU == "arm946e-s" ||
148       CPU == "arm966e-s" || CPU == "arm968e-s" || CPU == "arm10e" ||
149       CPU == "arm1020e" || CPU == "arm1022e" || CPU == "xscale" ||
150       CPU == "iwmmxt")
151     return "v5e";
152 
153   if (CPU == "arm1136j-s" || CPU == "arm1136jf-s" || CPU == "arm1176jz-s" ||
154       CPU == "arm1176jzf-s" || CPU == "mpcorenovfp" || CPU == "mpcore")
155     return "v6";
156 
157   if (CPU == "arm1156t2-s" || CPU == "arm1156t2f-s")
158     return "v6t2";
159 
160   if (CPU == "cortex-a8" || CPU == "cortex-a9")
161     return "v7";
162 
163   if (CPU == "cortex-m3")
164     return "v7m";
165 
166   if (CPU == "cortex-m0")
167     return "v6m";
168 
169   return "";
170 }
171 
172 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
173                                          types::ID InputType) const {
174   switch (getTriple().getArch()) {
175   default:
176     return getTripleString();
177 
178   case llvm::Triple::arm:
179   case llvm::Triple::thumb: {
180     // FIXME: Factor into subclasses.
181     llvm::Triple Triple = getTriple();
182 
183     // Thumb2 is the default for V7 on Darwin.
184     //
185     // FIXME: Thumb should just be another -target-feaure, not in the triple.
186     StringRef Suffix =
187       getLLVMArchSuffixForARM(getARMTargetCPU(Args, Triple));
188     bool ThumbDefault =
189       (Suffix == "v7" && getTriple().getOS() == llvm::Triple::Darwin);
190     std::string ArchName = "arm";
191 
192     // Assembly files should start in ARM mode.
193     if (InputType != types::TY_PP_Asm &&
194         Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, ThumbDefault))
195       ArchName = "thumb";
196     Triple.setArchName(ArchName + Suffix.str());
197 
198     return Triple.getTriple();
199   }
200   }
201 }
202 
203 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
204                                                    types::ID InputType) const {
205   // Diagnose use of Darwin OS deployment target arguments on non-Darwin.
206   if (Arg *A = Args.getLastArg(options::OPT_mmacosx_version_min_EQ,
207                                options::OPT_miphoneos_version_min_EQ,
208                                options::OPT_mios_simulator_version_min_EQ))
209     getDriver().Diag(diag::err_drv_clang_unsupported)
210       << A->getAsString(Args);
211 
212   return ComputeLLVMTriple(Args, InputType);
213 }
214 
215 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
216   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
217     StringRef Value = A->getValue(Args);
218     if (Value == "libc++")
219       return ToolChain::CST_Libcxx;
220     if (Value == "libstdc++")
221       return ToolChain::CST_Libstdcxx;
222     getDriver().Diag(diag::err_drv_invalid_stdlib_name)
223       << A->getAsString(Args);
224   }
225 
226   return ToolChain::CST_Libstdcxx;
227 }
228 
229 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &Args,
230                                              ArgStringList &CmdArgs,
231                                              bool ObjCXXAutoRefCount) const {
232   CXXStdlibType Type = GetCXXStdlibType(Args);
233 
234   // Header search paths are handled by the mass of goop in InitHeaderSearch.
235 
236   switch (Type) {
237   case ToolChain::CST_Libcxx:
238     if (ObjCXXAutoRefCount)
239       CmdArgs.push_back("-fobjc-arc-cxxlib=libc++");
240     break;
241 
242   case ToolChain::CST_Libstdcxx:
243     if (ObjCXXAutoRefCount)
244       CmdArgs.push_back("-fobjc-arc-cxxlib=libstdc++");
245     break;
246   }
247 }
248 
249 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
250                                     ArgStringList &CmdArgs) const {
251   CXXStdlibType Type = GetCXXStdlibType(Args);
252 
253   switch (Type) {
254   case ToolChain::CST_Libcxx:
255     CmdArgs.push_back("-lc++");
256     break;
257 
258   case ToolChain::CST_Libstdcxx:
259     CmdArgs.push_back("-lstdc++");
260     break;
261   }
262 }
263 
264 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
265                                  ArgStringList &CmdArgs) const {
266   CmdArgs.push_back("-lcc_kext");
267 }
268