1 //===--- CSKYToolchain.cpp - CSKY ToolChain Implementations ---*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "CSKYToolChain.h"
10 #include "CommonArgs.h"
11 #include "clang/Driver/Compilation.h"
12 #include "clang/Driver/InputInfo.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/Option/ArgList.h"
15 #include "llvm/Support/FileSystem.h"
16 #include "llvm/Support/Path.h"
17 #include "llvm/Support/raw_ostream.h"
18 
19 using namespace clang::driver;
20 using namespace clang::driver::toolchains;
21 using namespace clang::driver::tools;
22 using namespace clang;
23 using namespace llvm::opt;
24 
25 static void addMultilibsFilePaths(const Driver &D, const MultilibSet &Multilibs,
26                                   const Multilib &Multilib,
27                                   StringRef InstallPath,
28                                   ToolChain::path_list &Paths) {
29   if (const auto &PathsCallback = Multilibs.filePathsCallback())
30     for (const auto &Path : PathsCallback(Multilib))
31       addPathIfExists(D, InstallPath + Path, Paths);
32 }
33 
34 /// CSKY Toolchain
35 CSKYToolChain::CSKYToolChain(const Driver &D, const llvm::Triple &Triple,
36                              const ArgList &Args)
37     : Generic_ELF(D, Triple, Args) {
38   GCCInstallation.init(Triple, Args);
39   if (GCCInstallation.isValid()) {
40     Multilibs = GCCInstallation.getMultilibs();
41     SelectedMultilib = GCCInstallation.getMultilib();
42     path_list &Paths = getFilePaths();
43     // Add toolchain/multilib specific file paths.
44     addMultilibsFilePaths(D, Multilibs, SelectedMultilib,
45                           GCCInstallation.getInstallPath(), Paths);
46     getFilePaths().push_back(GCCInstallation.getInstallPath().str() +
47                              SelectedMultilib.osSuffix());
48     ToolChain::path_list &PPaths = getProgramPaths();
49     // Multilib cross-compiler GCC installations put ld in a triple-prefixed
50     // directory off of the parent of the GCC installation.
51     PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
52                            GCCInstallation.getTriple().str() + "/bin")
53                          .str());
54     PPaths.push_back((GCCInstallation.getParentLibPath() + "/../bin").str());
55   } else {
56     getProgramPaths().push_back(D.Dir);
57   }
58   getFilePaths().push_back(computeSysRoot() + "/lib" +
59                            SelectedMultilib.osSuffix());
60 }
61 
62 Tool *CSKYToolChain::buildLinker() const {
63   return new tools::CSKY::Linker(*this);
64 }
65 
66 ToolChain::RuntimeLibType CSKYToolChain::GetDefaultRuntimeLibType() const {
67   return GCCInstallation.isValid() ? ToolChain::RLT_Libgcc
68                                    : ToolChain::RLT_CompilerRT;
69 }
70 
71 ToolChain::UnwindLibType
72 CSKYToolChain::GetUnwindLibType(const llvm::opt::ArgList &Args) const {
73   return ToolChain::UNW_None;
74 }
75 
76 void CSKYToolChain::addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
77                                           llvm::opt::ArgStringList &CC1Args,
78                                           Action::OffloadKind) const {
79   CC1Args.push_back("-nostdsysteminc");
80 }
81 
82 void CSKYToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
83                                               ArgStringList &CC1Args) const {
84   if (DriverArgs.hasArg(options::OPT_nostdinc))
85     return;
86 
87   if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
88     SmallString<128> Dir(computeSysRoot());
89     llvm::sys::path::append(Dir, "include");
90     addSystemInclude(DriverArgs, CC1Args, Dir.str());
91     SmallString<128> Dir2(computeSysRoot());
92     llvm::sys::path::append(Dir2, "sys-include");
93     addSystemInclude(DriverArgs, CC1Args, Dir2.str());
94   }
95 }
96 
97 void CSKYToolChain::addLibStdCxxIncludePaths(
98     const llvm::opt::ArgList &DriverArgs,
99     llvm::opt::ArgStringList &CC1Args) const {
100   const GCCVersion &Version = GCCInstallation.getVersion();
101   StringRef TripleStr = GCCInstallation.getTriple().str();
102   const Multilib &Multilib = GCCInstallation.getMultilib();
103   addLibStdCXXIncludePaths(computeSysRoot() + "/include/c++/" + Version.Text,
104                            TripleStr, Multilib.includeSuffix(), DriverArgs,
105                            CC1Args);
106 }
107 
108 std::string CSKYToolChain::computeSysRoot() const {
109   if (!getDriver().SysRoot.empty())
110     return getDriver().SysRoot;
111 
112   SmallString<128> SysRootDir;
113   if (GCCInstallation.isValid()) {
114     StringRef LibDir = GCCInstallation.getParentLibPath();
115     StringRef TripleStr = GCCInstallation.getTriple().str();
116     llvm::sys::path::append(SysRootDir, LibDir, "..", TripleStr);
117   } else {
118     // Use the triple as provided to the driver. Unlike the parsed triple
119     // this has not been normalized to always contain every field.
120     llvm::sys::path::append(SysRootDir, getDriver().Dir, "..",
121                             getDriver().getTargetTriple());
122   }
123 
124   if (!llvm::sys::fs::exists(SysRootDir))
125     return std::string();
126 
127   return std::string(SysRootDir.str());
128 }
129 
130 void CSKY::Linker::ConstructJob(Compilation &C, const JobAction &JA,
131                                 const InputInfo &Output,
132                                 const InputInfoList &Inputs,
133                                 const ArgList &Args,
134                                 const char *LinkingOutput) const {
135   const ToolChain &ToolChain = getToolChain();
136   const Driver &D = ToolChain.getDriver();
137   ArgStringList CmdArgs;
138 
139   if (!D.SysRoot.empty())
140     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
141 
142   CmdArgs.push_back("-m");
143   CmdArgs.push_back("cskyelf");
144 
145   std::string Linker = getToolChain().GetLinkerPath();
146 
147   bool WantCRTs =
148       !Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles);
149 
150   const char *crtbegin, *crtend;
151   auto RuntimeLib = ToolChain.GetRuntimeLibType(Args);
152   if (RuntimeLib == ToolChain::RLT_Libgcc) {
153     crtbegin = "crtbegin.o";
154     crtend = "crtend.o";
155   } else {
156     assert(RuntimeLib == ToolChain::RLT_CompilerRT);
157     crtbegin = ToolChain.getCompilerRTArgString(Args, "crtbegin",
158                                                 ToolChain::FT_Object);
159     crtend =
160         ToolChain.getCompilerRTArgString(Args, "crtend", ToolChain::FT_Object);
161   }
162 
163   if (WantCRTs) {
164     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
165     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
166     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
167   }
168 
169   Args.AddAllArgs(CmdArgs, options::OPT_L);
170   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
171   Args.AddAllArgs(CmdArgs,
172                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,
173                    options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
174 
175   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
176 
177   // TODO: add C++ includes and libs if compiling C++.
178 
179   if (!Args.hasArg(options::OPT_nostdlib) &&
180       !Args.hasArg(options::OPT_nodefaultlibs)) {
181     if (ToolChain.ShouldLinkCXXStdlib(Args))
182       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
183     CmdArgs.push_back("--start-group");
184     CmdArgs.push_back("-lc");
185     if (Args.hasArg(options::OPT_msim))
186       CmdArgs.push_back("-lsemi");
187     else
188       CmdArgs.push_back("-lnosys");
189     CmdArgs.push_back("--end-group");
190     AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
191   }
192 
193   if (WantCRTs) {
194     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
195     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
196   }
197 
198   CmdArgs.push_back("-o");
199   CmdArgs.push_back(Output.getFilename());
200   C.addCommand(std::make_unique<Command>(
201       JA, *this, ResponseFileSupport::AtFileCurCP(), Args.MakeArgString(Linker),
202       CmdArgs, Inputs, Output));
203 }
204 // CSKY tools end.
205