xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/RISCVToolchain.cpp (revision 32100375a661c1e16588ddfa7b90ca8d26cb9786)
1 //===--- RISCVToolchain.cpp - RISCV 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 "RISCVToolchain.h"
10 #include "CommonArgs.h"
11 #include "InputInfo.h"
12 #include "clang/Driver/Compilation.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 /// RISCV Toolchain
35 RISCVToolChain::RISCVToolChain(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     ToolChain::path_list &PPaths = getProgramPaths();
48     // Multilib cross-compiler GCC installations put ld in a triple-prefixed
49     // directory off of the parent of the GCC installation.
50     PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
51                            GCCInstallation.getTriple().str() + "/bin")
52                          .str());
53     PPaths.push_back((GCCInstallation.getParentLibPath() + "/../bin").str());
54   } else {
55     getProgramPaths().push_back(D.Dir);
56   }
57   getFilePaths().push_back(computeSysRoot() + "/lib");
58 }
59 
60 Tool *RISCVToolChain::buildLinker() const {
61   return new tools::RISCV::Linker(*this);
62 }
63 
64 ToolChain::RuntimeLibType RISCVToolChain::GetDefaultRuntimeLibType() const {
65   return GCCInstallation.isValid() ?
66     ToolChain::RLT_Libgcc : ToolChain::RLT_CompilerRT;
67 }
68 
69 ToolChain::UnwindLibType
70 RISCVToolChain::GetUnwindLibType(const llvm::opt::ArgList &Args) const {
71   return ToolChain::UNW_None;
72 }
73 
74 void RISCVToolChain::addClangTargetOptions(
75     const llvm::opt::ArgList &DriverArgs,
76     llvm::opt::ArgStringList &CC1Args,
77     Action::OffloadKind) const {
78   CC1Args.push_back("-nostdsysteminc");
79 }
80 
81 void RISCVToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
82                                                ArgStringList &CC1Args) const {
83   if (DriverArgs.hasArg(options::OPT_nostdinc))
84     return;
85 
86   if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
87     SmallString<128> Dir(computeSysRoot());
88     llvm::sys::path::append(Dir, "include");
89     addSystemInclude(DriverArgs, CC1Args, Dir.str());
90   }
91 }
92 
93 void RISCVToolChain::addLibStdCxxIncludePaths(
94     const llvm::opt::ArgList &DriverArgs,
95     llvm::opt::ArgStringList &CC1Args) const {
96   const GCCVersion &Version = GCCInstallation.getVersion();
97   StringRef TripleStr = GCCInstallation.getTriple().str();
98   const Multilib &Multilib = GCCInstallation.getMultilib();
99   addLibStdCXXIncludePaths(computeSysRoot() + "/include/c++/" + Version.Text,
100       "", TripleStr, "", "", Multilib.includeSuffix(), DriverArgs, CC1Args);
101 }
102 
103 std::string RISCVToolChain::computeSysRoot() const {
104   if (!getDriver().SysRoot.empty())
105     return getDriver().SysRoot;
106 
107   SmallString<128> SysRootDir;
108   if (GCCInstallation.isValid()) {
109     StringRef LibDir = GCCInstallation.getParentLibPath();
110     StringRef TripleStr = GCCInstallation.getTriple().str();
111     llvm::sys::path::append(SysRootDir, LibDir, "..", TripleStr);
112   } else {
113     // Use the triple as provided to the driver. Unlike the parsed triple
114     // this has not been normalized to always contain every field.
115     llvm::sys::path::append(SysRootDir, getDriver().Dir, "..",
116                             getDriver().getTargetTriple());
117   }
118 
119   if (!llvm::sys::fs::exists(SysRootDir))
120     return std::string();
121 
122   return SysRootDir.str();
123 }
124 
125 void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
126                                  const InputInfo &Output,
127                                  const InputInfoList &Inputs,
128                                  const ArgList &Args,
129                                  const char *LinkingOutput) const {
130   const ToolChain &ToolChain = getToolChain();
131   const Driver &D = ToolChain.getDriver();
132   ArgStringList CmdArgs;
133 
134   if (!D.SysRoot.empty())
135     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
136 
137   bool IsRV64 = ToolChain.getArch() == llvm::Triple::riscv64;
138   CmdArgs.push_back("-m");
139   if (IsRV64) {
140     CmdArgs.push_back("elf64lriscv");
141   } else {
142     CmdArgs.push_back("elf32lriscv");
143   }
144 
145   std::string Linker = getToolChain().GetProgramPath(getShortName());
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 = ToolChain.getCompilerRTArgString(Args, "crtend",
160                                               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(crtbegin)));
166   }
167 
168   Args.AddAllArgs(CmdArgs, options::OPT_L);
169   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
170   Args.AddAllArgs(CmdArgs,
171                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,
172                    options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
173 
174   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
175 
176   // TODO: add C++ includes and libs if compiling C++.
177 
178   if (!Args.hasArg(options::OPT_nostdlib) &&
179       !Args.hasArg(options::OPT_nodefaultlibs)) {
180     if (ToolChain.ShouldLinkCXXStdlib(Args))
181       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
182     CmdArgs.push_back("--start-group");
183     CmdArgs.push_back("-lc");
184     CmdArgs.push_back("-lgloss");
185     CmdArgs.push_back("--end-group");
186     AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
187   }
188 
189   if (WantCRTs)
190     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
191 
192   CmdArgs.push_back("-o");
193   CmdArgs.push_back(Output.getFilename());
194   C.addCommand(std::make_unique<Command>(JA, *this, Args.MakeArgString(Linker),
195                                           CmdArgs, Inputs));
196 }
197 // RISCV tools end.
198