RISCVToolchain.cpp revision 360784 
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
19using namespace clang::driver;
20using namespace clang::driver::toolchains;
21using namespace clang::driver::tools;
22using namespace clang;
23using namespace llvm::opt;
24
25static 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
35RISCVToolChain::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
60Tool *RISCVToolChain::buildLinker() const {
61  return new tools::RISCV::Linker(*this);
62}
63
64ToolChain::RuntimeLibType RISCVToolChain::GetDefaultRuntimeLibType() const {
65  return GCCInstallation.isValid() ?
66    ToolChain::RLT_Libgcc : ToolChain::RLT_CompilerRT;
67}
68
69ToolChain::UnwindLibType
70RISCVToolChain::GetUnwindLibType(const llvm::opt::ArgList &Args) const {
71  return ToolChain::UNW_None;
72}
73
74void RISCVToolChain::addClangTargetOptions(
75    const llvm::opt::ArgList &DriverArgs,
76    llvm::opt::ArgStringList &CC1Args,
77    Action::OffloadKind) const {
78  CC1Args.push_back("-nostdsysteminc");
79}
80
81void 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
93void 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
103std::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
125void 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