1 //===--- Mips.cpp - Mips ToolChain Implementations --------------*- C++ -*-===//
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 "MipsLinux.h"
11 #include "Arch/Mips.h"
12 #include "CommonArgs.h"
13 #include "clang/Driver/Driver.h"
14 #include "clang/Driver/DriverDiagnostic.h"
15 #include "clang/Driver/Options.h"
16 #include "llvm/Option/ArgList.h"
17 #include "llvm/Support/FileSystem.h"
18 #include "llvm/Support/Path.h"
19 
20 using namespace clang::driver;
21 using namespace clang::driver::toolchains;
22 using namespace clang;
23 using namespace llvm::opt;
24 
25 /// Mips Toolchain
26 MipsLLVMToolChain::MipsLLVMToolChain(const Driver &D,
27                                      const llvm::Triple &Triple,
28                                      const ArgList &Args)
29     : Linux(D, Triple, Args) {
30   // Select the correct multilib according to the given arguments.
31   DetectedMultilibs Result;
32   findMIPSMultilibs(D, Triple, "", Args, Result);
33   Multilibs = Result.Multilibs;
34   SelectedMultilib = Result.SelectedMultilib;
35 
36   // Find out the library suffix based on the ABI.
37   LibSuffix = tools::mips::getMipsABILibSuffix(Args, Triple);
38   getFilePaths().clear();
39   getFilePaths().push_back(computeSysRoot() + "/usr/lib" + LibSuffix);
40 }
41 
42 void MipsLLVMToolChain::AddClangSystemIncludeArgs(
43     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
44   if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
45     return;
46 
47   const Driver &D = getDriver();
48 
49   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
50     SmallString<128> P(D.ResourceDir);
51     llvm::sys::path::append(P, "include");
52     addSystemInclude(DriverArgs, CC1Args, P);
53   }
54 
55   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
56     return;
57 
58   const auto &Callback = Multilibs.includeDirsCallback();
59   if (Callback) {
60     for (const auto &Path : Callback(SelectedMultilib))
61       addExternCSystemIncludeIfExists(DriverArgs, CC1Args,
62                                       D.getInstalledDir() + Path);
63   }
64 }
65 
66 Tool *MipsLLVMToolChain::buildLinker() const {
67   return new tools::gnutools::Linker(*this);
68 }
69 
70 std::string MipsLLVMToolChain::computeSysRoot() const {
71   if (!getDriver().SysRoot.empty())
72     return getDriver().SysRoot + SelectedMultilib.osSuffix();
73 
74   const std::string InstalledDir(getDriver().getInstalledDir());
75   std::string SysRootPath =
76       InstalledDir + "/../sysroot" + SelectedMultilib.osSuffix();
77   if (llvm::sys::fs::exists(SysRootPath))
78     return SysRootPath;
79 
80   return std::string();
81 }
82 
83 ToolChain::CXXStdlibType
84 MipsLLVMToolChain::GetCXXStdlibType(const ArgList &Args) const {
85   Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
86   if (A) {
87     StringRef Value = A->getValue();
88     if (Value != "libc++")
89       getDriver().Diag(clang::diag::err_drv_invalid_stdlib_name)
90           << A->getAsString(Args);
91   }
92 
93   return ToolChain::CST_Libcxx;
94 }
95 
96 void MipsLLVMToolChain::addLibCxxIncludePaths(
97     const llvm::opt::ArgList &DriverArgs,
98     llvm::opt::ArgStringList &CC1Args) const {
99   if (const auto &Callback = Multilibs.includeDirsCallback()) {
100     for (std::string Path : Callback(SelectedMultilib)) {
101       Path = getDriver().getInstalledDir() + Path + "/c++/v1";
102       if (llvm::sys::fs::exists(Path)) {
103         addSystemInclude(DriverArgs, CC1Args, Path);
104         return;
105       }
106     }
107   }
108 }
109 
110 void MipsLLVMToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
111                                             ArgStringList &CmdArgs) const {
112   assert((GetCXXStdlibType(Args) == ToolChain::CST_Libcxx) &&
113          "Only -lc++ (aka libxx) is supported in this toolchain.");
114 
115   CmdArgs.push_back("-lc++");
116   CmdArgs.push_back("-lc++abi");
117   CmdArgs.push_back("-lunwind");
118 }
119 
120 std::string MipsLLVMToolChain::getCompilerRT(const ArgList &Args,
121                                              StringRef Component,
122                                              bool Shared) const {
123   SmallString<128> Path(getDriver().ResourceDir);
124   llvm::sys::path::append(Path, SelectedMultilib.osSuffix(), "lib" + LibSuffix,
125                           getOS());
126   llvm::sys::path::append(Path, Twine("libclang_rt." + Component + "-" +
127                                       "mips" + (Shared ? ".so" : ".a")));
128   return Path.str();
129 }
130