1 //===--- CloudABI.cpp - CloudABI 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 "CloudABI.h" 10 #include "InputInfo.h" 11 #include "CommonArgs.h" 12 #include "clang/Driver/Compilation.h" 13 #include "clang/Driver/Driver.h" 14 #include "clang/Driver/Options.h" 15 #include "llvm/ADT/SmallString.h" 16 #include "llvm/Option/ArgList.h" 17 #include "llvm/Support/Path.h" 18 19 using namespace clang::driver; 20 using namespace clang::driver::tools; 21 using namespace clang::driver::toolchains; 22 using namespace clang; 23 using namespace llvm::opt; 24 25 void cloudabi::Linker::ConstructJob(Compilation &C, const JobAction &JA, 26 const InputInfo &Output, 27 const InputInfoList &Inputs, 28 const ArgList &Args, 29 const char *LinkingOutput) const { 30 const ToolChain &ToolChain = getToolChain(); 31 const Driver &D = ToolChain.getDriver(); 32 ArgStringList CmdArgs; 33 34 // Silence warning for "clang -g foo.o -o foo" 35 Args.ClaimAllArgs(options::OPT_g_Group); 36 // and "clang -emit-llvm foo.o -o foo" 37 Args.ClaimAllArgs(options::OPT_emit_llvm); 38 // and for "clang -w foo.o -o foo". Other warning options are already 39 // handled somewhere else. 40 Args.ClaimAllArgs(options::OPT_w); 41 42 if (!D.SysRoot.empty()) 43 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot)); 44 45 // CloudABI only supports static linkage. 46 CmdArgs.push_back("-Bstatic"); 47 CmdArgs.push_back("--no-dynamic-linker"); 48 49 // Provide PIE linker flags in case PIE is default for the architecture. 50 if (ToolChain.isPIEDefault()) { 51 CmdArgs.push_back("-pie"); 52 CmdArgs.push_back("-zrelro"); 53 } 54 55 CmdArgs.push_back("--eh-frame-hdr"); 56 CmdArgs.push_back("--gc-sections"); 57 58 if (Output.isFilename()) { 59 CmdArgs.push_back("-o"); 60 CmdArgs.push_back(Output.getFilename()); 61 } else { 62 assert(Output.isNothing() && "Invalid output."); 63 } 64 65 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) { 66 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o"))); 67 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o"))); 68 } 69 70 Args.AddAllArgs(CmdArgs, options::OPT_L); 71 ToolChain.AddFilePathLibArgs(Args, CmdArgs); 72 Args.AddAllArgs(CmdArgs, 73 {options::OPT_T_Group, options::OPT_e, options::OPT_s, 74 options::OPT_t, options::OPT_Z_Flag, options::OPT_r}); 75 76 if (D.isUsingLTO()) { 77 assert(!Inputs.empty() && "Must have at least one input."); 78 addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0], 79 D.getLTOMode() == LTOK_Thin); 80 } 81 82 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA); 83 84 if (ToolChain.ShouldLinkCXXStdlib(Args)) 85 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs); 86 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) { 87 CmdArgs.push_back("-lc"); 88 CmdArgs.push_back("-lcompiler_rt"); 89 } 90 91 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) 92 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o"))); 93 94 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath()); 95 C.addCommand(std::make_unique<Command>( 96 JA, *this, ResponseFileSupport::AtFileCurCP(), Exec, CmdArgs, Inputs)); 97 } 98 99 // CloudABI - CloudABI tool chain which can call ld(1) directly. 100 101 CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple, 102 const ArgList &Args) 103 : Generic_ELF(D, Triple, Args) { 104 SmallString<128> P(getDriver().Dir); 105 llvm::sys::path::append(P, "..", getTriple().str(), "lib"); 106 getFilePaths().push_back(std::string(P.str())); 107 } 108 109 void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 110 llvm::opt::ArgStringList &CC1Args) const { 111 SmallString<128> P(getDriver().Dir); 112 llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1"); 113 addSystemInclude(DriverArgs, CC1Args, P.str()); 114 } 115 116 void CloudABI::AddCXXStdlibLibArgs(const ArgList &Args, 117 ArgStringList &CmdArgs) const { 118 CmdArgs.push_back("-lc++"); 119 CmdArgs.push_back("-lc++abi"); 120 CmdArgs.push_back("-lunwind"); 121 } 122 123 Tool *CloudABI::buildLinker() const { 124 return new tools::cloudabi::Linker(*this); 125 } 126 127 bool CloudABI::isPIEDefault() const { 128 // Only enable PIE on architectures that support PC-relative 129 // addressing. PC-relative addressing is required, as the process 130 // startup code must be able to relocate itself. 131 switch (getTriple().getArch()) { 132 case llvm::Triple::aarch64: 133 case llvm::Triple::x86_64: 134 return true; 135 default: 136 return false; 137 } 138 } 139 140 SanitizerMask CloudABI::getSupportedSanitizers() const { 141 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 142 Res |= SanitizerKind::SafeStack; 143 return Res; 144 } 145 146 SanitizerMask CloudABI::getDefaultSanitizers() const { 147 return SanitizerKind::SafeStack; 148 } 149