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
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const25 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>(JA, *this,
96 ResponseFileSupport::AtFileCurCP(),
97 Exec, CmdArgs, Inputs, Output));
98 }
99
100 // CloudABI - CloudABI tool chain which can call ld(1) directly.
101
CloudABI(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)102 CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple,
103 const ArgList &Args)
104 : Generic_ELF(D, Triple, Args) {
105 SmallString<128> P(getDriver().Dir);
106 llvm::sys::path::append(P, "..", getTriple().str(), "lib");
107 getFilePaths().push_back(std::string(P.str()));
108 }
109
addLibCxxIncludePaths(const llvm::opt::ArgList & DriverArgs,llvm::opt::ArgStringList & CC1Args) const110 void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
111 llvm::opt::ArgStringList &CC1Args) const {
112 SmallString<128> P(getDriver().Dir);
113 llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1");
114 addSystemInclude(DriverArgs, CC1Args, P.str());
115 }
116
AddCXXStdlibLibArgs(const ArgList & Args,ArgStringList & CmdArgs) const117 void CloudABI::AddCXXStdlibLibArgs(const ArgList &Args,
118 ArgStringList &CmdArgs) const {
119 CmdArgs.push_back("-lc++");
120 CmdArgs.push_back("-lc++abi");
121 CmdArgs.push_back("-lunwind");
122 }
123
buildLinker() const124 Tool *CloudABI::buildLinker() const {
125 return new tools::cloudabi::Linker(*this);
126 }
127
isPIEDefault() const128 bool CloudABI::isPIEDefault() const {
129 // Only enable PIE on architectures that support PC-relative
130 // addressing. PC-relative addressing is required, as the process
131 // startup code must be able to relocate itself.
132 switch (getTriple().getArch()) {
133 case llvm::Triple::aarch64:
134 case llvm::Triple::x86_64:
135 return true;
136 default:
137 return false;
138 }
139 }
140
getSupportedSanitizers() const141 SanitizerMask CloudABI::getSupportedSanitizers() const {
142 SanitizerMask Res = ToolChain::getSupportedSanitizers();
143 Res |= SanitizerKind::SafeStack;
144 return Res;
145 }
146
getDefaultSanitizers() const147 SanitizerMask CloudABI::getDefaultSanitizers() const {
148 return SanitizerKind::SafeStack;
149 }
150