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
19using namespace clang::driver;
20using namespace clang::driver::tools;
21using namespace clang::driver::toolchains;
22using namespace clang;
23using namespace llvm::opt;
24
25void 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    AddGoldPlugin(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, Exec, CmdArgs, Inputs));
96}
97
98// CloudABI - CloudABI tool chain which can call ld(1) directly.
99
100CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple,
101                   const ArgList &Args)
102    : Generic_ELF(D, Triple, Args) {
103  SmallString<128> P(getDriver().Dir);
104  llvm::sys::path::append(P, "..", getTriple().str(), "lib");
105  getFilePaths().push_back(P.str());
106}
107
108void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
109                                     llvm::opt::ArgStringList &CC1Args) const {
110  SmallString<128> P(getDriver().Dir);
111  llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1");
112  addSystemInclude(DriverArgs, CC1Args, P.str());
113}
114
115void CloudABI::AddCXXStdlibLibArgs(const ArgList &Args,
116                                   ArgStringList &CmdArgs) const {
117  CmdArgs.push_back("-lc++");
118  CmdArgs.push_back("-lc++abi");
119  CmdArgs.push_back("-lunwind");
120}
121
122Tool *CloudABI::buildLinker() const {
123  return new tools::cloudabi::Linker(*this);
124}
125
126bool CloudABI::isPIEDefault() const {
127  // Only enable PIE on architectures that support PC-relative
128  // addressing. PC-relative addressing is required, as the process
129  // startup code must be able to relocate itself.
130  switch (getTriple().getArch()) {
131  case llvm::Triple::aarch64:
132  case llvm::Triple::x86_64:
133    return true;
134  default:
135    return false;
136  }
137}
138
139SanitizerMask CloudABI::getSupportedSanitizers() const {
140  SanitizerMask Res = ToolChain::getSupportedSanitizers();
141  Res |= SanitizerKind::SafeStack;
142  return Res;
143}
144
145SanitizerMask CloudABI::getDefaultSanitizers() const {
146  return SanitizerKind::SafeStack;
147}
148