clang  10.0.0svn
CloudABI.cpp
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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"
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 
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 
100 CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple,
101  const ArgList &Args)
102  : Generic_ELF(D, Triple, Args) {
104  llvm::sys::path::append(P, "..", getTriple().str(), "lib");
105  getFilePaths().push_back(P.str());
106 }
107 
108 void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
109  llvm::opt::ArgStringList &CC1Args) const {
111  llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1");
112  addSystemInclude(DriverArgs, CC1Args, P.str());
113 }
114 
115 void 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 
123  return new tools::cloudabi::Linker(*this);
124 }
125 
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 
141  Res |= SanitizerKind::SafeStack;
142  return Res;
143 }
144 
146  return SanitizerKind::SafeStack;
147 }
SanitizerMask getDefaultSanitizers() const override
Return sanitizers which are enabled by default.
Definition: CloudABI.cpp:145
StringRef P
bool isUsingLTO() const
Returns true if we are performing any kind of LTO.
Definition: Driver.h:538
LTOKind getLTOMode() const
Get the specific kind of LTO being performed.
Definition: Driver.h:541
std::string GetLinkerPath() const
Returns the linker path, respecting the -fuse-ld= argument to determine the linker suffix or name...
Definition: ToolChain.cpp:492
const char * getFilename() const
Definition: InputInfo.h:83
void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const override
AddCXXStdlibLibArgs - Add the system specific linker arguments to use for the given C++ standard libr...
Definition: CloudABI.cpp:115
void AddGoldPlugin(const ToolChain &ToolChain, const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs, const InputInfo &Output, const InputInfo &Input, bool IsThinLTO)
InputInfo - Wrapper for information about an input source.
Definition: InputInfo.h:22
std::string GetFilePath(const char *Name) const
Definition: ToolChain.cpp:484
path_list & getFilePaths()
Definition: ToolChain.h:231
Driver - Encapsulate logic for constructing compilation processes from a set of gcc-driver-like comma...
Definition: Driver.h:59
SanitizerMask getSupportedSanitizers() const override
Return sanitizers which are available in this toolchain.
Definition: CloudABI.cpp:139
void addCommand(std::unique_ptr< Command > C)
Definition: Compilation.h:205
bool isPIEDefault() const override
Test whether this toolchain defaults to PIE.
Definition: CloudABI.cpp:126
void ConstructJob(Compilation &C, const JobAction &JA, const InputInfo &Output, const InputInfoList &Inputs, const llvm::opt::ArgList &TCArgs, const char *LinkingOutput) const override
ConstructJob - Construct jobs to perform the action JA, writing to Output and with Inputs...
Definition: CloudABI.cpp:25
llvm::Triple::ArchType getArch() const
Definition: ToolChain.h:209
void AddFilePathLibArgs(const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const
AddFilePathLibArgs - Add each thing in getFilePaths() as a "-L" option.
Definition: ToolChain.cpp:868
Tool * buildLinker() const override
Definition: CloudABI.cpp:122
const Driver & getDriver() const
Definition: ToolChain.h:193
static void addSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory to CC1 arguments.
Definition: ToolChain.cpp:782
bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const
Returns if the C++ standard library should be linked in.
Definition: ToolChain.cpp:845
Dataflow Directional Tag Classes.
void AddLinkerInputs(const ToolChain &TC, const InputInfoList &Inputs, const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs, const JobAction &JA)
std::string SysRoot
sysroot, if present
Definition: Driver.h:147
Tool - Information on a specific compilation tool.
Definition: Tool.h:33
virtual bool isPIEDefault() const =0
Test whether this toolchain defaults to PIE.
Compilation - A set of tasks to perform for a single driver invocation.
Definition: Compilation.h:45
const llvm::Triple & getTriple() const
Definition: ToolChain.h:195
virtual SanitizerMask getSupportedSanitizers() const
Return sanitizers which are available in this toolchain.
Definition: ToolChain.cpp:904
bool isNothing() const
Definition: InputInfo.h:74
bool isFilename() const
Definition: InputInfo.h:75
void addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
Definition: CloudABI.cpp:108
virtual void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const
AddCXXStdlibLibArgs - Add the system specific linker arguments to use for the given C++ standard libr...
Definition: ToolChain.cpp:851
ToolChain - Access to tools for a single platform.
Definition: ToolChain.h:88