clang  8.0.0svn
CloudABI.cpp
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1 //===--- CloudABI.cpp - CloudABI 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 "CloudABI.h"
11 #include "InputInfo.h"
12 #include "CommonArgs.h"
14 #include "clang/Driver/Driver.h"
15 #include "clang/Driver/Options.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/Option/ArgList.h"
18 #include "llvm/Support/Path.h"
19 
20 using namespace clang::driver;
21 using namespace clang::driver::tools;
22 using namespace clang::driver::toolchains;
23 using namespace clang;
24 using namespace llvm::opt;
25 
27  const InputInfo &Output,
28  const InputInfoList &Inputs,
29  const ArgList &Args,
30  const char *LinkingOutput) const {
31  const ToolChain &ToolChain = getToolChain();
32  const Driver &D = ToolChain.getDriver();
33  ArgStringList CmdArgs;
34 
35  // Silence warning for "clang -g foo.o -o foo"
36  Args.ClaimAllArgs(options::OPT_g_Group);
37  // and "clang -emit-llvm foo.o -o foo"
38  Args.ClaimAllArgs(options::OPT_emit_llvm);
39  // and for "clang -w foo.o -o foo". Other warning options are already
40  // handled somewhere else.
41  Args.ClaimAllArgs(options::OPT_w);
42 
43  if (!D.SysRoot.empty())
44  CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
45 
46  // CloudABI only supports static linkage.
47  CmdArgs.push_back("-Bstatic");
48  CmdArgs.push_back("--no-dynamic-linker");
49 
50  // Provide PIE linker flags in case PIE is default for the architecture.
51  if (ToolChain.isPIEDefault()) {
52  CmdArgs.push_back("-pie");
53  CmdArgs.push_back("-zrelro");
54  }
55 
56  CmdArgs.push_back("--eh-frame-hdr");
57  CmdArgs.push_back("--gc-sections");
58 
59  if (Output.isFilename()) {
60  CmdArgs.push_back("-o");
61  CmdArgs.push_back(Output.getFilename());
62  } else {
63  assert(Output.isNothing() && "Invalid output.");
64  }
65 
66  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
67  CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
68  CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
69  }
70 
71  Args.AddAllArgs(CmdArgs, options::OPT_L);
72  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
73  Args.AddAllArgs(CmdArgs,
74  {options::OPT_T_Group, options::OPT_e, options::OPT_s,
75  options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
76 
77  if (D.isUsingLTO()) {
78  assert(!Inputs.empty() && "Must have at least one input.");
79  AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
80  D.getLTOMode() == LTOK_Thin);
81  }
82 
83  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
84 
85  if (ToolChain.ShouldLinkCXXStdlib(Args))
86  ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
87  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
88  CmdArgs.push_back("-lc");
89  CmdArgs.push_back("-lcompiler_rt");
90  }
91 
92  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
93  CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
94 
95  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
96  C.addCommand(llvm::make_unique<Command>(JA, *this, 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) {
105  llvm::sys::path::append(P, "..", getTriple().str(), "lib");
106  getFilePaths().push_back(P.str());
107 }
108 
109 void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
110  llvm::opt::ArgStringList &CC1Args) const {
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 
124  return new tools::cloudabi::Linker(*this);
125 }
126 
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 
142  Res |= SanitizerKind::SafeStack;
143  return Res;
144 }
145 
147  return SanitizerKind::SafeStack;
148 }
SanitizerMask getDefaultSanitizers() const override
Return sanitizers which are enabled by default.
Definition: CloudABI.cpp:146
StringRef P
bool isUsingLTO() const
Returns true if we are performing any kind of LTO.
Definition: Driver.h:518
LTOKind getLTOMode() const
Get the specific kind of LTO being performed.
Definition: Driver.h:521
std::string GetLinkerPath() const
Returns the linker path, respecting the -fuse-ld= argument to determine the linker suffix or name...
Definition: ToolChain.cpp:435
const char * getFilename() const
Definition: InputInfo.h:84
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:116
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:23
std::string GetFilePath(const char *Name) const
Definition: ToolChain.cpp:427
path_list & getFilePaths()
Definition: ToolChain.h:222
Driver - Encapsulate logic for constructing compilation processes from a set of gcc-driver-like comma...
Definition: Driver.h:58
SanitizerMask getSupportedSanitizers() const override
Return sanitizers which are available in this toolchain.
Definition: CloudABI.cpp:140
return Out str()
void addCommand(std::unique_ptr< Command > C)
Definition: Compilation.h:206
bool isPIEDefault() const override
Test whether this toolchain defaults to PIE.
Definition: CloudABI.cpp:127
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:26
llvm::Triple::ArchType getArch() const
Definition: ToolChain.h:200
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:774
Tool * buildLinker() const override
Definition: CloudABI.cpp:123
const Driver & getDriver() const
Definition: ToolChain.h:184
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:698
bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const
Returns if the C++ standard library should be linked in.
Definition: ToolChain.cpp:751
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:148
Tool - Information on a specific compilation tool.
Definition: Tool.h:34
uint64_t SanitizerMask
Definition: Sanitizers.h:26
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:46
const llvm::Triple & getTriple() const
Definition: ToolChain.h:186
virtual SanitizerMask getSupportedSanitizers() const
Return sanitizers which are available in this toolchain.
Definition: ToolChain.cpp:814
bool isNothing() const
Definition: InputInfo.h:75
bool isFilename() const
Definition: InputInfo.h:76
void addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
Definition: CloudABI.cpp:109
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:757
ToolChain - Access to tools for a single platform.
Definition: ToolChain.h:87