1 //===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- 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 "WebAssembly.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/Option/ArgList.h"
16 
17 using namespace clang::driver;
18 using namespace clang::driver::tools;
19 using namespace clang::driver::toolchains;
20 using namespace clang;
21 using namespace llvm::opt;
22 
23 wasm::Linker::Linker(const ToolChain &TC)
24   : GnuTool("wasm::Linker", "lld", TC) {}
25 
26 bool wasm::Linker::isLinkJob() const {
27   return true;
28 }
29 
30 bool wasm::Linker::hasIntegratedCPP() const {
31   return false;
32 }
33 
34 void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
35                                 const InputInfo &Output,
36                                 const InputInfoList &Inputs,
37                                 const ArgList &Args,
38                                 const char *LinkingOutput) const {
39 
40   const ToolChain &ToolChain = getToolChain();
41   const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
42   ArgStringList CmdArgs;
43   CmdArgs.push_back("-flavor");
44   CmdArgs.push_back("wasm");
45 
46   if (Args.hasArg(options::OPT_s))
47     CmdArgs.push_back("--strip-all");
48 
49   Args.AddAllArgs(CmdArgs, options::OPT_L);
50   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
51 
52   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
53     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
54 
55   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
56 
57   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
58     if (ToolChain.ShouldLinkCXXStdlib(Args))
59       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
60 
61     if (Args.hasArg(options::OPT_pthread))
62       CmdArgs.push_back("-lpthread");
63 
64     CmdArgs.push_back("-allow-undefined-file");
65     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("wasm.syms")));
66     CmdArgs.push_back("-lc");
67     AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
68   }
69 
70   CmdArgs.push_back("-o");
71   CmdArgs.push_back(Output.getFilename());
72 
73   C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
74 }
75 
76 WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
77                          const llvm::opt::ArgList &Args)
78   : ToolChain(D, Triple, Args) {
79 
80   assert(Triple.isArch32Bit() != Triple.isArch64Bit());
81 
82   getProgramPaths().push_back(getDriver().getInstalledDir());
83 
84   getFilePaths().push_back(getDriver().SysRoot + "/lib");
85 }
86 
87 bool WebAssembly::IsMathErrnoDefault() const { return false; }
88 
89 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
90 
91 bool WebAssembly::UseObjCMixedDispatch() const { return true; }
92 
93 bool WebAssembly::isPICDefault() const { return false; }
94 
95 bool WebAssembly::isPIEDefault() const { return false; }
96 
97 bool WebAssembly::isPICDefaultForced() const { return false; }
98 
99 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
100 
101 // TODO: Support Objective C stuff.
102 bool WebAssembly::SupportsObjCGC() const { return false; }
103 
104 bool WebAssembly::hasBlocksRuntime() const { return false; }
105 
106 // TODO: Support profiling.
107 bool WebAssembly::SupportsProfiling() const { return false; }
108 
109 bool WebAssembly::HasNativeLLVMSupport() const { return true; }
110 
111 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
112                                         ArgStringList &CC1Args,
113                                         Action::OffloadKind) const {
114   if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
115                          options::OPT_fno_use_init_array, true))
116     CC1Args.push_back("-fuse-init-array");
117 }
118 
119 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
120   return ToolChain::RLT_CompilerRT;
121 }
122 
123 ToolChain::CXXStdlibType WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
124   return ToolChain::CST_Libcxx;
125 }
126 
127 void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
128                                             ArgStringList &CC1Args) const {
129   if (!DriverArgs.hasArg(options::OPT_nostdinc))
130     addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include");
131 }
132 
133 void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
134                                                ArgStringList &CC1Args) const {
135   if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
136       !DriverArgs.hasArg(options::OPT_nostdincxx))
137     addSystemInclude(DriverArgs, CC1Args,
138                      getDriver().SysRoot + "/include/c++/v1");
139 }
140 
141 Tool *WebAssembly::buildLinker() const {
142   return new tools::wasm::Linker(*this);
143 }
144