Creating branches/google/stable and tags/google/stable/2019-05-14 from r360103upstream/google/stable

git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/google/stable@360714 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 40 insertions, 14 deletions

diff --git a/lib/Driver/ToolChains/WebAssembly.cpp b/lib/Driver/ToolChains/WebAssembly.cpp
index 6310d5faba..657f686f8a 100644
--- a/lib/Driver/ToolChains/WebAssembly.cpp
+++ b/lib/Driver/ToolChains/WebAssembly.cpp
@@ -1,9 +1,8 @@
 //===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,6 +12,8 @@
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Option/ArgList.h"
 
 using namespace clang::driver;
@@ -37,6 +38,25 @@ bool wasm::Linker::isLinkJob() const { return true; }
 
 bool wasm::Linker::hasIntegratedCPP() const { return false; }
 
+std::string wasm::Linker::getLinkerPath(const ArgList &Args) const {
+  const ToolChain &ToolChain = getToolChain();
+  if (const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
+    StringRef UseLinker = A->getValue();
+    if (!UseLinker.empty()) {
+      if (llvm::sys::path::is_absolute(UseLinker) &&
+          llvm::sys::fs::can_execute(UseLinker))
+        return UseLinker;
+
+      // Accept 'lld', and 'ld' as aliases for the default linker
+      if (UseLinker != "lld" && UseLinker != "ld")
+        ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
+            << A->getAsString(Args);
+    }
+  }
+
+  return ToolChain.GetProgramPath(ToolChain.getDefaultLinker());
+}
+
 void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                 const InputInfo &Output,
                                 const InputInfoList &Inputs,
@@ -44,7 +64,7 @@ void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                 const char *LinkingOutput) const {
 
   const ToolChain &ToolChain = getToolChain();
-  const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
+  const char *Linker = Args.MakeArgString(getLinkerPath(Args));
   ArgStringList CmdArgs;
 
   if (Args.hasArg(options::OPT_s))
@@ -63,8 +83,10 @@ void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     if (ToolChain.ShouldLinkCXXStdlib(Args))
       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
 
-    if (Args.hasArg(options::OPT_pthread))
+    if (Args.hasArg(options::OPT_pthread)) {
       CmdArgs.push_back("-lpthread");
+      CmdArgs.push_back("--shared-memory");
+    }
 
     CmdArgs.push_back("-lc");
     AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
@@ -124,6 +146,18 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
   if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
                          options::OPT_fno_use_init_array, true))
     CC1Args.push_back("-fuse-init-array");
+
+  // '-pthread' implies '-target-feature +atomics'
+  if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
+                         false)) {
+    if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
+                           false))
+      getDriver().Diag(diag::err_drv_argument_not_allowed_with)
+          << "-pthread"
+          << "-mno-atomics";
+    CC1Args.push_back("-target-feature");
+    CC1Args.push_back("+atomics");
+  }
 }
 
 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
@@ -181,14 +215,6 @@ void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
   }
 }
 
-std::string WebAssembly::getThreadModel() const {
-  // The WebAssembly MVP does not yet support threads; for now, use the
-  // "single" threading model, which lowers atomics to non-atomic operations.
-  // When threading support is standardized and implemented in popular engines,
-  // this override should be removed.
-  return "single";
-}
-
 Tool *WebAssembly::buildLinker() const {
   return new tools::wasm::Linker(*this);
 }