[lanai] Add Lanai backend to clang driver.

Changes to clang to add Lanai backend. Adds a new target, ABI and toolchain.

General Lanai backend discussion on llvm-dev thread "[RFC] Lanai backend" (http://lists.llvm.org/pipermail/llvm-dev/2016-February/095118.html).

Differential Revision: http://reviews.llvm.org/D17002

llvm-svn: 264655

4 files changed, 50 insertions, 0 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 75dcfc96cd8..e434e68c7b9 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2459,6 +2459,9 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
       case llvm::Triple::hexagon:
         TC = new toolchains::HexagonToolChain(*this, Target, Args);
         break;
+      case llvm::Triple::lanai:
+        TC = new toolchains::LanaiToolChain(*this, Target, Args);
+        break;
       case llvm::Triple::xcore:
         TC = new toolchains::XCoreToolChain(*this, Target, Args);
         break;
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 458fd03feda..49283a9c201 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -874,6 +874,14 @@ private:
   std::string LibSuffix;
 };
 
+class LLVM_LIBRARY_VISIBILITY LanaiToolChain : public Generic_ELF {
+public:
+  LanaiToolChain(const Driver &D, const llvm::Triple &Triple,
+                 const llvm::opt::ArgList &Args)
+      : Generic_ELF(D, Triple, Args) {}
+  bool IsIntegratedAssemblerDefault() const override { return true; }
+};
+
 class LLVM_LIBRARY_VISIBILITY HexagonToolChain : public Linux {
 protected:
   GCCVersion GCCLibAndIncVersion;
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index e725e5af488..118e1afb214 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1619,6 +1619,13 @@ static std::string getR600TargetGPU(const ArgList &Args) {
   return "";
 }
 
+static std::string getLanaiTargetCPU(const ArgList &Args) {
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    return A->getValue();
+  }
+  return "";
+}
+
 void Clang::AddSparcTargetArgs(const ArgList &Args,
                                ArgStringList &CmdArgs) const {
   const Driver &D = getToolChain().getDriver();
@@ -1836,6 +1843,9 @@ static std::string getCPUName(const ArgList &Args, const llvm::Triple &T,
     return "hexagon" +
            toolchains::HexagonToolChain::GetTargetCPUVersion(Args).str();
 
+  case llvm::Triple::lanai:
+    return getLanaiTargetCPU(Args);
+
   case llvm::Triple::systemz:
     return getSystemZTargetCPU(Args);
 
@@ -2145,6 +2155,29 @@ void Clang::AddHexagonTargetArgs(const ArgList &Args,
   CmdArgs.push_back("-machine-sink-split=0");
 }
 
+void Clang::AddLanaiTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    StringRef CPUName = A->getValue();
+
+    CmdArgs.push_back("-target-cpu");
+    CmdArgs.push_back(Args.MakeArgString(CPUName));
+  }
+  if (Arg *A = Args.getLastArg(options::OPT_mregparm_EQ)) {
+    StringRef Value = A->getValue();
+    // Only support mregparm=4 to support old usage. Report error for all other
+    // cases.
+    int Mregparm;
+    if (Value.getAsInteger(10, Mregparm)) {
+      if (Mregparm != 4) {
+        getToolChain().getDriver().Diag(
+            diag::err_drv_unsupported_option_argument)
+            << A->getOption().getName() << Value;
+      }
+    }
+  }
+}
+
 void Clang::AddWebAssemblyTargetArgs(const ArgList &Args,
                                      ArgStringList &CmdArgs) const {
   // Default to "hidden" visibility.
@@ -4176,6 +4209,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     AddX86TargetArgs(Args, CmdArgs);
     break;
 
+  case llvm::Triple::lanai:
+    AddLanaiTargetArgs(Args, CmdArgs);
+    break;
+
   case llvm::Triple::hexagon:
     AddHexagonTargetArgs(Args, CmdArgs);
     break;
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 6884cd42f3b..c9d5c2238d6 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -82,6 +82,8 @@ private:
                         llvm::opt::ArgStringList &CmdArgs) const;
   void AddHexagonTargetArgs(const llvm::opt::ArgList &Args,
                             llvm::opt::ArgStringList &CmdArgs) const;
+  void AddLanaiTargetArgs(const llvm::opt::ArgList &Args,
+                          llvm::opt::ArgStringList &CmdArgs) const;
   void AddWebAssemblyTargetArgs(const llvm::opt::ArgList &Args,
                                 llvm::opt::ArgStringList &CmdArgs) const;