From f26d8bc4406be1311a38fd1761d5ddeb2f5a38b6 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Tue, 24 Sep 2013 13:28:24 +0000
Subject: [PATCH] Remove a use of OPT_m_Joined.

This patch turns the -mv* hexagon options into aliases. We should really produce
errors for invalid versions in the driver, but this patch preserves the old
behavior for now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191298 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/Driver/Options.td | 10 ++++++
 lib/Driver/ToolChains.cpp       | 63 ++++++++++++++++++---------------
 2 files changed, 45 insertions(+), 28 deletions(-)

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 529d03c422..419719d06e 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1336,6 +1336,16 @@ def _write_dependencies : Flag<["--"], "write-dependencies">, Alias<MD>;
 def _write_user_dependencies : Flag<["--"], "write-user-dependencies">, Alias<MMD>;
 def _ : Joined<["--"], "">, Flags<[Unsupported]>;
 def mieee_rnd_near : Flag<["-"], "mieee-rnd-near">, Group<m_hexagon_Features_Group>;
+def mv1 : Flag<["-"], "mv1">, Group<m_hexagon_Features_Group>, Alias<march_EQ>,
+          AliasArgs<["v1"]>;
+def mv2 : Flag<["-"], "mv2">, Group<m_hexagon_Features_Group>, Alias<march_EQ>,
+          AliasArgs<["v2"]>;
+def mv3 : Flag<["-"], "mv3">, Group<m_hexagon_Features_Group>, Alias<march_EQ>,
+          AliasArgs<["v3"]>;
+def mv4 : Flag<["-"], "mv4">, Group<m_hexagon_Features_Group>, Alias<march_EQ>,
+          AliasArgs<["v4"]>;
+def mv5 : Flag<["-"], "mv5">, Group<m_hexagon_Features_Group>, Alias<march_EQ>,
+          AliasArgs<["v5"]>;
 
 // These are legacy user-facing driver-level option spellings. They are always
 // aliases for options that are spelled using the more common Unix / GNU flag
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index a006b52c5d..976f65c0e6 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1671,40 +1671,47 @@ Hexagon_TC::GetCXXStdlibType(const ArgList &Args) const {
   return ToolChain::CST_Libstdcxx;
 }
 
-static Arg *GetLastHexagonArchArg(const ArgList &Args)
-{
-  Arg *A = NULL;
-
-  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
-       it != ie; ++it) {
-    if ((*it)->getOption().matches(options::OPT_march_EQ) ||
-        (*it)->getOption().matches(options::OPT_mcpu_EQ)) {
-      A = *it;
-      A->claim();
-    } else if ((*it)->getOption().matches(options::OPT_m_Joined)) {
-      StringRef Value = (*it)->getValue(0);
-      if (Value.startswith("v")) {
-        A = *it;
-        A->claim();
-      }
-    }
+static int getHexagonVersion(const ArgList &Args) {
+  Arg *A = Args.getLastArg(options::OPT_march_EQ, options::OPT_mcpu_EQ);
+  // Select the default CPU (v4) if none was given.
+  if (!A)
+    return 4;
+
+  // FIXME: produce errors if we cannot parse the version.
+  StringRef WhichHexagon = A->getValue();
+  if (WhichHexagon.startswith("hexagonv")) {
+    int Val;
+    if (!WhichHexagon.substr(sizeof("hexagonv") - 1).getAsInteger(10, Val))
+      return Val;
+  }
+  if (WhichHexagon.startswith("v")) {
+    int Val;
+    if (!WhichHexagon.substr(1).getAsInteger(10, Val))
+      return Val;
   }
-  return A;
+
+  // FIXME: should probably be an error.
+  return 4;
 }
 
 StringRef Hexagon_TC::GetTargetCPU(const ArgList &Args)
 {
-  // Select the default CPU (v4) if none was given or detection failed.
-  Arg *A = GetLastHexagonArchArg (Args);
-  if (A) {
-    StringRef WhichHexagon = A->getValue();
-    if (WhichHexagon.startswith("hexagon"))
-      return WhichHexagon.substr(sizeof("hexagon") - 1);
-    if (WhichHexagon != "")
-      return WhichHexagon;
+  int V = getHexagonVersion(Args);
+  // FIXME: We don't support versions < 4. We should error on them.
+  switch (V) {
+  default:
+    llvm_unreachable("Unexpected version");
+  case 5:
+    return "v5";
+  case 4:
+    return "v4";
+  case 3:
+    return "v3";
+  case 2:
+    return "v2";
+  case 1:
+    return "v1";
   }
-
-  return "v4";
 }
 // End Hexagon
 
-- 
2.40.0