[Bash-autocompletion] Auto complete cc1 options if -cc1 is specified

Summary:
We don't want to autocomplete flags whose Flags class has `NoDriverOption` when argv[1] is not `-cc1`.

Another idea for this implementation is to make --autocomplete a cc1
option and handle it in clang Frontend, by porting --autocomplete
handler from Driver to Frontend, so that we can handle Driver options
and CC1 options in unified manner.

Differential Revision: https://reviews.llvm.org/D34770

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307479 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 24 insertions, 7 deletions

diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 8031d78a21..42478013cc 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1261,11 +1261,20 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     StringRef PassedFlags = A->getValue();
     std::vector<std::string> SuggestedCompletions;
 
+    unsigned short DisableFlags = options::NoDriverOption | options::Unsupported | options::Ignored;
+    // We want to show cc1-only options only when clang is invoked as "clang -cc1".
+    // When clang is invoked as "clang -cc1", we add "#" to the beginning of an --autocomplete
+    // option so that the clang driver can distinguish whether it is requested to show cc1-only options or not.
+    if (PassedFlags[0] == '#') {
+      DisableFlags &= ~options::NoDriverOption;
+      PassedFlags = PassedFlags.substr(1);
+    }
+
     if (PassedFlags.find(',') == StringRef::npos) {
       // If the flag is in the form of "--autocomplete=-foo",
       // we were requested to print out all option names that start with "-foo".
       // For example, "--autocomplete=-fsyn" is expanded to "-fsyntax-only".
-      SuggestedCompletions = Opts->findByPrefix(PassedFlags);
+      SuggestedCompletions = Opts->findByPrefix(PassedFlags, DisableFlags);
     } else {
       // If the flag is in the form of "--autocomplete=foo,bar", we were
       // requested to print out all option values for "-foo" that start with
diff --git a/test/Driver/autocomplete.c b/test/Driver/autocomplete.c
index f0bdcce570..e9e2e992ba 100644
--- a/test/Driver/autocomplete.c
+++ b/test/Driver/autocomplete.c
@@ -36,3 +36,7 @@
 // MTHREADMODELALL: posix single
 // RUN: %clang --autocomplete=-mrelocation-model, | FileCheck %s -check-prefix=MRELOCMODELALL
 // MRELOCMODELALL: dynamic-no-pic pic ropi ropi-rwpi rwpi static
+// RUN: %clang --autocomplete=-mrelocation-mode | FileCheck %s -check-prefix=MRELOCMODEL_CLANG
+// MRELOCMODEL_CLANG-NOT: -mrelocation-model
+// RUN: %clang --autocomplete=#-mrelocation-mode | FileCheck %s -check-prefix=MRELOCMODEL_CC1
+// MRELOCMODEL_CC1: -mrelocation-model
diff --git a/utils/bash-autocomplete.sh b/utils/bash-autocomplete.sh
index bab193c56b..1e38bcfcaa 100644
--- a/utils/bash-autocomplete.sh
+++ b/utils/bash-autocomplete.sh
@@ -27,25 +27,29 @@ _clang()
   w1="${COMP_WORDS[$cword - 1]}"
   if [[ $cword > 1 ]]; then
     w2="${COMP_WORDS[$cword - 2]}"
+  # Clang want to know if -cc1 or -Xclang option is specified or not, because we don't want to show
+  # cc1 options otherwise.
+  if [[ "${COMP_WORDS[1]}" == "-cc1" || "$w1" == "-Xclang" ]]; then
+    arg="#"
   fi
   if [[ "$cur" == -* ]]; then
     # -foo<tab>
-    arg="$cur"
+    arg="$arg$cur"
   elif [[ "$w1" == -*  && "$cur" == '=' ]]; then
     # -foo=<tab>
-    arg="$w1=,"
+    arg="$arg$w1=,"
   elif [[ "$cur" == -*= ]]; then
     # -foo=<tab>
-    arg="$cur,"
+    arg="$arg$cur,"
   elif [[ "$w1" == -* ]]; then
     # -foo <tab> or -foo bar<tab>
-    arg="$w1,$cur"
+    arg="$arg$w1,$cur"
   elif [[ "$w2" == -* && "$w1" == '=' ]]; then
     # -foo=bar<tab>
-    arg="$w2=,$cur"
+    arg="$arg$w2=,$cur"
   elif [[ ${cur: -1} != '=' && ${cur/=} != $cur ]]; then
     # -foo=bar<tab>
-    arg="${cur%=*}=,${cur#*=}"
+    arg="$arg${cur%=*}=,${cur#*=}"
   fi
 
   # expand ~ to $HOME