New feature: OptionList.

It can be handy to have all information about options gathered in a single place
to provide an overview of all supported options. This patch allows the following:

def Options : OptionList<[
(switch_option "E", (help "Help string")),
(alias_option "quiet", "q")
...
]>;

Tool-specific option properties (like 'append_cmd') have (obviously) no meaning in
this context, so the only properties that are allowed are 'help' and 'required'.

See usage example in examples/Clang.td.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51754 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvmc2/Common.td

@@ -69,6 +69,11 @@ def or;
 def inc_weight;
 def dec_weight;
 
+// Option list - used to specify aliases and sometimes help strings.
+class OptionList<list<dag> l> {
+      list<dag> options = l;
+}
+
 // Map from suffixes to language names
 
 class LangToSuffixes<string str, list<string> lst> {

tools/llvmc2/examples/Clang.td

@@ -4,22 +4,55 @@
 
 include "Common.td"
 
-def clang : Tool<
-[(in_language ["c", "c++", "objective-c"]),
+
+// TOFIX: Add an explicit option list for aliases and things like this.
+def Options : OptionList<[
+(switch_option "E",
+    (help "Stop after the preprocessing stage, do not run the compiler"))
+]>;
+
+class clang_base<string language, dag cmdline> : Tool<
+[(in_language language),
  (out_language "llvm-bitcode"),
  (output_suffix "bc"),
- (cmd_line (case (switch_on "E"), "clang -E $INFILE",
-                 (in_language "c"),
-                     "clang -emit-llvm-bc -x c $INFILE -o $OUTFILE",
-                 (in_language "c++"),
-                     "clang -emit-llvm-bc -x c++ $INFILE -o $OUTFILE",
-                 (in_language "objective-c"),
-                     "clang -emit-llvm-bc -x objective-c$INFILE -o $OUTFILE")),
- (switch_option "E", (stop_compilation), (output_suffix "i"),
-   (help "Stop after the preprocessing stage, do not run the compiler")),
+ (cmd_line cmdline),
+ (switch_option "E", (stop_compilation), (output_suffix "i")),
  (sink)
 ]>;
 
+def clang_c : clang_base<"c",
+(case
+(switch_on "E"),
+    (case
+    (not_empty "o"),
+        "clang -E -x c $INFILE -o $OUTFILE",
+    (default),
+        "clang -E -x c $INFILE"),
+(default),
+    "clang -emit-llvm-bc -x c $INFILE -o $OUTFILE")>;
+
+def clang_cpp : clang_base<"c++",
+(case
+(switch_on "E"),
+    (case
+    (not_empty "o"),
+        "clang -E -x c++ $INFILE -o $OUTFILE",
+    (default),
+        "clang -E -x c++ $INFILE"),
+(default),
+    "clang -emit-llvm-bc -x c++ $INFILE -o $OUTFILE")>;
+
+def clang_objective_c : clang_base<"objective-c",
+(case
+(switch_on "E"),
+    (case
+    (not_empty "o"),
+        "clang -E -x objective-c $INFILE -o $OUTFILE",
+    (default),
+        "clang -E -x objective-c $INFILE"),
+(default),
+    "clang -emit-llvm-bc -x objective-c $INFILE -o $OUTFILE")>;
+
 // Default linker
 def llvm_ld : Tool<
 [(in_language "llvm-bitcode"),
@@ -43,7 +76,11 @@ def LanguageMap : LanguageMap<
 // Compilation graph
 
 def CompilationGraph : CompilationGraph<[
-    Edge<root, clang>,
-    Edge<clang, llvm_ld>
+    Edge<root, clang_c>,
+    Edge<root, clang_cpp>,
+    Edge<root, clang_objective_c>,
+    Edge<clang_c, llvm_ld>,
+    Edge<clang_cpp, llvm_ld>,
+    Edge<clang_objective_c, llvm_ld>
     ]>;