From 88dbc5e6c3f29276fb9d4d1110094c08b1550e42 Mon Sep 17 00:00:00 2001
From: Sean Silva <silvas@purdue.edu>
Date: Tue, 9 Oct 2012 20:29:03 +0000
Subject: tblgen: Move dependency file output to a separate function.

This keeps it out of the main flow of TableGenMain.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165542 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/TableGen/Main.cpp | 52 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 21 deletions(-)

(limited to 'lib/TableGen')

diff --git a/lib/TableGen/Main.cpp b/lib/TableGen/Main.cpp
index 2c37aa7..84de925 100644
--- a/lib/TableGen/Main.cpp
+++ b/lib/TableGen/Main.cpp
@@ -47,6 +47,34 @@ namespace {
               cl::value_desc("directory"), cl::Prefix);
 }
 
+/// \brief Create a dependency file for `-d` option.
+///
+/// This functionality is really only for the benefit of the build system.
+/// It is similar to GCC's `-M*` family of options.
+static int handleDependencies(const TGParser &Parser, const char *argv0) {
+  if (OutputFilename == "-") {
+    errs() << argv0 << ": the option -d must be used together with -o\n";
+    return 1;
+  }
+  std::string Error;
+  tool_output_file DepOut(DependFilename.c_str(), Error);
+  if (!Error.empty()) {
+    errs() << argv0 << ": error opening " << DependFilename
+      << ":" << Error << "\n";
+    return 1;
+  }
+  DepOut.os() << OutputFilename << ":";
+  const std::vector<std::string> &Dependencies = Parser.getDependencies();
+  for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
+                                                E = Dependencies.end();
+       I != E; ++I) {
+    DepOut.os() << " " << (*I);
+  }
+  DepOut.os() << "\n";
+  DepOut.keep();
+  return 0;
+}
+
 namespace llvm {
 
 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
@@ -82,27 +110,9 @@ int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
         << ":" << Error << "\n";
       return 1;
     }
-    if (!DependFilename.empty()) {
-      if (OutputFilename == "-") {
-        errs() << argv0 << ": the option -d must be used together with -o\n";
-        return 1;
-      }
-      tool_output_file DepOut(DependFilename.c_str(), Error);
-      if (!Error.empty()) {
-        errs() << argv0 << ": error opening " << DependFilename
-          << ":" << Error << "\n";
-        return 1;
-      }
-      DepOut.os() << OutputFilename << ":";
-      const std::vector<std::string> &Dependencies = Parser.getDependencies();
-      for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
-                                                    E = Dependencies.end();
-           I != E; ++I) {
-        DepOut.os() << " " << (*I);
-      }
-      DepOut.os() << "\n";
-      DepOut.keep();
-    }
+    if (!DependFilename.empty())
+      if (int Ret = handleDependencies(Parser, argv0))
+        return Ret;
 
     if (MainFn(Out.os(), Records))
       return 1;
-- 
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