X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTableGen%2FTableGenBackend.cpp;h=79d567753a6cd6856bf0f532785b51291133d2d3;hb=45d53fd4c4d04b6feb2bc898f0a10ca98643edef;hp=89d3f5e81e7bfa60aa9292cf4541a9790f7d5bd5;hpb=764dc754fe52c3a61363fad341b68be397103668;p=oota-llvm.git

diff --git a/lib/TableGen/TableGenBackend.cpp b/lib/TableGen/TableGenBackend.cpp
index 89d3f5e81e7..79d567753a6 100644
--- a/lib/TableGen/TableGenBackend.cpp
+++ b/lib/TableGen/TableGenBackend.cpp
@@ -11,13 +11,46 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/ADT/Twine.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/TableGen/TableGenBackend.h"
+#include <algorithm>
+
 using namespace llvm;
 
+const size_t MAX_LINE_LEN = 80U;
+
+static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
+                      StringRef Suffix) {
+  size_t Pos = (size_t)OS.tell();
+  assert((MAX_LINE_LEN - Prefix.str().size() - Suffix.size() > 0) &&
+    "header line exceeds max limit");
+  OS << Prefix;
+  const size_t e = MAX_LINE_LEN - Suffix.size();
+  for (size_t i = (size_t)OS.tell() - Pos; i < e; ++i)
+    OS << Fill;
+  OS << Suffix << '\n';
+}
+
 void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
-  OS << "//===- TableGen'erated file -------------------------------------*-"
-       " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
-       "d file, do not edit!\n//\n//===------------------------------------"
-       "----------------------------------===//\n\n";
+  printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
+  printLine(OS, "|*", ' ', "*|");
+  size_t Pos = 0U;
+  size_t PosE;
+  StringRef Prefix("|*");
+  StringRef Suffix(" *|");
+  do{
+    size_t PSLen = Suffix.size() + Prefix.size();
+    PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ?
+      Desc.size() :
+      MAX_LINE_LEN - PSLen);
+    printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix);
+    Pos = PosE;
+  } while(Pos < Desc.size());
+  printLine(OS, Prefix, ' ', Suffix);
+  printLine(OS, Prefix + " Automatically generated file, do not edit!", ' ',
+    Suffix);
+  printLine(OS, Prefix, ' ', Suffix);
+  printLine(OS, "\\*===", '-', "===*/");
+  OS << '\n';
 }