1 files changed, 45 insertions, 0 deletions

diff --git a/unittests/Support/raw_ostream_test.cpp b/unittests/Support/raw_ostream_test.cpp
index feb0152..bd2e95c 100644
--- a/unittests/Support/raw_ostream_test.cpp
+++ b/unittests/Support/raw_ostream_test.cpp
@@ -8,6 +8,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "gtest/gtest.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
@@ -20,6 +22,23 @@ template<typename T> std::string printToString(const T &Value) {
   return res;    
 }
 
+/// printToString - Print the given value to a stream which only has \arg
+/// BytesLeftInBuffer bytes left in the buffer. This is useful for testing edge
+/// cases in the buffer handling logic.
+template<typename T> std::string printToString(const T &Value,
+                                               unsigned BytesLeftInBuffer) {
+  // FIXME: This is relying on internal knowledge of how raw_ostream works to
+  // get the buffer position right.
+  SmallString<256> SVec;
+  assert(BytesLeftInBuffer < 256 && "Invalid buffer count!");
+  llvm::raw_svector_ostream OS(SVec);
+  unsigned StartIndex = 256 - BytesLeftInBuffer;
+  for (unsigned i = 0; i != StartIndex; ++i)
+    OS << '?';
+  OS << Value;
+  return OS.str().substr(StartIndex);
+}
+
 template<typename T> std::string printToStringUnbuffered(const T &Value) {
   std::string res;
   llvm::raw_string_ostream OS(res);
@@ -53,6 +72,10 @@ TEST(raw_ostreamTest, Types_Buffered) {
   EXPECT_EQ("0x0", printToString((void*) 0));
   EXPECT_EQ("0xbeef", printToString((void*) 0xbeef));
   EXPECT_EQ("0xdeadbeef", printToString((void*) 0xdeadbeef));
+
+  // Min and max.
+  EXPECT_EQ("18446744073709551615", printToString(UINT64_MAX));
+  EXPECT_EQ("-9223372036854775808", printToString(INT64_MIN));
 }
 
 TEST(raw_ostreamTest, Types_Unbuffered) {  
@@ -80,6 +103,28 @@ TEST(raw_ostreamTest, Types_Unbuffered) {
   EXPECT_EQ("0x0", printToStringUnbuffered((void*) 0));
   EXPECT_EQ("0xbeef", printToStringUnbuffered((void*) 0xbeef));
   EXPECT_EQ("0xdeadbeef", printToStringUnbuffered((void*) 0xdeadbeef));
+
+  // Min and max.
+  EXPECT_EQ("18446744073709551615", printToStringUnbuffered(UINT64_MAX));
+  EXPECT_EQ("-9223372036854775808", printToStringUnbuffered(INT64_MIN));
+}
+
+TEST(raw_ostreamTest, BufferEdge) {  
+  EXPECT_EQ("1.20", printToString(format("%.2f", 1.2), 1));
+  EXPECT_EQ("1.20", printToString(format("%.2f", 1.2), 2));
+  EXPECT_EQ("1.20", printToString(format("%.2f", 1.2), 3));
+  EXPECT_EQ("1.20", printToString(format("%.2f", 1.2), 4));
+  EXPECT_EQ("1.20", printToString(format("%.2f", 1.2), 10));
+}
+
+TEST(raw_ostreamTest, TinyBuffer) {
+  std::string Str;
+  raw_string_ostream OS(Str);
+  OS.SetBufferSize(1);
+  OS << "hello";
+  OS << 1;
+  OS << 'w' << 'o' << 'r' << 'l' << 'd';
+  EXPECT_EQ("hello1world", OS.str());
 }
 
 }