Add support for embedded metadata to LLVM. This introduces two new types of

Constant, MDString and MDNode which can only be used by globals with a name
that starts with "llvm." or as arguments to a function with the same naming
restriction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68420 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 96 insertions, 0 deletions

diff --git a/unittests/VMCore/MetadataTest.cpp b/unittests/VMCore/MetadataTest.cpp
new file mode 100644
index 0000000000..cd258bb170
--- /dev/null
+++ b/unittests/VMCore/MetadataTest.cpp
@@ -0,0 +1,96 @@
+//===- llvm/unittest/VMCore/Metadata.cpp - Metadata unit tests ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/Constants.h"
+#include <sstream>
+
+using namespace llvm;
+
+namespace {
+
+// Test that construction of MDString with different value produces different
+// MDString objects, even with the same string pointer and nulls in the string.
+TEST(MDStringTest, CreateDifferent) {
+  char x[3] = { 'f', 0, 'A' };
+  MDString *s1 = MDString::get(&x[0], &x[3]);
+  x[2] = 'B';
+  MDString *s2 = MDString::get(&x[0], &x[3]);
+  EXPECT_NE(s1, s2);
+}
+
+// Test that creation of MDStrings with the same string contents produces the
+// same MDString object, even with different pointers.
+TEST(MDStringTest, CreateSame) {
+  char x[4] = { 'a', 'b', 'c', 'X' };
+  char y[4] = { 'a', 'b', 'c', 'Y' };
+
+  MDString *s1 = MDString::get(&x[0], &x[3]);
+  MDString *s2 = MDString::get(&y[0], &y[3]);
+  EXPECT_EQ(s1, s2);
+}
+
+// Test that MDString prints out the string we fed it.
+TEST(MDStringTest, PrintingSimple) {
+  char *str = new char[13];
+  strncpy(str, "testing 1 2 3", 13);
+  MDString *s = MDString::get(str, str+13);
+  strncpy(str, "aaaaaaaaaaaaa", 13);
+  delete[] str;
+
+  std::ostringstream oss;
+  s->print(oss);
+  EXPECT_STREQ("{ } !\"testing 1 2 3\"", oss.str().c_str());
+}
+
+// Test printing of MDString with non-printable characters.
+TEST(MDStringTest, PrintingComplex) {
+  char str[5] = {0, '\n', '"', '\\', -1};
+  MDString *s = MDString::get(str+0, str+5);
+  std::ostringstream oss;
+  s->print(oss);
+  EXPECT_STREQ("{ } !\"\\00\\0A\\22\\5C\\FF\"", oss.str().c_str());
+}
+
+// Test the two constructors, and containing other Constants.
+TEST(MDNodeTest, Everything) {
+  char x[3] = { 'a', 'b', 'c' };
+  char y[3] = { '1', '2', '3' };
+
+  MDString *s1 = MDString::get(&x[0], &x[3]);
+  MDString *s2 = MDString::get(&y[0], &y[3]);
+  ConstantInt *CI = ConstantInt::get(APInt(8, 0));
+
+  std::vector<Constant *> V;
+  V.push_back(s1);
+  V.push_back(CI);
+  V.push_back(s2);
+
+  MDNode *n1 = MDNode::get(&V[0], 3);
+  MDNode *n2 = MDNode::get((Constant**)&n1, 1);
+  MDNode *n3 = MDNode::get(&V[0], 3);
+  EXPECT_NE(n1, n2);
+  EXPECT_EQ(n1, n3);
+
+  EXPECT_EQ(3u, n1->getNumOperands());
+  EXPECT_EQ(s1, n1->getOperand(0));
+  EXPECT_EQ(CI, n1->getOperand(1));
+  EXPECT_EQ(s2, n1->getOperand(2));
+
+  EXPECT_EQ(1u, n2->getNumOperands());
+  EXPECT_EQ(n1, n2->getOperand(0));
+
+  std::ostringstream oss1, oss2;
+  n1->print(oss1);
+  n2->print(oss2);
+  EXPECT_STREQ("{ } !{{ } !\"abc\", i8 0, { } !\"123\"}", oss1.str().c_str());
+  EXPECT_STREQ("{ } !{{ } !{{ } !\"abc\", i8 0, { } !\"123\"}}",
+               oss2.str().c_str());
+}
+}