unittests/IR/AsmWriterTest.cpp

   1 //===- llvm/unittest/IR/AsmWriter.cpp - AsmWriter tests -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 #include "llvm/BinaryFormat/Dwarf.h"
  10 #include "llvm/IR/DebugInfoMetadata.h"
  11 #include "llvm/IR/Function.h"
  12 #include "llvm/IR/IRBuilder.h"
  13 #include "llvm/IR/LLVMContext.h"
  14 #include "llvm/IR/MDBuilder.h"
  15 #include "llvm/IR/Module.h"
  16 #include "gtest/gtest.h"
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 TEST(AsmWriterTest, DebugPrintDetachedInstruction) {
  23
  24   // PR24852: Ensure that an instruction can be printed even when it
  25   // has metadata attached but no parent.
  26   LLVMContext Ctx;
  27   auto Ty = Type::getInt32Ty(Ctx);
  28   auto Undef = UndefValue::get(Ty);
  29   std::unique_ptr<BinaryOperator> Add(BinaryOperator::CreateAdd(Undef, Undef));
  30   Add->setMetadata(
  31       "", MDNode::get(Ctx, {ConstantAsMetadata::get(ConstantInt::get(Ty, 1))}));
  32   std::string S;
  33   raw_string_ostream OS(S);
  34   Add->print(OS);
  35   std::size_t r = OS.str().find("<badref> = add i32 undef, undef, !<empty");
  36   EXPECT_TRUE(r != std::string::npos);
  37 }
  38
  39 TEST(AsmWriterTest, DumpDIExpression) {
  40   LLVMContext Ctx;
  41   uint64_t Ops[] = {
  42     dwarf::DW_OP_constu, 4,
  43     dwarf::DW_OP_minus,
  44     dwarf::DW_OP_deref,
  45   };
  46   DIExpression *Expr = DIExpression::get(Ctx, Ops);
  47   std::string S;
  48   raw_string_ostream OS(S);
  49   Expr->print(OS);
  50   EXPECT_EQ("!DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref)",
  51             OS.str());
  52 }
  53
  54 }