llvm/unittests/Analysis/GraphWriterTest.cpp

   1 //===- GraphWriterTest.cpp - GraphWriter unit tests -----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/GraphWriter.h"
  10 #include "llvm/Analysis/CFGPrinter.h"
  11 #include "llvm/AsmParser/Parser.h"
  12 #include "llvm/IR/Function.h"
  13 #include "llvm/IR/LLVMContext.h"
  14 #include "llvm/IR/Module.h"
  15 #include "llvm/Testing/Support/SupportHelpers.h"
  16 #include "llvm/Support/SourceMgr.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include "gtest/gtest.h"
  19 #include <string>
  20
  21 #define ASSERT_NO_ERROR(x)                                                     \
  22   if (std::error_code ASSERT_NO_ERROR_ec = x) {                                \
  23     SmallString<128> MessageStorage;                                           \
  24     raw_svector_ostream Message(MessageStorage);                               \
  25     Message << #x ": did not return errc::success.\n"                          \
  26             << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"          \
  27             << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n";      \
  28     GTEST_FATAL_FAILURE_(MessageStorage.c_str());                              \
  29   } else {                                                                     \
  30   }
  31
  32 namespace llvm {
  33 namespace {
  34
  35 class GraphWriterTest : public testing::Test {
  36 protected:
  37   LLVMContext C;
  38
  39   std::unique_ptr<Module> makeLLVMModule() {
  40     const char *ModuleStrig = "define i32 @f(i32 %x) {\n"
  41                               "bb0:\n"
  42                               "  %y1 = icmp eq i32 %x, 0 \n"
  43                               "  br i1 %y1, label %bb1, label %bb2 \n"
  44                               "bb1:\n"
  45                               "  br label %bb3\n"
  46                               "bb2:\n"
  47                               "  br label %bb3\n"
  48                               "bb3:\n"
  49                               "  %y2 = phi i32 [0, %bb1], [1, %bb2] \n"
  50                               "  ret i32 %y2\n"
  51                               "}\n";
  52     SMDiagnostic Err;
  53     return parseAssemblyString(ModuleStrig, Err, C);
  54   }
  55 };
  56
  57 static void writeCFGToDotFile(Function &F, std::string Name,
  58                               bool CFGOnly = false) {
  59   std::error_code EC;
  60   llvm::unittest::TempDir Tmp("tmpdir", /*Unique=*/true);
  61   SmallString<128> FileName(Tmp.path().begin(), Tmp.path().end());
  62   sys::path::append(FileName, Name + ".dot");
  63   raw_fd_ostream File(FileName, EC, sys::fs::OpenFlags::OF_Text);
  64
  65   DOTFuncInfo CFGInfo(&F);
  66
  67   ASSERT_NO_ERROR(EC);
  68   // Test intentionally does not pass BPI, WriteGraph should work without it.
  69   WriteGraph(File, &CFGInfo, CFGOnly);
  70 }
  71
  72 TEST_F(GraphWriterTest, WriteCFGDotFileTest) {
  73   auto M = makeLLVMModule();
  74   Function *F = M->getFunction("f");
  75
  76   writeCFGToDotFile(*F, "test-full");
  77   writeCFGToDotFile(*F, "test-cfg-only", true);
  78 }
  79
  80 } // end anonymous namespace
  81 } // end namespace llvm