unittests/CodeGen/DIEHashTest.cpp

//===- llvm/unittest/DebugInfo/DWARFFormValueTest.cpp ---------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "../lib/CodeGen/AsmPrinter/DIE.h"
#include "../lib/CodeGen/AsmPrinter/DIEHash.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "gtest/gtest.h"

using namespace llvm;

namespace {
TEST(DIEHashTest, Data1) {
  DIEHash Hash;
  DIE Die(dwarf::DW_TAG_base_type);
  DIEInteger Size(4);
  Die.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Size);
  uint64_t MD5Res = Hash.computeTypeSignature(&Die);
  ASSERT_EQ(0x1AFE116E83701108ULL, MD5Res);
}

// struct {};
TEST(DIEHashTest, TrivialType) {
  DIE Unnamed(dwarf::DW_TAG_structure_type);
  DIEInteger One(1);
  Unnamed.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &One);

  // Line and file number are ignored.
  Unnamed.addValue(dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, &One);
  Unnamed.addValue(dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, &One);
  uint64_t MD5Res = DIEHash().computeTypeSignature(&Unnamed);

  // The exact same hash GCC produces for this DIE.
  ASSERT_EQ(0x715305ce6cfd9ad1ULL, MD5Res);
}

// struct foo { };
TEST(DIEHashTest, NamedType) {
  DIE Foo(dwarf::DW_TAG_structure_type);
  DIEInteger One(1);
  DIEString FooStr(&One, "foo");
  Foo.addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &FooStr);
  Foo.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &One);

  uint64_t MD5Res = DIEHash().computeTypeSignature(&Foo);

  // The exact same hash GCC produces for this DIE.
  ASSERT_EQ(0xd566dbd2ca5265ffULL, MD5Res);
}

// namespace space { struct foo { }; }
TEST(DIEHashTest, NamespacedType) {
  DIE CU(dwarf::DW_TAG_compile_unit);

  DIE *Space = new DIE(dwarf::DW_TAG_namespace);
  DIEInteger One(1);
  DIEString SpaceStr(&One, "space");
  Space->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &SpaceStr);
  // DW_AT_declaration is ignored.
  Space->addValue(dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present, &One);
  // sibling?

  DIE *Foo = new DIE(dwarf::DW_TAG_structure_type);
  DIEString FooStr(&One, "foo");
  Foo->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &FooStr);
  Foo->addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &One);

  Space->addChild(Foo);
  CU.addChild(Space);

  uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);

  // The exact same hash GCC produces for this DIE.
  ASSERT_EQ(0x7b80381fd17f1e33ULL, MD5Res);
}

// struct { int member; };
TEST(DIEHashTest, TypeWithMember) {
  DIE Unnamed(dwarf::DW_TAG_structure_type);
  DIEInteger Four(4);
  Unnamed.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Four);

  DIE *Member = new DIE(dwarf::DW_TAG_member);
  DIEString MemberStr(&Four, "member");
  Member->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &MemberStr);
  DIEInteger Zero(0);
  Member->addValue(dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1, &Zero);

  Unnamed.addChild(Member);

  DIE Int(dwarf::DW_TAG_base_type);
  DIEString IntStr(&Four, "int");
  Int.addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &IntStr);
  Int.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Four);
  DIEInteger Five(5);
  Int.addValue(dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, &Five);

  DIEEntry IntRef(&Int);
  Member->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &IntRef);

  uint64_t MD5Res = DIEHash().computeTypeSignature(&Unnamed);

  ASSERT_EQ(0x5646aa436b7e07c6ULL, MD5Res);
}

// struct foo { int mem1, mem2; };
TEST(DIEHashTest, ReusedType) {
  DIE Unnamed(dwarf::DW_TAG_structure_type);
  DIEInteger Eight(8);
  Unnamed.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Eight);

  DIE *Mem1 = new DIE(dwarf::DW_TAG_member);
  DIEInteger Four(4);
  DIEString Mem1Str(&Four, "mem1");
  Mem1->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &Mem1Str);
  DIEInteger Zero(0);
  Mem1->addValue(dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1, &Zero);

  Unnamed.addChild(Mem1);

  DIE *Mem2 = new DIE(dwarf::DW_TAG_member);
  DIEString Mem2Str(&Four, "mem2");
  Mem2->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &Mem2Str);
  Mem2->addValue(dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1, &Four);

  Unnamed.addChild(Mem2);

  DIE Int(dwarf::DW_TAG_base_type);
  DIEString IntStr(&Four, "int");
  Int.addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &IntStr);
  Int.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Four);
  DIEInteger Five(5);
  Int.addValue(dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, &Five);

  DIEEntry IntRef(&Int);
  Mem1->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &IntRef);
  Mem2->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &IntRef);

  uint64_t MD5Res = DIEHash().computeTypeSignature(&Unnamed);

  ASSERT_EQ(0x3a7dc3ed7b76b2f8ULL, MD5Res);
}

// struct foo { static foo f; };
TEST(DIEHashTest, RecursiveType) {
  DIE Foo(dwarf::DW_TAG_structure_type);
  DIEInteger One(1);
  Foo.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &One);
  DIEString FooStr(&One, "foo");
  Foo.addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &FooStr);

  DIE *Mem = new DIE(dwarf::DW_TAG_member);
  DIEString MemStr(&One, "mem");
  Mem->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &MemStr);
  DIEEntry FooRef(&Foo);
  Mem->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &FooRef);
  // DW_AT_external and DW_AT_declaration are ignored anyway, so skip them.

  Foo.addChild(Mem);

  uint64_t MD5Res = DIEHash().computeTypeSignature(&Foo);

  ASSERT_EQ(0x73d8b25aef227b06ULL, MD5Res);
}

// struct foo { foo *mem; };
TEST(DIEHashTest, Pointer) {
  DIE Foo(dwarf::DW_TAG_structure_type);
  DIEInteger Eight(8);
  Foo.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Eight);
  DIEString FooStr(&Eight, "foo");
  Foo.addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &FooStr);

  DIE *Mem = new DIE(dwarf::DW_TAG_member);
  DIEString MemStr(&Eight, "mem");
  Mem->addValue(dwarf::DW_AT_name, dwarf::DW_FORM_strp, &MemStr);
  DIEInteger Zero(0);
  Mem->addValue(dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1, &Zero);

  DIE FooPtr(dwarf::DW_TAG_pointer_type);
  FooPtr.addValue(dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, &Eight);
  DIEEntry FooRef(&Foo);
  FooPtr.addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &FooRef);

  DIEEntry FooPtrRef(&FooPtr);
  Mem->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, &FooPtrRef);

  Foo.addChild(Mem);

  uint64_t MD5Res = DIEHash().computeTypeSignature(&Foo);

  ASSERT_EQ(0x74ea73862e8708d2ULL, MD5Res);
}
}