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llvm-mirror/unittests/CodeGen/DIEHashTest.cpp
Pavel Labath d33177a252 [DebugInfo] Reduce debug_str_offsets section size 
Summary:
The accelerator tables use the debug_str section to store their strings.
However, they do not support the indirect method of access that is
available for the debug_info section (DW_FORM_strx et al.).

Currently our code is assuming that all strings can/will be referenced
indirectly, and puts all of them into the debug_str_offsets section.
This is generally true for regular (unsplit) dwarf, but in the DWO case,
most of the strings in the debug_str section will only be used from the
accelerator tables. Therefore the contents of the debug_str_offsets
section will be largely unused and bloating the main executable.

This patch rectifies this by teaching the DwarfStringPool to
differentiate between strings accessed directly and indirectly. When a
user inserts a string into the pool it has to declare whether that
string will be referenced directly or not. If at least one user requsts
indirect access, that string will be assigned an index ID and put into
debug_str_offsets table. Otherwise, the offset table is skipped.

This approach reduces the overall binary size (when compiled with
-gdwarf-5 -gsplit-dwarf) in my tests by about 2% (debug_str_offsets is
shrunk by 99%).

Reviewers: probinson, dblaikie, JDevlieghere

Subscribers: aprantl, mgrang, llvm-commits

Differential Revision: https://reviews.llvm.org/D49493

llvm-svn: 339122
2018-08-07 09:54:52 +00:00

700 lines
26 KiB
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//===- llvm/unittest/CodeGen/DIEHashTest.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/DIEHash.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/CodeGen/DwarfStringPoolEntry.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// Test fixture
class DIEHashTest : public testing::Test {
public:
BumpPtrAllocator Alloc;
private:
StringMap<DwarfStringPoolEntry> Pool;
public:
DIEString getString(StringRef S) {
DwarfStringPoolEntry Entry = {nullptr, 1, 1};
return DIEString(DwarfStringPoolEntryRef(
*Pool.insert(std::make_pair(S, Entry)).first, Entry.isIndexed()));
}
};
TEST_F(DIEHashTest, Data1) {
DIEHash Hash;
DIE &Die = *DIE::get(Alloc, dwarf::DW_TAG_base_type);
DIEInteger Size(4);
Die.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Size);
uint64_t MD5Res = Hash.computeTypeSignature(Die);
ASSERT_EQ(0x1AFE116E83701108ULL, MD5Res);
}
// struct {};
TEST_F(DIEHashTest, TrivialType) {
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
// Line and file number are ignored.
Unnamed.addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
Unnamed.addValue(Alloc, 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_F(DIEHashTest, NamedType) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
Foo.addValue(Alloc, 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_F(DIEHashTest, NamespacedType) {
DIE &CU = *DIE::get(Alloc, dwarf::DW_TAG_compile_unit);
auto Space = DIE::get(Alloc, dwarf::DW_TAG_namespace);
DIEInteger One(1);
DIEString SpaceStr = getString("space");
Space->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, SpaceStr);
// DW_AT_declaration is ignored.
Space->addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
// sibling?
auto Foo = DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEString FooStr = getString("foo");
Foo->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
Foo->addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
DIE &N = *Foo;
Space->addChild(std::move(Foo));
CU.addChild(std::move(Space));
uint64_t MD5Res = DIEHash().computeTypeSignature(N);
// The exact same hash GCC produces for this DIE.
ASSERT_EQ(0x7b80381fd17f1e33ULL, MD5Res);
}
// struct { int member; };
TEST_F(DIEHashTest, TypeWithMember) {
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Four(4);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Four);
DIE &Int = *DIE::get(Alloc, dwarf::DW_TAG_base_type);
DIEString IntStr = getString("int");
Int.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, IntStr);
Int.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Four);
DIEInteger Five(5);
Int.addValue(Alloc, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, Five);
DIEEntry IntRef(Int);
auto Member = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemberStr = getString("member");
Member->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemberStr);
DIEInteger Zero(0);
Member->addValue(Alloc, dwarf::DW_AT_data_member_location,
dwarf::DW_FORM_data1, Zero);
Member->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IntRef);
Unnamed.addChild(std::move(Member));
uint64_t MD5Res = DIEHash().computeTypeSignature(Unnamed);
ASSERT_EQ(0x5646aa436b7e07c6ULL, MD5Res);
}
// struct foo { int mem1, mem2; };
TEST_F(DIEHashTest, ReusedType) {
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Eight(8);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEInteger Four(4);
DIE &Int = *DIE::get(Alloc, dwarf::DW_TAG_base_type);
DIEString IntStr = getString("int");
Int.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, IntStr);
Int.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Four);
DIEInteger Five(5);
Int.addValue(Alloc, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, Five);
DIEEntry IntRef(Int);
auto Mem1 = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString Mem1Str = getString("mem1");
Mem1->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, Mem1Str);
DIEInteger Zero(0);
Mem1->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
Mem1->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IntRef);
Unnamed.addChild(std::move(Mem1));
auto Mem2 = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString Mem2Str = getString("mem2");
Mem2->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, Mem2Str);
Mem2->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Four);
Mem2->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IntRef);
Unnamed.addChild(std::move(Mem2));
uint64_t MD5Res = DIEHash().computeTypeSignature(Unnamed);
ASSERT_EQ(0x3a7dc3ed7b76b2f8ULL, MD5Res);
}
// struct foo { static foo f; };
TEST_F(DIEHashTest, RecursiveType) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemStr = getString("mem");
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
DIEEntry FooRef(Foo);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooRef);
// DW_AT_external and DW_AT_declaration are ignored anyway, so skip them.
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0x73d8b25aef227b06ULL, MD5Res);
}
// struct foo { foo *mem; };
TEST_F(DIEHashTest, Pointer) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Eight(8);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemStr = getString("mem");
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
DIEInteger Zero(0);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
DIE &FooPtr = *DIE::get(Alloc, dwarf::DW_TAG_pointer_type);
FooPtr.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEEntry FooRef(Foo);
FooPtr.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooRef);
DIEEntry FooPtrRef(FooPtr);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooPtrRef);
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0x74ea73862e8708d2ULL, MD5Res);
}
// struct foo { foo &mem; };
TEST_F(DIEHashTest, Reference) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Eight(8);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemStr = getString("mem");
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
DIEInteger Zero(0);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
DIE &FooRef = *DIE::get(Alloc, dwarf::DW_TAG_reference_type);
FooRef.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEEntry FooEntry(Foo);
FooRef.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooEntry);
DIE &FooRefConst = *DIE::get(Alloc, dwarf::DW_TAG_const_type);
DIEEntry FooRefRef(FooRef);
FooRefConst.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
FooRefRef);
DIEEntry FooRefConstRef(FooRefConst);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooRefConstRef);
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0xa0b15f467ad4525bULL, MD5Res);
}
// struct foo { foo &&mem; };
TEST_F(DIEHashTest, RValueReference) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Eight(8);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemStr = getString("mem");
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
DIEInteger Zero(0);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
DIE &FooRef = *DIE::get(Alloc, dwarf::DW_TAG_rvalue_reference_type);
FooRef.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEEntry FooEntry(Foo);
FooRef.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooEntry);
DIE &FooRefConst = *DIE::get(Alloc, dwarf::DW_TAG_const_type);
DIEEntry FooRefRef(FooRef);
FooRefConst.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
FooRefRef);
DIEEntry FooRefConstRef(FooRefConst);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooRefConstRef);
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0xad211c8c3b31e57ULL, MD5Res);
}
// struct foo { foo foo::*mem; };
TEST_F(DIEHashTest, PtrToMember) {
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger Eight(8);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
DIEString FooStr = getString("foo");
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString MemStr = getString("mem");
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
DIEInteger Zero(0);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
DIE &PtrToFooMem = *DIE::get(Alloc, dwarf::DW_TAG_ptr_to_member_type);
DIEEntry FooEntry(Foo);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FooEntry);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
FooEntry);
DIEEntry PtrToFooMemRef(PtrToFooMem);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, PtrToFooMemRef);
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0x852e0c9ff7c04ebULL, MD5Res);
}
// Check that the hash for a pointer-to-member matches regardless of whether the
// pointed-to type is a declaration or a definition.
//
// struct bar; // { };
// struct foo { bar foo::*mem; };
TEST_F(DIEHashTest, PtrToMemberDeclDefMatch) {
DIEInteger Zero(0);
DIEInteger One(1);
DIEInteger Eight(8);
DIEString FooStr = getString("foo");
DIEString BarStr = getString("bar");
DIEString MemStr = getString("mem");
uint64_t MD5ResDecl;
{
DIE &Bar = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Bar.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, BarStr);
Bar.addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location,
dwarf::DW_FORM_data1, Zero);
DIE &PtrToFooMem = *DIE::get(Alloc, dwarf::DW_TAG_ptr_to_member_type);
DIEEntry BarEntry(Bar);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
BarEntry);
DIEEntry FooEntry(Foo);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_containing_type,
dwarf::DW_FORM_ref4, FooEntry);
DIEEntry PtrToFooMemRef(PtrToFooMem);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
PtrToFooMemRef);
Foo.addChild(std::move(Mem));
MD5ResDecl = DIEHash().computeTypeSignature(Foo);
}
uint64_t MD5ResDef;
{
DIE &Bar = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Bar.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, BarStr);
Bar.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location,
dwarf::DW_FORM_data1, Zero);
DIE &PtrToFooMem = *DIE::get(Alloc, dwarf::DW_TAG_ptr_to_member_type);
DIEEntry BarEntry(Bar);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
BarEntry);
DIEEntry FooEntry(Foo);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_containing_type,
dwarf::DW_FORM_ref4, FooEntry);
DIEEntry PtrToFooMemRef(PtrToFooMem);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
PtrToFooMemRef);
Foo.addChild(std::move(Mem));
MD5ResDef = DIEHash().computeTypeSignature(Foo);
}
ASSERT_EQ(MD5ResDef, MD5ResDecl);
}
// Check that the hash for a pointer-to-member matches regardless of whether the
// pointed-to type is a declaration or a definition.
//
// struct bar; // { };
// struct foo { bar bar::*mem; };
TEST_F(DIEHashTest, PtrToMemberDeclDefMisMatch) {
DIEInteger Zero(0);
DIEInteger One(1);
DIEInteger Eight(8);
DIEString FooStr = getString("foo");
DIEString BarStr = getString("bar");
DIEString MemStr = getString("mem");
uint64_t MD5ResDecl;
{
DIE &Bar = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Bar.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, BarStr);
Bar.addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location,
dwarf::DW_FORM_data1, Zero);
DIE &PtrToFooMem = *DIE::get(Alloc, dwarf::DW_TAG_ptr_to_member_type);
DIEEntry BarEntry(Bar);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
BarEntry);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_containing_type,
dwarf::DW_FORM_ref4, BarEntry);
DIEEntry PtrToFooMemRef(PtrToFooMem);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
PtrToFooMemRef);
Foo.addChild(std::move(Mem));
MD5ResDecl = DIEHash().computeTypeSignature(Foo);
}
uint64_t MD5ResDef;
{
DIE &Bar = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Bar.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, BarStr);
Bar.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location,
dwarf::DW_FORM_data1, Zero);
DIE &PtrToFooMem = *DIE::get(Alloc, dwarf::DW_TAG_ptr_to_member_type);
DIEEntry BarEntry(Bar);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
BarEntry);
PtrToFooMem.addValue(Alloc, dwarf::DW_AT_containing_type,
dwarf::DW_FORM_ref4, BarEntry);
DIEEntry PtrToFooMemRef(PtrToFooMem);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
PtrToFooMemRef);
Foo.addChild(std::move(Mem));
MD5ResDef = DIEHash().computeTypeSignature(Foo);
}
// FIXME: This seems to be a bug in the DWARF type hashing specification that
// only uses the brief name hashing for types referenced via DW_AT_type. In
// this case the type is referenced via DW_AT_containing_type and full hashing
// causes a hash to differ when the containing type is a declaration in one TU
// and a definition in another.
ASSERT_NE(MD5ResDef, MD5ResDecl);
}
// struct { } a;
// struct foo { decltype(a) mem; };
TEST_F(DIEHashTest, RefUnnamedType) {
DIEInteger Zero(0);
DIEInteger One(1);
DIEInteger Eight(8);
DIEString FooStr = getString("foo");
DIEString MemStr = getString("mem");
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
DIE &Foo = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
Foo.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Eight);
Foo.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
auto Mem = DIE::get(Alloc, dwarf::DW_TAG_member);
Mem->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, MemStr);
Mem->addValue(Alloc, dwarf::DW_AT_data_member_location, dwarf::DW_FORM_data1,
Zero);
DIE &UnnamedPtr = *DIE::get(Alloc, dwarf::DW_TAG_pointer_type);
UnnamedPtr.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1,
Eight);
DIEEntry UnnamedRef(Unnamed);
UnnamedPtr.addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4,
UnnamedRef);
DIEEntry UnnamedPtrRef(UnnamedPtr);
Mem->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, UnnamedPtrRef);
Foo.addChild(std::move(Mem));
uint64_t MD5Res = DIEHash().computeTypeSignature(Foo);
ASSERT_EQ(0x954e026f01c02529ULL, MD5Res);
}
// struct { struct foo { }; };
TEST_F(DIEHashTest, NestedType) {
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
auto Foo = DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEString FooStr = getString("foo");
Foo->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FooStr);
Foo->addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
Unnamed.addChild(std::move(Foo));
uint64_t MD5Res = DIEHash().computeTypeSignature(Unnamed);
// The exact same hash GCC produces for this DIE.
ASSERT_EQ(0xde8a3b7b43807f4aULL, MD5Res);
}
// struct { static void func(); };
TEST_F(DIEHashTest, MemberFunc) {
DIE &Unnamed = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
Unnamed.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
auto Func = DIE::get(Alloc, dwarf::DW_TAG_subprogram);
DIEString FuncStr = getString("func");
Func->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FuncStr);
Unnamed.addChild(std::move(Func));
uint64_t MD5Res = DIEHash().computeTypeSignature(Unnamed);
// The exact same hash GCC produces for this DIE.
ASSERT_EQ(0xd36a1b6dfb604ba0ULL, MD5Res);
}
// struct A {
// static void func();
// };
TEST_F(DIEHashTest, MemberFuncFlag) {
DIE &A = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
DIEString AStr = getString("A");
A.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, AStr);
A.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, One);
auto Func = DIE::get(Alloc, dwarf::DW_TAG_subprogram);
DIEString FuncStr = getString("func");
DIEString FuncLinkage = getString("_ZN1A4funcEv");
DIEInteger Two(2);
Func->addValue(Alloc, dwarf::DW_AT_external, dwarf::DW_FORM_flag_present,
One);
Func->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FuncStr);
Func->addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
Func->addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, Two);
Func->addValue(Alloc, dwarf::DW_AT_linkage_name, dwarf::DW_FORM_strp,
FuncLinkage);
Func->addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
A.addChild(std::move(Func));
uint64_t MD5Res = DIEHash().computeTypeSignature(A);
// The exact same hash GCC produces for this DIE.
ASSERT_EQ(0x8f78211ddce3df10ULL, MD5Res);
}
// Derived from:
// struct A {
// const static int PI = -3;
// };
// A a;
TEST_F(DIEHashTest, MemberSdata) {
DIE &A = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
DIEString AStr = getString("A");
A.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, AStr);
A.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, One);
DIEInteger Four(4);
DIEInteger Five(5);
DIEString FStr = getString("int");
DIE &IntTyDIE = *DIE::get(Alloc, dwarf::DW_TAG_base_type);
IntTyDIE.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, Four);
IntTyDIE.addValue(Alloc, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, Five);
IntTyDIE.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FStr);
DIEEntry IntTy(IntTyDIE);
auto PITyDIE = DIE::get(Alloc, dwarf::DW_TAG_const_type);
PITyDIE->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IntTy);
DIEEntry PITy(*PITyDIE);
auto PI = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString PIStr = getString("PI");
DIEInteger Two(2);
DIEInteger NegThree(-3);
PI->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, PIStr);
PI->addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
PI->addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, Two);
PI->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, PITy);
PI->addValue(Alloc, dwarf::DW_AT_external, dwarf::DW_FORM_flag_present, One);
PI->addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
PI->addValue(Alloc, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, NegThree);
A.addChild(std::move(PI));
uint64_t MD5Res = DIEHash().computeTypeSignature(A);
ASSERT_EQ(0x9a216000dd3788a7ULL, MD5Res);
}
// Derived from:
// struct A {
// const static float PI = 3.14;
// };
// A a;
TEST_F(DIEHashTest, MemberBlock) {
DIE &A = *DIE::get(Alloc, dwarf::DW_TAG_structure_type);
DIEInteger One(1);
DIEString AStr = getString("A");
A.addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, AStr);
A.addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
A.addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, One);
DIEInteger Four(4);
DIEString FStr = getString("float");
auto FloatTyDIE = DIE::get(Alloc, dwarf::DW_TAG_base_type);
FloatTyDIE->addValue(Alloc, dwarf::DW_AT_byte_size, dwarf::DW_FORM_data1,
Four);
FloatTyDIE->addValue(Alloc, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
Four);
FloatTyDIE->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, FStr);
DIEEntry FloatTy(*FloatTyDIE);
auto PITyDIE = DIE::get(Alloc, dwarf::DW_TAG_const_type);
PITyDIE->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, FloatTy);
DIEEntry PITy(*PITyDIE);
auto PI = DIE::get(Alloc, dwarf::DW_TAG_member);
DIEString PIStr = getString("PI");
DIEInteger Two(2);
PI->addValue(Alloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp, PIStr);
PI->addValue(Alloc, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data1, One);
PI->addValue(Alloc, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data1, Two);
PI->addValue(Alloc, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, PITy);
PI->addValue(Alloc, dwarf::DW_AT_external, dwarf::DW_FORM_flag_present, One);
PI->addValue(Alloc, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag_present,
One);
DIEBlock PIBlock;
DIEInteger Blk1(0xc3);
DIEInteger Blk2(0xf5);
DIEInteger Blk3(0x48);
DIEInteger Blk4(0x40);
PIBlock.addValue(Alloc, (dwarf::Attribute)0, dwarf::DW_FORM_data1, Blk1);
PIBlock.addValue(Alloc, (dwarf::Attribute)0, dwarf::DW_FORM_data1, Blk2);
PIBlock.addValue(Alloc, (dwarf::Attribute)0, dwarf::DW_FORM_data1, Blk3);
PIBlock.addValue(Alloc, (dwarf::Attribute)0, dwarf::DW_FORM_data1, Blk4);
PI->addValue(Alloc, dwarf::DW_AT_const_value, dwarf::DW_FORM_block1,
&PIBlock);
A.addChild(std::move(PI));
uint64_t MD5Res = DIEHash().computeTypeSignature(A);
ASSERT_EQ(0x493af53ad3d3f651ULL, MD5Res);
}
}
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