Dump global names

[rkr35]

Requires #1

[rkr35]

void DebugDump(TArray<const FNameEntry*>& Out) const
{
    FRWScopeLock _(Lock, FRWScopeLockType::SLT_ReadOnly);

    for (uint32 BlockIdx = 0; BlockIdx < CurrentBlock; ++BlockIdx)
    {
        DebugDumpBlock(Blocks[BlockIdx], BlockSizeBytes, Out);
    }

    DebugDumpBlock(Blocks[CurrentBlock], CurrentByteCursor, Out);
}

static void DebugDumpBlock(const uint8* It, uint32 BlockSize, TArray<const FNameEntry*>& Out)
{
    const uint8* End = It + BlockSize - FNameEntry::GetDataOffset();
    while (It < End)
    {
        const FNameEntry* Entry = (const FNameEntry*)It;
        if (uint32 Len = Entry->Header.Len)
        {
            Out.Add(Entry);
            It += FNameEntry::GetSize(Len, !Entry->IsWide());
        }
        else // Null-terminator entry found
        {
            break;
        }
    }
}

[rkr35]

enum { Stride = alignof(FNameEntry) };
enum { BlockSizeBytes = Stride * FNameBlockOffsets };

uint8* Blocks[FNameMaxBlocks] = {};

FNameEntry& Resolve(FNameEntryHandle Handle) const
{
    // Lock not needed
    return *reinterpret_cast<FNameEntry*>(Blocks[Handle.Block] + Stride * Handle.Offset);
}

[rkr35]

/** Remember to update natvis if you change these */
enum { FNameMaxBlockBits = 13 }; // Limit block array a bit, still allowing 8k * block size = 1GB - 2G of FName entry data
enum { FNameBlockOffsetBits = 16 };
enum { FNameMaxBlocks = 1 << FNameMaxBlockBits };
enum { FNameBlockOffsets = 1 << FNameBlockOffsetBits };

/** An unpacked FNameEntryId */
struct FNameEntryHandle
{
	uint32 Block = 0;
	uint32 Offset = 0;

	FNameEntryHandle(uint32 InBlock, uint32 InOffset)
		: Block(InBlock)
		, Offset(InOffset)
	{}

	FNameEntryHandle(FNameEntryId Id)
		: Block(Id.ToUnstableInt() >> FNameBlockOffsetBits)
		, Offset(Id.ToUnstableInt() & (FNameBlockOffsets - 1))
	{}

	operator FNameEntryId() const
	{
		return FNameEntryId::FromUnstableInt(Block << FNameBlockOffsetBits | Offset);
	}

	explicit operator bool() const { return Block | Offset; }
};

[rkr35]

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