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Added documentation and potentially sped things up a bit. I also commented a potential bug.

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This commit is contained in:
Blake Martin 2017-08-10 14:23:26 -05:00
parent 60c9f76478
commit a9591f3070
1 changed files with 30 additions and 16 deletions
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46
easy_profiler_core/profile_manager.h
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@ -223,13 +223,13 @@ public:
if (!need_expand(n))
{
int8_t* data = m_chunks.back().data + m_shift;
int8_t* data = &m_chunks.back().data[0] + m_shift;
m_shift += n + sizeof(uint16_t);
*(uint16_t*)data = n;
data = data + sizeof(uint16_t);
data += sizeof(uint16_t);
if (m_shift + 1 < N)
if (m_shift < N-1)
*(uint16_t*)(data + n) = 0;
return data;
@ -237,10 +237,10 @@ public:
m_shift = n + sizeof(uint16_t);
m_chunks.emplace_back();
auto data = m_chunks.back().data;
int8_t* data = m_chunks.back().data;
*(uint16_t*)data = n;
data = data + sizeof(uint16_t);
data += sizeof(uint16_t);
*(uint16_t*)(data + n) = 0;
return data;
@ -278,22 +278,36 @@ public:
void serialize(profiler::OStream& _outputStream)
{
// Chunks are stored in reversed order (stack).
// To be able to iterate them in direct order we have to invert chunks list.
// To be able to iterate them in direct order we have to invert the chunks list.
m_chunks.invert();
// Iterate over chunks and perform blocks serialization
auto current = m_chunks.last;
do {
// Each chunk is an array of N bytes that can hold between
// 1(if the list isn't empty) and however many elements can fit in a chunk,
// where an element consists of a payload size + a payload as follows:
// data[0..1]: size as a uint16_t
// data[2..?<(N-sizeof(uint16_t)-1): payload.
// Note: if elements don't completely fill a chunk:
// 1. If there is space for a uint16_t after the last element,
// a uint16_t of 0 is placed after it.
// 2. If there ISN'T space for a uint16_t after the last element,
// the last bytes contents are undefined.
chunk* current = m_chunks.last;
while (current != nullptr) {
const int8_t* data = current->data;
uint16_t i = 0;
while (i + 1 < N && *(uint16_t*)data != 0) {
const uint16_t size = sizeof(uint16_t) + *(uint16_t*)data;
_outputStream.write((const char*)data, size);
data = data + size;
i += size;
int_fast32_t chunkOffset = 0;
uint16_t payloadSize = *(uint16_t*)data;
// @Incomplete: doesn't handle the case where an element is one off from N-1!
while (chunkOffset < N-1 && payloadSize != 0) {
const uint16_t chunkSize = sizeof(uint16_t) + payloadSize;
_outputStream.write((const char*)data, chunkSize);
chunkOffset += (int16_t)chunkSize;
data += chunkSize;
payloadSize = *(uint16_t*)data;
}
current = current->prev;
} while (current != nullptr);
}
clear();
}