Feature/capture (#4397)

* Add the function tailer for appending the output

- The basic format for the capture encode is as follow:

Header:
4 bytes: magic number ('H' 'E' 'A' 'D' )
4 bytes: call id - specify the method name
8 bytes: handle id - specify 'this' pointer
8 bytes: payload size in bytes - specify the data size of parameters
8 bytes: thread id

Payload:
Encode for all the parameters.

Tailer (optional):
Tailer is an optional, it only used when the output of the method is
also stored in the method. Usually it just the opaque handle allocated
by slang.

4 bytes: magic number ('T' 'A' 'I' 'L')
4 bytes: payload size in bytes.

- Fix some issues in checking the result of write of output stream.

* Encoding methods of IGlobalSession

Add encoding logic for all the member functions of IGlobalSession,
except those query functions that do not impact the internal state
of slang.

Because some get functions will invoke allocations by slang, these
functions are account for the "query functions". Therefore those
functions are still captured.

All the allocations are stored by using their address, because those
allocations are opaque and will finally be used as inputs for other
APIs, there is no need to store the data. We just need to track
those address and know which APIs will consume them.

* Add SLANG_CAPTURE_CHECK macro

Add SLANG_CAPTURE_CHECK macro to check SLANG_OK is returned.

* Fix build error

1 files changed, 1 insertions, 1 deletions

diff --git a/source/core/slang-stream.h b/source/core/slang-stream.h
index a62c18838..8459d53d1 100644
--- a/source/core/slang-stream.h
+++ b/source/core/slang-stream.h
@@ -138,7 +138,7 @@ public:
     void setContent(const void* contents, size_t contentsSize)
     {
         m_ownedContents.setCount(contentsSize);
-        if (contentsSize > 0)
+        if (contents != nullptr)
         {
             ::memcpy(m_ownedContents.getBuffer(), contents, contentsSize);
         }