[Local GC] Implement loader protocol for a standalone GC (#14663)

* First cut of the load protocol

* Implement for non-standalone GC

* Initial working implementation

* First steps towards not using GetProcAddress when not using a standalone GC

* Factor out loading routines into standalone and non-standalone cases

* Remove the FEATURE_STANDALONE_GC_ONLY build

* Code cleanup and comments

* Comments for the version numbers

* Use more appropriate type for config string

* add GC_LOAD_STATUS_BEFORE_START to disambiguate failures before the start of the load and failures at the beginning of the load

* FEATURE_STANDALONE_GC on by default

* Implement YieldProcessor and MemoryBarrier for arm and arm64

* Remove missed FEATURE_STANDALONE_GC feature check

1 files changed, 7 insertions, 21 deletions

diff --git a/src/vm/CMakeLists.txt b/src/vm/CMakeLists.txt
index 0aed676d94..8b9219dee3 100644
--- a/src/vm/CMakeLists.txt
+++ b/src/vm/CMakeLists.txt
@@ -10,15 +10,11 @@ add_definitions(-D_UNICODE)
 
 if(CMAKE_CONFIGURATION_TYPES) # multi-configuration generator?
   foreach (Config DEBUG CHECKED)  
-    if(NOT FEATURE_STANDALONE_GC_ONLY)
-      set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS $<$<CONFIG:${Config}>:WRITE_BARRIER_CHECK=1>)
-    endif(NOT FEATURE_STANDALONE_GC_ONLY)
+    set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS $<$<CONFIG:${Config}>:WRITE_BARRIER_CHECK=1>)
   endforeach (Config)
 else()
   if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL DEBUG OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL CHECKED)
-    if(NOT FEATURE_STANDALONE_GC_ONLY)
-      add_definitions(-DWRITE_BARRIER_CHECK=1)
-    endif(NOT FEATURE_STANDALONE_GC_ONLY)
+    add_definitions(-DWRITE_BARRIER_CHECK=1)
   endif(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL DEBUG OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL CHECKED)
 endif(CMAKE_CONFIGURATION_TYPES)
 
@@ -200,6 +196,7 @@ set(VM_SOURCES_WKS
     gccover.cpp
     gcenv.ee.static.cpp
     gcenv.ee.common.cpp
+    gcenv.os.cpp
     gchelpers.cpp
     genmeth.cpp
     hosting.cpp
@@ -270,6 +267,7 @@ set(GC_SOURCES_WKS
     ../gc/gchandletable.cpp
     ../gc/gceesvr.cpp
     ../gc/gceewks.cpp
+    ../gc/gcload.cpp
     ../gc/softwarewritewatch.cpp
     ../gc/handletablecache.cpp)
 
@@ -285,12 +283,6 @@ if(FEATURE_STANDALONE_GC)
         )
 endif(FEATURE_STANDALONE_GC)
 
-if(NOT FEATURE_STANDALONE_GC)
-    list(APPEND VM_SOURCES_WKS
-        gcenv.os.cpp
-        )
-endif(NOT FEATURE_STANDALONE_GC)
-
 if(WIN32)
 
 set(VM_SOURCES_DAC_AND_WKS_WIN32
@@ -511,15 +503,9 @@ list(APPEND VM_SOURCES_DAC
     ${VM_SOURCES_DAC_AND_WKS_ARCH}
 )
 
-# The default option for FEATURE_STANDALONE_GC builds a standalone
-# and non-standalone GC, linking the non-standalone GC into coreclr.dll.
-# For testing purposes, FEATURE_STANDALONE_GC_ONLY instead only builds and
-# links the non-standalone GC into coreclr.dll.
-if (NOT FEATURE_STANDALONE_GC_ONLY)
-    list(APPEND VM_SOURCES_WKS
-        ${GC_SOURCES_WKS}
-    )
-endif(NOT FEATURE_STANDALONE_GC_ONLY)
+list(APPEND VM_SOURCES_WKS
+     ${GC_SOURCES_WKS}
+)
 
 # The DAC does need GC sources in order to link correctly, even if
 # it's not used.