Support multiple primary functions in a single snapshot. (#1797)

This patch adds an extension to snapshots which allows storing
multiple position independent primary functions in a single
snapshot data. A new application called jerry-snapshot is
added to the project to manage snapshots. Currently the only
option is merging snapshots.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/CMakeLists.txt

@@ -50,6 +50,12 @@ if(NOT FEATURE_JS_PARSER)
   set(FEATURE_PARSER_DUMP_MESSAGE   " (FORCED BY DISABLED JS PARSER)")
 endif()
 
+if(JERRY_CMDLINE_SNAPSHOT)
+  set(FEATURE_SNAPSHOT_SAVE ON)
+
+  set(FEATURE_SNAPSHOT_SAVE_MESSAGE " (FORCED BY SNAPSHOT TOOL)")
+endif()
+
 # Status messages
 message(STATUS "FEATURE_CPOINTER_32_BIT   " ${FEATURE_CPOINTER_32_BIT} ${FEATURE_CPOINTER_32_BIT_MESSAGE})
 message(STATUS "FEATURE_DEBUGGER          " ${FEATURE_DEBUGGER})
@@ -62,7 +68,7 @@ message(STATUS "FEATURE_PARSER_DUMP       " ${FEATURE_PARSER_DUMP} ${FEATURE_PAR
 message(STATUS "FEATURE_PROFILE           " ${FEATURE_PROFILE})
 message(STATUS "FEATURE_REGEXP_DUMP       " ${FEATURE_REGEXP_DUMP})
 message(STATUS "FEATURE_SNAPSHOT_EXEC     " ${FEATURE_SNAPSHOT_EXEC} ${FEATURE_SNAPSHOT_EXEC_MESSAGE})
-message(STATUS "FEATURE_SNAPSHOT_SAVE     " ${FEATURE_SNAPSHOT_SAVE})
+message(STATUS "FEATURE_SNAPSHOT_SAVE     " ${FEATURE_SNAPSHOT_SAVE} ${FEATURE_SNAPSHOT_SAVE_MESSAGE})
 message(STATUS "FEATURE_SYSTEM_ALLOCATOR  " ${FEATURE_SYSTEM_ALLOCATOR})
 message(STATUS "FEATURE_VALGRIND          " ${FEATURE_VALGRIND})
 message(STATUS "FEATURE_VALGRIND_FREYA    " ${FEATURE_VALGRIND_FREYA})