Remove support for using jemalloc instead of the system allocator

There was never any investigation done to determine whether using
jemalloc was actually a net benefit for nvim.  It has been a portability
limitation and adds another factor to consider when triaging issues.

src/coverity-model.c

@@ -34,32 +34,6 @@ int uv_pipe_open(struct uv_pipe_s *handle, int fd)
   return result;
 }
 
-// Issue 2422
-//
-// Teach coverity about jemalloc functions, so that it understands
-// they are equivalent to malloc ones.
-
-void *je_malloc(size_t size)
-{
-  return __coverity_alloc__(size);
-}
-
-void je_free(void *ptr)
-{
-  __coverity_free__(ptr);
-}
-
-void *je_calloc(size_t count, size_t size)
-{
-  return je_malloc(count * size);
-}
-
-void *je_realloc(void *ptr, size_t size)
-{
-  je_free(ptr);
-  return je_malloc(size);
-}
-
 // Hint Coverity that adding item to d avoids losing track
 // of the memory allocated for item.
 typedef struct {} dictitem_T;

src/nvim/CMakeLists.txt

@@ -397,11 +397,6 @@ endif()
 
 set(NVIM_EXEC_LINK_LIBRARIES ${NVIM_LINK_LIBRARIES} ${LUA_PREFERRED_LIBRARIES})
 
-# Don't use jemalloc in the unit test library.
-if(JEMALLOC_FOUND)
-  list(APPEND NVIM_EXEC_LINK_LIBRARIES ${JEMALLOC_LIBRARIES})
-endif()
-
 if(POLICY CMP0069)
   cmake_policy(SET CMP0069 NEW)
 endif()

src/nvim/memory.c

@@ -18,35 +18,15 @@
 #include "nvim/ui.h"
 #include "nvim/api/vim.h"
 
-#ifdef HAVE_JEMALLOC
-// Force je_ prefix on jemalloc functions.
-# define JEMALLOC_NO_DEMANGLE
-# include <jemalloc/jemalloc.h>
-#endif
-
 #ifdef UNIT_TESTING
 # define malloc(size) mem_malloc(size)
 # define calloc(count, size) mem_calloc(count, size)
 # define realloc(ptr, size) mem_realloc(ptr, size)
 # define free(ptr) mem_free(ptr)
-# ifdef HAVE_JEMALLOC
-MemMalloc mem_malloc = &je_malloc;
-MemFree mem_free = &je_free;
-MemCalloc mem_calloc = &je_calloc;
-MemRealloc mem_realloc = &je_realloc;
-# else
 MemMalloc mem_malloc = &malloc;
 MemFree mem_free = &free;
 MemCalloc mem_calloc = &calloc;
 MemRealloc mem_realloc = &realloc;
-# endif
-#else
-# ifdef HAVE_JEMALLOC
-#  define malloc(size) je_malloc(size)
-#  define calloc(count, size) je_calloc(count, size)
-#  define realloc(ptr, size) je_realloc(ptr, size)
-#  define free(ptr) je_free(ptr)
-# endif
 #endif
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS

src/nvim/version.c

@@ -62,12 +62,6 @@ static char *features[] = {
 "-iconv",
 #endif
 
-#ifdef HAVE_JEMALLOC
-"+jemalloc",
-#else
-"-jemalloc",
-#endif
-
 #ifdef FEAT_TUI
 "+tui",
 #else