memory: Replace klib memory pools by malloc/free

Klib pools were used to improve allocation efficiency for some small objects,
but it is not a thread-safe approach. Thread safety in allocations will be
required for implementing #2371).

src/nvim/eval.c

@@ -21,8 +21,6 @@
 #include <math.h>
 #include <limits.h>
 
-#include "nvim/lib/klist.h"
-
 #include "nvim/assert.h"
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
@@ -469,9 +467,6 @@ typedef struct {
   list_T *received;
   int status;
 } JobEvent;
-#define JobEventFreer(x)
-KMEMPOOL_INIT(JobEventPool, JobEvent, JobEventFreer)
-static kmempool_t(JobEventPool) *job_event_pool = NULL;
 static int disable_job_defer = 0;
 
 /*
@@ -508,8 +503,6 @@ void eval_init(void)
   set_vim_var_nr(VV_SEARCHFORWARD, 1L);
   set_vim_var_nr(VV_HLSEARCH, 1L);
   set_reg_var(0);    /* default for v:register is not 0 but '"' */
-
-  job_event_pool = kmp_init(JobEventPool);
 }
 
 #if defined(EXITFREE)
@@ -20149,7 +20142,7 @@ static inline bool is_user_job(Job *job)
 static inline void push_job_event(Job *job, ufunc_T *callback,
     const char *type, char *data, size_t count, int status)
 {
-  JobEvent *event_data = kmp_alloc(JobEventPool, job_event_pool);
+  JobEvent *event_data = xmalloc(sizeof(JobEvent));
   event_data->received = NULL;
   if (data) {
     event_data->received = list_alloc();
@@ -20317,7 +20310,7 @@ end:
     // exit event, safe to free job data now
     term_job_data_decref(ev->data);
   }
-  kmp_free(JobEventPool, job_event_pool, ev);
+  free(ev);
 }
 
 static void script_host_eval(char *name, typval_T *argvars, typval_T *rettv)

src/nvim/msgpack_rpc/channel.c

@@ -5,8 +5,6 @@
 #include <uv.h>
 #include <msgpack.h>
 
-#include "nvim/lib/klist.h"
-
 #include "nvim/api/private/helpers.h"
 #include "nvim/api/vim.h"
 #include "nvim/msgpack_rpc/channel.h"
@@ -69,10 +67,6 @@ typedef struct {
   uint64_t request_id;
 } RequestEvent;
 
-#define _noop(x)
-KMEMPOOL_INIT(RequestEventPool, RequestEvent, _noop)
-static kmempool_t(RequestEventPool) *request_event_pool = NULL;
-
 static uint64_t next_id = 1;
 static PMap(uint64_t) *channels = NULL;
 static PMap(cstr_t) *event_strings = NULL;
@@ -85,7 +79,6 @@ static msgpack_sbuffer out_buffer;
 /// Initializes the module
 void channel_init(void)
 {
-  request_event_pool = kmp_init(RequestEventPool);
   channels = pmap_new(uint64_t)();
   event_strings = pmap_new(cstr_t)();
   msgpack_sbuffer_init(&out_buffer);
@@ -455,7 +448,7 @@ static void handle_request(Channel *channel, msgpack_object *request)
   Array args = ARRAY_DICT_INIT;
   msgpack_rpc_to_array(request->via.array.ptr + 3, &args);
   bool defer = (!kv_size(channel->call_stack) && handler.defer);
-  RequestEvent *event_data = kmp_alloc(RequestEventPool, request_event_pool);
+  RequestEvent *event_data = xmalloc(sizeof(RequestEvent));
   event_data->channel = channel;
   event_data->handler = handler;
   event_data->args = args;
@@ -487,7 +480,7 @@ static void on_request_event(Event event)
   // All arguments were freed already, but we still need to free the array
   free(args.items);
   decref(channel);
-  kmp_free(RequestEventPool, request_event_pool, e);
+  free(e);
 }
 
 static bool channel_write(Channel *channel, WBuffer *buffer)

src/nvim/os/event.c

@@ -46,7 +46,6 @@ void event_init(void)
   // early msgpack-rpc initialization
   msgpack_rpc_init_method_table();
   msgpack_rpc_helpers_init();
-  wstream_init();
   // Initialize input events
   input_init();
   // Timer to wake the event loop if a timeout argument is passed to

src/nvim/os/signal.c

@@ -1,9 +1,8 @@
+#include <assert.h>
 #include <stdbool.h>
 
 #include <uv.h>
 
-#include "nvim/lib/klist.h"
-
 #include "nvim/ascii.h"
 #include "nvim/vim.h"
 #include "nvim/globals.h"
@@ -15,10 +14,6 @@
 #include "nvim/os/signal.h"
 #include "nvim/os/event.h"
 
-#define SignalEventFreer(x)
-KMEMPOOL_INIT(SignalEventPool, int, SignalEventFreer)
-kmempool_t(SignalEventPool) *signal_event_pool = NULL;
-
 static uv_signal_t spipe, shup, squit, sterm;
 #ifdef SIGPWR
 static uv_signal_t spwr;
@@ -32,7 +27,6 @@ static bool rejecting_deadly;
 
 void signal_init(void)
 {
-  signal_event_pool = kmp_init(SignalEventPool);
   uv_signal_init(uv_default_loop(), &spipe);
   uv_signal_init(uv_default_loop(), &shup);
   uv_signal_init(uv_default_loop(), &squit);
@@ -119,18 +113,16 @@ static void deadly_signal(int signum)
 
 static void signal_cb(uv_signal_t *handle, int signum)
 {
-  int *n = kmp_alloc(SignalEventPool, signal_event_pool);
-  *n = signum;
+  assert(signum >= 0);
   event_push((Event) {
     .handler = on_signal_event,
-    .data = n
+    .data = (void *)(uintptr_t)signum
   }, false);
 }
 
 static void on_signal_event(Event event)
 {
-  int signum = *((int *)event.data);
-  kmp_free(SignalEventPool, signal_event_pool, event.data);
+  int signum = (int)(uintptr_t)event.data;
 
   switch (signum) {
 #ifdef SIGPWR

src/nvim/os/wstream.c

@@ -5,8 +5,6 @@
 
 #include <uv.h>
 
-#include "nvim/lib/klist.h"
-
 #include "nvim/os/uv_helpers.h"
 #include "nvim/os/wstream.h"
 #include "nvim/os/wstream_defs.h"
@@ -41,24 +39,10 @@ typedef struct {
   uv_write_t uv_req;
 } WRequest;
 
-#define WRequestFreer(x)
-KMEMPOOL_INIT(WRequestPool, WRequest, WRequestFreer)
-kmempool_t(WRequestPool) *wrequest_pool = NULL;
-#define WBufferFreer(x)
-KMEMPOOL_INIT(WBufferPool, WBuffer, WBufferFreer)
-kmempool_t(WBufferPool) *wbuffer_pool = NULL;
-
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "os/wstream.c.generated.h"
 #endif
 
-/// Initialize pools for reusing commonly created objects
-void wstream_init(void)
-{
-  wrequest_pool = kmp_init(WRequestPool);
-  wbuffer_pool = kmp_init(WBufferPool);
-}
-
 /// Creates a new WStream instance. A WStream encapsulates all the boilerplate
 /// necessary for writing to a libuv stream.
 ///
@@ -163,7 +147,7 @@ bool wstream_write(WStream *wstream, WBuffer *buffer)
 
   wstream->curmem += buffer->size;
 
-  WRequest *data = kmp_alloc(WRequestPool, wrequest_pool);
+  WRequest *data = xmalloc(sizeof(WRequest));
   data->wstream = wstream;
   data->buffer = buffer;
   data->uv_req.data = data;
@@ -173,7 +157,7 @@ bool wstream_write(WStream *wstream, WBuffer *buffer)
   uvbuf.len = buffer->size;
 
   if (uv_write(&data->uv_req, wstream->stream, &uvbuf, 1, write_cb)) {
-    kmp_free(WRequestPool, wrequest_pool, data);
+    free(data);
     goto err;
   }
 
@@ -202,7 +186,7 @@ WBuffer *wstream_new_buffer(char *data,
                             size_t refcount,
                             wbuffer_data_finalizer cb)
 {
-  WBuffer *rv = kmp_alloc(WBufferPool, wbuffer_pool);
+  WBuffer *rv = xmalloc(sizeof(WBuffer));
   rv->size = size;
   rv->refcount = refcount;
   rv->cb = cb;
@@ -236,7 +220,7 @@ static void write_cb(uv_write_t *req, int status)
     }
   }
 
-  kmp_free(WRequestPool, wrequest_pool, data);
+  free(data);
 }
 
 void wstream_release_wbuffer(WBuffer *buffer)
@@ -246,7 +230,7 @@ void wstream_release_wbuffer(WBuffer *buffer)
       buffer->cb(buffer->data);
     }
 
-    kmp_free(WBufferPool, wbuffer_pool, buffer);
+    free(buffer);
   }
 }