Merge branch 'write_completion' of github.com:ctiller/grpc into write_completion

38 files changed, 282 insertions, 240 deletions

diff --git a/src/core/lib/channel/channel_stack_builder.c b/src/core/lib/channel/channel_stack_builder.c
index 7f2b8e07ce..2c991ea960 100644
--- a/src/core/lib/channel/channel_stack_builder.c
+++ b/src/core/lib/channel/channel_stack_builder.c
@@ -212,7 +212,7 @@ bool grpc_channel_stack_builder_prepend_filter(
 static void add_after(filter_node *before, const grpc_channel_filter *filter,
                       grpc_post_filter_create_init_func post_init_func,
                       void *user_data) {
-  filter_node *new = gpr_malloc(sizeof(*new));
+  filter_node *new = (filter_node *)gpr_malloc(sizeof(*new));
   new->next = before->next;
   new->prev = before;
   new->next->prev = new->prev->next = new;
diff --git a/src/core/lib/debug/trace.c b/src/core/lib/debug/trace.c
index c6c1853e20..7cb2789a19 100644
--- a/src/core/lib/debug/trace.c
+++ b/src/core/lib/debug/trace.c
@@ -39,7 +39,7 @@ static tracer *tracers;
 #endif
 
 void grpc_register_tracer(grpc_tracer_flag *flag) {
-  tracer *t = gpr_malloc(sizeof(*t));
+  tracer *t = (tracer *)gpr_malloc(sizeof(*t));
   t->flag = flag;
   t->next = tracers;
   TRACER_SET(*flag, false);
@@ -53,10 +53,10 @@ static void add(const char *beg, const char *end, char ***ss, size_t *ns) {
   size_t len;
   GPR_ASSERT(end >= beg);
   len = (size_t)(end - beg);
-  s = gpr_malloc(len + 1);
+  s = (char *)gpr_malloc(len + 1);
   memcpy(s, beg, len);
   s[len] = 0;
-  *ss = gpr_realloc(*ss, sizeof(char **) * np);
+  *ss = (char **)gpr_realloc(*ss, sizeof(char **) * np);
   (*ss)[n] = s;
   *ns = np;
 }
diff --git a/src/core/lib/iomgr/combiner.c b/src/core/lib/iomgr/combiner.c
index c2c2f01f7e..360967f3ba 100644
--- a/src/core/lib/iomgr/combiner.c
+++ b/src/core/lib/iomgr/combiner.c
@@ -74,7 +74,7 @@ static const grpc_closure_scheduler_vtable finally_scheduler = {
 static void offload(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error);
 
 grpc_combiner *grpc_combiner_create(void) {
-  grpc_combiner *lock = gpr_zalloc(sizeof(*lock));
+  grpc_combiner *lock = (grpc_combiner *)gpr_zalloc(sizeof(*lock));
   gpr_ref_init(&lock->refs, 1);
   lock->scheduler.vtable = &scheduler;
   lock->finally_scheduler.vtable = &finally_scheduler;
@@ -194,7 +194,7 @@ static void move_next(grpc_exec_ctx *exec_ctx) {
 }
 
 static void offload(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  grpc_combiner *lock = arg;
+  grpc_combiner *lock = (grpc_combiner *)arg;
   push_last_on_exec_ctx(exec_ctx, lock);
 }
 
diff --git a/src/core/lib/iomgr/ev_epollex_linux.c b/src/core/lib/iomgr/ev_epollex_linux.c
index 0e42f76af3..277347ac70 100644
--- a/src/core/lib/iomgr/ev_epollex_linux.c
+++ b/src/core/lib/iomgr/ev_epollex_linux.c
@@ -279,7 +279,7 @@ static void ref_by(grpc_fd *fd, int n) {
 }
 
 static void fd_destroy(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  grpc_fd *fd = arg;
+  grpc_fd *fd = (grpc_fd *)arg;
   /* Add the fd to the freelist */
   grpc_iomgr_unregister_object(&fd->iomgr_object);
   pollable_destroy(&fd->pollable);
@@ -340,7 +340,7 @@ static grpc_fd *fd_create(int fd, const char *name) {
   gpr_mu_unlock(&fd_freelist_mu);
 
   if (new_fd == NULL) {
-    new_fd = gpr_malloc(sizeof(grpc_fd));
+    new_fd = (grpc_fd *)gpr_malloc(sizeof(grpc_fd));
   }
 
   pollable_init(&new_fd->pollable, PO_FD);
@@ -556,7 +556,7 @@ static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx,
 static void do_kick_all(grpc_exec_ctx *exec_ctx, void *arg,
                         grpc_error *error_unused) {
   grpc_error *error = GRPC_ERROR_NONE;
-  grpc_pollset *pollset = arg;
+  grpc_pollset *pollset = (grpc_pollset *)arg;
   gpr_mu_lock(&pollset->pollable.po.mu);
   if (pollset->root_worker != NULL) {
     grpc_pollset_worker *worker = pollset->root_worker;
@@ -1012,7 +1012,7 @@ static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
 
 static void unref_fd_no_longer_poller(grpc_exec_ctx *exec_ctx, void *arg,
                                       grpc_error *error) {
-  grpc_fd *fd = arg;
+  grpc_fd *fd = (grpc_fd *)arg;
   UNREF_BY(exec_ctx, fd, 2, "pollset_pollable");
 }
 
@@ -1081,7 +1081,7 @@ static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
  */
 
 static grpc_pollset_set *pollset_set_create(void) {
-  grpc_pollset_set *pss = gpr_zalloc(sizeof(*pss));
+  grpc_pollset_set *pss = (grpc_pollset_set *)gpr_zalloc(sizeof(*pss));
   po_init(&pss->po, PO_POLLSET_SET);
   return pss;
 }
@@ -1243,7 +1243,7 @@ static void pg_broadcast(grpc_exec_ctx *exec_ctx, polling_group *from,
 static void pg_create(grpc_exec_ctx *exec_ctx, polling_obj **initial_po,
                       size_t initial_po_count) {
   /* assumes all polling objects in initial_po are locked */
-  polling_group *pg = gpr_malloc(sizeof(*pg));
+  polling_group *pg = (polling_group *)gpr_malloc(sizeof(*pg));
   po_init(&pg->po, PO_POLLING_GROUP);
   gpr_ref_init(&pg->refs, (int)initial_po_count);
   for (size_t i = 0; i < initial_po_count; i++) {
@@ -1353,7 +1353,7 @@ static void pg_merge(grpc_exec_ctx *exec_ctx, polling_group *a,
     gpr_mu_lock(&po->mu);
     if (unref_count == unref_cap) {
       unref_cap = GPR_MAX(8, 3 * unref_cap / 2);
-      unref = gpr_realloc(unref, unref_cap * sizeof(*unref));
+      unref = (polling_group **)gpr_realloc(unref, unref_cap * sizeof(*unref));
     }
     unref[unref_count++] = po->group;
     po->group = pg_ref(a);
diff --git a/src/core/lib/iomgr/ev_epollsig_linux.c b/src/core/lib/iomgr/ev_epollsig_linux.c
index 59c7cdc285..b88c3ba111 100644
--- a/src/core/lib/iomgr/ev_epollsig_linux.c
+++ b/src/core/lib/iomgr/ev_epollsig_linux.c
@@ -363,7 +363,8 @@ static void polling_island_add_fds_locked(polling_island *pi, grpc_fd **fds,
 
     if (pi->fd_cnt == pi->fd_capacity) {
       pi->fd_capacity = GPR_MAX(pi->fd_capacity + 8, pi->fd_cnt * 3 / 2);
-      pi->fds = gpr_realloc(pi->fds, sizeof(grpc_fd *) * pi->fd_capacity);
+      pi->fds =
+          (grpc_fd **)gpr_realloc(pi->fds, sizeof(grpc_fd *) * pi->fd_capacity);
     }
 
     pi->fds[pi->fd_cnt++] = fds[i];
@@ -466,7 +467,7 @@ static polling_island *polling_island_create(grpc_exec_ctx *exec_ctx,
 
   *error = GRPC_ERROR_NONE;
 
-  pi = gpr_malloc(sizeof(*pi));
+  pi = (polling_island *)gpr_malloc(sizeof(*pi));
   gpr_mu_init(&pi->mu);
   pi->fd_cnt = 0;
   pi->fd_capacity = 0;
@@ -810,7 +811,7 @@ static grpc_fd *fd_create(int fd, const char *name) {
   gpr_mu_unlock(&fd_freelist_mu);
 
   if (new_fd == NULL) {
-    new_fd = gpr_malloc(sizeof(grpc_fd));
+    new_fd = (grpc_fd *)gpr_malloc(sizeof(grpc_fd));
     gpr_mu_init(&new_fd->po.mu);
   }
 
@@ -1273,7 +1274,7 @@ static void pollset_work_and_unlock(grpc_exec_ctx *exec_ctx,
          to the function pollset_work_and_unlock() will pick up the correct
          epoll_fd */
     } else {
-      grpc_fd *fd = data_ptr;
+      grpc_fd *fd = (grpc_fd *)data_ptr;
       int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP);
       int read_ev = ep_ev[i].events & (EPOLLIN | EPOLLPRI);
       int write_ev = ep_ev[i].events & EPOLLOUT;
@@ -1569,7 +1570,7 @@ static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
  */
 
 static grpc_pollset_set *pollset_set_create(void) {
-  grpc_pollset_set *pss = gpr_malloc(sizeof(*pss));
+  grpc_pollset_set *pss = (grpc_pollset_set *)gpr_malloc(sizeof(*pss));
   gpr_mu_init(&pss->po.mu);
   pss->po.pi = NULL;
 #ifndef NDEBUG
@@ -1647,8 +1648,8 @@ void *grpc_pollset_get_polling_island(grpc_pollset *ps) {
 }
 
 bool grpc_are_polling_islands_equal(void *p, void *q) {
-  polling_island *p1 = p;
-  polling_island *p2 = q;
+  polling_island *p1 = (polling_island *)p;
+  polling_island *p2 = (polling_island *)q;
 
   /* Note: polling_island_lock_pair() may change p1 and p2 to point to the
      latest polling islands in their respective linked lists */
diff --git a/src/core/lib/iomgr/ev_poll_posix.c b/src/core/lib/iomgr/ev_poll_posix.c
index ebf22a8d9d..bcf1d9001b 100644
--- a/src/core/lib/iomgr/ev_poll_posix.c
+++ b/src/core/lib/iomgr/ev_poll_posix.c
@@ -327,7 +327,7 @@ static void unref_by(grpc_fd *fd, int n) {
 }
 
 static grpc_fd *fd_create(int fd, const char *name) {
-  grpc_fd *r = gpr_malloc(sizeof(*r));
+  grpc_fd *r = (grpc_fd *)gpr_malloc(sizeof(*r));
   gpr_mu_init(&r->mu);
   gpr_atm_rel_store(&r->refst, 1);
   r->shutdown = 0;
@@ -842,8 +842,8 @@ static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
   if (pollset->fd_count == pollset->fd_capacity) {
     pollset->fd_capacity =
         GPR_MAX(pollset->fd_capacity + 8, pollset->fd_count * 3 / 2);
-    pollset->fds =
-        gpr_realloc(pollset->fds, sizeof(grpc_fd *) * pollset->fd_capacity);
+    pollset->fds = (grpc_fd **)gpr_realloc(
+        pollset->fds, sizeof(grpc_fd *) * pollset->fd_capacity);
   }
   pollset->fds[pollset->fd_count++] = fd;
   GRPC_FD_REF(fd, "multipoller");
@@ -895,7 +895,8 @@ static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
     worker.wakeup_fd = pollset->local_wakeup_cache;
     pollset->local_wakeup_cache = worker.wakeup_fd->next;
   } else {
-    worker.wakeup_fd = gpr_malloc(sizeof(*worker.wakeup_fd));
+    worker.wakeup_fd =
+        (grpc_cached_wakeup_fd *)gpr_malloc(sizeof(*worker.wakeup_fd));
     error = grpc_wakeup_fd_init(&worker.wakeup_fd->fd);
     if (error != GRPC_ERROR_NONE) {
       GRPC_LOG_IF_ERROR("pollset_work", GRPC_ERROR_REF(error));
@@ -950,8 +951,8 @@ static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
         const size_t pfd_size = sizeof(*pfds) * (pollset->fd_count + 2);
         const size_t watch_size = sizeof(*watchers) * (pollset->fd_count + 2);
         void *buf = gpr_malloc(pfd_size + watch_size);
-        pfds = buf;
-        watchers = (void *)((char *)buf + pfd_size);
+        pfds = (struct pollfd *)buf;
+        watchers = (grpc_fd_watcher *)(void *)((char *)buf + pfd_size);
       }
 
       fd_count = 0;
@@ -1143,7 +1144,8 @@ static int poll_deadline_to_millis_timeout(gpr_timespec deadline,
  */
 
 static grpc_pollset_set *pollset_set_create(void) {
-  grpc_pollset_set *pollset_set = gpr_zalloc(sizeof(*pollset_set));
+  grpc_pollset_set *pollset_set =
+      (grpc_pollset_set *)gpr_zalloc(sizeof(*pollset_set));
   gpr_mu_init(&pollset_set->mu);
   return pollset_set;
 }
@@ -1186,9 +1188,9 @@ static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx,
   if (pollset_set->pollset_count == pollset_set->pollset_capacity) {
     pollset_set->pollset_capacity =
         GPR_MAX(8, 2 * pollset_set->pollset_capacity);
-    pollset_set->pollsets =
-        gpr_realloc(pollset_set->pollsets, pollset_set->pollset_capacity *
-                                               sizeof(*pollset_set->pollsets));
+    pollset_set->pollsets = (grpc_pollset **)gpr_realloc(
+        pollset_set->pollsets,
+        pollset_set->pollset_capacity * sizeof(*pollset_set->pollsets));
   }
   pollset_set->pollsets[pollset_set->pollset_count++] = pollset;
   for (i = 0, j = 0; i < pollset_set->fd_count; i++) {
@@ -1237,9 +1239,9 @@ static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx,
   gpr_mu_lock(&bag->mu);
   if (bag->pollset_set_count == bag->pollset_set_capacity) {
     bag->pollset_set_capacity = GPR_MAX(8, 2 * bag->pollset_set_capacity);
-    bag->pollset_sets =
-        gpr_realloc(bag->pollset_sets,
-                    bag->pollset_set_capacity * sizeof(*bag->pollset_sets));
+    bag->pollset_sets = (grpc_pollset_set **)gpr_realloc(
+        bag->pollset_sets,
+        bag->pollset_set_capacity * sizeof(*bag->pollset_sets));
   }
   bag->pollset_sets[bag->pollset_set_count++] = item;
   for (i = 0, j = 0; i < bag->fd_count; i++) {
@@ -1276,7 +1278,7 @@ static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx,
   gpr_mu_lock(&pollset_set->mu);
   if (pollset_set->fd_count == pollset_set->fd_capacity) {
     pollset_set->fd_capacity = GPR_MAX(8, 2 * pollset_set->fd_capacity);
-    pollset_set->fds = gpr_realloc(
+    pollset_set->fds = (grpc_fd **)gpr_realloc(
         pollset_set->fds, pollset_set->fd_capacity * sizeof(*pollset_set->fds));
   }
   GRPC_FD_REF(fd, "pollset_set");
@@ -1330,11 +1332,12 @@ static void cache_insert_locked(poll_args *args) {
 }
 
 static void init_result(poll_args *pargs) {
-  pargs->result = gpr_malloc(sizeof(poll_result));
+  pargs->result = (poll_result *)gpr_malloc(sizeof(poll_result));
   gpr_ref_init(&pargs->result->refcount, 1);
   pargs->result->watchers = NULL;
   pargs->result->watchcount = 0;
-  pargs->result->fds = gpr_malloc(sizeof(struct pollfd) * pargs->nfds);
+  pargs->result->fds =
+      (struct pollfd *)gpr_malloc(sizeof(struct pollfd) * pargs->nfds);
   memcpy(pargs->result->fds, pargs->fds, sizeof(struct pollfd) * pargs->nfds);
   pargs->result->nfds = pargs->nfds;
   pargs->result->retval = 0;
@@ -1373,7 +1376,7 @@ static poll_args *get_poller_locked(struct pollfd *fds, nfds_t count) {
     return pargs;
   }
 
-  poll_args *pargs = gpr_malloc(sizeof(struct poll_args));
+  poll_args *pargs = (poll_args *)gpr_malloc(sizeof(struct poll_args));
   gpr_cv_init(&pargs->trigger);
   pargs->fds = fds;
   pargs->nfds = count;
@@ -1420,7 +1423,8 @@ static void cache_poller_locked(poll_args *args) {
     poll_args **old_active_pollers = poll_cache.active_pollers;
     poll_cache.size = poll_cache.size * 2;
     poll_cache.count = 0;
-    poll_cache.active_pollers = gpr_malloc(sizeof(void *) * poll_cache.size);
+    poll_cache.active_pollers =
+        (poll_args **)gpr_malloc(sizeof(void *) * poll_cache.size);
     for (unsigned int i = 0; i < poll_cache.size; i++) {
       poll_cache.active_pollers[i] = NULL;
     }
@@ -1525,12 +1529,12 @@ static int cvfd_poll(struct pollfd *fds, nfds_t nfds, int timeout) {
   nfds_t nsockfds = 0;
   poll_result *result = NULL;
   gpr_mu_lock(&g_cvfds.mu);
-  pollcv = gpr_malloc(sizeof(cv_node));
+  pollcv = (cv_node *)gpr_malloc(sizeof(cv_node));
   pollcv->next = NULL;
   gpr_cv pollcv_cv;
   gpr_cv_init(&pollcv_cv);
   pollcv->cv = &pollcv_cv;
-  cv_node *fd_cvs = gpr_malloc(nfds * sizeof(cv_node));
+  cv_node *fd_cvs = (cv_node *)gpr_malloc(nfds * sizeof(cv_node));
 
   for (i = 0; i < nfds; i++) {
     fds[i].revents = 0;
@@ -1562,7 +1566,8 @@ static int cvfd_poll(struct pollfd *fds, nfds_t nfds, int timeout) {
 
   res = 0;
   if (!skip_poll && nsockfds > 0) {
-    struct pollfd *pollfds = gpr_malloc(sizeof(struct pollfd) * nsockfds);
+    struct pollfd *pollfds =
+        (struct pollfd *)gpr_malloc(sizeof(struct pollfd) * nsockfds);
     idx = 0;
     for (i = 0; i < nfds; i++) {
       if (fds[i].fd >= 0) {
@@ -1625,7 +1630,8 @@ static void global_cv_fd_table_init() {
   gpr_cv_init(&g_cvfds.shutdown_cv);
   gpr_ref_init(&g_cvfds.pollcount, 1);
   g_cvfds.size = CV_DEFAULT_TABLE_SIZE;
-  g_cvfds.cvfds = gpr_malloc(sizeof(fd_node) * CV_DEFAULT_TABLE_SIZE);
+  g_cvfds.cvfds =
+      (fd_node *)gpr_malloc(sizeof(fd_node) * CV_DEFAULT_TABLE_SIZE);
   g_cvfds.free_fds = NULL;
   thread_grace = gpr_time_from_millis(POLLCV_THREAD_GRACE_MS, GPR_TIMESPAN);
   for (int i = 0; i < CV_DEFAULT_TABLE_SIZE; i++) {
@@ -1642,7 +1648,7 @@ static void global_cv_fd_table_init() {
   poll_cache.size = 32;
   poll_cache.count = 0;
   poll_cache.free_pollers = NULL;
-  poll_cache.active_pollers = gpr_malloc(sizeof(void *) * 32);
+  poll_cache.active_pollers = (poll_args **)gpr_malloc(sizeof(void *) * 32);
   for (unsigned int i = 0; i < poll_cache.size; i++) {
     poll_cache.active_pollers[i] = NULL;
   }
diff --git a/src/core/lib/iomgr/ev_posix.c b/src/core/lib/iomgr/ev_posix.c
index bb43061ff5..d881e2d4dd 100644
--- a/src/core/lib/iomgr/ev_posix.c
+++ b/src/core/lib/iomgr/ev_posix.c
@@ -76,10 +76,10 @@ static void add(const char *beg, const char *end, char ***ss, size_t *ns) {
   size_t len;
   GPR_ASSERT(end >= beg);
   len = (size_t)(end - beg);
-  s = gpr_malloc(len + 1);
+  s = (char *)gpr_malloc(len + 1);
   memcpy(s, beg, len);
   s[len] = 0;
-  *ss = gpr_realloc(*ss, sizeof(char **) * np);
+  *ss = (char **)gpr_realloc(*ss, sizeof(char **) * np);
   (*ss)[n] = s;
   *ns = np;
 }
diff --git a/src/core/lib/iomgr/executor.c b/src/core/lib/iomgr/executor.c
index 6e8c896ed6..892385d7d7 100644
--- a/src/core/lib/iomgr/executor.c
+++ b/src/core/lib/iomgr/executor.c
@@ -95,7 +95,8 @@ void grpc_executor_set_threading(grpc_exec_ctx *exec_ctx, bool threading) {
     g_max_threads = GPR_MAX(1, 2 * gpr_cpu_num_cores());
     gpr_atm_no_barrier_store(&g_cur_threads, 1);
     gpr_tls_init(&g_this_thread_state);
-    g_thread_state = gpr_zalloc(sizeof(thread_state) * g_max_threads);
+    g_thread_state =
+        (thread_state *)gpr_zalloc(sizeof(thread_state) * g_max_threads);
     for (size_t i = 0; i < g_max_threads; i++) {
       gpr_mu_init(&g_thread_state[i].mu);
       gpr_cv_init(&g_thread_state[i].cv);
@@ -143,7 +144,7 @@ void grpc_executor_shutdown(grpc_exec_ctx *exec_ctx) {
 }
 
 static void executor_thread(void *arg) {
-  thread_state *ts = arg;
+  thread_state *ts = (thread_state *)arg;
   gpr_tls_set(&g_this_thread_state, (intptr_t)ts);
 
   grpc_exec_ctx exec_ctx =
diff --git a/src/core/lib/iomgr/load_file.c b/src/core/lib/iomgr/load_file.c
index ba77a52afc..0b4d41ea4b 100644
--- a/src/core/lib/iomgr/load_file.c
+++ b/src/core/lib/iomgr/load_file.c
@@ -47,7 +47,8 @@ grpc_error *grpc_load_file(const char *filename, int add_null_terminator,
   /* Converting to size_t on the assumption that it will not fail */
   contents_size = (size_t)ftell(file);
   fseek(file, 0, SEEK_SET);
-  contents = gpr_malloc(contents_size + (add_null_terminator ? 1 : 0));
+  contents = (unsigned char *)gpr_malloc(contents_size +
+                                         (add_null_terminator ? 1 : 0));
   bytes_read = fread(contents, 1, contents_size, file);
   if (bytes_read < contents_size) {
     error = GRPC_OS_ERROR(errno, "fread");
diff --git a/src/core/lib/iomgr/resolve_address_posix.c b/src/core/lib/iomgr/resolve_address_posix.c
index 2bb00e5eed..082e3b7947 100644
--- a/src/core/lib/iomgr/resolve_address_posix.c
+++ b/src/core/lib/iomgr/resolve_address_posix.c
@@ -112,13 +112,14 @@ static grpc_error *blocking_resolve_address_impl(
   }
 
   /* Success path: set addrs non-NULL, fill it in */
-  *addresses = gpr_malloc(sizeof(grpc_resolved_addresses));
+  *addresses =
+      (grpc_resolved_addresses *)gpr_malloc(sizeof(grpc_resolved_addresses));
   (*addresses)->naddrs = 0;
   for (resp = result; resp != NULL; resp = resp->ai_next) {
     (*addresses)->naddrs++;
   }
-  (*addresses)->addrs =
-      gpr_malloc(sizeof(grpc_resolved_address) * (*addresses)->naddrs);
+  (*addresses)->addrs = (grpc_resolved_address *)gpr_malloc(
+      sizeof(grpc_resolved_address) * (*addresses)->naddrs);
   i = 0;
   for (resp = result; resp != NULL; resp = resp->ai_next) {
     memcpy(&(*addresses)->addrs[i].addr, resp->ai_addr, resp->ai_addrlen);
@@ -153,7 +154,7 @@ typedef struct {
  * grpc_blocking_resolve_address */
 static void do_request_thread(grpc_exec_ctx *exec_ctx, void *rp,
                               grpc_error *error) {
-  request *r = rp;
+  request *r = (request *)rp;
   GRPC_CLOSURE_SCHED(
       exec_ctx, r->on_done,
       grpc_blocking_resolve_address(r->name, r->default_port, r->addrs_out));
@@ -174,7 +175,7 @@ static void resolve_address_impl(grpc_exec_ctx *exec_ctx, const char *name,
                                  grpc_pollset_set *interested_parties,
                                  grpc_closure *on_done,
                                  grpc_resolved_addresses **addrs) {
-  request *r = gpr_malloc(sizeof(request));
+  request *r = (request *)gpr_malloc(sizeof(request));
   GRPC_CLOSURE_INIT(&r->request_closure, do_request_thread, r,
                     grpc_executor_scheduler(GRPC_EXECUTOR_SHORT));
   r->name = gpr_strdup(name);
diff --git a/src/core/lib/iomgr/resource_quota.c b/src/core/lib/iomgr/resource_quota.c
index a31d9eef93..6c58986b53 100644
--- a/src/core/lib/iomgr/resource_quota.c
+++ b/src/core/lib/iomgr/resource_quota.c
@@ -241,7 +241,7 @@ static bool rq_reclaim(grpc_exec_ctx *exec_ctx,
                        grpc_resource_quota *resource_quota, bool destructive);
 
 static void rq_step(grpc_exec_ctx *exec_ctx, void *rq, grpc_error *error) {
-  grpc_resource_quota *resource_quota = rq;
+  grpc_resource_quota *resource_quota = (grpc_resource_quota *)rq;
   resource_quota->step_scheduled = false;
   do {
     if (rq_alloc(exec_ctx, resource_quota)) goto done;
@@ -380,12 +380,12 @@ typedef struct {
 } ru_slice_refcount;
 
 static void ru_slice_ref(void *p) {
-  ru_slice_refcount *rc = p;
+  ru_slice_refcount *rc = (ru_slice_refcount *)p;
   gpr_ref(&rc->refs);
 }
 
 static void ru_slice_unref(grpc_exec_ctx *exec_ctx, void *p) {
-  ru_slice_refcount *rc = p;
+  ru_slice_refcount *rc = (ru_slice_refcount *)p;
   if (gpr_unref(&rc->refs)) {
     grpc_resource_user_free(exec_ctx, rc->resource_user, rc->size);
     gpr_free(rc);
@@ -398,7 +398,8 @@ static const grpc_slice_refcount_vtable ru_slice_vtable = {
 
 static grpc_slice ru_slice_create(grpc_resource_user *resource_user,
                                   size_t size) {
-  ru_slice_refcount *rc = gpr_malloc(sizeof(ru_slice_refcount) + size);
+  ru_slice_refcount *rc =
+      (ru_slice_refcount *)gpr_malloc(sizeof(ru_slice_refcount) + size);
   rc->base.vtable = &ru_slice_vtable;
   rc->base.sub_refcount = &rc->base;
   gpr_ref_init(&rc->refs, 1);
@@ -417,7 +418,7 @@ static grpc_slice ru_slice_create(grpc_resource_user *resource_user,
  */
 
 static void ru_allocate(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   if (rulist_empty(resource_user->resource_quota,
                    GRPC_RULIST_AWAITING_ALLOCATION)) {
     rq_step_sched(exec_ctx, resource_user->resource_quota);
@@ -427,7 +428,7 @@ static void ru_allocate(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
 
 static void ru_add_to_free_pool(grpc_exec_ctx *exec_ctx, void *ru,
                                 grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   if (!rulist_empty(resource_user->resource_quota,
                     GRPC_RULIST_AWAITING_ALLOCATION) &&
       rulist_empty(resource_user->resource_quota,
@@ -454,7 +455,7 @@ static bool ru_post_reclaimer(grpc_exec_ctx *exec_ctx,
 
 static void ru_post_benign_reclaimer(grpc_exec_ctx *exec_ctx, void *ru,
                                      grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   if (!ru_post_reclaimer(exec_ctx, resource_user, false)) return;
   if (!rulist_empty(resource_user->resource_quota,
                     GRPC_RULIST_AWAITING_ALLOCATION) &&
@@ -469,7 +470,7 @@ static void ru_post_benign_reclaimer(grpc_exec_ctx *exec_ctx, void *ru,
 
 static void ru_post_destructive_reclaimer(grpc_exec_ctx *exec_ctx, void *ru,
                                           grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   if (!ru_post_reclaimer(exec_ctx, resource_user, true)) return;
   if (!rulist_empty(resource_user->resource_quota,
                     GRPC_RULIST_AWAITING_ALLOCATION) &&
@@ -485,7 +486,7 @@ static void ru_post_destructive_reclaimer(grpc_exec_ctx *exec_ctx, void *ru,
 }
 
 static void ru_shutdown(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   GRPC_CLOSURE_SCHED(exec_ctx, resource_user->reclaimers[0],
                      GRPC_ERROR_CANCELLED);
   GRPC_CLOSURE_SCHED(exec_ctx, resource_user->reclaimers[1],
@@ -497,7 +498,7 @@ static void ru_shutdown(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
 }
 
 static void ru_destroy(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
-  grpc_resource_user *resource_user = ru;
+  grpc_resource_user *resource_user = (grpc_resource_user *)ru;
   GPR_ASSERT(gpr_atm_no_barrier_load(&resource_user->refs) == 0);
   for (int i = 0; i < GRPC_RULIST_COUNT; i++) {
     rulist_remove(resource_user, (grpc_rulist)i);
@@ -518,7 +519,8 @@ static void ru_destroy(grpc_exec_ctx *exec_ctx, void *ru, grpc_error *error) {
 
 static void ru_allocated_slices(grpc_exec_ctx *exec_ctx, void *arg,
                                 grpc_error *error) {
-  grpc_resource_user_slice_allocator *slice_allocator = arg;
+  grpc_resource_user_slice_allocator *slice_allocator =
+      (grpc_resource_user_slice_allocator *)arg;
   if (error == GRPC_ERROR_NONE) {
     for (size_t i = 0; i < slice_allocator->count; i++) {
       grpc_slice_buffer_add_indexed(
@@ -541,7 +543,7 @@ typedef struct {
 } rq_resize_args;
 
 static void rq_resize(grpc_exec_ctx *exec_ctx, void *args, grpc_error *error) {
-  rq_resize_args *a = args;
+  rq_resize_args *a = (rq_resize_args *)args;
   int64_t delta = a->size - a->resource_quota->size;
   a->resource_quota->size += delta;
   a->resource_quota->free_pool += delta;
@@ -553,7 +555,7 @@ static void rq_resize(grpc_exec_ctx *exec_ctx, void *args, grpc_error *error) {
 
 static void rq_reclamation_done(grpc_exec_ctx *exec_ctx, void *rq,
                                 grpc_error *error) {
-  grpc_resource_quota *resource_quota = rq;
+  grpc_resource_quota *resource_quota = (grpc_resource_quota *)rq;
   resource_quota->reclaiming = false;
   rq_step_sched(exec_ctx, resource_quota);
   grpc_resource_quota_unref_internal(exec_ctx, resource_quota);
@@ -565,7 +567,8 @@ static void rq_reclamation_done(grpc_exec_ctx *exec_ctx, void *rq,
 
 /* Public API */
 grpc_resource_quota *grpc_resource_quota_create(const char *name) {
-  grpc_resource_quota *resource_quota = gpr_malloc(sizeof(*resource_quota));
+  grpc_resource_quota *resource_quota =
+      (grpc_resource_quota *)gpr_malloc(sizeof(*resource_quota));
   gpr_ref_init(&resource_quota->refs, 1);
   resource_quota->combiner = grpc_combiner_create();
   resource_quota->free_pool = INT64_MAX;
@@ -629,7 +632,7 @@ double grpc_resource_quota_get_memory_pressure(
 void grpc_resource_quota_resize(grpc_resource_quota *resource_quota,
                                 size_t size) {
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
-  rq_resize_args *a = gpr_malloc(sizeof(*a));
+  rq_resize_args *a = (rq_resize_args *)gpr_malloc(sizeof(*a));
   a->resource_quota = grpc_resource_quota_ref_internal(resource_quota);
   a->size = (int64_t)size;
   gpr_atm_no_barrier_store(&resource_quota->last_size,
@@ -684,7 +687,8 @@ const grpc_arg_pointer_vtable *grpc_resource_quota_arg_vtable(void) {
 
 grpc_resource_user *grpc_resource_user_create(
     grpc_resource_quota *resource_quota, const char *name) {
-  grpc_resource_user *resource_user = gpr_malloc(sizeof(*resource_user));
+  grpc_resource_user *resource_user =
+      (grpc_resource_user *)gpr_malloc(sizeof(*resource_user));
   resource_user->resource_quota =
       grpc_resource_quota_ref_internal(resource_quota);
   GRPC_CLOSURE_INIT(&resource_user->allocate_closure, &ru_allocate,
diff --git a/src/core/lib/iomgr/tcp_client_posix.c b/src/core/lib/iomgr/tcp_client_posix.c
index a25fba4527..39dbb506e2 100644
--- a/src/core/lib/iomgr/tcp_client_posix.c
+++ b/src/core/lib/iomgr/tcp_client_posix.c
@@ -80,7 +80,8 @@ static grpc_error *prepare_socket(const grpc_resolved_address *addr, int fd,
     for (size_t i = 0; i < channel_args->num_args; i++) {
       if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_SOCKET_MUTATOR)) {
         GPR_ASSERT(channel_args->args[i].type == GRPC_ARG_POINTER);
-        grpc_socket_mutator *mutator = channel_args->args[i].value.pointer.p;
+        grpc_socket_mutator *mutator =
+            (grpc_socket_mutator *)channel_args->args[i].value.pointer.p;
         err = grpc_set_socket_with_mutator(fd, mutator);
         if (err != GRPC_ERROR_NONE) goto error;
       }
@@ -98,7 +99,7 @@ done:
 
 static void tc_on_alarm(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) {
   int done;
-  async_connect *ac = acp;
+  async_connect *ac = (async_connect *)acp;
   if (GRPC_TRACER_ON(grpc_tcp_trace)) {
     const char *str = grpc_error_string(error);
     gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: error=%s", ac->addr_str,
@@ -126,7 +127,7 @@ grpc_endpoint *grpc_tcp_client_create_from_fd(
 }
 
 static void on_writable(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) {
-  async_connect *ac = acp;
+  async_connect *ac = (async_connect *)acp;
   int so_error = 0;
   socklen_t so_error_size;
   int err;
@@ -304,7 +305,7 @@ static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx,
 
   grpc_pollset_set_add_fd(exec_ctx, interested_parties, fdobj);
 
-  ac = gpr_malloc(sizeof(async_connect));
+  ac = (async_connect *)gpr_malloc(sizeof(async_connect));
   ac->closure = closure;
   ac->ep = ep;
   ac->fd = fdobj;
diff --git a/src/core/lib/iomgr/tcp_server_posix.c b/src/core/lib/iomgr/tcp_server_posix.c
index 0fc5c0fd86..c3ec3e447a 100644
--- a/src/core/lib/iomgr/tcp_server_posix.c
+++ b/src/core/lib/iomgr/tcp_server_posix.c
@@ -74,7 +74,7 @@ grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx,
                                    grpc_tcp_server **server) {
   gpr_once_init(&check_init, init);
 
-  grpc_tcp_server *s = gpr_zalloc(sizeof(grpc_tcp_server));
+  grpc_tcp_server *s = (grpc_tcp_server *)gpr_zalloc(sizeof(grpc_tcp_server));
   s->so_reuseport = has_so_reuseport;
   s->expand_wildcard_addrs = false;
   for (size_t i = 0; i < (args == NULL ? 0 : args->num_args); i++) {
@@ -138,7 +138,7 @@ static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
 
 static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server,
                            grpc_error *error) {
-  grpc_tcp_server *s = server;
+  grpc_tcp_server *s = (grpc_tcp_server *)server;
   gpr_mu_lock(&s->mu);
   s->destroyed_ports++;
   if (s->destroyed_ports == s->nports) {
@@ -197,7 +197,7 @@ static void tcp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
 
 /* event manager callback when reads are ready */
 static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) {
-  grpc_tcp_listener *sp = arg;
+  grpc_tcp_listener *sp = (grpc_tcp_listener *)arg;
 
   if (err != GRPC_ERROR_NONE) {
     goto error;
@@ -251,7 +251,8 @@ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) {
     grpc_pollset_add_fd(exec_ctx, read_notifier_pollset, fdobj);
 
     // Create acceptor.
-    grpc_tcp_server_acceptor *acceptor = gpr_malloc(sizeof(*acceptor));
+    grpc_tcp_server_acceptor *acceptor =
+        (grpc_tcp_server_acceptor *)gpr_malloc(sizeof(*acceptor));
     acceptor->from_server = sp->server;
     acceptor->port_index = sp->port_index;
     acceptor->fd_index = sp->fd_index;
@@ -365,7 +366,7 @@ static grpc_error *clone_port(grpc_tcp_listener *listener, unsigned count) {
     listener->server->nports++;
     grpc_sockaddr_to_string(&addr_str, &listener->addr, 1);
     gpr_asprintf(&name, "tcp-server-listener:%s/clone-%d", addr_str, i);
-    sp = gpr_malloc(sizeof(grpc_tcp_listener));
+    sp = (grpc_tcp_listener *)gpr_malloc(sizeof(grpc_tcp_listener));
     sp->next = listener->next;
     listener->next = sp;
     /* sp (the new listener) is a sibling of 'listener' (the original
diff --git a/src/core/lib/iomgr/tcp_server_utils_posix_common.c b/src/core/lib/iomgr/tcp_server_utils_posix_common.c
index ad535bc43e..a828bee074 100644
--- a/src/core/lib/iomgr/tcp_server_utils_posix_common.c
+++ b/src/core/lib/iomgr/tcp_server_utils_posix_common.c
@@ -93,7 +93,7 @@ static grpc_error *add_socket_to_server(grpc_tcp_server *s, int fd,
     gpr_mu_lock(&s->mu);
     s->nports++;
     GPR_ASSERT(!s->on_accept_cb && "must add ports before starting server");
-    sp = gpr_malloc(sizeof(grpc_tcp_listener));
+    sp = (grpc_tcp_listener *)gpr_malloc(sizeof(grpc_tcp_listener));
     sp->next = NULL;
     if (s->head == NULL) {
       s->head = sp;
diff --git a/src/core/lib/iomgr/timer_heap.c b/src/core/lib/iomgr/timer_heap.c
index a70e3942b2..2648d5da5d 100644
--- a/src/core/lib/iomgr/timer_heap.c
+++ b/src/core/lib/iomgr/timer_heap.c
@@ -74,8 +74,8 @@ static void maybe_shrink(grpc_timer_heap *heap) {
   if (heap->timer_count >= 8 &&
       heap->timer_count <= heap->timer_capacity / SHRINK_FULLNESS_FACTOR / 2) {
     heap->timer_capacity = heap->timer_count * SHRINK_FULLNESS_FACTOR;
-    heap->timers =
-        gpr_realloc(heap->timers, heap->timer_capacity * sizeof(grpc_timer *));
+    heap->timers = (grpc_timer **)gpr_realloc(
+        heap->timers, heap->timer_capacity * sizeof(grpc_timer *));
   }
 }
 
@@ -99,8 +99,8 @@ int grpc_timer_heap_add(grpc_timer_heap *heap, grpc_timer *timer) {
   if (heap->timer_count == heap->timer_capacity) {
     heap->timer_capacity =
         GPR_MAX(heap->timer_capacity + 1, heap->timer_capacity * 3 / 2);
-    heap->timers =
-        gpr_realloc(heap->timers, heap->timer_capacity * sizeof(grpc_timer *));
+    heap->timers = (grpc_timer **)gpr_realloc(
+        heap->timers, heap->timer_capacity * sizeof(grpc_timer *));
   }
   timer->heap_index = heap->timer_count;
   adjust_upwards(heap->timers, heap->timer_count, timer);
diff --git a/src/core/lib/iomgr/timer_manager.c b/src/core/lib/iomgr/timer_manager.c
index 631f7935d9..ae2c0bf0ae 100644
--- a/src/core/lib/iomgr/timer_manager.c
+++ b/src/core/lib/iomgr/timer_manager.c
@@ -83,7 +83,7 @@ static void start_timer_thread_and_unlock(void) {
   }
   gpr_thd_options opt = gpr_thd_options_default();
   gpr_thd_options_set_joinable(&opt);
-  completed_thread *ct = gpr_malloc(sizeof(*ct));
+  completed_thread *ct = (completed_thread *)gpr_malloc(sizeof(*ct));
   // The call to gpr_thd_new() has to be under the same lock used by
   // gc_completed_threads(), particularly due to ct->t, which is written here
   // (internally by gpr_thd_new) and read there. Otherwise it's possible for ct
diff --git a/src/core/lib/iomgr/udp_server.c b/src/core/lib/iomgr/udp_server.c
index 88fa34cb7a..9a02c1d1bb 100644
--- a/src/core/lib/iomgr/udp_server.c
+++ b/src/core/lib/iomgr/udp_server.c
@@ -125,7 +125,7 @@ static grpc_socket_factory *get_socket_factory(const grpc_channel_args *args) {
 }
 
 grpc_udp_server *grpc_udp_server_create(const grpc_channel_args *args) {
-  grpc_udp_server *s = gpr_malloc(sizeof(grpc_udp_server));
+  grpc_udp_server *s = (grpc_udp_server *)gpr_malloc(sizeof(grpc_udp_server));
   gpr_mu_init(&s->mu);
   s->socket_factory = get_socket_factory(args);
   if (s->socket_factory) {
@@ -176,7 +176,7 @@ static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) {
 
 static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server,
                            grpc_error *error) {
-  grpc_udp_server *s = server;
+  grpc_udp_server *s = (grpc_udp_server *)server;
   gpr_mu_lock(&s->mu);
   s->destroyed_ports++;
   if (s->destroyed_ports == s->nports) {
@@ -237,7 +237,8 @@ void grpc_udp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
   if (s->active_ports) {
     for (sp = s->head; sp; sp = sp->next) {
       GPR_ASSERT(sp->orphan_cb);
-      struct shutdown_fd_args *args = gpr_malloc(sizeof(*args));
+      struct shutdown_fd_args *args =
+          (struct shutdown_fd_args *)gpr_malloc(sizeof(*args));
       args->fd = sp->emfd;
       args->server_mu = &s->mu;
       GRPC_CLOSURE_INIT(&sp->orphan_fd_closure, shutdown_fd, args,
@@ -331,7 +332,7 @@ error:
 
 /* event manager callback when reads are ready */
 static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  grpc_udp_listener *sp = arg;
+  grpc_udp_listener *sp = (grpc_udp_listener *)arg;
 
   gpr_mu_lock(&sp->server->mu);
   if (error != GRPC_ERROR_NONE) {
@@ -354,7 +355,7 @@ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
 }
 
 static void on_write(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  grpc_udp_listener *sp = arg;
+  grpc_udp_listener *sp = (grpc_udp_listener *)arg;
 
   gpr_mu_lock(&(sp->server->mu));
   if (error != GRPC_ERROR_NONE) {
@@ -393,7 +394,7 @@ static int add_socket_to_server(grpc_udp_server *s, int fd,
     gpr_free(addr_str);
     gpr_mu_lock(&s->mu);
     s->nports++;
-    sp = gpr_malloc(sizeof(grpc_udp_listener));
+    sp = (grpc_udp_listener *)gpr_malloc(sizeof(grpc_udp_listener));
     sp->next = NULL;
     if (s->head == NULL) {
       s->head = sp;
@@ -444,7 +445,8 @@ int grpc_udp_server_add_port(grpc_udp_server *s,
                            (socklen_t *)&sockname_temp.len)) {
         port = grpc_sockaddr_get_port(&sockname_temp);
         if (port > 0) {
-          allocated_addr = gpr_malloc(sizeof(grpc_resolved_address));
+          allocated_addr = (grpc_resolved_address *)gpr_malloc(
+              sizeof(grpc_resolved_address));
           memcpy(allocated_addr, addr, sizeof(grpc_resolved_address));
           grpc_sockaddr_set_port(allocated_addr, port);
           addr = allocated_addr;
diff --git a/src/core/lib/iomgr/unix_sockets_posix.c b/src/core/lib/iomgr/unix_sockets_posix.c
index 0c8627c8c6..35f898f13a 100644
--- a/src/core/lib/iomgr/unix_sockets_posix.c
+++ b/src/core/lib/iomgr/unix_sockets_posix.c
@@ -49,9 +49,11 @@ grpc_error *grpc_resolve_unix_domain_address(const char *name,
     gpr_free(err_msg);
     return err;
   }
-  *addrs = gpr_malloc(sizeof(grpc_resolved_addresses));
+  *addrs =
+      (grpc_resolved_addresses *)gpr_malloc(sizeof(grpc_resolved_addresses));
   (*addrs)->naddrs = 1;
-  (*addrs)->addrs = gpr_malloc(sizeof(grpc_resolved_address));
+  (*addrs)->addrs =
+      (grpc_resolved_address *)gpr_malloc(sizeof(grpc_resolved_address));
   un = (struct sockaddr_un *)(*addrs)->addrs->addr;
   un->sun_family = AF_UNIX;
   strcpy(un->sun_path, name);
diff --git a/src/core/lib/iomgr/wakeup_fd_cv.c b/src/core/lib/iomgr/wakeup_fd_cv.c
index 075a0b6426..5e0b1d1704 100644
--- a/src/core/lib/iomgr/wakeup_fd_cv.c
+++ b/src/core/lib/iomgr/wakeup_fd_cv.c
@@ -42,7 +42,8 @@ static grpc_error* cv_fd_init(grpc_wakeup_fd* fd_info) {
   gpr_mu_lock(&g_cvfds.mu);
   if (!g_cvfds.free_fds) {
     newsize = GPR_MIN(g_cvfds.size * 2, g_cvfds.size + MAX_TABLE_RESIZE);
-    g_cvfds.cvfds = gpr_realloc(g_cvfds.cvfds, sizeof(fd_node) * newsize);
+    g_cvfds.cvfds =
+        (fd_node*)gpr_realloc(g_cvfds.cvfds, sizeof(fd_node) * newsize);
     for (i = g_cvfds.size; i < newsize; i++) {
       g_cvfds.cvfds[i].is_set = 0;
       g_cvfds.cvfds[i].cvs = NULL;
diff --git a/src/core/lib/json/json.c b/src/core/lib/json/json.c
index 25eee05532..4ad51f662a 100644
--- a/src/core/lib/json/json.c
+++ b/src/core/lib/json/json.c
@@ -23,7 +23,7 @@
 #include "src/core/lib/json/json.h"
 
 grpc_json* grpc_json_create(grpc_json_type type) {
-  grpc_json* json = gpr_zalloc(sizeof(*json));
+  grpc_json* json = (grpc_json*)gpr_zalloc(sizeof(*json));
   json->type = type;
 
   return json;
diff --git a/src/core/lib/json/json_string.c b/src/core/lib/json/json_string.c
index 65b5f0f482..3178d2d2b4 100644
--- a/src/core/lib/json/json_string.c
+++ b/src/core/lib/json/json_string.c
@@ -63,19 +63,19 @@ typedef struct {
  * bytes at a time (or multiples thereof).
  */
 static void json_writer_output_check(void *userdata, size_t needed) {
-  json_writer_userdata *state = userdata;
+  json_writer_userdata *state = (json_writer_userdata *)userdata;
   if (state->free_space >= needed) return;
   needed -= state->free_space;
   /* Round up by 256 bytes. */
   needed = (needed + 0xff) & ~0xffU;
-  state->output = gpr_realloc(state->output, state->allocated + needed);
+  state->output = (char *)gpr_realloc(state->output, state->allocated + needed);
   state->free_space += needed;
   state->allocated += needed;
 }
 
 /* These are needed by the writer's implementation. */
 static void json_writer_output_char(void *userdata, char c) {
-  json_writer_userdata *state = userdata;
+  json_writer_userdata *state = (json_writer_userdata *)userdata;
   json_writer_output_check(userdata, 1);
   state->output[state->string_len++] = c;
   state->free_space--;
@@ -83,7 +83,7 @@ static void json_writer_output_char(void *userdata, char c) {
 
 static void json_writer_output_string_with_len(void *userdata, const char *str,
                                                size_t len) {
-  json_writer_userdata *state = userdata;
+  json_writer_userdata *state = (json_writer_userdata *)userdata;
   json_writer_output_check(userdata, len);
   memcpy(state->output + state->string_len, str, len);
   state->string_len += len;
@@ -99,7 +99,7 @@ static void json_writer_output_string(void *userdata, const char *str) {
  * the end of the current string, and advance our output pointer.
  */
 static void json_reader_string_clear(void *userdata) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   if (state->string) {
     GPR_ASSERT(state->string_ptr < state->input);
     *state->string_ptr++ = 0;
@@ -108,7 +108,7 @@ static void json_reader_string_clear(void *userdata) {
 }
 
 static void json_reader_string_add_char(void *userdata, uint32_t c) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   GPR_ASSERT(state->string_ptr < state->input);
   GPR_ASSERT(c <= 0xff);
   *state->string_ptr++ = (uint8_t)c;
@@ -149,7 +149,7 @@ static void json_reader_string_add_utf32(void *userdata, uint32_t c) {
  */
 static uint32_t json_reader_read_char(void *userdata) {
   uint32_t r;
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
 
   if (state->remaining_input == 0) return GRPC_JSON_READ_CHAR_EOF;
 
@@ -168,7 +168,7 @@ static uint32_t json_reader_read_char(void *userdata) {
  * our tree-in-progress inside our opaque structure.
  */
 static grpc_json *json_create_and_link(void *userdata, grpc_json_type type) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   grpc_json *json = grpc_json_create(type);
 
   json->parent = state->current_container;
@@ -194,7 +194,7 @@ static grpc_json *json_create_and_link(void *userdata, grpc_json_type type) {
 }
 
 static void json_reader_container_begins(void *userdata, grpc_json_type type) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   grpc_json *container;
 
   GPR_ASSERT(type == GRPC_JSON_ARRAY || type == GRPC_JSON_OBJECT);
@@ -215,7 +215,7 @@ static void json_reader_container_begins(void *userdata, grpc_json_type type) {
  */
 static grpc_json_type json_reader_container_ends(void *userdata) {
   grpc_json_type container_type = GRPC_JSON_TOP_LEVEL;
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
 
   GPR_ASSERT(state->current_container);
 
@@ -236,18 +236,18 @@ static grpc_json_type json_reader_container_ends(void *userdata) {
  * We'll keep it as a string, and leave it to the caller to evaluate it.
  */
 static void json_reader_set_key(void *userdata) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   state->key = state->string;
 }
 
 static void json_reader_set_string(void *userdata) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   grpc_json *json = json_create_and_link(userdata, GRPC_JSON_STRING);
   json->value = (char *)state->string;
 }
 
 static int json_reader_set_number(void *userdata) {
-  json_reader_userdata *state = userdata;
+  json_reader_userdata *state = (json_reader_userdata *)userdata;
   grpc_json *json = json_create_and_link(userdata, GRPC_JSON_NUMBER);
   json->value = (char *)state->string;
   return 1;
diff --git a/src/core/lib/slice/b64.c b/src/core/lib/slice/b64.c
index d02f303bdb..50264719a4 100644
--- a/src/core/lib/slice/b64.c
+++ b/src/core/lib/slice/b64.c
@@ -58,7 +58,7 @@ char *grpc_base64_encode(const void *vdata, size_t data_size, int url_safe,
                          int multiline) {
   size_t result_projected_size =
       grpc_base64_estimate_encoded_size(data_size, url_safe, multiline);
-  char *result = gpr_malloc(result_projected_size);
+  char *result = (char *)gpr_malloc(result_projected_size);
   grpc_base64_encode_core(result, vdata, data_size, url_safe, multiline);
   return result;
 }
@@ -75,7 +75,7 @@ size_t grpc_base64_estimate_encoded_size(size_t data_size, int url_safe,
 
 void grpc_base64_encode_core(char *result, const void *vdata, size_t data_size,
                              int url_safe, int multiline) {
-  const unsigned char *data = vdata;
+  const unsigned char *data = (const unsigned char *)vdata;
   const char *base64_chars =
       url_safe ? base64_url_safe_chars : base64_url_unsafe_chars;
   const size_t result_projected_size =
diff --git a/src/core/lib/slice/slice.c b/src/core/lib/slice/slice.c
index 8a8087805c..321a21a10b 100644
--- a/src/core/lib/slice/slice.c
+++ b/src/core/lib/slice/slice.c
@@ -27,7 +27,7 @@
 #include "src/core/lib/iomgr/exec_ctx.h"
 
 char *grpc_slice_to_c_string(grpc_slice slice) {
-  char *out = gpr_malloc(GRPC_SLICE_LENGTH(slice) + 1);
+  char *out = (char *)gpr_malloc(GRPC_SLICE_LENGTH(slice) + 1);
   memcpy(out, GRPC_SLICE_START_PTR(slice), GRPC_SLICE_LENGTH(slice));
   out[GRPC_SLICE_LENGTH(slice)] = 0;
   return out;
@@ -105,12 +105,12 @@ typedef struct new_slice_refcount {
 } new_slice_refcount;
 
 static void new_slice_ref(void *p) {
-  new_slice_refcount *r = p;
+  new_slice_refcount *r = (new_slice_refcount *)p;
   gpr_ref(&r->refs);
 }
 
 static void new_slice_unref(grpc_exec_ctx *exec_ctx, void *p) {
-  new_slice_refcount *r = p;
+  new_slice_refcount *r = (new_slice_refcount *)p;
   if (gpr_unref(&r->refs)) {
     r->user_destroy(r->user_data);
     gpr_free(r);
@@ -125,7 +125,8 @@ grpc_slice grpc_slice_new_with_user_data(void *p, size_t len,
                                          void (*destroy)(void *),
                                          void *user_data) {
   grpc_slice slice;
-  new_slice_refcount *rc = gpr_malloc(sizeof(new_slice_refcount));
+  new_slice_refcount *rc =
+      (new_slice_refcount *)gpr_malloc(sizeof(new_slice_refcount));
   gpr_ref_init(&rc->refs, 1);
   rc->rc.vtable = &new_slice_vtable;
   rc->rc.sub_refcount = &rc->rc;
@@ -133,7 +134,7 @@ grpc_slice grpc_slice_new_with_user_data(void *p, size_t len,
   rc->user_data = user_data;
 
   slice.refcount = &rc->rc;
-  slice.data.refcounted.bytes = p;
+  slice.data.refcounted.bytes = (uint8_t *)p;
   slice.data.refcounted.length = len;
   return slice;
 }
@@ -154,12 +155,12 @@ typedef struct new_with_len_slice_refcount {
 } new_with_len_slice_refcount;
 
 static void new_with_len_ref(void *p) {
-  new_with_len_slice_refcount *r = p;
+  new_with_len_slice_refcount *r = (new_with_len_slice_refcount *)p;
   gpr_ref(&r->refs);
 }
 
 static void new_with_len_unref(grpc_exec_ctx *exec_ctx, void *p) {
-  new_with_len_slice_refcount *r = p;
+  new_with_len_slice_refcount *r = (new_with_len_slice_refcount *)p;
   if (gpr_unref(&r->refs)) {
     r->user_destroy(r->user_data, r->user_length);
     gpr_free(r);
@@ -183,7 +184,7 @@ grpc_slice grpc_slice_new_with_len(void *p, size_t len,
   rc->user_length = len;
 
   slice.refcount = &rc->rc;
-  slice.data.refcounted.bytes = p;
+  slice.data.refcounted.bytes = (uint8_t *)p;
   slice.data.refcounted.length = len;
   return slice;
 }
@@ -205,12 +206,12 @@ typedef struct {
 } malloc_refcount;
 
 static void malloc_ref(void *p) {
-  malloc_refcount *r = p;
+  malloc_refcount *r = (malloc_refcount *)p;
   gpr_ref(&r->refs);
 }
 
 static void malloc_unref(grpc_exec_ctx *exec_ctx, void *p) {
-  malloc_refcount *r = p;
+  malloc_refcount *r = (malloc_refcount *)p;
   if (gpr_unref(&r->refs)) {
     gpr_free(r);
   }
@@ -232,7 +233,8 @@ grpc_slice grpc_slice_malloc_large(size_t length) {
      refcount is a malloc_refcount
      bytes is an array of bytes of the requested length
      Both parts are placed in the same allocation returned from gpr_malloc */
-  malloc_refcount *rc = gpr_malloc(sizeof(malloc_refcount) + length);
+  malloc_refcount *rc =
+      (malloc_refcount *)gpr_malloc(sizeof(malloc_refcount) + length);
 
   /* Initial refcount on rc is 1 - and it's up to the caller to release
      this reference. */
@@ -451,7 +453,7 @@ int grpc_slice_rchr(grpc_slice s, char c) {
 
 int grpc_slice_chr(grpc_slice s, char c) {
   const char *b = (const char *)GRPC_SLICE_START_PTR(s);
-  const char *p = memchr(b, c, GRPC_SLICE_LENGTH(s));
+  const char *p = (const char *)memchr(b, c, GRPC_SLICE_LENGTH(s));
   return p == NULL ? -1 : (int)(p - b);
 }
 
diff --git a/src/core/lib/slice/slice_buffer.c b/src/core/lib/slice/slice_buffer.c
index a54a997a0d..63ffc0b00d 100644
--- a/src/core/lib/slice/slice_buffer.c
+++ b/src/core/lib/slice/slice_buffer.c
@@ -45,11 +45,12 @@ static void maybe_embiggen(grpc_slice_buffer *sb) {
       sb->capacity = GROW(sb->capacity);
       GPR_ASSERT(sb->capacity > slice_count);
       if (sb->base_slices == sb->inlined) {
-        sb->base_slices = gpr_malloc(sb->capacity * sizeof(grpc_slice));
+        sb->base_slices =
+            (grpc_slice *)gpr_malloc(sb->capacity * sizeof(grpc_slice));
         memcpy(sb->base_slices, sb->inlined, slice_count * sizeof(grpc_slice));
       } else {
-        sb->base_slices =
-            gpr_realloc(sb->base_slices, sb->capacity * sizeof(grpc_slice));
+        sb->base_slices = (grpc_slice *)gpr_realloc(
+            sb->base_slices, sb->capacity * sizeof(grpc_slice));
       }
 
       sb->slices = sb->base_slices + slice_offset;
@@ -291,7 +292,7 @@ void grpc_slice_buffer_move_first_no_ref(grpc_slice_buffer *src, size_t n,
 void grpc_slice_buffer_move_first_into_buffer(grpc_exec_ctx *exec_ctx,
                                               grpc_slice_buffer *src, size_t n,
                                               void *dst) {
-  char *dstp = dst;
+  char *dstp = (char *)dst;
   GPR_ASSERT(src->length >= n);
 
   while (n > 0) {
diff --git a/src/core/lib/slice/slice_hash_table.c b/src/core/lib/slice/slice_hash_table.c
index 1866ed25ac..6c2c9c201c 100644
--- a/src/core/lib/slice/slice_hash_table.c
+++ b/src/core/lib/slice/slice_hash_table.c
@@ -60,14 +60,15 @@ grpc_slice_hash_table* grpc_slice_hash_table_create(
     size_t num_entries, grpc_slice_hash_table_entry* entries,
     void (*destroy_value)(grpc_exec_ctx* exec_ctx, void* value),
     int (*value_cmp)(void* a, void* b)) {
-  grpc_slice_hash_table* table = gpr_zalloc(sizeof(*table));
+  grpc_slice_hash_table* table =
+      (grpc_slice_hash_table*)gpr_zalloc(sizeof(*table));
   gpr_ref_init(&table->refs, 1);
   table->destroy_value = destroy_value;
   table->value_cmp = value_cmp;
   // Keep load factor low to improve performance of lookups.
   table->size = num_entries * 2;
   const size_t entry_size = sizeof(grpc_slice_hash_table_entry) * table->size;
-  table->entries = gpr_zalloc(entry_size);
+  table->entries = (grpc_slice_hash_table_entry*)gpr_zalloc(entry_size);
   for (size_t i = 0; i < num_entries; ++i) {
     grpc_slice_hash_table_entry* entry = &entries[i];
     grpc_slice_hash_table_add(table, entry->key, entry->value);
diff --git a/src/core/lib/slice/slice_intern.c b/src/core/lib/slice/slice_intern.c
index a6d22c1e1f..ec71b3ca1d 100644
--- a/src/core/lib/slice/slice_intern.c
+++ b/src/core/lib/slice/slice_intern.c
@@ -69,7 +69,7 @@ static uint32_t max_static_metadata_hash_probe;
 static uint32_t static_metadata_hash_values[GRPC_STATIC_MDSTR_COUNT];
 
 static void interned_slice_ref(void *p) {
-  interned_slice_refcount *s = p;
+  interned_slice_refcount *s = (interned_slice_refcount *)p;
   GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&s->refcnt, 1) > 0);
 }
 
@@ -90,7 +90,7 @@ static void interned_slice_destroy(interned_slice_refcount *s) {
 }
 
 static void interned_slice_unref(grpc_exec_ctx *exec_ctx, void *p) {
-  interned_slice_refcount *s = p;
+  interned_slice_refcount *s = (interned_slice_refcount *)p;
   if (1 == gpr_atm_full_fetch_add(&s->refcnt, -1)) {
     interned_slice_destroy(s);
   }
@@ -129,7 +129,8 @@ static void grow_shard(slice_shard *shard) {
 
   GPR_TIMER_BEGIN("grow_strtab", 0);
 
-  strtab = gpr_zalloc(sizeof(interned_slice_refcount *) * capacity);
+  strtab = (interned_slice_refcount **)gpr_zalloc(
+      sizeof(interned_slice_refcount *) * capacity);
 
   for (i = 0; i < shard->capacity; i++) {
     for (s = shard->strs[i]; s; s = next) {
@@ -242,7 +243,8 @@ grpc_slice grpc_slice_intern(grpc_slice slice) {
 
   /* not found: create a new string */
   /* string data goes after the internal_string header */
-  s = gpr_malloc(sizeof(*s) + GRPC_SLICE_LENGTH(slice));
+  s = (interned_slice_refcount *)gpr_malloc(sizeof(*s) +
+                                            GRPC_SLICE_LENGTH(slice));
   gpr_atm_rel_store(&s->refcnt, 1);
   s->length = GRPC_SLICE_LENGTH(slice);
   s->hash = hash;
@@ -280,7 +282,8 @@ void grpc_slice_intern_init(void) {
     gpr_mu_init(&shard->mu);
     shard->count = 0;
     shard->capacity = INITIAL_SHARD_CAPACITY;
-    shard->strs = gpr_zalloc(sizeof(*shard->strs) * shard->capacity);
+    shard->strs = (interned_slice_refcount **)gpr_zalloc(sizeof(*shard->strs) *
+                                                         shard->capacity);
   }
   for (size_t i = 0; i < GPR_ARRAY_SIZE(static_metadata_hash); i++) {
     static_metadata_hash[i].hash = 0;
diff --git a/src/core/lib/surface/alarm.c b/src/core/lib/surface/alarm.c
index 5dbfaa2d43..7712f560b9 100644
--- a/src/core/lib/surface/alarm.c
+++ b/src/core/lib/surface/alarm.c
@@ -80,12 +80,12 @@ static void alarm_unref_dbg(grpc_alarm *alarm, const char *reason,
 
 static void alarm_end_completion(grpc_exec_ctx *exec_ctx, void *arg,
                                  grpc_cq_completion *c) {
-  grpc_alarm *alarm = arg;
+  grpc_alarm *alarm = (grpc_alarm *)arg;
   GRPC_ALARM_UNREF(alarm, "dequeue-end-op");
 }
 
 static void alarm_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  grpc_alarm *alarm = arg;
+  grpc_alarm *alarm = (grpc_alarm *)arg;
 
   /* We are queuing an op on completion queue. This means, the alarm's structure
      cannot be destroyed until the op is dequeued. Adding an extra ref
@@ -96,7 +96,7 @@ static void alarm_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
 }
 
 grpc_alarm *grpc_alarm_create(void *reserved) {
-  grpc_alarm *alarm = gpr_malloc(sizeof(grpc_alarm));
+  grpc_alarm *alarm = (grpc_alarm *)gpr_malloc(sizeof(grpc_alarm));
 
 #ifndef NDEBUG
   if (GRPC_TRACER_ON(grpc_trace_alarm_refcount)) {
diff --git a/src/core/lib/surface/byte_buffer.c b/src/core/lib/surface/byte_buffer.c
index 0bc990d487..7ed550ef87 100644
--- a/src/core/lib/surface/byte_buffer.c
+++ b/src/core/lib/surface/byte_buffer.c
@@ -32,7 +32,8 @@ grpc_byte_buffer *grpc_raw_compressed_byte_buffer_create(
     grpc_slice *slices, size_t nslices,
     grpc_compression_algorithm compression) {
   size_t i;
-  grpc_byte_buffer *bb = gpr_malloc(sizeof(grpc_byte_buffer));
+  grpc_byte_buffer *bb =
+      (grpc_byte_buffer *)gpr_malloc(sizeof(grpc_byte_buffer));
   bb->type = GRPC_BB_RAW;
   bb->data.raw.compression = compression;
   grpc_slice_buffer_init(&bb->data.raw.slice_buffer);
@@ -45,7 +46,8 @@ grpc_byte_buffer *grpc_raw_compressed_byte_buffer_create(
 
 grpc_byte_buffer *grpc_raw_byte_buffer_from_reader(
     grpc_byte_buffer_reader *reader) {
-  grpc_byte_buffer *bb = gpr_malloc(sizeof(grpc_byte_buffer));
+  grpc_byte_buffer *bb =
+      (grpc_byte_buffer *)gpr_malloc(sizeof(grpc_byte_buffer));
   grpc_slice slice;
   bb->type = GRPC_BB_RAW;
   bb->data.raw.compression = GRPC_COMPRESS_NONE;
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index 3aa20ffcd7..93c512df69 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -307,7 +307,7 @@ void *grpc_call_arena_alloc(grpc_call *call, size_t size) {
 static parent_call *get_or_create_parent_call(grpc_call *call) {
   parent_call *p = (parent_call *)gpr_atm_acq_load(&call->parent_call_atm);
   if (p == NULL) {
-    p = gpr_arena_alloc(call->arena, sizeof(*p));
+    p = (parent_call *)gpr_arena_alloc(call->arena, sizeof(*p));
     gpr_mu_init(&p->child_list_mu);
     if (!gpr_atm_rel_cas(&call->parent_call_atm, (gpr_atm)NULL, (gpr_atm)p)) {
       gpr_mu_destroy(&p->child_list_mu);
@@ -332,8 +332,8 @@ grpc_error *grpc_call_create(grpc_exec_ctx *exec_ctx,
   GPR_TIMER_BEGIN("grpc_call_create", 0);
   gpr_arena *arena =
       gpr_arena_create(grpc_channel_get_call_size_estimate(args->channel));
-  call = gpr_arena_alloc(arena,
-                         sizeof(grpc_call) + channel_stack->call_stack_size);
+  call = (grpc_call *)gpr_arena_alloc(
+      arena, sizeof(grpc_call) + channel_stack->call_stack_size);
   gpr_ref_init(&call->ext_ref, 1);
   call->arena = arena;
   grpc_call_combiner_init(&call->call_combiner);
@@ -511,7 +511,7 @@ void grpc_call_internal_unref(grpc_exec_ctx *exec_ctx, grpc_call *c REF_ARG) {
 
 static void release_call(grpc_exec_ctx *exec_ctx, void *call,
                          grpc_error *error) {
-  grpc_call *c = call;
+  grpc_call *c = (grpc_call *)call;
   grpc_channel *channel = c->channel;
   grpc_call_combiner_destroy(&c->call_combiner);
   gpr_free((char *)c->peer_string);
@@ -524,7 +524,7 @@ static void destroy_call(grpc_exec_ctx *exec_ctx, void *call,
                          grpc_error *error) {
   size_t i;
   int ii;
-  grpc_call *c = call;
+  grpc_call *c = (grpc_call *)call;
   GPR_TIMER_BEGIN("destroy_call", 0);
   for (i = 0; i < 2; i++) {
     grpc_metadata_batch_destroy(
@@ -624,8 +624,8 @@ grpc_call_error grpc_call_cancel(grpc_call *call, void *reserved) {
 // the filter stack.
 static void execute_batch_in_call_combiner(grpc_exec_ctx *exec_ctx, void *arg,
                                            grpc_error *ignored) {
-  grpc_transport_stream_op_batch *batch = arg;
-  grpc_call *call = batch->handler_private.extra_arg;
+  grpc_transport_stream_op_batch *batch = (grpc_transport_stream_op_batch *)arg;
+  grpc_call *call = (grpc_call *)batch->handler_private.extra_arg;
   GPR_TIMER_BEGIN("execute_batch", 0);
   grpc_call_element *elem = CALL_ELEM_FROM_CALL(call, 0);
   GRPC_CALL_LOG_OP(GPR_INFO, elem, batch);
@@ -1105,8 +1105,8 @@ static void publish_app_metadata(grpc_call *call, grpc_metadata_batch *b,
   if (dest->count + b->list.count > dest->capacity) {
     dest->capacity =
         GPR_MAX(dest->capacity + b->list.count, dest->capacity * 3 / 2);
-    dest->metadata =
-        gpr_realloc(dest->metadata, sizeof(grpc_metadata) * dest->capacity);
+    dest->metadata = (grpc_metadata *)gpr_realloc(
+        dest->metadata, sizeof(grpc_metadata) * dest->capacity);
   }
   for (grpc_linked_mdelem *l = b->list.head; l != NULL; l = l->next) {
     mdusr = &dest->metadata[dest->count++];
@@ -1157,7 +1157,7 @@ static void recv_initial_filter(grpc_exec_ctx *exec_ctx, grpc_call *call,
 
 static void recv_trailing_filter(grpc_exec_ctx *exec_ctx, void *args,
                                  grpc_metadata_batch *b) {
-  grpc_call *call = args;
+  grpc_call *call = (grpc_call *)args;
   if (b->idx.named.grpc_status != NULL) {
     uint32_t status_code = decode_status(b->idx.named.grpc_status->md);
     grpc_error *error =
@@ -1241,7 +1241,8 @@ static batch_control *allocate_batch_control(grpc_call *call,
   int slot = batch_slot_for_op(ops[0].op);
   batch_control **pslot = &call->active_batches[slot];
   if (*pslot == NULL) {
-    *pslot = gpr_arena_alloc(call->arena, sizeof(batch_control));
+    *pslot =
+        (batch_control *)gpr_arena_alloc(call->arena, sizeof(batch_control));
   }
   batch_control *bctl = *pslot;
   if (bctl->call != NULL) {
@@ -1255,7 +1256,7 @@ static batch_control *allocate_batch_control(grpc_call *call,
 
 static void finish_batch_completion(grpc_exec_ctx *exec_ctx, void *user_data,
                                     grpc_cq_completion *storage) {
-  batch_control *bctl = user_data;
+  batch_control *bctl = (batch_control *)user_data;
   grpc_call *call = bctl->call;
   bctl->call = NULL;
   GRPC_CALL_INTERNAL_UNREF(exec_ctx, call, "completion");
@@ -1398,7 +1399,7 @@ static void continue_receiving_slices(grpc_exec_ctx *exec_ctx,
 
 static void receiving_slice_ready(grpc_exec_ctx *exec_ctx, void *bctlp,
                                   grpc_error *error) {
-  batch_control *bctl = bctlp;
+  batch_control *bctl = (batch_control *)bctlp;
   grpc_call *call = bctl->call;
   grpc_byte_stream *bs = call->receiving_stream;
   bool release_error = false;
@@ -1457,7 +1458,7 @@ static void process_data_after_md(grpc_exec_ctx *exec_ctx,
 
 static void receiving_stream_ready(grpc_exec_ctx *exec_ctx, void *bctlp,
                                    grpc_error *error) {
-  batch_control *bctl = bctlp;
+  batch_control *bctl = (batch_control *)bctlp;
   grpc_call *call = bctl->call;
   if (error != GRPC_ERROR_NONE) {
     if (call->receiving_stream != NULL) {
@@ -1483,7 +1484,7 @@ static void receiving_stream_ready(grpc_exec_ctx *exec_ctx, void *bctlp,
 static void receiving_stream_ready_in_call_combiner(grpc_exec_ctx *exec_ctx,
                                                     void *bctlp,
                                                     grpc_error *error) {
-  batch_control *bctl = bctlp;
+  batch_control *bctl = (batch_control *)bctlp;
   grpc_call *call = bctl->call;
   GRPC_CALL_COMBINER_STOP(exec_ctx, &call->call_combiner, "recv_message_ready");
   receiving_stream_ready(exec_ctx, bctlp, error);
@@ -1592,7 +1593,7 @@ static void add_batch_error(grpc_exec_ctx *exec_ctx, batch_control *bctl,
 
 static void receiving_initial_metadata_ready(grpc_exec_ctx *exec_ctx,
                                              void *bctlp, grpc_error *error) {
-  batch_control *bctl = bctlp;
+  batch_control *bctl = (batch_control *)bctlp;
   grpc_call *call = bctl->call;
 
   GRPC_CALL_COMBINER_STOP(exec_ctx, &call->call_combiner,
@@ -1650,7 +1651,7 @@ static void receiving_initial_metadata_ready(grpc_exec_ctx *exec_ctx,
 
 static void finish_batch(grpc_exec_ctx *exec_ctx, void *bctlp,
                          grpc_error *error) {
-  batch_control *bctl = bctlp;
+  batch_control *bctl = (batch_control *)bctlp;
   grpc_call *call = bctl->call;
   GRPC_CALL_COMBINER_STOP(exec_ctx, &call->call_combiner, "on_complete");
   add_batch_error(exec_ctx, bctl, GRPC_ERROR_REF(error), false);
diff --git a/src/core/lib/surface/channel.c b/src/core/lib/surface/channel.c
index 850fbe6a69..34548dac26 100644
--- a/src/core/lib/surface/channel.c
+++ b/src/core/lib/surface/channel.c
@@ -327,7 +327,7 @@ grpc_call *grpc_channel_create_pollset_set_call(
 
 void *grpc_channel_register_call(grpc_channel *channel, const char *method,
                                  const char *host, void *reserved) {
-  registered_call *rc = gpr_malloc(sizeof(registered_call));
+  registered_call *rc = (registered_call *)gpr_malloc(sizeof(registered_call));
   GRPC_API_TRACE(
       "grpc_channel_register_call(channel=%p, method=%s, host=%s, reserved=%p)",
       4, (channel, method, host, reserved));
@@ -354,7 +354,7 @@ grpc_call *grpc_channel_create_registered_call(
     grpc_channel *channel, grpc_call *parent_call, uint32_t propagation_mask,
     grpc_completion_queue *completion_queue, void *registered_call_handle,
     gpr_timespec deadline, void *reserved) {
-  registered_call *rc = registered_call_handle;
+  registered_call *rc = (registered_call *)registered_call_handle;
   GRPC_API_TRACE(
       "grpc_channel_create_registered_call("
       "channel=%p, parent_call=%p, propagation_mask=%x, completion_queue=%p, "
@@ -392,7 +392,7 @@ void grpc_channel_internal_unref(grpc_exec_ctx *exec_ctx,
 
 static void destroy_channel(grpc_exec_ctx *exec_ctx, void *arg,
                             grpc_error *error) {
-  grpc_channel *channel = arg;
+  grpc_channel *channel = (grpc_channel *)arg;
   grpc_channel_stack_destroy(exec_ctx, CHANNEL_STACK_FROM_CHANNEL(channel));
   while (channel->registered_calls) {
     registered_call *rc = channel->registered_calls;
diff --git a/src/core/lib/surface/channel_init.c b/src/core/lib/surface/channel_init.c
index a1391ffe56..33f444b89e 100644
--- a/src/core/lib/surface/channel_init.c
+++ b/src/core/lib/surface/channel_init.c
@@ -53,9 +53,9 @@ void grpc_channel_init_register_stage(grpc_channel_stack_type type,
   GPR_ASSERT(!g_finalized);
   if (g_slots[type].cap_slots == g_slots[type].num_slots) {
     g_slots[type].cap_slots = GPR_MAX(8, 3 * g_slots[type].cap_slots / 2);
-    g_slots[type].slots =
-        gpr_realloc(g_slots[type].slots,
-                    g_slots[type].cap_slots * sizeof(*g_slots[type].slots));
+    g_slots[type].slots = (stage_slot *)gpr_realloc(
+        g_slots[type].slots,
+        g_slots[type].cap_slots * sizeof(*g_slots[type].slots));
   }
   stage_slot *s = &g_slots[type].slots[g_slots[type].num_slots++];
   s->insertion_order = g_slots[type].num_slots;
@@ -65,8 +65,8 @@ void grpc_channel_init_register_stage(grpc_channel_stack_type type,
 }
 
 static int compare_slots(const void *a, const void *b) {
-  const stage_slot *sa = a;
-  const stage_slot *sb = b;
+  const stage_slot *sa = (const stage_slot *)a;
+  const stage_slot *sb = (const stage_slot *)b;
 
   int c = GPR_ICMP(sa->priority, sb->priority);
   if (c != 0) return c;
@@ -85,7 +85,7 @@ void grpc_channel_init_finalize(void) {
 void grpc_channel_init_shutdown(void) {
   for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) {
     gpr_free(g_slots[i].slots);
-    g_slots[i].slots = (void *)(uintptr_t)0xdeadbeef;
+    g_slots[i].slots = (stage_slot *)(void *)(uintptr_t)0xdeadbeef;
   }
 }
 
diff --git a/src/core/lib/surface/channel_ping.c b/src/core/lib/surface/channel_ping.c
index e85b308850..f45b568958 100644
--- a/src/core/lib/surface/channel_ping.c
+++ b/src/core/lib/surface/channel_ping.c
@@ -39,7 +39,7 @@ static void ping_destroy(grpc_exec_ctx *exec_ctx, void *arg,
 }
 
 static void ping_done(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
-  ping_result *pr = arg;
+  ping_result *pr = (ping_result *)arg;
   grpc_cq_end_op(exec_ctx, pr->cq, pr->tag, GRPC_ERROR_REF(error), ping_destroy,
                  pr, &pr->completion_storage);
 }
@@ -49,7 +49,7 @@ void grpc_channel_ping(grpc_channel *channel, grpc_completion_queue *cq,
   GRPC_API_TRACE("grpc_channel_ping(channel=%p, cq=%p, tag=%p, reserved=%p)", 4,
                  (channel, cq, tag, reserved));
   grpc_transport_op *op = grpc_make_transport_op(NULL);
-  ping_result *pr = gpr_malloc(sizeof(*pr));
+  ping_result *pr = (ping_result *)gpr_malloc(sizeof(*pr));
   grpc_channel_element *top_elem =
       grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
diff --git a/src/core/lib/surface/completion_queue.c b/src/core/lib/surface/completion_queue.c
index 10e4e5ab0c..4726503994 100644
--- a/src/core/lib/surface/completion_queue.c
+++ b/src/core/lib/surface/completion_queue.c
@@ -420,8 +420,9 @@ grpc_completion_queue *grpc_completion_queue_create_internal(
   const cq_poller_vtable *poller_vtable =
       &g_poller_vtable_by_poller_type[polling_type];
 
-  cq = gpr_zalloc(sizeof(grpc_completion_queue) + vtable->data_size +
-                  poller_vtable->size());
+  cq = (grpc_completion_queue *)gpr_zalloc(sizeof(grpc_completion_queue) +
+                                           vtable->data_size +
+                                           poller_vtable->size());
 
   cq->vtable = vtable;
   cq->poller_vtable = poller_vtable;
@@ -441,7 +442,7 @@ grpc_completion_queue *grpc_completion_queue_create_internal(
 }
 
 static void cq_init_next(void *ptr) {
-  cq_next_data *cqd = ptr;
+  cq_next_data *cqd = (cq_next_data *)ptr;
   /* Initial count is dropped by grpc_completion_queue_shutdown */
   gpr_atm_no_barrier_store(&cqd->pending_events, 1);
   cqd->shutdown_called = false;
@@ -450,13 +451,13 @@ static void cq_init_next(void *ptr) {
 }
 
 static void cq_destroy_next(void *ptr) {
-  cq_next_data *cqd = ptr;
+  cq_next_data *cqd = (cq_next_data *)ptr;
   GPR_ASSERT(cq_event_queue_num_items(&cqd->queue) == 0);
   cq_event_queue_destroy(&cqd->queue);
 }
 
 static void cq_init_pluck(void *ptr) {
-  cq_pluck_data *cqd = ptr;
+  cq_pluck_data *cqd = (cq_pluck_data *)ptr;
   /* Initial count is dropped by grpc_completion_queue_shutdown */
   gpr_atm_no_barrier_store(&cqd->pending_events, 1);
   cqd->completed_tail = &cqd->completed_head;
@@ -468,7 +469,7 @@ static void cq_init_pluck(void *ptr) {
 }
 
 static void cq_destroy_pluck(void *ptr) {
-  cq_pluck_data *cqd = ptr;
+  cq_pluck_data *cqd = (cq_pluck_data *)ptr;
   GPR_ASSERT(cqd->completed_head.next == (uintptr_t)&cqd->completed_head);
 }
 
@@ -501,7 +502,7 @@ void grpc_cq_internal_ref(grpc_completion_queue *cq) {
 
 static void on_pollset_shutdown_done(grpc_exec_ctx *exec_ctx, void *arg,
                                      grpc_error *error) {
-  grpc_completion_queue *cq = arg;
+  grpc_completion_queue *cq = (grpc_completion_queue *)arg;
   GRPC_CQ_INTERNAL_UNREF(exec_ctx, cq, "pollset_destroy");
 }
 
@@ -588,9 +589,9 @@ bool grpc_cq_begin_op(grpc_completion_queue *cq, void *tag) {
   gpr_mu_lock(cq->mu);
   if (cq->outstanding_tag_count == cq->outstanding_tag_capacity) {
     cq->outstanding_tag_capacity = GPR_MAX(4, 2 * cq->outstanding_tag_capacity);
-    cq->outstanding_tags =
-        gpr_realloc(cq->outstanding_tags, sizeof(*cq->outstanding_tags) *
-                                              cq->outstanding_tag_capacity);
+    cq->outstanding_tags = (void **)gpr_realloc(
+        cq->outstanding_tags,
+        sizeof(*cq->outstanding_tags) * cq->outstanding_tag_capacity);
   }
   cq->outstanding_tags[cq->outstanding_tag_count++] = tag;
   gpr_mu_unlock(cq->mu);
@@ -766,7 +767,7 @@ typedef struct {
 } cq_is_finished_arg;
 
 static bool cq_is_next_finished(grpc_exec_ctx *exec_ctx, void *arg) {
-  cq_is_finished_arg *a = arg;
+  cq_is_finished_arg *a = (cq_is_finished_arg *)arg;
   grpc_completion_queue *cq = a->cq;
   cq_next_data *cqd = DATA_FROM_CQ(cq);
   GPR_ASSERT(a->stolen_completion == NULL);
@@ -1017,7 +1018,7 @@ static void del_plucker(grpc_completion_queue *cq, void *tag,
 }
 
 static bool cq_is_pluck_finished(grpc_exec_ctx *exec_ctx, void *arg) {
-  cq_is_finished_arg *a = arg;
+  cq_is_finished_arg *a = (cq_is_finished_arg *)arg;
   grpc_completion_queue *cq = a->cq;
   cq_pluck_data *cqd = DATA_FROM_CQ(cq);
 
diff --git a/src/core/lib/surface/server.c b/src/core/lib/surface/server.c
index c525112496..f95cc10a6a 100644
--- a/src/core/lib/surface/server.c
+++ b/src/core/lib/surface/server.c
@@ -250,7 +250,8 @@ static void channel_broadcaster_init(grpc_server *s, channel_broadcaster *cb) {
     count++;
   }
   cb->num_channels = count;
-  cb->channels = gpr_malloc(sizeof(*cb->channels) * cb->num_channels);
+  cb->channels =
+      (grpc_channel **)gpr_malloc(sizeof(*cb->channels) * cb->num_channels);
   count = 0;
   for (c = s->root_channel_data.next; c != &s->root_channel_data; c = c->next) {
     cb->channels[count++] = c->channel;
@@ -265,14 +266,15 @@ struct shutdown_cleanup_args {
 
 static void shutdown_cleanup(grpc_exec_ctx *exec_ctx, void *arg,
                              grpc_error *error) {
-  struct shutdown_cleanup_args *a = arg;
+  struct shutdown_cleanup_args *a = (struct shutdown_cleanup_args *)arg;
   grpc_slice_unref_internal(exec_ctx, a->slice);
   gpr_free(a);
 }
 
 static void send_shutdown(grpc_exec_ctx *exec_ctx, grpc_channel *channel,
                           bool send_goaway, grpc_error *send_disconnect) {
-  struct shutdown_cleanup_args *sc = gpr_malloc(sizeof(*sc));
+  struct shutdown_cleanup_args *sc =
+      (struct shutdown_cleanup_args *)gpr_malloc(sizeof(*sc));
   GRPC_CLOSURE_INIT(&sc->closure, shutdown_cleanup, sc,
                     grpc_schedule_on_exec_ctx);
   grpc_transport_op *op = grpc_make_transport_op(&sc->closure);
@@ -314,8 +316,8 @@ static void request_matcher_init(request_matcher *rm, size_t entries,
                                  grpc_server *server) {
   memset(rm, 0, sizeof(*rm));
   rm->server = server;
-  rm->requests_per_cq =
-      gpr_malloc(sizeof(*rm->requests_per_cq) * server->cq_count);
+  rm->requests_per_cq = (gpr_stack_lockfree **)gpr_malloc(
+      sizeof(*rm->requests_per_cq) * server->cq_count);
   for (size_t i = 0; i < server->cq_count; i++) {
     rm->requests_per_cq[i] = gpr_stack_lockfree_create(entries);
   }
@@ -426,7 +428,7 @@ static void orphan_channel(channel_data *chand) {
 
 static void finish_destroy_channel(grpc_exec_ctx *exec_ctx, void *cd,
                                    grpc_error *error) {
-  channel_data *chand = cd;
+  channel_data *chand = (channel_data *)cd;
   grpc_server *server = chand->server;
   GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, chand->channel, "server");
   server_unref(exec_ctx, server);
@@ -459,7 +461,7 @@ static void destroy_channel(grpc_exec_ctx *exec_ctx, channel_data *chand,
 
 static void done_request_event(grpc_exec_ctx *exec_ctx, void *req,
                                grpc_cq_completion *c) {
-  requested_call *rc = req;
+  requested_call *rc = (requested_call *)req;
   grpc_server *server = rc->server;
 
   if (rc >= server->requested_calls_per_cq[rc->cq_idx] &&
@@ -505,7 +507,7 @@ static void publish_call(grpc_exec_ctx *exec_ctx, grpc_server *server,
 
   grpc_call_element *elem =
       grpc_call_stack_element(grpc_call_get_call_stack(call), 0);
-  channel_data *chand = elem->channel_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
   server_ref(chand->server);
   grpc_cq_end_op(exec_ctx, calld->cq_new, rc->tag, GRPC_ERROR_NONE,
                  done_request_event, rc, &rc->completion);
@@ -513,9 +515,9 @@ static void publish_call(grpc_exec_ctx *exec_ctx, grpc_server *server,
 
 static void publish_new_rpc(grpc_exec_ctx *exec_ctx, void *arg,
                             grpc_error *error) {
-  grpc_call_element *call_elem = arg;
-  call_data *calld = call_elem->call_data;
-  channel_data *chand = call_elem->channel_data;
+  grpc_call_element *call_elem = (grpc_call_element *)arg;
+  call_data *calld = (call_data *)call_elem->call_data;
+  channel_data *chand = (channel_data *)call_elem->channel_data;
   request_matcher *rm = calld->request_matcher;
   grpc_server *server = rm->server;
 
@@ -566,7 +568,7 @@ static void finish_start_new_rpc(
     grpc_exec_ctx *exec_ctx, grpc_server *server, grpc_call_element *elem,
     request_matcher *rm,
     grpc_server_register_method_payload_handling payload_handling) {
-  call_data *calld = elem->call_data;
+  call_data *calld = (call_data *)elem->call_data;
 
   if (gpr_atm_acq_load(&server->shutdown_flag)) {
     gpr_mu_lock(&calld->mu_state);
@@ -599,8 +601,8 @@ static void finish_start_new_rpc(
 }
 
 static void start_new_rpc(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
-  channel_data *chand = elem->channel_data;
-  call_data *calld = elem->call_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
+  call_data *calld = (call_data *)elem->call_data;
   grpc_server *server = chand->server;
   uint32_t i;
   uint32_t hash;
@@ -732,8 +734,8 @@ static void maybe_finish_shutdown(grpc_exec_ctx *exec_ctx,
 
 static void server_on_recv_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
                                             grpc_error *error) {
-  grpc_call_element *elem = ptr;
-  call_data *calld = elem->call_data;
+  grpc_call_element *elem = (grpc_call_element *)ptr;
+  call_data *calld = (call_data *)elem->call_data;
   gpr_timespec op_deadline;
 
   if (error == GRPC_ERROR_NONE) {
@@ -771,7 +773,7 @@ static void server_on_recv_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
 
 static void server_mutate_op(grpc_call_element *elem,
                              grpc_transport_stream_op_batch *op) {
-  call_data *calld = elem->call_data;
+  call_data *calld = (call_data *)elem->call_data;
 
   if (op->recv_initial_metadata) {
     GPR_ASSERT(op->payload->recv_initial_metadata.recv_flags == NULL);
@@ -795,8 +797,8 @@ static void server_start_transport_stream_op_batch(
 
 static void got_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
                                  grpc_error *error) {
-  grpc_call_element *elem = ptr;
-  call_data *calld = elem->call_data;
+  grpc_call_element *elem = (grpc_call_element *)ptr;
+  call_data *calld = (call_data *)elem->call_data;
   if (error == GRPC_ERROR_NONE) {
     start_new_rpc(exec_ctx, elem);
   } else {
@@ -822,7 +824,7 @@ static void got_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
 static void accept_stream(grpc_exec_ctx *exec_ctx, void *cd,
                           grpc_transport *transport,
                           const void *transport_server_data) {
-  channel_data *chand = cd;
+  channel_data *chand = (channel_data *)cd;
   /* create a call */
   grpc_call_create_args args;
   memset(&args, 0, sizeof(args));
@@ -838,7 +840,7 @@ static void accept_stream(grpc_exec_ctx *exec_ctx, void *cd,
     GRPC_ERROR_UNREF(error);
     return;
   }
-  call_data *calld = elem->call_data;
+  call_data *calld = (call_data *)elem->call_data;
   grpc_op op;
   memset(&op, 0, sizeof(op));
   op.op = GRPC_OP_RECV_INITIAL_METADATA;
@@ -852,7 +854,7 @@ static void accept_stream(grpc_exec_ctx *exec_ctx, void *cd,
 
 static void channel_connectivity_changed(grpc_exec_ctx *exec_ctx, void *cd,
                                          grpc_error *error) {
-  channel_data *chand = cd;
+  channel_data *chand = (channel_data *)cd;
   grpc_server *server = chand->server;
   if (chand->connectivity_state != GRPC_CHANNEL_SHUTDOWN) {
     grpc_transport_op *op = grpc_make_transport_op(NULL);
@@ -873,8 +875,8 @@ static void channel_connectivity_changed(grpc_exec_ctx *exec_ctx, void *cd,
 static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
                                   grpc_call_element *elem,
                                   const grpc_call_element_args *args) {
-  call_data *calld = elem->call_data;
-  channel_data *chand = elem->channel_data;
+  call_data *calld = (call_data *)elem->call_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
   memset(calld, 0, sizeof(call_data));
   calld->deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
   calld->call = grpc_call_from_top_element(elem);
@@ -891,8 +893,8 @@ static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
 static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
                               const grpc_call_final_info *final_info,
                               grpc_closure *ignored) {
-  channel_data *chand = elem->channel_data;
-  call_data *calld = elem->call_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
+  call_data *calld = (call_data *)elem->call_data;
 
   GPR_ASSERT(calld->state != PENDING);
 
@@ -913,7 +915,7 @@ static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
 static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
                                      grpc_channel_element *elem,
                                      grpc_channel_element_args *args) {
-  channel_data *chand = elem->channel_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
   GPR_ASSERT(args->is_first);
   GPR_ASSERT(!args->is_last);
   chand->server = NULL;
@@ -930,7 +932,7 @@ static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
 static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
                                  grpc_channel_element *elem) {
   size_t i;
-  channel_data *chand = elem->channel_data;
+  channel_data *chand = (channel_data *)elem->channel_data;
   if (chand->registered_methods) {
     for (i = 0; i < chand->registered_method_slots; i++) {
       grpc_slice_unref_internal(exec_ctx, chand->registered_methods[i].method);
@@ -976,8 +978,8 @@ static void register_completion_queue(grpc_server *server,
 
   GRPC_CQ_INTERNAL_REF(cq, "server");
   n = server->cq_count++;
-  server->cqs = gpr_realloc(server->cqs,
-                            server->cq_count * sizeof(grpc_completion_queue *));
+  server->cqs = (grpc_completion_queue **)gpr_realloc(
+      server->cqs, server->cq_count * sizeof(grpc_completion_queue *));
   server->cqs[n] = cq;
 }
 
@@ -1002,7 +1004,7 @@ void grpc_server_register_completion_queue(grpc_server *server,
 grpc_server *grpc_server_create(const grpc_channel_args *args, void *reserved) {
   GRPC_API_TRACE("grpc_server_create(%p, %p)", 2, (args, reserved));
 
-  grpc_server *server = gpr_zalloc(sizeof(grpc_server));
+  grpc_server *server = (grpc_server *)gpr_zalloc(sizeof(grpc_server));
 
   gpr_mu_init(&server->mu_global);
   gpr_mu_init(&server->mu_call);
@@ -1053,7 +1055,7 @@ void *grpc_server_register_method(
             flags);
     return NULL;
   }
-  m = gpr_zalloc(sizeof(registered_method));
+  m = (registered_method *)gpr_zalloc(sizeof(registered_method));
   m->method = gpr_strdup(method);
   m->host = gpr_strdup(host);
   m->next = server->registered_methods;
@@ -1065,7 +1067,7 @@ void *grpc_server_register_method(
 
 static void start_listeners(grpc_exec_ctx *exec_ctx, void *s,
                             grpc_error *error) {
-  grpc_server *server = s;
+  grpc_server *server = (grpc_server *)s;
   for (listener *l = server->listeners; l; l = l->next) {
     l->start(exec_ctx, server, l->arg, server->pollsets, server->pollset_count);
   }
@@ -1086,11 +1088,12 @@ void grpc_server_start(grpc_server *server) {
 
   server->started = true;
   server->pollset_count = 0;
-  server->pollsets = gpr_malloc(sizeof(grpc_pollset *) * server->cq_count);
-  server->request_freelist_per_cq =
-      gpr_malloc(sizeof(*server->request_freelist_per_cq) * server->cq_count);
-  server->requested_calls_per_cq =
-      gpr_malloc(sizeof(*server->requested_calls_per_cq) * server->cq_count);
+  server->pollsets =
+      (grpc_pollset **)gpr_malloc(sizeof(grpc_pollset *) * server->cq_count);
+  server->request_freelist_per_cq = (gpr_stack_lockfree **)gpr_malloc(
+      sizeof(*server->request_freelist_per_cq) * server->cq_count);
+  server->requested_calls_per_cq = (requested_call **)gpr_malloc(
+      sizeof(*server->requested_calls_per_cq) * server->cq_count);
   for (i = 0; i < server->cq_count; i++) {
     if (grpc_cq_can_listen(server->cqs[i])) {
       server->pollsets[server->pollset_count++] =
@@ -1101,9 +1104,9 @@ void grpc_server_start(grpc_server *server) {
     for (int j = 0; j < server->max_requested_calls_per_cq; j++) {
       gpr_stack_lockfree_push(server->request_freelist_per_cq[i], j);
     }
-    server->requested_calls_per_cq[i] =
-        gpr_malloc((size_t)server->max_requested_calls_per_cq *
-                   sizeof(*server->requested_calls_per_cq[i]));
+    server->requested_calls_per_cq[i] = (requested_call *)gpr_malloc(
+        (size_t)server->max_requested_calls_per_cq *
+        sizeof(*server->requested_calls_per_cq[i]));
   }
   request_matcher_init(&server->unregistered_request_matcher,
                        (size_t)server->max_requested_calls_per_cq, server);
@@ -1173,7 +1176,7 @@ void grpc_server_setup_transport(grpc_exec_ctx *exec_ctx, grpc_server *s,
   if (num_registered_methods > 0) {
     slots = 2 * num_registered_methods;
     alloc = sizeof(channel_registered_method) * slots;
-    chand->registered_methods = gpr_zalloc(alloc);
+    chand->registered_methods = (channel_registered_method *)gpr_zalloc(alloc);
     for (rm = s->registered_methods; rm; rm = rm->next) {
       grpc_slice host;
       bool has_host;
@@ -1234,7 +1237,7 @@ void done_published_shutdown(grpc_exec_ctx *exec_ctx, void *done_arg,
 
 static void listener_destroy_done(grpc_exec_ctx *exec_ctx, void *s,
                                   grpc_error *error) {
-  grpc_server *server = s;
+  grpc_server *server = (grpc_server *)s;
   gpr_mu_lock(&server->mu_global);
   server->listeners_destroyed++;
   maybe_finish_shutdown(exec_ctx, server);
@@ -1266,9 +1269,9 @@ void grpc_server_shutdown_and_notify(grpc_server *server,
     gpr_mu_unlock(&server->mu_global);
     goto done;
   }
-  server->shutdown_tags =
-      gpr_realloc(server->shutdown_tags,
-                  sizeof(shutdown_tag) * (server->num_shutdown_tags + 1));
+  server->shutdown_tags = (shutdown_tag *)gpr_realloc(
+      server->shutdown_tags,
+      sizeof(shutdown_tag) * (server->num_shutdown_tags + 1));
   sdt = &server->shutdown_tags[server->num_shutdown_tags++];
   sdt->tag = tag;
   sdt->cq = cq;
@@ -1351,7 +1354,7 @@ void grpc_server_add_listener(
                   grpc_pollset **pollsets, size_t pollset_count),
     void (*destroy)(grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
                     grpc_closure *on_done)) {
-  listener *l = gpr_malloc(sizeof(listener));
+  listener *l = (listener *)gpr_malloc(sizeof(listener));
   l->arg = arg;
   l->start = start;
   l->destroy = destroy;
@@ -1428,7 +1431,7 @@ grpc_call_error grpc_server_request_call(
     grpc_completion_queue *cq_for_notification, void *tag) {
   grpc_call_error error;
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
-  requested_call *rc = gpr_malloc(sizeof(*rc));
+  requested_call *rc = (requested_call *)gpr_malloc(sizeof(*rc));
   GRPC_API_TRACE(
       "grpc_server_request_call("
       "server=%p, call=%p, details=%p, initial_metadata=%p, "
@@ -1473,8 +1476,8 @@ grpc_call_error grpc_server_request_registered_call(
     grpc_completion_queue *cq_for_notification, void *tag) {
   grpc_call_error error;
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
-  requested_call *rc = gpr_malloc(sizeof(*rc));
-  registered_method *rm = rmp;
+  requested_call *rc = (requested_call *)gpr_malloc(sizeof(*rc));
+  registered_method *rm = (registered_method *)rmp;
   GRPC_API_TRACE(
       "grpc_server_request_registered_call("
       "server=%p, rmp=%p, call=%p, deadline=%p, initial_metadata=%p, "
diff --git a/src/core/lib/transport/connectivity_state.c b/src/core/lib/transport/connectivity_state.c
index 73a9178ae2..f328a6cdbb 100644
--- a/src/core/lib/transport/connectivity_state.c
+++ b/src/core/lib/transport/connectivity_state.c
@@ -148,7 +148,8 @@ bool grpc_connectivity_state_notify_on_state_change(
       GRPC_CLOSURE_SCHED(exec_ctx, notify,
                          GRPC_ERROR_REF(tracker->current_error));
     } else {
-      grpc_connectivity_state_watcher *w = gpr_malloc(sizeof(*w));
+      grpc_connectivity_state_watcher *w =
+          (grpc_connectivity_state_watcher *)gpr_malloc(sizeof(*w));
       w->current = current;
       w->notify = notify;
       w->next = tracker->watchers;
diff --git a/src/core/lib/transport/metadata.c b/src/core/lib/transport/metadata.c
index 2fea366072..188b485625 100644
--- a/src/core/lib/transport/metadata.c
+++ b/src/core/lib/transport/metadata.c
@@ -117,7 +117,8 @@ void grpc_mdctx_global_init(void) {
     shard->count = 0;
     gpr_atm_no_barrier_store(&shard->free_estimate, 0);
     shard->capacity = INITIAL_SHARD_CAPACITY;
-    shard->elems = gpr_zalloc(sizeof(*shard->elems) * shard->capacity);
+    shard->elems = (interned_metadata **)gpr_zalloc(sizeof(*shard->elems) *
+                                                    shard->capacity);
   }
 }
 
@@ -204,7 +205,8 @@ static void grow_mdtab(mdtab_shard *shard) {
 
   GPR_TIMER_BEGIN("grow_mdtab", 0);
 
-  mdtab = gpr_zalloc(sizeof(interned_metadata *) * capacity);
+  mdtab =
+      (interned_metadata **)gpr_zalloc(sizeof(interned_metadata *) * capacity);
 
   for (i = 0; i < shard->capacity; i++) {
     for (md = shard->elems[i]; md; md = next) {
@@ -243,7 +245,8 @@ grpc_mdelem grpc_mdelem_create(
                               GRPC_MDELEM_STORAGE_EXTERNAL);
     }
 
-    allocated_metadata *allocated = gpr_malloc(sizeof(*allocated));
+    allocated_metadata *allocated =
+        (allocated_metadata *)gpr_malloc(sizeof(*allocated));
     allocated->key = grpc_slice_ref_internal(key);
     allocated->value = grpc_slice_ref_internal(value);
     gpr_atm_rel_store(&allocated->refcnt, 1);
@@ -292,7 +295,7 @@ grpc_mdelem grpc_mdelem_create(
   }
 
   /* not found: create a new pair */
-  md = gpr_malloc(sizeof(interned_metadata));
+  md = (interned_metadata *)gpr_malloc(sizeof(interned_metadata));
   gpr_atm_rel_store(&md->refcnt, 1);
   md->key = grpc_slice_ref_internal(key);
   md->value = grpc_slice_ref_internal(value);
diff --git a/src/core/lib/transport/service_config.c b/src/core/lib/transport/service_config.c
index 0379d0010d..070a13a2b4 100644
--- a/src/core/lib/transport/service_config.c
+++ b/src/core/lib/transport/service_config.c
@@ -59,7 +59,8 @@ struct grpc_service_config {
 };
 
 grpc_service_config* grpc_service_config_create(const char* json_string) {
-  grpc_service_config* service_config = gpr_malloc(sizeof(*service_config));
+  grpc_service_config* service_config =
+      (grpc_service_config*)gpr_malloc(sizeof(*service_config));
   service_config->json_string = gpr_strdup(json_string);
   service_config->json_tree =
       grpc_json_parse_string(service_config->json_string);
@@ -198,7 +199,8 @@ grpc_slice_hash_table* grpc_service_config_create_method_config_table(
         num_entries += count_names_in_method_config_json(method);
       }
       // Populate method config table entries.
-      entries = gpr_malloc(num_entries * sizeof(grpc_slice_hash_table_entry));
+      entries = (grpc_slice_hash_table_entry*)gpr_malloc(
+          num_entries * sizeof(grpc_slice_hash_table_entry));
       size_t idx = 0;
       for (grpc_json* method = field->child; method != NULL;
            method = method->next) {
@@ -230,7 +232,7 @@ void* grpc_method_config_table_get(grpc_exec_ctx* exec_ctx,
     char* path_str = grpc_slice_to_c_string(path);
     const char* sep = strrchr(path_str, '/') + 1;
     const size_t len = (size_t)(sep - path_str);
-    char* buf = gpr_malloc(len + 2);  // '*' and NUL
+    char* buf = (char*)gpr_malloc(len + 2);  // '*' and NUL
     memcpy(buf, path_str, len);
     buf[len] = '*';
     buf[len + 1] = '\0';
diff --git a/src/core/lib/transport/transport.c b/src/core/lib/transport/transport.c
index b32e8e7d4c..caa11a956e 100644
--- a/src/core/lib/transport/transport.c
+++ b/src/core/lib/transport/transport.c
@@ -243,13 +243,13 @@ typedef struct {
 
 static void destroy_made_transport_op(grpc_exec_ctx *exec_ctx, void *arg,
                                       grpc_error *error) {
-  made_transport_op *op = arg;
+  made_transport_op *op = (made_transport_op *)arg;
   GRPC_CLOSURE_SCHED(exec_ctx, op->inner_on_complete, GRPC_ERROR_REF(error));
   gpr_free(op);
 }
 
 grpc_transport_op *grpc_make_transport_op(grpc_closure *on_complete) {
-  made_transport_op *op = gpr_malloc(sizeof(*op));
+  made_transport_op *op = (made_transport_op *)gpr_malloc(sizeof(*op));
   GRPC_CLOSURE_INIT(&op->outer_on_complete, destroy_made_transport_op, op,
                     grpc_schedule_on_exec_ctx);
   op->inner_on_complete = on_complete;
@@ -267,7 +267,7 @@ typedef struct {
 
 static void destroy_made_transport_stream_op(grpc_exec_ctx *exec_ctx, void *arg,
                                              grpc_error *error) {
-  made_transport_stream_op *op = arg;
+  made_transport_stream_op *op = (made_transport_stream_op *)arg;
   grpc_closure *c = op->inner_on_complete;
   gpr_free(op);
   GRPC_CLOSURE_RUN(exec_ctx, c, GRPC_ERROR_REF(error));
@@ -275,7 +275,8 @@ static void destroy_made_transport_stream_op(grpc_exec_ctx *exec_ctx, void *arg,
 
 grpc_transport_stream_op_batch *grpc_make_transport_stream_op(
     grpc_closure *on_complete) {
-  made_transport_stream_op *op = gpr_zalloc(sizeof(*op));
+  made_transport_stream_op *op =
+      (made_transport_stream_op *)gpr_zalloc(sizeof(*op));
   op->op.payload = &op->payload;
   GRPC_CLOSURE_INIT(&op->outer_on_complete, destroy_made_transport_stream_op,
                     op, grpc_schedule_on_exec_ctx);