Added irt extension support for supplying the nacl_irt_memory interface.

tests/irt_ext/mem_calls.c

+/*
+ * Copyright (c) 2014 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "native_client/src/include/nacl_assert.h"
+#include "native_client/src/untrusted/irt/irt.h"
+#include "native_client/src/untrusted/irt/irt_extension.h"
+#include "native_client/tests/irt_ext/mem_calls.h"
+
+static struct mem_calls_environment *g_activated_env = NULL;
+static const struct mem_calls_environment g_empty_env = { 0 };
+static struct nacl_irt_memory g_irt_memory = { NULL };
+
+static int my_mmap(void **addr, size_t len, int prot, int flags, int fd,
+                   nacl_irt_off_t off) {
+  if (g_activated_env) {
+    g_activated_env->num_mmap_calls++;
+  }
+
+  return g_irt_memory.mmap(addr, len, prot, flags, fd, off);
+}
+
+static int my_munmap(void *addr, size_t len) {
+  if (g_activated_env) {
+    g_activated_env->num_munmap_calls++;
+  }
+
+  return g_irt_memory.munmap(addr, len);
+}
+
+static int my_mprotect(void *addr, size_t len, int prot) {
+  if (g_activated_env) {
+    g_activated_env->num_mprotect_calls++;
+  }
+
+  return g_irt_memory.mprotect(addr, len, prot);
+}
+
+void init_mem_calls_module(void) {
+  size_t bytes = nacl_interface_query(NACL_IRT_MEMORY_v0_3,
+                                      &g_irt_memory, sizeof(g_irt_memory));
+  ASSERT_EQ(bytes, sizeof(g_irt_memory));
+
+  struct nacl_irt_memory mem = {
+    my_mmap,
+    my_munmap,
+    my_mprotect
+  };
+
+  bytes = nacl_interface_ext_supply(NACL_IRT_MEMORY_v0_3, &mem,
+                                    sizeof(mem));
+  ASSERT_EQ(bytes, sizeof(mem));
+}
+
+void init_mem_calls_environment(struct mem_calls_environment *env) {
+  *env = g_empty_env;
+}
+
+void activate_mem_calls_env(struct mem_calls_environment *env) {
+  g_activated_env = env;
+}
+
+void deactivate_mem_calls_env(void) {
+  g_activated_env = NULL;
+}