Refactor interpreter for linking support

* Create WasmInterpreterEnvironment to hold all modules, functions,
  globals, tables and memories
* There are now three index spaces: "module", "environment" and
  "defined".
  - The "module" index space matches up w/ the normal WebAssembly index
    space, which is distinct for functions, globals, tables, etc.
  - The "environment" index space is a combined index space for all loaded
    modules.
  - The "defined" index space only includes defined objects, not
    imported objects. This is used, for example, when iterating over the
    code section; the function bodies are only specified for defined
    functions.
* A thread is implicitly associated with a module and environment, so
  simplify many function signatures to remove those additional arguments
* Any importable kind can be imported from a host module. Unfortunately,
  since the spec tests require polymorphic imports, the importing
  mechanism must be callback-based
* When interpreting spec tests, the environment and all modules must be
  retained throughout
* Move the binding hash code out of wasm-ast.{c,h} =>
  wasm-binding-hash.{c,h}
* Add wasm_init_output_buffer, for initializing the environment's
  instruction stream independently from a WasmMemoryWriter
* Add wasm_init_mem_writer_existing for initializing a WasmMemoryWriter
  given an existing WasmOutputBuffer
* Add predefined "spectest" module, with a generic function import.
  Still need to implement the spectest table, memory and global imports

1 files changed, 54 insertions, 0 deletions

diff --git a/src/wasm-binding-hash.h b/src/wasm-binding-hash.h
new file mode 100644
index 00000000..2897e44a
--- /dev/null
+++ b/src/wasm-binding-hash.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WASM_BINDING_HASH_H_
+#define WASM_BINDING_HASH_H_
+
+#include "wasm-common.h"
+#include "wasm-vector.h"
+
+struct WasmAllocator;
+
+typedef struct WasmBinding {
+  WasmLocation loc;
+  WasmStringSlice name;
+  int index;
+} WasmBinding;
+
+typedef struct WasmBindingHashEntry {
+  WasmBinding binding;
+  struct WasmBindingHashEntry* next;
+  struct WasmBindingHashEntry* prev; /* only valid when this entry is unused */
+} WasmBindingHashEntry;
+WASM_DEFINE_VECTOR(binding_hash_entry, WasmBindingHashEntry);
+
+typedef struct WasmBindingHash {
+  WasmBindingHashEntryVector entries;
+  WasmBindingHashEntry* free_head;
+} WasmBindingHash;
+
+WASM_EXTERN_C_BEGIN
+WasmBinding* wasm_insert_binding(struct WasmAllocator*,
+                                 WasmBindingHash*,
+                                 const WasmStringSlice*);
+WasmBool wasm_hash_entry_is_free(const WasmBindingHashEntry*);
+/* returns -1 if the name is not in the hash */
+int wasm_find_binding_index_by_name(const WasmBindingHash*,
+                                    const WasmStringSlice* name);
+void wasm_destroy_binding_hash(struct WasmAllocator*, WasmBindingHash*);
+WASM_EXTERN_C_END
+
+#endif /* WASM_BINDING_HASH_H_ */