Merge V8 5.2.361.47 DO NOT MERGE
https://chromium.googlesource.com/v8/v8/+/5.2.361.47
FPIIM-449
Change-Id: Ibec421b85a9b88cb3a432ada642e469fe7e78346
(cherry picked from commit bcf72ee8e3b26f1d0726869c7ddb3921c68b09a8)
diff --git a/src/wasm/wasm-function-name-table.cc b/src/wasm/wasm-function-name-table.cc
new file mode 100644
index 0000000..f082704
--- /dev/null
+++ b/src/wasm/wasm-function-name-table.cc
@@ -0,0 +1,74 @@
+// Copyright 2016 the V8 project 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 "src/wasm/wasm-function-name-table.h"
+
+#include "src/wasm/wasm-module.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+// Build an array with all function names. If there are N functions in the
+// module, then the first (kIntSize * (N+1)) bytes are integer entries.
+// The first integer entry encodes the number of functions in the module.
+// The entries 1 to N contain offsets into the second part of this array.
+// After these N+1 integer entries, the second part begins, which holds a
+// concatenation of all function names.
+//
+// Returns undefined if the array length would not fit in an integer value
+Handle<Object> BuildFunctionNamesTable(Isolate* isolate, WasmModule* module) {
+ uint64_t func_names_length = 0;
+ for (auto& func : module->functions) func_names_length += func.name_length;
+ int num_funcs_int = static_cast<int>(module->functions.size());
+ int current_offset = (num_funcs_int + 1) * kIntSize;
+ uint64_t total_array_length = current_offset + func_names_length;
+ int total_array_length_int = static_cast<int>(total_array_length);
+ // Check for overflow. Just skip function names if it happens.
+ if (total_array_length_int != total_array_length || num_funcs_int < 0 ||
+ num_funcs_int != module->functions.size())
+ return isolate->factory()->undefined_value();
+ Handle<ByteArray> func_names_array =
+ isolate->factory()->NewByteArray(total_array_length_int, TENURED);
+ if (func_names_array.is_null()) return isolate->factory()->undefined_value();
+ func_names_array->set_int(0, num_funcs_int);
+ int func_index = 0;
+ for (WasmFunction& fun : module->functions) {
+ WasmName name = module->GetNameOrNull(&fun);
+ func_names_array->copy_in(current_offset,
+ reinterpret_cast<const byte*>(name.start()),
+ name.length());
+ func_names_array->set_int(func_index + 1, current_offset);
+ current_offset += name.length();
+ ++func_index;
+ }
+ return func_names_array;
+}
+
+Handle<Object> GetWasmFunctionNameFromTable(Handle<ByteArray> func_names_array,
+ uint32_t func_index) {
+ uint32_t num_funcs = static_cast<uint32_t>(func_names_array->get_int(0));
+ DCHECK(static_cast<int>(num_funcs) >= 0);
+ auto undefined = [&func_names_array]() -> Handle<Object> {
+ return func_names_array->GetIsolate()->factory()->undefined_value();
+ };
+ if (func_index >= num_funcs) return undefined();
+ int offset = func_names_array->get_int(func_index + 1);
+ int next_offset = func_index == num_funcs - 1
+ ? func_names_array->length()
+ : func_names_array->get_int(func_index + 2);
+ ScopedVector<byte> buffer(next_offset - offset);
+ func_names_array->copy_out(offset, buffer.start(), next_offset - offset);
+ if (!unibrow::Utf8::Validate(buffer.start(), buffer.length())) {
+ return undefined();
+ }
+ MaybeHandle<Object> maybe_name =
+ func_names_array->GetIsolate()->factory()->NewStringFromUtf8(
+ Vector<const char>::cast(buffer));
+ return maybe_name.is_null() ? undefined() : maybe_name.ToHandleChecked();
+}
+
+} // namespace wasm
+} // namespace internal
+} // namespace v8