Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
new file mode 100644
index 0000000..fd24280
--- /dev/null
+++ b/src/wasm/wasm-module.cc
@@ -0,0 +1,511 @@
+// Copyright 2015 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/macro-assembler.h"
+#include "src/objects.h"
+#include "src/v8.h"
+
+#include "src/simulator.h"
+
+#include "src/wasm/ast-decoder.h"
+#include "src/wasm/module-decoder.h"
+#include "src/wasm/wasm-module.h"
+#include "src/wasm/wasm-result.h"
+
+#include "src/compiler/wasm-compiler.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+std::ostream& operator<<(std::ostream& os, const WasmModule& module) {
+ os << "WASM module with ";
+ os << (1 << module.min_mem_size_log2) << " min mem";
+ os << (1 << module.max_mem_size_log2) << " max mem";
+ if (module.functions) os << module.functions->size() << " functions";
+ if (module.globals) os << module.functions->size() << " globals";
+ if (module.data_segments) os << module.functions->size() << " data segments";
+ return os;
+}
+
+
+std::ostream& operator<<(std::ostream& os, const WasmFunction& function) {
+ os << "WASM function with signature ";
+
+ // TODO(titzer): factor out rendering of signatures.
+ if (function.sig->return_count() == 0) os << "v";
+ for (size_t i = 0; i < function.sig->return_count(); i++) {
+ os << WasmOpcodes::ShortNameOf(function.sig->GetReturn(i));
+ }
+ os << "_";
+ if (function.sig->parameter_count() == 0) os << "v";
+ for (size_t i = 0; i < function.sig->parameter_count(); i++) {
+ os << WasmOpcodes::ShortNameOf(function.sig->GetParam(i));
+ }
+ os << " locals: ";
+ if (function.local_int32_count)
+ os << function.local_int32_count << " int32s ";
+ if (function.local_int64_count)
+ os << function.local_int64_count << " int64s ";
+ if (function.local_float32_count)
+ os << function.local_float32_count << " float32s ";
+ if (function.local_float64_count)
+ os << function.local_float64_count << " float64s ";
+
+ os << " code bytes: "
+ << (function.code_end_offset - function.code_start_offset);
+ return os;
+}
+
+
+// A helper class for compiling multiple wasm functions that offers
+// placeholder code objects for calling functions that are not yet compiled.
+class WasmLinker {
+ public:
+ WasmLinker(Isolate* isolate, size_t size)
+ : isolate_(isolate), placeholder_code_(size), function_code_(size) {}
+
+ // Get the code object for a function, allocating a placeholder if it has
+ // not yet been compiled.
+ Handle<Code> GetFunctionCode(uint32_t index) {
+ DCHECK(index < function_code_.size());
+ if (function_code_[index].is_null()) {
+ // Create a placeholder code object and encode the corresponding index in
+ // the {constant_pool_offset} field of the code object.
+ // TODO(titzer): placeholder code objects are somewhat dangerous.
+ Handle<Code> self(nullptr, isolate_);
+ byte buffer[] = {0, 0, 0, 0, 0, 0, 0, 0}; // fake instructions.
+ CodeDesc desc = {buffer, 8, 8, 0, 0, nullptr};
+ Handle<Code> code = isolate_->factory()->NewCode(
+ desc, Code::KindField::encode(Code::WASM_FUNCTION), self);
+ code->set_constant_pool_offset(index + kPlaceholderMarker);
+ placeholder_code_[index] = code;
+ function_code_[index] = code;
+ }
+ return function_code_[index];
+ }
+
+ void Finish(uint32_t index, Handle<Code> code) {
+ DCHECK(index < function_code_.size());
+ function_code_[index] = code;
+ }
+
+ void Link(Handle<FixedArray> function_table,
+ std::vector<uint16_t>* functions) {
+ for (size_t i = 0; i < function_code_.size(); i++) {
+ LinkFunction(function_code_[i]);
+ }
+ if (functions && !function_table.is_null()) {
+ int table_size = static_cast<int>(functions->size());
+ DCHECK_EQ(function_table->length(), table_size * 2);
+ for (int i = 0; i < table_size; i++) {
+ function_table->set(i + table_size, *function_code_[functions->at(i)]);
+ }
+ }
+ }
+
+ private:
+ static const int kPlaceholderMarker = 1000000000;
+
+ Isolate* isolate_;
+ std::vector<Handle<Code>> placeholder_code_;
+ std::vector<Handle<Code>> function_code_;
+
+ void LinkFunction(Handle<Code> code) {
+ bool modified = false;
+ int mode_mask = RelocInfo::kCodeTargetMask;
+ AllowDeferredHandleDereference embedding_raw_address;
+ for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
+ RelocInfo::Mode mode = it.rinfo()->rmode();
+ if (RelocInfo::IsCodeTarget(mode)) {
+ Code* target =
+ Code::GetCodeFromTargetAddress(it.rinfo()->target_address());
+ if (target->kind() == Code::WASM_FUNCTION &&
+ target->constant_pool_offset() >= kPlaceholderMarker) {
+ // Patch direct calls to placeholder code objects.
+ uint32_t index = target->constant_pool_offset() - kPlaceholderMarker;
+ CHECK(index < function_code_.size());
+ Handle<Code> new_target = function_code_[index];
+ if (target != *new_target) {
+ CHECK_EQ(*placeholder_code_[index], target);
+ it.rinfo()->set_target_address(new_target->instruction_start(),
+ SKIP_WRITE_BARRIER,
+ SKIP_ICACHE_FLUSH);
+ modified = true;
+ }
+ }
+ }
+ }
+ if (modified) {
+ Assembler::FlushICache(isolate_, code->instruction_start(),
+ code->instruction_size());
+ }
+ }
+};
+
+namespace {
+// Internal constants for the layout of the module object.
+const int kWasmModuleInternalFieldCount = 4;
+const int kWasmModuleFunctionTable = 0;
+const int kWasmModuleCodeTable = 1;
+const int kWasmMemArrayBuffer = 2;
+const int kWasmGlobalsArrayBuffer = 3;
+
+
+size_t AllocateGlobalsOffsets(std::vector<WasmGlobal>* globals) {
+ uint32_t offset = 0;
+ if (!globals) return 0;
+ for (WasmGlobal& global : *globals) {
+ byte size = WasmOpcodes::MemSize(global.type);
+ offset = (offset + size - 1) & ~(size - 1); // align
+ global.offset = offset;
+ offset += size;
+ }
+ return offset;
+}
+
+
+void LoadDataSegments(WasmModule* module, byte* mem_addr, size_t mem_size) {
+ for (const WasmDataSegment& segment : *module->data_segments) {
+ if (!segment.init) continue;
+ CHECK_LT(segment.dest_addr, mem_size);
+ CHECK_LE(segment.source_size, mem_size);
+ CHECK_LE(segment.dest_addr + segment.source_size, mem_size);
+ byte* addr = mem_addr + segment.dest_addr;
+ memcpy(addr, module->module_start + segment.source_offset,
+ segment.source_size);
+ }
+}
+
+
+Handle<FixedArray> BuildFunctionTable(Isolate* isolate, WasmModule* module) {
+ if (!module->function_table || module->function_table->size() == 0) {
+ return Handle<FixedArray>::null();
+ }
+ int table_size = static_cast<int>(module->function_table->size());
+ Handle<FixedArray> fixed = isolate->factory()->NewFixedArray(2 * table_size);
+ for (int i = 0; i < table_size; i++) {
+ WasmFunction* function =
+ &module->functions->at(module->function_table->at(i));
+ fixed->set(i, Smi::FromInt(function->sig_index));
+ }
+ return fixed;
+}
+
+
+Handle<JSArrayBuffer> NewArrayBuffer(Isolate* isolate, int size,
+ byte** backing_store) {
+ void* memory = isolate->array_buffer_allocator()->Allocate(size);
+ if (!memory) return Handle<JSArrayBuffer>::null();
+ *backing_store = reinterpret_cast<byte*>(memory);
+
+#if DEBUG
+ // Double check the API allocator actually zero-initialized the memory.
+ for (int i = 0; i < size; i++) {
+ DCHECK_EQ(0, (*backing_store)[i]);
+ }
+#endif
+
+ Handle<JSArrayBuffer> buffer = isolate->factory()->NewJSArrayBuffer();
+ JSArrayBuffer::Setup(buffer, isolate, false, memory, size);
+ buffer->set_is_neuterable(false);
+ return buffer;
+}
+} // namespace
+
+
+WasmModule::WasmModule()
+ : globals(nullptr),
+ signatures(nullptr),
+ functions(nullptr),
+ data_segments(nullptr),
+ function_table(nullptr) {}
+
+
+WasmModule::~WasmModule() {
+ if (globals) delete globals;
+ if (signatures) delete signatures;
+ if (functions) delete functions;
+ if (data_segments) delete data_segments;
+ if (function_table) delete function_table;
+}
+
+
+// Instantiates a wasm module as a JSObject.
+// * allocates a backing store of {mem_size} bytes.
+// * installs a named property "memory" for that buffer if exported
+// * installs named properties on the object for exported functions
+// * compiles wasm code to machine code
+MaybeHandle<JSObject> WasmModule::Instantiate(Isolate* isolate,
+ Handle<JSObject> ffi,
+ Handle<JSArrayBuffer> memory) {
+ this->shared_isolate = isolate; // TODO(titzer): have a real shared isolate.
+ ErrorThrower thrower(isolate, "WasmModule::Instantiate()");
+
+ Factory* factory = isolate->factory();
+ // Memory is bigger than maximum supported size.
+ if (memory.is_null() && min_mem_size_log2 > kMaxMemSize) {
+ thrower.Error("Out of memory: wasm memory too large");
+ return MaybeHandle<JSObject>();
+ }
+
+ Handle<Map> map = factory->NewMap(
+ JS_OBJECT_TYPE,
+ JSObject::kHeaderSize + kWasmModuleInternalFieldCount * kPointerSize);
+
+ //-------------------------------------------------------------------------
+ // Allocate the module object.
+ //-------------------------------------------------------------------------
+ Handle<JSObject> module = factory->NewJSObjectFromMap(map, TENURED);
+ Handle<FixedArray> code_table =
+ factory->NewFixedArray(static_cast<int>(functions->size()), TENURED);
+
+ //-------------------------------------------------------------------------
+ // Allocate the linear memory.
+ //-------------------------------------------------------------------------
+ uint32_t mem_size = 1 << min_mem_size_log2;
+ byte* mem_addr = nullptr;
+ Handle<JSArrayBuffer> mem_buffer;
+ if (!memory.is_null()) {
+ memory->set_is_neuterable(false);
+ mem_addr = reinterpret_cast<byte*>(memory->backing_store());
+ mem_size = memory->byte_length()->Number();
+ mem_buffer = memory;
+ } else {
+ mem_buffer = NewArrayBuffer(isolate, mem_size, &mem_addr);
+ if (!mem_addr) {
+ // Not enough space for backing store of memory
+ thrower.Error("Out of memory: wasm memory");
+ return MaybeHandle<JSObject>();
+ }
+ }
+
+ // Load initialized data segments.
+ LoadDataSegments(this, mem_addr, mem_size);
+
+ module->SetInternalField(kWasmMemArrayBuffer, *mem_buffer);
+
+ if (mem_export) {
+ // Export the memory as a named property.
+ Handle<String> name = factory->InternalizeUtf8String("memory");
+ JSObject::AddProperty(module, name, mem_buffer, READ_ONLY);
+ }
+
+ //-------------------------------------------------------------------------
+ // Allocate the globals area if necessary.
+ //-------------------------------------------------------------------------
+ size_t globals_size = AllocateGlobalsOffsets(globals);
+ byte* globals_addr = nullptr;
+ if (globals_size > 0) {
+ Handle<JSArrayBuffer> globals_buffer =
+ NewArrayBuffer(isolate, mem_size, &globals_addr);
+ if (!globals_addr) {
+ // Not enough space for backing store of globals.
+ thrower.Error("Out of memory: wasm globals");
+ return MaybeHandle<JSObject>();
+ }
+
+ module->SetInternalField(kWasmGlobalsArrayBuffer, *globals_buffer);
+ } else {
+ module->SetInternalField(kWasmGlobalsArrayBuffer, Smi::FromInt(0));
+ }
+
+ //-------------------------------------------------------------------------
+ // Compile all functions in the module.
+ //-------------------------------------------------------------------------
+ int index = 0;
+ WasmLinker linker(isolate, functions->size());
+ ModuleEnv module_env;
+ module_env.module = this;
+ module_env.mem_start = reinterpret_cast<uintptr_t>(mem_addr);
+ module_env.mem_end = reinterpret_cast<uintptr_t>(mem_addr) + mem_size;
+ module_env.globals_area = reinterpret_cast<uintptr_t>(globals_addr);
+ module_env.linker = &linker;
+ module_env.function_code = nullptr;
+ module_env.function_table = BuildFunctionTable(isolate, this);
+ module_env.memory = memory;
+ module_env.context = isolate->native_context();
+ module_env.asm_js = false;
+
+ // First pass: compile each function and initialize the code table.
+ for (const WasmFunction& func : *functions) {
+ if (thrower.error()) break;
+
+ const char* cstr = GetName(func.name_offset);
+ Handle<String> name = factory->InternalizeUtf8String(cstr);
+ Handle<Code> code = Handle<Code>::null();
+ Handle<JSFunction> function = Handle<JSFunction>::null();
+ if (func.external) {
+ // Lookup external function in FFI object.
+ if (!ffi.is_null()) {
+ MaybeHandle<Object> result = Object::GetProperty(ffi, name);
+ if (!result.is_null()) {
+ Handle<Object> obj = result.ToHandleChecked();
+ if (obj->IsJSFunction()) {
+ function = Handle<JSFunction>::cast(obj);
+ code = compiler::CompileWasmToJSWrapper(isolate, &module_env,
+ function, index);
+ } else {
+ thrower.Error("FFI function #%d:%s is not a JSFunction.", index,
+ cstr);
+ return MaybeHandle<JSObject>();
+ }
+ } else {
+ thrower.Error("FFI function #%d:%s not found.", index, cstr);
+ return MaybeHandle<JSObject>();
+ }
+ } else {
+ thrower.Error("FFI table is not an object.");
+ return MaybeHandle<JSObject>();
+ }
+ } else {
+ // Compile the function.
+ code = compiler::CompileWasmFunction(thrower, isolate, &module_env, func,
+ index);
+ if (code.is_null()) {
+ thrower.Error("Compilation of #%d:%s failed.", index, cstr);
+ return MaybeHandle<JSObject>();
+ }
+ if (func.exported) {
+ function = compiler::CompileJSToWasmWrapper(isolate, &module_env, name,
+ code, module, index);
+ }
+ }
+ if (!code.is_null()) {
+ // Install the code into the linker table.
+ linker.Finish(index, code);
+ code_table->set(index, *code);
+ }
+ if (func.exported) {
+ // Exported functions are installed as read-only properties on the module.
+ JSObject::AddProperty(module, name, function, READ_ONLY);
+ }
+ index++;
+ }
+
+ // Second pass: patch all direct call sites.
+ linker.Link(module_env.function_table, this->function_table);
+
+ module->SetInternalField(kWasmModuleFunctionTable, Smi::FromInt(0));
+ module->SetInternalField(kWasmModuleCodeTable, *code_table);
+ return module;
+}
+
+
+Handle<Code> ModuleEnv::GetFunctionCode(uint32_t index) {
+ DCHECK(IsValidFunction(index));
+ if (linker) return linker->GetFunctionCode(index);
+ if (function_code) return function_code->at(index);
+ return Handle<Code>::null();
+}
+
+
+compiler::CallDescriptor* ModuleEnv::GetCallDescriptor(Zone* zone,
+ uint32_t index) {
+ DCHECK(IsValidFunction(index));
+ // Always make a direct call to whatever is in the table at that location.
+ // A wrapper will be generated for FFI calls.
+ WasmFunction* function = &module->functions->at(index);
+ return GetWasmCallDescriptor(zone, function->sig);
+}
+
+
+int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,
+ const byte* module_end, bool asm_js) {
+ HandleScope scope(isolate);
+ Zone zone;
+ // Decode the module, but don't verify function bodies, since we'll
+ // be compiling them anyway.
+ ModuleResult result =
+ DecodeWasmModule(isolate, &zone, module_start, module_end, false, false);
+ if (result.failed()) {
+ // Module verification failed. throw.
+ std::ostringstream str;
+ str << "WASM.compileRun() failed: " << result;
+ isolate->Throw(
+ *isolate->factory()->NewStringFromAsciiChecked(str.str().c_str()));
+ return -1;
+ }
+
+ int32_t retval = CompileAndRunWasmModule(isolate, result.val);
+ delete result.val;
+ return retval;
+}
+
+
+int32_t CompileAndRunWasmModule(Isolate* isolate, WasmModule* module) {
+ ErrorThrower thrower(isolate, "CompileAndRunWasmModule");
+
+ // Allocate temporary linear memory and globals.
+ size_t mem_size = 1 << module->min_mem_size_log2;
+ size_t globals_size = AllocateGlobalsOffsets(module->globals);
+
+ base::SmartArrayPointer<byte> mem_addr(new byte[mem_size]);
+ base::SmartArrayPointer<byte> globals_addr(new byte[globals_size]);
+
+ memset(mem_addr.get(), 0, mem_size);
+ memset(globals_addr.get(), 0, globals_size);
+
+ // Create module environment.
+ WasmLinker linker(isolate, module->functions->size());
+ ModuleEnv module_env;
+ module_env.module = module;
+ module_env.mem_start = reinterpret_cast<uintptr_t>(mem_addr.get());
+ module_env.mem_end = reinterpret_cast<uintptr_t>(mem_addr.get()) + mem_size;
+ module_env.globals_area = reinterpret_cast<uintptr_t>(globals_addr.get());
+ module_env.linker = &linker;
+ module_env.function_code = nullptr;
+ module_env.function_table = BuildFunctionTable(isolate, module);
+ module_env.asm_js = false;
+
+ // Load data segments.
+ // TODO(titzer): throw instead of crashing if segments don't fit in memory?
+ LoadDataSegments(module, mem_addr.get(), mem_size);
+
+ // Compile all functions.
+ Handle<Code> main_code = Handle<Code>::null(); // record last code.
+ int index = 0;
+ for (const WasmFunction& func : *module->functions) {
+ if (!func.external) {
+ // Compile the function and install it in the code table.
+ Handle<Code> code = compiler::CompileWasmFunction(
+ thrower, isolate, &module_env, func, index);
+ if (!code.is_null()) {
+ if (func.exported) main_code = code;
+ linker.Finish(index, code);
+ }
+ if (thrower.error()) return -1;
+ }
+ index++;
+ }
+
+ if (!main_code.is_null()) {
+ linker.Link(module_env.function_table, module->function_table);
+#if USE_SIMULATOR && V8_TARGET_ARCH_ARM64
+ // Run the main code on arm64 simulator.
+ Simulator* simulator = Simulator::current(isolate);
+ Simulator::CallArgument args[] = {Simulator::CallArgument(0),
+ Simulator::CallArgument::End()};
+ return static_cast<int32_t>(simulator->CallInt64(main_code->entry(), args));
+#elif USE_SIMULATOR
+ // Run the main code on simulator.
+ Simulator* simulator = Simulator::current(isolate);
+ return static_cast<int32_t>(
+ simulator->Call(main_code->entry(), 4, 0, 0, 0, 0));
+#else
+ // Run the main code as raw machine code.
+ int32_t (*raw_func)() = reinterpret_cast<int32_t (*)()>(
+ reinterpret_cast<uintptr_t>(main_code->entry()));
+ return raw_func();
+#endif
+ } else {
+ // No main code was found.
+ isolate->Throw(*isolate->factory()->NewStringFromStaticChars(
+ "WASM.compileRun() failed: no valid main code produced."));
+ }
+ return -1;
+}
+} // namespace wasm
+} // namespace internal
+} // namespace v8