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// 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/runtime/runtime-utils.h"
#include "src/arguments.h"
#include "src/assembler.h"
#include "src/compiler/wasm-compiler.h"
#include "src/conversions.h"
#include "src/debug/debug.h"
#include "src/factory.h"
#include "src/frames-inl.h"
#include "src/objects-inl.h"
#include "src/v8memory.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects.h"
#include "src/wasm/wasm-opcodes.h"
namespace v8 {
namespace internal {
namespace {
WasmInstanceObject* GetWasmInstanceOnStackTop(Isolate* isolate) {
DisallowHeapAllocation no_allocation;
const Address entry = Isolate::c_entry_fp(isolate->thread_local_top());
Address pc =
Memory::Address_at(entry + StandardFrameConstants::kCallerPCOffset);
Code* code = isolate->inner_pointer_to_code_cache()->GetCacheEntry(pc)->code;
DCHECK_EQ(Code::WASM_FUNCTION, code->kind());
WasmInstanceObject* owning_instance = wasm::GetOwningWasmInstance(code);
CHECK_NOT_NULL(owning_instance);
return owning_instance;
}
Context* GetWasmContextOnStackTop(Isolate* isolate) {
return GetWasmInstanceOnStackTop(isolate)
->compiled_module()
->ptr_to_native_context();
}
} // namespace
RUNTIME_FUNCTION(Runtime_WasmMemorySize) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
Handle<WasmInstanceObject> instance(GetWasmInstanceOnStackTop(isolate),
isolate);
return *isolate->factory()->NewNumberFromInt(
wasm::GetInstanceMemorySize(isolate, instance));
}
RUNTIME_FUNCTION(Runtime_WasmGrowMemory) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_UINT32_ARG_CHECKED(delta_pages, 0);
Handle<WasmInstanceObject> instance(GetWasmInstanceOnStackTop(isolate),
isolate);
// Set the current isolate's context.
DCHECK_NULL(isolate->context());
isolate->set_context(instance->compiled_module()->ptr_to_native_context());
return *isolate->factory()->NewNumberFromInt(
wasm::GrowMemory(isolate, instance, delta_pages));
}
Object* ThrowRuntimeError(Isolate* isolate, int message_id, int byte_offset,
bool patch_source_position) {
HandleScope scope(isolate);
DCHECK_NULL(isolate->context());
isolate->set_context(GetWasmContextOnStackTop(isolate));
Handle<Object> error_obj = isolate->factory()->NewWasmRuntimeError(
static_cast<MessageTemplate::Template>(message_id));
if (!patch_source_position) {
return isolate->Throw(*error_obj);
}
// For wasm traps, the byte offset (a.k.a source position) can not be
// determined from relocation info, since the explicit checks for traps
// converge in one singe block which calls this runtime function.
// We hence pass the byte offset explicitely, and patch it into the top-most
// frame (a wasm frame) on the collected stack trace.
// TODO(wasm): This implementation is temporary, see bug #5007:
// https://bugs.chromium.org/p/v8/issues/detail?id=5007
Handle<JSObject> error = Handle<JSObject>::cast(error_obj);
Handle<Object> stack_trace_obj = JSReceiver::GetDataProperty(
error, isolate->factory()->stack_trace_symbol());
// Patch the stack trace (array of <receiver, function, code, position>).
if (stack_trace_obj->IsJSArray()) {
Handle<FrameArray> stack_elements(
FrameArray::cast(JSArray::cast(*stack_trace_obj)->elements()));
DCHECK(stack_elements->Code(0)->kind() == AbstractCode::WASM_FUNCTION);
DCHECK(stack_elements->Offset(0)->value() >= 0);
stack_elements->SetOffset(0, Smi::FromInt(-1 - byte_offset));
}
// Patch the detailed stack trace (array of JSObjects with various
// properties).
Handle<Object> detailed_stack_trace_obj = JSReceiver::GetDataProperty(
error, isolate->factory()->detailed_stack_trace_symbol());
if (detailed_stack_trace_obj->IsJSArray()) {
Handle<FixedArray> stack_elements(
FixedArray::cast(JSArray::cast(*detailed_stack_trace_obj)->elements()));
DCHECK_GE(stack_elements->length(), 1);
Handle<JSObject> top_frame(JSObject::cast(stack_elements->get(0)));
Handle<String> wasm_offset_key =
isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("column"));
LookupIterator it(top_frame, wasm_offset_key, top_frame,
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
if (it.IsFound()) {
DCHECK(JSReceiver::GetDataProperty(&it)->IsSmi());
// Make column number 1-based here.
Maybe<bool> data_set = JSReceiver::SetDataProperty(
&it, handle(Smi::FromInt(byte_offset + 1), isolate));
DCHECK(data_set.IsJust() && data_set.FromJust() == true);
USE(data_set);
}
}
return isolate->Throw(*error_obj);
}
RUNTIME_FUNCTION(Runtime_ThrowWasmErrorFromTrapIf) {
DCHECK_EQ(1, args.length());
CONVERT_SMI_ARG_CHECKED(message_id, 0);
return ThrowRuntimeError(isolate, message_id, 0, false);
}
RUNTIME_FUNCTION(Runtime_ThrowWasmError) {
DCHECK_EQ(2, args.length());
CONVERT_SMI_ARG_CHECKED(message_id, 0);
CONVERT_SMI_ARG_CHECKED(byte_offset, 1);
return ThrowRuntimeError(isolate, message_id, byte_offset, true);
}
RUNTIME_FUNCTION(Runtime_WasmThrowTypeError) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kWasmTrapTypeError));
}
RUNTIME_FUNCTION(Runtime_WasmThrow) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_SMI_ARG_CHECKED(lower, 0);
CONVERT_SMI_ARG_CHECKED(upper, 1);
const int32_t thrown_value = (upper << 16) | lower;
// Set the current isolate's context.
DCHECK_NULL(isolate->context());
isolate->set_context(GetWasmContextOnStackTop(isolate));
return isolate->Throw(*isolate->factory()->NewNumberFromInt(thrown_value));
}
RUNTIME_FUNCTION(Runtime_WasmGetCaughtExceptionValue) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
Object* exception = args[0];
// The unwinder will only deliver exceptions to wasm if the exception is a
// Number or a Smi (which we have just converted to a Number.) This logic
// lives in Isolate::is_catchable_by_wasm(Object*).
CHECK(exception->IsNumber());
return exception;
}
RUNTIME_FUNCTION(Runtime_WasmRunInterpreter) {
DCHECK_EQ(3, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(JSObject, instance_obj, 0);
CONVERT_NUMBER_CHECKED(int32_t, func_index, Int32, args[1]);
CONVERT_ARG_HANDLE_CHECKED(Object, arg_buffer_obj, 2);
CHECK(WasmInstanceObject::IsWasmInstanceObject(*instance_obj));
Handle<WasmInstanceObject> instance =
Handle<WasmInstanceObject>::cast(instance_obj);
// The arg buffer is the raw pointer to the caller's stack. It looks like a
// Smi (lowest bit not set, as checked by IsSmi), but is no valid Smi. We just
// cast it back to the raw pointer.
CHECK(!arg_buffer_obj->IsHeapObject());
CHECK(arg_buffer_obj->IsSmi());
uint8_t* arg_buffer = reinterpret_cast<uint8_t*>(*arg_buffer_obj);
// Set the current isolate's context.
DCHECK_NULL(isolate->context());
isolate->set_context(instance->compiled_module()->ptr_to_native_context());
instance->debug_info()->RunInterpreter(func_index, arg_buffer);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_WasmStackGuard) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
// Set the current isolate's context.
DCHECK_NULL(isolate->context());
isolate->set_context(GetWasmContextOnStackTop(isolate));
// Check if this is a real stack overflow.
StackLimitCheck check(isolate);
if (check.JsHasOverflowed()) return isolate->StackOverflow();
return isolate->stack_guard()->HandleInterrupts();
}
} // namespace internal
} // namespace v8
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