| // Copyright 2017 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/baseline/liftoff-assembler.h" |
| |
| #include "src/assembler-inl.h" |
| #include "src/base/optional.h" |
| #include "src/compiler/linkage.h" |
| #include "src/compiler/wasm-compiler.h" |
| #include "src/counters.h" |
| #include "src/macro-assembler-inl.h" |
| #include "src/wasm/function-body-decoder-impl.h" |
| #include "src/wasm/memory-tracing.h" |
| #include "src/wasm/wasm-objects.h" |
| #include "src/wasm/wasm-opcodes.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace wasm { |
| |
| constexpr auto kRegister = LiftoffAssembler::VarState::kRegister; |
| constexpr auto kI32Const = LiftoffAssembler::VarState::kI32Const; |
| constexpr auto kStack = LiftoffAssembler::VarState::kStack; |
| |
| namespace { |
| |
| #define __ asm_-> |
| |
| #define TRACE(...) \ |
| do { \ |
| if (FLAG_trace_liftoff) PrintF("[liftoff] " __VA_ARGS__); \ |
| } while (false) |
| |
| #if V8_TARGET_ARCH_ARM64 |
| // On ARM64, the Assembler keeps track of pointers to Labels to resolve |
| // branches to distant targets. Moving labels would confuse the Assembler, |
| // thus store the label on the heap and keep a unique_ptr. |
| class MovableLabel { |
| public: |
| Label* get() { return label_.get(); } |
| MovableLabel() : MovableLabel(new Label()) {} |
| |
| static MovableLabel None() { return MovableLabel(nullptr); } |
| |
| private: |
| std::unique_ptr<Label> label_; |
| explicit MovableLabel(Label* label) : label_(label) {} |
| }; |
| #else |
| // On all other platforms, just store the Label directly. |
| class MovableLabel { |
| public: |
| Label* get() { return &label_; } |
| |
| static MovableLabel None() { return MovableLabel(); } |
| |
| private: |
| Label label_; |
| }; |
| #endif |
| |
| class LiftoffCompiler { |
| public: |
| MOVE_ONLY_NO_DEFAULT_CONSTRUCTOR(LiftoffCompiler); |
| |
| // TODO(clemensh): Make this a template parameter. |
| static constexpr wasm::Decoder::ValidateFlag validate = |
| wasm::Decoder::kValidate; |
| |
| using Value = ValueBase; |
| |
| struct ElseState { |
| MovableLabel label; |
| LiftoffAssembler::CacheState state; |
| }; |
| |
| struct Control : public ControlWithNamedConstructors<Control, Value> { |
| MOVE_ONLY_WITH_DEFAULT_CONSTRUCTORS(Control); |
| |
| std::unique_ptr<ElseState> else_state; |
| LiftoffAssembler::CacheState label_state; |
| MovableLabel label; |
| }; |
| |
| using Decoder = WasmFullDecoder<validate, LiftoffCompiler>; |
| |
| struct OutOfLineCode { |
| MovableLabel label; |
| MovableLabel continuation; |
| Builtins::Name builtin; |
| wasm::WasmCodePosition position; |
| LiftoffRegList regs_to_save; |
| uint32_t pc; // for trap handler. |
| |
| // Named constructors: |
| static OutOfLineCode Trap(Builtins::Name b, wasm::WasmCodePosition pos, |
| uint32_t pc) { |
| return {{}, {}, b, pos, {}, pc}; |
| } |
| static OutOfLineCode StackCheck(wasm::WasmCodePosition pos, |
| LiftoffRegList regs) { |
| return {{}, MovableLabel::None(), Builtins::kWasmStackGuard, pos, regs, |
| 0}; |
| } |
| }; |
| |
| LiftoffCompiler(LiftoffAssembler* liftoff_asm, |
| compiler::CallDescriptor* call_desc, compiler::ModuleEnv* env, |
| compiler::RuntimeExceptionSupport runtime_exception_support, |
| SourcePositionTableBuilder* source_position_table_builder, |
| std::vector<trap_handler::ProtectedInstructionData>* |
| protected_instructions, |
| Zone* compilation_zone, std::unique_ptr<Zone>* codegen_zone) |
| : asm_(liftoff_asm), |
| call_desc_(call_desc), |
| env_(env), |
| min_size_(env_->module->initial_pages * wasm::kWasmPageSize), |
| max_size_((env_->module->has_maximum_pages |
| ? env_->module->maximum_pages |
| : wasm::kV8MaxWasmMemoryPages) * |
| wasm::kWasmPageSize), |
| runtime_exception_support_(runtime_exception_support), |
| source_position_table_builder_(source_position_table_builder), |
| protected_instructions_(protected_instructions), |
| compilation_zone_(compilation_zone), |
| codegen_zone_(codegen_zone), |
| safepoint_table_builder_(compilation_zone_) { |
| // Check for overflow in max_size_. |
| DCHECK_EQ(max_size_, uint64_t{env_->module->has_maximum_pages |
| ? env_->module->maximum_pages |
| : wasm::kV8MaxWasmMemoryPages} * |
| wasm::kWasmPageSize); |
| } |
| |
| bool ok() const { return ok_; } |
| |
| void unsupported(Decoder* decoder, const char* reason) { |
| ok_ = false; |
| TRACE("unsupported: %s\n", reason); |
| decoder->errorf(decoder->pc(), "unsupported liftoff operation: %s", reason); |
| BindUnboundLabels(decoder); |
| } |
| |
| int GetSafepointTableOffset() const { |
| return safepoint_table_builder_.GetCodeOffset(); |
| } |
| |
| void BindUnboundLabels(Decoder* decoder) { |
| #ifdef DEBUG |
| // Bind all labels now, otherwise their destructor will fire a DCHECK error |
| // if they where referenced before. |
| for (uint32_t i = 0, e = decoder->control_depth(); i < e; ++i) { |
| Control* c = decoder->control_at(i); |
| Label* label = c->label.get(); |
| if (!label->is_bound()) __ bind(label); |
| if (c->else_state) { |
| Label* else_label = c->else_state->label.get(); |
| if (!else_label->is_bound()) __ bind(else_label); |
| } |
| } |
| for (auto& ool : out_of_line_code_) { |
| if (!ool.label.get()->is_bound()) __ bind(ool.label.get()); |
| } |
| #endif |
| } |
| |
| void CheckStackSizeLimit(Decoder* decoder) { |
| DCHECK_GE(__ cache_state()->stack_height(), __ num_locals()); |
| int stack_height = __ cache_state()->stack_height() - __ num_locals(); |
| if (stack_height > LiftoffAssembler::kMaxValueStackHeight) { |
| unsupported(decoder, "value stack grows too large"); |
| } |
| } |
| |
| void StartFunction(Decoder* decoder) { |
| int num_locals = decoder->NumLocals(); |
| __ set_num_locals(num_locals); |
| for (int i = 0; i < num_locals; ++i) { |
| __ set_local_type(i, decoder->GetLocalType(i)); |
| } |
| } |
| |
| void ProcessParameter(uint32_t param_idx, uint32_t input_location) { |
| ValueType type = __ local_type(param_idx); |
| RegClass rc = reg_class_for(type); |
| compiler::LinkageLocation param_loc = |
| call_desc_->GetInputLocation(input_location); |
| if (param_loc.IsRegister()) { |
| DCHECK(!param_loc.IsAnyRegister()); |
| int reg_code = param_loc.AsRegister(); |
| LiftoffRegister reg = |
| rc == kGpReg ? LiftoffRegister(Register::from_code(reg_code)) |
| : LiftoffRegister(DoubleRegister::from_code(reg_code)); |
| LiftoffRegList cache_regs = |
| rc == kGpReg ? kGpCacheRegList : kFpCacheRegList; |
| if (cache_regs.has(reg)) { |
| // This is a cache register, just use it. |
| __ PushRegister(type, reg); |
| return; |
| } |
| // Move to a cache register. |
| LiftoffRegister cache_reg = __ GetUnusedRegister(rc); |
| __ Move(cache_reg, reg); |
| __ PushRegister(type, reg); |
| return; |
| } |
| if (param_loc.IsCallerFrameSlot()) { |
| LiftoffRegister tmp_reg = __ GetUnusedRegister(rc); |
| __ LoadCallerFrameSlot(tmp_reg, -param_loc.AsCallerFrameSlot()); |
| __ PushRegister(type, tmp_reg); |
| return; |
| } |
| UNREACHABLE(); |
| } |
| |
| void StackCheck(wasm::WasmCodePosition position) { |
| if (FLAG_wasm_no_stack_checks || !runtime_exception_support_) return; |
| out_of_line_code_.push_back( |
| OutOfLineCode::StackCheck(position, __ cache_state()->used_registers)); |
| OutOfLineCode& ool = out_of_line_code_.back(); |
| __ StackCheck(ool.label.get()); |
| __ bind(ool.continuation.get()); |
| } |
| |
| void StartFunctionBody(Decoder* decoder, Control* block) { |
| if (!kLiftoffAssemblerImplementedOnThisPlatform) { |
| unsupported(decoder, "platform"); |
| return; |
| } |
| __ EnterFrame(StackFrame::WASM_COMPILED); |
| __ set_has_frame(true); |
| __ ReserveStackSpace(LiftoffAssembler::kStackSlotSize * |
| __ GetTotalFrameSlotCount()); |
| // Parameter 0 is the wasm context. |
| uint32_t num_params = |
| static_cast<uint32_t>(call_desc_->ParameterCount()) - 1; |
| for (uint32_t i = 0; i < __ num_locals(); ++i) { |
| switch (__ local_type(i)) { |
| case kWasmI32: |
| case kWasmF32: |
| // supported. |
| break; |
| case kWasmI64: |
| unsupported(decoder, "i64 param/local"); |
| return; |
| case kWasmF64: |
| unsupported(decoder, "f64 param/local"); |
| return; |
| default: |
| unsupported(decoder, "exotic param/local"); |
| return; |
| } |
| } |
| // Input 0 is the call target, the context is at 1. |
| constexpr int kContextParameterIndex = 1; |
| // Store the context parameter to a special stack slot. |
| compiler::LinkageLocation context_loc = |
| call_desc_->GetInputLocation(kContextParameterIndex); |
| DCHECK(context_loc.IsRegister()); |
| DCHECK(!context_loc.IsAnyRegister()); |
| Register context_reg = Register::from_code(context_loc.AsRegister()); |
| __ SpillContext(context_reg); |
| uint32_t param_idx = 0; |
| for (; param_idx < num_params; ++param_idx) { |
| constexpr int kFirstActualParameterIndex = kContextParameterIndex + 1; |
| ProcessParameter(param_idx, param_idx + kFirstActualParameterIndex); |
| } |
| // Set to a gp register, to mark this uninitialized. |
| LiftoffRegister zero_double_reg(Register::from_code<0>()); |
| DCHECK(zero_double_reg.is_gp()); |
| for (; param_idx < __ num_locals(); ++param_idx) { |
| ValueType type = decoder->GetLocalType(param_idx); |
| switch (type) { |
| case kWasmI32: |
| __ cache_state()->stack_state.emplace_back(kWasmI32, uint32_t{0}); |
| break; |
| case kWasmF32: |
| if (zero_double_reg.is_gp()) { |
| // Note: This might spill one of the registers used to hold |
| // parameters. |
| zero_double_reg = __ GetUnusedRegister(kFpReg); |
| __ LoadConstant(zero_double_reg, WasmValue(0.f)); |
| } |
| __ PushRegister(kWasmF32, zero_double_reg); |
| break; |
| default: |
| UNIMPLEMENTED(); |
| } |
| } |
| block->label_state.stack_base = __ num_locals(); |
| |
| // The function-prologue stack check is associated with position 0, which |
| // is never a position of any instruction in the function. |
| StackCheck(0); |
| |
| DCHECK_EQ(__ num_locals(), param_idx); |
| DCHECK_EQ(__ num_locals(), __ cache_state()->stack_height()); |
| CheckStackSizeLimit(decoder); |
| } |
| |
| void GenerateOutOfLineCode(OutOfLineCode& ool) { |
| __ bind(ool.label.get()); |
| const bool is_stack_check = ool.builtin == Builtins::kWasmStackGuard; |
| if (!runtime_exception_support_) { |
| // We cannot test calls to the runtime in cctest/test-run-wasm. |
| // Therefore we emit a call to C here instead of a call to the runtime. |
| // In this mode, we never generate stack checks. |
| DCHECK(!is_stack_check); |
| __ CallTrapCallbackForTesting(); |
| __ LeaveFrame(StackFrame::WASM_COMPILED); |
| __ Ret(); |
| return; |
| } |
| |
| if (!is_stack_check && env_->use_trap_handler) { |
| uint32_t pc = static_cast<uint32_t>(__ pc_offset()); |
| DCHECK_EQ(pc, __ pc_offset()); |
| protected_instructions_->emplace_back( |
| trap_handler::ProtectedInstructionData{ool.pc, pc}); |
| } |
| |
| if (!ool.regs_to_save.is_empty()) __ PushRegisters(ool.regs_to_save); |
| |
| source_position_table_builder_->AddPosition( |
| __ pc_offset(), SourcePosition(ool.position), false); |
| __ Call(__ isolate()->builtins()->builtin_handle(ool.builtin), |
| RelocInfo::CODE_TARGET); |
| safepoint_table_builder_.DefineSafepoint(asm_, Safepoint::kSimple, 0, |
| Safepoint::kNoLazyDeopt); |
| DCHECK_EQ(ool.continuation.get()->is_bound(), is_stack_check); |
| if (!ool.regs_to_save.is_empty()) __ PopRegisters(ool.regs_to_save); |
| if (is_stack_check) { |
| __ emit_jump(ool.continuation.get()); |
| } else { |
| __ AssertUnreachable(AbortReason::kUnexpectedReturnFromWasmTrap); |
| } |
| } |
| |
| void FinishFunction(Decoder* decoder) { |
| for (OutOfLineCode& ool : out_of_line_code_) { |
| GenerateOutOfLineCode(ool); |
| } |
| safepoint_table_builder_.Emit(asm_, __ GetTotalFrameSlotCount()); |
| } |
| |
| void OnFirstError(Decoder* decoder) { |
| ok_ = false; |
| BindUnboundLabels(decoder); |
| } |
| |
| void NextInstruction(Decoder* decoder, WasmOpcode) { |
| TraceCacheState(decoder); |
| } |
| |
| void Block(Decoder* decoder, Control* block) { |
| block->label_state.stack_base = __ cache_state()->stack_height(); |
| } |
| |
| void Loop(Decoder* decoder, Control* loop) { |
| loop->label_state.stack_base = __ cache_state()->stack_height(); |
| |
| // Before entering a loop, spill all locals to the stack, in order to free |
| // the cache registers, and to avoid unnecessarily reloading stack values |
| // into registers at branches. |
| // TODO(clemensh): Come up with a better strategy here, involving |
| // pre-analysis of the function. |
| __ SpillLocals(); |
| |
| // Loop labels bind at the beginning of the block. |
| __ bind(loop->label.get()); |
| |
| // Save the current cache state for the merge when jumping to this loop. |
| loop->label_state.Split(*__ cache_state()); |
| |
| // Execute a stack check in the loop header. |
| StackCheck(decoder->position()); |
| } |
| |
| void Try(Decoder* decoder, Control* block) { unsupported(decoder, "try"); } |
| |
| void If(Decoder* decoder, const Value& cond, Control* if_block) { |
| DCHECK_EQ(if_block, decoder->control_at(0)); |
| DCHECK(if_block->is_if()); |
| |
| if (if_block->start_merge.arity > 0 || if_block->end_merge.arity > 1) |
| return unsupported(decoder, "multi-value if"); |
| |
| // Allocate the else state. |
| if_block->else_state = base::make_unique<ElseState>(); |
| |
| // Test the condition, jump to else if zero. |
| Register value = __ PopToRegister(kGpReg).gp(); |
| __ emit_i32_test(value); |
| __ emit_cond_jump(kEqual, if_block->else_state->label.get()); |
| |
| if_block->label_state.stack_base = __ cache_state()->stack_height(); |
| // Store the state (after popping the value) for executing the else branch. |
| if_block->else_state->state.Split(*__ cache_state()); |
| } |
| |
| void FallThruTo(Decoder* decoder, Control* c) { |
| if (c->end_merge.reached) { |
| __ MergeFullStackWith(c->label_state); |
| } else if (c->is_onearmed_if()) { |
| c->label_state.InitMerge(*__ cache_state(), __ num_locals(), |
| c->br_merge()->arity); |
| __ MergeFullStackWith(c->label_state); |
| } else { |
| c->label_state.Split(*__ cache_state()); |
| } |
| TraceCacheState(decoder); |
| } |
| |
| void PopControl(Decoder* decoder, Control* c) { |
| if (!c->is_loop() && c->end_merge.reached) { |
| __ cache_state()->Steal(c->label_state); |
| } |
| if (!c->label.get()->is_bound()) { |
| __ bind(c->label.get()); |
| } |
| } |
| |
| void EndControl(Decoder* decoder, Control* c) {} |
| |
| void GenerateCCall(Register res_reg, uint32_t num_args, |
| const Register* arg_regs, ExternalReference ext_ref) { |
| static constexpr int kNumReturns = 1; |
| static constexpr int kMaxArgs = 2; |
| static constexpr MachineType kReps[]{ |
| MachineType::Uint32(), MachineType::Pointer(), MachineType::Pointer()}; |
| static_assert(arraysize(kReps) == kNumReturns + kMaxArgs, "mismatch"); |
| DCHECK_LE(num_args, kMaxArgs); |
| |
| MachineSignature sig(kNumReturns, num_args, kReps); |
| compiler::CallDescriptor* desc = |
| compiler::Linkage::GetSimplifiedCDescriptor(compilation_zone_, &sig); |
| |
| // Before making a call, spill all cache registers. |
| __ SpillAllRegisters(); |
| |
| // Store arguments on our stack, then align the stack for calling to C. |
| uint32_t num_params = static_cast<uint32_t>(desc->ParameterCount()); |
| __ PrepareCCall(num_params, arg_regs); |
| |
| // Set parameters (in sp[0], sp[8], ...). |
| uint32_t num_stack_params = 0; |
| for (uint32_t param = 0; param < num_params; ++param) { |
| constexpr size_t kInputShift = 1; // Input 0 is the call target. |
| |
| compiler::LinkageLocation loc = |
| desc->GetInputLocation(param + kInputShift); |
| if (loc.IsRegister()) { |
| Register reg = Register::from_code(loc.AsRegister()); |
| // Load address of that parameter to the register. |
| __ SetCCallRegParamAddr(reg, param, num_params); |
| } else { |
| DCHECK(loc.IsCallerFrameSlot()); |
| __ SetCCallStackParamAddr(num_stack_params, param, num_params); |
| ++num_stack_params; |
| } |
| } |
| |
| // Now execute the call. |
| __ CallC(ext_ref, num_params); |
| |
| // Load return value. |
| compiler::LinkageLocation return_loc = desc->GetReturnLocation(0); |
| DCHECK(return_loc.IsRegister()); |
| Register return_reg = Register::from_code(return_loc.AsRegister()); |
| if (return_reg != res_reg) { |
| __ Move(LiftoffRegister(res_reg), LiftoffRegister(return_reg)); |
| } |
| } |
| |
| void I32UnOp(bool (LiftoffAssembler::*emit_fn)(Register, Register), |
| ExternalReference (*fallback_fn)(Isolate*)) { |
| LiftoffRegList pinned; |
| LiftoffRegister dst_reg = pinned.set(__ GetUnaryOpTargetRegister(kGpReg)); |
| LiftoffRegister src_reg = pinned.set(__ PopToRegister(kGpReg, pinned)); |
| if (!emit_fn || !(asm_->*emit_fn)(dst_reg.gp(), src_reg.gp())) { |
| ExternalReference ext_ref = fallback_fn(asm_->isolate()); |
| Register args[] = {src_reg.gp()}; |
| GenerateCCall(dst_reg.gp(), arraysize(args), args, ext_ref); |
| } |
| __ PushRegister(kWasmI32, dst_reg); |
| } |
| |
| void UnOp(Decoder* decoder, WasmOpcode opcode, FunctionSig*, |
| const Value& value, Value* result) { |
| #define CASE_UNOP(opcode, type, fn, ext_ref_fn) \ |
| case WasmOpcode::kExpr##opcode: \ |
| type##UnOp(&LiftoffAssembler::emit_##fn, ext_ref_fn); \ |
| break; |
| switch (opcode) { |
| CASE_UNOP(I32Eqz, I32, i32_eqz, nullptr) |
| CASE_UNOP(I32Clz, I32, i32_clz, nullptr) |
| CASE_UNOP(I32Ctz, I32, i32_ctz, nullptr) |
| CASE_UNOP(I32Popcnt, I32, i32_popcnt, |
| &ExternalReference::wasm_word32_popcnt) |
| default: |
| return unsupported(decoder, WasmOpcodes::OpcodeName(opcode)); |
| } |
| #undef CASE_UNOP |
| } |
| |
| void I32BinOp(void (LiftoffAssembler::*emit_fn)(Register, Register, |
| Register)) { |
| LiftoffRegList pinned; |
| LiftoffRegister dst_reg = pinned.set(__ GetBinaryOpTargetRegister(kGpReg)); |
| LiftoffRegister rhs_reg = pinned.set(__ PopToRegister(kGpReg, pinned)); |
| LiftoffRegister lhs_reg = __ PopToRegister(kGpReg, pinned); |
| (asm_->*emit_fn)(dst_reg.gp(), lhs_reg.gp(), rhs_reg.gp()); |
| __ PushRegister(kWasmI32, dst_reg); |
| } |
| |
| void I32CCallBinOp(ExternalReference ext_ref) { |
| LiftoffRegList pinned; |
| LiftoffRegister dst_reg = pinned.set(__ GetBinaryOpTargetRegister(kGpReg)); |
| LiftoffRegister rhs_reg = pinned.set(__ PopToRegister(kGpReg, pinned)); |
| LiftoffRegister lhs_reg = __ PopToRegister(kGpReg, pinned); |
| Register args[] = {lhs_reg.gp(), rhs_reg.gp()}; |
| GenerateCCall(dst_reg.gp(), arraysize(args), args, ext_ref); |
| __ PushRegister(kWasmI32, dst_reg); |
| } |
| |
| void F32BinOp(void (LiftoffAssembler::*emit_fn)(DoubleRegister, |
| DoubleRegister, |
| DoubleRegister)) { |
| LiftoffRegList pinned; |
| LiftoffRegister target_reg = |
| pinned.set(__ GetBinaryOpTargetRegister(kFpReg)); |
| LiftoffRegister rhs_reg = pinned.set(__ PopToRegister(kFpReg, pinned)); |
| LiftoffRegister lhs_reg = __ PopToRegister(kFpReg, pinned); |
| (asm_->*emit_fn)(target_reg.fp(), lhs_reg.fp(), rhs_reg.fp()); |
| __ PushRegister(kWasmF32, target_reg); |
| } |
| |
| void BinOp(Decoder* decoder, WasmOpcode opcode, FunctionSig*, |
| const Value& lhs, const Value& rhs, Value* result) { |
| #define CASE_BINOP(opcode, type, fn) \ |
| case WasmOpcode::kExpr##opcode: \ |
| return type##BinOp(&LiftoffAssembler::emit_##fn); |
| #define CASE_CCALL_BINOP(opcode, type, ext_ref_fn) \ |
| case WasmOpcode::kExpr##opcode: \ |
| type##CCallBinOp(ExternalReference::ext_ref_fn(asm_->isolate())); \ |
| break; |
| switch (opcode) { |
| CASE_BINOP(I32Add, I32, i32_add) |
| CASE_BINOP(I32Sub, I32, i32_sub) |
| CASE_BINOP(I32Mul, I32, i32_mul) |
| CASE_BINOP(I32And, I32, i32_and) |
| CASE_BINOP(I32Ior, I32, i32_or) |
| CASE_BINOP(I32Xor, I32, i32_xor) |
| CASE_BINOP(I32Shl, I32, i32_shl) |
| CASE_BINOP(I32ShrS, I32, i32_sar) |
| CASE_BINOP(I32ShrU, I32, i32_shr) |
| CASE_CCALL_BINOP(I32Rol, I32, wasm_word32_rol) |
| CASE_CCALL_BINOP(I32Ror, I32, wasm_word32_ror) |
| CASE_BINOP(F32Add, F32, f32_add) |
| CASE_BINOP(F32Sub, F32, f32_sub) |
| CASE_BINOP(F32Mul, F32, f32_mul) |
| default: |
| return unsupported(decoder, WasmOpcodes::OpcodeName(opcode)); |
| } |
| #undef CASE_BINOP |
| #undef CASE_CCALL_BINOP |
| } |
| |
| void I32Const(Decoder* decoder, Value* result, int32_t value) { |
| __ cache_state()->stack_state.emplace_back(kWasmI32, value); |
| CheckStackSizeLimit(decoder); |
| } |
| |
| void I64Const(Decoder* decoder, Value* result, int64_t value) { |
| unsupported(decoder, "i64.const"); |
| } |
| |
| void F32Const(Decoder* decoder, Value* result, float value) { |
| LiftoffRegister reg = __ GetUnusedRegister(kFpReg); |
| __ LoadConstant(reg, WasmValue(value)); |
| __ PushRegister(kWasmF32, reg); |
| CheckStackSizeLimit(decoder); |
| } |
| |
| void F64Const(Decoder* decoder, Value* result, double value) { |
| unsupported(decoder, "f64.const"); |
| } |
| |
| void Drop(Decoder* decoder, const Value& value) { |
| __ DropStackSlot(&__ cache_state()->stack_state.back()); |
| __ cache_state()->stack_state.pop_back(); |
| } |
| |
| void DoReturn(Decoder* decoder, Vector<Value> values, bool implicit) { |
| if (implicit) { |
| DCHECK_EQ(1, decoder->control_depth()); |
| Control* func_block = decoder->control_at(0); |
| __ bind(func_block->label.get()); |
| __ cache_state()->Steal(func_block->label_state); |
| } |
| if (!values.is_empty()) { |
| if (values.size() > 1) return unsupported(decoder, "multi-return"); |
| RegClass rc = reg_class_for(values[0].type); |
| LiftoffRegister reg = __ PopToRegister(rc); |
| __ MoveToReturnRegister(reg); |
| } |
| __ LeaveFrame(StackFrame::WASM_COMPILED); |
| __ DropStackSlotsAndRet( |
| static_cast<uint32_t>(call_desc_->StackParameterCount())); |
| } |
| |
| void GetLocal(Decoder* decoder, Value* result, |
| const LocalIndexOperand<validate>& operand) { |
| auto& slot = __ cache_state()->stack_state[operand.index]; |
| DCHECK_EQ(slot.type(), operand.type); |
| switch (slot.loc()) { |
| case kRegister: |
| __ PushRegister(slot.type(), slot.reg()); |
| break; |
| case kI32Const: |
| __ cache_state()->stack_state.emplace_back(operand.type, |
| slot.i32_const()); |
| break; |
| case kStack: { |
| auto rc = reg_class_for(operand.type); |
| LiftoffRegister reg = __ GetUnusedRegister(rc); |
| __ Fill(reg, operand.index); |
| __ PushRegister(slot.type(), reg); |
| break; |
| } |
| } |
| CheckStackSizeLimit(decoder); |
| } |
| |
| void SetLocalFromStackSlot(LiftoffAssembler::VarState& dst_slot, |
| uint32_t local_index) { |
| auto& state = *__ cache_state(); |
| if (dst_slot.is_reg()) { |
| LiftoffRegister slot_reg = dst_slot.reg(); |
| if (state.get_use_count(slot_reg) == 1) { |
| __ Fill(dst_slot.reg(), state.stack_height() - 1); |
| return; |
| } |
| state.dec_used(slot_reg); |
| } |
| ValueType type = dst_slot.type(); |
| DCHECK_EQ(type, __ local_type(local_index)); |
| RegClass rc = reg_class_for(type); |
| LiftoffRegister dst_reg = __ GetUnusedRegister(rc); |
| __ Fill(dst_reg, __ cache_state()->stack_height() - 1); |
| dst_slot = LiftoffAssembler::VarState(type, dst_reg); |
| __ cache_state()->inc_used(dst_reg); |
| } |
| |
| void SetLocal(uint32_t local_index, bool is_tee) { |
| auto& state = *__ cache_state(); |
| auto& source_slot = state.stack_state.back(); |
| auto& target_slot = state.stack_state[local_index]; |
| switch (source_slot.loc()) { |
| case kRegister: |
| __ DropStackSlot(&target_slot); |
| target_slot = source_slot; |
| if (is_tee) state.inc_used(target_slot.reg()); |
| break; |
| case kI32Const: |
| __ DropStackSlot(&target_slot); |
| target_slot = source_slot; |
| break; |
| case kStack: |
| SetLocalFromStackSlot(target_slot, local_index); |
| break; |
| } |
| if (!is_tee) __ cache_state()->stack_state.pop_back(); |
| } |
| |
| void SetLocal(Decoder* decoder, const Value& value, |
| const LocalIndexOperand<validate>& operand) { |
| SetLocal(operand.index, false); |
| } |
| |
| void TeeLocal(Decoder* decoder, const Value& value, Value* result, |
| const LocalIndexOperand<validate>& operand) { |
| SetLocal(operand.index, true); |
| } |
| |
| void GetGlobal(Decoder* decoder, Value* result, |
| const GlobalIndexOperand<validate>& operand) { |
| const auto* global = &env_->module->globals[operand.index]; |
| if (global->type != kWasmI32 && global->type != kWasmI64) |
| return unsupported(decoder, "non-int global"); |
| LiftoffRegList pinned; |
| Register addr = pinned.set(__ GetUnusedRegister(kGpReg)).gp(); |
| __ LoadFromContext(addr, offsetof(WasmContext, globals_start), |
| kPointerSize); |
| LiftoffRegister value = |
| pinned.set(__ GetUnusedRegister(reg_class_for(global->type), pinned)); |
| LoadType type = |
| global->type == kWasmI32 ? LoadType::kI32Load : LoadType::kI64Load; |
| if (type.size() > kPointerSize) |
| return unsupported(decoder, "global > kPointerSize"); |
| __ Load(value, addr, no_reg, global->offset, type, pinned); |
| __ PushRegister(global->type, value); |
| CheckStackSizeLimit(decoder); |
| } |
| |
| void SetGlobal(Decoder* decoder, const Value& value, |
| const GlobalIndexOperand<validate>& operand) { |
| auto* global = &env_->module->globals[operand.index]; |
| if (global->type != kWasmI32) return unsupported(decoder, "non-i32 global"); |
| LiftoffRegList pinned; |
| Register addr = pinned.set(__ GetUnusedRegister(kGpReg)).gp(); |
| __ LoadFromContext(addr, offsetof(WasmContext, globals_start), |
| kPointerSize); |
| LiftoffRegister reg = |
| pinned.set(__ PopToRegister(reg_class_for(global->type), pinned)); |
| StoreType type = |
| global->type == kWasmI32 ? StoreType::kI32Store : StoreType::kI64Store; |
| __ Store(addr, no_reg, global->offset, reg, type, pinned); |
| } |
| |
| void Unreachable(Decoder* decoder) { unsupported(decoder, "unreachable"); } |
| |
| void Select(Decoder* decoder, const Value& cond, const Value& fval, |
| const Value& tval, Value* result) { |
| unsupported(decoder, "select"); |
| } |
| |
| void Br(Control* target) { |
| if (!target->br_merge()->reached) { |
| target->label_state.InitMerge(*__ cache_state(), __ num_locals(), |
| target->br_merge()->arity); |
| } |
| __ MergeStackWith(target->label_state, target->br_merge()->arity); |
| __ jmp(target->label.get()); |
| } |
| |
| void Br(Decoder* decoder, Control* target) { |
| Br(target); |
| } |
| |
| void BrIf(Decoder* decoder, const Value& cond, Control* target) { |
| Label cont_false; |
| Register value = __ PopToRegister(kGpReg).gp(); |
| __ emit_i32_test(value); |
| __ emit_cond_jump(kEqual, &cont_false); |
| |
| Br(target); |
| __ bind(&cont_false); |
| } |
| |
| void BrTable(Decoder* decoder, const BranchTableOperand<validate>& operand, |
| const Value& key) { |
| unsupported(decoder, "br_table"); |
| } |
| |
| void Else(Decoder* decoder, Control* if_block) { |
| if (if_block->reachable()) __ emit_jump(if_block->label.get()); |
| __ bind(if_block->else_state->label.get()); |
| __ cache_state()->Steal(if_block->else_state->state); |
| } |
| |
| Label* AddOutOfLineTrap(wasm::WasmCodePosition position, uint32_t pc = 0) { |
| DCHECK(!FLAG_wasm_no_bounds_checks); |
| // The pc is needed exactly if trap handlers are enabled. |
| DCHECK_EQ(pc != 0, env_->use_trap_handler); |
| |
| out_of_line_code_.push_back(OutOfLineCode::Trap( |
| Builtins::kThrowWasmTrapMemOutOfBounds, position, pc)); |
| return out_of_line_code_.back().label.get(); |
| } |
| |
| void BoundsCheckMem(uint32_t access_size, uint32_t offset, Register index, |
| wasm::WasmCodePosition position, LiftoffRegList pinned) { |
| DCHECK(!env_->use_trap_handler); |
| if (FLAG_wasm_no_bounds_checks) return; |
| |
| Label* trap_label = AddOutOfLineTrap(position); |
| |
| if (access_size > max_size_ || offset > max_size_ - access_size) { |
| // The access will be out of bounds, even for the largest memory. |
| __ emit_jump(trap_label); |
| return; |
| } |
| uint32_t end_offset = offset + access_size - 1; |
| |
| // If the end offset is larger than the smallest memory, dynamically check |
| // the end offset against the actual memory size, which is not known at |
| // compile time. Otherwise, only one check is required (see below). |
| LiftoffRegister end_offset_reg = |
| pinned.set(__ GetUnusedRegister(kGpReg, pinned)); |
| LiftoffRegister mem_size = __ GetUnusedRegister(kGpReg, pinned); |
| __ LoadFromContext(mem_size.gp(), offsetof(WasmContext, mem_size), 4); |
| __ LoadConstant(end_offset_reg, WasmValue(end_offset)); |
| if (end_offset >= min_size_) { |
| __ emit_i32_compare(end_offset_reg.gp(), mem_size.gp()); |
| __ emit_cond_jump(kUnsignedGreaterEqual, trap_label); |
| } |
| |
| // Just reuse the end_offset register for computing the effective size. |
| LiftoffRegister effective_size_reg = end_offset_reg; |
| __ emit_i32_sub(effective_size_reg.gp(), mem_size.gp(), |
| end_offset_reg.gp()); |
| |
| __ emit_i32_compare(index, effective_size_reg.gp()); |
| __ emit_cond_jump(kUnsignedGreaterEqual, trap_label); |
| } |
| |
| void TraceMemoryOperation(bool is_store, MachineRepresentation rep, |
| Register index, uint32_t offset, |
| WasmCodePosition position) { |
| // Before making the runtime call, spill all cache registers. |
| __ SpillAllRegisters(); |
| |
| LiftoffRegList pinned = LiftoffRegList::ForRegs(index); |
| // Get one register for computing the address (offset + index). |
| LiftoffRegister address = pinned.set(__ GetUnusedRegister(kGpReg, pinned)); |
| // Compute offset+index in address. |
| __ LoadConstant(address, WasmValue(offset)); |
| __ emit_i32_add(address.gp(), address.gp(), index); |
| |
| // Get a register to hold the stack slot for wasm::MemoryTracingInfo. |
| LiftoffRegister info = pinned.set(__ GetUnusedRegister(kGpReg, pinned)); |
| // Allocate stack slot for wasm::MemoryTracingInfo. |
| __ AllocateStackSlot(info.gp(), sizeof(wasm::MemoryTracingInfo)); |
| |
| // Now store all information into the wasm::MemoryTracingInfo struct. |
| __ Store(info.gp(), no_reg, offsetof(wasm::MemoryTracingInfo, address), |
| address, StoreType::kI32Store, pinned); |
| __ LoadConstant(address, WasmValue(is_store ? 1 : 0)); |
| __ Store(info.gp(), no_reg, offsetof(wasm::MemoryTracingInfo, is_store), |
| address, StoreType::kI32Store8, pinned); |
| __ LoadConstant(address, WasmValue(static_cast<int>(rep))); |
| __ Store(info.gp(), no_reg, offsetof(wasm::MemoryTracingInfo, mem_rep), |
| address, StoreType::kI32Store8, pinned); |
| |
| source_position_table_builder_->AddPosition( |
| __ pc_offset(), SourcePosition(position), false); |
| |
| Register args[] = {info.gp()}; |
| GenerateRuntimeCall(arraysize(args), args); |
| } |
| |
| void GenerateRuntimeCall(int num_args, Register* args) { |
| compiler::CallDescriptor* desc = |
| compiler::Linkage::GetRuntimeCallDescriptor( |
| compilation_zone_, Runtime::kWasmTraceMemory, num_args, |
| compiler::Operator::kNoProperties, |
| compiler::CallDescriptor::kNoFlags); |
| // Currently, only one argument is supported. More arguments require some |
| // caution for the parallel register moves (reuse StackTransferRecipe). |
| DCHECK_EQ(1, num_args); |
| constexpr size_t kInputShift = 1; // Input 0 is the call target. |
| compiler::LinkageLocation param_loc = desc->GetInputLocation(kInputShift); |
| if (param_loc.IsRegister()) { |
| Register reg = Register::from_code(param_loc.AsRegister()); |
| __ Move(LiftoffRegister(reg), LiftoffRegister(args[0])); |
| } else { |
| DCHECK(param_loc.IsCallerFrameSlot()); |
| __ PushCallerFrameSlot(LiftoffRegister(args[0])); |
| } |
| |
| // Allocate the codegen zone if not done before. |
| if (!*codegen_zone_) { |
| codegen_zone_->reset( |
| new Zone(__ isolate()->allocator(), "LiftoffCodegenZone")); |
| } |
| __ CallRuntime(codegen_zone_->get(), Runtime::kWasmTraceMemory); |
| __ DeallocateStackSlot(sizeof(wasm::MemoryTracingInfo)); |
| } |
| |
| void LoadMem(Decoder* decoder, LoadType type, |
| const MemoryAccessOperand<validate>& operand, |
| const Value& index_val, Value* result) { |
| ValueType value_type = type.value_type(); |
| if (value_type != kWasmI32 && value_type != kWasmF32) |
| return unsupported(decoder, "unsupported load type"); |
| LiftoffRegList pinned; |
| Register index = pinned.set(__ PopToRegister(kGpReg)).gp(); |
| if (!env_->use_trap_handler) { |
| // Emit an explicit bounds check. |
| BoundsCheckMem(type.size(), operand.offset, index, decoder->position(), |
| pinned); |
| } |
| Register addr = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp(); |
| __ LoadFromContext(addr, offsetof(WasmContext, mem_start), kPointerSize); |
| RegClass rc = reg_class_for(value_type); |
| LiftoffRegister value = pinned.set(__ GetUnusedRegister(rc, pinned)); |
| uint32_t protected_load_pc = 0; |
| __ Load(value, addr, index, operand.offset, type, pinned, |
| &protected_load_pc); |
| if (env_->use_trap_handler) { |
| AddOutOfLineTrap(decoder->position(), protected_load_pc); |
| } |
| __ PushRegister(value_type, value); |
| CheckStackSizeLimit(decoder); |
| |
| if (FLAG_wasm_trace_memory) { |
| TraceMemoryOperation(false, type.mem_type().representation(), index, |
| operand.offset, decoder->position()); |
| } |
| } |
| |
| void StoreMem(Decoder* decoder, StoreType type, |
| const MemoryAccessOperand<validate>& operand, |
| const Value& index_val, const Value& value_val) { |
| ValueType value_type = type.value_type(); |
| if (value_type != kWasmI32 && value_type != kWasmF32) |
| return unsupported(decoder, "unsupported store type"); |
| RegClass rc = reg_class_for(value_type); |
| LiftoffRegList pinned; |
| LiftoffRegister value = pinned.set(__ PopToRegister(rc)); |
| Register index = pinned.set(__ PopToRegister(kGpReg, pinned)).gp(); |
| if (!env_->use_trap_handler) { |
| // Emit an explicit bounds check. |
| BoundsCheckMem(type.size(), operand.offset, index, decoder->position(), |
| pinned); |
| } |
| Register addr = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp(); |
| __ LoadFromContext(addr, offsetof(WasmContext, mem_start), kPointerSize); |
| uint32_t protected_store_pc = 0; |
| __ Store(addr, index, operand.offset, value, type, pinned, |
| &protected_store_pc); |
| if (env_->use_trap_handler) { |
| AddOutOfLineTrap(decoder->position(), protected_store_pc); |
| } |
| if (FLAG_wasm_trace_memory) { |
| TraceMemoryOperation(true, type.mem_rep(), index, operand.offset, |
| decoder->position()); |
| } |
| } |
| |
| void CurrentMemoryPages(Decoder* decoder, Value* result) { |
| unsupported(decoder, "current_memory"); |
| } |
| void GrowMemory(Decoder* decoder, const Value& value, Value* result) { |
| unsupported(decoder, "grow_memory"); |
| } |
| |
| void CallDirect(Decoder* decoder, |
| const CallFunctionOperand<validate>& operand, |
| const Value args[], Value returns[]) { |
| if (operand.sig->return_count() > 1) |
| return unsupported(decoder, "multi-return"); |
| |
| compiler::CallDescriptor* call_desc = |
| compiler::GetWasmCallDescriptor(compilation_zone_, operand.sig); |
| |
| __ PrepareCall(operand.sig, call_desc); |
| |
| source_position_table_builder_->AddPosition( |
| __ pc_offset(), SourcePosition(decoder->position()), false); |
| |
| if (FLAG_wasm_jit_to_native) { |
| // Just encode the function index. This will be patched at instantiation. |
| Address addr = reinterpret_cast<Address>(operand.index); |
| __ CallNativeWasmCode(addr); |
| } else { |
| Handle<Code> target = operand.index < env_->function_code.size() |
| ? env_->function_code[operand.index] |
| : env_->default_function_code; |
| __ Call(target, RelocInfo::CODE_TARGET); |
| } |
| |
| safepoint_table_builder_.DefineSafepoint(asm_, Safepoint::kSimple, 0, |
| Safepoint::kNoLazyDeopt); |
| |
| __ FinishCall(operand.sig, call_desc); |
| } |
| |
| void CallIndirect(Decoder* decoder, const Value& index, |
| const CallIndirectOperand<validate>& operand, |
| const Value args[], Value returns[]) { |
| unsupported(decoder, "call_indirect"); |
| } |
| void SimdOp(Decoder* decoder, WasmOpcode opcode, Vector<Value> args, |
| Value* result) { |
| unsupported(decoder, "simd"); |
| } |
| void SimdLaneOp(Decoder* decoder, WasmOpcode opcode, |
| const SimdLaneOperand<validate>& operand, |
| const Vector<Value> inputs, Value* result) { |
| unsupported(decoder, "simd"); |
| } |
| void SimdShiftOp(Decoder* decoder, WasmOpcode opcode, |
| const SimdShiftOperand<validate>& operand, |
| const Value& input, Value* result) { |
| unsupported(decoder, "simd"); |
| } |
| void Simd8x16ShuffleOp(Decoder* decoder, |
| const Simd8x16ShuffleOperand<validate>& operand, |
| const Value& input0, const Value& input1, |
| Value* result) { |
| unsupported(decoder, "simd"); |
| } |
| void Throw(Decoder* decoder, const ExceptionIndexOperand<validate>&, |
| Control* block, const Vector<Value>& args) { |
| unsupported(decoder, "throw"); |
| } |
| void CatchException(Decoder* decoder, |
| const ExceptionIndexOperand<validate>& operand, |
| Control* block, Vector<Value> caught_values) { |
| unsupported(decoder, "catch"); |
| } |
| void AtomicOp(Decoder* decoder, WasmOpcode opcode, Vector<Value> args, |
| const MemoryAccessOperand<validate>& operand, Value* result) { |
| unsupported(decoder, "atomicop"); |
| } |
| |
| private: |
| LiftoffAssembler* const asm_; |
| compiler::CallDescriptor* const call_desc_; |
| compiler::ModuleEnv* const env_; |
| // {min_size_} and {max_size_} are cached values computed from the ModuleEnv. |
| const uint32_t min_size_; |
| const uint32_t max_size_; |
| const compiler::RuntimeExceptionSupport runtime_exception_support_; |
| bool ok_ = true; |
| std::vector<OutOfLineCode> out_of_line_code_; |
| SourcePositionTableBuilder* const source_position_table_builder_; |
| std::vector<trap_handler::ProtectedInstructionData>* protected_instructions_; |
| // Zone used to store information during compilation. The result will be |
| // stored independently, such that this zone can die together with the |
| // LiftoffCompiler after compilation. |
| Zone* compilation_zone_; |
| // This zone is allocated when needed, held externally, and survives until |
| // code generation (in FinishCompilation). |
| std::unique_ptr<Zone>* codegen_zone_; |
| SafepointTableBuilder safepoint_table_builder_; |
| |
| void TraceCacheState(Decoder* decoder) const { |
| #ifdef DEBUG |
| if (!FLAG_trace_liftoff || !FLAG_trace_wasm_decoder) return; |
| OFStream os(stdout); |
| for (int control_depth = decoder->control_depth() - 1; control_depth >= -1; |
| --control_depth) { |
| LiftoffAssembler::CacheState* cache_state = |
| control_depth == -1 |
| ? asm_->cache_state() |
| : &decoder->control_at(control_depth)->label_state; |
| bool first = true; |
| for (LiftoffAssembler::VarState& slot : cache_state->stack_state) { |
| os << (first ? "" : "-") << slot; |
| first = false; |
| } |
| if (control_depth != -1) PrintF("; "); |
| } |
| os << "\n"; |
| #endif |
| } |
| }; |
| |
| } // namespace |
| } // namespace wasm |
| |
| bool compiler::WasmCompilationUnit::ExecuteLiftoffCompilation() { |
| base::ElapsedTimer compile_timer; |
| if (FLAG_trace_wasm_decode_time) { |
| compile_timer.Start(); |
| } |
| |
| Zone zone(isolate_->allocator(), "LiftoffCompilationZone"); |
| const wasm::WasmModule* module = env_ ? env_->module : nullptr; |
| auto* call_desc = compiler::GetWasmCallDescriptor(&zone, func_body_.sig); |
| base::Optional<TimedHistogramScope> liftoff_compile_time_scope( |
| base::in_place, counters()->liftoff_compile_time()); |
| wasm::WasmFullDecoder<wasm::Decoder::kValidate, wasm::LiftoffCompiler> |
| decoder(&zone, module, func_body_, &liftoff_.asm_, call_desc, env_, |
| runtime_exception_support_, |
| &liftoff_.source_position_table_builder_, |
| protected_instructions_.get(), &zone, &liftoff_.codegen_zone_); |
| decoder.Decode(); |
| liftoff_compile_time_scope.reset(); |
| if (!decoder.interface().ok()) { |
| // Liftoff compilation failed. |
| isolate_->counters()->liftoff_unsupported_functions()->Increment(); |
| return false; |
| } |
| if (decoder.failed()) return false; // Validation error |
| |
| if (FLAG_trace_wasm_decode_time) { |
| double compile_ms = compile_timer.Elapsed().InMillisecondsF(); |
| PrintF( |
| "wasm-compilation liftoff phase 1 ok: %u bytes, %0.3f ms decode and " |
| "compile\n", |
| static_cast<unsigned>(func_body_.end - func_body_.start), compile_ms); |
| } |
| |
| // Record the memory cost this unit places on the system until |
| // it is finalized. |
| memory_cost_ = liftoff_.asm_.pc_offset(); |
| liftoff_.safepoint_table_offset_ = |
| decoder.interface().GetSafepointTableOffset(); |
| isolate_->counters()->liftoff_compiled_functions()->Increment(); |
| return true; |
| } |
| |
| #undef __ |
| #undef TRACE |
| |
| } // namespace internal |
| } // namespace v8 |
