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chromium / v8 / v8 / 014d9e4f327cb71dc6d0e6e2f2d8f7cf9cfc0e2f / . / src / wasm / baseline / liftoff-compiler.cc
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// 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-compiler.h"
#include "src/assembler-inl.h"
#include "src/base/optional.h"
// TODO(clemensh): Remove dependences on compiler stuff.
#include "src/compiler/linkage.h"
#include "src/compiler/wasm-compiler.h"
#include "src/counters.h"
#include "src/macro-assembler-inl.h"
#include "src/objects/smi.h"
#include "src/tracing/trace-event.h"
#include "src/wasm/baseline/liftoff-assembler.h"
#include "src/wasm/function-body-decoder-impl.h"
#include "src/wasm/function-compiler.h"
#include "src/wasm/memory-tracing.h"
#include "src/wasm/object-access.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-linkage.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 KIntConst = LiftoffAssembler::VarState::KIntConst;
constexpr auto kStack = LiftoffAssembler::VarState::kStack;
namespace {
#define __ asm_.
#define TRACE(...) \
do { \
if (FLAG_trace_liftoff) PrintF("[liftoff] " __VA_ARGS__); \
} while (false)
#define WASM_INSTANCE_OBJECT_OFFSET(name) \
ObjectAccess::ToTagged(WasmInstanceObject::k##name##Offset)
template <int expected_size, int actual_size>
struct assert_field_size {
static_assert(expected_size == actual_size,
"field in WasmInstance does not have the expected size");
static constexpr int size = actual_size;
};
#define WASM_INSTANCE_OBJECT_SIZE(name) \
(WasmInstanceObject::k##name##OffsetEnd - \
WasmInstanceObject::k##name##Offset + 1) // NOLINT(whitespace/indent)
#define LOAD_INSTANCE_FIELD(dst, name, load_size) \
__ LoadFromInstance( \
dst, WASM_INSTANCE_OBJECT_OFFSET(name), \
assert_field_size<WASM_INSTANCE_OBJECT_SIZE(name), load_size>::size);
#ifdef DEBUG
#define DEBUG_CODE_COMMENT(str) \
do { \
__ RecordComment(str); \
} while (false)
#else
#define DEBUG_CODE_COMMENT(str) ((void)0)
#endif
constexpr LoadType::LoadTypeValue kPointerLoadType =
kPointerSize == 8 ? LoadType::kI64Load : LoadType::kI32Load;
#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:
MOVE_ONLY_NO_DEFAULT_CONSTRUCTOR(MovableLabel);
MovableLabel() : label_(new Label()) {}
Label* get() { return label_.get(); }
private:
std::unique_ptr<Label> label_;
};
#else
// On all other platforms, just store the Label directly.
class MovableLabel {
public:
MOVE_ONLY_WITH_DEFAULT_CONSTRUCTORS(MovableLabel);
Label* get() { return &label_; }
private:
Label label_;
};
#endif
compiler::CallDescriptor* GetLoweredCallDescriptor(
Zone* zone, compiler::CallDescriptor* call_desc) {
return kPointerSize == 4 ? compiler::GetI32WasmCallDescriptor(zone, call_desc)
: call_desc;
}
constexpr ValueType kTypesArr_ilfd[] = {kWasmI32, kWasmI64, kWasmF32, kWasmF64};
constexpr Vector<const ValueType> kTypes_ilfd = ArrayVector(kTypesArr_ilfd);
class LiftoffCompiler {
public:
// TODO(clemensh): Make this a template parameter.
static constexpr Decoder::ValidateFlag validate = 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 FullDecoder = WasmFullDecoder<validate, LiftoffCompiler>;
struct OutOfLineCode {
MovableLabel label;
MovableLabel continuation;
WasmCode::RuntimeStubId stub;
WasmCodePosition position;
LiftoffRegList regs_to_save;
uint32_t pc; // for trap handler.
// Named constructors:
static OutOfLineCode Trap(WasmCode::RuntimeStubId s, WasmCodePosition pos,
uint32_t pc) {
DCHECK_LT(0, pos);
return {{}, {}, s, pos, {}, pc};
}
static OutOfLineCode StackCheck(WasmCodePosition pos, LiftoffRegList regs) {
return {{}, {}, WasmCode::kWasmStackGuard, pos, regs, 0};
}
};
LiftoffCompiler(compiler::CallDescriptor* call_descriptor,
CompilationEnv* env, Zone* compilation_zone)
: descriptor_(
GetLoweredCallDescriptor(compilation_zone, call_descriptor)),
env_(env),
compilation_zone_(compilation_zone),
safepoint_table_builder_(compilation_zone_) {}
~LiftoffCompiler() { BindUnboundLabels(nullptr); }
bool ok() const { return ok_; }
void GetCode(CodeDesc* desc) { asm_.GetCode(nullptr, desc); }
OwnedVector<uint8_t> GetSourcePositionTable() {
return source_position_table_builder_.ToSourcePositionTableVector();
}
OwnedVector<trap_handler::ProtectedInstructionData> GetProtectedInstructions()
const {
return OwnedVector<trap_handler::ProtectedInstructionData>::Of(
protected_instructions_);
}
uint32_t GetTotalFrameSlotCount() const {
return __ GetTotalFrameSlotCount();
}
void unsupported(FullDecoder* decoder, const char* reason) {
ok_ = false;
TRACE("unsupported: %s\n", reason);
decoder->errorf(decoder->pc(), "unsupported liftoff operation: %s", reason);
BindUnboundLabels(decoder);
}
bool DidAssemblerBailout(FullDecoder* decoder) {
if (decoder->failed() || !__ did_bailout()) return false;
unsupported(decoder, __ bailout_reason());
return true;
}
bool CheckSupportedType(FullDecoder* decoder,
Vector<const ValueType> supported_types,
ValueType type, const char* context) {
char buffer[128];
// Check supported types.
for (ValueType supported : supported_types) {
if (type == supported) return true;
}
SNPrintF(ArrayVector(buffer), "%s %s", ValueTypes::TypeName(type), context);
unsupported(decoder, buffer);
return false;
}
int GetSafepointTableOffset() const {
return safepoint_table_builder_.GetCodeOffset();
}
void BindUnboundLabels(FullDecoder* decoder) {
#ifdef DEBUG
// Bind all labels now, otherwise their destructor will fire a DCHECK error
// if they where referenced before.
uint32_t control_depth = decoder ? decoder->control_depth() : 0;
for (uint32_t i = 0; i < control_depth; ++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 StartFunction(FullDecoder* 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 CollectReservedRegsForParameters(uint32_t input_idx_start,
uint32_t num_params,
LiftoffRegList& param_regs) {
uint32_t input_idx = input_idx_start;
for (uint32_t param_idx = 0; param_idx < num_params; ++param_idx) {
ValueType type = __ local_type(param_idx);
const int num_lowered_params = 1 + needs_reg_pair(type);
RegClass rc = num_lowered_params == 1 ? reg_class_for(type) : kGpReg;
for (int pair_idx = 0; pair_idx < num_lowered_params; ++pair_idx) {
compiler::LinkageLocation param_loc =
descriptor_->GetInputLocation(input_idx + pair_idx);
if (param_loc.IsRegister()) {
DCHECK(!param_loc.IsAnyRegister());
int reg_code = param_loc.AsRegister();
RegList cache_regs = rc == kGpReg ? kLiftoffAssemblerGpCacheRegs
: kLiftoffAssemblerFpCacheRegs;
if (cache_regs & (1ULL << reg_code)) {
LiftoffRegister in_reg = LiftoffRegister::from_code(rc, reg_code);
param_regs.set(in_reg);
}
}
}
input_idx += num_lowered_params;
}
}
// Returns the number of inputs processed (1 or 2).
uint32_t ProcessParameter(ValueType type, uint32_t input_idx) {
const int num_lowered_params = 1 + needs_reg_pair(type);
ValueType lowered_type = needs_reg_pair(type) ? kWasmI32 : type;
RegClass rc = reg_class_for(lowered_type);
// Initialize to anything, will be set in the loop and used afterwards.
LiftoffRegister reg = kGpCacheRegList.GetFirstRegSet();
LiftoffRegList pinned;
for (int pair_idx = 0; pair_idx < num_lowered_params; ++pair_idx) {
compiler::LinkageLocation param_loc =
descriptor_->GetInputLocation(input_idx + pair_idx);
// Initialize to anything, will be set in both arms of the if.
LiftoffRegister in_reg = kGpCacheRegList.GetFirstRegSet();
if (param_loc.IsRegister()) {
DCHECK(!param_loc.IsAnyRegister());
int reg_code = param_loc.AsRegister();
RegList cache_regs = rc == kGpReg ? kLiftoffAssemblerGpCacheRegs
: kLiftoffAssemblerFpCacheRegs;
if (cache_regs & (1ULL << reg_code)) {
// This is a cache register, just use it.
in_reg = LiftoffRegister::from_code(rc, reg_code);
} else {
// Move to a cache register (spill one if necessary).
// Note that we cannot create a {LiftoffRegister} for reg_code, since
// {LiftoffRegister} can only store cache regs.
in_reg = __ GetUnusedRegister(rc, pinned);
if (rc == kGpReg) {
__ Move(in_reg.gp(), Register::from_code(reg_code), lowered_type);
} else {
__ Move(in_reg.fp(), DoubleRegister::from_code(reg_code),
lowered_type);
}
}
} else if (param_loc.IsCallerFrameSlot()) {
in_reg = __ GetUnusedRegister(rc, pinned);
__ LoadCallerFrameSlot(in_reg, -param_loc.AsCallerFrameSlot(),
lowered_type);
}
reg = pair_idx == 0 ? in_reg
: LiftoffRegister::ForPair(reg.gp(), in_reg.gp());
pinned.set(reg);
}
__ PushRegister(type, reg);
return num_lowered_params;
}
void StackCheck(WasmCodePosition position) {
if (FLAG_wasm_no_stack_checks || !env_->runtime_exception_support) return;
out_of_line_code_.push_back(
OutOfLineCode::StackCheck(position, __ cache_state()->used_registers));
OutOfLineCode& ool = out_of_line_code_.back();
Register limit_address = __ GetUnusedRegister(kGpReg).gp();
LOAD_INSTANCE_FIELD(limit_address, StackLimitAddress, kPointerSize);
__ StackCheck(ool.label.get(), limit_address);
__ bind(ool.continuation.get());
}
void StartFunctionBody(FullDecoder* decoder, Control* block) {
for (uint32_t i = 0; i < __ num_locals(); ++i) {
if (!CheckSupportedType(decoder, kTypes_ilfd, __ local_type(i), "param"))
return;
}
// Input 0 is the call target, the instance is at 1.
constexpr int kInstanceParameterIndex = 1;
// Store the instance parameter to a special stack slot.
compiler::LinkageLocation instance_loc =
descriptor_->GetInputLocation(kInstanceParameterIndex);
DCHECK(instance_loc.IsRegister());
DCHECK(!instance_loc.IsAnyRegister());
Register instance_reg = Register::from_code(instance_loc.AsRegister());
DCHECK_EQ(kWasmInstanceRegister, instance_reg);
// Parameter 0 is the instance parameter.
uint32_t num_params =
static_cast<uint32_t>(decoder->sig_->parameter_count());
__ EnterFrame(StackFrame::WASM_COMPILED);
__ set_has_frame(true);
pc_offset_stack_frame_construction_ = __ PrepareStackFrame();
// {PrepareStackFrame} is the first platform-specific assembler method.
// If this failed, we can bail out immediately, avoiding runtime overhead
// and potential failures because of other unimplemented methods.
// A platform implementing {PrepareStackFrame} must ensure that we can
// finish compilation without errors even if we hit unimplemented
// LiftoffAssembler methods.
if (DidAssemblerBailout(decoder)) return;
__ SpillInstance(instance_reg);
// Input 0 is the code target, 1 is the instance. First parameter at 2.
uint32_t input_idx = kInstanceParameterIndex + 1;
for (uint32_t param_idx = 0; param_idx < num_params; ++param_idx) {
input_idx += ProcessParameter(__ local_type(param_idx), input_idx);
}
DCHECK_EQ(input_idx, descriptor_->InputCount());
// Set to a gp register, to mark this uninitialized.
LiftoffRegister zero_double_reg = kGpCacheRegList.GetFirstRegSet();
DCHECK(zero_double_reg.is_gp());
for (uint32_t param_idx = num_params; 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 kWasmI64:
__ cache_state()->stack_state.emplace_back(kWasmI64, uint32_t{0});
break;
case kWasmF32:
case kWasmF64:
if (zero_double_reg.is_gp()) {
// Note: This might spill one of the registers used to hold
// parameters.
zero_double_reg = __ GetUnusedRegister(kFpReg);
// Zero is represented by the bit pattern 0 for both f32 and f64.
__ LoadConstant(zero_double_reg, WasmValue(0.));
}
__ PushRegister(type, 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(), __ cache_state()->stack_height());
}
void GenerateOutOfLineCode(OutOfLineCode& ool) {
__ bind(ool.label.get());
const bool is_stack_check = ool.stub == WasmCode::kWasmStackGuard;
const bool is_mem_out_of_bounds =
ool.stub == WasmCode::kThrowWasmTrapMemOutOfBounds;
if (is_mem_out_of_bounds && 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 (!env_->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);
__ DropStackSlotsAndRet(
static_cast<uint32_t>(descriptor_->StackParameterCount()));
return;
}
if (!ool.regs_to_save.is_empty()) __ PushRegisters(ool.regs_to_save);
source_position_table_builder_.AddPosition(
__ pc_offset(), SourcePosition(ool.position), false);
__ CallRuntimeStub(ool.stub);
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(FullDecoder* decoder) {
if (DidAssemblerBailout(decoder)) return;
for (OutOfLineCode& ool : out_of_line_code_) {
GenerateOutOfLineCode(ool);
}
__ PatchPrepareStackFrame(pc_offset_stack_frame_construction_,
__ GetTotalFrameSlotCount());
__ FinishCode();
safepoint_table_builder_.Emit(&asm_, __ GetTotalFrameSlotCount());
// The previous calls may have also generated a bailout.
DidAssemblerBailout(decoder);
}
void OnFirstError(FullDecoder* decoder) {
ok_ = false;
BindUnboundLabels(decoder);
asm_.AbortCompilation();
}
void NextInstruction(FullDecoder* decoder, WasmOpcode opcode) {
TraceCacheState(decoder);
SLOW_DCHECK(__ ValidateCacheState());
DEBUG_CODE_COMMENT(WasmOpcodes::OpcodeName(opcode));
}
void Block(FullDecoder* decoder, Control* block) {
block->label_state.stack_base = __ cache_state()->stack_height();
}
void Loop(FullDecoder* 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(FullDecoder* decoder, Control* block) {
unsupported(decoder, "try");
}
void If(FullDecoder* 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().gp();
__ emit_cond_jump(kEqual, if_block->else_state->label.get(), kWasmI32,
value);
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(FullDecoder* 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(FullDecoder* 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(FullDecoder* decoder, Control* c) {}
enum CCallReturn : bool { kHasReturn = true, kNoReturn = false };
void GenerateCCall(const LiftoffRegister* result_regs, FunctionSig* sig,
ValueType out_argument_type,
const LiftoffRegister* arg_regs,
ExternalReference ext_ref) {
// Before making a call, spill all cache registers.
__ SpillAllRegisters();
// Store arguments on our stack, then align the stack for calling to C.
int param_bytes = 0;
for (ValueType param_type : sig->parameters()) {
param_bytes += ValueTypes::MemSize(param_type);
}
int out_arg_bytes = out_argument_type == kWasmStmt
? 0
: ValueTypes::MemSize(out_argument_type);
int stack_bytes = std::max(param_bytes, out_arg_bytes);
__ CallC(sig, arg_regs, result_regs, out_argument_type, stack_bytes,
ext_ref);
}
template <ValueType src_type, ValueType result_type, class EmitFn>
void EmitUnOp(EmitFn fn) {
static RegClass src_rc = reg_class_for(src_type);
static RegClass result_rc = reg_class_for(result_type);
LiftoffRegister src = __ PopToRegister();
LiftoffRegister dst = src_rc == result_rc
? __ GetUnusedRegister(result_rc, {src})
: __ GetUnusedRegister(result_rc);
fn(dst, src);
__ PushRegister(result_type, dst);
}
void EmitI32UnOpWithCFallback(bool (LiftoffAssembler::*emit_fn)(Register,
Register),
ExternalReference (*fallback_fn)()) {
auto emit_with_c_fallback = [=](LiftoffRegister dst, LiftoffRegister src) {
if (emit_fn && (asm_.*emit_fn)(dst.gp(), src.gp())) return;
ExternalReference ext_ref = fallback_fn();
ValueType sig_i_i_reps[] = {kWasmI32, kWasmI32};
FunctionSig sig_i_i(1, 1, sig_i_i_reps);
GenerateCCall(&dst, &sig_i_i, kWasmStmt, &src, ext_ref);
};
EmitUnOp<kWasmI32, kWasmI32>(emit_with_c_fallback);
}
template <ValueType type>
void EmitFloatUnOpWithCFallback(
bool (LiftoffAssembler::*emit_fn)(DoubleRegister, DoubleRegister),
ExternalReference (*fallback_fn)()) {
auto emit_with_c_fallback = [=](LiftoffRegister dst, LiftoffRegister src) {
if ((asm_.*emit_fn)(dst.fp(), src.fp())) return;
ExternalReference ext_ref = fallback_fn();
ValueType sig_reps[] = {type};
FunctionSig sig(0, 1, sig_reps);
GenerateCCall(&dst, &sig, type, &src, ext_ref);
};
EmitUnOp<type, type>(emit_with_c_fallback);
}
enum TypeConversionTrapping : bool { kCanTrap = true, kNoTrap = false };
template <ValueType dst_type, ValueType src_type,
TypeConversionTrapping can_trap>
void EmitTypeConversion(WasmOpcode opcode, ExternalReference (*fallback_fn)(),
WasmCodePosition trap_position) {
static constexpr RegClass src_rc = reg_class_for(src_type);
static constexpr RegClass dst_rc = reg_class_for(dst_type);
LiftoffRegister src = __ PopToRegister();
LiftoffRegister dst = src_rc == dst_rc ? __ GetUnusedRegister(dst_rc, {src})
: __ GetUnusedRegister(dst_rc);
DCHECK_EQ(!!can_trap, trap_position > 0);
Label* trap = can_trap ? AddOutOfLineTrap(
trap_position,
WasmCode::kThrowWasmTrapFloatUnrepresentable)
: nullptr;
if (!__ emit_type_conversion(opcode, dst, src, trap)) {
DCHECK_NOT_NULL(fallback_fn);
ExternalReference ext_ref = fallback_fn();
if (can_trap) {
// External references for potentially trapping conversions return int.
ValueType sig_reps[] = {kWasmI32, src_type};
FunctionSig sig(1, 1, sig_reps);
LiftoffRegister ret_reg =
__ GetUnusedRegister(kGpReg, LiftoffRegList::ForRegs(dst));
LiftoffRegister dst_regs[] = {ret_reg, dst};
GenerateCCall(dst_regs, &sig, dst_type, &src, ext_ref);
__ emit_cond_jump(kEqual, trap, kWasmI32, ret_reg.gp());
} else {
ValueType sig_reps[] = {src_type};
FunctionSig sig(0, 1, sig_reps);
GenerateCCall(&dst, &sig, dst_type, &src, ext_ref);
}
}
__ PushRegister(dst_type, dst);
}
void UnOp(FullDecoder* decoder, WasmOpcode opcode, FunctionSig*,
const Value& value, Value* result) {
#define CASE_I32_UNOP(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
EmitUnOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister src) { \
__ emit_##fn(dst.gp(), src.gp()); \
}); \
break;
#define CASE_I32_SIGN_EXTENSION(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
EmitUnOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister src) { \
__ emit_##fn(dst.gp(), src.gp()); \
}); \
break;
#define CASE_I64_SIGN_EXTENSION(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
EmitUnOp<kWasmI64, kWasmI64>( \
[=](LiftoffRegister dst, LiftoffRegister src) { \
__ emit_##fn(dst, src); \
}); \
break;
#define CASE_FLOAT_UNOP(opcode, type, fn) \
case WasmOpcode::kExpr##opcode: \
EmitUnOp<kWasm##type, kWasm##type>( \
[=](LiftoffRegister dst, LiftoffRegister src) { \
__ emit_##fn(dst.fp(), src.fp()); \
}); \
break;
#define CASE_FLOAT_UNOP_WITH_CFALLBACK(opcode, type, fn) \
case WasmOpcode::kExpr##opcode: \
EmitFloatUnOpWithCFallback<kWasm##type>(&LiftoffAssembler::emit_##fn, \
&ExternalReference::wasm_##fn); \
break;
#define CASE_TYPE_CONVERSION(opcode, dst_type, src_type, ext_ref, can_trap) \
case WasmOpcode::kExpr##opcode: \
EmitTypeConversion<kWasm##dst_type, kWasm##src_type, can_trap>( \
kExpr##opcode, ext_ref, can_trap ? decoder->position() : 0); \
break;
switch (opcode) {
CASE_I32_UNOP(I32Eqz, i32_eqz)
CASE_I32_UNOP(I32Clz, i32_clz)
CASE_I32_UNOP(I32Ctz, i32_ctz)
CASE_FLOAT_UNOP(F32Abs, F32, f32_abs)
CASE_FLOAT_UNOP(F32Neg, F32, f32_neg)
CASE_FLOAT_UNOP(F32Ceil, F32, f32_ceil)
CASE_FLOAT_UNOP(F32Floor, F32, f32_floor)
CASE_FLOAT_UNOP(F32Trunc, F32, f32_trunc)
CASE_FLOAT_UNOP(F32NearestInt, F32, f32_nearest_int)
CASE_FLOAT_UNOP(F32Sqrt, F32, f32_sqrt)
CASE_FLOAT_UNOP(F64Abs, F64, f64_abs)
CASE_FLOAT_UNOP(F64Neg, F64, f64_neg)
CASE_FLOAT_UNOP_WITH_CFALLBACK(F64Ceil, F64, f64_ceil)
CASE_FLOAT_UNOP_WITH_CFALLBACK(F64Floor, F64, f64_floor)
CASE_FLOAT_UNOP_WITH_CFALLBACK(F64Trunc, F64, f64_trunc)
CASE_FLOAT_UNOP_WITH_CFALLBACK(F64NearestInt, F64, f64_nearest_int)
CASE_FLOAT_UNOP(F64Sqrt, F64, f64_sqrt)
CASE_TYPE_CONVERSION(I32ConvertI64, I32, I64, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(I32SConvertF32, I32, F32, nullptr, kCanTrap)
CASE_TYPE_CONVERSION(I32UConvertF32, I32, F32, nullptr, kCanTrap)
CASE_TYPE_CONVERSION(I32SConvertF64, I32, F64, nullptr, kCanTrap)
CASE_TYPE_CONVERSION(I32UConvertF64, I32, F64, nullptr, kCanTrap)
CASE_TYPE_CONVERSION(I32ReinterpretF32, I32, F32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(I64SConvertI32, I64, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(I64UConvertI32, I64, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(I64SConvertF32, I64, F32,
&ExternalReference::wasm_float32_to_int64, kCanTrap)
CASE_TYPE_CONVERSION(I64UConvertF32, I64, F32,
&ExternalReference::wasm_float32_to_uint64, kCanTrap)
CASE_TYPE_CONVERSION(I64SConvertF64, I64, F64,
&ExternalReference::wasm_float64_to_int64, kCanTrap)
CASE_TYPE_CONVERSION(I64UConvertF64, I64, F64,
&ExternalReference::wasm_float64_to_uint64, kCanTrap)
CASE_TYPE_CONVERSION(I64ReinterpretF64, I64, F64, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F32SConvertI32, F32, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F32UConvertI32, F32, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F32SConvertI64, F32, I64,
&ExternalReference::wasm_int64_to_float32, kNoTrap)
CASE_TYPE_CONVERSION(F32UConvertI64, F32, I64,
&ExternalReference::wasm_uint64_to_float32, kNoTrap)
CASE_TYPE_CONVERSION(F32ConvertF64, F32, F64, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F32ReinterpretI32, F32, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F64SConvertI32, F64, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F64UConvertI32, F64, I32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F64SConvertI64, F64, I64,
&ExternalReference::wasm_int64_to_float64, kNoTrap)
CASE_TYPE_CONVERSION(F64UConvertI64, F64, I64,
&ExternalReference::wasm_uint64_to_float64, kNoTrap)
CASE_TYPE_CONVERSION(F64ConvertF32, F64, F32, nullptr, kNoTrap)
CASE_TYPE_CONVERSION(F64ReinterpretI64, F64, I64, nullptr, kNoTrap)
CASE_I32_SIGN_EXTENSION(I32SExtendI8, i32_signextend_i8)
CASE_I32_SIGN_EXTENSION(I32SExtendI16, i32_signextend_i16)
CASE_I64_SIGN_EXTENSION(I64SExtendI8, i64_signextend_i8)
CASE_I64_SIGN_EXTENSION(I64SExtendI16, i64_signextend_i16)
CASE_I64_SIGN_EXTENSION(I64SExtendI32, i64_signextend_i32)
case kExprI32Popcnt:
EmitI32UnOpWithCFallback(&LiftoffAssembler::emit_i32_popcnt,
&ExternalReference::wasm_word32_popcnt);
break;
case WasmOpcode::kExprI64Eqz:
EmitUnOp<kWasmI64, kWasmI32>(
[=](LiftoffRegister dst, LiftoffRegister src) {
__ emit_i64_eqz(dst.gp(), src);
});
break;
default:
return unsupported(decoder, WasmOpcodes::OpcodeName(opcode));
}
#undef CASE_I32_UNOP
#undef CASE_I32_SIGN_EXTENSION
#undef CASE_I64_SIGN_EXTENSION
#undef CASE_FLOAT_UNOP
#undef CASE_FLOAT_UNOP_WITH_CFALLBACK
#undef CASE_TYPE_CONVERSION
}
template <ValueType src_type, ValueType result_type, typename EmitFn>
void EmitBinOp(EmitFn fn) {
static constexpr RegClass src_rc = reg_class_for(src_type);
static constexpr RegClass result_rc = reg_class_for(result_type);
LiftoffRegister rhs = __ PopToRegister();
LiftoffRegister lhs = __ PopToRegister(LiftoffRegList::ForRegs(rhs));
LiftoffRegister dst = src_rc == result_rc
? __ GetUnusedRegister(result_rc, {lhs, rhs})
: __ GetUnusedRegister(result_rc);
fn(dst, lhs, rhs);
__ PushRegister(result_type, dst);
}
void EmitDivOrRem64CCall(LiftoffRegister dst, LiftoffRegister lhs,
LiftoffRegister rhs, ExternalReference ext_ref,
Label* trap_by_zero,
Label* trap_unrepresentable = nullptr) {
// Cannot emit native instructions, build C call.
LiftoffRegister ret =
__ GetUnusedRegister(kGpReg, LiftoffRegList::ForRegs(dst));
LiftoffRegister tmp =
__ GetUnusedRegister(kGpReg, LiftoffRegList::ForRegs(dst, ret));
LiftoffRegister arg_regs[] = {lhs, rhs};
LiftoffRegister result_regs[] = {ret, dst};
ValueType sig_types[] = {kWasmI32, kWasmI64, kWasmI64};
// <i64, i64> -> i32 (with i64 output argument)
FunctionSig sig(1, 2, sig_types);
GenerateCCall(result_regs, &sig, kWasmI64, arg_regs, ext_ref);
__ LoadConstant(tmp, WasmValue(int32_t{0}));
__ emit_cond_jump(kEqual, trap_by_zero, kWasmI32, ret.gp(), tmp.gp());
if (trap_unrepresentable) {
__ LoadConstant(tmp, WasmValue(int32_t{-1}));
__ emit_cond_jump(kEqual, trap_unrepresentable, kWasmI32, ret.gp(),
tmp.gp());
}
}
void BinOp(FullDecoder* decoder, WasmOpcode opcode, FunctionSig*,
const Value& lhs, const Value& rhs, Value* result) {
#define CASE_I32_BINOP(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_##fn(dst.gp(), lhs.gp(), rhs.gp()); \
});
#define CASE_I64_BINOP(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI64, kWasmI64>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_##fn(dst, lhs, rhs); \
});
#define CASE_FLOAT_BINOP(opcode, type, fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasm##type, kWasm##type>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_##fn(dst.fp(), lhs.fp(), rhs.fp()); \
});
#define CASE_I32_CMPOP(opcode, cond) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_i32_set_cond(cond, dst.gp(), lhs.gp(), rhs.gp()); \
});
#define CASE_I64_CMPOP(opcode, cond) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI64, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_i64_set_cond(cond, dst.gp(), lhs, rhs); \
});
#define CASE_F32_CMPOP(opcode, cond) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmF32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_f32_set_cond(cond, dst.gp(), lhs.fp(), rhs.fp()); \
});
#define CASE_F64_CMPOP(opcode, cond) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmF64, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_f64_set_cond(cond, dst.gp(), lhs.fp(), rhs.fp()); \
});
#define CASE_I32_SHIFTOP(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
__ emit_##fn(dst.gp(), lhs.gp(), rhs.gp(), {}); \
});
#define CASE_I64_SHIFTOP(opcode, fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI64, kWasmI64>([=](LiftoffRegister dst, \
LiftoffRegister src, \
LiftoffRegister amount) { \
__ emit_##fn(dst, src, amount.is_pair() ? amount.low_gp() : amount.gp(), \
{}); \
});
#define CASE_CCALL_BINOP(opcode, type, ext_ref_fn) \
case WasmOpcode::kExpr##opcode: \
return EmitBinOp<kWasmI32, kWasmI32>( \
[=](LiftoffRegister dst, LiftoffRegister lhs, LiftoffRegister rhs) { \
LiftoffRegister args[] = {lhs, rhs}; \
auto ext_ref = ExternalReference::ext_ref_fn(); \
ValueType sig_i_ii_reps[] = {kWasmI32, kWasmI32, kWasmI32}; \
FunctionSig sig_i_ii(1, 2, sig_i_ii_reps); \
GenerateCCall(&dst, &sig_i_ii, kWasmStmt, args, ext_ref); \
});
switch (opcode) {
CASE_I32_BINOP(I32Add, i32_add)
CASE_I32_BINOP(I32Sub, i32_sub)
CASE_I32_BINOP(I32Mul, i32_mul)
CASE_I32_BINOP(I32And, i32_and)
CASE_I32_BINOP(I32Ior, i32_or)
CASE_I32_BINOP(I32Xor, i32_xor)
CASE_I64_BINOP(I64And, i64_and)
CASE_I64_BINOP(I64Ior, i64_or)
CASE_I64_BINOP(I64Xor, i64_xor)
CASE_I32_CMPOP(I32Eq, kEqual)
CASE_I32_CMPOP(I32Ne, kUnequal)
CASE_I32_CMPOP(I32LtS, kSignedLessThan)
CASE_I32_CMPOP(I32LtU, kUnsignedLessThan)
CASE_I32_CMPOP(I32GtS, kSignedGreaterThan)
CASE_I32_CMPOP(I32GtU, kUnsignedGreaterThan)
CASE_I32_CMPOP(I32LeS, kSignedLessEqual)
CASE_I32_CMPOP(I32LeU, kUnsignedLessEqual)
CASE_I32_CMPOP(I32GeS, kSignedGreaterEqual)
CASE_I32_CMPOP(I32GeU, kUnsignedGreaterEqual)
CASE_I64_BINOP(I64Add, i64_add)
CASE_I64_BINOP(I64Sub, i64_sub)
CASE_I64_BINOP(I64Mul, i64_mul)
CASE_I64_CMPOP(I64Eq, kEqual)
CASE_I64_CMPOP(I64Ne, kUnequal)
CASE_I64_CMPOP(I64LtS, kSignedLessThan)
CASE_I64_CMPOP(I64LtU, kUnsignedLessThan)
CASE_I64_CMPOP(I64GtS, kSignedGreaterThan)
CASE_I64_CMPOP(I64GtU, kUnsignedGreaterThan)
CASE_I64_CMPOP(I64LeS, kSignedLessEqual)
CASE_I64_CMPOP(I64LeU, kUnsignedLessEqual)
CASE_I64_CMPOP(I64GeS, kSignedGreaterEqual)
CASE_I64_CMPOP(I64GeU, kUnsignedGreaterEqual)
CASE_F32_CMPOP(F32Eq, kEqual)
CASE_F32_CMPOP(F32Ne, kUnequal)
CASE_F32_CMPOP(F32Lt, kUnsignedLessThan)
CASE_F32_CMPOP(F32Gt, kUnsignedGreaterThan)
CASE_F32_CMPOP(F32Le, kUnsignedLessEqual)
CASE_F32_CMPOP(F32Ge, kUnsignedGreaterEqual)
CASE_F64_CMPOP(F64Eq, kEqual)
CASE_F64_CMPOP(F64Ne, kUnequal)
CASE_F64_CMPOP(F64Lt, kUnsignedLessThan)
CASE_F64_CMPOP(F64Gt, kUnsignedGreaterThan)
CASE_F64_CMPOP(F64Le, kUnsignedLessEqual)
CASE_F64_CMPOP(F64Ge, kUnsignedGreaterEqual)
CASE_I32_SHIFTOP(I32Shl, i32_shl)
CASE_I32_SHIFTOP(I32ShrS, i32_sar)
CASE_I32_SHIFTOP(I32ShrU, i32_shr)
CASE_I64_SHIFTOP(I64Shl, i64_shl)
CASE_I64_SHIFTOP(I64ShrS, i64_sar)
CASE_I64_SHIFTOP(I64ShrU, i64_shr)
CASE_CCALL_BINOP(I32Rol, I32, wasm_word32_rol)
CASE_CCALL_BINOP(I32Ror, I32, wasm_word32_ror)
CASE_FLOAT_BINOP(F32Add, F32, f32_add)
CASE_FLOAT_BINOP(F32Sub, F32, f32_sub)
CASE_FLOAT_BINOP(F32Mul, F32, f32_mul)
CASE_FLOAT_BINOP(F32Div, F32, f32_div)
CASE_FLOAT_BINOP(F32Min, F32, f32_min)
CASE_FLOAT_BINOP(F32Max, F32, f32_max)
CASE_FLOAT_BINOP(F32CopySign, F32, f32_copysign)
CASE_FLOAT_BINOP(F64Add, F64, f64_add)
CASE_FLOAT_BINOP(F64Sub, F64, f64_sub)
CASE_FLOAT_BINOP(F64Mul, F64, f64_mul)
CASE_FLOAT_BINOP(F64Div, F64, f64_div)
CASE_FLOAT_BINOP(F64Min, F64, f64_min)
CASE_FLOAT_BINOP(F64Max, F64, f64_max)
CASE_FLOAT_BINOP(F64CopySign, F64, f64_copysign)
case WasmOpcode::kExprI32DivS:
EmitBinOp<kWasmI32, kWasmI32>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
WasmCodePosition position = decoder->position();
AddOutOfLineTrap(position, WasmCode::kThrowWasmTrapDivByZero);
// Adding the second trap might invalidate the pointer returned for
// the first one, thus get both pointers afterwards.
AddOutOfLineTrap(position,
WasmCode::kThrowWasmTrapDivUnrepresentable);
Label* div_by_zero = out_of_line_code_.end()[-2].label.get();
Label* div_unrepresentable = out_of_line_code_.end()[-1].label.get();
__ emit_i32_divs(dst.gp(), lhs.gp(), rhs.gp(), div_by_zero,
div_unrepresentable);
});
break;
case WasmOpcode::kExprI32DivU:
EmitBinOp<kWasmI32, kWasmI32>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* div_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapDivByZero);
__ emit_i32_divu(dst.gp(), lhs.gp(), rhs.gp(), div_by_zero);
});
break;
case WasmOpcode::kExprI32RemS:
EmitBinOp<kWasmI32, kWasmI32>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* rem_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapRemByZero);
__ emit_i32_rems(dst.gp(), lhs.gp(), rhs.gp(), rem_by_zero);
});
break;
case WasmOpcode::kExprI32RemU:
EmitBinOp<kWasmI32, kWasmI32>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* rem_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapRemByZero);
__ emit_i32_remu(dst.gp(), lhs.gp(), rhs.gp(), rem_by_zero);
});
break;
case WasmOpcode::kExprI64DivS:
EmitBinOp<kWasmI64, kWasmI64>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
WasmCodePosition position = decoder->position();
AddOutOfLineTrap(position, WasmCode::kThrowWasmTrapDivByZero);
// Adding the second trap might invalidate the pointer returned for
// the first one, thus get both pointers afterwards.
AddOutOfLineTrap(position,
WasmCode::kThrowWasmTrapDivUnrepresentable);
Label* div_by_zero = out_of_line_code_.end()[-2].label.get();
Label* div_unrepresentable = out_of_line_code_.end()[-1].label.get();
if (!__ emit_i64_divs(dst, lhs, rhs, div_by_zero,
div_unrepresentable)) {
ExternalReference ext_ref = ExternalReference::wasm_int64_div();
EmitDivOrRem64CCall(dst, lhs, rhs, ext_ref, div_by_zero,
div_unrepresentable);
}
});
break;
case WasmOpcode::kExprI64DivU:
EmitBinOp<kWasmI64, kWasmI64>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* div_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapDivByZero);
if (!__ emit_i64_divu(dst, lhs, rhs, div_by_zero)) {
ExternalReference ext_ref = ExternalReference::wasm_uint64_div();
EmitDivOrRem64CCall(dst, lhs, rhs, ext_ref, div_by_zero);
}
});
break;
case WasmOpcode::kExprI64RemS:
EmitBinOp<kWasmI64, kWasmI64>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* rem_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapRemByZero);
if (!__ emit_i64_rems(dst, lhs, rhs, rem_by_zero)) {
ExternalReference ext_ref = ExternalReference::wasm_int64_mod();
EmitDivOrRem64CCall(dst, lhs, rhs, ext_ref, rem_by_zero);
}
});
break;
case WasmOpcode::kExprI64RemU:
EmitBinOp<kWasmI64, kWasmI64>([this, decoder](LiftoffRegister dst,
LiftoffRegister lhs,
LiftoffRegister rhs) {
Label* rem_by_zero = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapRemByZero);
if (!__ emit_i64_remu(dst, lhs, rhs, rem_by_zero)) {
ExternalReference ext_ref = ExternalReference::wasm_uint64_mod();
EmitDivOrRem64CCall(dst, lhs, rhs, ext_ref, rem_by_zero);
}
});
break;
default:
return unsupported(decoder, WasmOpcodes::OpcodeName(opcode));
}
#undef CASE_I32_BINOP
#undef CASE_I64_BINOP
#undef CASE_FLOAT_BINOP
#undef CASE_I32_CMPOP
#undef CASE_I64_CMPOP
#undef CASE_F32_CMPOP
#undef CASE_F64_CMPOP
#undef CASE_I32_SHIFTOP
#undef CASE_I64_SHIFTOP
#undef CASE_CCALL_BINOP
}
void I32Const(FullDecoder* decoder, Value* result, int32_t value) {
__ cache_state()->stack_state.emplace_back(kWasmI32, value);
}
void I64Const(FullDecoder* decoder, Value* result, int64_t value) {
// The {VarState} stores constant values as int32_t, thus we only store
// 64-bit constants in this field if it fits in an int32_t. Larger values
// cannot be used as immediate value anyway, so we can also just put them in
// a register immediately.
int32_t value_i32 = static_cast<int32_t>(value);
if (value_i32 == value) {
__ cache_state()->stack_state.emplace_back(kWasmI64, value_i32);
} else {
LiftoffRegister reg = __ GetUnusedRegister(reg_class_for(kWasmI64));
__ LoadConstant(reg, WasmValue(value));
__ PushRegister(kWasmI64, reg);
}
}
void F32Const(FullDecoder* decoder, Value* result, float value) {
LiftoffRegister reg = __ GetUnusedRegister(kFpReg);
__ LoadConstant(reg, WasmValue(value));
__ PushRegister(kWasmF32, reg);
}
void F64Const(FullDecoder* decoder, Value* result, double value) {
LiftoffRegister reg = __ GetUnusedRegister(kFpReg);
__ LoadConstant(reg, WasmValue(value));
__ PushRegister(kWasmF64, reg);
}
void RefNull(FullDecoder* decoder, Value* result) {
unsupported(decoder, "ref_null");
}
void Drop(FullDecoder* decoder, const Value& value) {
auto& slot = __ cache_state()->stack_state.back();
// If the dropped slot contains a register, decrement it's use count.
if (slot.is_reg()) __ cache_state()->dec_used(slot.reg());
__ cache_state()->stack_state.pop_back();
}
void DoReturn(FullDecoder* 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");
LiftoffRegister reg = __ PopToRegister();
LiftoffRegister return_reg =
kNeedI64RegPair && values[0].type == kWasmI64
? LiftoffRegister::ForPair(kGpReturnRegisters[0],
kGpReturnRegisters[1])
: reg_class_for(values[0].type) == kGpReg
? LiftoffRegister(kGpReturnRegisters[0])
: LiftoffRegister(kFpReturnRegisters[0]);
if (reg != return_reg) __ Move(return_reg, reg, values[0].type);
}
__ LeaveFrame(StackFrame::WASM_COMPILED);
__ DropStackSlotsAndRet(
static_cast<uint32_t>(descriptor_->StackParameterCount()));
}
void GetLocal(FullDecoder* decoder, Value* result,
const LocalIndexImmediate<validate>& imm) {
auto& slot = __ cache_state()->stack_state[imm.index];
DCHECK_EQ(slot.type(), imm.type);
switch (slot.loc()) {
case kRegister:
__ PushRegister(slot.type(), slot.reg());
break;
case KIntConst:
__ cache_state()->stack_state.emplace_back(imm.type, slot.i32_const());
break;
case kStack: {
auto rc = reg_class_for(imm.type);
LiftoffRegister reg = __ GetUnusedRegister(rc);
__ Fill(reg, imm.index, imm.type);
__ PushRegister(slot.type(), reg);
break;
}
}
}
void SetLocalFromStackSlot(LiftoffAssembler::VarState& dst_slot,
uint32_t local_index) {
auto& state = *__ cache_state();
ValueType type = dst_slot.type();
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, type);
return;
}
state.dec_used(slot_reg);
dst_slot.MakeStack();
}
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, type);
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:
if (target_slot.is_reg()) state.dec_used(target_slot.reg());
target_slot = source_slot;
if (is_tee) state.inc_used(target_slot.reg());
break;
case KIntConst:
if (target_slot.is_reg()) state.dec_used(target_slot.reg());
target_slot = source_slot;
break;
case kStack:
SetLocalFromStackSlot(target_slot, local_index);
break;
}
if (!is_tee) __ cache_state()->stack_state.pop_back();
}
void SetLocal(FullDecoder* decoder, const Value& value,
const LocalIndexImmediate<validate>& imm) {
SetLocal(imm.index, false);
}
void TeeLocal(FullDecoder* decoder, const Value& value, Value* result,
const LocalIndexImmediate<validate>& imm) {
SetLocal(imm.index, true);
}
Register GetGlobalBaseAndOffset(const WasmGlobal* global,
LiftoffRegList& pinned, uint32_t* offset) {
Register addr = pinned.set(__ GetUnusedRegister(kGpReg)).gp();
if (global->mutability && global->imported) {
LOAD_INSTANCE_FIELD(addr, ImportedMutableGlobals, kPointerSize);
__ Load(LiftoffRegister(addr), addr, no_reg,
global->index * sizeof(Address), kPointerLoadType, pinned);
*offset = 0;
} else {
LOAD_INSTANCE_FIELD(addr, GlobalsStart, kPointerSize);
*offset = global->offset;
}
return addr;
}
void GetGlobal(FullDecoder* decoder, Value* result,
const GlobalIndexImmediate<validate>& imm) {
const auto* global = &env_->module->globals[imm.index];
if (!CheckSupportedType(decoder, kTypes_ilfd, global->type, "global"))
return;
LiftoffRegList pinned;
uint32_t offset = 0;
Register addr = GetGlobalBaseAndOffset(global, pinned, &offset);
LiftoffRegister value =
pinned.set(__ GetUnusedRegister(reg_class_for(global->type), pinned));
LoadType type = LoadType::ForValueType(global->type);
__ Load(value, addr, no_reg, offset, type, pinned, nullptr, true);
__ PushRegister(global->type, value);
}
void SetGlobal(FullDecoder* decoder, const Value& value,
const GlobalIndexImmediate<validate>& imm) {
auto* global = &env_->module->globals[imm.index];
if (!CheckSupportedType(decoder, kTypes_ilfd, global->type, "global"))
return;
LiftoffRegList pinned;
uint32_t offset = 0;
Register addr = GetGlobalBaseAndOffset(global, pinned, &offset);
LiftoffRegister reg = pinned.set(__ PopToRegister(pinned));
StoreType type = StoreType::ForValueType(global->type);
__ Store(addr, no_reg, offset, reg, type, {}, nullptr, true);
}
void Unreachable(FullDecoder* decoder) {
Label* unreachable_label = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapUnreachable);
__ emit_jump(unreachable_label);
__ AssertUnreachable(AbortReason::kUnexpectedReturnFromWasmTrap);
}
void Select(FullDecoder* decoder, const Value& cond, const Value& fval,
const Value& tval, Value* result) {
LiftoffRegList pinned;
Register condition = pinned.set(__ PopToRegister()).gp();
ValueType type = __ cache_state()->stack_state.end()[-1].type();
DCHECK_EQ(type, __ cache_state()->stack_state.end()[-2].type());
LiftoffRegister false_value = pinned.set(__ PopToRegister(pinned));
LiftoffRegister true_value = __ PopToRegister(pinned);
LiftoffRegister dst =
__ GetUnusedRegister(true_value.reg_class(), {true_value, false_value});
__ PushRegister(type, dst);
// Now emit the actual code to move either {true_value} or {false_value}
// into {dst}.
Label cont;
Label case_false;
__ emit_cond_jump(kEqual, &case_false, kWasmI32, condition);
if (dst != true_value) __ Move(dst, true_value, type);
__ emit_jump(&cont);
__ bind(&case_false);
if (dst != false_value) __ Move(dst, false_value, type);
__ bind(&cont);
}
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(FullDecoder* decoder, Control* target) { Br(target); }
void BrIf(FullDecoder* decoder, const Value& cond, Control* target) {
Label cont_false;
Register value = __ PopToRegister().gp();
__ emit_cond_jump(kEqual, &cont_false, kWasmI32, value);
Br(target);
__ bind(&cont_false);
}
// Generate a branch table case, potentially reusing previously generated
// stack transfer code.
void GenerateBrCase(FullDecoder* decoder, uint32_t br_depth,
std::map<uint32_t, MovableLabel>& br_targets) {
MovableLabel& label = br_targets[br_depth];
if (label.get()->is_bound()) {
__ jmp(label.get());
} else {
__ bind(label.get());
Br(decoder->control_at(br_depth));
}
}
// Generate a branch table for input in [min, max).
// TODO(wasm): Generate a real branch table (like TF TableSwitch).
void GenerateBrTable(FullDecoder* decoder, LiftoffRegister tmp,
LiftoffRegister value, uint32_t min, uint32_t max,
BranchTableIterator<validate>& table_iterator,
std::map<uint32_t, MovableLabel>& br_targets) {
DCHECK_LT(min, max);
// Check base case.
if (max == min + 1) {
DCHECK_EQ(min, table_iterator.cur_index());
GenerateBrCase(decoder, table_iterator.next(), br_targets);
return;
}
uint32_t split = min + (max - min) / 2;
Label upper_half;
__ LoadConstant(tmp, WasmValue(split));
__ emit_cond_jump(kUnsignedGreaterEqual, &upper_half, kWasmI32, value.gp(),
tmp.gp());
// Emit br table for lower half:
GenerateBrTable(decoder, tmp, value, min, split, table_iterator,
br_targets);
__ bind(&upper_half);
// Emit br table for upper half:
GenerateBrTable(decoder, tmp, value, split, max, table_iterator,
br_targets);
}
void BrTable(FullDecoder* decoder, const BranchTableImmediate<validate>& imm,
const Value& key) {
LiftoffRegList pinned;
LiftoffRegister value = pinned.set(__ PopToRegister());
BranchTableIterator<validate> table_iterator(decoder, imm);
std::map<uint32_t, MovableLabel> br_targets;
if (imm.table_count > 0) {
LiftoffRegister tmp = __ GetUnusedRegister(kGpReg, pinned);
__ LoadConstant(tmp, WasmValue(uint32_t{imm.table_count}));
Label case_default;
__ emit_cond_jump(kUnsignedGreaterEqual, &case_default, kWasmI32,
value.gp(), tmp.gp());
GenerateBrTable(decoder, tmp, value, 0, imm.table_count, table_iterator,
br_targets);
__ bind(&case_default);
}
// Generate the default case.
GenerateBrCase(decoder, table_iterator.next(), br_targets);
DCHECK(!table_iterator.has_next());
}
void Else(FullDecoder* 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(WasmCodePosition position,
WasmCode::RuntimeStubId stub, uint32_t pc = 0) {
DCHECK(!FLAG_wasm_no_bounds_checks);
// The pc is needed for memory OOB trap with trap handler enabled. Other
// callers should not even compute it.
DCHECK_EQ(pc != 0, stub == WasmCode::kThrowWasmTrapMemOutOfBounds &&
env_->use_trap_handler);
out_of_line_code_.push_back(OutOfLineCode::Trap(stub, position, pc));
return out_of_line_code_.back().label.get();
}
// Returns true if the memory access is statically known to be out of bounds
// (a jump to the trap was generated then); return false otherwise.
bool BoundsCheckMem(FullDecoder* decoder, uint32_t access_size,
uint32_t offset, Register index, LiftoffRegList pinned) {
const bool statically_oob = access_size > env_->max_memory_size ||
offset > env_->max_memory_size - access_size;
if (!statically_oob &&
(FLAG_wasm_no_bounds_checks || env_->use_trap_handler)) {
return false;
}
// TODO(wasm): This adds protected instruction information for the jump
// instruction we are about to generate. It would be better to just not add
// protected instruction info when the pc is 0.
Label* trap_label = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapMemOutOfBounds,
env_->use_trap_handler ? __ pc_offset() : 0);
if (statically_oob) {
__ emit_jump(trap_label);
Control* current_block = decoder->control_at(0);
if (current_block->reachable()) {
current_block->reachability = kSpecOnlyReachable;
}
return true;
}
DCHECK(!env_->use_trap_handler);
DCHECK(!FLAG_wasm_no_bounds_checks);
uint64_t end_offset = uint64_t{offset} + access_size - 1u;
// 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));
Register mem_size = __ GetUnusedRegister(kGpReg, pinned).gp();
LOAD_INSTANCE_FIELD(mem_size, MemorySize, kPointerSize);
if (kPointerSize == 8) {
__ LoadConstant(end_offset_reg, WasmValue(end_offset));
} else {
__ LoadConstant(end_offset_reg,
WasmValue(static_cast<uint32_t>(end_offset)));
}
if (end_offset >= env_->min_memory_size) {
__ emit_cond_jump(kUnsignedGreaterEqual, trap_label,
LiftoffAssembler::kWasmIntPtr, end_offset_reg.gp(),
mem_size);
}
// Just reuse the end_offset register for computing the effective size.
LiftoffRegister effective_size_reg = end_offset_reg;
__ emit_ptrsize_sub(effective_size_reg.gp(), mem_size, end_offset_reg.gp());
__ emit_i32_to_intptr(index, index);
__ emit_cond_jump(kUnsignedGreaterEqual, trap_label,
LiftoffAssembler::kWasmIntPtr, index,
effective_size_reg.gp());
return false;
}
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 MemoryTracingInfo.
LiftoffRegister info = pinned.set(__ GetUnusedRegister(kGpReg, pinned));
// Allocate stack slot for MemoryTracingInfo.
__ AllocateStackSlot(info.gp(), sizeof(MemoryTracingInfo));
// Now store all information into the MemoryTracingInfo struct.
__ Store(info.gp(), no_reg, offsetof(MemoryTracingInfo, address), address,
StoreType::kI32Store, pinned);
__ LoadConstant(address, WasmValue(is_store ? 1 : 0));
__ Store(info.gp(), no_reg, offsetof(MemoryTracingInfo, is_store), address,
StoreType::kI32Store8, pinned);
__ LoadConstant(address, WasmValue(static_cast<int>(rep)));
__ Store(info.gp(), no_reg, offsetof(MemoryTracingInfo, mem_rep), address,
StoreType::kI32Store8, pinned);
source_position_table_builder_.AddPosition(__ pc_offset(),
SourcePosition(position), false);
Register args[] = {info.gp()};
GenerateRuntimeCall(Runtime::kWasmTraceMemory, arraysize(args), args);
__ DeallocateStackSlot(sizeof(MemoryTracingInfo));
}
void GenerateRuntimeCall(Runtime::FunctionId runtime_function, int num_args,
Register* args) {
auto call_descriptor = compiler::Linkage::GetRuntimeCallDescriptor(
compilation_zone_, runtime_function, 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 =
call_descriptor->GetInputLocation(kInputShift);
if (param_loc.IsRegister()) {
Register reg = Register::from_code(param_loc.AsRegister());
__ Move(LiftoffRegister(reg), LiftoffRegister(args[0]),
LiftoffAssembler::kWasmIntPtr);
} else {
DCHECK(param_loc.IsCallerFrameSlot());
LiftoffStackSlots stack_slots(&asm_);
stack_slots.Add(LiftoffAssembler::VarState(LiftoffAssembler::kWasmIntPtr,
LiftoffRegister(args[0])));
stack_slots.Construct();
}
// Set context to "no context" for the runtime call.
__ TurboAssembler::Move(kContextRegister,
Smi::FromInt(Context::kNoContext));
Register centry = kJavaScriptCallCodeStartRegister;
LOAD_INSTANCE_FIELD(centry, CEntryStub, kPointerSize);
__ CallRuntimeWithCEntry(runtime_function, centry);
safepoint_table_builder_.DefineSafepoint(&asm_, Safepoint::kSimple, 0,
Safepoint::kNoLazyDeopt);
}
Register AddMemoryMasking(Register index, uint32_t* offset,
LiftoffRegList& pinned) {
if (!FLAG_untrusted_code_mitigations || env_->use_trap_handler) {
return index;
}
DEBUG_CODE_COMMENT("Mask memory index");
// Make sure that we can overwrite {index}.
if (__ cache_state()->is_used(LiftoffRegister(index))) {
Register old_index = index;
pinned.clear(LiftoffRegister(old_index));
index = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
if (index != old_index) __ Move(index, old_index, kWasmI32);
}
Register tmp = __ GetUnusedRegister(kGpReg, pinned).gp();
__ LoadConstant(LiftoffRegister(tmp), WasmValue(*offset));
__ emit_ptrsize_add(index, index, tmp);
LOAD_INSTANCE_FIELD(tmp, MemoryMask, kPointerSize);
__ emit_ptrsize_and(index, index, tmp);
*offset = 0;
return index;
}
void LoadMem(FullDecoder* decoder, LoadType type,
const MemoryAccessImmediate<validate>& imm,
const Value& index_val, Value* result) {
ValueType value_type = type.value_type();
if (!CheckSupportedType(decoder, kTypes_ilfd, value_type, "load")) return;
LiftoffRegList pinned;
Register index = pinned.set(__ PopToRegister()).gp();
if (BoundsCheckMem(decoder, type.size(), imm.offset, index, pinned)) {
return;
}
uint32_t offset = imm.offset;
index = AddMemoryMasking(index, &offset, pinned);
DEBUG_CODE_COMMENT("Load from memory");
Register addr = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
LOAD_INSTANCE_FIELD(addr, MemoryStart, 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, offset, type, pinned, &protected_load_pc, true);
if (env_->use_trap_handler) {
AddOutOfLineTrap(decoder->position(),
WasmCode::kThrowWasmTrapMemOutOfBounds,
protected_load_pc);
}
__ PushRegister(value_type, value);
if (FLAG_trace_wasm_memory) {
TraceMemoryOperation(false, type.mem_type().representation(), index,
offset, decoder->position());
}
}
void StoreMem(FullDecoder* decoder, StoreType type,
const MemoryAccessImmediate<validate>& imm,
const Value& index_val, const Value& value_val) {
ValueType value_type = type.value_type();
if (!CheckSupportedType(decoder, kTypes_ilfd, value_type, "store")) return;
LiftoffRegList pinned;
LiftoffRegister value = pinned.set(__ PopToRegister());
Register index = pinned.set(__ PopToRegister(pinned)).gp();
if (BoundsCheckMem(decoder, type.size(), imm.offset, index, pinned)) {
return;
}
uint32_t offset = imm.offset;
index = AddMemoryMasking(index, &offset, pinned);
DEBUG_CODE_COMMENT("Store to memory");
Register addr = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
LOAD_INSTANCE_FIELD(addr, MemoryStart, kPointerSize);
uint32_t protected_store_pc = 0;
LiftoffRegList outer_pinned;
if (FLAG_trace_wasm_memory) outer_pinned.set(index);
__ Store(addr, index, offset, value, type, outer_pinned,
&protected_store_pc, true);
if (env_->use_trap_handler) {
AddOutOfLineTrap(decoder->position(),
WasmCode::kThrowWasmTrapMemOutOfBounds,
protected_store_pc);
}
if (FLAG_trace_wasm_memory) {
TraceMemoryOperation(true, type.mem_rep(), index, offset,
decoder->position());
}
}
void CurrentMemoryPages(FullDecoder* decoder, Value* result) {
Register mem_size = __ GetUnusedRegister(kGpReg).gp();
LOAD_INSTANCE_FIELD(mem_size, MemorySize, kPointerSize);
__ emit_ptrsize_shr(mem_size, mem_size, kWasmPageSizeLog2);
__ PushRegister(kWasmI32, LiftoffRegister(mem_size));
}
void MemoryGrow(FullDecoder* decoder, const Value& value, Value* result_val) {
// Pop the input, then spill all cache registers to make the runtime call.
LiftoffRegList pinned;
LiftoffRegister input = pinned.set(__ PopToRegister());
__ SpillAllRegisters();
constexpr Register kGpReturnReg = kGpReturnRegisters[0];
static_assert(kLiftoffAssemblerGpCacheRegs & Register::bit<kGpReturnReg>(),
"first return register is a cache register (needs more "
"complex code here otherwise)");
LiftoffRegister result = pinned.set(LiftoffRegister(kGpReturnReg));
WasmMemoryGrowDescriptor descriptor;
DCHECK_EQ(0, descriptor.GetStackParameterCount());
DCHECK_EQ(1, descriptor.GetRegisterParameterCount());
DCHECK_EQ(ValueTypes::MachineTypeFor(kWasmI32),
descriptor.GetParameterType(0));
Register param_reg = descriptor.GetRegisterParameter(0);
if (input.gp() != param_reg) __ Move(param_reg, input.gp(), kWasmI32);
__ CallRuntimeStub(WasmCode::kWasmMemoryGrow);
safepoint_table_builder_.DefineSafepoint(&asm_, Safepoint::kSimple, 0,
Safepoint::kNoLazyDeopt);
if (kReturnRegister0 != result.gp()) {
__ Move(result.gp(), kReturnRegister0, kWasmI32);
}
__ PushRegister(kWasmI32, result);
}
void CallDirect(FullDecoder* decoder,
const CallFunctionImmediate<validate>& imm,
const Value args[], Value returns[]) {
if (imm.sig->return_count() > 1)
return unsupported(decoder, "multi-return");
if (imm.sig->return_count() == 1 &&
!CheckSupportedType(decoder, kTypes_ilfd, imm.sig->GetReturn(0),
"return"))
return;
auto call_descriptor =
compiler::GetWasmCallDescriptor(compilation_zone_, imm.sig);
call_descriptor =
GetLoweredCallDescriptor(compilation_zone_, call_descriptor);
if (imm.index < env_->module->num_imported_functions) {
// A direct call to an imported function.
LiftoffRegList pinned;
Register tmp = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
Register target = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
Register imported_targets = tmp;
LOAD_INSTANCE_FIELD(imported_targets, ImportedFunctionTargets,
kPointerSize);
__ Load(LiftoffRegister(target), imported_targets, no_reg,
imm.index * sizeof(Address), kPointerLoadType, pinned);
Register imported_function_refs = tmp;
LOAD_INSTANCE_FIELD(imported_function_refs, ImportedFunctionRefs,
kPointerSize);
Register imported_function_ref = tmp;
__ Load(LiftoffRegister(imported_function_ref), imported_function_refs,
no_reg, ObjectAccess::ElementOffsetInTaggedFixedArray(imm.index),
kPointerLoadType, pinned);
Register* explicit_instance = &imported_function_ref;
__ PrepareCall(imm.sig, call_descriptor, &target, explicit_instance);
source_position_table_builder_.AddPosition(
__ pc_offset(), SourcePosition(decoder->position()), false);
__ CallIndirect(imm.sig, call_descriptor, target);
safepoint_table_builder_.DefineSafepoint(&asm_, Safepoint::kSimple, 0,
Safepoint::kNoLazyDeopt);
__ FinishCall(imm.sig, call_descriptor);
} else {
// A direct call within this module just gets the current instance.
__ PrepareCall(imm.sig, call_descriptor);
source_position_table_builder_.AddPosition(
__ pc_offset(), SourcePosition(decoder->position()), false);
// Just encode the function index. This will be patched at instantiation.
Address addr = static_cast<Address>(imm.index);
__ CallNativeWasmCode(addr);
safepoint_table_builder_.DefineSafepoint(&asm_, Safepoint::kSimple, 0,
Safepoint::kNoLazyDeopt);
__ FinishCall(imm.sig, call_descriptor);
}
}
void CallIndirect(FullDecoder* decoder, const Value& index_val,
const CallIndirectImmediate<validate>& imm,
const Value args[], Value returns[]) {
if (imm.sig->return_count() > 1) {
return unsupported(decoder, "multi-return");
}
if (imm.sig->return_count() == 1 &&
!CheckSupportedType(decoder, kTypes_ilfd, imm.sig->GetReturn(0),
"return")) {
return;
}
// Pop the index.
Register index = __ PopToRegister().gp();
// If that register is still being used after popping, we move it to another
// register, because we want to modify that register.
if (__ cache_state()->is_used(LiftoffRegister(index))) {
Register new_index =
__ GetUnusedRegister(kGpReg, LiftoffRegList::ForRegs(index)).gp();
__ Move(new_index, index, kWasmI32);
index = new_index;
}
LiftoffRegList pinned = LiftoffRegList::ForRegs(index);
// Get three temporary registers.
Register table = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
Register tmp_const = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
Register scratch = pinned.set(__ GetUnusedRegister(kGpReg, pinned)).gp();
// Bounds check against the table size.
Label* invalid_func_label = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapFuncInvalid);
uint32_t canonical_sig_num = env_->module->signature_ids[imm.sig_index];
DCHECK_GE(canonical_sig_num, 0);
DCHECK_GE(kMaxInt, canonical_sig_num);
// Compare against table size stored in
// {instance->indirect_function_table_size}.
LOAD_INSTANCE_FIELD(tmp_const, IndirectFunctionTableSize, kUInt32Size);
__ emit_cond_jump(kUnsignedGreaterEqual, invalid_func_label, kWasmI32,
index, tmp_const);
// Mask the index to prevent SSCA.
if (FLAG_untrusted_code_mitigations) {
DEBUG_CODE_COMMENT("Mask indirect call index");
// mask = ((index - size) & ~index) >> 31
// Reuse allocated registers; note: size is still stored in {tmp_const}.
Register diff = table;
Register neg_index = tmp_const;
Register mask = scratch;
// 1) diff = index - size
__ emit_i32_sub(diff, index, tmp_const);
// 2) neg_index = ~index
__ LoadConstant(LiftoffRegister(neg_index), WasmValue(int32_t{-1}));
__ emit_i32_xor(neg_index, neg_index, index);
// 3) mask = diff & neg_index
__ emit_i32_and(mask, diff, neg_index);
// 4) mask = mask >> 31
__ LoadConstant(LiftoffRegister(tmp_const), WasmValue(int32_t{31}));
__ emit_i32_sar(mask, mask, tmp_const, pinned);
// Apply mask.
__ emit_i32_and(index, index, mask);
}
DEBUG_CODE_COMMENT("Check indirect call signature");
// Load the signature from {instance->ift_sig_ids[key]}
LOAD_INSTANCE_FIELD(table, IndirectFunctionTableSigIds, kPointerSize);
__ LoadConstant(LiftoffRegister(tmp_const),
WasmValue(static_cast<uint32_t>(sizeof(uint32_t))));
// TODO(wasm): use a emit_i32_shli() instead of a multiply.
// (currently cannot use shl on ia32/x64 because it clobbers %rcx).
__ emit_i32_mul(index, index, tmp_const);
__ Load(LiftoffRegister(scratch), table, index, 0, LoadType::kI32Load,
pinned);
// Compare against expected signature.
__ LoadConstant(LiftoffRegister(tmp_const), WasmValue(canonical_sig_num));
Label* sig_mismatch_label = AddOutOfLineTrap(
decoder->position(), WasmCode::kThrowWasmTrapFuncSigMismatch);
__ emit_cond_jump(kUnequal, sig_mismatch_label,
LiftoffAssembler::kWasmIntPtr, scratch, tmp_const);
DEBUG_CODE_COMMENT("Execute indirect call");
if (kPointerSize == 8) {
// {index} has already been multiplied by 4. Multiply by another 2.
__ LoadConstant(LiftoffRegister(tmp_const), WasmValue(2));
__ emit_i32_mul(index, index, tmp_const);
}
// Load the target from {instance->ift_targets[key]}
LOAD_INSTANCE_FIELD(table, IndirectFunctionTableTargets, kPointerSize);
__ Load(LiftoffRegister(scratch), table, index, 0, kPointerLoadType,
pinned);
// Load the instance from {instance->ift_instances[key]}
LOAD_INSTANCE_FIELD(table, IndirectFunctionTableRefs, kPointerSize);
__ Load(LiftoffRegister(tmp_const), table, index,
ObjectAccess::ElementOffsetInTaggedFixedArray(0), kPointerLoadType,
pinned);
Register* explicit_instance = &tmp_const;
source_position_table_builder_.AddPosition(
__ pc_offset(), SourcePosition(decoder->position()), false);
auto call_descriptor =
compiler::GetWasmCallDescriptor(compilation_zone_, imm.sig);
call_descriptor =
GetLoweredCallDescriptor(compilation_zone_, call_descriptor);
Register target = scratch;
__ PrepareCall(imm.sig, call_descriptor, &target, explicit_instance);
__ CallIndirect(imm.sig, call_descriptor, target);
safepoint_table_builder_.DefineSafepoint(&asm_, Safepoint::kSimple, 0,
Safepoint::kNoLazyDeopt);
__ FinishCall(imm.sig, call_descriptor);
}
void SimdOp(FullDecoder* decoder, WasmOpcode opcode, Vector<Value> args,
Value* result) {
unsupported(decoder, "simd");
}
void SimdLaneOp(FullDecoder* decoder, WasmOpcode opcode,
const SimdLaneImmediate<validate>& imm,
const Vector<Value> inputs, Value* result) {
unsupported(decoder, "simd");
}
void SimdShiftOp(FullDecoder* decoder, WasmOpcode opcode,
const SimdShiftImmediate<validate>& imm, const Value& input,
Value* result) {
unsupported(decoder, "simd");
}
void Simd8x16ShuffleOp(FullDecoder* decoder,
const Simd8x16ShuffleImmediate<validate>& imm,
const Value& input0, const Value& input1,
Value* result) {
unsupported(decoder, "simd");
}
void Throw(FullDecoder* decoder, const ExceptionIndexImmediate<validate>&,
const Vector<Value>& args) {
unsupported(decoder, "throw");
}
void Rethrow(FullDecoder* decoder, Control* block) {
unsupported(decoder, "rethrow");
}
void CatchException(FullDecoder* decoder,
const ExceptionIndexImmediate<validate>& imm,
Control* block, Vector<Value> caught_values) {
unsupported(decoder, "catch");
}
void CatchAll(FullDecoder* decoder, Control* block) {
unsupported(decoder, "catch-all");
}
void AtomicOp(FullDecoder* decoder, WasmOpcode opcode, Vector<Value> args,
const MemoryAccessImmediate<validate>& imm, Value* result) {
unsupported(decoder, "atomicop");
}
private:
LiftoffAssembler asm_;
compiler::CallDescriptor* const descriptor_;
CompilationEnv* const env_;
bool ok_ = true;
std::vector<OutOfLineCode> out_of_line_code_;
SourcePositionTableBuilder 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_;
SafepointTableBuilder safepoint_table_builder_;
// The pc offset of the instructions to reserve the stack frame. Needed to
// patch the actually needed stack size in the end.
uint32_t pc_offset_stack_frame_construction_ = 0;
void TraceCacheState(FullDecoder* decoder) const {
#ifdef DEBUG
if (!FLAG_trace_liftoff || !FLAG_trace_wasm_decoder) return;
StdoutStream os;
for (int control_depth = decoder->control_depth() - 1; control_depth >= -1;
--control_depth) {
auto* cache_state =
control_depth == -1 ? __ cache_state()
: &decoder->control_at(control_depth)
->label_state;
os << PrintCollection(cache_state->stack_state);
if (control_depth != -1) PrintF("; ");
}
os << "\n";
#endif
}
DISALLOW_IMPLICIT_CONSTRUCTORS(LiftoffCompiler);
};
} // namespace
bool LiftoffCompilationUnit::ExecuteCompilation(CompilationEnv* env,
const FunctionBody& func_body,
Counters* counters,
WasmFeatures* detected) {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm"),
"ExecuteLiftoffCompilation");
base::ElapsedTimer compile_timer;
if (FLAG_trace_wasm_decode_time) {
compile_timer.Start();
}
Zone zone(wasm_unit_->wasm_engine_->allocator(), "LiftoffCompilationZone");
const WasmModule* module = env ? env->module : nullptr;
auto call_descriptor = compiler::GetWasmCallDescriptor(&zone, func_body.sig);
base::Optional<TimedHistogramScope> liftoff_compile_time_scope(
base::in_place, counters->liftoff_compile_time());
WasmFullDecoder<Decoder::kValidate, LiftoffCompiler> decoder(
&zone, module, wasm_unit_->native_module_->enabled_features(), detected,
func_body, call_descriptor, env, &zone);
decoder.Decode();
liftoff_compile_time_scope.reset();
LiftoffCompiler* compiler = &decoder.interface();
if (decoder.failed()) return false; // validation error
if (!compiler->ok()) {
// Liftoff compilation failed.
counters->liftoff_unsupported_functions()->Increment();
return false;
}
counters->liftoff_compiled_functions()->Increment();
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);
}
CodeDesc desc;
compiler->GetCode(&desc);
OwnedVector<byte> source_positions = compiler->GetSourcePositionTable();
OwnedVector<trap_handler::ProtectedInstructionData> protected_instructions =
compiler->GetProtectedInstructions();
uint32_t frame_slot_count = compiler->GetTotalFrameSlotCount();
int safepoint_table_offset = compiler->GetSafepointTableOffset();
WasmCode* code = wasm_unit_->native_module_->AddCode(
wasm_unit_->func_index_, desc, frame_slot_count, safepoint_table_offset,
0, std::move(protected_instructions), std::move(source_positions),
WasmCode::kLiftoff);
wasm_unit_->SetResult(code, counters);
return true;
}
#undef __
#undef TRACE
#undef WASM_INSTANCE_OBJECT_OFFSET
#undef WASM_INSTANCE_OBJECT_SIZE
#undef LOAD_INSTANCE_FIELD
#undef DEBUG_CODE_COMMENT
} // namespace wasm
} // namespace internal
} // namespace v8