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sdk/pkg/vm/lib/bytecode/dbc.dart
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Alexander Markov 5920048fa2 [vm,aot,bytecode] Handle direct-call metadata when generating bytecode 
AOT transformations add vm.direct-call.metadata with devirtualization
information to AST nodes.

Bytecode generator should take this information into account when
generating bytecode in case of AOT. Bytecode format is extended with
CheckReceiverForNull and UncheckedDirectCall instructions, and
DirectCallViaDynamicForwarder constant pool entry in order to represent
devirtualized calls.

Change-Id: I697432ddd0b58d2d0413715132ba5e90eb606ec1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119201
Reviewed-by: Régis Crelier <regis@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
2019-10-01 00:20:48 +00:00

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// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Dart kernel bytecode instructions (described in runtime/vm/constants_kbc.h).
library vm.bytecode.dbc;
/// Version of bytecode format, produced by default.
/// Before bumping current bytecode version format, make sure that
/// all users have switched to a VM which is able to consume new
/// version of bytecode.
const int currentBytecodeFormatVersion = 21;
enum Opcode {
kUnusedOpcode000,
kUnusedOpcode001,
kUnusedOpcode002,
kUnusedOpcode003,
kUnusedOpcode004,
kUnusedOpcode005,
kUnusedOpcode006,
kUnusedOpcode007,
kUnusedOpcode008,
kUnusedOpcode009,
kUnusedOpcode010,
kUnusedOpcode011,
kUnusedOpcode012,
kUnusedOpcode013,
kUnusedOpcode014,
kUnusedOpcode015,
kUnusedOpcode016,
kUnusedOpcode017,
kUnusedOpcode018,
kUnusedOpcode019,
kUnusedOpcode020,
kUnusedOpcode021,
kUnusedOpcode022,
kUnusedOpcode023,
kUnusedOpcode024,
kUnusedOpcode025,
kUnusedOpcode026,
kUnusedOpcode027,
kUnusedOpcode028,
kUnusedOpcode029,
kUnusedOpcode030,
kUnusedOpcode031,
kUnusedOpcode032,
kUnusedOpcode033,
kUnusedOpcode034,
kUnusedOpcode035,
kUnusedOpcode036,
kUnusedOpcode037,
kUnusedOpcode038,
kUnusedOpcode039,
kUnusedOpcode040,
kUnusedOpcode041,
kUnusedOpcode042,
kUnusedOpcode043,
kUnusedOpcode044,
kUnusedOpcode045,
kUnusedOpcode046,
kUnusedOpcode047,
kUnusedOpcode048,
kUnusedOpcode049,
kUnusedOpcode050,
kUnusedOpcode051,
kUnusedOpcode052,
kUnusedOpcode053,
kUnusedOpcode054,
kUnusedOpcode055,
kUnusedOpcode056,
kUnusedOpcode057,
kUnusedOpcode058,
kUnusedOpcode059,
kUnusedOpcode060,
kUnusedOpcode061,
kUnusedOpcode062,
kUnusedOpcode063,
kUnusedOpcode064,
kUnusedOpcode065,
kUnusedOpcode066,
kUnusedOpcode067,
kUnusedOpcode068,
kUnusedOpcode069,
kUnusedOpcode070,
kUnusedOpcode071,
kUnusedOpcode072,
kUnusedOpcode073,
kUnusedOpcode074,
kUnusedOpcode075,
kUnusedOpcode076,
kUnusedOpcode077,
kUnusedOpcode078,
kUnusedOpcode079,
kUnusedOpcode080,
kUnusedOpcode081,
kUnusedOpcode082,
kUnusedOpcode083,
kUnusedOpcode084,
kTrap,
// Prologue and stack management.
kEntry,
kEntry_Wide,
kEntryFixed,
kEntryFixed_Wide,
kEntryOptional,
kUnused00, // Reserved for EntryNoLocals.
kLoadConstant,
kLoadConstant_Wide,
kFrame,
kFrame_Wide,
kCheckFunctionTypeArgs,
kCheckFunctionTypeArgs_Wide,
kCheckStack,
kDebugCheck,
kJumpIfUnchecked,
kJumpIfUnchecked_Wide,
// Object allocation.
kAllocate,
kAllocate_Wide,
kAllocateT,
kCreateArrayTOS,
kAllocateClosure,
kAllocateClosure_Wide,
// Context allocation and access.
kAllocateContext,
kAllocateContext_Wide,
kCloneContext,
kCloneContext_Wide,
kLoadContextParent,
kStoreContextParent,
kLoadContextVar,
kLoadContextVar_Wide,
kUnused04, // Reserved for LoadContextVar0
kUnused05,
kStoreContextVar,
kStoreContextVar_Wide,
// Constants.
kPushConstant,
kPushConstant_Wide,
kUnused06, // Reserved for PushConstant0
kUnused07,
kPushTrue,
kPushFalse,
kPushInt,
kPushInt_Wide,
kUnused08, // Reserved for PushInt0
kUnused09, // Reserved for PushInt1
kUnused10, // Reserved for PushInt2
kUnused11,
kPushNull,
// Locals and expression stack.
kDrop1,
kPush,
kPush_Wide,
kUnused12, // Reserved for PushLocal0
kUnused13, // Reserved for PushLocal1
kUnused14, // Reserved for PushLocal2
kUnused15, // Reserved for PushLocal3
kUnused16, // Reserved for PushParamLast0
kUnused17, // Reserved for PushParamLast1
kPopLocal,
kPopLocal_Wide,
kLoadStatic,
kLoadStatic_Wide,
kStoreLocal,
kStoreLocal_Wide,
// Instance fields and arrays.
kLoadFieldTOS,
kLoadFieldTOS_Wide,
kStoreFieldTOS,
kStoreFieldTOS_Wide,
kStoreIndexedTOS,
kUnused20,
// Static fields.
kUnused40,
kUnused41,
kStoreStaticTOS,
kStoreStaticTOS_Wide,
// Jumps.
kJump,
kJump_Wide,
kJumpIfNoAsserts,
kJumpIfNoAsserts_Wide,
kJumpIfNotZeroTypeArgs,
kJumpIfNotZeroTypeArgs_Wide,
kJumpIfEqStrict,
kJumpIfEqStrict_Wide,
kJumpIfNeStrict,
kJumpIfNeStrict_Wide,
kJumpIfTrue,
kJumpIfTrue_Wide,
kJumpIfFalse,
kJumpIfFalse_Wide,
kJumpIfNull,
kJumpIfNull_Wide,
kJumpIfNotNull,
kJumpIfNotNull_Wide,
// Calls.
kDirectCall,
kDirectCall_Wide,
kUncheckedDirectCall,
kUncheckedDirectCall_Wide,
kInterfaceCall,
kInterfaceCall_Wide,
kUnused23, // Reserved for InterfaceCall1
kUnused24, // Reserved for InterfaceCall1_Wide
kInstantiatedInterfaceCall,
kInstantiatedInterfaceCall_Wide,
kUncheckedClosureCall,
kUncheckedClosureCall_Wide,
kUncheckedInterfaceCall,
kUncheckedInterfaceCall_Wide,
kDynamicCall,
kDynamicCall_Wide,
kNativeCall,
kNativeCall_Wide,
kReturnTOS,
kUnused29,
// Types and type checks.
kAssertAssignable,
kAssertAssignable_Wide,
kUnused30, // Reserved for AsSimpleType
kUnused31, // Reserved for AsSimpleType_Wide
kAssertBoolean,
kAssertSubtype,
kLoadTypeArgumentsField,
kLoadTypeArgumentsField_Wide,
kInstantiateType,
kInstantiateType_Wide,
kInstantiateTypeArgumentsTOS,
kInstantiateTypeArgumentsTOS_Wide,
kUnused32, // Reserved for IsType
kUnused33, // Reserved for IsType_Wide
kUnused34, // Reserved for IsSimpleType
kUnused35, // Reserved for IsSimpleType_Wide
// Exception handling.
kThrow,
kSetFrame,
kMoveSpecial,
kMoveSpecial_Wide,
// Bool operations.
kBooleanNegateTOS,
// Null operations.
kEqualsNull,
kCheckReceiverForNull,
kCheckReceiverForNull_Wide,
// Int operations.
kNegateInt,
kAddInt,
kSubInt,
kMulInt,
kTruncDivInt,
kModInt,
kBitAndInt,
kBitOrInt,
kBitXorInt,
kShlInt,
kShrInt,
kCompareIntEq,
kCompareIntGt,
kCompareIntLt,
kCompareIntGe,
kCompareIntLe,
// Double operations.
kNegateDouble,
kAddDouble,
kSubDouble,
kMulDouble,
kDivDouble,
kCompareDoubleEq,
kCompareDoubleGt,
kCompareDoubleLt,
kCompareDoubleGe,
kCompareDoubleLe,
}
/// Compact variants of opcodes are always even.
/// Wide variant = opcode + kWideModifier.
const int kWideModifier = 1;
/// Opcode should fit into 1 byte.
const int kMaxOpcodes = 256;
enum Encoding {
k0, // No operands.
kA, // 1 operand: A = 8-bit unsigned.
kD, // 1 operand: D = 8/32-bit unsigned.
kX, // 1 operand: X = 8/32-bit signed.
kT, // 1 operand: T = 8/24-bit signed.
kAE, // 2 operands: A = 8-bit unsigned, E = 8/32-bit unsigned
kAY, // 2 operands: A = 8-bit unsigned, Y = 8/32-bit signed
kDF, // 2 operands: D = 8/32-bit unsigned, F = 8-bit unsigned
kABC, // 3 operands: A, B, C - 8-bit unsigned.
}
int instructionSize(Encoding encoding, bool isWide) {
switch (encoding) {
case Encoding.k0:
return 1;
case Encoding.kA:
return 2;
case Encoding.kD:
return isWide ? 5 : 2;
case Encoding.kX:
return isWide ? 5 : 2;
case Encoding.kT:
return isWide ? 4 : 2;
case Encoding.kAE:
return isWide ? 6 : 3;
case Encoding.kAY:
return isWide ? 6 : 3;
case Encoding.kDF:
return isWide ? 6 : 3;
case Encoding.kABC:
return 4;
}
throw 'Unexpected instruction encoding $encoding';
}
enum Operand {
none, // ignored / non-existent operand
imm, // immediate operand
lit, // constant literal from object pool
reg, // register (unsigned FP relative local)
xeg, // x-register (signed FP relative local)
tgt, // jump target relative to the PC of the current instruction
spe, // SpecialIndex
}
class Format {
final Encoding encoding;
final List<Operand> operands;
const Format(this.encoding, this.operands);
}
const Map<Opcode, Format> BytecodeFormats = const {
Opcode.kTrap: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kEntry: const Format(
Encoding.kD, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kEntryFixed: const Format(
Encoding.kAE, const [Operand.imm, Operand.imm, Operand.none]),
Opcode.kEntryOptional: const Format(
Encoding.kABC, const [Operand.imm, Operand.imm, Operand.imm]),
Opcode.kLoadConstant: const Format(
Encoding.kAE, const [Operand.reg, Operand.lit, Operand.none]),
Opcode.kFrame: const Format(
Encoding.kD, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kCheckFunctionTypeArgs: const Format(
Encoding.kAE, const [Operand.imm, Operand.reg, Operand.none]),
Opcode.kCheckStack: const Format(
Encoding.kA, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kDebugCheck: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kAllocate: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kAllocateT: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCreateArrayTOS: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kAllocateContext: const Format(
Encoding.kAE, const [Operand.imm, Operand.imm, Operand.none]),
Opcode.kCloneContext: const Format(
Encoding.kAE, const [Operand.imm, Operand.imm, Operand.none]),
Opcode.kLoadContextParent: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kStoreContextParent: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kLoadContextVar: const Format(
Encoding.kAE, const [Operand.imm, Operand.imm, Operand.none]),
Opcode.kStoreContextVar: const Format(
Encoding.kAE, const [Operand.imm, Operand.imm, Operand.none]),
Opcode.kPushConstant: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kPushNull: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kPushTrue: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kPushFalse: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kPushInt: const Format(
Encoding.kX, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kDrop1: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kPush: const Format(
Encoding.kX, const [Operand.xeg, Operand.none, Operand.none]),
Opcode.kPopLocal: const Format(
Encoding.kX, const [Operand.xeg, Operand.none, Operand.none]),
Opcode.kStoreLocal: const Format(
Encoding.kX, const [Operand.xeg, Operand.none, Operand.none]),
Opcode.kLoadFieldTOS: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kStoreFieldTOS: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kStoreIndexedTOS: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kLoadStatic: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kStoreStaticTOS: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kJump: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfNoAsserts: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfNotZeroTypeArgs: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfEqStrict: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfNeStrict: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfTrue: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfFalse: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfNull: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfNotNull: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kJumpIfUnchecked: const Format(
Encoding.kT, const [Operand.tgt, Operand.none, Operand.none]),
Opcode.kInterfaceCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kInstantiatedInterfaceCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kDynamicCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kNativeCall: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kReturnTOS: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kAssertAssignable: const Format(
Encoding.kAE, const [Operand.imm, Operand.lit, Operand.none]),
Opcode.kAssertBoolean: const Format(
Encoding.kA, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kAssertSubtype: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kLoadTypeArgumentsField: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kInstantiateType: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kInstantiateTypeArgumentsTOS: const Format(
Encoding.kAE, const [Operand.imm, Operand.lit, Operand.none]),
Opcode.kThrow: const Format(
Encoding.kA, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kMoveSpecial: const Format(
Encoding.kAY, const [Operand.spe, Operand.xeg, Operand.none]),
Opcode.kSetFrame: const Format(
Encoding.kA, const [Operand.imm, Operand.none, Operand.none]),
Opcode.kBooleanNegateTOS: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kEqualsNull: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCheckReceiverForNull: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kNegateInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kAddInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kSubInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kMulInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kTruncDivInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kModInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kBitAndInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kBitOrInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kBitXorInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kShlInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kShrInt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareIntEq: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareIntGt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareIntLt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareIntGe: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareIntLe: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kDirectCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kUncheckedDirectCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kAllocateClosure: const Format(
Encoding.kD, const [Operand.lit, Operand.none, Operand.none]),
Opcode.kUncheckedClosureCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kUncheckedInterfaceCall: const Format(
Encoding.kDF, const [Operand.lit, Operand.imm, Operand.none]),
Opcode.kNegateDouble: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kAddDouble: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kSubDouble: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kMulDouble: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kDivDouble: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareDoubleEq: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareDoubleGt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareDoubleLt: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareDoubleGe: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
Opcode.kCompareDoubleLe: const Format(
Encoding.k0, const [Operand.none, Operand.none, Operand.none]),
};
// Should match constant in runtime/vm/stack_frame_dbc.h.
const int kParamEndSlotFromFp = 4;
enum SpecialIndex {
exception,
stackTrace,
}
/// Returns [true] if there is a wide variant for the given opcode.
bool hasWideVariant(Opcode opcode) {
final encoding = BytecodeFormats[opcode].encoding;
switch (encoding) {
case Encoding.k0:
case Encoding.kA:
case Encoding.kABC:
return false;
case Encoding.kD:
case Encoding.kX:
case Encoding.kT:
case Encoding.kAE:
case Encoding.kAY:
case Encoding.kDF:
return true;
}
throw 'Unexpected instruction encoding $encoding';
}
bool isWideOpcode(Opcode opcode) {
return (BytecodeFormats[opcode] == null) &&
hasWideVariant(Opcode.values[opcode.index - kWideModifier]);
}
Opcode fromWideOpcode(Opcode opcode) {
assert(isWideOpcode(opcode));
return Opcode.values[opcode.index - kWideModifier];
}
void verifyBytecodeInstructionDeclarations() {
const String kWideSuffix = '_Wide';
for (Opcode opcode in Opcode.values) {
final format = BytecodeFormats[opcode];
if (opcode.toString().endsWith(kWideSuffix)) {
if (format != null) {
throw 'Bytecode format should not be defined for wide opcode $opcode.';
}
final Opcode compact = Opcode.values[opcode.index - kWideModifier];
if (compact.toString() + kWideSuffix != opcode.toString()) {
throw 'Wide opcode $opcode should immediately follow its compact opcode (previous opcode is $compact).';
}
if (!hasWideVariant(compact)) {
throw 'Wide opcode $opcode should not be defined for opcode $compact with encoding ${BytecodeFormats[compact].encoding}.';
}
}
if (format == null) {
continue;
}
if (hasWideVariant(opcode)) {
if (Opcode.values[opcode.index + kWideModifier].toString() !=
opcode.toString() + kWideSuffix) {
throw 'Opcode $opcode$kWideSuffix should immedialy follow $opcode.';
}
if (opcode.index.isOdd) {
throw 'Opcode $opcode (${format.encoding}) has a wide variant and should be even';
}
}
}
if (Opcode.values.length > kMaxOpcodes) {
throw 'Too many opcodes';
}
}
bool isJump(Opcode opcode) => BytecodeFormats[opcode].encoding == Encoding.kT;
bool isThrow(Opcode opcode) => opcode == Opcode.kThrow;
bool isCall(Opcode opcode) {
switch (opcode) {
case Opcode.kDirectCall:
case Opcode.kUncheckedDirectCall:
case Opcode.kInterfaceCall:
case Opcode.kInstantiatedInterfaceCall:
case Opcode.kUncheckedClosureCall:
case Opcode.kUncheckedInterfaceCall:
case Opcode.kDynamicCall:
case Opcode.kNativeCall:
return true;
default:
return false;
}
}
bool isReturn(Opcode opcode) => opcode == Opcode.kReturnTOS;
bool isControlFlow(Opcode opcode) =>
isJump(opcode) || isThrow(opcode) || isCall(opcode) || isReturn(opcode);
bool isPush(Opcode opcode) {
switch (opcode) {
case Opcode.kPush:
case Opcode.kPushConstant:
case Opcode.kPushNull:
case Opcode.kPushTrue:
case Opcode.kPushFalse:
case Opcode.kPushInt:
return true;
default:
return false;
}
}
// Bytecode instructions reference constant pool indices using
// unsigned 32-bit operands.
const int constantPoolIndexLimit = 1 << 32;
// Local variables are referenced using 32-bit signed operands.
const int localVariableIndexLimit = 1 << 31;
// Captured variables are referenced using 32-bit unsigned operands.
const int capturedVariableIndexLimit = 1 << 32;
// Context IDs are referenced using 8-bit unsigned operands.
const int contextIdLimit = 1 << 8;
// Number of arguments is encoded as 8-bit unsigned operand.
const int argumentsLimit = 1 << 8;
// Base class for exceptions thrown when certain limit of bytecode
// format is exceeded.
abstract class BytecodeLimitExceededException {}
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