/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sw=4 et tw=0 ft=c: * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef vm_Opcodes_h #define vm_Opcodes_h #include "mozilla/Attributes.h" #include /* * JavaScript operation bytecodes. Add a new bytecode by claiming one of the * JSOP_UNUSED* here or by extracting the first unused opcode from * FOR_EACH_TRAILING_UNUSED_OPCODE and updating js::detail::LastDefinedOpcode * below. * * Includers must define a macro with the following form: * * #define MACRO(op,val,name,image,length,nuses,ndefs,format) ... * * Then simply use FOR_EACH_OPCODE(MACRO) to invoke MACRO for every opcode. * Selected arguments can be expanded in initializers. * * Field Description * op Bytecode name, which is the JSOp enumerator name * value Bytecode value, which is the JSOp enumerator value * name C string containing name for disassembler * image C string containing "image" for pretty-printer, null if ugly * length Number of bytes including any immediate operands * nuses Number of stack slots consumed by bytecode, -1 if variadic * ndefs Number of stack slots produced by bytecode, -1 if variadic * format Bytecode plus immediate operand encoding format * * This file is best viewed with 128 columns: 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678 */ /* * SpiderMonkey bytecode categorization (as used in generated documentation): * * [Index] * [Statements] * Jumps * Switch Statement * For-In Statement * With Statement * Exception Handling * Function * Generator * Debugger * [Variables and Scopes] * Variables * Free Variables * Local Variables * Aliased Variables * Intrinsics * Block-local Scope * This * Super * Arguments * Var Scope * [Operators] * Comparison Operators * Arithmetic Operators * Bitwise Logical Operators * Bitwise Shift Operators * Logical Operators * Special Operators * Stack Operations * Debugger * [Literals] * Constants * Object * Array * RegExp * Class * [Other] */ #define FOR_EACH_OPCODE(macro) \ /* legend: op val name image len use def format */ \ /* * No operation is performed. * Category: Other * Operands: * Stack: => */ \ macro(JSOP_NOP, 0, "nop", NULL, 1, 0, 0, JOF_BYTE) \ \ /* Long-standing JavaScript bytecodes. */ \ /* * Pushes 'undefined' onto the stack. * Category: Literals * Type: Constants * Operands: * Stack: => undefined */ \ macro(JSOP_UNDEFINED, 1, js_undefined_str, "", 1, 0, 1, JOF_BYTE) \ /* * Pushes stack frame's 'rval' onto the stack. * Category: Statements * Type: Function * Operands: * Stack: => rval */ \ macro(JSOP_GETRVAL, 2, "getrval", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pops the top of stack value, converts it to an object, and adds a * 'WithEnvironmentObject' wrapping that object to the scope chain. * * There is a matching JSOP_LEAVEWITH instruction later. All name * lookups between the two that may need to consult the With object * are deoptimized. * Category: Statements * Type: With Statement * Operands: uint32_t staticWithIndex * Stack: val => */ \ macro(JSOP_ENTERWITH, 3, "enterwith", NULL, 5, 1, 0, JOF_SCOPE) \ /* * Pops the scope chain object pushed by JSOP_ENTERWITH. * Category: Statements * Type: With Statement * Operands: * Stack: => */ \ macro(JSOP_LEAVEWITH, 4, "leavewith", NULL, 1, 0, 0, JOF_BYTE) \ /* * Pops the top of stack value as 'rval', stops interpretation of current * script and returns 'rval'. * Category: Statements * Type: Function * Operands: * Stack: rval => */ \ macro(JSOP_RETURN, 5, "return", NULL, 1, 1, 0, JOF_BYTE) \ /* * Jumps to a 32-bit offset from the current bytecode. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: => */ \ macro(JSOP_GOTO, 6, "goto", NULL, 5, 0, 0, JOF_JUMP) \ /* * Pops the top of stack value, converts it into a boolean, if the result is * 'false', jumps to a 32-bit offset from the current bytecode. * * The idea is that a sequence like * JSOP_ZERO; JSOP_ZERO; JSOP_EQ; JSOP_IFEQ; JSOP_RETURN; * reads like a nice linear sequence that will execute the return. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: cond => */ \ macro(JSOP_IFEQ, 7, "ifeq", NULL, 5, 1, 0, JOF_JUMP|JOF_DETECTING) \ /* * Pops the top of stack value, converts it into a boolean, if the result is * 'true', jumps to a 32-bit offset from the current bytecode. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: cond => */ \ macro(JSOP_IFNE, 8, "ifne", NULL, 5, 1, 0, JOF_JUMP) \ \ /* * Pushes the 'arguments' object for the current function activation. * * If 'JSScript' is not marked 'needsArgsObj', then a * JS_OPTIMIZED_ARGUMENTS magic value is pushed. Otherwise, a proper * arguments object is constructed and pushed. * * This opcode requires that the function does not have rest parameter. * Category: Variables and Scopes * Type: Arguments * Operands: * Stack: => arguments */ \ macro(JSOP_ARGUMENTS, 9, "arguments", NULL, 1, 0, 1, JOF_BYTE) \ \ /* * Swaps the top two values on the stack. This is useful for things like * post-increment/decrement. * Category: Operators * Type: Stack Operations * Operands: * Stack: v1, v2 => v2, v1 */ \ macro(JSOP_SWAP, 10, "swap", NULL, 1, 2, 2, JOF_BYTE) \ /* * Pops the top 'n' values from the stack. * Category: Operators * Type: Stack Operations * Operands: uint16_t n * Stack: v[n-1], ..., v[1], v[0] => * nuses: n */ \ macro(JSOP_POPN, 11, "popn", NULL, 3, -1, 0, JOF_UINT16) \ \ /* More long-standing bytecodes. */ \ /* * Pushes a copy of the top value on the stack. * Category: Operators * Type: Stack Operations * Operands: * Stack: v => v, v */ \ macro(JSOP_DUP, 12, "dup", NULL, 1, 1, 2, JOF_BYTE) \ /* * Duplicates the top two values on the stack. * Category: Operators * Type: Stack Operations * Operands: * Stack: v1, v2 => v1, v2, v1, v2 */ \ macro(JSOP_DUP2, 13, "dup2", NULL, 1, 2, 4, JOF_BYTE) \ \ /* * Checks that the top value on the stack is an object, and throws a * TypeError if not. The operand 'kind' is used only to generate an * appropriate error message. * Category: Statements * Type: Generator * Operands: uint8_t kind * Stack: result => result */ \ macro(JSOP_CHECKISOBJ,14, "checkisobj", NULL, 2, 1, 1, JOF_UINT8) \ \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * the result of the operation applied to the two operands, converting * both to 32-bit signed integers if necessary. * Category: Operators * Type: Bitwise Logical Operators * Operands: * Stack: lval, rval => (lval OP rval) */ \ macro(JSOP_BITOR, 15, "bitor", "|", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_BITXOR, 16, "bitxor", "^", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_BITAND, 17, "bitand", "&", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the top two values from the stack and pushes the result of * comparing them. * Category: Operators * Type: Comparison Operators * Operands: * Stack: lval, rval => (lval OP rval) */ \ macro(JSOP_EQ, 18, "eq", "==", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING) \ macro(JSOP_NE, 19, "ne", "!=", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING) \ macro(JSOP_LT, 20, "lt", "<", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_LE, 21, "le", "<=", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_GT, 22, "gt", ">", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_GE, 23, "ge", ">=", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * the result of the operation applied to the operands. * Category: Operators * Type: Bitwise Shift Operators * Operands: * Stack: lval, rval => (lval OP rval) */ \ macro(JSOP_LSH, 24, "lsh", "<<", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_RSH, 25, "rsh", ">>", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * 'lval >>> rval'. * Category: Operators * Type: Bitwise Shift Operators * Operands: * Stack: lval, rval => (lval >>> rval) */ \ macro(JSOP_URSH, 26, "ursh", ">>>", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * the result of 'lval + rval'. * Category: Operators * Type: Arithmetic Operators * Operands: * Stack: lval, rval => (lval + rval) */ \ macro(JSOP_ADD, 27, "add", "+", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * the result of applying the arithmetic operation to them. * Category: Operators * Type: Arithmetic Operators * Operands: * Stack: lval, rval => (lval OP rval) */ \ macro(JSOP_SUB, 28, "sub", "-", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_MUL, 29, "mul", "*", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_DIV, 30, "div", "/", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_MOD, 31, "mod", "%", 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \ /* * Pops the value 'val' from the stack, then pushes '!val'. * Category: Operators * Type: Logical Operators * Operands: * Stack: val => (!val) */ \ macro(JSOP_NOT, 32, "not", "!", 1, 1, 1, JOF_BYTE|JOF_ARITH|JOF_DETECTING) \ /* * Pops the value 'val' from the stack, then pushes '~val'. * Category: Operators * Type: Bitwise Logical Operators * Operands: * Stack: val => (~val) */ \ macro(JSOP_BITNOT, 33, "bitnot", "~", 1, 1, 1, JOF_BYTE|JOF_ARITH) \ /* * Pops the value 'val' from the stack, then pushes '-val'. * Category: Operators * Type: Arithmetic Operators * Operands: * Stack: val => (-val) */ \ macro(JSOP_NEG, 34, "neg", "- ", 1, 1, 1, JOF_BYTE|JOF_ARITH) \ /* * Pops the value 'val' from the stack, then pushes '+val'. * ('+val' is the value converted to a number.) * Category: Operators * Type: Arithmetic Operators * Operands: * Stack: val => (+val) */ \ macro(JSOP_POS, 35, "pos", "+ ", 1, 1, 1, JOF_BYTE|JOF_ARITH) \ /* * Looks up name on the scope chain and deletes it, pushes 'true' onto the * stack if succeeded (if the property was present and deleted or if the * property wasn't present in the first place), 'false' if not. * * Strict mode code should never contain this opcode. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => succeeded */ \ macro(JSOP_DELNAME, 36, "delname", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_CHECKSLOPPY) \ /* * Pops the top of stack value, deletes property from it, pushes 'true' onto * the stack if succeeded, 'false' if not. * Category: Operators * Type: Special Operators * Operands: uint32_t nameIndex * Stack: obj => succeeded */ \ macro(JSOP_DELPROP, 37, "delprop", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_CHECKSLOPPY) \ /* * Pops the top two values on the stack as 'propval' and 'obj', * deletes 'propval' property from 'obj', pushes 'true' onto the stack if * succeeded, 'false' if not. * Category: Operators * Type: Special Operators * Operands: * Stack: obj, propval => succeeded */ \ macro(JSOP_DELELEM, 38, "delelem", NULL, 1, 2, 1, JOF_BYTE |JOF_ELEM|JOF_CHECKSLOPPY) \ /* * Pops the value 'val' from the stack, then pushes 'typeof val'. * Category: Operators * Type: Special Operators * Operands: * Stack: val => (typeof val) */ \ macro(JSOP_TYPEOF, 39, js_typeof_str,NULL, 1, 1, 1, JOF_BYTE|JOF_DETECTING) \ /* * Pops the top value on the stack and pushes 'undefined'. * Category: Operators * Type: Special Operators * Operands: * Stack: val => undefined */ \ macro(JSOP_VOID, 40, js_void_str, NULL, 1, 1, 1, JOF_BYTE) \ \ /* * spreadcall variant of JSOP_CALL. * * Invokes 'callee' with 'this' and 'args', pushes the return value onto * the stack. * * 'args' is an Array object which contains actual arguments. * Category: Statements * Type: Function * Operands: * Stack: callee, this, args => rval */ \ macro(JSOP_SPREADCALL,41, "spreadcall", NULL, 1, 3, 1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \ /* * spreadcall variant of JSOP_NEW * * Invokes 'callee' as a constructor with 'this' and 'args', pushes the * return value onto the stack. * Category: Statements * Type: Function * Operands: * Stack: callee, this, args, newTarget => rval */ \ macro(JSOP_SPREADNEW, 42, "spreadnew", NULL, 1, 4, 1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \ /* * spreadcall variant of JSOP_EVAL * * Invokes 'eval' with 'args' and pushes the return value onto the stack. * * If 'eval' in global scope is not original one, invokes the function * with 'this' and 'args', and pushes return value onto the stack. * Category: Statements * Type: Function * Operands: * Stack: callee, this, args => rval */ \ macro(JSOP_SPREADEVAL,43, "spreadeval", NULL, 1, 3, 1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET|JOF_CHECKSLOPPY) \ \ /* * Duplicates the Nth value from the top onto the stack. * Category: Operators * Type: Stack Operations * Operands: uint24_t n * Stack: v[n], v[n-1], ..., v[1], v[0] => * v[n], v[n-1], ..., v[1], v[0], v[n] */ \ macro(JSOP_DUPAT, 44, "dupat", NULL, 4, 0, 1, JOF_UINT24) \ \ /* * Push a well-known symbol onto the operand stack. * Category: Literals * Type: Constants * Operands: uint8_t n, the JS::SymbolCode of the symbol to use * Stack: => symbol */ \ macro(JSOP_SYMBOL, 45, "symbol", NULL, 2, 0, 1, JOF_UINT8) \ \ /* * Pops the top of stack value and attempts to delete the given property * from it. Pushes 'true' onto success, else throws a TypeError per strict * mode property-deletion requirements. * Category: Operators * Type: Special Operators * Operands: uint32_t nameIndex * Stack: obj => succeeded */ \ macro(JSOP_STRICTDELPROP, 46, "strict-delprop", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_CHECKSTRICT) \ /* * Pops the top two values on the stack as 'propval' and 'obj', * and attempts to delete 'propval' property from 'obj'. Pushes 'true' onto * the stack on success, else throws a TypeError per strict mode property * deletion requirements. * Category: Literals * Type: Object * Operands: * Stack: obj, propval => succeeded */ \ macro(JSOP_STRICTDELELEM, 47, "strict-delelem", NULL, 1, 2, 1, JOF_BYTE|JOF_ELEM|JOF_CHECKSTRICT) \ /* * Pops the top two values on the stack as 'val' and 'obj', and performs * 'obj.prop = val', pushing 'val' back onto the stack. Throws a TypeError * if the set-operation failed (per strict mode semantics). * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => val */ \ macro(JSOP_STRICTSETPROP, 48, "strict-setprop", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_CHECKSTRICT) \ /* * Pops a scope and value from the stack, assigns value to the given name, * and pushes the value back on the stack. If the set failed, then throw * a TypeError, per usual strict mode semantics. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: scope, val => val */ \ macro(JSOP_STRICTSETNAME, 49, "strict-setname", NULL, 5, 2, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_CHECKSTRICT) \ /* * spreadcall variant of JSOP_EVAL * * Invokes 'eval' with 'args' and pushes the return value onto the stack. * * If 'eval' in global scope is not original one, invokes the function * with 'this' and 'args', and pushes return value onto the stack. * Category: Statements * Type: Function * Operands: * Stack: callee, this, args => rval */ \ macro(JSOP_STRICTSPREADEVAL, 50, "strict-spreadeval", NULL, 1, 3, 1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET|JOF_CHECKSTRICT) \ /* * Writes the [[Prototype]] objects for both a class and its .prototype to * the stack, given the result of a heritage expression. * Category: Literals * Type: Object * Operands: * Stack: heritage => funcProto, objProto */ \ macro(JSOP_CLASSHERITAGE, 51, "classheritage", NULL, 1, 1, 2, JOF_BYTE) \ /* * Pushes a clone of a function with a given [[Prototype]] onto the stack. * Category: Statements * Type: Function * Operands: uint32_t funcIndex * Stack: proto => obj */ \ macro(JSOP_FUNWITHPROTO, 52, "funwithproto", NULL, 5, 1, 1, JOF_OBJECT) \ \ /* * Pops the top of stack value, pushes property of it onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj => obj[name] */ \ macro(JSOP_GETPROP, 53, "getprop", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_TYPESET) \ /* * Pops the top two values on the stack as 'val' and 'obj' and performs * 'obj.prop = val', pushing 'val' back onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => val */ \ macro(JSOP_SETPROP, 54, "setprop", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_CHECKSLOPPY) \ /* * Pops the top two values on the stack as 'propval' and 'obj', pushes * 'propval' property of 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, propval => obj[propval] */ \ macro(JSOP_GETELEM, 55, "getelem", NULL, 1, 2, 1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC) \ /* * Pops the top three values on the stack as 'val', 'propval' and 'obj', * sets 'propval' property of 'obj' as 'val', pushes 'obj' onto the * stack. * Category: Literals * Type: Object * Operands: * Stack: obj, propval, val => val */ \ macro(JSOP_SETELEM, 56, "setelem", NULL, 1, 3, 1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING|JOF_CHECKSLOPPY) \ /* * Pops the top three values on the stack as 'val', 'propval' and 'obj', * sets 'propval' property of 'obj' as 'val', pushes 'obj' onto the * stack. Throws a TypeError if the set fails, per strict mode * semantics. * Category: Literals * Type: Object * Operands: * Stack: obj, propval, val => val */ \ macro(JSOP_STRICTSETELEM, 57, "strict-setelem", NULL, 1, 3, 1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING|JOF_CHECKSTRICT) \ /* * Invokes 'callee' with 'this' and 'args', pushes return value onto the * stack. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_CALL, 58, "call", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ /* * Looks up name on the scope chain and pushes its value onto the stack. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => val */ \ macro(JSOP_GETNAME, 59, "getname", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \ /* * Pushes numeric constant onto the stack. * Category: Literals * Type: Constants * Operands: uint32_t constIndex * Stack: => val */ \ macro(JSOP_DOUBLE, 60, "double", NULL, 5, 0, 1, JOF_DOUBLE) \ /* * Pushes string constant onto the stack. * Category: Literals * Type: Constants * Operands: uint32_t atomIndex * Stack: => string */ \ macro(JSOP_STRING, 61, "string", NULL, 5, 0, 1, JOF_ATOM) \ /* * Pushes '0' onto the stack. * Category: Literals * Type: Constants * Operands: * Stack: => 0 */ \ macro(JSOP_ZERO, 62, "zero", "0", 1, 0, 1, JOF_BYTE) \ /* * Pushes '1' onto the stack. * Category: Literals * Type: Constants * Operands: * Stack: => 1 */ \ macro(JSOP_ONE, 63, "one", "1", 1, 0, 1, JOF_BYTE) \ /* * Pushes 'null' onto the stack. * Category: Literals * Type: Constants * Operands: * Stack: => null */ \ macro(JSOP_NULL, 64, js_null_str, js_null_str, 1, 0, 1, JOF_BYTE) \ /* * Pushes 'JS_IS_CONSTRUCTING' * Category: Literals * Type: Constants * Operands: * Stack: => JS_IS_CONSTRUCTING */ \ macro(JSOP_IS_CONSTRUCTING, 65, "is-constructing", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pushes boolean value onto the stack. * Category: Literals * Type: Constants * Operands: * Stack: => true/false */ \ macro(JSOP_FALSE, 66, js_false_str, js_false_str, 1, 0, 1, JOF_BYTE) \ macro(JSOP_TRUE, 67, js_true_str, js_true_str, 1, 0, 1, JOF_BYTE) \ /* * Converts the top of stack value into a boolean, if the result is 'true', * jumps to a 32-bit offset from the current bytecode. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: cond => cond */ \ macro(JSOP_OR, 68, "or", NULL, 5, 1, 1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC) \ /* * Converts the top of stack value into a boolean, if the result is 'false', * jumps to a 32-bit offset from the current bytecode. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: cond => cond */ \ macro(JSOP_AND, 69, "and", NULL, 5, 1, 1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC) \ \ /* * Pops the top of stack value as 'i', if 'low <= i <= high', * jumps to a 32-bit offset: 'offset[i - low]' from the current bytecode, * jumps to a 32-bit offset: 'len' from the current bytecode if not. * * This opcode has variable length. * Category: Statements * Type: Switch Statement * Operands: int32_t len, int32_t low, int32_t high, * int32_t offset[0], ..., int32_t offset[high-low] * Stack: i => * len: len */ \ macro(JSOP_TABLESWITCH, 70, "tableswitch", NULL, -1, 1, 0, JOF_TABLESWITCH|JOF_DETECTING) \ \ /* * Prologue emitted in scripts expected to run once, which deoptimizes code * if it executes multiple times. * Category: Statements * Type: Function * Operands: * Stack: => */ \ macro(JSOP_RUNONCE, 71, "runonce", NULL, 1, 0, 0, JOF_BYTE) \ \ /* New, infallible/transitive identity ops. */ \ /* * Pops the top two values from the stack, then pushes the result of * applying the operator to the two values. * Category: Operators * Type: Comparison Operators * Operands: * Stack: lval, rval => (lval OP rval) */ \ macro(JSOP_STRICTEQ, 72, "stricteq", "===", 1, 2, 1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH) \ macro(JSOP_STRICTNE, 73, "strictne", "!==", 1, 2, 1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH) \ \ /* * Sometimes we know when emitting that an operation will always throw. * * Throws the indicated JSMSG. * * Category: Statements * Type: Exception Handling * Operands: uint16_t msgNumber * Stack: => */ \ macro(JSOP_THROWMSG, 74, "throwmsg", NULL, 3, 0, 0, JOF_UINT16) \ \ /* * Sets up a for-in or for-each-in loop using the JSITER_* flag bits in * this op's uint8_t immediate operand. It pops the top of stack value as * 'val' and pushes 'iter' which is an iterator for 'val'. * Category: Statements * Type: For-In Statement * Operands: uint8_t flags * Stack: val => iter */ \ macro(JSOP_ITER, 75, "iter", NULL, 2, 1, 1, JOF_UINT8) \ /* * Pushes the next iterated value onto the stack. If no value is available, * MagicValue(JS_NO_ITER_VALUE) is pushed. * * Category: Statements * Type: For-In Statement * Operands: * Stack: iter => iter, val */ \ macro(JSOP_MOREITER, 76, "moreiter", NULL, 1, 1, 2, JOF_BYTE) \ /* * Pushes a boolean indicating whether the value on top of the stack is * MagicValue(JS_NO_ITER_VALUE). * * Category: Statements * Type: For-In Statement * Operands: * Stack: val => val, res */ \ macro(JSOP_ISNOITER, 77, "isnoiter", NULL, 1, 1, 2, JOF_BYTE) \ /* * Exits a for-in loop by popping the iterator object from the stack and * closing it. * Category: Statements * Type: For-In Statement * Operands: * Stack: iter => */ \ macro(JSOP_ENDITER, 78, "enditer", NULL, 1, 1, 0, JOF_BYTE) \ \ /* * Invokes 'callee' with 'this' and 'args', pushes return value onto the * stack. * * This is for 'f.apply'. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_FUNAPPLY, 79, "funapply", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ \ /* * Pushes deep-cloned object literal or singleton onto the stack. * Category: Literals * Type: Object * Operands: uint32_t objectIndex * Stack: => obj */ \ macro(JSOP_OBJECT, 80, "object", NULL, 5, 0, 1, JOF_OBJECT) \ \ /* * Pops the top value off the stack. * Category: Operators * Type: Stack Operations * Operands: * Stack: v => */ \ macro(JSOP_POP, 81, "pop", NULL, 1, 1, 0, JOF_BYTE) \ \ /* * Invokes 'callee' as a constructor with 'this' and 'args', pushes return * value onto the stack. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1], newTarget => rval * nuses: (argc+3) */ \ macro(JSOP_NEW, 82, "new", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ /* * Pushes newly created object onto the stack with provided [[Prototype]]. * * Category: Literals * Type: Object * Operands: * Stack: proto => obj */ \ macro(JSOP_OBJWITHPROTO, 83, "objwithproto", NULL, 1, 1, 1, JOF_BYTE) \ \ /* * Fast get op for function arguments and local variables. * * Pushes 'arguments[argno]' onto the stack. * Category: Variables and Scopes * Type: Arguments * Operands: uint16_t argno * Stack: => arguments[argno] */ \ macro(JSOP_GETARG, 84, "getarg", NULL, 3, 0, 1, JOF_QARG |JOF_NAME) \ /* * Fast set op for function arguments and local variables. * * Sets 'arguments[argno]' as the top of stack value. * Category: Variables and Scopes * Type: Arguments * Operands: uint16_t argno * Stack: v => v */ \ macro(JSOP_SETARG, 85, "setarg", NULL, 3, 1, 1, JOF_QARG |JOF_NAME|JOF_SET) \ /* * Pushes the value of local variable onto the stack. * Category: Variables and Scopes * Type: Local Variables * Operands: uint32_t localno * Stack: => val */ \ macro(JSOP_GETLOCAL, 86,"getlocal", NULL, 4, 0, 1, JOF_LOCAL|JOF_NAME) \ /* * Stores the top stack value to the given local. * Category: Variables and Scopes * Type: Local Variables * Operands: uint32_t localno * Stack: v => v */ \ macro(JSOP_SETLOCAL, 87,"setlocal", NULL, 4, 1, 1, JOF_LOCAL|JOF_NAME|JOF_SET|JOF_DETECTING) \ \ /* * Pushes unsigned 16-bit int immediate integer operand onto the stack. * Category: Literals * Type: Constants * Operands: uint16_t val * Stack: => val */ \ macro(JSOP_UINT16, 88, "uint16", NULL, 3, 0, 1, JOF_UINT16) \ \ /* Object and array literal support. */ \ /* * Pushes newly created object onto the stack. * * This opcode takes the kind of initializer (JSProto_Array or * JSProto_Object). * * This opcode has three extra bytes so it can be exchanged with * JSOP_NEWOBJECT during emit. * Category: Literals * Type: Object * Operands: uint8_t kind (, uint24_t extra) * Stack: => obj */ \ macro(JSOP_NEWINIT, 89, "newinit", NULL, 5, 0, 1, JOF_UINT8) \ /* * Pushes newly created array onto the stack. * * This opcode takes the final length, which is preallocated. * Category: Literals * Type: Array * Operands: uint32_t length * Stack: => obj */ \ macro(JSOP_NEWARRAY, 90, "newarray", NULL, 5, 0, 1, JOF_UINT32) \ /* * Pushes newly created object onto the stack. * * This opcode takes an object with the final shape, which can be set at * the start and slots then filled in directly. * Category: Literals * Type: Object * Operands: uint32_t baseobjIndex * Stack: => obj */ \ macro(JSOP_NEWOBJECT, 91, "newobject", NULL, 5, 0, 1, JOF_OBJECT) \ \ /* * Initialize the home object for functions with super bindings. * * This opcode takes the function and the object to be the home object, does * the set, and leaves both on the stack. * Category: Literals * Type: Object * Operands: uint8_t n * Stack: homeObject, [...n], fun => homeObject, [...n], fun */\ macro(JSOP_INITHOMEOBJECT, 92, "inithomeobject", NULL, 2, 2, 2, JOF_UINT8) \ \ /* * Initialize a named property in an object literal, like '{a: x}'. * * Pops the top two values on the stack as 'val' and 'obj', defines * 'nameIndex' property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITPROP, 93, "initprop", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ \ /* * Initialize a numeric property in an object literal, like '{1: x}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITELEM, 94, "initelem", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ \ /* * Pops the top three values on the stack as 'val', 'index' and 'obj', sets * 'index' property of 'obj' as 'val', pushes 'obj' and 'index + 1' onto * the stack. * * This opcode is used in Array literals with spread and spreadcall * arguments. * Category: Literals * Type: Array * Operands: * Stack: obj, index, val => obj, (index + 1) */ \ macro(JSOP_INITELEM_INC,95, "initelem_inc", NULL, 1, 3, 2, JOF_BYTE|JOF_ELEM|JOF_SET) \ \ /* * Initialize an array element. * * Pops the top two values on the stack as 'val' and 'obj', sets 'index' * property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Array * Operands: uint32_t index * Stack: obj, val => obj */ \ macro(JSOP_INITELEM_ARRAY,96, "initelem_array", NULL, 5, 2, 1, JOF_UINT32|JOF_ELEM|JOF_SET|JOF_DETECTING) \ \ /* * Initialize a getter in an object literal. * * Pops the top two values on the stack as 'val' and 'obj', defines getter * of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITPROP_GETTER, 97, "initprop_getter", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Initialize a setter in an object literal. * * Pops the top two values on the stack as 'val' and 'obj', defines setter * of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITPROP_SETTER, 98, "initprop_setter", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Initialize a numeric getter in an object literal like * '{get 2() {}}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' getter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITELEM_GETTER, 99, "initelem_getter", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ /* * Initialize a numeric setter in an object literal like * '{set 2(v) {}}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' setter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITELEM_SETTER, 100, "initelem_setter", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ /* * Pushes the call site object specified by objectIndex onto the stack. Defines the raw * property specified by objectIndex + 1 on the call site object and freezes both the call site * object as well as its raw property. * Category: Literals * Type: Object * Operands: uint32_t objectIndex * Stack: => obj */ \ macro(JSOP_CALLSITEOBJ, 101, "callsiteobj", NULL, 5, 0, 1, JOF_OBJECT) \ \ /* * Pushes a newly created array onto the stack, whose elements are the same * as that of a template object's copy on write elements. * * Category: Literals * Type: Array * Operands: uint32_t objectIndex * Stack: => obj */ \ macro(JSOP_NEWARRAY_COPYONWRITE, 102, "newarray_copyonwrite", NULL, 5, 0, 1, JOF_OBJECT) \ \ /* * Pushes the prototype of the home object for current callee onto the * stack. * Category: Variables and Scopes * Type: Super * Operands: * Stack: => homeObjectProto */\ macro(JSOP_SUPERBASE, 103, "superbase", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pops the top two values, and pushes the property of one, using the other * as the receiver. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: receiver obj => obj[name] */ \ macro(JSOP_GETPROP_SUPER, 104, "getprop-super", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP) \ /* * Pops the top three values on the stack as 'val' and 'obj', and 'receiver', * and performs 'obj.prop = val', pushing 'val' back onto the stack. * Throws a TypeError if the set-operation failed (per strict mode semantics). * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: receiver, obj, val => val */ \ macro(JSOP_STRICTSETPROP_SUPER, 105, "strictsetprop-super", NULL, 5, 3, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_CHECKSTRICT) \ \ /* * This opcode precedes every labeled statement. It's a no-op. * * 'offset' is the offset to the next instruction after this statement, * the one 'break LABEL;' would jump to. IonMonkey uses this. * Category: Statements * Type: Jumps * Operands: int32_t offset * Stack: => */ \ macro(JSOP_LABEL, 106,"label", NULL, 5, 0, 0, JOF_JUMP) \ \ /* * Pops the top three values on the stack as 'val', 'obj' and 'receiver', * and performs 'obj.prop = val', pushing 'val' back onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: receiver, obj, val => val */ \ macro(JSOP_SETPROP_SUPER, 107, "setprop-super", NULL, 5, 3, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_CHECKSLOPPY) \ \ /* * Invokes 'callee' with 'this' and 'args', pushes return value onto the * stack. * * If 'callee' is determined to be the canonical 'Function.prototype.call' * function, then this operation is optimized to directly call 'callee' * with 'args[0]' as 'this', and the remaining arguments as formal args * to 'callee'. * * Like JSOP_FUNAPPLY but for 'f.call' instead of 'f.apply'. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_FUNCALL, 108,"funcall", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ \ /* * Another no-op. * * This opcode is the target of the backwards jump for some loop. * Category: Statements * Type: Jumps * Operands: * Stack: => */ \ macro(JSOP_LOOPHEAD, 109,"loophead", NULL, 1, 0, 0, JOF_BYTE) \ \ /* ECMA-compliant assignment ops. */ \ /* * Looks up name on the scope chain and pushes the scope which contains * the name onto the stack. If not found, pushes global scope onto the * stack. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => scope */ \ macro(JSOP_BINDNAME, 110,"bindname", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_SET) \ /* * Pops a scope and value from the stack, assigns value to the given name, * and pushes the value back on the stack * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: scope, val => val */ \ macro(JSOP_SETNAME, 111,"setname", NULL, 5, 2, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_CHECKSLOPPY) \ \ /* Exception handling ops. */ \ /* * Pops the top of stack value as 'v', sets pending exception as 'v', then * raises error. * Category: Statements * Type: Exception Handling * Operands: * Stack: v => */ \ macro(JSOP_THROW, 112,js_throw_str, NULL, 1, 1, 0, JOF_BYTE) \ \ /* * Pops the top two values 'id' and 'obj' from the stack, then pushes * 'id in obj'. This will throw a 'TypeError' if 'obj' is not an object. * * Note that 'obj' is the top value. * Category: Operators * Type: Special Operators * Operands: * Stack: id, obj => (id in obj) */ \ macro(JSOP_IN, 113,js_in_str, js_in_str, 1, 2, 1, JOF_BYTE|JOF_LEFTASSOC) \ /* * Pops the top two values 'obj' and 'ctor' from the stack, then pushes * 'obj instanceof ctor'. This will throw a 'TypeError' if 'obj' is not an * object. * Category: Operators * Type: Special Operators * Operands: * Stack: obj, ctor => (obj instanceof ctor) */ \ macro(JSOP_INSTANCEOF,114,js_instanceof_str,js_instanceof_str,1,2,1,JOF_BYTE|JOF_LEFTASSOC) \ \ /* * Invokes debugger. * Category: Statements * Type: Debugger * Operands: * Stack: => */ \ macro(JSOP_DEBUGGER, 115,"debugger", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Pushes 'false' and next bytecode's PC onto the stack, and jumps to * a 32-bit offset from the current bytecode. * * This opcode is used for entering 'finally' block. * Category: Statements * Type: Exception Handling * Operands: int32_t offset * Stack: => false, (next bytecode's PC) */ \ macro(JSOP_GOSUB, 116,"gosub", NULL, 5, 0, 0, JOF_JUMP) \ /* * Pops the top two values on the stack as 'rval' and 'lval', converts * 'lval' into a boolean, raises error if the result is 'true', * jumps to a 32-bit absolute PC: 'rval' if 'false'. * * This opcode is used for returning from 'finally' block. * Category: Statements * Type: Exception Handling * Operands: * Stack: lval, rval => */ \ macro(JSOP_RETSUB, 117,"retsub", NULL, 1, 2, 0, JOF_BYTE) \ \ /* More exception handling ops. */ \ /* * Pushes the current pending exception onto the stack and clears the * pending exception. This is only emitted at the beginning of code for a * catch-block, so it is known that an exception is pending. It is used to * implement catch-blocks and 'yield*'. * Category: Statements * Type: Exception Handling * Operands: * Stack: => exception */ \ macro(JSOP_EXCEPTION, 118,"exception", NULL, 1, 0, 1, JOF_BYTE) \ \ /* * Embedded lineno to speedup 'pc->line' mapping. * Category: Other * Operands: uint32_t lineno * Stack: => */ \ macro(JSOP_LINENO, 119,"lineno", NULL, 5, 0, 0, JOF_UINT32) \ \ /* * This no-op appears after the bytecode for EXPR in 'switch (EXPR) {...}' * if the switch cannot be optimized using JSOP_TABLESWITCH. * For a non-optimized switch statement like this: * * switch (EXPR) { * case V0: * C0; * ... * default: * D; * } * * the bytecode looks like this: * * (EXPR) * condswitch * (V0) * case ->C0 * ... * default ->D * (C0) * ... * (D) * * Note that code for all case-labels is emitted first, then code for * the body of each case clause. * Category: Statements * Type: Switch Statement * Operands: * Stack: => */ \ macro(JSOP_CONDSWITCH,120,"condswitch", NULL, 1, 0, 0, JOF_BYTE) \ /* * Pops the top two values on the stack as 'rval' and 'lval', compare them * with '===', if the result is 'true', jumps to a 32-bit offset from the * current bytecode, re-pushes 'lval' onto the stack if 'false'. * Category: Statements * Type: Switch Statement * Operands: int32_t offset * Stack: lval, rval => lval(if lval !== rval) */ \ macro(JSOP_CASE, 121,"case", NULL, 5, 2, 1, JOF_JUMP) \ /* * This appears after all cases in a JSOP_CONDSWITCH, whether there is a * 'default:' label in the switch statement or not. Pop the switch operand * from the stack and jump to a 32-bit offset from the current bytecode. * offset from the current bytecode. * Category: Statements * Type: Switch Statement * Operands: int32_t offset * Stack: lval => */ \ macro(JSOP_DEFAULT, 122,"default", NULL, 5, 1, 0, JOF_JUMP) \ \ /* ECMA-compliant call to eval op. */ \ /* * Invokes 'eval' with 'args' and pushes return value onto the stack. * * If 'eval' in global scope is not original one, invokes the function * with 'this' and 'args', and pushes return value onto the stack. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_EVAL, 123,"eval", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET|JOF_CHECKSLOPPY) \ \ /* ECMA-compliant call to eval op. */ \ /* * Invokes 'eval' with 'args' and pushes return value onto the stack. * * If 'eval' in global scope is not original one, invokes the function * with 'this' and 'args', and pushes return value onto the stack. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_STRICTEVAL, 124, "strict-eval", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET|JOF_CHECKSTRICT) \ /* * LIKE JSOP_GETELEM but takes receiver on stack, and the propval is * evaluated before the obj. * Category: Literals * Type: Object * Operands: * Stack: receiver, obj, propval => obj[propval] */ \ macro(JSOP_GETELEM_SUPER, 125, "getelem-super", NULL, 1, 3, 1, JOF_BYTE |JOF_ELEM|JOF_LEFTASSOC) \ macro(JSOP_UNUSED126, 126, "unused126", NULL, 5, 0, 1, JOF_UINT32) \ \ /* * Defines the given function on the current scope. * * This is used for global scripts and also in some cases for function * scripts where use of dynamic scoping inhibits optimization. * Category: Variables and Scopes * Type: Variables * Operands: * Stack: fun => */ \ macro(JSOP_DEFFUN, 127,"deffun", NULL, 1, 1, 0, JOF_BYTE) \ /* Defines the new constant binding on global lexical scope. * * Throws if a binding with the same name already exists on the scope, or * if a var binding with the same name exists on the global. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => */ \ macro(JSOP_DEFCONST, 128,"defconst", NULL, 5, 0, 0, JOF_ATOM) \ /* * Defines the new binding on the frame's current variables-object (the * scope object on the scope chain designated to receive new variables). * * Throws if the current variables-object is the global object and a * binding with the same name exists on the global lexical scope. * * This is used for global scripts and also in some cases for function * scripts where use of dynamic scoping inhibits optimization. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => */ \ macro(JSOP_DEFVAR, 129,"defvar", NULL, 5, 0, 0, JOF_ATOM) \ \ /* * Pushes a closure for a named or anonymous function expression onto the * stack. * Category: Statements * Type: Function * Operands: uint32_t funcIndex * Stack: => obj */ \ macro(JSOP_LAMBDA, 130, "lambda", NULL, 5, 0, 1, JOF_OBJECT) \ /* * Pops the top of stack value as 'new.target', pushes an arrow function with * lexical 'new.target' onto the stack. * Category: Statements * Type: Function * Operands: uint32_t funcIndex * Stack: new.target => obj */ \ macro(JSOP_LAMBDA_ARROW, 131, "lambda_arrow", NULL, 5, 1, 1, JOF_OBJECT) \ \ /* * Pushes current callee onto the stack. * * Used for named function expression self-naming, if lightweight. * Category: Variables and Scopes * Type: Arguments * Operands: * Stack: => callee */ \ macro(JSOP_CALLEE, 132, "callee", NULL, 1, 0, 1, JOF_BYTE) \ \ /* * Picks the nth element from the stack and moves it to the top of the * stack. * Category: Operators * Type: Stack Operations * Operands: uint8_t n * Stack: v[n], v[n-1], ..., v[1], v[0] => v[n-1], ..., v[1], v[0], v[n] */ \ macro(JSOP_PICK, 133, "pick", NULL, 2, 0, 0, JOF_UINT8) \ \ /* * This no-op appears at the top of the bytecode for a 'TryStatement'. * * Location information for catch/finally blocks is stored in a * side table, 'script->trynotes()'. * Category: Statements * Type: Exception Handling * Operands: * Stack: => */ \ macro(JSOP_TRY, 134,"try", NULL, 1, 0, 0, JOF_BYTE) \ /* * This opcode has a def count of 2, but these values are already on the * stack (they're pushed by JSOP_GOSUB). * Category: Statements * Type: Exception Handling * Operands: * Stack: => false, (next bytecode's PC) */ \ macro(JSOP_FINALLY, 135,"finally", NULL, 1, 0, 2, JOF_BYTE) \ \ /* * Pushes aliased variable onto the stack. * * An "aliased variable" is a var, let, or formal arg that is aliased. * Sources of aliasing include: nested functions accessing the vars of an * enclosing function, function statements that are conditionally executed, * 'eval', 'with', and 'arguments'. All of these cases require creating a * CallObject to own the aliased variable. * * An ALIASEDVAR opcode contains the following immediates: * uint8 hops: the number of scope objects to skip to find the ScopeObject * containing the variable being accessed * uint24 slot: the slot containing the variable in the ScopeObject (this * 'slot' does not include RESERVED_SLOTS). * Category: Variables and Scopes * Type: Aliased Variables * Operands: uint8_t hops, uint24_t slot * Stack: => aliasedVar */ \ macro(JSOP_GETALIASEDVAR, 136,"getaliasedvar",NULL, 5, 0, 1, JOF_ENVCOORD|JOF_NAME|JOF_TYPESET) \ /* * Sets aliased variable as the top of stack value. * Category: Variables and Scopes * Type: Aliased Variables * Operands: uint8_t hops, uint24_t slot * Stack: v => v */ \ macro(JSOP_SETALIASEDVAR, 137,"setaliasedvar",NULL, 5, 1, 1, JOF_ENVCOORD|JOF_NAME|JOF_SET|JOF_DETECTING) \ \ /* * Checks if the value of the local variable is the * JS_UNINITIALIZED_LEXICAL magic, throwing an error if so. * Category: Variables and Scopes * Type: Local Variables * Operands: uint32_t localno * Stack: => */ \ macro(JSOP_CHECKLEXICAL, 138, "checklexical", NULL, 4, 0, 0, JOF_LOCAL|JOF_NAME) \ /* * Initializes an uninitialized local lexical binding with the top of stack * value. * Category: Variables and Scopes * Type: Local Variables * Operands: uint32_t localno * Stack: v => v */ \ macro(JSOP_INITLEXICAL, 139, "initlexical", NULL, 4, 1, 1, JOF_LOCAL|JOF_NAME|JOF_SET|JOF_DETECTING) \ /* * Checks if the value of the aliased variable is the * JS_UNINITIALIZED_LEXICAL magic, throwing an error if so. * Category: Variables and Scopes * Type: Aliased Variables * Operands: uint8_t hops, uint24_t slot * Stack: => */ \ macro(JSOP_CHECKALIASEDLEXICAL, 140, "checkaliasedlexical", NULL, 5, 0, 0, JOF_ENVCOORD|JOF_NAME) \ /* * Initializes an uninitialized aliased lexical binding with the top of * stack value. * Category: Variables and Scopes * Type: Aliased Variables * Operands: uint8_t hops, uint24_t slot * Stack: v => v */ \ macro(JSOP_INITALIASEDLEXICAL, 141, "initaliasedlexical", NULL, 5, 1, 1, JOF_ENVCOORD|JOF_NAME|JOF_SET|JOF_DETECTING) \ /* * Pushes a JS_UNINITIALIZED_LEXICAL value onto the stack, representing an * uninitialized lexical binding. * * This opcode is used with the JSOP_INITLET opcode. * Category: Literals * Type: Constants * Operands: * Stack: => uninitialized */ \ macro(JSOP_UNINITIALIZED, 142, "uninitialized", NULL, 1, 0, 1, JOF_BYTE) \ /* Pushes the value of the intrinsic onto the stack. * * Intrinsic names are emitted instead of JSOP_*NAME ops when the * 'CompileOptions' flag 'selfHostingMode' is set. * * They are used in self-hosted code to access other self-hosted values and * intrinsic functions the runtime doesn't give client JS code access to. * Category: Variables and Scopes * Type: Intrinsics * Operands: uint32_t nameIndex * Stack: => intrinsic[name] */ \ macro(JSOP_GETINTRINSIC, 143, "getintrinsic", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \ /* * Stores the top stack value in the specified intrinsic. * Category: Variables and Scopes * Type: Intrinsics * Operands: uint32_t nameIndex * Stack: val => val */ \ macro(JSOP_SETINTRINSIC, 144, "setintrinsic", NULL, 5, 1, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING) \ /* * Like JSOP_CALL, but used as part of for-of and destructuring bytecode * to provide better error messages. * Category: Statements * Type: Function * Operands: uint16_t argc (must be 0) * Stack: callee, this => rval * nuses: 2 */ \ macro(JSOP_CALLITER, 145, "calliter", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ /* * Initialize a non-configurable, non-writable, non-enumerable data-property on an object. * * Pops the top two values on the stack as 'val' and 'obj', defines * 'nameIndex' property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITLOCKEDPROP, 146, "initlockedprop", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable data-property on an object. * * Pops the top two values on the stack as 'val' and 'obj', defines * 'nameIndex' property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITHIDDENPROP, 147,"inithiddenprop", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Push "new.target" * * Category: Variables and Scopes * Type: Arguments * Operands: * Stack: => new.target */ \ macro(JSOP_NEWTARGET, 148, "newtarget", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pops the top of stack value as 'unwrapped', converts it to async * function 'wrapped', and pushes 'wrapped' back on the stack. * Category: Statements * Type: Function * Operands: * Stack: unwrapped => wrapped */ \ macro(JSOP_TOASYNC, 149, "toasync", NULL, 1, 1, 1, JOF_BYTE) \ /* * Pops the top two values 'lval' and 'rval' from the stack, then pushes * the result of 'Math.pow(lval, rval)'. * Category: Operators * Type: Arithmetic Operators * Operands: * Stack: lval, rval => (lval ** rval) */ \ macro(JSOP_POW, 150, "pow", "**", 1, 2, 1, JOF_BYTE|JOF_ARITH) \ \ /* * Pops the top of stack value as 'v', sets pending exception as 'v', * to trigger rethrow. * * This opcode is used in conditional catch clauses. * Category: Statements * Type: Exception Handling * Operands: * Stack: v => */ \ macro(JSOP_THROWING, 151,"throwing", NULL, 1, 1, 0, JOF_BYTE) \ \ /* * Pops the top of stack value as 'rval', sets the return value in stack * frame as 'rval'. * Category: Statements * Type: Function * Operands: * Stack: rval => */ \ macro(JSOP_SETRVAL, 152,"setrval", NULL, 1, 1, 0, JOF_BYTE) \ /* * Stops interpretation and returns value set by JSOP_SETRVAL. When not set, * returns 'undefined'. * * Also emitted at end of script so interpreter don't need to check if * opcode is still in script range. * Category: Statements * Type: Function * Operands: * Stack: => */ \ macro(JSOP_RETRVAL, 153,"retrval", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Looks up name on global scope and pushes its value onto the stack, * unless the script has a non-syntactic global scope, in which case it * acts just like JSOP_NAME. * * Free variable references that must either be found on the global or a * ReferenceError. * Category: Variables and Scopes * Type: Free Variables * Operands: uint32_t nameIndex * Stack: => val */ \ macro(JSOP_GETGNAME, 154,"getgname", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_TYPESET|JOF_GNAME) \ /* * Pops the top two values on the stack as 'val' and 'scope', sets property * of 'scope' as 'val' and pushes 'val' back on the stack. * * 'scope' should be the global scope unless the script has a non-syntactic * global scope, in which case acts like JSOP_SETNAME. * Category: Variables and Scopes * Type: Free Variables * Operands: uint32_t nameIndex * Stack: scope, val => val */ \ macro(JSOP_SETGNAME, 155,"setgname", NULL, 5, 2, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_GNAME|JOF_CHECKSLOPPY) \ \ /* * Pops the top two values on the stack as 'val' and 'scope', sets property * of 'scope' as 'val' and pushes 'val' back on the stack. Throws a * TypeError if the set fails, per strict mode semantics. * * 'scope' should be the global scope unless the script has a non-syntactic * global scope, in which case acts like JSOP_STRICTSETNAME. * Category: Variables and Scopes * Type: Free Variables * Operands: uint32_t nameIndex * Stack: scope, val => val */ \ macro(JSOP_STRICTSETGNAME, 156, "strict-setgname", NULL, 5, 2, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_GNAME|JOF_CHECKSTRICT) \ /* * Pushes the implicit 'this' value for calls to the associated name onto * the stack; only used when we know this implicit this will be our first * non-syntactic scope. * * Category: Variables and Scopes * Type: This * Operands: uint32_t nameIndex * Stack: => this */ \ macro(JSOP_GIMPLICITTHIS, 157, "gimplicitthis", "", 5, 0, 1, JOF_ATOM) \ /* * LIKE JSOP_SETELEM, but takes receiver on the stack, and the propval is * evaluated before the base. * Category: Literals * Type: Object * Operands: * Stack: propval, receiver, obj, val => val */ \ macro(JSOP_SETELEM_SUPER, 158, "setelem-super", NULL, 1, 4, 1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING|JOF_CHECKSLOPPY) \ /* * LIKE JSOP_STRICTSETELEM, but takes receiver on the stack, and the * propval is evaluated before the base. * Category: Literals * Type: Object * Operands: * Stack: propval, receiver, obj, val => val */ \ macro(JSOP_STRICTSETELEM_SUPER, 159, "strict-setelem-super", NULL, 1, 4, 1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING|JOF_CHECKSTRICT) \ \ /* * Pushes a regular expression literal onto the stack. * It requires special "clone on exec" handling. * Category: Literals * Type: RegExp * Operands: uint32_t regexpIndex * Stack: => regexp */ \ macro(JSOP_REGEXP, 160,"regexp", NULL, 5, 0, 1, JOF_REGEXP) \ \ /* * Initializes an uninitialized global lexical binding with the top of * stack value. * Category: Variables and Scopes * Type: Free Variables * Operands: uint32_t nameIndex * Stack: val => val */ \ macro(JSOP_INITGLEXICAL, 161,"initglexical", NULL, 5, 1, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_GNAME) \ \ /* Defines the new mutable binding on global lexical scope. * * Throws if a binding with the same name already exists on the scope, or * if a var binding with the same name exists on the global. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => */ \ macro(JSOP_DEFLET, 162,"deflet", NULL, 5, 0, 0, JOF_ATOM) \ /* * Throw if the value on the stack is not coerscible to an object (is |null| or |undefined|). * Category: Literals * Type: Object * Operands: * Stack: val => val */ \ macro(JSOP_CHECKOBJCOERCIBLE, 163, "checkobjcoercible", NULL, 1, 1, 1, JOF_BYTE) \ /* * Find the function to invoke with |super()| on the scope chain. * * Category: Variables and Scopes * Type: Super * Operands: * Stack: => superFun */ \ macro(JSOP_SUPERFUN, 164,"superfun", NULL, 1, 0, 1, JOF_BYTE) \ /* * Behaves exactly like JSOP_NEW, but allows JITs to distinguish the two cases. * * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1], newTarget => rval * nuses: (argc+3) */ \ macro(JSOP_SUPERCALL, 165,"supercall", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \ /* * spreadcall variant of JSOP_SUPERCALL. * * Behaves exactly like JSOP_SPREADNEW. * * Category: Statements * Type: Function * Operands: * Stack: callee, this, args, newTarget => rval */ \ macro(JSOP_SPREADSUPERCALL, 166, "spreadsupercall", NULL, 1, 4, 1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \ /* * Push a default constructor for a base class literal. * * Category: Literals * Type: Class * Operands: atom className * Stack: => constructor */ \ macro(JSOP_CLASSCONSTRUCTOR, 167,"classconstructor", NULL, 5, 0, 1, JOF_ATOM) \ /* * Push a default constructor for a derived class literal. * * Category: Literals * Type: Class * Operands: atom className * Stack: => constructor */ \ macro(JSOP_DERIVEDCONSTRUCTOR, 168,"derivedconstructor", NULL, 5, 1, 1, JOF_ATOM) \ /* * Throws a runtime TypeError for invalid assignment to 'const'. The * localno is used for better error messages. * * Category: Variables and Scopes * Type: Local Variables * Operands: uint32_t localno * Stack: => */ \ macro(JSOP_THROWSETCONST, 169, "throwsetconst", NULL, 4, 1, 1, JOF_LOCAL|JOF_NAME|JOF_SET|JOF_DETECTING) \ /* * Throws a runtime TypeError for invalid assignment to 'const'. The * scope coordinate is used for better error messages. * * Category: Variables and Scopes * Type: Aliased Variables * Operands: uint8_t hops, uint24_t slot * Stack: => */ \ macro(JSOP_THROWSETALIASEDCONST, 170, "throwsetaliasedconst", NULL, 5, 1, 1, JOF_ENVCOORD|JOF_NAME|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable getter in an object literal. * * Pops the top two values on the stack as 'val' and 'obj', defines * getter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITHIDDENPROP_GETTER, 171, "inithiddenprop_getter", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable setter in an object literal. * * Pops the top two values on the stack as 'val' and 'obj', defines * setter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj, val => obj */ \ macro(JSOP_INITHIDDENPROP_SETTER, 172, "inithiddenprop_setter", NULL, 5, 2, 1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable numeric getter in an object literal like * '{get 2() {}}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' getter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITHIDDENELEM_GETTER, 173, "inithiddenelem_getter", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable numeric setter in an object literal like * '{set 2(v) {}}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' setter of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITHIDDENELEM_SETTER, 174, "inithiddenelem_setter", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ /* * Initialize a non-enumerable numeric property in an object literal, like '{1: x}'. * * Pops the top three values on the stack as 'val', 'id' and 'obj', defines * 'id' property of 'obj' as 'val', pushes 'obj' onto the stack. * Category: Literals * Type: Object * Operands: * Stack: obj, id, val => obj */ \ macro(JSOP_INITHIDDENELEM, 175, "inithiddenelem", NULL, 1, 3, 1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \ /* * Gets the value of a module import by name and pushes it onto the stack. * Category: Variables and Scopes * Type: Variables * Operands: uint32_t nameIndex * Stack: => val */ \ macro(JSOP_GETIMPORT, 176,"getimport", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \ /* * Examines the top stack value, asserting that it's either a self-hosted * function or a self-hosted intrinsic. This opcode does nothing in a * non-debug build. * Category: Other * Operands: * Stack: checkVal => checkVal */ \ macro(JSOP_DEBUGCHECKSELFHOSTED, 177,"debug-checkselfhosted", NULL, 1, 1, 1, JOF_BYTE) \ /* * Pops the top stack value, pushes the value and a boolean value that * indicates whether the spread operation for the value can be optimized * in spread call. * Category: Statements * Type: Function * Operands: * Stack: arr => arr optimized */ \ macro(JSOP_OPTIMIZE_SPREADCALL,178,"optimize-spreadcall", NULL, 1, 1, 2, JOF_BYTE) \ /* * Throws a runtime TypeError for invalid assignment to the callee in a * named lambda, which is always a 'const' binding. This is a different * bytecode than JSOP_SETCONST because the named lambda callee, if not * closed over, does not have a frame slot to look up the name with for * the error message. * * Category: Variables and Scopes * Type: Local Variables * Operands: * Stack: => */ \ macro(JSOP_THROWSETCALLEE, 179, "throwsetcallee", NULL, 1, 1, 1, JOF_SET|JOF_BYTE) \ /* * Pushes a var environment onto the env chain. * Category: Variables and Scopes * Type: Var Scope * Operands: uint32_t scopeIndex * Stack: => */ \ macro(JSOP_PUSHVARENV, 180, "pushvarenv", NULL, 5, 0, 0, JOF_SCOPE) \ /* * Pops a var environment from the env chain. * Category: Variables and Scopes * Type: Var Scope * Operands: * Stack: => */ \ macro(JSOP_POPVARENV, 181, "popvarenv", NULL, 1, 0, 0, JOF_BYTE) \ /* * Pops the top two values on the stack as 'name' and 'fun', defines the * name of 'fun' to 'name' with prefix if any, and pushes 'fun' back onto * the stack. * Category: Statements * Type: Function * Operands: uint8_t prefixKind * Stack: fun, name => fun */ \ macro(JSOP_SETFUNNAME, 182,"setfunname", NULL, 2, 2, 1, JOF_UINT8) \ /* * Moves the top of the stack value under the nth element of the stack. * Category: Operators * Type: Stack Operations * Operands: uint8_t n * Stack: v[n], v[n-1], ..., v[1], v[0] => v[0], v[n], v[n-1], ..., v[1] */ \ macro(JSOP_UNPICK, 183,"unpick", NULL, 2, 0, 0, JOF_UINT8) \ /* * Pops the top of stack value, pushes property of it onto the stack. * * Like JSOP_GETPROP but for call context. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj => obj[name] */ \ macro(JSOP_CALLPROP, 184,"callprop", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_TYPESET) \ /* * Determines the 'this' value for current function frame and pushes it onto * the stack. Emitted in the prologue of functions with a this-binding. * Category: Variables and Scopes * Type: This * Operands: * Stack: => this */ \ macro(JSOP_FUNCTIONTHIS, 185,"functionthis",NULL, 1, 0, 1, JOF_BYTE) \ /* * Pushes 'this' value for current stack frame onto the stack. Emitted when * 'this' refers to the global 'this'. * Category: Variables and Scopes * Type: This * Operands: * Stack: => this */ \ macro(JSOP_GLOBALTHIS, 186,"globalthis", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pushes a boolean indicating whether the top of the stack is * MagicValue(JS_GENERATOR_CLOSING). * * Category: Statements * Type: For-In Statement * Operands: * Stack: val => val, res */ \ macro(JSOP_ISGENCLOSING, 187, "isgenclosing", NULL, 1, 1, 2, JOF_BYTE) \ /* * Pushes unsigned 24-bit int immediate integer operand onto the stack. * Category: Literals * Type: Constants * Operands: uint24_t val * Stack: => val */ \ macro(JSOP_UINT24, 188,"uint24", NULL, 4, 0, 1, JOF_UINT24) \ /* * Throw if the value on top of the stack is the TDZ MagicValue. Used in * derived class constructors. * Category: Variables and Scopes * Type: This * Operands: * Stack: this => this */ \ macro(JSOP_CHECKTHIS, 189,"checkthis", NULL, 1, 1, 1, JOF_BYTE) \ /* * Check if a derived class constructor has a valid return value and 'this' * value before it returns. If the return value is not an object, stores * the 'this' value to the return value slot. * Category: Variables and Scopes * Type: This * Operands: * Stack: this => */ \ macro(JSOP_CHECKRETURN, 190,"checkreturn", NULL, 1, 1, 0, JOF_BYTE) \ /* * Throw an exception if the value on top of the stack is not the TDZ * MagicValue. Used in derived class constructors. * Category: Variables and Scopes * Type: This * Operands: * Stack: this => this */ \ macro(JSOP_CHECKTHISREINIT,191,"checkthisreinit",NULL,1, 1, 1, JOF_BYTE) \ macro(JSOP_UNUSED192, 192,"unused192", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Pops the top two values on the stack as 'propval' and 'obj', pushes * 'propval' property of 'obj' onto the stack. * * Like JSOP_GETELEM but for call context. * Category: Literals * Type: Object * Operands: * Stack: obj, propval => obj[propval] */ \ macro(JSOP_CALLELEM, 193, "callelem", NULL, 1, 2, 1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC) \ \ /* * '__proto__: v' inside an object initializer. * * Pops the top two values on the stack as 'newProto' and 'obj', sets * prototype of 'obj' as 'newProto', pushes 'true' onto the stack if * succeeded, 'false' if not. * Category: Literals * Type: Object * Operands: * Stack: obj, newProto => succeeded */ \ macro(JSOP_MUTATEPROTO, 194, "mutateproto",NULL, 1, 2, 1, JOF_BYTE) \ \ /* * Pops the top of stack value, gets an extant property value of it, * throwing ReferenceError if the identified property does not exist. * Category: Literals * Type: Object * Operands: uint32_t nameIndex * Stack: obj => obj[name] */ \ macro(JSOP_GETXPROP, 195,"getxprop", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_TYPESET) \ \ /* * Pops the top stack value as 'val' and pushes 'typeof val'. Note that * this opcode isn't used when, in the original source code, 'val' is a * name -- see 'JSOP_TYPEOF' for that. * (This is because 'typeof undefinedName === "undefined"'.) * Category: Operators * Type: Special Operators * Operands: * Stack: val => (typeof val) */ \ macro(JSOP_TYPEOFEXPR, 196,"typeofexpr", NULL, 1, 1, 1, JOF_BYTE|JOF_DETECTING) \ \ /* Lexical environment support. */ \ /* * Replaces the current block on the env chain with a fresh block * that copies all the bindings in the bock. This operation implements the * behavior of inducing a fresh lexical environment for every iteration of a * for(let ...; ...; ...) loop, if any declarations induced by such a loop * are captured within the loop. * Category: Variables and Scopes * Type: Block-local Scope * Operands: * Stack: => */ \ macro(JSOP_FRESHENLEXICALENV,197,"freshenlexicalenv", NULL, 1, 0, 0, JOF_BYTE) \ /* * Recreates the current block on the env chain with a fresh block * with uninitialized bindings. This operation implements the behavior of * inducing a fresh lexical environment for every iteration of a for-in/of loop * whose loop-head has a (captured) lexical declaration. * Category: Variables and Scopes * Type: Block-local Scope * Operands: * Stack: => */ \ macro(JSOP_RECREATELEXICALENV,198,"recreatelexicalenv",NULL,1,0,0,JOF_BYTE) \ /* * Pushes lexical environment onto the env chain. * Category: Variables and Scopes * Type: Block-local Scope * Operands: uint32_t scopeIndex * Stack: => */ \ macro(JSOP_PUSHLEXICALENV,199,"pushlexicalenv", NULL, 5, 0, 0, JOF_SCOPE) \ /* * Pops lexical environment from the env chain. * Category: Variables and Scopes * Type: Block-local Scope * Operands: * Stack: => */ \ macro(JSOP_POPLEXICALENV, 200,"poplexicalenv", NULL, 1, 0, 0, JOF_BYTE) \ /* * The opcode to assist the debugger. * Category: Statements * Type: Debugger * Operands: * Stack: => */ \ macro(JSOP_DEBUGLEAVELEXICALENV, 201,"debugleavelexicalenv", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Pops the generator from the top of the stack, suspends it and stops * interpretation. * Category: Statements * Type: Generator * Operands: uint24_t yieldAndAwaitIndex * Stack: generator => */ \ macro(JSOP_INITIALYIELD, 202,"initialyield", NULL, 4, 1, 1, JOF_UINT24) \ /* * Pops the generator and the return value 'rval1', stops interpretation and * returns 'rval1'. Pushes sent value from 'send()' onto the stack. * Category: Statements * Type: Generator * Operands: uint24_t yieldAndAwaitIndex * Stack: rval1, gen => rval2 */ \ macro(JSOP_YIELD, 203,"yield", NULL, 4, 2, 1, JOF_UINT24) \ /* * Pops the generator and suspends and closes it. Yields the value in the * frame's return value slot. * Category: Statements * Type: Generator * Operands: * Stack: gen => */ \ macro(JSOP_FINALYIELDRVAL,204,"finalyieldrval",NULL, 1, 1, 0, JOF_BYTE) \ /* * Pops the generator and argument from the stack, pushes a new generator * frame and resumes execution of it. Pushes the return value after the * generator yields. * Category: Statements * Type: Generator * Operands: resume kind (GeneratorObject::ResumeKind) * Stack: gen, val => rval */ \ macro(JSOP_RESUME, 205,"resume", NULL, 3, 2, 1, JOF_UINT8|JOF_INVOKE) \ /* * Pops the top two values on the stack as 'obj' and 'v', pushes 'v' to * 'obj'. * * This opcode is used for Array Comprehension. * Category: Literals * Type: Array * Operands: * Stack: v, obj => */ \ macro(JSOP_ARRAYPUSH, 206,"arraypush", NULL, 1, 2, 0, JOF_BYTE) \ \ /* * No-op bytecode only emitted in some self-hosted functions. Not handled by * the JITs so the script always runs in the interpreter. * * Category: Other * Operands: * Stack: => */ \ macro(JSOP_FORCEINTERPRETER, 207, "forceinterpreter", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Bytecode emitted after 'yield' expressions to help the Debugger * fix up the frame in the JITs. No-op in the interpreter. * * Category: Operators * Type: Debugger * Operands: * Stack: => */ \ macro(JSOP_DEBUGAFTERYIELD, 208, "debugafteryield", NULL, 1, 0, 0, JOF_BYTE) \ /* * Pops the generator and the return value 'promise', stops interpretation * and returns 'promise'. Pushes resolved value onto the stack. * Category: Statements * Type: Generator * Operands: uint24_t yieldAndAwaitIndex * Stack: promise, gen => resolved */ \ macro(JSOP_AWAIT, 209, "await", NULL, 4, 2, 1, JOF_UINT24) \ macro(JSOP_UNUSED210, 210, "unused210", NULL, 1, 0, 0, JOF_BYTE) \ macro(JSOP_UNUSED211, 211, "unused211", NULL, 1, 0, 0, JOF_BYTE) \ /* * Initializes generator frame, creates a generator and pushes it on the * stack. * Category: Statements * Type: Generator * Operands: * Stack: => generator */ \ macro(JSOP_GENERATOR, 212,"generator", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pushes the nearest 'var' environment. * * Category: Variables and Scopes * Type: Free Variables * Operands: * Stack: => scope */ \ macro(JSOP_BINDVAR, 213, "bindvar", NULL, 1, 0, 1, JOF_BYTE) \ /* * Pushes the global scope onto the stack if the script doesn't have a * non-syntactic global scope. Otherwise will act like JSOP_BINDNAME. * * 'nameIndex' is only used when acting like JSOP_BINDNAME. * Category: Variables and Scopes * Type: Free Variables * Operands: uint32_t nameIndex * Stack: => global */ \ macro(JSOP_BINDGNAME, 214, "bindgname", NULL, 5, 0, 1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_GNAME) \ \ /* * Pushes 8-bit int immediate integer operand onto the stack. * Category: Literals * Type: Constants * Operands: int8_t val * Stack: => val */ \ macro(JSOP_INT8, 215, "int8", NULL, 2, 0, 1, JOF_INT8) \ /* * Pushes 32-bit int immediate integer operand onto the stack. * Category: Literals * Type: Constants * Operands: int32_t val * Stack: => val */ \ macro(JSOP_INT32, 216, "int32", NULL, 5, 0, 1, JOF_INT32) \ \ /* * Pops the top of stack value, pushes the 'length' property of it onto the * stack. * Category: Literals * Type: Array * Operands: uint32_t nameIndex * Stack: obj => obj['length'] */ \ macro(JSOP_LENGTH, 217, "length", NULL, 5, 1, 1, JOF_ATOM|JOF_PROP|JOF_TYPESET) \ \ /* * Pushes a JS_ELEMENTS_HOLE value onto the stack, representing an omitted * property in an array literal (e.g. property 0 in the array '[, 1]'). * * This opcode is used with the JSOP_NEWARRAY opcode. * Category: Literals * Type: Array * Operands: * Stack: => hole */ \ macro(JSOP_HOLE, 218, "hole", NULL, 1, 0, 1, JOF_BYTE) \ \ /* * Checks that the top value on the stack is callable, and throws a * TypeError if not. The operand 'kind' is used only to generate an * appropriate error message. * Category: Statements * Type: Function * Operands: uint8_t kind * Stack: result => result, callable */ \ macro(JSOP_CHECKISCALLABLE, 219, "checkiscallable", NULL, 2, 1, 1, JOF_UINT8) \ \ /* * No-op used by the exception unwinder to determine the correct * environment to unwind to when performing IteratorClose due to * destructuring. * Category: Other * Operands: * Stack: => */ \ macro(JSOP_TRY_DESTRUCTURING_ITERCLOSE, 220, "try-destructuring-iterclose", NULL, 1, 0, 0, JOF_BYTE) \ macro(JSOP_UNUSED221, 221,"unused221", NULL, 1, 0, 0, JOF_BYTE) \ macro(JSOP_UNUSED222, 222,"unused222", NULL, 1, 0, 0, JOF_BYTE) \ macro(JSOP_UNUSED223, 223,"unused223", NULL, 1, 0, 0, JOF_BYTE) \ \ /* * Creates rest parameter array for current function call, and pushes it * onto the stack. * Category: Variables and Scopes * Type: Arguments * Operands: * Stack: => rest */ \ macro(JSOP_REST, 224, "rest", NULL, 1, 0, 1, JOF_BYTE|JOF_TYPESET) \ \ /* * Replace the top-of-stack value propertyNameValue with * ToPropertyKey(propertyNameValue). * Category: Literals * Type: Object * Operands: * Stack: propertyNameValue => propertyKey */ \ macro(JSOP_TOID, 225, "toid", NULL, 1, 1, 1, JOF_BYTE) \ \ /* * Pushes the implicit 'this' value for calls to the associated name onto * the stack. * Category: Variables and Scopes * Type: This * Operands: uint32_t nameIndex * Stack: => this */ \ macro(JSOP_IMPLICITTHIS, 226, "implicitthis", "", 5, 0, 1, JOF_ATOM) \ \ /* * This opcode is the target of the entry jump for some loop. The uint8 * argument is a bitfield. The lower 7 bits of the argument indicate the * loop depth. This value starts at 1 and is just a hint: deeply nested * loops all have the same value. The upper bit is set if Ion should be * able to OSR at this point, which is true unless there is non-loop state * on the stack. * Category: Statements * Type: Jumps * Operands: uint8_t BITFIELD * Stack: => */ \ macro(JSOP_LOOPENTRY, 227, "loopentry", NULL, 2, 0, 0, JOF_UINT8) \ /* * Converts the value on the top of the stack to a String * Category: Other * Operands: * Stack: val => ToString(val) */ \ macro(JSOP_TOSTRING, 228, "tostring", NULL, 1, 1, 1, JOF_BYTE) \ /* * No-op used by the decompiler to produce nicer error messages about * destructuring code. * Category: Other * Operands: * Stack: => */ \ macro(JSOP_NOP_DESTRUCTURING, 229, "nop-destructuring", NULL, 1, 0, 0, JOF_BYTE) \ /* * This opcode is a no-op and it indicates the location of a jump * instruction target. Some other opcodes act as jump targets, such as * LOOPENTRY, as well as all which are matched by BytecodeIsJumpTarget * function. * Category: Other * Operands: * Stack: => */ \ macro(JSOP_JUMPTARGET, 230, "jumptarget", NULL, 1, 0, 0, JOF_BYTE)\ /* * Like JSOP_CALL, but tells the function that the return value is ignored. * stack. * Category: Statements * Type: Function * Operands: uint16_t argc * Stack: callee, this, args[0], ..., args[argc-1] => rval * nuses: (argc+2) */ \ macro(JSOP_CALL_IGNORES_RV, 231, "call-ignores-rv", NULL, 3, -1, 1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) /* * In certain circumstances it may be useful to "pad out" the opcode space to * a power of two. Use this macro to do so. */ #define FOR_EACH_TRAILING_UNUSED_OPCODE(macro) \ macro(232) \ macro(233) \ macro(234) \ macro(235) \ macro(236) \ macro(237) \ macro(238) \ macro(239) \ macro(240) \ macro(241) \ macro(242) \ macro(243) \ macro(244) \ macro(245) \ macro(246) \ macro(247) \ macro(248) \ macro(249) \ macro(250) \ macro(251) \ macro(252) \ macro(253) \ macro(254) \ macro(255) namespace js { // Sanity check that opcode values and trailing unused opcodes completely cover // the [0, 256) range. Avert your eyes! You don't want to know how the // sausage gets made. #define VALUE_AND_VALUE_PLUS_ONE(op, val, ...) \ val) && (val + 1 == #define TRAILING_VALUE_AND_VALUE_PLUS_ONE(val) \ val) && (val + 1 == static_assert((0 == FOR_EACH_OPCODE(VALUE_AND_VALUE_PLUS_ONE) FOR_EACH_TRAILING_UNUSED_OPCODE(TRAILING_VALUE_AND_VALUE_PLUS_ONE) 256), "opcode values and trailing unused opcode values monotonically " "increase from zero to 255"); #undef TRAILING_VALUE_AND_VALUE_PLUS_ONE #undef VALUE_AND_VALUE_PLUS_ONE // Define JSOP_*_LENGTH constants for all ops. #define DEFINE_LENGTH_CONSTANT(op, val, name, image, len, ...) \ constexpr size_t op##_LENGTH = len; FOR_EACH_OPCODE(DEFINE_LENGTH_CONSTANT) #undef DEFINE_LENGTH_CONSTANT } // namespace js #endif // vm_Opcodes_h