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472 lines
20 KiB
472 lines
20 KiB
/*
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* Ecmascript bytecode
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*/
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#ifndef DUK_JS_BYTECODE_H_INCLUDED
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#define DUK_JS_BYTECODE_H_INCLUDED
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/*
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* Bytecode instruction layout
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* ===========================
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*
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* Instructions are unsigned 32-bit integers divided as follows:
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*
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* !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! !
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* !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!
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* +-----------------------------------------------+---------------+
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* ! C ! B ! A ! OP !
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* +-----------------------------------------------+---------------+
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*
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* OP (8 bits): opcode (DUK_OP_*), access should be fastest
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* consecutive opcodes allocated when opcode needs flags
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* A (8 bits): typically a target register number
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* B (8 bits): typically first source register/constant number
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* C (8 bits): typically second source register/constant number
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*
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* Some instructions combine BC or ABC together for larger parameter values.
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* Signed integers (e.g. jump offsets) are encoded as unsigned, with an
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* opcode specific bias.
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*
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* Some opcodes have flags which are handled by allocating consecutive
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* opcodes to make space for 1-N flags. Flags can also be e.g. in the 'A'
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* field when there's room for the specific opcode.
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*
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* For example, if three flags were needed, they could be allocated from
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* the opcode field as follows:
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*
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* !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! !
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* !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!
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* +-----------------------------------------------+---------------+
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* ! C ! B ! A ! OP !Z!Y!X!
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* +-----------------------------------------------+---------------+
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*
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* Some opcodes accept a reg/const argument which is handled by allocating
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* flags in the OP field, see DUK_BC_ISREG() and DUK_BC_ISCONST(). The
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* following convention is shared by most opcodes, so that the compiler
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* can handle reg/const flagging without opcode specific code paths:
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*
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* !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! !
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* !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!
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* +-----------------------------------------------+---------------+
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* ! C ! B ! A ! OP !Y!X!
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* +-----------------------------------------------+---------------+
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*
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* X 1=B is const, 0=B is reg
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* Y 1=C is const, 0=C is reg
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*
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* In effect OP, OP + 1, OP + 2, and OP + 3 are allocated from the
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* 8-bit opcode space for a single logical opcode. The base opcode
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* number should be divisible by 4. If the opcode is called 'FOO'
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* the following opcode constants would be defined:
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*
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* DUK_OP_FOO 100 // base opcode number
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* DUK_OP_FOO_RR 100 // FOO, B=reg, C=reg
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* DUK_OP_FOO_CR 101 // FOO, B=const, C=reg
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* DUK_OP_FOO_RC 102 // FOO, B=reg, C=const
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* DUK_OP_FOO_CC 103 // FOO, B=const, C=const
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*
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* If only B or C is a reg/const, the unused opcode combinations can be
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* used for other opcodes (which take no reg/const argument). However,
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* such opcode values are initially reserved, at least while opcode space
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* is available. For example, if 'BAR' uses B for a register field and
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* C is a reg/const:
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*
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* DUK_OP_BAR 116 // base opcode number
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* DUK_OP_BAR_RR 116 // BAR, B=reg, C=reg
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* DUK_OP_BAR_CR_UNUSED 117 // unused, could be repurposed
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* DUK_OP_BAR_RC 118 // BAR, B=reg, C=const
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* DUK_OP_BAR_CC_UNUSED 119 // unused, could be repurposed
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*
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* Macro naming is a bit misleading, e.g. "ABC" in macro name but the
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* field layout is concretely "CBA" in the register.
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*/
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typedef duk_uint32_t duk_instr_t;
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#define DUK_BC_SHIFT_OP 0
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#define DUK_BC_SHIFT_A 8
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#define DUK_BC_SHIFT_B 16
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#define DUK_BC_SHIFT_C 24
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#define DUK_BC_SHIFT_BC DUK_BC_SHIFT_B
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#define DUK_BC_SHIFT_ABC DUK_BC_SHIFT_A
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#define DUK_BC_UNSHIFTED_MASK_OP 0xffUL
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#define DUK_BC_UNSHIFTED_MASK_A 0xffUL
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#define DUK_BC_UNSHIFTED_MASK_B 0xffUL
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#define DUK_BC_UNSHIFTED_MASK_C 0xffUL
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#define DUK_BC_UNSHIFTED_MASK_BC 0xffffUL
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#define DUK_BC_UNSHIFTED_MASK_ABC 0xffffffUL
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#define DUK_BC_SHIFTED_MASK_OP (DUK_BC_UNSHIFTED_MASK_OP << DUK_BC_SHIFT_OP)
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#define DUK_BC_SHIFTED_MASK_A (DUK_BC_UNSHIFTED_MASK_A << DUK_BC_SHIFT_A)
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#define DUK_BC_SHIFTED_MASK_B (DUK_BC_UNSHIFTED_MASK_B << DUK_BC_SHIFT_B)
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#define DUK_BC_SHIFTED_MASK_C (DUK_BC_UNSHIFTED_MASK_C << DUK_BC_SHIFT_C)
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#define DUK_BC_SHIFTED_MASK_BC (DUK_BC_UNSHIFTED_MASK_BC << DUK_BC_SHIFT_BC)
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#define DUK_BC_SHIFTED_MASK_ABC (DUK_BC_UNSHIFTED_MASK_ABC << DUK_BC_SHIFT_ABC)
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#define DUK_DEC_OP(x) ((x) & 0xffUL)
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#define DUK_DEC_A(x) (((x) >> 8) & 0xffUL)
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#define DUK_DEC_B(x) (((x) >> 16) & 0xffUL)
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#define DUK_DEC_C(x) (((x) >> 24) & 0xffUL)
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#define DUK_DEC_BC(x) (((x) >> 16) & 0xffffUL)
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#define DUK_DEC_ABC(x) (((x) >> 8) & 0xffffffUL)
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#define DUK_ENC_OP(op) ((duk_instr_t) (op))
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#define DUK_ENC_OP_ABC(op,abc) ((duk_instr_t) ( \
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(((duk_instr_t) (abc)) << 8) | \
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((duk_instr_t) (op)) \
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))
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#define DUK_ENC_OP_A_BC(op,a,bc) ((duk_instr_t) ( \
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(((duk_instr_t) (bc)) << 16) | \
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(((duk_instr_t) (a)) << 8) | \
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((duk_instr_t) (op)) \
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))
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#define DUK_ENC_OP_A_B_C(op,a,b,c) ((duk_instr_t) ( \
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(((duk_instr_t) (c)) << 24) | \
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(((duk_instr_t) (b)) << 16) | \
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(((duk_instr_t) (a)) << 8) | \
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((duk_instr_t) (op)) \
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))
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#define DUK_ENC_OP_A_B(op,a,b) DUK_ENC_OP_A_B_C((op),(a),(b),0)
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#define DUK_ENC_OP_A(op,a) DUK_ENC_OP_A_B_C((op),(a),0,0)
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#define DUK_ENC_OP_BC(op,bc) DUK_ENC_OP_A_BC((op),0,(bc))
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/* Get opcode base value with B/C reg/const flags cleared. */
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#define DUK_BC_NOREGCONST_OP(op) ((op) & 0xfc)
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/* Constants should be signed so that signed arithmetic involving them
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* won't cause values to be coerced accidentally to unsigned.
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*/
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#define DUK_BC_OP_MIN 0
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#define DUK_BC_OP_MAX 0xffL
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#define DUK_BC_A_MIN 0
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#define DUK_BC_A_MAX 0xffL
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#define DUK_BC_B_MIN 0
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#define DUK_BC_B_MAX 0xffL
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#define DUK_BC_C_MIN 0
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#define DUK_BC_C_MAX 0xffL
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#define DUK_BC_BC_MIN 0
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#define DUK_BC_BC_MAX 0xffffL
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#define DUK_BC_ABC_MIN 0
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#define DUK_BC_ABC_MAX 0xffffffL
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/* Masks for B/C reg/const indicator in opcode field. */
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#define DUK_BC_REGCONST_B (0x01UL)
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#define DUK_BC_REGCONST_C (0x02UL)
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/* Misc. masks for opcode field. */
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#define DUK_BC_INCDECP_FLAG_DEC (0x04UL)
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#define DUK_BC_INCDECP_FLAG_POST (0x08UL)
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/* Opcodes. */
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#define DUK_OP_LDREG 0
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#define DUK_OP_STREG 1
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#define DUK_OP_LDCONST 2
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#define DUK_OP_LDINT 3
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#define DUK_OP_LDINTX 4
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#define DUK_OP_LDTHIS 5
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#define DUK_OP_LDUNDEF 6
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#define DUK_OP_LDNULL 7
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#define DUK_OP_LDTRUE 8
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#define DUK_OP_LDFALSE 9
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#define DUK_OP_BNOT 10
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#define DUK_OP_LNOT 11
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#define DUK_OP_UNM 12
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#define DUK_OP_UNP 13
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#define DUK_OP_TYPEOF 14
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#define DUK_OP_TYPEOFID 15
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#define DUK_OP_EQ 16
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#define DUK_OP_EQ_RR 16
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#define DUK_OP_EQ_CR 17
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#define DUK_OP_EQ_RC 18
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#define DUK_OP_EQ_CC 19
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#define DUK_OP_NEQ 20
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#define DUK_OP_NEQ_RR 20
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#define DUK_OP_NEQ_CR 21
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#define DUK_OP_NEQ_RC 22
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#define DUK_OP_NEQ_CC 23
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#define DUK_OP_SEQ 24
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#define DUK_OP_SEQ_RR 24
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#define DUK_OP_SEQ_CR 25
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#define DUK_OP_SEQ_RC 26
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#define DUK_OP_SEQ_CC 27
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#define DUK_OP_SNEQ 28
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#define DUK_OP_SNEQ_RR 28
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#define DUK_OP_SNEQ_CR 29
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#define DUK_OP_SNEQ_RC 30
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#define DUK_OP_SNEQ_CC 31
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#define DUK_OP_GT 32
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#define DUK_OP_GT_RR 32
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#define DUK_OP_GT_CR 33
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#define DUK_OP_GT_RC 34
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#define DUK_OP_GT_CC 35
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#define DUK_OP_GE 36
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#define DUK_OP_GE_RR 36
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#define DUK_OP_GE_CR 37
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#define DUK_OP_GE_RC 38
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#define DUK_OP_GE_CC 39
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#define DUK_OP_LT 40
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#define DUK_OP_LT_RR 40
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#define DUK_OP_LT_CR 41
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#define DUK_OP_LT_RC 42
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#define DUK_OP_LT_CC 43
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#define DUK_OP_LE 44
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#define DUK_OP_LE_RR 44
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#define DUK_OP_LE_CR 45
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#define DUK_OP_LE_RC 46
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#define DUK_OP_LE_CC 47
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#define DUK_OP_IFTRUE 48
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#define DUK_OP_IFTRUE_R 48
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#define DUK_OP_IFTRUE_C 49
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#define DUK_OP_IFFALSE 50
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#define DUK_OP_IFFALSE_R 50
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#define DUK_OP_IFFALSE_C 51
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#define DUK_OP_ADD 52
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#define DUK_OP_ADD_RR 52
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#define DUK_OP_ADD_CR 53
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#define DUK_OP_ADD_RC 54
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#define DUK_OP_ADD_CC 55
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#define DUK_OP_SUB 56
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#define DUK_OP_SUB_RR 56
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#define DUK_OP_SUB_CR 57
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#define DUK_OP_SUB_RC 58
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#define DUK_OP_SUB_CC 59
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#define DUK_OP_MUL 60
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#define DUK_OP_MUL_RR 60
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#define DUK_OP_MUL_CR 61
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#define DUK_OP_MUL_RC 62
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#define DUK_OP_MUL_CC 63
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#define DUK_OP_DIV 64
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#define DUK_OP_DIV_RR 64
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#define DUK_OP_DIV_CR 65
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#define DUK_OP_DIV_RC 66
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#define DUK_OP_DIV_CC 67
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#define DUK_OP_MOD 68
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#define DUK_OP_MOD_RR 68
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#define DUK_OP_MOD_CR 69
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#define DUK_OP_MOD_RC 70
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#define DUK_OP_MOD_CC 71
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#define DUK_OP_EXP 72
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#define DUK_OP_EXP_RR 72
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#define DUK_OP_EXP_CR 73
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#define DUK_OP_EXP_RC 74
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#define DUK_OP_EXP_CC 75
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#define DUK_OP_BAND 76
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#define DUK_OP_BAND_RR 76
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#define DUK_OP_BAND_CR 77
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#define DUK_OP_BAND_RC 78
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#define DUK_OP_BAND_CC 79
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#define DUK_OP_BOR 80
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#define DUK_OP_BOR_RR 80
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#define DUK_OP_BOR_CR 81
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#define DUK_OP_BOR_RC 82
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#define DUK_OP_BOR_CC 83
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#define DUK_OP_BXOR 84
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#define DUK_OP_BXOR_RR 84
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#define DUK_OP_BXOR_CR 85
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#define DUK_OP_BXOR_RC 86
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#define DUK_OP_BXOR_CC 87
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#define DUK_OP_BASL 88
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#define DUK_OP_BASL_RR 88
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#define DUK_OP_BASL_CR 89
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#define DUK_OP_BASL_RC 90
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#define DUK_OP_BASL_CC 91
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#define DUK_OP_BLSR 92
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#define DUK_OP_BLSR_RR 92
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#define DUK_OP_BLSR_CR 93
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#define DUK_OP_BLSR_RC 94
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#define DUK_OP_BLSR_CC 95
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#define DUK_OP_BASR 96
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#define DUK_OP_BASR_RR 96
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#define DUK_OP_BASR_CR 97
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#define DUK_OP_BASR_RC 98
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#define DUK_OP_BASR_CC 99
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#define DUK_OP_INSTOF 100
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#define DUK_OP_INSTOF_RR 100
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#define DUK_OP_INSTOF_CR 101
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#define DUK_OP_INSTOF_RC 102
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#define DUK_OP_INSTOF_CC 103
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#define DUK_OP_IN 104
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#define DUK_OP_IN_RR 104
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#define DUK_OP_IN_CR 105
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#define DUK_OP_IN_RC 106
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#define DUK_OP_IN_CC 107
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#define DUK_OP_GETPROP 108
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#define DUK_OP_GETPROP_RR 108
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#define DUK_OP_GETPROP_CR 109
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#define DUK_OP_GETPROP_RC 110
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#define DUK_OP_GETPROP_CC 111
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#define DUK_OP_PUTPROP 112
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#define DUK_OP_PUTPROP_RR 112
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#define DUK_OP_PUTPROP_CR 113
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#define DUK_OP_PUTPROP_RC 114
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#define DUK_OP_PUTPROP_CC 115
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#define DUK_OP_DELPROP 116
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#define DUK_OP_DELPROP_RR 116
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#define DUK_OP_DELPROP_CR_UNUSED 117 /* unused now */
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#define DUK_OP_DELPROP_RC 118
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#define DUK_OP_DELPROP_CC_UNUSED 119 /* unused now */
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#define DUK_OP_PREINCR 120 /* pre/post opcode values have constraints, */
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#define DUK_OP_PREDECR 121 /* see duk_js_executor.c and duk_js_compiler.c. */
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#define DUK_OP_POSTINCR 122
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#define DUK_OP_POSTDECR 123
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#define DUK_OP_PREINCV 124
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#define DUK_OP_PREDECV 125
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#define DUK_OP_POSTINCV 126
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#define DUK_OP_POSTDECV 127
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#define DUK_OP_PREINCP 128 /* pre/post inc/dec prop opcodes have constraints */
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#define DUK_OP_PREINCP_RR 128
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#define DUK_OP_PREINCP_CR 129
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#define DUK_OP_PREINCP_RC 130
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#define DUK_OP_PREINCP_CC 131
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#define DUK_OP_PREDECP 132
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#define DUK_OP_PREDECP_RR 132
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#define DUK_OP_PREDECP_CR 133
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#define DUK_OP_PREDECP_RC 134
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#define DUK_OP_PREDECP_CC 135
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#define DUK_OP_POSTINCP 136
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#define DUK_OP_POSTINCP_RR 136
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#define DUK_OP_POSTINCP_CR 137
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#define DUK_OP_POSTINCP_RC 138
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#define DUK_OP_POSTINCP_CC 139
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#define DUK_OP_POSTDECP 140
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#define DUK_OP_POSTDECP_RR 140
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#define DUK_OP_POSTDECP_CR 141
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#define DUK_OP_POSTDECP_RC 142
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#define DUK_OP_POSTDECP_CC 143
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#define DUK_OP_DECLVAR 144
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#define DUK_OP_DECLVAR_RR 144
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#define DUK_OP_DECLVAR_CR 145
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#define DUK_OP_DECLVAR_RC 146
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#define DUK_OP_DECLVAR_CC 147
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#define DUK_OP_REGEXP 148
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#define DUK_OP_REGEXP_RR 148
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#define DUK_OP_REGEXP_CR 149
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#define DUK_OP_REGEXP_RC 150
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#define DUK_OP_REGEXP_CC 151
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#define DUK_OP_CSVAR 152
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#define DUK_OP_CSVAR_RR 152
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#define DUK_OP_CSVAR_CR 153
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#define DUK_OP_CSVAR_RC 154
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#define DUK_OP_CSVAR_CC 155
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#define DUK_OP_CLOSURE 156
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#define DUK_OP_GETVAR 157
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#define DUK_OP_PUTVAR 158
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#define DUK_OP_DELVAR 159
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#define DUK_OP_JUMP 160
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#define DUK_OP_RETREG 161
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#define DUK_OP_RETUNDEF 162
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#define DUK_OP_RETCONST 163
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#define DUK_OP_RETCONSTN 164 /* return const without incref (e.g. number) */
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#define DUK_OP_LABEL 165
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#define DUK_OP_ENDLABEL 166
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#define DUK_OP_BREAK 167
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#define DUK_OP_CONTINUE 168
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#define DUK_OP_TRYCATCH 169
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#define DUK_OP_ENDTRY 170
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#define DUK_OP_ENDCATCH 171
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#define DUK_OP_ENDFIN 172
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#define DUK_OP_THROW 173
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#define DUK_OP_CSREG 174
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#define DUK_OP_EVALCALL 175
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#define DUK_OP_CALL 176 /* must be even */
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#define DUK_OP_TAILCALL 177 /* must be odd */
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#define DUK_OP_NEW 178
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#define DUK_OP_NEWOBJ 179
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#define DUK_OP_NEWARR 180
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#define DUK_OP_MPUTOBJ 181
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#define DUK_OP_MPUTOBJI 182
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#define DUK_OP_INITSET 183
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#define DUK_OP_INITGET 184
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#define DUK_OP_MPUTARR 185
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#define DUK_OP_MPUTARRI 186
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#define DUK_OP_SETALEN 187
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#define DUK_OP_INITENUM 188
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#define DUK_OP_NEXTENUM 189
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#define DUK_OP_INVLHS 190
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#define DUK_OP_DEBUGGER 191
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#define DUK_OP_NOP 192
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#define DUK_OP_INVALID 193
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#define DUK_OP_UNUSED194 194
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#define DUK_OP_UNUSED195 195
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#define DUK_OP_UNUSED196 196
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#define DUK_OP_UNUSED197 197
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#define DUK_OP_UNUSED198 198
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#define DUK_OP_UNUSED199 199
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#define DUK_OP_UNUSED200 200
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#define DUK_OP_UNUSED201 201
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#define DUK_OP_UNUSED202 202
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#define DUK_OP_UNUSED203 203
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#define DUK_OP_UNUSED204 204
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#define DUK_OP_UNUSED205 205
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#define DUK_OP_UNUSED206 206
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#define DUK_OP_UNUSED207 207
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#define DUK_OP_UNUSED208 208
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#define DUK_OP_UNUSED209 209
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#define DUK_OP_UNUSED210 210
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#define DUK_OP_UNUSED211 211
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#define DUK_OP_UNUSED212 212
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#define DUK_OP_UNUSED213 213
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#define DUK_OP_UNUSED214 214
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#define DUK_OP_UNUSED215 215
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#define DUK_OP_UNUSED216 216
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#define DUK_OP_UNUSED217 217
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#define DUK_OP_UNUSED218 218
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#define DUK_OP_UNUSED219 219
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#define DUK_OP_UNUSED220 220
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#define DUK_OP_UNUSED221 221
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#define DUK_OP_UNUSED222 222
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#define DUK_OP_UNUSED223 223
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#define DUK_OP_UNUSED224 224
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#define DUK_OP_UNUSED225 225
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#define DUK_OP_UNUSED226 226
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#define DUK_OP_UNUSED227 227
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#define DUK_OP_UNUSED228 228
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#define DUK_OP_UNUSED229 229
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#define DUK_OP_UNUSED230 230
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#define DUK_OP_UNUSED231 231
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#define DUK_OP_UNUSED232 232
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#define DUK_OP_UNUSED233 233
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#define DUK_OP_UNUSED234 234
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#define DUK_OP_UNUSED235 235
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#define DUK_OP_UNUSED236 236
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#define DUK_OP_UNUSED237 237
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#define DUK_OP_UNUSED238 238
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#define DUK_OP_UNUSED239 239
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#define DUK_OP_UNUSED240 240
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#define DUK_OP_UNUSED241 241
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#define DUK_OP_UNUSED242 242
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#define DUK_OP_UNUSED243 243
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#define DUK_OP_UNUSED244 244
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#define DUK_OP_UNUSED245 245
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#define DUK_OP_UNUSED246 246
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#define DUK_OP_UNUSED247 247
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#define DUK_OP_UNUSED248 248
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#define DUK_OP_UNUSED249 249
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#define DUK_OP_UNUSED250 250
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#define DUK_OP_UNUSED251 251
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#define DUK_OP_UNUSED252 252
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#define DUK_OP_UNUSED253 253
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#define DUK_OP_UNUSED254 254
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#define DUK_OP_UNUSED255 255
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#define DUK_OP_NONE 256 /* dummy value used as marker (doesn't fit in 8-bit field) */
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/* XXX: Allocate flags from opcode field? Would take 16 opcode slots
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* but avoids shuffling in more cases. Maybe not worth it.
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*/
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/* DUK_OP_TRYCATCH flags in A */
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#define DUK_BC_TRYCATCH_FLAG_HAVE_CATCH (1 << 0)
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#define DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY (1 << 1)
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#define DUK_BC_TRYCATCH_FLAG_CATCH_BINDING (1 << 2)
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#define DUK_BC_TRYCATCH_FLAG_WITH_BINDING (1 << 3)
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/* DUK_OP_DECLVAR flags in A; bottom bits are reserved for propdesc flags (DUK_PROPDESC_FLAG_XXX) */
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#define DUK_BC_DECLVAR_FLAG_UNDEF_VALUE (1 << 4) /* use 'undefined' for value automatically */
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#define DUK_BC_DECLVAR_FLAG_FUNC_DECL (1 << 5) /* function declaration */
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/* Misc constants and helper macros. */
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#define DUK_BC_LDINT_BIAS (1L << 15)
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#define DUK_BC_LDINTX_SHIFT 16
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#define DUK_BC_JUMP_BIAS (1L << 23)
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#endif /* DUK_JS_BYTECODE_H_INCLUDED */
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