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#ifndef AMALGAM_BYTECODE_H
#define AMALGAM_BYTECODE_H
#include "../std/defs.h"
#include "../std/misc.h"
#include "../std/buffer.h"
#include "../defs.h"
#include <setjmp.h>
/*doc(Opcode)
Variable length opcodes. Sizes range from 1 to 5 bytes.
# Instruction formats
Instructions can be in 7 different formats:
1. 1 byte: Opcode(u8)
2. 2 bytes: Opcode(u8) + register(i8)
3. 3 bytes: Opcode(u8) + register(i8) + register(i8)
4. 3 bytes:\
4.1 Opcode(u8) + intermediate(u16)\
4.2 Opcode(u8) + data(u16)\
4.3 Opcode(u8) + offset(i16)\
4.4 Opcode(u8) + register(i8) + num_args(u8)
5. 4 bytes: Opcode(u8) + register(i8) + register(i8) + register(i8)
6. 4 bytes:\
6.1 Opcode(u8) + register(i8) + offset(i16)\
6.2 Opcode(u8) + register(i8) + intermediate(u16)\
6.3 Opcode(u8) + register(i8) + data(u16)\
6.4 Opcode(u8) + num_param_reg(u8) + num_local_var_reg(u16)
7. 5 bytes: Opcode(u8) + index(u16) + num_args(u8) + register(i8)
# Registers
Registers have a range of 128. Local variables start from register 0 and increment while parameters start from -1
and decrement.
*/
typedef enum {
AMAL_OP_NOP, /* No operation (do nothing). This can be used for patching code */
AMAL_OP_SETZ, /* setz reg - Set register value to 0 */
AMAL_OP_MOV, /* mov dst, src - Move src register to dst register */
AMAL_OP_MOVI, /* movi dst, src - Move src intermediate to dst register */
AMAL_OP_MOVD, /* movd dst, src - Move src data to dst register */
AMAL_OP_ADD, /* add dst, reg1, reg2 - Add reg1 and reg2 and put the result in dst */
AMAL_OP_SUB, /* sub dst, reg1, reg2 - Substract reg2 from reg1 and put the result in dst */
AMAL_OP_IMUL, /* imul dst, reg1, reg2 - Signed multiplication */
AMAL_OP_MUL, /* mul dst, reg1, reg2 - Unsigned multiplication */
AMAL_OP_IDIV, /* idiv dst, reg1, reg2 - Signed division */
AMAL_OP_DIV, /* div dst, reg1, reg2 - Unsigned division */
AMAL_OP_PUSH, /* push reg - Push register onto stack */
AMAL_OP_PUSHI, /* pushi int - Push intermediate onto stack */
AMAL_OP_PUSHD, /* pushd data - Push data onto stack */
AMAL_OP_CALL, /* call fi, num_args, dst - Call a function using function index (fi) and num_args arguments. The result is stored in register dst. fi is u16 and num_args is u8 */
AMAL_OP_CALLR, /* callr reg, num_args - Call a function using a register. Used for function pointers. num_args is u8 */
AMAL_OP_CALLE, /* calle efi, num_args, dst - Call an extern function using extern function index (efi) and num_args arguments. The result is stored in register dst. efi is u16 and num_args is u8 */
AMAL_OP_CMP, /* cmp dst, reg1, reg2 - Set dst to 1 if reg1 equals reg2, otherwise set it to 0 */
AMAL_OP_JZ, /* jz reg, offset - Jump to offset if reg is zero. offset is i16 */
AMAL_OP_JMP, /* jmp offset - Unconditional jump to offset. offset is i16 */
AMAL_OP_RET, /* ret reg - Return from the function with reg result */
AMAL_OP_FUNC_START, /* func_start num_param_reg, num_local_var_reg - Start of a function which has num_param_reg parameter registers allocated and num_local_var_reg local variable registers allocated. num_param_reg is u8 and num_local_var_reg is u16 */
AMAL_OP_FUNC_END /* func_end - End of a function. Implementation should do a ret here */
} AmalOpcode;
typedef u8 AmalOpcodeType;
typedef struct {
Buffer/*<headers + instruction data>*/ data;
} Bytecode;
typedef struct {
jmp_buf env;
Bytecode bytecode;
Parser *parser; /* borrowed */
} BytecodeCompilerContext;
CHECK_RESULT int bytecode_init(Bytecode *self, ArenaAllocator *allocator);
/* longjump to self->env on failure */
void generate_bytecode_from_ssa(BytecodeCompilerContext *self);
#endif
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