60 lines
1007 B
R
60 lines
1007 B
R
#include "Instruction.h"
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#include "defs.h"
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@implementation Instruction
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+ (id) opcode: (opcode_e) oc
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{
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return [[self alloc] initWithOpcode: oc operand: 0 label: nil];
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}
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+ (id) opcode: (opcode_e) oc operand: (int) op
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{
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return [[self alloc] initWithOpcode: oc operand: op label: nil];
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}
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+ (id) opcode: (opcode_e) oc label: (Instruction *) l
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{
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return [[self alloc] initWithOpcode: oc operand: 0 label: l];
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}
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- (id) initWithOpcode: (opcode_e) oc operand: (int) op label: (Instruction *) l
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{
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self = [super init];
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opcode = oc;
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operand = op;
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label = l;
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return self;
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}
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- (void) offset: (int) ofs
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{
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offset = ofs;
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}
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- (int) offset
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{
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return offset;
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}
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- (opcode_e) opcode
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{
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return opcode;
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}
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- (void) emitStruct: (instruction_t *) program
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{
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program[offset].opcode = opcode;
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if (label) {
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program[offset].operand = [label offset];
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} else {
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program[offset].operand = operand;
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}
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}
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- (void) markReachable
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{
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[label mark];
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}
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@end
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