62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
#ifndef FUN_VM_H
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#define FUN_VM_H
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#include "bytecode.h"
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#define VM_STACK_SIZE 1024
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#define VM_MAX_FRAMES 128
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#define VM_MAX_GLOBALS 128
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#define VM_OUTPUT_SIZE 1024
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#define FRAME_MAX_LOCALS 64
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static const char *opcode_names[] = {
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"NOP","LOAD_CONST","LOAD_LOCAL","STORE_LOCAL",
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"LOAD_GLOBAL","STORE_GLOBAL","ADD","SUB","MUL","DIV",
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"LT","LTE","GT","GTE","EQ","NEQ","POP","JUMP",
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"JUMP_IF_FALSE","CALL","RETURN","PRINT","HALT",
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"MOD","AND","OR","NOT","DUP","SWAP"
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};
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typedef struct {
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Bytecode *fn;
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int ip;
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Value locals[FRAME_MAX_LOCALS];
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} Frame;
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typedef struct {
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Value stack[VM_STACK_SIZE];
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int sp;
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Frame frames[VM_MAX_FRAMES];
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int fp; // frame pointer, -1 when no frame
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Value globals[VM_MAX_GLOBALS];
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Value output[VM_OUTPUT_SIZE]; // store printed values
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int output_count;
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long long instr_count; // executed instructions in the last vm_run
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} VM;
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// initialize VM (zero state)
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void vm_init(VM *vm);
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// helper function to clear the output
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void vm_clear_output(VM *vm);
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void vm_print_output(VM *vm);
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void vm_free(VM *vm);
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// reset VM to initial state (free globals/locals/output; keep VM object)
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void vm_reset(VM *vm);
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// print non-nil globals (index and value) to stdout
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void vm_dump_globals(VM *vm);
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// run entry Bytecode (pushes first frame)
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void vm_run(VM *vm, Bytecode *entry);
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static inline int opcode_is_valid(int op) {
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return op >= OP_NOP && op <= OP_SWAP; // all current opcodes
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}
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#endif
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