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50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
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#ifndef LAIKA_VM_H
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#define LAIKA_VM_H
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/* Laika VM:
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This is an obfuscation technique where vital code can be executed in a
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stack-based VM, inlined into the function. The VM instruction-set is fairly
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simple, see the OP_* for avaliable opcodes and their expected arguments.
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*/
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#define LAIKA_VM_CODESIZE 512
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#define LAIKA_VM_STACKSIZE 64
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#define LAIKA_VM_CONSTSIZE 32
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struct sLaika_vm_val {
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union {
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int i;
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void *ptr;
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};
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};
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struct sLaika_vm {
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struct sLaika_vm_val stack[LAIKA_VM_STACKSIZE];
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struct sLaika_vm_val constList[LAIKA_VM_CONSTSIZE];
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uint8_t code[LAIKA_VM_CODESIZE];
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int pc;
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};
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#define LAIKA_MAKE_VM_INT(i) (struct sLaika_vm_val)({.i = i})
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#define LAIKA_MAKE_VM_PTR(ptr) (struct sLaika_vm_val)({.ptr = ptr})
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#define LAIKA_MAKE_VM(consts, code) (struct sLaika_vm)({.constList = consts, .code = code, .pc = 0})
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enum {
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OP_EXIT,
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OP_LOADCONST, /* stk_indx[uint8_t] = const_indx[uint8_t] */
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OP_LOAD,
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/* arithmetic */
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OP_ADD, /* stk_indx[uint8_t] = stk_indx[uint8_t] + stk_indx[uint8_t] */
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OP_SUB, /* stk_indx[uint8_t] = stk_indx[uint8_t] - stk_indx[uint8_t] */
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OP_MUL, /* stk_indx[uint8_t] = stk_indx[uint8_t] * stk_indx[uint8_t] */
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OP_DIV, /* stk_indx[uint8_t] = stk_indx[uint8_t] / stk_indx[uint8_t] */
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OP_AND, /* stk_indx[uint8_t] = stk_indx[uint8_t] & stk_indx[uint8_t] */
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OP_OR, /* stk_indx[uint8_t] = stk_indx[uint8_t] | stk_indx[uint8_t] */
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OP_XOR, /* stk_indx[uint8_t] = stk_indx[uint8_t] ^ stk_indx[uint8_t] */
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/* control-flow */
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OP_TESTJMP, /* if stk_indx[uint8_t] != 0, pc = [uint8_t] */
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};
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#endif
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