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dpavlin |
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#include <stdio.h> |
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#include <stdlib.h> |
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typedef int int32_t; |
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struct cpu; |
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struct instr_call { |
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void (*f)(struct cpu *cpu, struct instr_call *ic); |
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/* int instr_len; */ |
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void *arg[3]; |
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}; |
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struct cpu { |
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void *curpage; |
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int nloops; |
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struct instr_call *next_instr_call; |
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}; |
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void r(struct cpu *cpu) |
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{ |
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struct instr_call *ic; |
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for (;;) { |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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ic = cpu->next_instr_call++; |
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ic->f(cpu, ic); |
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} |
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} |
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void f_add(struct cpu *cpu, struct instr_call *ic) |
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{ |
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int32_t *a = (int32_t *) ic->arg[0]; |
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int32_t *b = (int32_t *) ic->arg[1]; |
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int32_t *c = (int32_t *) ic->arg[2]; |
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*a = (*b) + (*c); |
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} |
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void f_end(struct cpu *cpu, struct instr_call *ic) |
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{ |
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cpu->nloops--; |
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if (cpu->nloops > 0) { |
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cpu->next_instr_call = cpu->curpage; |
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return; |
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} |
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/* printf(" %i", cpu->nloops); fflush(stdout); */ |
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printf("Exiting correctly\n"); |
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exit(1); |
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} |
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int main(int argc, char *argv[]) |
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{ |
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int32_t tmp_a, tmp_b, tmp_c; |
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struct instr_call *call_array; |
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int i, ncalls; |
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struct cpu *cpu = malloc(sizeof(struct cpu)); |
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if (argc <= 1) { |
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fprintf(stderr, "usage: %s n\n", argv[0]); |
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exit(1); |
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} |
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cpu->nloops = atoi(argv[1]); |
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ncalls = 1024 + 1; |
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/* Fill a range of nonsense calls: */ |
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call_array = malloc(sizeof(struct instr_call) * ncalls); |
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cpu->curpage = call_array; |
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printf("ncalls = %i\n", ncalls); |
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for (i=0; i<ncalls; i++) { |
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if (i == ncalls-1) { |
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call_array[i].f = f_end; |
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} else { |
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call_array[i].f = f_add; |
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call_array[i].arg[0] = &tmp_a; |
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call_array[i].arg[1] = &tmp_b; |
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call_array[i].arg[2] = &tmp_c; |
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} |
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} |
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printf("running...\n"); |
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cpu->next_instr_call = &call_array[0]; |
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r(cpu); |
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printf("ERROR!\n"); |
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return 0; |
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} |
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