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      1 #include "sljitLir.h"
      2 
      3 #include <stdio.h>
      4 #include <stdlib.h>
      5 
      6 typedef long (*func3_t)(long a, long b, long c);
      7 
      8 static long SLJIT_CALL print_arr(long *a, long n)
      9 {
     10 	long i;
     11 	long sum = 0;
     12 	for (i = 0; i < n; ++i) {
     13 		sum += a[i];
     14 		printf("arr[%ld] = %ld\n", i, a[i]);
     15 	}
     16 	return sum;
     17 }
     18 
     19 /*
     20   This example, we generate a function like this:
     21 
     22 long func(long a, long b, long c)
     23 {
     24 	long arr[3] = { a, b, c };
     25 	return print_arr(arr, 3);
     26 }
     27 */
     28 
     29 static int temp_var(long a, long b, long c)
     30 {
     31 	void *code;
     32 	unsigned long len;
     33 	func3_t func;
     34 
     35 	/* Create a SLJIT compiler */
     36 	struct sljit_compiler *C = sljit_create_compiler();
     37 
     38 	/* reserved space in stack for long arr[3] */
     39 	sljit_emit_enter(C, 0,  3,  2, 3, 0, 0, 3 * sizeof(long));
     40 	/*                  opt arg R  S  FR FS local_size */
     41 
     42 	/* arr[0] = S0, SLJIT_SP is the init address of local var */
     43 	sljit_emit_op1(C, SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), 0, SLJIT_S0, 0);
     44 	/* arr[1] = S1 */
     45 	sljit_emit_op1(C, SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), 1 * sizeof(long), SLJIT_S1, 0);
     46 	/* arr[2] = S2 */
     47 	sljit_emit_op1(C, SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), 2 * sizeof(long), SLJIT_S2, 0);
     48 
     49 	/* R0 = arr; in fact SLJIT_SP is the address of arr, but can't do so in SLJIT */
     50 	sljit_get_local_base(C, SLJIT_R0, 0, 0);	/* get the address of local variables */
     51 	sljit_emit_op1(C, SLJIT_MOV, SLJIT_R1, 0, SLJIT_IMM, 3);	/* R1 = 3; */
     52 	sljit_emit_ijump(C, SLJIT_CALL2, SLJIT_IMM, SLJIT_FUNC_OFFSET(print_arr));
     53 	sljit_emit_return(C, SLJIT_MOV, SLJIT_R0, 0);
     54 
     55 	/* Generate machine code */
     56 	code = sljit_generate_code(C);
     57 	len = sljit_get_generated_code_size(C);
     58 
     59 	/* Execute code */
     60 	func = (func3_t)code;
     61 	printf("func return %ld\n", func(a, b, c));
     62 
     63 	/* dump_code(code, len); */
     64 
     65 	/* Clean up */
     66 	sljit_free_compiler(C);
     67 	sljit_free_code(code);
     68 	return 0;
     69 }
     70 
     71 int main()
     72 {
     73 	return temp_var(7, 8, 9);
     74 }
     75