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jvm.c
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#include "jvm.h"
operation optable[N_OPS] = {
[OP_nop] = nop,
[OP_ldc] = ldc,
[OP_istore] = istore,
[OP_istore_0] = istore_0,
[OP_istore_1] = istore_1,
[OP_istore_2] = istore_2,
[OP_istore_3] = istore_3,
[OP_iload] = iload,
[OP_iload_0] = iload_0,
[OP_iload_1] = iload_1,
[OP_iload_2] = iload_2,
[OP_iload_3] = iload_3,
[OP_iadd] = iadd,
[OP_isub] = isub,
[OP_imul] = imul,
[OP_idiv] = idiv,
[OP_ishl] = ishl,
[OP_ishr] = ishr,
[OP_iushr] = iushr,
[OP_iand] = iand,
[OP_ior] = ior,
[OP_irem] = irem,
[OP_ineg] = ineg,
[OP_return] = return_func,
[OP_ireturn] = ireturn,
[OP_dreturn] = dreturn,
[OP_lreturn] = lreturn,
[OP_freturn] = freturn,
[OP_invokevirtual] = invokevirtual,
[OP_invokestatic] = invokestatic,
[OP_invokespecial] = invokespecial,
[OP_getstatic] = getstatic,
[OP_putstatic] = putstatic,
[OP_ldc_w] = ldc_w,
[OP_ldc2_w] = ldc2_w,
[OP_dstore] = dstore,
[OP_dstore_0] = dstore_0,
[OP_dstore_1] = dstore_1,
[OP_dstore_2] = dstore_2,
[OP_dstore_3] = dstore_3,
[OP_dload] = dload,
[OP_dload_0] = dload_0,
[OP_dload_1] = dload_1,
[OP_dload_2] = dload_2,
[OP_dload_3] = dload_3,
[OP_dadd] = dadd,
[OP_dsub] = dsub,
[OP_dmul] = dmul,
[OP_ddiv] = ddiv,
[OP_dneg] = dneg,
[OP_drem] = drem,
[OP_bipush] = bipush,
[OP_iconst_0] = iconst_0,
[OP_iconst_1] = iconst_1,
[OP_iconst_2] = iconst_2,
[OP_iconst_3] = iconst_3,
[OP_iconst_m1] = iconst_m1,
[OP_iconst_4] = iconst_4,
[OP_iconst_5] = iconst_5,
[OP_if_icmpeq] = if_icmpeq,
[OP_if_icmpne] = if_icmpne,
[OP_if_icmplt] = if_icmplt,
[OP_if_icmpge] = if_icmpge,
[OP_if_icmpgt] = if_icmpgt,
[OP_if_icmple] = if_icmple,
[OP_ifnull] = ifnull,
[OP_ifnonnull] = ifnonnull,
[OP_lconst_0] = lconst_0,
[OP_lconst_1] = lconst_1,
[OP_lstore] = lstore,
[OP_lstore_0] = lstore_0,
[OP_lstore_1] = lstore_1,
[OP_lstore_2] = lstore_2,
[OP_lstore_3] = lstore_3,
[OP_lload] = lload,
[OP_lload_0] = lload_0,
[OP_lload_1] = lload_1,
[OP_lload_2] = lload_2,
[OP_lload_3] = lload_3,
[OP_ladd] = ladd,
[OP_lsub] = lsub,
[OP_lmul] = lmul,
[OP_ldiv] = ldiv_,
[OP_iinc] = iinc,
[OP_goto] = goto_func,
[OP_fconst_0] = fconst_0,
[OP_fconst_1] = fconst_1,
[OP_fconst_2] = fconst_2,
[OP_fstore] = fstore,
[OP_fstore_0] = fstore_0,
[OP_fstore_1] = fstore_1,
[OP_fstore_2] = fstore_2,
[OP_fstore_3] = fstore_3,
[OP_fload] = fload,
[OP_fload_0] = fload_0,
[OP_fload_1] = fload_1,
[OP_fload_2] = fload_2,
[OP_fload_3] = fload_3,
[OP_fsub] = fsub,
[OP_fadd] = fadd,
[OP_fdiv] = fdiv,
[OP_fmul] = fmul,
[OP_frem] = frem,
[OP_fneg] = fneg,
[OP_ifeq] = ifeq,
[OP_ifne] = ifne,
[OP_iflt] = iflt,
[OP_ifge] = ifge,
[OP_ifgt] = ifgt,
[OP_ifle] = ifle,
[OP_i2f] = i2f,
[OP_i2d] = i2d,
[OP_i2b] = i2b,
[OP_i2c] = i2c,
[OP_i2l] = i2l,
[OP_i2s] = i2s,
[OP_sipush] = sipush,
[OP_aconst_null] = aconst_null,
[OP_aload] = aload,
[OP_aload_0] = aload_0,
[OP_aload_1] = aload_1,
[OP_aload_2] = aload_2,
[OP_aload_3] = aload_3,
[OP_astore] = astore,
[OP_astore_0] = astore_0,
[OP_astore_1] = astore_1,
[OP_astore_2] = astore_2,
[OP_astore_3] = astore_3,
[OP_newarray] = newarray,
[OP_aastore] = aastore,
[OP_aaload] = aaload,
[OP_iastore] = iastore,
[OP_iaload] = iaload,
[OP_fastore] = fastore,
[OP_faload] = faload,
[OP_lastore] = lastore,
[OP_laload] = laload,
[OP_dastore] = dastore,
[OP_daload] = daload,
[OP_bastore] = bastore,
[OP_baload] = baload,
[OP_d2f] = d2f,
[OP_d2i] = d2i,
[OP_d2l] = d2l,
[OP_f2d] = f2d,
[OP_f2i] = f2i,
[OP_f2l] = f2l,
[OP_l2d] = l2d,
[OP_l2f] = l2f,
[OP_l2i] = l2i,
[OP_multianewarray] = multianewarray,
[OP_anewarray] = anewarray,
[OP_dup] = dup,
[OP_new] = new,
[OP_getfield] = getfield,
[OP_putfield] = putfield,
[OP_athrow] = athrow
};
void init_jvm(JVM *jvm) {
jvm->pc = 0;
jvm->frame_index = 0;
jvm->method_area = calloc(sizeof(MethodArea), 1);
init_method_area(jvm->method_area);
jvm->current_class_index = -1;
jvm->current_method_index = -1;
jvm->jmp = false;
jvm->ret = false;
jvm->heap_index = -1;
jvm->static_index = -1;
}
void deinit_jvm(JVM *jvm) {
deinit_method_area(jvm->method_area);
free(jvm->method_area);
while (jvm_peek_frame(jvm)) {
jvm_pop_frame(jvm);
}
while (jvm->heap_index >= 0) {
free(jvm->heap[(jvm->heap_index)--]);
}
while (jvm->static_index >= 0) {
free(jvm->statics[(jvm->static_index)--]);
}
}
void jvm_load_classfile(JVM *jvm, classfile *cf) {
method_area_load_classfile(jvm->method_area, cf);
}
void jvm_load_class(JVM *jvm, char *class_name) {
method_area_load_class(jvm->method_area, class_name);
}
void jvm_set_current_class(JVM *jvm, char *class_name) {
int index = method_area_class_lookup(jvm->method_area, class_name);
jvm->current_class_index = index;
}
void jvm_set_current_method(JVM *jvm, char *method_name) {
classfile *class = jvm_get_current_class(jvm);
int i;
for (i = 0; i < class->methods_count; i++) {
method_info *method = &class->methods[i];
char *curr_method_name = get_cp_string(class->constant_pool, method->name_index);
if (strcmp(curr_method_name, method_name) == 0) {
jvm->current_method_index = i;
return;
}
}
}
void jvm_exec_clinit(JVM *jvm) {
classfile *class = jvm_get_current_class(jvm);
int flag = 0;
int i;
for (i = 0; i < class->methods_count; i++) {
method_info *method = &class->methods[i];
char *curr_method_name = get_cp_string(class->constant_pool, method->name_index);
if (strcmp(curr_method_name, "<clinit>") == 0) {
flag = 1;
jvm->current_method_index = i;
}
}
if (flag) {
jvm_push_frame(jvm);
jvm_run(jvm);
}
}
void jvm_load_method(JVM *jvm, uint32_t class_index, uint32_t method_index) {
jvm->current_class_index = class_index;
jvm->current_method_index = method_index;
}
classfile *jvm_get_current_class(JVM *jvm) {
classfile *class = jvm->method_area->classes[jvm->current_class_index];
return class;
}
char *jvm_get_current_class_name(JVM *jvm) {
Frame *f = jvm_peek_frame(jvm);
classfile *class = jvm_get_current_class(jvm);
CONSTANT_Class_info class_info = f->cp[class->this_class].info.class_info;
return get_cp_string(f->cp, class_info.name_index);
}
method_info *jvm_get_current_method(JVM *jvm) {
classfile *class = jvm_get_current_class(jvm);
method_info *method = &class->methods[jvm->current_method_index];
return method;
}
char *jvm_get_current_method_name(JVM *jvm) {
Frame *f = jvm_peek_frame(jvm);
method_info *method = jvm_get_current_method(jvm);
char *str = get_cp_string(f->cp, method->name_index);
return str;
}
void jvm_push_frame(JVM *jvm) {
classfile *class = jvm_get_current_class(jvm);
method_info *method = jvm_get_current_method(jvm);
Code_attribute *code = &method->attributes[0].info.code;
Frame *f = calloc(sizeof(Frame), 1);
init_frame(f, jvm, code->max_locals, code->max_stack, class->constant_pool,
jvm->current_class_index, jvm->current_method_index);
jvm->frames[jvm->frame_index++] = f;
jvm->pc = 0;
}
void jvm_pop_frame(JVM *jvm) {
Frame *f = jvm->frames[--jvm->frame_index];
deinit_frame(f);
free(f);
}
Frame *jvm_peek_frame(JVM *jvm) {
if (jvm->frame_index == 0) return NULL;
return jvm->frames[jvm->frame_index-1];
}
int jvm_cycle(JVM *jvm) {
int flag = 1; /* will be set to 0 if returns from main in this cycle */
Frame *f = jvm_peek_frame(jvm);
method_info *method = jvm_get_current_method(jvm);
Code_attribute *code = &method->attributes[0].info.code;
uint32_t opcode = code->code[jvm->pc];
jvm->jmp = false;
#ifdef DEBUG
printf("%d: 0x%x (%d)\n", jvm->pc, opcode, opargs[opcode]);
#endif
if (opcode == OP_tableswitch) {
return tableswitch(jvm);
}
uint32_t a[3];
int i;
for (i = 0; i < opargs[opcode]; i++) {
a[i] = code->code[jvm->pc+i+1];
#ifdef DEBUG
printf("load a%d: %d\n", i, a[i]);
#endif
}
if (opcode == OP_multianewarray) {
uint32_t index = (a[0] << 8) | a[1];
multianewarray(f, index, a[2]);
} else {
optable[opcode](f, a[0], a[1]);
}
if (opcode == OP_return && jvm_in_main(jvm)) {
#ifdef DEBUG
printf("frame->i: %d\n", f->i);
if (f->i > 0) printf("Final value in stack: %d (0x%x)\n", peek_stack(f), peek_stack(f));
#endif
flag = 0;
} else if (opcode == OP_return && jvm_in_clinit(jvm)) {
#ifdef DEBUG
printf("Return from '%s' <clinit>\n", jvm_get_current_class(jvm));
#endif
flag = 0;
}
if (jvm->ret && !jvm_in_main(jvm) && !jvm_in_clinit(jvm)) {
/* free called method's frame */
jvm_pop_frame(jvm);
jvm_restore_context(jvm);
Frame *f = jvm_peek_frame(jvm);
/* Push return value to callee's operand stack */
if (opcode == OP_dreturn) {
double d = *((double *) (&jvm->retval));
push_stack_double(f, d);
} else if (opcode == OP_lreturn) {
int64_t l = *((int64_t *) (&jvm->retval));
push_stack_long(f, l);
} else if (opcode != OP_return) {
push_stack(f, jvm->retval);
}
/* reset return flag */
jvm->ret = false;
}
if (!jvm->jmp && opcode != OP_invokestatic
&& opcode != OP_invokespecial) {
jvm->pc += opargs[opcode] + 1;
}
return flag;
}
void jvm_run(JVM *jvm) {
while (jvm_cycle(jvm));
}
void jvm_run_method(JVM *jvm) {
classfile *class = jvm->method_area->classes[jvm->current_class_index];
method_info *method = &class->methods[jvm->current_method_index];
Code_attribute *code = &method->attributes[0].info.code;
Frame *f = calloc(sizeof(Frame), 1);
init_frame(f, jvm, code->max_locals, code->max_stack, class->constant_pool, jvm->current_class_index,
jvm->current_method_index);
#ifdef DEBUG
printf("Current class: %s\n", get_class_name(jvm->method_area->classes[0]));
printf("Current method: %s\n", get_cp_string(class->constant_pool, method->name_index));
printf("Current method descriptor: %s\n", get_cp_string(class->constant_pool, method->descriptor_index));
printf("Max locals:%d\nMax stack: %d\n", code->max_locals, code->max_stack);
#endif
while (1) {
uint32_t opcode = code->code[jvm->pc];
#ifdef DEBUG
printf("%d: 0x%x (%d)\n", jvm->pc, opcode, opargs[opcode]);
#endif
uint8_t a[2];
int i;
for (i = 0; i < opargs[opcode]; i++) {
a[i] = code->code[jvm->pc+i+1];
#ifdef DEBUG
printf("load a%d: %d\n", i, a[i]);
#endif
}
optable[opcode](f, a[0], a[1]);
if (opcode == OP_return) {
#ifdef DEBUG
printf("frame->i: %d\n", f->i);
if (f->i > 0) printf("Final value in stack: %d (0x%x)\n", peek_stack(f), peek_stack(f));
#endif
break;
}
jvm->pc += opargs[opcode] + 1;
}
deinit_frame(f);
free(f);
}
int jvm_in_main(JVM *jvm) {
char *str = jvm_get_current_method_name(jvm);
return strcmp(str, "main") == 0;
}
bool jvm_in_clinit(JVM *jvm) {
char *str = jvm_get_current_method_name(jvm);
return strcmp(str, "<clinit>") == 0;
}
void jvm_save_context(JVM *jvm) {
Frame *f = jvm_peek_frame(jvm);
f->pc = jvm->pc + 2;
f->class_index = jvm->current_class_index;
f->method_index = jvm->current_method_index;
}
void jvm_restore_context(JVM *jvm) {
Frame *f = jvm_peek_frame(jvm);
jvm->pc = f->pc;
jvm->current_class_index = f->class_index;
jvm->current_method_index = f->method_index;
}
void jvm_add_to_heap(JVM *jvm, void *ptr) {
jvm->heap[++(jvm->heap_index)] = ptr;
}
void nop(Frame *f, uint32_t a0, uint32_t a1) {
/* do nothing */
return;
}
void ldc(Frame *f, uint32_t a0, uint32_t a1) {
uint16_t index;
char *str;
/* push item from runtime constant pool */
uint8_t tag = f->cp[a0].tag;
switch (tag) {
case CONSTANT_Integer:
#ifdef DEBUG
printf("Push %d from cp\n", f->cp[a0].info.integer_info.bytes);
#endif
push_stack(f, f->cp[a0].info.integer_info.bytes);
break;
case CONSTANT_Float:
#ifdef DEBUG
printf("Push %f from cp\n", f->cp[a0].info.float_info.bytes);
#endif
push_stack(f, f->cp[a0].info.float_info.bytes);
break;
case CONSTANT_String:
index = f->cp[a0].info.string_info.string_index;
str = get_cp_string(f->cp, index);
#ifdef DEBUG
printf("Push \'%s\' from cp\n", str);
#endif
push_stack_pointer(f, str);
default:
break;
}
}
void istore(Frame *f, uint32_t a0, uint32_t a1) {
/* store int into local variable a0 */
int32_t op = pop_stack(f);
frame_set_local_int(f, a0, op);
}
void istore_0(Frame *f, uint32_t a0, uint32_t a1) {
/* store int into local variable 0 */
istore(f, 0, 0);
}
void istore_1(Frame *f, uint32_t a0, uint32_t a1) {
/* store int into local variable 1 */
istore(f, 1, 0);
}
void istore_2(Frame *f, uint32_t a0, uint32_t a1) {
/* store int into local variable 2 */
istore(f, 2, 0);
}
void istore_3(Frame *f, uint32_t a0, uint32_t a1) {
/* store int into local variable 3 */
istore(f, 3, 0);
}
void iload(Frame *f, uint32_t a0, uint32_t a1) {
/* Load int from local variable a0 */
int32_t op = frame_get_local_int(f, a0);
push_stack(f, op);
}
void iload_0(Frame *f, uint32_t a0, uint32_t a1) {
/* Load int from local variable 0 */
iload(f, 0, 0);
}
void iload_1(Frame *f, uint32_t a0, uint32_t a1) {
/* Load int from local variable 1 */
iload(f, 1, 0);
}
void iload_2(Frame *f, uint32_t a0, uint32_t a1) {
/* Load int from local variable 2 */
iload(f, 2, 0);
}
void iload_3(Frame *f, uint32_t a0, uint32_t a1) {
/* Load int from local variable 3 */
iload(f, 3, 0);
}
void iadd(Frame *f, uint32_t a0, uint32_t a1) {
push_stack(f, pop_stack(f) + pop_stack(f));
}
void isub(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
push_stack(f, v2 - v1);
}
void imul(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
push_stack(f, v1 * v2);
}
void idiv(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
if (v1 == 0) {
printf("ArithmeticException: Can't be divided by Zero\n");
exit(1);
}
push_stack(f, v2/v1);
}
void iand(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
push_stack(f, (v2) & (v1) );
}
void ior(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
push_stack(f, (v2) | (v1));
}
void ineg(Frame *f, uint32_t a0, uint32_t a1) {
int32_t d1 = pop_stack(f);
int32_t result = -d1;
push_stack(f, result);
}
void irem(Frame *f, uint32_t a0, uint32_t a1) {
int32_t d1 = pop_stack(f);
int32_t d2 = pop_stack(f);
int q = d2/d1;
int32_t result = d2 - (d1 * q);
push_stack(f, result);
}
void ishr(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
int32_t result_ishr = (v2 >> (v1 & 0x1F));
push_stack(f, result_ishr);
}
void ishl(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
int32_t result_ishl = (v2 << (v1 & 0x1F));
push_stack(f, result_ishl);
}
void iushr(Frame *f, uint32_t a0, uint32_t a1) {
int32_t v1 = pop_stack(f);
int32_t v2 = pop_stack(f);
int32_t result_ishr = (v2 >> (v1 & 0x1F)) + (2 << ~(v1 & 0x1F));
push_stack(f, result_ishr);
}
void return_func(Frame *f, uint32_t a0, uint32_t a1) {
#ifdef DEBUG
printf("return\n");
#endif
JVM *jvm = f->jvm;
if (!jvm_in_main(jvm)) {
jvm->ret = true;
}
}
void ireturn(Frame *f, uint32_t a0, uint32_t a1) {
/* get value to be returned */
int32_t retval = pop_stack_int(f);
JVM *jvm = f->jvm;
jvm->ret = true;
jvm->retval = *((uint64_t *) (&retval));
#ifdef DEBUG
printf("ireturn (%d 0x%x)\n", retval, retval);
#endif
}
void dreturn(Frame *f, uint32_t a0, uint32_t a1) {
/* get value to be returned */
double retval = pop_stack_double(f);
JVM *jvm = f->jvm;
jvm->ret = true;
jvm->retval = *((uint64_t *) (&retval));
#ifdef DEBUG
printf("dreturn (%f 0x%x)\n", retval, retval);
#endif
}
void lreturn(Frame *f, uint32_t a0, uint32_t a1) {
/* get value to be returned */
int64_t retval = pop_stack_long(f);
JVM *jvm = f->jvm;
jvm->ret = true;
jvm->retval = *((uint64_t *) (&retval));
#ifdef DEBUG
printf("lreturn (%ld 0x%x)\n", retval, retval);
#endif
}
void freturn(Frame *f, uint32_t a0, uint32_t a1) {
/* get value to be returned */
float retval = pop_stack_float(f);
JVM *jvm = f->jvm;
jvm->ret = true;
jvm->retval = *((uint64_t *) (&retval));
#ifdef DEBUG
printf("freturn (%f 0x%x)\n", retval, retval);
#endif
}
void invokevirtual(Frame *f, uint32_t a0, uint32_t a1) {
uint32_t index = (a0 << 8) | a1;
CONSTANT_Methodref_info methodref_info = f->cp[index].info.methodref_info;
uint16_t class_index = methodref_info.class_index;
uint16_t name_and_type_index = methodref_info.name_and_type_index;
char *name = get_name_and_type_string(f->cp, name_and_type_index, 1);
char *type = get_name_and_type_string(f->cp, name_and_type_index, 0);
#ifdef DEBUG
printf("invokevirtual: Methodref\t");
printf("class: %s, name: %s, type: %s\n", get_class_name_string(f->cp, class_index),
name, type);
#endif
if (strcmp(name, "println") == 0) {
if (strcmp(type, "(Ljava/lang/String;)V") == 0) {
/* print string */
char *str = pop_stack_pointer(f);
#ifdef DEBUG
printf("println(String): \'%s\'\n", str);
#else
printf("%s\n", str);
#endif
} else if (strcmp(type, "(I)V") == 0) {
/* print int */
uint64_t value = pop_stack(f);
int32_t integer = *((int32_t *) (&value));
#ifdef DEBUG
printf("println(Int): %d\n", integer);
#else
printf("%d\n", integer);
#endif
} else if (strcmp(type, "(D)V") == 0) {
/* print double */
double db = pop_stack_double(f);
#ifdef DEBUG
printf("println(double): %f\n", db);
#else
printf("%f\n", db);
#endif
} else if (strcmp(type, "(J)V") == 0) {
/* print long */
int64_t x = pop_stack_long(f);
#ifdef DEBUG
printf("println(long): %ld\n", x);
#else
printf("%ld\n", x);
#endif
} else if (strcmp(type, "(F)V") == 0) {
/* print float */
float x = pop_stack_float(f);
#ifdef DEBUG
printf("println(float): %f\n", x);
#else
printf("%f\n", x);
#endif
} else if (strcmp(type, "(C)V") == 0) {
/* print char */
uint16_t ch = pop_stack(f);
#ifdef DEBUG
printf("println(char): %c\n", ch);
#else
printf("%c\n", ch);
#endif
} else if (strcmp(type, "(Z)V") == 0) {
/* print bool */
int32_t boolean = pop_stack_int(f);
#ifdef DEBUG
printf("println(bool): %d\n", boolean);
#else
if (boolean) {
printf("true\n");
} else {
printf("false\n");
}
#endif
}
/* pop getstatic dummy value (view getstatic definition) */
uint32_t dummy = pop_stack(f);
#ifdef DEBUG
printf("dummy: 0x%x\n", dummy);
#endif
} else if (strcmp(name, "print") == 0) {
if (strcmp(type, "(Ljava/lang/String;)V") == 0) {
/* print string */
char *str = pop_stack_pointer(f);
#ifdef DEBUG
printf("print(String): \'%s\'\n", str);
#else
printf("%s", str);
#endif
} else if (strcmp(type, "(I)V") == 0) {
/* print int */
uint64_t value = pop_stack(f);
int32_t integer = *((int32_t *) (&value));
#ifdef DEBUG
printf("print(Int): %d\n", integer);
#else
printf("%d", integer);
#endif
} else if (strcmp(type, "(D)V") == 0) {
/* print double */
double db = pop_stack_double(f);
#ifdef DEBUG
printf("print(double): %f\n", db);
#else
printf("%f", db);
#endif
} else if (strcmp(type, "(J)V") == 0) {
/* print long */
int64_t x = pop_stack_long(f);
#ifdef DEBUG
printf("print(long): %ld\n", x);
#else
printf("%ld", x);
#endif
} else if (strcmp(type, "(F)V") == 0) {
/* print float */
float x = pop_stack_float(f);
#ifdef DEBUG
printf("print(float): %f\n", x);
#else
printf("%f", x);
#endif
} else if (strcmp(type, "(C)V") == 0) {
/* print char */
uint16_t ch = pop_stack(f);
#ifdef DEBUG
printf("print(char): %c\n", ch);
#else
printf("%c", ch);
#endif
} else if (strcmp(type, "(Z)V") == 0) {
/* print bool */
int32_t boolean = pop_stack_int(f);
#ifdef DEBUG
printf("print(bool): %d\n", boolean);
#else
if (boolean) {
printf("true");
} else {
printf("false");
}
#endif
}
/* pop getstatic dummy value (view getstatic definition) */
uint32_t dummy = pop_stack(f);
#ifdef DEBUG
printf("dummy: 0x%x\n", dummy);
#endif
}
return;
}
void invokestatic(Frame *f, uint32_t a0, uint32_t a1) {
uint32_t index = (a0 << 8) | a1;
CONSTANT_Methodref_info methodref_info = f->cp[index].info.methodref_info;
uint16_t class_index = methodref_info.class_index;
char *class_name = get_class_name_string(f->cp, class_index);
uint16_t name_and_type_index = methodref_info.name_and_type_index;
char *method_name = get_name_and_type_string(f->cp, name_and_type_index, 1);
char *type = get_name_and_type_string(f->cp, name_and_type_index, 0);
#ifdef DEBUG
printf("invokestatic: Methodref\t");
printf("class: %s, name: %s, type: %s\n", class_name,
method_name, type);
#endif
JVM *jvm = f->jvm;
jvm_save_context(jvm);
jvm_load_class(jvm, class_name);
jvm_set_current_class(jvm, class_name);
jvm_set_current_method(jvm, method_name);
jvm_push_frame(jvm);
jvm_set_args(jvm, f, type);
}
void jvm_parse_types(char *type, char parsed[], int *count) {
char buf[BUFSIZE];
int i = 1;
int j = 0;
int k = 0;
while (type[i] != ')') {
switch (type[i]) {
case 'I':
parsed[j] = 'I';
break;
case 'J':
parsed[j] = 'J';
break;
case 'F':
parsed[j] = 'F';
break;
case 'D':
parsed[j] = 'D';
break;
default:
while (type[i] != ';') buf[k++] = type[i++];
buf[k] = 0;
if (strcmp(buf, "Ljava/lang/String;")) {
parsed[j] = 'A';
} else {
#ifdef DEBUG
printf("jvm_set_args: Unknown arg type %s\n", buf);
#endif
}
break;
}
j++;
i++;
}
*count = j;
}
void jvm_set_args(JVM *jvm, Frame *caller, char *type) {
Frame *f1 = jvm_peek_frame(jvm);
int32_t intarg;
int64_t longarg;
float floatarg;
double doublearg;
void *ptrarg;
char parsed[BUFSIZE] = {0};
int count = 0;
jvm_parse_types(type, parsed, &count);
#ifdef DEBUG
printf("jvm_set_args: parsed types: %s\n", parsed);
#endif
int i, j;
/* compute last arg's position in locals array (j) */
for (i = j = 0; i < count; i++) {
switch (parsed[i]) {
case 'D':
case 'J':
j++;
default:
j++;
break;
}
}
j-=1;
/* loop backwards over args to pop in correct order */
for (i = count-1; i >= 0; i--, j--) {
switch (parsed[i]) {
case 'I':
intarg = pop_stack_int(caller);
frame_set_local_int(f1, j, intarg);
break;
case 'J':
longarg = pop_stack_long(caller);
frame_set_local_long(f1, --j, longarg);
break;
case 'F':
floatarg = pop_stack_float(caller);
frame_set_local_float(f1, j, floatarg);
break;
case 'D':
doublearg = pop_stack_double(caller);
printf("Placing arg %f in local %d\n", doublearg, j-1);
frame_set_local_double(f1, --j, doublearg);
break;
case 'A':
ptrarg = pop_stack_pointer(caller);
frame_set_local_pointer(f1, j, ptrarg);
break;
default:
#ifdef DEBUG
printf("jvm_set_args: Unknown type %c\n", parsed[i]);
#endif
break;
}
}
}
void invokespecial(Frame *f, uint32_t a0, uint32_t a1) {
uint32_t index = (a0 << 8) | a1;
CONSTANT_Methodref_info methodref_info = f->cp[index].info.methodref_info;
uint16_t class_index = methodref_info.class_index;
char *class_name = get_class_name_string(f->cp, class_index);
uint16_t name_and_type_index = methodref_info.name_and_type_index;
char *method_name = get_name_and_type_string(f->cp, name_and_type_index, 1);
char *type = get_name_and_type_string(f->cp, name_and_type_index, 0);
#ifdef DEBUG
printf("invokespecial: Methodref\t");
printf("class: %s, name: %s, type: %s\n", class_name,
method_name, type);
#endif
if (strcmp(class_name, "java/lang/Object") == 0) {
/* ignore base object init */
JVM *jvm = f->jvm;
pop_stack_pointer(f);
jvm->pc += opargs[OP_invokespecial] + 1;
} else if (strcmp(method_name, "<init>") == 0) {
JVM *jvm = f->jvm;
jvm_save_context(jvm);
jvm_load_class(jvm, class_name);
jvm_set_current_class(jvm, class_name);
jvm_set_current_method(jvm, method_name);
jvm_push_frame(jvm);
void *ref = pop_stack_pointer(f);
frame_set_local_pointer(jvm_peek_frame(jvm), 0, ref);
}
}
void getstatic(Frame *f, uint32_t a0, uint32_t a1) {
uint32_t index = (a0 << 8) | a1;
JVM *jvm = f->jvm;
CONSTANT_Fieldref_info fieldref_info = f->cp[index].info.fieldref_info;
uint16_t class_index = fieldref_info.class_index;
uint16_t name_and_type_index = fieldref_info.name_and_type_index;
char *classname = get_class_name_string(f->cp, class_index);
char *name = get_name_and_type_string(f->cp, name_and_type_index, 1);
char *type = get_name_and_type_string(f->cp, name_and_type_index, 0);
#ifdef DEBUG
printf("getstatic: classname=%s, name=%s, type=%s\n", classname, name, type);
#endif
if ((strcmp(classname, "java/lang/System") == 0)
&& (strcmp(name, "out") == 0)) {
/* io operations will be handled by c code */
/* push a dummy value onto the stack */
push_stack(f, 0xcc0de);
} else {
Static *st = jvm_get_static(jvm, classname, name);
assert(st);