1  /*
 2   *  Bean Java VM
 3   *  Copyright (C) 2005-2015 Christian Lins <christian@lins.me>
 4   *
 5   *  Licensed under the Apache License, Version 2.0 (the "License");
 6   *  you may not use this file except in compliance with the License.
 7   *  You may obtain a copy of the License at
 8   *
 9   *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  #include <debug.h>
19  #include <stack.h>
20  #include <vm.h>
21  
22  void JSR(Thread *thread, uint32_t offset)
23  {
24      Varframe *frame =
25          (Varframe *) malloc(sizeof(Varframe));
26  
27      /* At the beginning of this function the thread->InstructionPointer
28         points to the last branchbyte, so we have to correct this... */
29      current_frame(thread)->instPtr++;
30  
31      /* Push the return address onto the stack */
32      frame->data.ptr = current_frame(thread)->instPtr + offset;
33      frame->type = JAVATYPE_RETADDR;     /* Return address */
34      Stack_push(&(current_frame(thread)->operandStack), frame);
35  }
36  
37  void do_JSR_W(Thread *thread)
38  {
39      uint32_t offset;
40      dbgmsg("JSR_W");
41  
42      offset = Get4ByteOperand(current_frame(thread));
43      JSR(thread, offset - 4);
44  }
45  
46  void do_JSR(Thread *thread)
47  {
48      uint16_t offset;
49      dbgmsg("JSR");
50  
51      offset = Get2ByteOperand(current_frame(thread));
52      JSR(thread, (uint32_t) offset - 2);
53  }