JVM
framestack.h
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1 #ifndef FRAMESTACK_H
2 #define FRAMESTACK_H
3 
4 typedef struct Frame Frame;
5 typedef struct FrameStack FrameStack;
6 
7 #include "operandstack.h"
8 #include "attributes.h"
9 
12 struct Frame
13 {
15  JavaClass* jc;
16 
19  uint8_t returnCount;
20 
23  uint32_t pc;
24 
26  uint32_t code_length;
27 
29  uint8_t* code;
30 
32  OperandStack* operands;
33 
35  int32_t* localVariables;
36 
37 #ifdef DEBUG
38  uint16_t max_locals;
39 #endif
40 };
41 
44 struct FrameStack
45 {
47  Frame* frame;
48 
50  struct FrameStack* next;
51 };
52 
53 Frame* newFrame(JavaClass* jc, method_info* method);
54 void freeFrame(Frame* frame);
55 uint8_t pushFrame(FrameStack** fs, Frame* frame);
56 uint8_t popFrame(FrameStack** fs, Frame* outPtr);
57 void freeFrameStack(FrameStack** fs);
58 
59 #endif // FRAMESTACK_H
Frame
Structure that will be associated with a method and holds the information necessary to run the method...
Definition: framestack.h:12
Frame::code_length
uint32_t code_length
Number of bytes the bytecode of the method contains.
Definition: framestack.h:26
Frame::returnCount
uint8_t returnCount
Number of operands that should be moved from this frame to the caller frame when the method returns...
Definition: framestack.h:19
freeFrameStack
void freeFrameStack(FrameStack **fs)
Free all the elements of the FrameStack passed as parameter by reference.
Definition: framestack.c:110
Frame::code
uint8_t * code
Bytecode of the method.
Definition: framestack.h:29
Frame::operands
OperandStack * operands
Stack of operands used by the method.
Definition: framestack.h:32
Frame::localVariables
int32_t * localVariables
Array of local variables used by the method.
Definition: framestack.h:35
popFrame
uint8_t popFrame(FrameStack **fs, Frame *outPtr)
Pop the Frame passed as parameter by reference.
Definition: framestack.c:91
FrameStack::next
struct FrameStack * next
Pointer to the next element of the stack.
Definition: framestack.h:50
pushFrame
uint8_t pushFrame(FrameStack **fs, Frame *frame)
Push the Frame into the FrameStack passed as parameter by reference.
Definition: framestack.c:71
JavaClass
Definition: javaclass.h:96
Frame::jc
JavaClass * jc
Class of the method associated with this frame.
Definition: framestack.h:15
FrameStack::frame
Frame * frame
The node value of the stack.
Definition: framestack.h:47
freeFrame
void freeFrame(Frame *frame)
Free the Frame passed as parameter.
Definition: framestack.c:54
OperandStack
Definition: operandstack.h:13
FrameStack
Stack of frames to store all frames created by method calling during execution of the JVM...
Definition: framestack.h:44
method_info
Definition: methods.h:10
Frame::pc
uint32_t pc
Index of the current bytecode being read from the method's instructions, Program Counter.
Definition: framestack.h:23
newFrame
Frame * newFrame(JavaClass *jc, method_info *method)
A new frame is created each time a method is invoked.
Definition: framestack.c:10