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24 
25 #ifndef CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
26 #define CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
27 
28 //  Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
29 //  FPU registers are described as numbers from 0..nof_fpu_regs-1
30 
31 class Compilation;
32 
33 class FpuStackSim {
34  private:
35   Compilation* _compilation;
36   int          _stack_size;
37   int          _regs[FrameMap::nof_fpu_regs];
38 
tos_index() const39   int tos_index() const                        { return _stack_size - 1; }
40 
41   int regs_at(int i) const;
42   void set_regs_at(int i, int val);
43   void dec_stack_size();
44   void inc_stack_size();
45 
46   // unified bailout support
compilation() const47   Compilation*  compilation() const              { return _compilation; }
bailout(const char * msg) const48   void          bailout(const char* msg) const   { compilation()->bailout(msg); }
bailed_out() const49   bool          bailed_out() const               { return compilation()->bailed_out(); }
50 
51  public:
52   FpuStackSim(Compilation* compilation);
53   void pop ();
54   void pop (int rnr);                          // rnr must be on tos
55   void push(int rnr);
56   void swap(int offset);                       // exchange tos with tos + offset
57   int offset_from_tos(int rnr) const;          // return the offset of the topmost instance of rnr from TOS
58   int  get_slot(int tos_offset) const;         // return the entry at the given offset from TOS
59   void set_slot(int tos_offset, int rnr);      // set the entry at the given offset from TOS
60   void rename(int old_rnr, int new_rnr);       // rename all instances of old_rnr to new_rnr
61   bool contains(int rnr);                      // debugging support only
62   bool is_empty();
63   bool slot_is_empty(int tos_offset);
stack_size() const64   int stack_size() const                       { return _stack_size; }
65   void clear();
66   intArray* write_state();
67   void read_state(intArray* fpu_stack_state);
68 
69   void print() PRODUCT_RETURN;
70 };
71 
72 #endif // CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
73