1 //===-- llvm/CodeGen/MachineCodeForInstruction.h ----------------*- C++ -*-===//
3 // Representation of the sequence of machine instructions created for a single
4 // VM instruction. Additionally records information about hidden and implicit
5 // values used by the machine instructions: about hidden values used by the
6 // machine instructions:
8 // "Temporary values" are intermediate values used in the machine instruction
9 // sequence, but not in the VM instruction Note that such values should be
10 // treated as pure SSA values with no interpretation of their operands (i.e., as
11 // a TmpInstruction object which actually represents such a value).
13 // (2) "Implicit uses" are values used in the VM instruction but not in
14 // the machine instruction sequence
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_CODEGEN_MACHINECODE_FOR_INSTRUCTION_H
19 #define LLVM_CODEGEN_MACHINECODE_FOR_INSTRUCTION_H
21 #include "llvm/Annotation.h"
27 class MachineCodeForInstruction : public Annotation {
28 std::vector<Value*> tempVec; // used by m/c instr but not VM instr
29 std::vector<MachineInstr*> Contents;
31 MachineCodeForInstruction();
32 ~MachineCodeForInstruction();
34 static MachineCodeForInstruction &get(const Instruction *I);
35 static void destroy(const Instruction *I);
37 // Access to underlying machine instructions...
38 typedef std::vector<MachineInstr*>::iterator iterator;
39 typedef std::vector<MachineInstr*>::const_iterator const_iterator;
41 unsigned size() const { return Contents.size(); }
42 bool empty() const { return Contents.empty(); }
43 MachineInstr *front() const { return Contents.front(); }
44 MachineInstr *back() const { return Contents.back(); }
45 MachineInstr *&operator[](unsigned i) { return Contents[i]; }
46 MachineInstr *operator[](unsigned i) const { return Contents[i]; }
47 void pop_back() { Contents.pop_back(); }
49 iterator begin() { return Contents.begin(); }
50 iterator end() { return Contents.end(); }
51 const_iterator begin() const { return Contents.begin(); }
52 const_iterator end() const { return Contents.end(); }
55 void insert(iterator where, InIt first, InIt last) {
56 Contents.insert(where, first, last);
58 iterator erase(iterator where) { return Contents.erase(where); }
59 iterator erase(iterator s, iterator e) { return Contents.erase(s, e); }
62 // dropAllReferences() - This function drops all references within
63 // temporary (hidden) instructions created in implementing the original
64 // VM intruction. This ensures there are no remaining "uses" within
65 // these hidden instructions, before the values of a method are freed.
67 void dropAllReferences();
69 const std::vector<Value*> &getTempValues() const { return tempVec; }
70 std::vector<Value*> &getTempValues() { return tempVec; }
72 MachineCodeForInstruction &addTemp(Value *tmp) {
73 tempVec.push_back(tmp);