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 extern AnnotationID MCFI_AID;
29 class MachineCodeForInstruction : public Annotation {
30 std::vector<Value*> tempVec; // used by m/c instr but not VM instr
31 std::vector<MachineInstr*> Contents;
33 MachineCodeForInstruction() : Annotation(MCFI_AID) {}
34 ~MachineCodeForInstruction();
36 static MachineCodeForInstruction &get(const Instruction *I) {
38 return *(MachineCodeForInstruction*)I->getOrCreateAnnotation(MCFI_AID);
40 static void destroy(const Instruction *I) {
41 I->deleteAnnotation(MCFI_AID);
44 // Access to underlying machine instructions...
45 typedef std::vector<MachineInstr*>::iterator iterator;
46 typedef std::vector<MachineInstr*>::const_iterator const_iterator;
48 unsigned size() const { return Contents.size(); }
49 bool empty() const { return Contents.empty(); }
50 MachineInstr *front() const { return Contents.front(); }
51 MachineInstr *back() const { return Contents.back(); }
52 MachineInstr *&operator[](unsigned i) { return Contents[i]; }
53 MachineInstr *operator[](unsigned i) const { return Contents[i]; }
54 void pop_back() { Contents.pop_back(); }
56 iterator begin() { return Contents.begin(); }
57 iterator end() { return Contents.end(); }
58 const_iterator begin() const { return Contents.begin(); }
59 const_iterator end() const { return Contents.end(); }
62 void insert(iterator where, InIt first, InIt last) {
63 Contents.insert(where, first, last);
65 iterator erase(iterator where) { return Contents.erase(where); }
66 iterator erase(iterator s, iterator e) { return Contents.erase(s, e); }
69 // dropAllReferences() - This function drops all references within
70 // temporary (hidden) instructions created in implementing the original
71 // VM intruction. This ensures there are no remaining "uses" within
72 // these hidden instructions, before the values of a method are freed.
74 void dropAllReferences();
76 const std::vector<Value*> &getTempValues() const { return tempVec; }
77 std::vector<Value*> &getTempValues() { return tempVec; }
79 MachineCodeForInstruction &addTemp(Value *tmp) {
80 tempVec.push_back(tmp);