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//===-- llvm/CodeGen/MachineCodeForInstruction.h ----------------*- C++ -*-===//
//
// Representation of the sequence of machine instructions created for a single
// VM instruction. Additionally records information about hidden and implicit
// values used by the machine instructions: about hidden values used by the
// machine instructions:
//
// "Temporary values" are intermediate values used in the machine instruction
// sequence, but not in the VM instruction Note that such values should be
// treated as pure SSA values with no interpretation of their operands (i.e., as
// a TmpInstruction object which actually represents such a value).
//
// (2) "Implicit uses" are values used in the VM instruction but not in
// the machine instruction sequence
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINECODE_FOR_INSTRUCTION_H
#define LLVM_CODEGEN_MACHINECODE_FOR_INSTRUCTION_H
#include "llvm/Annotation.h"
#include <vector>
class MachineInstr;
class Instruction;
class Value;
class CallArgsDescriptor;
extern AnnotationID MCFI_AID;
class MachineCodeForInstruction : public Annotation {
std::vector<Value*> tempVec; // used by m/c instr but not VM instr
std::vector<MachineInstr*> Contents; // the machine instr for this VM instr
CallArgsDescriptor* callArgsDesc; // only used for CALL instructions
public:
MachineCodeForInstruction() : Annotation(MCFI_AID) {}
~MachineCodeForInstruction();
static MachineCodeForInstruction &get(const Instruction *I) {
assert(I != NULL);
return *(MachineCodeForInstruction*)
((Annotable*)I)->getOrCreateAnnotation(MCFI_AID);
}
static void destroy(const Instruction *I) {
((Annotable*)I)->deleteAnnotation(MCFI_AID);
}
// Access to underlying machine instructions...
typedef std::vector<MachineInstr*>::iterator iterator;
typedef std::vector<MachineInstr*>::const_iterator const_iterator;
unsigned size() const { return Contents.size(); }
bool empty() const { return Contents.empty(); }
MachineInstr *front() const { return Contents.front(); }
MachineInstr *back() const { return Contents.back(); }
MachineInstr *&operator[](unsigned i) { return Contents[i]; }
MachineInstr *operator[](unsigned i) const { return Contents[i]; }
void pop_back() { Contents.pop_back(); }
iterator begin() { return Contents.begin(); }
iterator end() { return Contents.end(); }
const_iterator begin() const { return Contents.begin(); }
const_iterator end() const { return Contents.end(); }
template<class InIt>
void insert(iterator where, InIt first, InIt last) {
Contents.insert(where, first, last);
}
iterator erase(iterator where) { return Contents.erase(where); }
iterator erase(iterator s, iterator e) { return Contents.erase(s, e); }
// dropAllReferences() - This function drops all references within
// temporary (hidden) instructions created in implementing the original
// VM intruction. This ensures there are no remaining "uses" within
// these hidden instructions, before the values of a method are freed.
//
void dropAllReferences();
const std::vector<Value*> &getTempValues() const { return tempVec; }
std::vector<Value*> &getTempValues() { return tempVec; }
MachineCodeForInstruction &addTemp(Value *tmp) {
tempVec.push_back(tmp);
return *this;
}
void setCallArgsDescriptor(CallArgsDescriptor* desc) { callArgsDesc = desc; }
CallArgsDescriptor* getCallArgsDescriptor() const { return callArgsDesc; }
};
#endif
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