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72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
//===-- MachineInstrAnnot.cpp ---------------------------------------------===//
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//
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// This file defines Annotations used to pass information between code
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// generation phases.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineInstrAnnot.h"
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#include "llvm/CodeGen/InstrSelection.h"
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#include "llvm/CodeGen/MachineCodeForInstruction.h"
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#include "llvm/iOther.h"
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#include "llvm/Type.h"
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CallArgsDescriptor::CallArgsDescriptor(CallInst* _callInstr,
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TmpInstruction* _retAddrReg,
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bool _isVarArgs, bool _noPrototype)
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: callInstr(_callInstr),
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funcPtr(isa<Function>(_callInstr->getCalledValue())
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? NULL : _callInstr->getCalledValue()),
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retAddrReg(_retAddrReg),
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isVarArgs(_isVarArgs),
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noPrototype(_noPrototype)
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{
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unsigned int numArgs = callInstr->getNumOperands();
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argInfoVec.reserve(numArgs);
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assert(callInstr->getOperand(0) == callInstr->getCalledValue()
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&& "Operand 0 is ignored in the loop below!");
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for (unsigned int i=1; i < numArgs; ++i)
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argInfoVec.push_back(CallArgInfo(callInstr->getOperand(i)));
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// Enter this object in the MachineCodeForInstr object of the CallInst.
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// This transfers ownership of this object.
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MachineCodeForInstruction::get(callInstr).setCallArgsDescriptor(this);
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}
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CallInst*
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CallArgsDescriptor::getReturnValue() const
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{
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return (callInstr->getType() == Type::VoidTy? NULL : callInstr);
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}
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// Mechanism to get the descriptor for a CALL MachineInstr.
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// We get the LLVM CallInstr from the ret. addr. register argument
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// of the CALL MachineInstr (which is explicit operand #3 for indirect
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// calls or the last implicit operand for direct calls). We then get
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// the CallArgsDescriptor from the MachineCodeForInstruction object for
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// the CallInstr.
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// This is roundabout but avoids adding a new map or annotation just
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// to keep track of CallArgsDescriptors.
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//
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CallArgsDescriptor *CallArgsDescriptor::get(const MachineInstr* MI)
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{
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const TmpInstruction* retAddrReg =
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cast<TmpInstruction>(isa<Function>(MI->getOperand(0).getVRegValue())
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? MI->getImplicitRef(MI->getNumImplicitRefs()-1)
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: MI->getOperand(2).getVRegValue());
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assert(retAddrReg->getNumOperands() == 1 &&
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isa<CallInst>(retAddrReg->getOperand(0)) &&
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"Location of callInstr arg for CALL instr. changed? FIX THIS CODE!");
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const CallInst* callInstr = cast<CallInst>(retAddrReg->getOperand(0));
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CallArgsDescriptor* desc =
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MachineCodeForInstruction::get(callInstr).getCallArgsDescriptor();
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assert(desc->getCallInst()==callInstr && "Incorrect call args descriptor?");
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return desc;
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}
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