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//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the CCState class, used for lowering and implementing
// calling conventions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
CCState::CCState(unsigned CC, const TargetMachine &tm,
SmallVector<CCValAssign, 16> &locs)
: CallingConv(CC), TM(tm), MRI(*TM.getRegisterInfo()), Locs(locs) {
// No stack is used.
StackOffset = 0;
UsedRegs.resize(MRI.getNumRegs());
}
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31);
if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
for (; (Reg = *RegAliases); ++RegAliases)
UsedRegs[Reg/32] |= 1 << (Reg&31);
}
/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
/// about the passed values into this state.
void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
for (unsigned i = 0; i != NumOps; ++i) {
MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
cerr << "Call operand #" << i << " has unhandled type "
<< MVT::getValueTypeString(ArgVT) << "\n";
abort();
}
}
}
/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
/// incorporating info about the formals into this state.
void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
unsigned NumArgs = TheArgs->getNumValues()-1;
for (unsigned i = 0; i != NumArgs; ++i) {
MVT::ValueType ArgVT = TheArgs->getValueType(i);
SDOperand FlagOp = TheArgs->getOperand(3+i);
unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
cerr << "Formal argument #" << i << " has unhandled type "
<< MVT::getValueTypeString(ArgVT) << "\n";
abort();
}
}
}
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