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122 lines
4.7 KiB
C++
122 lines
4.7 KiB
C++
//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CCState class, used for lowering and implementing
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// calling conventions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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CCState::CCState(unsigned CC, bool isVarArg, const TargetMachine &tm,
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SmallVector<CCValAssign, 16> &locs)
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: CallingConv(CC), IsVarArg(isVarArg), TM(tm),
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TRI(*TM.getRegisterInfo()), Locs(locs) {
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// No stack is used.
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StackOffset = 0;
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UsedRegs.resize(TRI.getNumRegs());
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}
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// HandleByVal - Allocate a stack slot large enough to pass an argument by
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// value. The size and alignment information of the argument is encoded in its
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// parameter attribute.
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void CCState::HandleByVal(unsigned ValNo, MVT::ValueType ValVT,
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MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
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int MinSize, int MinAlign,
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unsigned ArgFlags) {
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unsigned Align = 1 << ((ArgFlags & ISD::ParamFlags::ByValAlign) >>
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ISD::ParamFlags::ByValAlignOffs);
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unsigned Size = (ArgFlags & ISD::ParamFlags::ByValSize) >>
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ISD::ParamFlags::ByValSizeOffs;
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if (MinSize > (int)Size)
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Size = MinSize;
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if (MinAlign > (int)Align)
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Align = MinAlign;
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unsigned Offset = AllocateStack(Size, Align);
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addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
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}
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/// MarkAllocated - Mark a register and all of its aliases as allocated.
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void CCState::MarkAllocated(unsigned Reg) {
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UsedRegs[Reg/32] |= 1 << (Reg&31);
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if (const unsigned *RegAliases = TRI.getAliasSet(Reg))
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for (; (Reg = *RegAliases); ++RegAliases)
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UsedRegs[Reg/32] |= 1 << (Reg&31);
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}
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/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
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/// incorporating info about the formals into this state.
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void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
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unsigned NumArgs = TheArgs->getNumValues()-1;
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for (unsigned i = 0; i != NumArgs; ++i) {
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MVT::ValueType ArgVT = TheArgs->getValueType(i);
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SDOperand FlagOp = TheArgs->getOperand(3+i);
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unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
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if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
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cerr << "Formal argument #" << i << " has unhandled type "
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<< MVT::getValueTypeString(ArgVT) << "\n";
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abort();
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}
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}
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}
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/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
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/// incorporating info about the result values into this state.
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void CCState::AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn) {
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// Determine which register each value should be copied into.
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for (unsigned i = 0, e = TheRet->getNumOperands() / 2; i != e; ++i) {
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MVT::ValueType VT = TheRet->getOperand(i*2+1).getValueType();
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if (Fn(i, VT, VT, CCValAssign::Full,
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cast<ConstantSDNode>(TheRet->getOperand(i*2+2))->getValue(), *this)){
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cerr << "Return operand #" << i << " has unhandled type "
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<< MVT::getValueTypeString(VT) << "\n";
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abort();
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}
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}
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}
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/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
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/// about the passed values into this state.
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void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
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unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
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for (unsigned i = 0; i != NumOps; ++i) {
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MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
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SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
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unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
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if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
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cerr << "Call operand #" << i << " has unhandled type "
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<< MVT::getValueTypeString(ArgVT) << "\n";
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abort();
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}
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}
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}
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/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
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/// incorporating info about the passed values into this state.
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void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
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for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
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MVT::ValueType VT = TheCall->getValueType(i);
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if (Fn(i, VT, VT, CCValAssign::Full, 0, *this)) {
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cerr << "Call result #" << i << " has unhandled type "
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<< MVT::getValueTypeString(VT) << "\n";
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abort();
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}
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}
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}
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