149 lines
5.4 KiB
C++
149 lines
5.4 KiB
C++
//===-- 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/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()+31)/32);
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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 ValVT,
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MVT LocVT, CCValAssign::LocInfo LocInfo,
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int MinSize, int MinAlign,
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ISD::ArgFlagsTy ArgFlags) {
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unsigned Align = ArgFlags.getByValAlign();
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unsigned Size = ArgFlags.getByValSize();
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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 ArgVT = TheArgs->getValueType(i);
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ISD::ArgFlagsTy ArgFlags =
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cast<ARG_FLAGSSDNode>(TheArgs->getOperand(3+i))->getArgFlags();
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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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<< ArgVT.getMVTString() << "\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 VT = TheRet->getOperand(i*2+1).getValueType();
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ISD::ArgFlagsTy ArgFlags =
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cast<ARG_FLAGSSDNode>(TheRet->getOperand(i*2+2))->getArgFlags();
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if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this)){
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cerr << "Return operand #" << i << " has unhandled type "
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<< VT.getMVTString() << "\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(CallSDNode *TheCall, CCAssignFn Fn) {
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unsigned NumOps = TheCall->getNumArgs();
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for (unsigned i = 0; i != NumOps; ++i) {
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MVT ArgVT = TheCall->getArg(i).getValueType();
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ISD::ArgFlagsTy ArgFlags = TheCall->getArgFlags(i);
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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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<< ArgVT.getMVTString() << "\n";
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abort();
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}
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}
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}
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/// AnalyzeCallOperands - Same as above except it takes vectors of types
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/// and argument flags.
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void CCState::AnalyzeCallOperands(SmallVectorImpl<MVT> &ArgVTs,
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SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
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CCAssignFn Fn) {
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unsigned NumOps = ArgVTs.size();
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for (unsigned i = 0; i != NumOps; ++i) {
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MVT ArgVT = ArgVTs[i];
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ISD::ArgFlagsTy ArgFlags = Flags[i];
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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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<< ArgVT.getMVTString() << "\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(CallSDNode *TheCall, CCAssignFn Fn) {
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for (unsigned i = 0, e = TheCall->getNumRetVals(); i != e; ++i) {
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MVT VT = TheCall->getRetValType(i);
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ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
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if (TheCall->isInreg())
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Flags.setInReg();
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if (Fn(i, VT, VT, CCValAssign::Full, Flags, *this)) {
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cerr << "Call result #" << i << " has unhandled type "
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<< VT.getMVTString() << "\n";
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abort();
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}
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}
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}
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/// AnalyzeCallResult - Same as above except it's specialized for calls which
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/// produce a single value.
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void CCState::AnalyzeCallResult(MVT VT, CCAssignFn Fn) {
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if (Fn(0, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this)) {
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cerr << "Call result has unhandled type "
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<< VT.getMVTString() << "\n";
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abort();
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}
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}
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