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72 lines
2.6 KiB
C++
72 lines
2.6 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 was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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/MRegisterInfo.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, const TargetMachine &tm,
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SmallVector<CCValAssign, 16> &locs)
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: CallingConv(CC), TM(tm), MRI(*TM.getRegisterInfo()), Locs(locs) {
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// No stack is used.
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StackOffset = 0;
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UsedRegs.resize(MRI.getNumRegs());
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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 = MRI.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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/// 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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/// 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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