1 //===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the CCState class, used for lowering and implementing
11 // calling conventions.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/CodeGen/CallingConvLower.h"
16 #include "llvm/CodeGen/SelectionDAGNodes.h"
17 #include "llvm/Target/MRegisterInfo.h"
18 #include "llvm/Target/TargetData.h"
19 #include "llvm/Target/TargetMachine.h"
22 CCState::CCState(unsigned CC, bool isVarArg, const TargetMachine &tm,
23 SmallVector<CCValAssign, 16> &locs)
24 : CallingConv(CC), IsVarArg(isVarArg), TM(tm),
25 MRI(*TM.getRegisterInfo()), Locs(locs) {
29 UsedRegs.resize(MRI.getNumRegs());
32 void CCState::HandleStruct(unsigned ValNo, MVT::ValueType ValVT,
33 MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
35 unsigned MinAlign = TM.getTargetData()->getPointerABIAlignment();
36 unsigned Align = 1 << ((ArgFlags & ISD::ParamFlags::ByValAlign) >>
37 ISD::ParamFlags::ByValAlignOffs);
38 unsigned Size = (ArgFlags & ISD::ParamFlags::ByValSize) >>
39 ISD::ParamFlags::ByValSizeOffs;
40 unsigned Offset = AllocateStack(Size, std::max(MinAlign, Align));
42 addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
45 /// MarkAllocated - Mark a register and all of its aliases as allocated.
46 void CCState::MarkAllocated(unsigned Reg) {
47 UsedRegs[Reg/32] |= 1 << (Reg&31);
49 if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
50 for (; (Reg = *RegAliases); ++RegAliases)
51 UsedRegs[Reg/32] |= 1 << (Reg&31);
54 /// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
55 /// incorporating info about the formals into this state.
56 void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
57 unsigned NumArgs = TheArgs->getNumValues()-1;
59 for (unsigned i = 0; i != NumArgs; ++i) {
60 MVT::ValueType ArgVT = TheArgs->getValueType(i);
61 SDOperand FlagOp = TheArgs->getOperand(3+i);
62 unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
63 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
64 cerr << "Formal argument #" << i << " has unhandled type "
65 << MVT::getValueTypeString(ArgVT) << "\n";
71 /// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
72 /// incorporating info about the result values into this state.
73 void CCState::AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn) {
74 // Determine which register each value should be copied into.
75 for (unsigned i = 0, e = TheRet->getNumOperands() / 2; i != e; ++i) {
76 MVT::ValueType VT = TheRet->getOperand(i*2+1).getValueType();
77 if (Fn(i, VT, VT, CCValAssign::Full,
78 cast<ConstantSDNode>(TheRet->getOperand(i*2+2))->getValue(), *this)){
79 cerr << "Return operand #" << i << " has unhandled type "
80 << MVT::getValueTypeString(VT) << "\n";
87 /// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
88 /// about the passed values into this state.
89 void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
90 unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
91 for (unsigned i = 0; i != NumOps; ++i) {
92 MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
93 SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
94 unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
95 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
96 cerr << "Call operand #" << i << " has unhandled type "
97 << MVT::getValueTypeString(ArgVT) << "\n";
103 /// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
104 /// incorporating info about the passed values into this state.
105 void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
106 for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
107 MVT::ValueType VT = TheCall->getValueType(i);
108 if (Fn(i, VT, VT, CCValAssign::Full, 0, *this)) {
109 cerr << "Call result #" << i << " has unhandled type "
110 << MVT::getValueTypeString(VT) << "\n";