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/TargetRegisterInfo.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 TRI(*TM.getRegisterInfo()), Locs(locs) {
29 UsedRegs.resize(TRI.getNumRegs());
32 // HandleByVal - Allocate a stack slot large enough to pass an argument by
33 // value. The size and alignment information of the argument is encoded in its
34 // parameter attribute.
35 void CCState::HandleByVal(unsigned ValNo, MVT::ValueType ValVT,
36 MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
37 int MinSize, int MinAlign,
39 unsigned Align = 1 << ((ArgFlags & ISD::ParamFlags::ByValAlign) >>
40 ISD::ParamFlags::ByValAlignOffs);
41 unsigned Size = (ArgFlags & ISD::ParamFlags::ByValSize) >>
42 ISD::ParamFlags::ByValSizeOffs;
43 if (MinSize > (int)Size)
45 if (MinAlign > (int)Align)
47 unsigned Offset = AllocateStack(Size, Align);
49 addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
52 /// MarkAllocated - Mark a register and all of its aliases as allocated.
53 void CCState::MarkAllocated(unsigned Reg) {
54 UsedRegs[Reg/32] |= 1 << (Reg&31);
56 if (const unsigned *RegAliases = TRI.getAliasSet(Reg))
57 for (; (Reg = *RegAliases); ++RegAliases)
58 UsedRegs[Reg/32] |= 1 << (Reg&31);
61 /// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
62 /// incorporating info about the formals into this state.
63 void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
64 unsigned NumArgs = TheArgs->getNumValues()-1;
66 for (unsigned i = 0; i != NumArgs; ++i) {
67 MVT::ValueType ArgVT = TheArgs->getValueType(i);
68 SDOperand FlagOp = TheArgs->getOperand(3+i);
69 unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
70 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
71 cerr << "Formal argument #" << i << " has unhandled type "
72 << MVT::getValueTypeString(ArgVT) << "\n";
78 /// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
79 /// incorporating info about the result values into this state.
80 void CCState::AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn) {
81 // Determine which register each value should be copied into.
82 for (unsigned i = 0, e = TheRet->getNumOperands() / 2; i != e; ++i) {
83 MVT::ValueType VT = TheRet->getOperand(i*2+1).getValueType();
84 if (Fn(i, VT, VT, CCValAssign::Full,
85 cast<ConstantSDNode>(TheRet->getOperand(i*2+2))->getValue(), *this)){
86 cerr << "Return operand #" << i << " has unhandled type "
87 << MVT::getValueTypeString(VT) << "\n";
94 /// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
95 /// about the passed values into this state.
96 void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
97 unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
98 for (unsigned i = 0; i != NumOps; ++i) {
99 MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
100 SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
101 unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
102 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
103 cerr << "Call operand #" << i << " has unhandled type "
104 << MVT::getValueTypeString(ArgVT) << "\n";
110 /// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
111 /// incorporating info about the passed values into this state.
112 void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
113 for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
114 MVT::ValueType VT = TheCall->getValueType(i);
115 if (Fn(i, VT, VT, CCValAssign::Full, 0, *this)) {
116 cerr << "Call result #" << i << " has unhandled type "
117 << MVT::getValueTypeString(VT) << "\n";