1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the CCState class, used for lowering and implementing
// calling conventions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
CCState::CCState(unsigned CC, bool isVarArg, const TargetMachine &tm,
SmallVector<CCValAssign, 16> &locs)
: CallingConv(CC), IsVarArg(isVarArg), TM(tm),
MRI(*TM.getRegisterInfo()), Locs(locs) {
// No stack is used.
StackOffset = 0;
UsedRegs.resize(MRI.getNumRegs());
}
void CCState::HandleStruct(unsigned ValNo, MVT::ValueType ValVT,
MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
unsigned ArgFlags) {
unsigned Align = 1 << ((ArgFlags & ISD::ParamFlags::ByValAlign) >>
ISD::ParamFlags::ByValAlignOffs);
unsigned Size = (ArgFlags & ISD::ParamFlags::ByValSize) >>
ISD::ParamFlags::ByValSizeOffs;
unsigned Offset = AllocateStack(Size, Align);
addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
}
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31);
if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
for (; (Reg = *RegAliases); ++RegAliases)
UsedRegs[Reg/32] |= 1 << (Reg&31);
}
/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
/// incorporating info about the formals into this state.
void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
unsigned NumArgs = TheArgs->getNumValues()-1;
for (unsigned i = 0; i != NumArgs; ++i) {
MVT::ValueType ArgVT = TheArgs->getValueType(i);
SDOperand FlagOp = TheArgs->getOperand(3+i);
unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
cerr << "Formal argument #" << i << " has unhandled type "
<< MVT::getValueTypeString(ArgVT) << "\n";
abort();
}
}
}
/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
/// incorporating info about the result values into this state.
void CCState::AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn) {
// Determine which register each value should be copied into.
for (unsigned i = 0, e = TheRet->getNumOperands() / 2; i != e; ++i) {
MVT::ValueType VT = TheRet->getOperand(i*2+1).getValueType();
if (Fn(i, VT, VT, CCValAssign::Full,
cast<ConstantSDNode>(TheRet->getOperand(i*2+2))->getValue(), *this)){
cerr << "Return operand #" << i << " has unhandled type "
<< MVT::getValueTypeString(VT) << "\n";
abort();
}
}
}
/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
/// about the passed values into this state.
void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
for (unsigned i = 0; i != NumOps; ++i) {
MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
cerr << "Call operand #" << i << " has unhandled type "
<< MVT::getValueTypeString(ArgVT) << "\n";
abort();
}
}
}
/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
/// incorporating info about the passed values into this state.
void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
MVT::ValueType VT = TheCall->getValueType(i);
if (Fn(i, VT, VT, CCValAssign::Full, 0, *this)) {
cerr << "Call result #" << i << " has unhandled type "
<< MVT::getValueTypeString(VT) << "\n";
abort();
}
}
}
|
