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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
//===-- llvm/CallingConvLower.cpp - Calling Convention lowering -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Hexagon_CCState class, used for lowering and
// implementing calling conventions. Adapted from the machine independent
// version of the class (CCState) but this handles calls to varargs functions
//
//===----------------------------------------------------------------------===//
#include "HexagonCallingConvLower.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "Hexagon.h"
using namespace llvm;
Hexagon_CCState::Hexagon_CCState(CallingConv::ID CC, bool isVarArg,
const TargetMachine &tm,
SmallVector<CCValAssign, 16> &locs,
LLVMContext &c)
: CallingConv(CC), IsVarArg(isVarArg), TM(tm),
TRI(*TM.getRegisterInfo()), Locs(locs), Context(c) {
// No stack is used.
StackOffset = 0;
UsedRegs.resize((TRI.getNumRegs()+31)/32);
}
// HandleByVal - Allocate a stack slot large enough to pass an argument by
// value. The size and alignment information of the argument is encoded in its
// parameter attribute.
void Hexagon_CCState::HandleByVal(unsigned ValNo, EVT ValVT,
EVT LocVT, CCValAssign::LocInfo LocInfo,
int MinSize, int MinAlign,
ISD::ArgFlagsTy ArgFlags) {
unsigned Align = ArgFlags.getByValAlign();
unsigned Size = ArgFlags.getByValSize();
if (MinSize > (int)Size)
Size = MinSize;
if (MinAlign > (int)Align)
Align = MinAlign;
unsigned Offset = AllocateStack(Size, Align);
addLoc(CCValAssign::getMem(ValNo, ValVT.getSimpleVT(), Offset,
LocVT.getSimpleVT(), LocInfo));
}
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void Hexagon_CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31);
if (const unsigned *RegAliases = TRI.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
Hexagon_CCState::AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg>
&Ins,
Hexagon_CCAssignFn Fn,
unsigned SretValueInRegs) {
unsigned NumArgs = Ins.size();
unsigned i = 0;
// If the function returns a small struct in registers, skip
// over the first (dummy) argument.
if (SretValueInRegs != 0) {
++i;
}
for (; i != NumArgs; ++i) {
EVT ArgVT = Ins[i].VT;
ISD::ArgFlagsTy ArgFlags = Ins[i].Flags;
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this, 0, 0, false)) {
dbgs() << "Formal argument #" << i << " has unhandled type "
<< ArgVT.getEVTString() << "\n";
abort();
}
}
}
/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
/// incorporating info about the result values into this state.
void
Hexagon_CCState::AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
Hexagon_CCAssignFn Fn,
unsigned SretValueInRegs) {
// For Hexagon, Return small structures in registers.
if (SretValueInRegs != 0) {
if (SretValueInRegs <= 32) {
unsigned Reg = Hexagon::R0;
addLoc(CCValAssign::getReg(0, MVT::i32, Reg, MVT::i32,
CCValAssign::Full));
return;
}
if (SretValueInRegs <= 64) {
unsigned Reg = Hexagon::D0;
addLoc(CCValAssign::getReg(0, MVT::i64, Reg, MVT::i64,
CCValAssign::Full));
return;
}
}
// Determine which register each value should be copied into.
for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
EVT VT = Outs[i].VT;
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this, -1, -1, false)){
dbgs() << "Return operand #" << i << " has unhandled type "
<< VT.getEVTString() << "\n";
abort();
}
}
}
/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
/// about the passed values into this state.
void
Hexagon_CCState::AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg>
&Outs,
Hexagon_CCAssignFn Fn,
int NonVarArgsParams,
unsigned SretValueSize) {
unsigned NumOps = Outs.size();
unsigned i = 0;
// If the called function returns a small struct in registers, skip
// the first actual parameter. We do not want to pass a pointer to
// the stack location.
if (SretValueSize != 0) {
++i;
}
for (; i != NumOps; ++i) {
EVT ArgVT = Outs[i].VT;
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this,
NonVarArgsParams, i+1, false)) {
dbgs() << "Call operand #" << i << " has unhandled type "
<< ArgVT.getEVTString() << "\n";
abort();
}
}
}
/// AnalyzeCallOperands - Same as above except it takes vectors of types
/// and argument flags.
void
Hexagon_CCState::AnalyzeCallOperands(SmallVectorImpl<EVT> &ArgVTs,
SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
Hexagon_CCAssignFn Fn) {
unsigned NumOps = ArgVTs.size();
for (unsigned i = 0; i != NumOps; ++i) {
EVT ArgVT = ArgVTs[i];
ISD::ArgFlagsTy ArgFlags = Flags[i];
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this, -1, -1,
false)) {
dbgs() << "Call operand #" << i << " has unhandled type "
<< ArgVT.getEVTString() << "\n";
abort();
}
}
}
/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
/// incorporating info about the passed values into this state.
void
Hexagon_CCState::AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
Hexagon_CCAssignFn Fn,
unsigned SretValueInRegs) {
for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
EVT VT = Ins[i].VT;
ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
if (Fn(i, VT, VT, CCValAssign::Full, Flags, *this, -1, -1, false)) {
dbgs() << "Call result #" << i << " has unhandled type "
<< VT.getEVTString() << "\n";
abort();
}
}
}
/// AnalyzeCallResult - Same as above except it's specialized for calls which
/// produce a single value.
void Hexagon_CCState::AnalyzeCallResult(EVT VT, Hexagon_CCAssignFn Fn) {
if (Fn(0, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this, -1, -1,
false)) {
dbgs() << "Call result has unhandled type "
<< VT.getEVTString() << "\n";
abort();
}
}
|