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
208
209
210
211
212
213
214
215
216
|
//===-- AVRMCExpr.cpp - AVR specific MC expression classes ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "AVRMCExpr.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCValue.h"
namespace llvm {
namespace {
const struct ModifierEntry {
const char * const Spelling;
AVRMCExpr::VariantKind VariantKind;
} ModifierNames[] = {
{"lo8", AVRMCExpr::VK_AVR_LO8}, {"hi8", AVRMCExpr::VK_AVR_HI8},
{"hh8", AVRMCExpr::VK_AVR_HH8}, // synonym with hlo8
{"hlo8", AVRMCExpr::VK_AVR_HH8}, {"hhi8", AVRMCExpr::VK_AVR_HHI8},
{"pm_lo8", AVRMCExpr::VK_AVR_PM_LO8}, {"pm_hi8", AVRMCExpr::VK_AVR_PM_HI8},
{"pm_hh8", AVRMCExpr::VK_AVR_PM_HH8},
{"lo8_gs", AVRMCExpr::VK_AVR_LO8_GS}, {"hi8_gs", AVRMCExpr::VK_AVR_HI8_GS},
{"gs", AVRMCExpr::VK_AVR_GS},
};
} // end of anonymous namespace
const AVRMCExpr *AVRMCExpr::create(VariantKind Kind, const MCExpr *Expr,
bool Negated, MCContext &Ctx) {
return new (Ctx) AVRMCExpr(Kind, Expr, Negated);
}
void AVRMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
assert(Kind != VK_AVR_None);
if (isNegated())
OS << '-';
OS << getName() << '(';
getSubExpr()->print(OS, MAI);
OS << ')';
}
bool AVRMCExpr::evaluateAsConstant(int64_t &Result) const {
MCValue Value;
bool isRelocatable =
getSubExpr()->evaluateAsRelocatable(Value, nullptr, nullptr);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = evaluateAsInt64(Value.getConstant());
return true;
}
return false;
}
bool AVRMCExpr::evaluateAsRelocatableImpl(MCValue &Result,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
MCValue Value;
bool isRelocatable = SubExpr->evaluateAsRelocatable(Value, Layout, Fixup);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = MCValue::get(evaluateAsInt64(Value.getConstant()));
} else {
if (!Layout) return false;
MCContext &Context = Layout->getAssembler().getContext();
const MCSymbolRefExpr *Sym = Value.getSymA();
MCSymbolRefExpr::VariantKind Modifier = Sym->getKind();
if (Modifier != MCSymbolRefExpr::VK_None)
return false;
Sym = MCSymbolRefExpr::create(&Sym->getSymbol(), Modifier, Context);
Result = MCValue::get(Sym, Value.getSymB(), Value.getConstant());
}
return true;
}
int64_t AVRMCExpr::evaluateAsInt64(int64_t Value) const {
if (Negated)
Value *= -1;
switch (Kind) {
case AVRMCExpr::VK_AVR_LO8:
Value &= 0xff;
break;
case AVRMCExpr::VK_AVR_HI8:
Value &= 0xff00;
Value >>= 8;
break;
case AVRMCExpr::VK_AVR_HH8:
Value &= 0xff0000;
Value >>= 16;
break;
case AVRMCExpr::VK_AVR_HHI8:
Value &= 0xff000000;
Value >>= 24;
break;
case AVRMCExpr::VK_AVR_PM_LO8:
case AVRMCExpr::VK_AVR_LO8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff;
break;
case AVRMCExpr::VK_AVR_PM_HI8:
case AVRMCExpr::VK_AVR_HI8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff00;
Value >>= 8;
break;
case AVRMCExpr::VK_AVR_PM_HH8:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff0000;
Value >>= 16;
break;
case AVRMCExpr::VK_AVR_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
break;
case AVRMCExpr::VK_AVR_None:
llvm_unreachable("Uninitialized expression.");
}
return static_cast<uint64_t>(Value) & 0xff;
}
AVR::Fixups AVRMCExpr::getFixupKind() const {
AVR::Fixups Kind = AVR::Fixups::LastTargetFixupKind;
switch (getKind()) {
case VK_AVR_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_neg : AVR::fixup_lo8_ldi;
break;
case VK_AVR_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_neg : AVR::fixup_hi8_ldi;
break;
case VK_AVR_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_neg : AVR::fixup_hh8_ldi;
break;
case VK_AVR_HHI8:
Kind = isNegated() ? AVR::fixup_ms8_ldi_neg : AVR::fixup_ms8_ldi;
break;
case VK_AVR_PM_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_pm_neg : AVR::fixup_lo8_ldi_pm;
break;
case VK_AVR_PM_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_pm_neg : AVR::fixup_hi8_ldi_pm;
break;
case VK_AVR_PM_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_pm_neg : AVR::fixup_hh8_ldi_pm;
break;
case VK_AVR_GS:
Kind = AVR::fixup_16_pm;
break;
case VK_AVR_LO8_GS:
Kind = AVR::fixup_lo8_ldi_gs;
break;
case VK_AVR_HI8_GS:
Kind = AVR::fixup_hi8_ldi_gs;
break;
case VK_AVR_None:
llvm_unreachable("Uninitialized expression");
}
return Kind;
}
void AVRMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
const char *AVRMCExpr::getName() const {
const auto &Modifier =
llvm::find_if(ModifierNames, [this](ModifierEntry const &Mod) {
return Mod.VariantKind == Kind;
});
if (Modifier != std::end(ModifierNames)) {
return Modifier->Spelling;
}
return nullptr;
}
AVRMCExpr::VariantKind AVRMCExpr::getKindByName(StringRef Name) {
const auto &Modifier =
llvm::find_if(ModifierNames, [&Name](ModifierEntry const &Mod) {
return Mod.Spelling == Name;
});
if (Modifier != std::end(ModifierNames)) {
return Modifier->VariantKind;
}
return VK_AVR_None;
}
} // end of namespace llvm
|
