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
|
//===-- ubsan_value.h -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Representation of data which is passed from the compiler-generated calls into
// the ubsan runtime.
//
//===----------------------------------------------------------------------===//
#ifndef UBSAN_VALUE_H
#define UBSAN_VALUE_H
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
// FIXME: Move this out to a config header.
#if __SIZEOF_INT128__
__extension__ typedef __int128 s128;
__extension__ typedef unsigned __int128 u128;
#define HAVE_INT128_T 1
#else
#define HAVE_INT128_T 0
#endif
namespace __ubsan {
/// \brief Largest integer types we support.
#if HAVE_INT128_T
typedef s128 SIntMax;
typedef u128 UIntMax;
#else
typedef s64 SIntMax;
typedef u64 UIntMax;
#endif
/// \brief Largest floating-point type we support.
typedef long double FloatMax;
/// \brief A description of a source location. This corresponds to Clang's
/// \c PresumedLoc type.
class SourceLocation {
const char *Filename;
u32 Line;
u32 Column;
public:
SourceLocation() : Filename(), Line(), Column() {}
SourceLocation(const char *Filename, unsigned Line, unsigned Column)
: Filename(Filename), Line(Line), Column(Column) {}
/// \brief Determine whether the source location is known.
bool isInvalid() const { return !Filename; }
/// \brief Atomically acquire a copy, disabling original in-place.
/// Exactly one call to acquire() returns a copy that isn't disabled.
SourceLocation acquire() {
u32 OldColumn = __sanitizer::atomic_exchange(
(__sanitizer::atomic_uint32_t *)&Column, ~u32(0),
__sanitizer::memory_order_relaxed);
return SourceLocation(Filename, Line, OldColumn);
}
/// \brief Determine if this Location has been disabled.
/// Disabled SourceLocations are invalid to use.
bool isDisabled() {
return Column == ~u32(0);
}
/// \brief Get the presumed filename for the source location.
const char *getFilename() const { return Filename; }
/// \brief Get the presumed line number.
unsigned getLine() const { return Line; }
/// \brief Get the column within the presumed line.
unsigned getColumn() const { return Column; }
};
/// \brief A description of a type.
class TypeDescriptor {
/// A value from the \c Kind enumeration, specifying what flavor of type we
/// have.
u16 TypeKind;
/// A \c Type-specific value providing information which allows us to
/// interpret the meaning of a ValueHandle of this type.
u16 TypeInfo;
/// The name of the type follows, in a format suitable for including in
/// diagnostics.
char TypeName[1];
public:
enum Kind {
/// An integer type. Lowest bit is 1 for a signed value, 0 for an unsigned
/// value. Remaining bits are log_2(bit width). The value representation is
/// the integer itself if it fits into a ValueHandle, and a pointer to the
/// integer otherwise.
TK_Integer = 0x0000,
/// A floating-point type. Low 16 bits are bit width. The value
/// representation is that of bitcasting the floating-point value to an
/// integer type.
TK_Float = 0x0001,
/// Any other type. The value representation is unspecified.
TK_Unknown = 0xffff
};
const char *getTypeName() const { return TypeName; }
Kind getKind() const {
return static_cast<Kind>(TypeKind);
}
bool isIntegerTy() const { return getKind() == TK_Integer; }
bool isSignedIntegerTy() const {
return isIntegerTy() && (TypeInfo & 1);
}
bool isUnsignedIntegerTy() const {
return isIntegerTy() && !(TypeInfo & 1);
}
unsigned getIntegerBitWidth() const {
CHECK(isIntegerTy());
return 1 << (TypeInfo >> 1);
}
bool isFloatTy() const { return getKind() == TK_Float; }
unsigned getFloatBitWidth() const {
CHECK(isFloatTy());
return TypeInfo;
}
};
/// \brief An opaque handle to a value.
typedef uptr ValueHandle;
/// \brief Representation of an operand value provided by the instrumented code.
///
/// This is a combination of a TypeDescriptor (which is emitted as constant data
/// as an operand to a handler function) and a ValueHandle (which is passed at
/// runtime when a check failure occurs).
class Value {
/// The type of the value.
const TypeDescriptor &Type;
/// The encoded value itself.
ValueHandle Val;
/// Is \c Val a (zero-extended) integer?
bool isInlineInt() const {
CHECK(getType().isIntegerTy());
const unsigned InlineBits = sizeof(ValueHandle) * 8;
const unsigned Bits = getType().getIntegerBitWidth();
return Bits <= InlineBits;
}
/// Is \c Val a (zero-extended) integer representation of a float?
bool isInlineFloat() const {
CHECK(getType().isFloatTy());
const unsigned InlineBits = sizeof(ValueHandle) * 8;
const unsigned Bits = getType().getFloatBitWidth();
return Bits <= InlineBits;
}
public:
Value(const TypeDescriptor &Type, ValueHandle Val) : Type(Type), Val(Val) {}
const TypeDescriptor &getType() const { return Type; }
/// \brief Get this value as a signed integer.
SIntMax getSIntValue() const;
/// \brief Get this value as an unsigned integer.
UIntMax getUIntValue() const;
/// \brief Decode this value, which must be a positive or unsigned integer.
UIntMax getPositiveIntValue() const;
/// Is this an integer with value -1?
bool isMinusOne() const {
return getType().isSignedIntegerTy() && getSIntValue() == -1;
}
/// Is this a negative integer?
bool isNegative() const {
return getType().isSignedIntegerTy() && getSIntValue() < 0;
}
/// \brief Get this value as a floating-point quantity.
FloatMax getFloatValue() const;
};
} // namespace __ubsan
#endif // UBSAN_VALUE_H
|
