forked from danmar/cppcheck
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcheck64bit.cpp
More file actions
165 lines (144 loc) · 7.6 KB
/
check64bit.cpp
File metadata and controls
165 lines (144 loc) · 7.6 KB
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
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2013 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
// 64-bit portability
//---------------------------------------------------------------------------
#include "check64bit.h"
#include "symboldatabase.h"
//---------------------------------------------------------------------------
// Register this check class (by creating a static instance of it)
namespace {
Check64BitPortability instance;
}
/** Is given variable a pointer or array? */
static bool isaddr(const Variable *var)
{
return (var && (var->isPointer() || var->isArray()));
}
/** Is given variable an integer variable */
static bool isint(const Variable *var)
{
return (var && Token::Match(var->nameToken()->previous(), "int|long|DWORD %var% !!["));
}
void Check64BitPortability::pointerassignment()
{
if (!_settings->isEnabled("portability"))
return;
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
// Check return values
const std::size_t functions = symbolDatabase->functionScopes.size();
for (std::size_t i = 0; i < functions; ++i) {
const Scope * scope = symbolDatabase->functionScopes[i];
if (scope->function == 0 || !scope->function->hasBody) // We only look for functions with a body
continue;
bool retPointer = false;
if (scope->function->token->strAt(-1) == "*") // Function returns a pointer
retPointer = true;
else if (Token::Match(scope->function->token->previous(), "int|long|DWORD")) // Function returns an integer
;
else
continue;
for (const Token* tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
if (Token::Match(tok, "return %var%|%num% [;+]") && !Token::simpleMatch(tok, "return 0 ;")) {
enum { NO, INT, PTR, PTRDIFF } type = NO;
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if ((type == NO || type == INT) && Token::Match(tok2, "%var% [+;]") && isaddr(tok2->variable()))
type = PTR;
else if (type == NO && (tok2->isNumber() || isint(tok2->variable())))
type = INT;
else if (type == PTR && Token::Match(tok2, "- %var%") && isaddr(tok2->next()->variable()))
type = PTRDIFF;
else if (Token::Match(tok2, "(")) {
type = NO;
break;
} else if (tok2->str() == "(") {
// TODO: handle parentheses
type = NO;
break;
} else if (type == PTR && Token::simpleMatch(tok2, "."))
type = NO; // Reset after pointer reference, see #4642
else if (tok2->str() == ";")
break;
}
if (retPointer && (type == INT || type == PTRDIFF))
returnIntegerError(tok);
else if (!retPointer && type == PTR)
returnPointerError(tok);
}
}
}
// Check assignments
for (std::size_t i = 0; i < functions; ++i) {
const Scope * scope = symbolDatabase->functionScopes[i];
for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
if (Token::Match(tok, "[;{}] %var% = %var% [;+]")) {
const Variable *var1(tok->next()->variable());
const Variable *var2(tok->tokAt(3)->variable());
if (isaddr(var1) && isint(var2) && tok->strAt(4) != "+")
assignmentIntegerToAddressError(tok->next());
else if (isint(var1) && isaddr(var2) && !tok->tokAt(3)->isPointerCompare()) {
// assigning address => warning
// some trivial addition => warning
if (Token::Match(tok->tokAt(4), "+ %any% !!;"))
continue;
assignmentAddressToIntegerError(tok->next());
}
}
}
}
}
void Check64BitPortability::assignmentAddressToIntegerError(const Token *tok)
{
reportError(tok, Severity::portability,
"AssignmentAddressToInteger",
"Assigning a pointer to an integer is not portable.\n"
"Assigning a pointer to an integer (int/long/etc) is not portable across different platforms and "
"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
"they are of different width. In worst case you end up assigning 64-bit address to 32-bit integer. The safe "
"way is to store addresses only in pointer types (or typedefs like uintptr_t).");
}
void Check64BitPortability::assignmentIntegerToAddressError(const Token *tok)
{
reportError(tok, Severity::portability,
"AssignmentIntegerToAddress",
"Assigning an integer to a pointer is not portable.\n"
"Assigning an integer (int/long/etc) to a pointer is not portable across different platforms and "
"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
"they are of different width. In worst case you end up assigning 64-bit integer to 32-bit pointer. The safe "
"way is to store addresses only in pointer types (or typedefs like uintptr_t).");
}
void Check64BitPortability::returnPointerError(const Token *tok)
{
reportError(tok, Severity::portability,
"CastAddressToIntegerAtReturn",
"Returning an address value in a function with integer return type is not portable.\n"
"Returning an address value in a function with integer (int/long/etc) return type is not portable across "
"different platforms and compilers. For example in 32-bit Windows and Linux they are same width, but in "
"64-bit Windows and Linux they are of different width. In worst case you end up casting 64-bit address down "
"to 32-bit integer. The safe way is to always return an integer.");
}
void Check64BitPortability::returnIntegerError(const Token *tok)
{
reportError(tok, Severity::portability,
"CastIntegerToAddressAtReturn",
"Returning an integer in a function with pointer return type is not portable.\n"
"Returning an integer (int/long/etc) in a function with pointer return type is not portable across different "
"platforms and compilers. For example in 32-bit Windows and Linux they are same width, but in 64-bit Windows "
"and Linux they are of different width. In worst case you end up casting 64-bit integer down to 32-bit pointer. "
"The safe way is to always return a pointer.");
}