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https://github.com/capstone-engine/llvm-capstone.git
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e47b89d1f8
Summary:
There is a problem with analyzer that a wrong value is given when modeling the increment operator of the operand with type bool. After `rL307604` is applied, a unsigned overflow may occur.
Example:
```
void func() {
bool b = true;
// unsigned overflow occur, 2 -> 0 U1b
b++;
}
```
The use of an operand of type bool with the ++ operators is deprecated but valid untill C++17. And if the operand of the increment operator is of type bool, it is set to true.
This patch includes two parts:
- If the operand of the increment operator is of type bool or type _Bool, set to true.
- Modify `BasicValueFactory::getTruthValue()`, use `getIntWidth()` instead `getTypeSize()` and use `unsigned` instead `signed`.
Reviewers: alexshap, NoQ, dcoughlin, george.karpenkov
Reviewed By: NoQ
Subscribers: xazax.hun, szepet, a.sidorin, cfe-commits, MTC
Differential Revision: https://reviews.llvm.org/D43741
llvm-svn: 326776
85 lines
1.6 KiB
C++
85 lines
1.6 KiB
C++
// RUN: %clang_analyze_cc1 -analyzer-checker=debug.ExprInspection -verify -std=c++98 -Wno-deprecated %s
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// RUN: %clang_analyze_cc1 -analyzer-checker=debug.ExprInspection -verify -std=c++11 -Wno-deprecated %s
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// RUN: %clang_analyze_cc1 -analyzer-checker=debug.ExprInspection -verify -std=c++14 -Wno-deprecated %s
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extern void clang_analyzer_eval(bool);
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void test_bool_value() {
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{
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bool b = true;
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clang_analyzer_eval(b == 1); // expected-warning{{TRUE}}
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}
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{
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bool b = false;
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clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
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}
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{
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bool b = -10;
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clang_analyzer_eval(b == 1); // expected-warning{{TRUE}}
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}
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{
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bool b = 10;
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clang_analyzer_eval(b == 1); // expected-warning{{TRUE}}
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}
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{
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bool b = 10;
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b++;
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clang_analyzer_eval(b == 1); // expected-warning{{TRUE}}
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}
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{
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bool b = 0;
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b++;
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clang_analyzer_eval(b == 1); // expected-warning{{TRUE}}
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}
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}
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void test_bool_increment() {
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{
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bool b = true;
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b++;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = false;
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b++;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = true;
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++b;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = false;
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++b;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = 0;
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++b;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = 10;
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++b;
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++b;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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{
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bool b = -10;
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++b;
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clang_analyzer_eval(b); // expected-warning{{TRUE}}
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}
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}
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