llvm-project/clang/docs/analyzer/checkers/mismatched_deallocator_example.cpp
Kristof Umann 1a17032b78 [analyzer] Creating standard Sphinx documentation
The lack of documentation has been a long standing issue in the Static Analyzer,
and one of the leading reasons behind this was a lack of good documentation
infrastucture.

This lead serious drawbacks, such as
* Not having proper release notes for years
* Not being able to have a sensible auto-generated checker documentations (which
lead to most of them not having any)
* The HTML website that has to updated manually is a chore, and has been
outdated for a long while
* Many design discussions are now hidden in phabricator revisions

This patch implements a new documentation infrastucture using Sphinx, like most
of the other subprojects in LLVM. It transformed some pages as a proof-of-
concept, with many others to follow in later patches. The eventual goal is to
preserve the original website's (https://clang-analyzer.llvm.org/) frontpage,
but move everything else to the new format.

Some other ideas, like creating a unipage for each checker (similar to how
clang-tidy works now), are also being discussed.

Patch by Dániel Krupp!

Differential Revision: https://reviews.llvm.org/D54429

llvm-svn: 353126
2019-02-05 00:39:33 +00:00

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1009 B
C++

// C, C++
void test() {
int *p = (int *)malloc(sizeof(int));
delete p; // warn
}
// C, C++
void __attribute((ownership_returns(malloc))) *user_malloc(size_t);
void test() {
int *p = (int *)user_malloc(sizeof(int));
delete p; // warn
}
// C, C++
void test() {
int *p = new int;
free(p); // warn
}
// C, C++
void test() {
int *p = new int[1];
realloc(p, sizeof(long)); // warn
}
// C, C++
template <typename T>
struct SimpleSmartPointer {
T *ptr;
explicit SimpleSmartPointer(T *p = 0) : ptr(p) {}
~SimpleSmartPointer() {
delete ptr; // warn
}
};
void test() {
SimpleSmartPointer<int> a((int *)malloc(4));
}
// C++
void test() {
int *p = (int *)operator new(0);
delete[] p; // warn
}
// Objective-C, C++
void test(NSUInteger dataLength) {
int *p = new int;
NSData *d = [NSData dataWithBytesNoCopy:p
length:sizeof(int) freeWhenDone:1];
// warn +dataWithBytesNoCopy:length:freeWhenDone: cannot take
// ownership of memory allocated by 'new'
}