forked from OSchip/llvm-project
166 lines
4.8 KiB
HTML
166 lines
4.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>Implicit Checks</title>
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<link type="text/css" rel="stylesheet" href="menu.css">
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<link type="text/css" rel="stylesheet" href="content.css">
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<script type="text/javascript" src="scripts/menu.js"></script>
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<script type="text/javascript" src="scripts/expandcollapse.js"></script>
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<style type="text/css">
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tr:first-child { width:20%; }
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</style>
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</head>
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<body onload="initExpandCollapse()">
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<div id="page">
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<!--#include virtual="menu.html.incl"-->
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<div id="content">
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<h1>Implicit Checkers</h1>
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Even though the implicit checkers do not produce any warnings, they are used to
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support the analyzer core and model known APIs. See also
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<a href = "available_checks.html">Default Checkers</a>
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and <a href = "alpha_checks.html">Experimental (Alpha) Checkers</a>.
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<ul>
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<li><a href="#core_implicit_checkers">Core Implicit Checkers</a></li>
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<li><a href="#osx_implicit_checkers">OS X Implicit Checkers</a></li>
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</ul>
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<!------------------------------- core implicit ------------------------------->
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<h3 id="core_implicit_checkers">Core Implicit Checkers</h3>
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<table class="checkers">
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<colgroup><col class="namedescr"><col class="example"></colgroup>
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<thead><tr><td>Name, Description</td><td>Example</td></tr></thead>
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<tbody>
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<tr><td><div class="namedescr expandable"><span class="name">
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core.DynamicTypePropagation</span><span class="lang">
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(C++, ObjC)</span><div class="descr">
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Generate dynamic type information.</div></div></td>
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<td><div class="exampleContainer expandable">
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<div class="example"><pre>
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// C++
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class A {
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public:
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A(int x) {}
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virtual int foo();
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};
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class B: public A {
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public:
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B()
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:A(foo())
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// DynamicTypeInfo for 'this' rigion will wrap type 'A'
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// unless the base constructor call expression is processed
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{}
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virtual int foo();
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};
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</pre></div><div class="separator"></div>
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<div class="example"><pre>
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// Objective-C
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@interface MyClass : NSObject {}
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@end
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@implementation MyClass
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+ (void)foo {
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MyClass *x = [[self alloc] init];
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// DynamicTypeInfo from a cast: from 'id' to 'MyClass *'
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}
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@end
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void test() {
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MyClass *x = [MyClass alloc];
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// DynamicTypeInfo from a call to alloc:
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// from 'id' to 'MyClass *'
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}
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</pre></div></div></td></tr>
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<tr><td><div class="namedescr expandable"><span class="name">
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core.builtin.BuiltinFunctions</span><span class="lang">
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(C)</span><div class="descr">
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Evaluate compiler builtin functions (e.g., <code>alloca()</code>)</div></div></td>
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<td><div class="exampleContainer expandable">
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<div class="example"><pre>
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void test(int x) {
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int *p = (int *)__builtin_alloca(8);
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// evaluates to AllocaRegion
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if(__builtin_expect(x > 10, 0)) // evaluates to 'x > 10'
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x = 0;
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}
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</pre></div></div></td></tr>
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<tr><td><div class="namedescr expandable"><span class="name">
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core.builtin.NoReturnFunctions</span><span class="lang">
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(C, ObjC)</span><div class="descr">
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Evaluate "panic" functions that are known to not return to the caller.</div></div></td>
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<td><div class="exampleContainer expandable">
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<div class="example"><pre>
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// C
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void test() {
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panic(); // generate sink
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}
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</pre></div><div class="separator"></div>
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<div class="example"><pre>
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// Objective-C
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@interface MyObj : NSObject {}
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- (void)foo;
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@end
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@implementation MyObj
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- (void)foo {
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[[NSAssertionHandler currentHandler] handleFailureInMethod:_cmd
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object:self
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file:(@"somefile.m")
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lineNumber:1
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description:(@"some text")];
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// generate sink
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}
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@end
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</pre></div></div></td></tr>
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</tbody></table>
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<!---------------------------- OS X implicit ---------------------------------->
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<h3 id="osx_implicit_checkers">OS X Implicit Checkers</h3>
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<table class="checkers">
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<colgroup><col class="namedescr"><col class="example"></colgroup>
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<thead><tr><td>Name, Description</td><td>Example</td></tr></thead>
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<tbody>
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<tr><td><div class="namedescr expandable"><span class="name">
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osx.cocoa.Loops</span><span class="lang">
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(ObjC)</span><div class="descr">
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Improved modeling of loops using Cocoa collection types.</div></div></td>
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<td><div class="exampleContainer expandable">
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<div class="example"><pre>
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void test() {
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id x;
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for (x in [NSArray testObject]) {
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// assume the value of 'x' is non-nil
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}
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}
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</pre></div></div></td></tr>
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<tr><td><div class="namedescr expandable"><span class="name">
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osx.cocoa.NonNilReturnValue</span><span class="lang">
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(ObjC)</span><div class="descr">
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Model the APIs that are guaranteed to return a non-nil value.</div></div></td>
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<td><div class="exampleContainer expandable">
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<div class="example"><pre>
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void test(NSArray *A) {
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id subscriptObj = A[1]; // assume the value is non-nil
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}
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</pre></div></div></td></tr>
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</tbody></table>
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</div> <!-- page -->
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</div> <!-- content -->
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</body>
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</html>
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