diff options
| author | Eric Christopher <echristo@apple.com> | 2009-12-23 00:29:49 +0000 |
|---|---|---|
| committer | Eric Christopher <echristo@apple.com> | 2009-12-23 00:29:49 +0000 |
| commit | 8295a0a991c3910e37fa2f20f45973d40f7034af (patch) | |
| tree | aeb2e3c96c97164908a9fb8ced0f69229d7d76c2 /docs | |
| parent | 775db97a50fb56fece6fbd68e1a6f86418e8063a (diff) | |
Update docs for bitcode changes. For object size checking we won't
work with partial objects so just count the type as a boolean. Update
appropriately.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91954 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.html | 35 |
1 files changed, 8 insertions, 27 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index 45f6f38f59..526f119a62 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -7257,8 +7257,8 @@ LLVM</a>.</p> <h5>Syntax:</h5> <pre> - declare i32 @llvm.objectsize.i32( i8* <ptr>, i32 <type> ) - declare i64 @llvm.objectsize.i64( i8* <ptr>, i32 <type> ) + declare i32 @llvm.objectsize.i32( i8* <object>, i1 <type> ) + declare i64 @llvm.objectsize.i64( i8* <object>, i1 <type> ) </pre> <h5>Overview:</h5> @@ -7267,34 +7267,15 @@ LLVM</a>.</p> operation like memcpy will either overflow a buffer that corresponds to an object, or b) to determine that a runtime check for overflow isn't necessary. An object in this context means an allocation of a - specific <a href="#typesystem">type</a>.</p> + specific class, structure, array, or other object.</p> <h5>Arguments:</h5> <p>The <tt>llvm.objectsize</tt> intrinsic takes two arguments. The first - argument is a pointer to the object <tt>ptr</tt>. The second argument - is an integer <tt>type</tt> which ranges from 0 to 3. The first bit in - the type corresponds to a return value based on whole objects, - and the second bit whether or not we return the maximum or minimum - remaining bytes computed.</p> -<table class="layout"> - <tr class="layout"> - <td class="left"><tt>00</tt></td> - <td class="left">whole object, maximum number of bytes</td> - </tr> - <tr class="layout"> - <td class="left"><tt>01</tt></td> - <td class="left">partial object, maximum number of bytes</td> - </tr> - <tr class="layout"> - <td class="left"><tt>10</tt></td> - <td class="left">whole object, minimum number of bytes</td> - </tr> - <tr class="layout"> - <td class="left"><tt>11</tt></td> - <td class="left">partial object, minimum number of bytes</td> - </tr> -</table> - + argument is a pointer to or into the <tt>object</tt>. The second argument + is a boolean 0 or 1. This argument determines whether you want the + maximum (0) or minimum (1) bytes remaining. This needs to be a literal 0 or + 1, variables are not allowed.</p> + <h5>Semantics:</h5> <p>The <tt>llvm.objectsize</tt> intrinsic is lowered to either a constant representing the size of the object concerned or <tt>i32/i64 -1 or 0</tt> |