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Add a mention of TypeBuilder to the programmer's manual, and clean up the class

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comment a bit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jeffrey Yasskin 2009-04-30 22:33:41 +00:00
parent 3a155f0e34
commit 714257f5de
2 changed files with 47 additions and 6 deletions
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41
docs/ProgrammersManual.html
View File

@ -117,6 +117,7 @@ with another <tt>Value</tt></a> </li>
<li><a href="#schanges_deletingGV">Deleting <tt>GlobalVariable</tt>s</a> </li>
</ul>
</li>
<li><a href="#create_types">How to Create Types</a></li>
<!--
<li>Working with the Control Flow Graph
<ul>
@ -2088,6 +2089,46 @@ GV-&gt;eraseFromParent();
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="create_types">How to Create Types</a>
</div>
<div class="doc_text">
<p>In generating IR, you may need some complex types. If you know these types
statically, you can use <tt>TypeBuilder&lt;...>::get()</tt>, defined
in <tt>llvm/Support/TypeBuilder.h</tt>, to retrieve them. <tt>TypeBuilder</tt>
has two forms depending on whether you're building types for cross-compilation
or native library use. <tt>TypeBuilder&lt;T, true></tt> requires
that <tt>T</tt> be independent of the host environment, meaning that it's built
out of types from
the <a href="/doxygen/namespacellvm_1_1types.html"><tt>llvm::types</tt></a>
namespace and pointers, functions, arrays, etc. built of
those. <tt>TypeBuilder&lt;T, false></tt> additionally allows native C types
whose size may depend on the host compiler. For example,</p>
<div class="doc_code">
<pre>
FunctionType *ft = TypeBuilder&lt;types::i&lt;8>(types::i&lt;32>*), true>::get();
</pre>
</div>
<p>is easier to read and write than the equivalent</p>
<div class="doc_code">
<pre>
std::vector<const Type*> params;
params.push_back(PointerType::getUnqual(Type::Int32Ty));
FunctionType *ft = FunctionType::get(Type::Int8Ty, params, false);
</pre>
</div>
<p>See the <a href="/doxygen/TypeBuilder_8h-source.html#l00001">class
comment</a> for more details.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="advanced">Advanced Topics</a>

12
include/llvm/Support/TypeBuilder.h
View File

@ -40,21 +40,21 @@ namespace llvm {
/// int8 AFunction(struct MyType *value);
///
/// You'll want to use
/// Function::Create(TypeBuilder<types::i<8>(MyType*)>::get(), ...)
/// Function::Create(TypeBuilder<types::i<8>(MyType*), true>::get(), ...)
/// to declare the function, but when you first try this, your compiler will
/// complain that TypeBuilder<MyType>::get() doesn't exist. To fix this, write:
/// complain that TypeBuilder<MyType, true>::get() doesn't exist. To fix this,
/// write:
///
/// namespace llvm {
/// using types::i;
/// template<bool xcompile> class TypeBuilder<MyType, xcompile> {
/// public:
/// static const StructType *get() {
/// // Using the static result variable ensures that the type is
/// // only looked up once.
/// static const StructType *const result = StructType::get(
/// TypeBuilder<i<32>, xcompile>::get(),
/// TypeBuilder<i<32>*, xcompile>::get(),
/// TypeBuilder<i<8>*[], xcompile>::get(),
/// TypeBuilder<types::i<32>, xcompile>::get(),
/// TypeBuilder<types::i<32>*, xcompile>::get(),
/// TypeBuilder<types::i<8>*[], xcompile>::get(),
/// NULL);
/// return result;
/// }