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clarify why prototype::codegen returns a function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43725 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2007-11-05 19:22:50 +00:00
parent 99005a4b3b
commit cf9893d28c
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docs/tutorial/LangImpl3.html
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@ -293,7 +293,13 @@ Function *PrototypeAST::Codegen() {
</pre>
</div>
<p>This code packs a lot of power into a few lines. The first step is to create
<p>This code packs a lot of power into a few lines. Note first that this
function returns a Function* instead of a Value*. Because a "prototype" really
talks about the external interface for a function (not the value computed by
an expression), it makes sense for it to return the LLVM Function it corresponds
to when codegen'd.</p>
<p>The next step is to create
the <tt>FunctionType</tt> that should be used for a given Prototype. Since all
function arguments in Kaleidoscope are of type double, the first line creates
a vector of "N" LLVM Double types. It then uses the <tt>FunctionType::get</tt>