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Run the verifier on generated code.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43327 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-10-25 04:30:35 +00:00
parent f92ff03f71
commit d9b8616c27
1 changed files with 23 additions and 6 deletions
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29
docs/tutorial/LangImpl3.html
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@ -400,10 +400,6 @@ last function we compiled.</p>
Builder.SetInsertPoint(BB);
if (Value *RetVal = Body-&gt;Codegen()) {
// Finish off the function.
Builder.CreateRet(RetVal);
return TheFunction;
}
</pre>
</div>
@ -417,12 +413,29 @@ href="http://en.wikipedia.org/wiki/Control_flow_graph">Control Flow Graph</a>.
Since we don't have any control flow, our functions will only contain one
block so far. We'll fix this in a future installment :).</p>
<div class="doc_code">
<pre>
if (Value *RetVal = Body-&gt;Codegen()) {
// Finish off the function.
Builder.CreateRet(RetVal);
// Validate the generated code, checking for consistency.
verifyFunction(*TheFunction);
return TheFunction;
}
</pre>
</div>
<p>Once the insertion point is set up, we call the <tt>CodeGen()</tt> method for
the root expression of the function. If no error happens, this emits code to
compute the expression into the entry block and returns the value that was
computed. Assuming no error, we then create an LLVM <a
href="../LangRef.html#i_ret">ret instruction</a>. This completes the function,
which is then returned.</p>
href="../LangRef.html#i_ret">ret instruction</a>, which completes the function.
Once the function is built, we call the <tt>verifyFunction</tt> function, which
is provided by LLVM. This function does a variety of consistency checks on the
generated code, to determine if our compiler is doing everything right. Using
this is important: it can catch a lot of bugs. Once the function is finished
and validated, we return it.</p>
<div class="doc_code">
<pre>
@ -625,6 +638,7 @@ our makefile/command line about which options to use:</p>
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Support/LLVMBuilder.h"
#include &lt;cstdio&gt;
#include &lt;string&gt;
@ -1071,6 +1085,9 @@ Function *FunctionAST::Codegen() {
if (Value *RetVal = Body-&gt;Codegen()) {
// Finish off the function.
Builder.CreateRet(RetVal);
// Validate the generated code, checking for consistency.
verifyFunction(*TheFunction);
return TheFunction;
}