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Add support for range expressions in TableGen foreach loops.

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Like this:

  foreach i = 0-127 in ...

Use braces for composite ranges:

  foreach i = {0-3,9-7} in ...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157432 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-05-24 22:17:39 +00:00
parent 72cba6cdf6
commit fae8b1de47
3 changed files with 77 additions and 19 deletions
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8
docs/TableGenFundamentals.html
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@@ -402,14 +402,18 @@ which case the user must specify it explicitly.</dd>
<dt><tt>list[4-7,17,2-3]</tt></dt>
<dd>A slice of the 'list' list, including elements 4,5,6,7,17,2, and 3 from
it. Elements may be included multiple times.</dd>
<dt><tt>foreach &lt;var&gt; = &lt;list&gt; in { &lt;body&gt; }</tt></dt>
<dt><tt>foreach &lt;var&gt; = &lt;list&gt; in &lt;def&gt;</tt></dt>
<dt><tt>foreach &lt;var&gt; = [ &lt;list&gt; ] in { &lt;body&gt; }</tt></dt>
<dt><tt>foreach &lt;var&gt; = [ &lt;list&gt; ] in &lt;def&gt;</tt></dt>
<dd> Replicate &lt;body&gt; or &lt;def&gt;, replacing instances of
&lt;var&gt; with each value in &lt;list&gt;. &lt;var&gt; is scoped at the
level of the <tt>foreach</tt> loop and must not conflict with any other object
introduced in &lt;body&gt; or &lt;def&gt;. Currently only <tt>def</tt>s are
expanded within &lt;body&gt;.
</dd>
<dt><tt>foreach &lt;var&gt; = 0-15 in ...</tt></dt>
<dt><tt>foreach &lt;var&gt; = {0-15,32-47} in ...</tt></dt>
<dd>Loop over ranges of integers. The braces are required for multiple
ranges.</dd>
<dt><tt>(DEF a, b)</tt></dt>
<dd>a dag value. The first element is required to be a record definition, the
remaining elements in the list may be arbitrary other values, including nested