[PATCH] --print-html-after-all

[Lang Hames]

Hi Pete,

This looks really handy.

On the IO side I'd be inclined to go for a different scheme: Have the print
routines take a StructuredStreamWrapper that wraps an ostream, and then
define some stream operators. E.g:

class StructuredStreamWriter {
public:
  void visit(StructuredElement &E) { E.visit(*this); }

};



Cheers,
Lang.

On Wed, Jan 21, 2015 at 2:19 AM, Pete Cooper <peter_cooper at apple.com> wrote:

> Hi all
>
> I wanted to put this patch out to gauge interest.  It adds a new flag
> which behaves just like —print-after-all, but emits the IR with HTML
> structure.
>
> I’ve attached an example output using this command "llc
> --print-html-after-all test/CodeGen/X86/avx-shuffle-x86_32.ll -o /dev/null
> -O3 &> file.html”.  Note that ‘opt’ also works similarly.
>
> In this file you can see all of the passes LLVM ran, from IR, through
> selection DAG, and finally the MI passes.  For selection DAG, i made it
> aggregate all the BBs for each stage.  So you’ll see every BB in the
> initial DAG, then every BB in the legalized DAG and so on.
>
> Things you can interact with are:
> - Functions are all listed separately in a pull-down box so you can view
> one at a time
> - If you have some instructions/values highlighted you can choose to hide
> anything which isn’t highlighted.  This lets you focus on the
> instructions/values you’re interested in.
> - Instructions/SDNode's which aren’t greyed out will highlight all others
> with the same DebugLoc
> - IR values with names will highlight all others with the same name across
> all passes.  Same with vreg's
> - IR values with numbers will just highlight uses/defs in the pass you are
> looking at
> - SDNode’s are printed as N<#> and will only highlight uses/defs in the BB
> you are looking at
> - If you click on a use of a value, and non-highlited instructions are
> hidden, then the def will be made visible, along with the defining
> instruction/node.
>
> The code is quite large, but much of it involves feeding the
> HTMLStructuredPrinter, a new class, through the various print methods, and
> adding passes to emit the various constructs with HTML tags.  If there’s
> interest in landing this then I’m happy to discuss the implementation and
> split up the code in to multiple patches.  There’s also much more we could
> do in future, such as use hyperlinks to jump between BBs.
>
> Finally, i’m heavily reliant on a new HTML extension
> "-webkit-column-count” which i’ve only tested on Safari.  If this gets
> committed, i’d appreciate someone with HTML expertise to clean up that part
> of the code.
>
> Thanks,
> Pete
>
>
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