[PATCH] D34080: [ThinLTO] Add dump-summary command to llvm-lto2 tool

[David Blaikie via llvm-commits]

How does this relate to the other patch, D34063? (trying to understand
which pieces do what, etc)

That said, I'd really like to go back & have a discussion about whether
this is all the right direction, given a desire/need to have .ll
consistency with .bc files (ie: a roundtrippable representation of
summaries in .ll files).

- Dave

On Sat, Jun 10, 2017 at 7:47 AM Charles Saternos via Phabricator via
llvm-commits <llvm-commits at lists.llvm.org> wrote:

> ncharlie created this revision.
> Herald added subscribers: inglorion, Prazek.
>
> [ThinLTO] Add dump-summary command to llvm-lto2 tool
>
> Adds command to dump ThinLTO module summaries in YAML to the llvm-lto2
> tool.
>
>
> https://reviews.llvm.org/D34080
>
> Files:
>   test/tools/llvm-lto2/X86/dump-summary.ll
>   tools/llvm-lto2/llvm-lto2.cpp
>
>
> Index: tools/llvm-lto2/llvm-lto2.cpp
> ===================================================================
> --- tools/llvm-lto2/llvm-lto2.cpp
> +++ tools/llvm-lto2/llvm-lto2.cpp
> @@ -16,9 +16,11 @@
>  //
>
>  //===----------------------------------------------------------------------===//
>
> -#include "llvm/LTO/Caching.h"
> +#include "llvm/Bitcode/BitcodeReader.h"
>  #include "llvm/CodeGen/CommandFlags.h"
>  #include "llvm/IR/DiagnosticPrinter.h"
> +#include "llvm/IR/ModuleSummaryIndexYAML.h"
> +#include "llvm/LTO/Caching.h"
>  #include "llvm/LTO/LTO.h"
>  #include "llvm/Support/CommandLine.h"
>  #include "llvm/Support/FileSystem.h"
> @@ -132,7 +134,7 @@
>  }
>
>  static int usage() {
> -  errs() << "Available subcommands: dump-symtab run\n";
> +  errs() << "Available subcommands: dump-symtab dump-summary run\n";
>    return 1;
>  }
>
> @@ -351,6 +353,19 @@
>    return 0;
>  }
>
> +static int dumpSummary(int argc, char **argv) {
> +  for (StringRef F : make_range(argv + 1, argv + argc)) {
> +    std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
> +    std::unique_ptr<ModuleSummaryIndex> Index =
> +        check(getModuleSummaryIndex(*MB), F);
> +
> +    yaml::Output Out(outs());
> +    Out << *Index;
> +  }
> +
> +  return 0;
> +}
> +
>  int main(int argc, char **argv) {
>    InitializeAllTargets();
>    InitializeAllTargetMCs();
> @@ -368,6 +383,8 @@
>    argv[1] = argv[0];
>    if (Subcommand == "dump-symtab")
>      return dumpSymtab(argc - 1, argv + 1);
> +  if (Subcommand == "dump-summary")
> +    return dumpSummary(argc - 1, argv + 1);
>    if (Subcommand == "run")
>      return run(argc - 1, argv + 1);
>    return usage();
> Index: test/tools/llvm-lto2/X86/dump-summary.ll
> ===================================================================
> --- /dev/null
> +++ test/tools/llvm-lto2/X86/dump-summary.ll
> @@ -0,0 +1,17 @@
> +; RUN: opt -module-summary %s -o %t.o
> +; RUN: llvm-lto2 dump-summary %t.o | egrep 'Linkage:\s+0'
> +; RUN: llvm-lto2 dump-summary %t.o | egrep 'Live:\s+false'
> +; RUN: llvm-lto2 dump-summary %t.o | egrep 'NotEligibleToImport:\s+false'
> +
> +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
> +target triple = "x86_64-unknown-linux-gnu"
> + at G = constant i32 2048, align 4
> + at a = weak alias i32, i32* @G
> +
> +define void @boop() {
> +  tail call void @afun()
> +  ret void
> +}
> +
> +declare void @afun()
> +declare void @testtest()
>
>
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