[PATCH] D110079: [llvm-profgen] An option to dump disasm of specified symbols

[Hongtao Yu via Phabricator via llvm-commits]

hoy created this revision.
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For large app, dumping disasm of the whole program can be slow and result in gianant output. Adding a switch to dump specific symbols only.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110079

Files:
  llvm/test/tools/llvm-profgen/pseudoprobe-decoding.test
  llvm/tools/llvm-profgen/ProfiledBinary.cpp
  llvm/tools/llvm-profgen/ProfiledBinary.h


Index: llvm/tools/llvm-profgen/ProfiledBinary.h
===================================================================
--- llvm/tools/llvm-profgen/ProfiledBinary.h
+++ llvm/tools/llvm-profgen/ProfiledBinary.h
@@ -185,6 +185,9 @@
   // String table owning function name strings created from the symbolizer.
   std::unordered_set<std::string> NameStrings;
 
+  // A collection of symbols to print disassembly for.
+  StringSet<> ShowSymbolSet;
+
   // Pseudo probe decoder
   MCPseudoProbeDecoder ProbeDecoder;
 
Index: llvm/tools/llvm-profgen/ProfiledBinary.cpp
===================================================================
--- llvm/tools/llvm-profgen/ProfiledBinary.cpp
+++ llvm/tools/llvm-profgen/ProfiledBinary.cpp
@@ -38,6 +38,11 @@
     "show-pseudo-probe", cl::ReallyHidden, cl::init(false), cl::ZeroOrMore,
     cl::desc("Print pseudo probe section and disassembled info."));
 
+static cl::list<std::string> ShowSymbols(
+    "show-symbols", cl::CommaSeparated,
+    cl::desc("List of symbols to print disassembly for. Accept demangled "
+             "names only. Only work with show-disassembly-only"));
+
 namespace llvm {
 namespace sampleprof {
 
@@ -298,7 +303,10 @@
       ShowCanonicalFnName
           ? FunctionSamples::getCanonicalFnName(Symbols[SI].Name)
           : Symbols[SI].Name;
-  if (ShowDisassemblyOnly)
+  bool ShowDisassembly =
+      ShowDisassemblyOnly &&
+      (ShowSymbolSet.empty() || ShowSymbolSet.count(SymbolName));
+  if (ShowDisassembly)
     outs() << '<' << SymbolName << ">:\n";
 
   auto WarnInvalidInsts = [](uint64_t Start, uint64_t End) {
@@ -321,7 +329,7 @@
     if (Size == 0)
       Size = 1;
 
-    if (ShowDisassemblyOnly) {
+    if (ShowDisassembly) {
       if (ShowPseudoProbe) {
         ProbeDecoder.printProbeForAddress(outs(),
                                           Offset + getPreferredBaseAddress());
@@ -385,7 +393,7 @@
   if (InvalidInstLength)
     WarnInvalidInsts(Offset - InvalidInstLength, Offset - 1);
 
-  if (ShowDisassemblyOnly)
+  if (ShowDisassembly)
     outs() << "\n";
 
   FuncStartAddrMap[StartOffset] = Symbols[SI].Name.str();
@@ -452,6 +460,8 @@
   for (std::pair<const SectionRef, SectionSymbolsTy> &SecSyms : AllSymbols)
     stable_sort(SecSyms.second);
 
+  ShowSymbolSet.insert(ShowSymbols.begin(), ShowSymbols.end());
+
   if (ShowDisassemblyOnly)
     outs() << "\nDisassembly of " << FileName << ":\n";
 
Index: llvm/test/tools/llvm-profgen/pseudoprobe-decoding.test
===================================================================
--- llvm/test/tools/llvm-profgen/pseudoprobe-decoding.test
+++ llvm/test/tools/llvm-profgen/pseudoprobe-decoding.test
@@ -1,4 +1,5 @@
 ; RUN: llvm-profgen --format=text --perfscript=%s  --binary=%S/Inputs/inline-cs-pseudoprobe.perfbin --output=%t --show-pseudo-probe --show-disassembly-only | FileCheck %s
+; RUN: llvm-profgen --format=text --perfscript=%s  --binary=%S/Inputs/inline-cs-pseudoprobe.perfbin --output=%t --show-pseudo-probe --show-disassembly-only --show-symbols=main,foo  | FileCheck %s -check-prefix=SYM
 
 PERF_RECORD_MMAP2 2854748/2854748: [0x400000(0x1000) @ 0 00:1d 123291722 526021]: r-xp /home/inline-cs-pseudoprobe.perfbin
 
@@ -79,6 +80,11 @@
 ; CHECK:       [Probe]: FUNC: foo Index: 9  Type: DirectCall  Inlined: @ main:2
 ; CHECK-NEXT:      865: callq 0x930
 
+; SYM-NOT: <bar>:
+; SYM: <foo>:
+; SYM: <main>:
+
+
 
 ; clang -O3 -fexperimental-new-pass-manager -fuse-ld=lld -fpseudo-probe-for-profiling
 ; -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Xclang -mdisable-tail-calls


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