[symbolizer] Support symbol lookup

Recent versions of GNU binutils starting from 2.39 support symbol+offset
lookup in addition to the usual numeric address lookup. This change adds
symbol lookup to llvm-symbolize and llvm-addr2line.

Now llvm-symbolize behaves closer to GNU addr2line, - if the value specified
as address in command line or input stream is not a number, it is treated as
a symbol name. For example:

    llvm-symbolize --obj=abc.so func_22
    llvm-symbolize --obj=abc.so "CODE func_22"

This lookup is now supported only for functions. Specification with
offset is not supported yet.

This is a recommit of 2b27948783e4bbc1132d3220d8517ef62607b558, reverted
in 39fec5457c0925bd39f67f63fe17391584e08258 because the test
llvm/test/Support/interrupts.test started failing on Windows. The test was
changed in 18f036d0105589c3175bb51a518c5d272dae61e2 and is also updated in
this commit.

Differential Revision: https://reviews.llvm.org/D149759

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/Symbolize/SymbolizableObjectFile.cpp b/llvm/lib/DebugInfo/Symbolize/SymbolizableObjectFile.cpp
index 6b8068a..6973030 100644
--- a/llvm/lib/DebugInfo/Symbolize/SymbolizableObjectFile.cpp
+++ b/llvm/lib/DebugInfo/Symbolize/SymbolizableObjectFile.cpp
@@ -351,6 +351,19 @@ std::vector<DILocal> SymbolizableObjectFile::symbolizeFrame(
   return DebugInfoContext->getLocalsForAddress(ModuleOffset);
 }
 
+std::vector<object::SectionedAddress>
+SymbolizableObjectFile::findSymbol(StringRef Symbol) const {
+  std::vector<object::SectionedAddress> Result;
+  for (const SymbolDesc &Sym : Symbols) {
+    if (Sym.Name.equals(Symbol)) {
+      object::SectionedAddress A{Sym.Addr,
+                                 getModuleSectionIndexForAddress(Sym.Addr)};
+      Result.push_back(A);
+    }
+  }
+  return Result;
+}
+
 /// Search for the first occurence of specified Address in ObjectFile.
 uint64_t SymbolizableObjectFile::getModuleSectionIndexForAddress(
     uint64_t Address) const {