Add addr2line aliases for symbolizer

[khemant]

Summary

Add -i for -inlining, -C for demangler and -e for -obj option.

[emaste]

FWIW, as far as I can tell binutils addr2line spells the long versions of these as --inlines, --demangle, --exe, and ELF Tool Chain addr2line does too (but does not support -i). Should we have those as aliases as well?

[khemant]

Sure. We could add them.

[samsonov]

First of all, what is your use case?

I have a minor concern about adding these aliases: I'm not sure that merging command line options would work for LLVM tools. So, for instance, you won't be able to write llvm-symbolizer -Cfi as you can write addr2line -Cfi, so we will not have drop-in replacement anyway.

Also, please update the docs.

test/DebugInfo/llvm-symbolizer.test

 RUN:    | FileCheck %s --check-prefix=SHORT_FUNCTION_NAME
 
 SHORT_FUNCTION_NAME-NOT: _Z1cv
+
+RUN: echo "%p/Inputs/dwarfdump-test4.elf-x86-64 0x62c" > %t.input7
+RUN: llvm-symbolizer --functions=short --use-symbol-table=false -C=false < %t.input7 \
+RUN:    | FileCheck %s --check-prefix=ALIAS_SHORT_FUNCTION_NAME
+
+ALIAS_SHORT_FUNCTION_NAME-NOT: _Z1cv
+
+RUN: echo "0x400559" > %t.input4
+RUN: echo "0x400436" >> %t.input4
+RUN: llvm-symbolizer -e %p/Inputs/dwarfdump-test.elf-x86-64 < %t.input4 \
+RUN:   | FileCheck %s --check-prefix=ALIAS_BINARY
+
+ALIAS_BINARY:       main
+ALIAS_BINARY-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test.cc:16
+ALIAS_BINARY:      _start

tools/llvm-symbolizer/llvm-symbolizer.cpp

     ClPrintInlining("inlining", cl::init(true),
                     cl::desc("Print all inlined frames for a given address"));
 
+static cl::alias ClAliasPrintInlining("i", cl::desc("alias for -inlining"),
+                                      cl::aliasopt(ClPrintInlining));
+
 static cl::opt<bool>
 ClDemangle("demangle", cl::init(true), cl::desc("Demangle function names"));
 
+static cl::alias ClAliasDemangle("C", cl::desc("alias for -demangle"),
+                                 cl::aliasopt(ClDemangle));
+
 static cl::opt<std::string> ClDefaultArch("default-arch", cl::init(""),
                                           cl::desc("Default architecture "
                                                    "(for multi-arch objects)"));

              cl::desc("Path to object file to be symbolized (if not provided, "
                       "object file should be specified for each input line)"));
 
+static cl::alias ClAliasBinaryName("e", cl::desc("alias for -obj"),
+                                   cl::aliasopt(ClBinaryName));
+
 static cl::list<std::string>
 ClDsymHint("dsym-hint", cl::ZeroOrMore,
            cl::desc("Path to .dSYM bundles to search for debug info for the "