LTO Dump Tool Project
The purpose of this dump tool is to analyze the LTO object files.
Link to Repository
The LTO object file is a regular elf file with sections containing LTO byte-code. A LTO object file contains various sections for storing command line options, symbol table, global declarations and types, function bodies in GIMPLE, call graph, etc. There are couple of limitations of the byte code format: 1] It is not self descriptive, which makes it harder to debug. 2] The byte code is essentially a “serialized” version of in-memory representations, which makes it prone to break across versions. The purpose of this project is to create a dump tool for easily analyzing LTO object files similar to readelf or objdump -d for regular elf object files.
Command line options added in the dumping infrastructure are:
|Command Line option||Function|
|-list||Dumps list of details of functions and variables.|
|-demangle||Dump the demangled output.|
|-defined-only||Dump only the defined symbols.|
|-print-value||Dump initial values of the variables.|
|-name-sort||Sort the symbols alphabetically.|
|-size-sort||Sort the symbols according to size.|
|-reverse-sort||Dump the symbols in reverse order.|
|-no-sort||Dump the symbols in order of occurence.|
|-symbol=||Dump the details of specific symbol.|
|-objects=||Dump the details of LTO objects.|
|-type-stats||Dump the statistics of tree types.|
|-tree-stats||Dump the statistics of trees.|
|-gimple-stats||Dump the statistics of gimple statements.|
|-dump-level=||For deciding the optimization level of body.|
|-dump-body=||Dump the specific gimple body.|
|-help||Display the dump tool help.|
Links to commits:
Created seperate LTO dump tool.
Created command line option for dumping symbol list.
Created command line option for dumping detail information of specified symbol.
Created command line option for dumping details of LTO objects.
Created command line option for dumping tree type statistics.
Created command line option for dumping GIMPLE and TREE statistics.
Added command line options to dump specific optimized body of specified function.
Changes for refactoring.
Incorporated feedback part 1 and 2.
Incorporated feedback part 3 and 4.
lto_main comment added.
Documentation and corrections.
Improvements in documentation.
Improvements in refactoring.