forked from OSchip/llvm-project
306 lines
8.6 KiB
ReStructuredText
306 lines
8.6 KiB
ReStructuredText
llvm-bcanalyzer - LLVM bitcode analyzer
|
|
=======================================
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
:program:`llvm-bcanalyzer` [*options*] [*filename*]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
The :program:`llvm-bcanalyzer` command is a small utility for analyzing bitcode
|
|
files. The tool reads a bitcode file (such as generated with the
|
|
:program:`llvm-as` tool) and produces a statistical report on the contents of
|
|
the bitcode file. The tool can also dump a low level but human readable
|
|
version of the bitcode file. This tool is probably not of much interest or
|
|
utility except for those working directly with the bitcode file format. Most
|
|
LLVM users can just ignore this tool.
|
|
|
|
If *filename* is omitted or is ``-``, then :program:`llvm-bcanalyzer` reads its
|
|
input from standard input. This is useful for combining the tool into a
|
|
pipeline. Output is written to the standard output.
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
.. program:: llvm-bcanalyzer
|
|
|
|
.. option:: -nodetails
|
|
|
|
Causes :program:`llvm-bcanalyzer` to abbreviate its output by writing out only
|
|
a module level summary. The details for individual functions are not
|
|
displayed.
|
|
|
|
.. option:: -dump
|
|
|
|
Causes :program:`llvm-bcanalyzer` to dump the bitcode in a human readable
|
|
format. This format is significantly different from LLVM assembly and
|
|
provides details about the encoding of the bitcode file.
|
|
|
|
.. option:: -verify
|
|
|
|
Causes :program:`llvm-bcanalyzer` to verify the module produced by reading the
|
|
bitcode. This ensures that the statistics generated are based on a consistent
|
|
module.
|
|
|
|
.. option:: -help
|
|
|
|
Print a summary of command line options.
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
|
|
If :program:`llvm-bcanalyzer` succeeds, it will exit with 0. Otherwise, if an
|
|
error occurs, it will exit with a non-zero value, usually 1.
|
|
|
|
SUMMARY OUTPUT DEFINITIONS
|
|
--------------------------
|
|
|
|
The following items are always printed by llvm-bcanalyzer. They comprize the
|
|
summary output.
|
|
|
|
**Bitcode Analysis Of Module**
|
|
|
|
This just provides the name of the module for which bitcode analysis is being
|
|
generated.
|
|
|
|
**Bitcode Version Number**
|
|
|
|
The bitcode version (not LLVM version) of the file read by the analyzer.
|
|
|
|
**File Size**
|
|
|
|
The size, in bytes, of the entire bitcode file.
|
|
|
|
**Module Bytes**
|
|
|
|
The size, in bytes, of the module block. Percentage is relative to File Size.
|
|
|
|
**Function Bytes**
|
|
|
|
The size, in bytes, of all the function blocks. Percentage is relative to File
|
|
Size.
|
|
|
|
**Global Types Bytes**
|
|
|
|
The size, in bytes, of the Global Types Pool. Percentage is relative to File
|
|
Size. This is the size of the definitions of all types in the bitcode file.
|
|
|
|
**Constant Pool Bytes**
|
|
|
|
The size, in bytes, of the Constant Pool Blocks Percentage is relative to File
|
|
Size.
|
|
|
|
**Module Globals Bytes**
|
|
|
|
Ths size, in bytes, of the Global Variable Definitions and their initializers.
|
|
Percentage is relative to File Size.
|
|
|
|
**Instruction List Bytes**
|
|
|
|
The size, in bytes, of all the instruction lists in all the functions.
|
|
Percentage is relative to File Size. Note that this value is also included in
|
|
the Function Bytes.
|
|
|
|
**Compaction Table Bytes**
|
|
|
|
The size, in bytes, of all the compaction tables in all the functions.
|
|
Percentage is relative to File Size. Note that this value is also included in
|
|
the Function Bytes.
|
|
|
|
**Symbol Table Bytes**
|
|
|
|
The size, in bytes, of all the symbol tables in all the functions. Percentage is
|
|
relative to File Size. Note that this value is also included in the Function
|
|
Bytes.
|
|
|
|
**Dependent Libraries Bytes**
|
|
|
|
The size, in bytes, of the list of dependent libraries in the module. Percentage
|
|
is relative to File Size. Note that this value is also included in the Module
|
|
Global Bytes.
|
|
|
|
**Number Of Bitcode Blocks**
|
|
|
|
The total number of blocks of any kind in the bitcode file.
|
|
|
|
**Number Of Functions**
|
|
|
|
The total number of function definitions in the bitcode file.
|
|
|
|
**Number Of Types**
|
|
|
|
The total number of types defined in the Global Types Pool.
|
|
|
|
**Number Of Constants**
|
|
|
|
The total number of constants (of any type) defined in the Constant Pool.
|
|
|
|
**Number Of Basic Blocks**
|
|
|
|
The total number of basic blocks defined in all functions in the bitcode file.
|
|
|
|
**Number Of Instructions**
|
|
|
|
The total number of instructions defined in all functions in the bitcode file.
|
|
|
|
**Number Of Long Instructions**
|
|
|
|
The total number of long instructions defined in all functions in the bitcode
|
|
file. Long instructions are those taking greater than 4 bytes. Typically long
|
|
instructions are GetElementPtr with several indices, PHI nodes, and calls to
|
|
functions with large numbers of arguments.
|
|
|
|
**Number Of Operands**
|
|
|
|
The total number of operands used in all instructions in the bitcode file.
|
|
|
|
**Number Of Compaction Tables**
|
|
|
|
The total number of compaction tables in all functions in the bitcode file.
|
|
|
|
**Number Of Symbol Tables**
|
|
|
|
The total number of symbol tables in all functions in the bitcode file.
|
|
|
|
**Number Of Dependent Libs**
|
|
|
|
The total number of dependent libraries found in the bitcode file.
|
|
|
|
**Total Instruction Size**
|
|
|
|
The total size of the instructions in all functions in the bitcode file.
|
|
|
|
**Average Instruction Size**
|
|
|
|
The average number of bytes per instruction across all functions in the bitcode
|
|
file. This value is computed by dividing Total Instruction Size by Number Of
|
|
Instructions.
|
|
|
|
**Maximum Type Slot Number**
|
|
|
|
The maximum value used for a type's slot number. Larger slot number values take
|
|
more bytes to encode.
|
|
|
|
**Maximum Value Slot Number**
|
|
|
|
The maximum value used for a value's slot number. Larger slot number values take
|
|
more bytes to encode.
|
|
|
|
**Bytes Per Value**
|
|
|
|
The average size of a Value definition (of any type). This is computed by
|
|
dividing File Size by the total number of values of any type.
|
|
|
|
**Bytes Per Global**
|
|
|
|
The average size of a global definition (constants and global variables).
|
|
|
|
**Bytes Per Function**
|
|
|
|
The average number of bytes per function definition. This is computed by
|
|
dividing Function Bytes by Number Of Functions.
|
|
|
|
**# of VBR 32-bit Integers**
|
|
|
|
The total number of 32-bit integers encoded using the Variable Bit Rate
|
|
encoding scheme.
|
|
|
|
**# of VBR 64-bit Integers**
|
|
|
|
The total number of 64-bit integers encoded using the Variable Bit Rate encoding
|
|
scheme.
|
|
|
|
**# of VBR Compressed Bytes**
|
|
|
|
The total number of bytes consumed by the 32-bit and 64-bit integers that use
|
|
the Variable Bit Rate encoding scheme.
|
|
|
|
**# of VBR Expanded Bytes**
|
|
|
|
The total number of bytes that would have been consumed by the 32-bit and 64-bit
|
|
integers had they not been compressed with the Variable Bit Rage encoding
|
|
scheme.
|
|
|
|
**Bytes Saved With VBR**
|
|
|
|
The total number of bytes saved by using the Variable Bit Rate encoding scheme.
|
|
The percentage is relative to # of VBR Expanded Bytes.
|
|
|
|
DETAILED OUTPUT DEFINITIONS
|
|
---------------------------
|
|
|
|
The following definitions occur only if the -nodetails option was not given.
|
|
The detailed output provides additional information on a per-function basis.
|
|
|
|
**Type**
|
|
|
|
The type signature of the function.
|
|
|
|
**Byte Size**
|
|
|
|
The total number of bytes in the function's block.
|
|
|
|
**Basic Blocks**
|
|
|
|
The number of basic blocks defined by the function.
|
|
|
|
**Instructions**
|
|
|
|
The number of instructions defined by the function.
|
|
|
|
**Long Instructions**
|
|
|
|
The number of instructions using the long instruction format in the function.
|
|
|
|
**Operands**
|
|
|
|
The number of operands used by all instructions in the function.
|
|
|
|
**Instruction Size**
|
|
|
|
The number of bytes consumed by instructions in the function.
|
|
|
|
**Average Instruction Size**
|
|
|
|
The average number of bytes consumed by the instructions in the function.
|
|
This value is computed by dividing Instruction Size by Instructions.
|
|
|
|
**Bytes Per Instruction**
|
|
|
|
The average number of bytes used by the function per instruction. This value
|
|
is computed by dividing Byte Size by Instructions. Note that this is not the
|
|
same as Average Instruction Size. It computes a number relative to the total
|
|
function size not just the size of the instruction list.
|
|
|
|
**Number of VBR 32-bit Integers**
|
|
|
|
The total number of 32-bit integers found in this function (for any use).
|
|
|
|
**Number of VBR 64-bit Integers**
|
|
|
|
The total number of 64-bit integers found in this function (for any use).
|
|
|
|
**Number of VBR Compressed Bytes**
|
|
|
|
The total number of bytes in this function consumed by the 32-bit and 64-bit
|
|
integers that use the Variable Bit Rate encoding scheme.
|
|
|
|
**Number of VBR Expanded Bytes**
|
|
|
|
The total number of bytes in this function that would have been consumed by
|
|
the 32-bit and 64-bit integers had they not been compressed with the Variable
|
|
Bit Rate encoding scheme.
|
|
|
|
**Bytes Saved With VBR**
|
|
|
|
The total number of bytes saved in this function by using the Variable Bit
|
|
Rate encoding scheme. The percentage is relative to # of VBR Expanded Bytes.
|
|
|
|
SEE ALSO
|
|
--------
|
|
|
|
:doc:`/CommandGuide/llvm-dis`, :doc:`/BitCodeFormat`
|
|
|