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Documentation: llvm-bcanalyzer.rst: cleanup.

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