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