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318 lines
8.7 KiB
Plaintext
318 lines
8.7 KiB
Plaintext
=pod
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=head1 NAME
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llvm-bcanalyzer - LLVM bytecode analyzer
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=head1 SYNOPSIS
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B<llvm-bcanalyzer> [I<options>] [I<filename>]
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=head1 DESCRIPTION
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The B<llvm-bcanalyzer> command is a small utility for analyzing bytecode files.
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The tool reads a bytecode file (such as generated with the B<llvm-as> tool) and
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produces a statistical report on the contents of the byteocde file. The tool
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will also dump a low level but human readable version of the bytecode file.
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This tool is probably not of much interest or utility except for those working
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directly with the bytecode file format. Most LLVM users can just ignore
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this tool.
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If F<filename> is omitted or is C<->, then B<llvm-bcanalyzer> reads its input
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from standard input. This is useful for combining the tool into a pipeline.
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Output is written to the standard output.
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=head1 OPTIONS
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=over
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=item B<-nodetails>
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Causes B<llvm-bcanalyzer> to abbreviate its output by writing out only a module
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level summary. The details for individual functions are not displayed.
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=item B<-dump>
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Causes B<llvm-bcanalyzer> to dump the bytecode in a human readable format. This
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format is significantly different from LLVM assembly and provides details about
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the encoding of the bytecode file.
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=item B<-verify>
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Causes B<llvm-bcanalyzer> to verify the module produced by by reading the
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bytecode. This ensures that the statistics generated are based on a consistent
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module.
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=item B<--help>
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Print a summary of command line options.
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=back
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=head1 EXIT STATUS
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If B<llvm-bcanalyzer> succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non-zero value, usually 1.
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=head1 SUMMARY OUTPUT DEFINITIONS
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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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=over
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=item B<Bytecode Analysis Of Module>
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This just provides the name of the module for which bytecode analysis is being
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generated.
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=item B<Bytecode Version Number>
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The bytecode version (not LLVM version) of the file read by the analyzer.
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=item B<File Size>
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The size, in bytes, of the entire bytecode file.
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=item B<Module Bytes>
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The size, in bytes, of the module block. Percentage is relative to File Size.
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=item B<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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=item B<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 bytecode file.
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=item B<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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=item B<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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=item B<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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=item B<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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=item B<Compaction 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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=item B<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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=item B<Number Of Bytecode Blocks>
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The total number of blocks of any kind in the bytecode file.
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=item B<Number Of Functions>
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The total number of function definitions in the bytecode file.
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=item B<Number Of Types>
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The total number of types defined in the Global Types Pool.
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=item B<Number Of Constants>
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The total number of constants (of any type) defined in the Constant Pool.
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=item B<Number Of Basic Blocks>
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The total number of basic blocks defined in all functions in the bytecode file.
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=item B<Number Of Instructions>
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The total number of instructions defined in all functions in the bytecode file.
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=item B<Number Of Long Instructions>
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The total number of long instructions defined in all functions in the bytecode
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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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=item B<Number Of Operands>
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The total number of operands used in all instructions in the bytecode file.
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=item B<Number Of Compaction Tables>
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The total number of compaction tables in all functions in the bytecode file.
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=item B<Number Of Symbol Tables>
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The total number of symbol tables in all functions in the bytecode file.
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=item B<Number Of Dependent Libs>
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The total number of dependent libraries found in the bytecode file.
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=item B<Total Instruction Size>
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The total size of the instructions in all functions in the bytecode file.
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=item B<Average Instruction Size>
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The average number of bytes per instruction across all functions in the bytecode
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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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=item B<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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=item B<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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=item B<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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=item B<Bytes Per Global>
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The average size of a global definition (constants and global variables).
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=item B<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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=item B<# 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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=item B<# 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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=item B<# 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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=item B<# 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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=item B<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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=back
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=head1 DETAILED OUTPUT DEFINITIONS
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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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=over
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=item B<Type>
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The type signature of the function.
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=item B<Byte Size>
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The total number of bytes in the function's block.
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=item B<Basic Blocks>
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The number of basic blocks defined by the function.
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=item B<Instructions>
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The number of instructions defined by the function.
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=item B<Long Instructions>
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The number of instructions using the long instruction format in the function.
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=item B<Operands>
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The number of operands used by all instructions in the function.
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=item B<Instruction Size>
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The number of bytes consumed by instructions in the function.
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=item B<Average Instruction Size>
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The average number of bytes consumed by the instructions in the funtion. This
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value is computed by dividing Instruction Size by Instructions.
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=item B<Bytes Per Instruction>
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The average number of bytes used by the function per instruction. This value is
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computed by dividing Byte Size by Instructions. Note that this is not the same
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as Average Instruction Size. It computes a number relative to the total function
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size not just the size of the instruction list.
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=item B<# 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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=item B<# 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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=item B<# 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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=item B<# 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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=item B<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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=back
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=head1 SEE ALSO
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L<llvm-dis|llvm-dis>, L<http://llvm.cs.uiuc.edu/docs/BytecodeFormat.html>
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=head1 AUTHORS
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Maintained by Reid Spencer (L<http://llvm.x10sys.com/rspencer>).
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=cut
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