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Perl: The Complete Reference
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Option
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-mModulename
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Description
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Generates source code for an XSUB, creating a hook function named boot_Modulename, suitable for identification by the DynaLoader module Debug; outputs debugging information to STDERR If STDERR is not specified, the debugging information is included as comments in the C source code produced Debug; prints with opcode as it s processed Debug; prints the shadow stack of the opcode as it s processed Debug; prints the contents of the shadow pad of lexical variables as loaded for each block (including the main program) Debug; prints the name of each fake PP function just before it is processed Debug; prints the source file name and line number of each line of Perl code as it is processed Debug; prints the timing information for each compilation stage
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-DO -Ds -Dp
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-Do -D -Dt -ffreetmps-each-bblock -ffreetmps-each-loop
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-fomit-taint -On
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Table 22-3
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Options Specifically for CC Backend
Forces the optimization of freeing temporaries to the end of each block until the end of each statement Forces the optimization of freeing temporaries to the end of each enclosing loop, instead of the end of each statement You can set only one of the freetmps optimizations at any one time Disables the generation of the tainting mechanism Sets the optimization to level n A level of -O1 implies -ffreetmps-each-bblock, and -O2 implies -ffreetmps-each-loop
AM FL Y
22:
Perl Compiler
This will produce a file, fooplc, that is actually ready-to-run Perl script It includes the bytecode and the ByteLoader module, which reads and executes the bytecode for you The produced file is platform independent it s still essentially a Perl source file, just in its compiled, rather than raw, state To execute it, just run the script as normal:
$ perl fooplc
Alternatively, you can produce a bytecode file, without the ByteLoader preamble, by using the backend directly:
$ perl -MO=Bytecode,-ofoobc foopl
Note that, by default, the bytecode file is sent to STDOUT, which will most likely upset your terminal You should always use the -ofilename option to specify an alternative file in order to store the compiled program Other options are listed in Table 22-4
Terse Backend
The Terse backend is useful when you want to examine the exact execution path of a script in its opcode-compiled format The information output is, as the name suggests, very terse, but it should provide you with a basic idea of the process that is taking place when a script executes By default, the information is formatted and printed in syntax order; for example:
$ perl -MO=Terse -e '$a = $b + 2; -e syntax OK LISTOP (0x13c530) pp_leave OP (0x1349a0) pp_enter COP (0x13c5f0) pp_nextstate BINOP (0x1435a0) pp_sassign BINOP (0x12eb40) pp_add [1] UNOP (0x12eb00) pp_null [15] GVOP (0x12eae0) pp_gvsv GV (0xc9864) *b SVOP (0x1435c0) pp_const IV (0xbc9d8) 2 UNOP (0xbf6c0) pp_null [15] GVOP (0xbf660) pp_gvsv GV (0xc6ba0) *a
FINE-TUNING APPLICATIONS
Perl: The Complete Reference
Option
-Do -Dt -Da -DC -S -m -fcompress-nullops
Description
Debug; prints out each opcode as it is processed Debug; prints out the compilation progress Debug; includes source assembler lines in the bytecode as comments Debug; prints each code value as taken from the final symbol tree Produces bytecode assembler source instead of the final bytecode binary Compiles the script as a module Completes only the required fields of opcodes that have been optimized by the compiler Other fields are ignored (saves space) Can be switched off with -fno-compress-nullops Ignores the code normally produced that populates the op_seq field of each opcode (saves space) This is normally used only by Perl s internal compiler Can be switched off with -fno-omit-sequence-numbers Ignores null opcodes; the code skips to the next non-null opcode in the execution tree (saves space and time) Can be switched off with -fno-bypassnullops Does not produce the internal pointers that compose the syntax tree This does not affect execution, but the produced bytecode cannot be disassembled This has the effect of rendering goto LABEL statements useless It also works as a suitable security measure to stop bytecode-compiled scripts from being reverse engineered Can be switched off with -fno-stripsyntax-tree Sets optimization to level n Currently, -O1 implies -fcompress-nullops and -fomit-sequence-numbers -O6 implies -fstrip-syntax-tree
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