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ExtUtils::ParseXS::Utilities(3perl) Perl Programmers Reference Guide ExtUtils::ParseXS::Utilities(3perl)

NAME

ExtUtils::ParseXS::Utilities - Subroutines used with ExtUtils::ParseXS

SYNOPSIS

  use ExtUtils::ParseXS::Utilities qw(
    standard_typemap_locations
    trim_whitespace
    C_string
    valid_proto_string
    process_typemaps
    map_type
    standard_XS_defs
    assign_func_args
    analyze_preprocessor_statements
    set_cond
    Warn
    blurt
    death
    check_conditional_preprocessor_statements
    escape_file_for_line_directive
    report_typemap_failure
  );

SUBROUTINES

The following functions are not considered to be part of the public interface. They are documented here for the benefit of future maintainers of this module.

"standard_typemap_locations()"

  • Purpose

    Provide a list of filepaths where typemap files may be found. The filepaths -- relative paths to files (not just directory paths) -- appear in this list in lowest-to-highest priority.

    The highest priority is to look in the current directory.

      'typemap'
        

    The second and third highest priorities are to look in the parent of the current directory and a directory called lib/ExtUtils underneath the parent directory.

      '../typemap',
      '../lib/ExtUtils/typemap',
        

    The fourth through ninth highest priorities are to look in the corresponding grandparent, great-grandparent and great-great-grandparent directories.

      '../../typemap',
      '../../lib/ExtUtils/typemap',
      '../../../typemap',
      '../../../lib/ExtUtils/typemap',
      '../../../../typemap',
      '../../../../lib/ExtUtils/typemap',
        

    The tenth and subsequent priorities are to look in directories named ExtUtils which are subdirectories of directories found in @INC -- provided a file named typemap actually exists in such a directory. Example:

      '/usr/local/lib/perl5/5.10.1/ExtUtils/typemap',
        

    However, these filepaths appear in the list returned by "standard_typemap_locations()" in reverse order, i.e., lowest-to-highest.

      '/usr/local/lib/perl5/5.10.1/ExtUtils/typemap',
      '../../../../lib/ExtUtils/typemap',
      '../../../../typemap',
      '../../../lib/ExtUtils/typemap',
      '../../../typemap',
      '../../lib/ExtUtils/typemap',
      '../../typemap',
      '../lib/ExtUtils/typemap',
      '../typemap',
      'typemap'
        
  • Arguments

      my @stl = standard_typemap_locations( \@INC );
        

    Reference to @INC.

  • Return Value

    Array holding list of directories to be searched for typemap files.

"trim_whitespace()"

  • Purpose

    Perform an in-place trimming of leading and trailing whitespace from the first argument provided to the function.

  • Argument

      trim_whitespace($arg);
        
  • Return Value

    None. Remember: this is an in-place modification of the argument.

"C_string()"

  • Purpose

    Escape backslashes ("\") in prototype strings.

  • Arguments

          $ProtoThisXSUB = C_string($_);
        

    String needing escaping.

  • Return Value

    Properly escaped string.

"valid_proto_string()"

  • Purpose

    Validate prototype string.

  • Arguments

    String needing checking.

  • Return Value

    Upon success, returns the same string passed as argument.

    Upon failure, returns 0.

"process_typemaps()"

  • Purpose

    Process all typemap files.

  • Arguments

      my $typemaps_object = process_typemaps( $args{typemap}, $pwd );
        

    List of two elements: "typemap" element from %args; current working directory.

  • Return Value

    Upon success, returns an ExtUtils::Typemaps object.

"map_type()"

  • Purpose

    Performs a mapping at several places inside "PARAGRAPH" loop.

  • Arguments

      $type = map_type($self, $type, $varname);
        

    List of three arguments.

  • Return Value

    String holding augmented version of second argument.

"standard_XS_defs()"

  • Purpose

    Writes to the ".c" output file certain preprocessor directives and function headers needed in all such files.

  • Arguments

    None.

  • Return Value

    Returns true.

"assign_func_args()"

  • Purpose

    Perform assignment to the "func_args" attribute.

  • Arguments

      $string = assign_func_args($self, $argsref, $class);
        

    List of three elements. Second is an array reference; third is a string.

  • Return Value

    String.

"analyze_preprocessor_statements()"

  • Purpose

    Within each function inside each Xsub, print to the .c output file certain preprocessor statements.

  • Arguments

          ( $self, $XSS_work_idx, $BootCode_ref ) =
            analyze_preprocessor_statements(
              $self, $statement, $XSS_work_idx, $BootCode_ref
            );
        

    List of four elements.

  • Return Value

    Modifed values of three of the arguments passed to the function. In particular, the "XSStack" and "InitFileCode" attributes are modified.

"set_cond()"

  • Purpose
  • Arguments
  • Return Value

"current_line_number()"

  • Purpose

    Figures out the current line number in the XS file.

  • Arguments

    $self

  • Return Value

    The current line number.

"Warn()"

  • Purpose
  • Arguments
  • Return Value

"blurt()"

  • Purpose
  • Arguments
  • Return Value

"death()"

  • Purpose
  • Arguments
  • Return Value

"check_conditional_preprocessor_statements()"

  • Purpose
  • Arguments
  • Return Value

"escape_file_for_line_directive()"

  • Purpose

    Escapes a given code source name (typically a file name but can also be a command that was read from) so that double-quotes and backslashes are escaped.

  • Arguments

    A string.

  • Return Value

    A string with escapes for double-quotes and backslashes.

"report_typemap_failure"

  • Purpose

    Do error reporting for missing typemaps.

  • Arguments

    The "ExtUtils::ParseXS" object.

    An "ExtUtils::Typemaps" object.

    The string that represents the C type that was not found in the typemap.

    Optionally, the string "death" or "blurt" to choose whether the error is immediately fatal or not. Default: "blurt"

  • Return Value

    Returns nothing. Depending on the arguments, this may call "death" or "blurt", the former of which is fatal.

2019-10-27 perl v5.30.1