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The new Dbgi chunk returns data in the following format:
{debug_info_v1, Backend, Data}
This allows compilers to store the debug info in different
formats. In order to retrieve a particular format, for
instance, Erlang Abstract Format, one may invoke:
Backend:debug_info(erlang_v1, Module, Data, Opts)
Besides introducing the chunk above, this commit also:
* Changes beam_lib:chunk(Beam, [:abstract_code]) to
read from the new Dbgi chunk while keeping backwards
compatibility with old .beams
* Adds the {debug_info, {Backend, Data}} option to
compile:file/2 and friends that are stored in the
Dbgi chunk. This allows the debug info encryption
mechanism to work across compilers
* Improves dialyzer to work directly on Core Erlang,
allowing languages that do not have the Erlang
Abstract Format to be dialyzer as long as they emit
the new chunk and their backend implementation is
available
Backwards compatibility is kept across the board except
for those calling beam_lib:chunk(Beam, ["Abst"]), as the
old chunk is no longer available. Note however the "Abst"
chunk has always been optional.
Future OTP versions may remove parsing the "Abst" chunk
altogether from beam_lib once Erlang 19 and earlier is no
longer supported.
The current Dialyzer implementation still supports earlier
.beam files and such may also be removed in future versions.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson
and Hans Bolinder.
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Fix mistakes found by 'xmllint'.
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beam_lib:all_chunks/1 and beam_lib:build_module/1 can be useful
for special-purpose stripping, for example to remove the "Line"
chunk.
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Use Erlang specs and types for documentation
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Specify that beam_lib:cmp/2 can return {error, beam_lib, different_chunks} if a chunk is only present in one of the beams.
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The beam_lib:cmp/2 function only compares the executable parts
of the BEAM files, not attributes or abstract code. Since the
types and specs (used by Dialyzer) are contained in the abstract
code, beam_lib:cmp/2 will return 'ok' if the only difference
between two BEAM file are in the types or specs.
If an Erlang/OTP system is installed in a revision control
system, and beam_lib:cmp/2 is used to avoid committing unchanged
but newly compiled BEAM files, BEAM files with no other changes
than in types or specs may not get updated, which can problems
if Dialyzer or the debugger is run.
To avoid that problem, change beam_lib:cmp/2 to compare all
chunks *except* for the "CInf" chunk. The "CInf" chunk contains
the compilation time, compiler options, and compiler version.
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environment after a number of bugs are fixed and some features
are added in the documentation build process.
- The arity calculation is updated.
- The module prefix used in the function names for bif's are
removed in the generated links so the links will look like
http://www.erlang.org/doc/man/erlang.html#append_element-2
instead of
http://www.erlang.org/doc/man/erlang.html#erlang:append_element-2
- Enhanced the menu positioning in the html documentation when a
new page is loaded.
- A number of corrections in the generation of man pages (thanks
to Sergei Golovan)
- Moved some man pages to more apropriate sections, pages in
section 4 moved to 5 and pages in 6 moved to 7.
- The legal notice is taken from the xml book file so OTP's
build process can be used for non OTP applications.
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