mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-15 01:13:30 +00:00
778e75f696
library/array.m:
library/builtin.m:
library/construct.m:
Fix copy-and-paste errors.
library/arrayd2d.m:
Use the mode array2d_di instead of array_di in a spot.
Delete an extra space from an exception message.
library/bimap.m:
Fix formatting.
library/bit_buffer.m:
Fix inverted argument types.
library/dir.m:
Say that make_single_directory/4 returns an error rather
than saying that it fails.
library/io.m:
Fix errors in obsolete pragmas.
library/assoc_list.m:
library/bag.m:
library/cord.m:
library/deconstruct.m:
library/enum.m:
library/fat_sparse_bitset.m:
library/getopt*.m:
library/int*.m:
library/io*.m:
library/type_desc.m:
Fix documentation errors.
tests/hard_coded/array2d_from_array.exp:
Conform to the changed exception message in array2d.m.
359 lines
12 KiB
Mathematica
359 lines
12 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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% Copyright (C) 2007, 2009 The University of Melbourne
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% Copyright (C) 2014, 2018, 2024-2026 The Mercury team.
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% This file is distributed under the terms specified in COPYING.LIB.
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%---------------------------------------------------------------------------%
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%
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% File: bit_buffer.m.
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% Main author: stayl.
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% Stability: medium.
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%
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% A bit buffer provides an interface between bit-oriented I/O requests
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% and byte-oriented streams. The useful part of the interface is defined
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% in bit_buffer.read and bit_buffer.write.
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%
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% CAVEAT: the user is referred to the documentation in the header
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% of array.m regarding programming with unique objects (the compiler
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% does not currently recognise them, hence we are forced to use
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% non-unique modes until the situation is rectified; this places
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% a small burden on the programmer to ensure the correctness of their
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% code that would otherwise be assured by the compiler.)
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%
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- module bit_buffer.
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:- interface.
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:- import_module bitmap.
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:- import_module stream.
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:- include_module bit_buffer.read.
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:- include_module bit_buffer.write.
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% An error_stream throws an `error_stream_error' exception if any of
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% its output methods are called, or returns an `error_stream_error'
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% if any of its input methods are called.
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%
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:- type error_stream ---> error_stream.
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:- type error_state ---> error_state.
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:- type error_stream_error ---> error_stream_error.
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:- instance stream.error(error_stream_error).
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:- instance stream.stream(error_stream, error_state).
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:- instance stream.input(error_stream, error_state).
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:- instance stream.bulk_reader(error_stream, byte_index, bitmap,
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error_state, error_stream_error).
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:- instance stream.output(error_stream, error_state).
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:- instance stream.writer(error_stream, bitmap.slice, error_state).
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module bool.
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:- import_module exception.
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:- import_module int.
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:- import_module list.
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:- import_module require.
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:- instance stream.error(error_stream_error) where
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[
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error_message(_) = "method called for error_stream"
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].
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:- instance stream.stream(error_stream, error_state) where
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[
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name(_Stream, "error_stream", State, State)
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].
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:- instance stream.input(error_stream, error_state) where
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[].
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:- instance stream.bulk_reader(error_stream, byte_index, bitmap,
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error_state, error_stream_error) where
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[
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bulk_get(_, _, _, BM, BM, 0, error(error_stream_error), State, State)
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].
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:- instance stream.output(error_stream, error_state) where
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[
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flush(_, State, State) :- throw(error_stream_error)
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].
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:- instance stream.writer(error_stream, bitmap.slice, error_state)
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where
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[
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put(_, _, _, _) :- throw(error_stream_error)
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].
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% The bitmap has room for the chunk size given as an argument
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% to `new', plus a word.
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%
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% This means that for a write buffer a word can always
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% be written to the buffer, and the buffer will be flushed
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% if the position is greater than the chunk size.
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%
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% For a read_buffer, bits will be read from the input stream
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% and placed starting at bit number `bits_per_int'. When the
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% buffer is nearly exhausted (less than a word left), the last
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% word is copied to the start of the buffer and the buffer is
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% refilled.
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%
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:- type bit_buffer(Stream, State, Error)
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---> bit_buffer(
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mer_bitmap :: bitmap,
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mer_pos :: bit_index,
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mer_size :: num_bits,
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mer_use_stream :: bool,
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mer_stream :: Stream,
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mer_state :: State,
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% For write buffers only.
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% If we are not writing to a stream, keep a list of filled
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% bitmaps in reverse order. These will be concatenated into
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% a single bitmap by finalize_to_bitmap.
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%
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mer_filled_bitmaps :: list(bitmap),
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% For read buffers only. The first error found when reading
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% from a stream. Subsequent calls will return this error.
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mer_read_status :: stream.res(Error)
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).
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:- type bit_buffer(Stream, State) == bit_buffer(Stream, State, {}).
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% XXX These should be unique.
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:- mode bit_buffer_ui == in.
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:- mode bit_buffer_di == in.
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:- mode bit_buffer_uo == out.
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% Allocating memory for every read or write would be bad,
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% so we manually perform destructive update in C.
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%
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:- pragma foreign_decl("C", "
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typedef struct {
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MR_BitmapPtr ML_bit_buffer_bitmap;
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MR_Integer ML_bit_buffer_pos;
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MR_Integer ML_bit_buffer_size;
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MR_Word ML_bit_buffer_use_stream;
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MR_Word ML_bit_buffer_stream;
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MR_Word ML_bit_buffer_state;
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MR_Word ML_bit_buffer_filled_bitmaps;
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MR_Word ML_bit_buffer_read_status;
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} ML_BitBuffer;
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typedef ML_BitBuffer *ML_BitBufferPtr;
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").
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:- pragma foreign_type("C", bit_buffer(Stream, State, Error),
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"ML_BitBufferPtr", [can_pass_as_mercury_type]).
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:- func new_buffer(bitmap, bit_index, num_bits, bool, Stream, State) =
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bit_buffer(Stream, State, Error).
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new_buffer(BM, Pos, Size, UseStream, Stream, State) =
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( if Size =< 0 then
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func_error($pred, "invalid buffer size")
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else
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new_buffer_2(BM, Pos, Size, UseStream, Stream, State, ok)
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).
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:- func new_buffer_2(bitmap, bit_index, num_bits, bool,
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Stream, State, stream.res(Error)) = bit_buffer(Stream, State, Error).
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new_buffer_2(BM, Pos, Size, UseStream, Stream, State, ReadStatus) =
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bit_buffer(BM, Pos, Size, UseStream, Stream, State, [], ReadStatus).
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:- pragma foreign_proc("C",
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new_buffer_2(BM::in, Pos::in, Size::in, UseStream::in,
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Stream::in, State::in, ReadStatus::in) = (Buffer::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"{
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MR_incr_hp_type_msg(Buffer, ML_BitBuffer, MR_ALLOC_ID,
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""bit_buffer.bit_buffer/3"");
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Buffer->ML_bit_buffer_bitmap = BM;
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Buffer->ML_bit_buffer_pos = Pos;
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Buffer->ML_bit_buffer_size = Size;
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Buffer->ML_bit_buffer_use_stream = UseStream;
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Buffer->ML_bit_buffer_stream = Stream;
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Buffer->ML_bit_buffer_state = State;
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Buffer->ML_bit_buffer_filled_bitmaps = MR_list_empty_msg(MR_ALLOC_ID);
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Buffer->ML_bit_buffer_read_status = ReadStatus;
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}").
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:- func (bit_buffer(_, _, _)::bit_buffer_ui) ^ bitmap =
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(bitmap::bitmap_uo) is det.
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:- func (bit_buffer(_, _, _)::bit_buffer_ui) ^ pos = (int::out) is det.
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:- func (bit_buffer(_, _, _)::bit_buffer_ui) ^ size = (int::out) is det.
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:- func (bit_buffer(_, _, _)::bit_buffer_ui) ^ use_stream = (bool::out) is det.
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:- func (bit_buffer(Stream, _, _)::bit_buffer_ui) ^ stream =
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(Stream::out) is det.
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:- func (bit_buffer(_, State, _)::bit_buffer_ui) ^ state = (State::uo) is det.
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:- func (bit_buffer(_, _, _)::bit_buffer_ui) ^ filled_bitmaps =
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(list(bitmap)::out) is det.
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:- func (bit_buffer(_, _, Error)::bit_buffer_ui) ^ read_status =
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(stream.res(Error)::out) is det.
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:- pragma foreign_proc("C",
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bitmap(Buffer::bit_buffer_ui) = (BM::bitmap_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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BM = Buffer->ML_bit_buffer_bitmap;
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").
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Buffer ^ bitmap = Buffer ^ mer_bitmap.
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:- pragma foreign_proc("C",
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pos(Buffer::bit_buffer_ui) = (Pos::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Pos = Buffer->ML_bit_buffer_pos;
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").
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Buffer ^ pos = Buffer ^ mer_pos.
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:- pragma foreign_proc("C",
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size(Buffer::bit_buffer_ui) = (Size::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Size = Buffer->ML_bit_buffer_size;
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").
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Buffer ^ size = Buffer ^ mer_size.
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:- pragma foreign_proc("C",
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use_stream(Buffer::bit_buffer_ui) = (UseStream::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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UseStream = Buffer->ML_bit_buffer_use_stream;
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").
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Buffer ^ use_stream = Buffer ^ mer_use_stream.
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:- pragma foreign_proc("C",
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stream(Buffer::bit_buffer_ui) = (Stream::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Stream = Buffer->ML_bit_buffer_stream;
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").
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Buffer ^ stream = Buffer ^ mer_stream.
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:- pragma foreign_proc("C",
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state(Buffer::bit_buffer_ui) = (State::uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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State = Buffer->ML_bit_buffer_state;
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").
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Buffer ^ state = unsafe_promise_unique(Buffer ^ mer_state).
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:- pragma foreign_proc("C",
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filled_bitmaps(Buffer::bit_buffer_ui) = (FilledBMs::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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FilledBMs = Buffer->ML_bit_buffer_filled_bitmaps;
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").
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Buffer ^ filled_bitmaps = Buffer ^ mer_filled_bitmaps.
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:- pragma foreign_proc("C",
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read_status(Buffer::bit_buffer_ui) = (ReadStatus::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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ReadStatus = Buffer->ML_bit_buffer_read_status;
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").
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Buffer ^ read_status = Buffer ^ mer_read_status.
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:- pred set_all(bitmap::bitmap_di, bit_index::in, num_bits::in, State::di,
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list(bitmap)::in, bit_buffer(Stream, State, Error)::bit_buffer_di,
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bit_buffer(Stream, State, Error)::bit_buffer_uo) is det.
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set_all(BM, Pos, Size, State, FilledBMs, !Buffer) :-
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!Buffer ^ mer_bitmap := BM,
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!Buffer ^ mer_pos := Pos,
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!Buffer ^ mer_state := State,
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!Buffer ^ mer_filled_bitmaps := FilledBMs,
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!Buffer ^ mer_size := Size.
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:- pragma foreign_proc("C",
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set_all(BM::bitmap_di, Pos::in, Size::in, State::di, FilledBMs::in,
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Buffer0::bit_buffer_di, Buffer::bit_buffer_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Buffer = Buffer0;
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Buffer->ML_bit_buffer_bitmap = BM;
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Buffer->ML_bit_buffer_pos = Pos;
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Buffer->ML_bit_buffer_size = Size;
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Buffer->ML_bit_buffer_state = State;
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Buffer->ML_bit_buffer_filled_bitmaps = FilledBMs;
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").
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:- pred set_bitmap(bitmap::bitmap_di, bit_index::in,
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bit_buffer(Stream, State, Error)::bit_buffer_di,
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bit_buffer(Stream, State, Error)::bit_buffer_uo) is det.
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set_bitmap(BM, Pos, !Buffer) :-
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!Buffer ^ mer_bitmap := BM,
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!Buffer ^ mer_pos := Pos.
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:- pragma foreign_proc("C",
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set_bitmap(BM::bitmap_di, Pos::in,
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Buffer0::bit_buffer_di, Buffer::bit_buffer_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Buffer = Buffer0;
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Buffer->ML_bit_buffer_bitmap = BM;
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Buffer->ML_bit_buffer_pos = Pos;
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").
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:- pred set_state(State::di,
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bit_buffer(Stream, State, Error)::bit_buffer_di,
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bit_buffer(Stream, State, Error)::bit_buffer_uo) is det.
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set_state(State, !Buffer) :-
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!:Buffer = !.Buffer ^ mer_state := State.
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:- pragma foreign_proc("C",
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set_state(State::di, Buffer0::bit_buffer_di, Buffer::bit_buffer_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Buffer = Buffer0;
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Buffer->ML_bit_buffer_state = State;
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").
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:- pred set_use_stream(bool::in,
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bit_buffer(Stream, State, Error)::bit_buffer_di,
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bit_buffer(Stream, State, Error)::bit_buffer_uo) is det.
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set_use_stream(UseStream, !Buffer) :-
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!:Buffer = !.Buffer ^ mer_use_stream := UseStream.
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:- pragma foreign_proc("C",
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set_use_stream(UseStream::in,
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Buffer0::bit_buffer_di, Buffer::bit_buffer_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Buffer = Buffer0;
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Buffer->ML_bit_buffer_use_stream = UseStream;
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").
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:- pred set_read_status(stream.res(Error)::in,
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bit_buffer(Stream, State, Error)::bit_buffer_di,
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bit_buffer(Stream, State, Error)::bit_buffer_uo) is det.
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set_read_status(ReadStatus, !Buffer) :-
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!:Buffer = !.Buffer ^ mer_read_status := ReadStatus.
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:- pragma foreign_proc("C",
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set_read_status(ReadStatus::in,
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Buffer0::bit_buffer_di, Buffer::bit_buffer_uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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Buffer = Buffer0;
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Buffer->ML_bit_buffer_read_status = ReadStatus;
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").
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%---------------------------------------------------------------------------%
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:- end_module bit_buffer.
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%---------------------------------------------------------------------------%
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