From a5fcd4f26969a768950dc643eeed2fdb41a5dc41 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jos=C3=A9=20Valim?= Date: Sat, 16 Jul 2016 22:24:50 +0200 Subject: Move expansion of strings in binaries to v3_core This speeds up the compilation of binary literals with string values in them. For example, compiling a file with a ~340kB binary would yield the following times by the compiler: Compiling "foo" parse_module : 0.130 s 5327.6 kB transform_module : 0.000 s 5327.6 kB lint_module : 0.011 s 5327.8 kB expand_module : 0.508 s 71881.2 kB v3_core : 0.463 s 11.5 kB Notice the increase in memory and processing time in expand_module and v3_core. This happened because expand_module would expand the string in binaries into chars. For example, the binary <<"foo">>, which is represented as {bin, 1, [ {bin_element, 1, {string, 1, "foo"}, default, default} ]} would be converted to {bin, 1, [ {bin_element, 1, {char, 1, $f}, default, default}, {bin_element, 1, {char, 1, $o}, default, default}, {bin_element, 1, {char, 1, $o}, default, default} ]} However, v3_core would then traverse all of those characters and convert it into an actual binary, as it is a literal value. This patch addresses this issue by moving the expansion of string into chars to v3_core and only if a literal value cannot not be built. This reduces the compilation time of the file mentioned above to the values below: Compiling "bar" parse_module : 0.134 s 5327.6 kB transform_module : 0.000 s 5327.6 kB lint_module : 0.005 s 5327.8 kB expand_module : 0.000 s 5328.7 kB v3_core : 0.013 s 11.2 kB --- lib/stdlib/src/eval_bits.erl | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'lib/stdlib/src/eval_bits.erl') diff --git a/lib/stdlib/src/eval_bits.erl b/lib/stdlib/src/eval_bits.erl index 80667023fb..631faa3be5 100644 --- a/lib/stdlib/src/eval_bits.erl +++ b/lib/stdlib/src/eval_bits.erl @@ -67,16 +67,20 @@ expr_grp([Field | FS], Bs0, Lf, Acc) -> expr_grp([], Bs0, _Lf, Acc) -> {value,Acc,Bs0}. +eval_field({bin_element, _, {string, _, S}, {integer,_,8}, [integer,{unit,1},unsigned,big]}, Bs0, _Fun) -> + Latin1 = [C band 16#FF || C <- S], + {list_to_binary(Latin1),Bs0}; eval_field({bin_element, _, {string, _, S}, default, default}, Bs0, _Fun) -> Latin1 = [C band 16#FF || C <- S], {list_to_binary(Latin1),Bs0}; -eval_field({bin_element, Line, {string, _, S}, Size0, Options0}, Bs, _Fun) -> - {_Size,[Type,_Unit,_Sign,Endian]} = +eval_field({bin_element, Line, {string, _, S}, Size0, Options0}, Bs0, Fun) -> + {Size1,[Type,{unit,Unit},Sign,Endian]} = make_bit_type(Line, Size0, Options0), - Res = << <<(eval_exp_field1(C, no_size, no_unit, - Type, Endian, no_sign))/binary>> || + {value,Size,Bs1} = Fun(Size1, Bs0), + Res = << <<(eval_exp_field1(C, Size, Unit, + Type, Endian, Sign))/binary>> || C <- S >>, - {Res,Bs}; + {Res,Bs1}; eval_field({bin_element,Line,E,Size0,Options0}, Bs0, Fun) -> {value,V,Bs1} = Fun(E, Bs0), {Size1,[Type,{unit,Unit},Sign,Endian]} = -- cgit v1.2.3