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Profiling shows that subst_vsub/3 dominates the running time. It
is therefore worthwhile optimizing it.
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If we have a sequence of put_map_* instructions operating on the
same map, it will be more efficient if we can have one is_map/2
instruction before put_map_* instructions, so that each put_map_*
does not need to test whether the argument is a map.
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Essentially, core_lib:literal_value/1 became useless when literals
were introduced in R12. Since we always create #c_literal{} records
whenever possible, literal_value/1 would *only* succeed when it was
passed a #c_literal{} argument.
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When translating a function with map construction:
f(A) ->
B = b,
C = c,
#{A=>1,B=>2,C=>3}.
v3_core would break apart the map construction into three
parts because of the way the map instructions in BEAM work --
variable keys need to be in their own instruction.
In the example, constant propagation will turn two of the
keys to literal keys. But the initial breaking apart will
not be undone, so there will still be three map constructions:
'f'/1 =
fun (_cor0) ->
let <_cor3> = ~{::<_cor0,1>}~
in let <_cor4> = ~{::<'b',2>|_cor3}~
in ~{::<'c',3>|_cor4}~
It would be possible to complicate the sys_core_fold pass
to regroup map operations so that we would get:
'f'/1 =
fun (_cor0) ->
let <_cor3> = ~{::<_cor0,1>}~
in ~{::<'b',2>,::<'c',3>|_cor3}~
A simpler way that allows to simplify the translation is
to skip the grouping in v3_core and translate the function
to:
'f'/1 =
fun (_cor0) ->
~{::<_cor0,1>,::<'b',2>,::<'c',3>}~
We will then let v3_kernel do the grouping while translating
from Core Erlang to Kernel Erlang.
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No need to check for variables in Map keys.
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Not only variables are allowed as arguments, the name should reflect that.
Change cerl Map argument interface
* cerl:map_arg/1 is more suitable then cerl:map_val/1 in this case.
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Reject all expressions that are known to fail.
Emit 'badarg' for those expressions.
Ex.
[]#{ a => 1}
Is not a valid map update expression.
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The Kernel instructions were not properly ordered when compiling maps with
complex values mixed in assoc and exact pairs.
Reported-by: Ulf Norell
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* Combine multiple get values with one instruction
* Combine multiple check keys with one instruction
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* egil/compiler/maps-fix-codegen:
compiler: Fix codegen multiple updates for Maps
erts,compiler: Correct and amend tests for Maps
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This fixes an error on multiple updates optimization for map pairs.
The error was introduced with moving to term order in Maps.
This also fixes an error where register life time was lost for values
and could result in erroneuos values being emitted in for map pairs.
Simplified v3_codegen by moving multiple update optimizations to v3_kernel.
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* hsv/using_lists_droplast:
lib/mnesia/test/ - Replace reverse(tl(reverse(L))) with lists:droplast/1
lib/ssh - Replace reverse(tl(reverse(L))) with lists:droplast/1
lib/wx - Replace reverse(tl(reverse(L))) with lists:droplast/1
Use lists:droplast/1 in orber/orber_interceptors.erl
Import and use lists:droplast/1 in v3_core/v3_kernel
OTP-11678
OTP-11677
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Simplify compiler internals and parsing of core format.
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Simplify compiler internals for kernel passes.
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The syntax is handled upto v3_kernel where it is reduced to
previous behaviour for construction and updates. Meaning,
the ':=' operator is handled exactly as '=>' operator.
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To make it possible to build the entire OTP system, also define
dummys for the instructions in ops.tab.
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Also imported lists:last/1, and removed the local definition.
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files as delimiters.
While working on a tool that processes Erlang code and testing it against this repo,
I found out about those little sneaky 0xff. I thought it may be of help to other
people build such tools to remove non-conforming-to-standard characters.
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ErrorInfo is documented to be:
{ErrorLine,Module,ErrorDescriptor}
but for some errors with line numbers it would look like:
{Module,ErrorDescriptor}
Ensure that all ErrorInfo tuples have three elements. Use 'none'
instead of a line number:
{none,Module,ErrorDescriptor}
There already are errors that return 'none' when no line number is
available, but that convention was not documented. Mention it in the
documentation.
Also make sure that the compiler will not print 'none' as a line
number in error messages (if the 'report_errors' option is given) as
that looks stupid. That is, when attempting to compile a non-existing
module, the error message should be:
non-existing.erl: no such file or directory
and not:
non-existing.erl:none: no such file or directory
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This reverts commit 750ecdea08fa5fa7e32b7f3019eed96c1699427e, reversing
changes made to 2cfa0466c3b3c7bd5e3621aff0f3e2ca30addb68.
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Local function references should be handled directly as a make_fun
internal BIF call instead of creating an extra lambda function every
time they are used.
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When matched variable is used as a size field in multiple clauses,
as in:
foo(<<L:8,A:L>>) -> A;
foo(<<L:8,A:L,B:8>>) -> {A,B}.
the match tree would branch out before the segment that used the
matched-out variable (in this example, the tree would branch out before
the matching of A:L). That happens because the pattern matching
compilator did not take variable substitutions into account when
grouping clauses that match the same value.
That is, the generated code would work similarly to this code:
foo(<<L:8,T/binary>>) ->
case T of
<<A:L>> ->
A;
_ ->
case T of
<<A:L,B:8>> -> %% A matched out again!
{A,B}
end
end.
We would like the matching to work more like:
foo(<<L,A:L,T/binary>>) ->
case T of
<<>> -> A;
<<B:8>> -> {A,B}
end.
Fix the problem by taking the substitutions into account when grouping
clauses that match out the same value.
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The bs_match_string instruction is used to speed up matching of
binary literals. For example, given this source code:
foo1(<<1,2,3>>) -> ok.
The matching part of the code will look like:
{test,bs_start_match2,{f,1},1,[{x,0},0],{x,0}}.
{test,bs_match_string,{f,3},[{x,0},24,{string,[1,2,3]}]}.
{test,bs_test_tail2,{f,3},[{x,0},0]}.
Nice. However, if we do a simple change to the source code:
foo2(<<1,2,3>>) -> ok;
foo2(<<>>) -> error.
the resulting matching code will look like (sligthly simplified):
{test,bs_start_match2,{f,4},1,[{x,0},0],{x,0}}.
{test,bs_get_integer2,{f,7},1,[{x,0},{integer,8},1,Flags],{x,1}}.
{test,is_eq_exact,{f,8},[{x,1},{integer,1}]}.
{test,bs_match_string,{f,6},[{x,0},16,{string,[2,3]}]}.
{test,bs_test_tail2,{f,6},[{x,0},0]}.
{move,{atom,ok},{x,0}}.
return.
{label,6}.
{bs_restore2,{x,0},{atom,start}}.
{label,7}.
{test,bs_test_tail2,{f,8},[{x,0},0]}.
That is, matching of the first byte is not combined into the
bs_match_string instruction that follows.
Fix this problem by allowing a bs_match_string instruction to be
used if all clauses will match either the same integer literal or
the empty binary.
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The compiler would silently accept and Dialyzer would crash on
code like:
<<X:(2.5)>>
It is never acceptable for Dialyzer to crash. The compiler should
at least generate a warning for such code. It is tempting to let
the compiler generate an error, but that would mean that code like:
Sz = 42.0,
<<X:Sz>>.
would be possible to compile with optimizations disabled, but not
with optimizations enabled.
Dialyzer crashes because it calls cerl:bitstr_bitsize/1, which
crashes if the type of size for the segment is invalid. The easiest
way to avoid that crash is to extend the sanity checks in v3_core
to also include the size field of binary segments. That will cause
the compiler to issue a warning and to replace the bad binary
construction with a call to erlang:error/1. (It also means that
Dialyzer will not issue a warning for bad size fields.)
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In Core Erlang and later passes, compiler-generated code can be
indicated in two different ways: by negative line numbers and by
a 'compiler_generated' annotation.
Simplify the code and improve coverage by turning negative line
numbers positive and adding a 'compiler_generated' annotation in
the v3_core pass. That means that Core Erlang and latter passes
do not have deal with negative line numbers.
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Handling of guards become a mess when andalso/orelse in guards
were introduced. Clean it up by using common code for most
constructs, regardless of where they occur, and when needed use
is_in_guard/1 to handle guard constructs differently.
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The size field of a #k_bin_int{} is always a literal integer
(#k_int{}); thus there is no way this clause can match.
While we are at it, remove a duplicated call to
select_assert_match_possible/3 in select_bin_int/1.
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arg_con/1 will never be called with #k_bin_int{} argument, since
a #k_bin_int{} is constructed out of #k_bin_seg{} only after
arg_con/1 has been called with a #k_bin_seg{} argument.
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If we let v3_kernel make sure that a 'put' operation always has a
destination register, the special case in v3_codegen is not needed.
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It is unlikely that sharing literals will actually save any time.
Literals that can be shared are usually small. It is more likely
that maintaining the dictionary of literals will waste time.
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A guard with a sequence will cause a crash in v3_codegen. Currently,
it seems that a sequence in a guard will never happen when compiling
from Erlang code, but there are several reasons to fix this problem
anyway:
* There are other compilers that generate Core Erlang code.
* Changes to sys_core_fold (perhaps additional optimizations) may
cause sequences to be generated in guards.
* A previously uncovered line in sys_core_fold:opt_guard_try/1 will
now be covered.
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arg_val/1 will never be called for single-valued types, so there
is no need handle these types.
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In the v3_life pass, it is assumed that a 'match_fail' primop
only occur at the top-level and at the end of a function.
But this code:
do_split_cases(A) ->
case A of
x ->
Z = dummy1;
_ ->
Z = dummy2,
a=b
end,
Z.
will be optimized by sys_core_fold to the following code:
'split_cases'/1 =
fun (_cor0) ->
let <_cor7,Z> =
case _cor0 of
<'x'> when 'true' ->
< 'dummy1','dummy1' >
<_cor6> when 'true' ->
%% Here follows a 'match_fail' primop inside
%% multiple return values:
< primop 'match_fail'({'badmatch','b'}),'dummy2' >
end
in
Z
moving the 'match_fail' primop into a "values" construction.
In the future, we would like to get rid of the v3_life pass (it is
there for historical reasons), so in the mean-time we prefer to not
add more code to it by generalizing the handling of 'match_fail'.
Since the 'match_fail' primop can be simulated by erlang:error/{1,2},
the simplest solution is to translate 'match_fail' to a call to
erlang:error/{1,2} in v3_kernel and remove the handling of
'match_fail' in v3_life and v3_codegen.
It is tempting to get rid of 'match_fail' also in the Core Erlang
format, but there are two issues:
- Removing the support for 'match_fail' completely may break tools
that generate Core Erlang code. We should not do that in a minor
release.
- There is no easy way to generate a 'function_clause' exception
that will remain correct if it will be inlined into another
function. (Calling "erlang:error(function_clause, Args)" is
fine only if it is not inlined into another function.) A good
solution probably involves introducing new instructions, which
is better done in a major release.
Noticed-by: Håkan Matsson
Minimized-test-case-by: Erik Søe Sørensen
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Now that beam_asm computes the Index and Uniq values for funs, there
is no need to compute those values in the sys_pre_expand and v3_kernel
modules, thus eliminating the calls to the deprecated erlang:hash/2
function.
It would be tempting to stop generating the name for the fun in
sys_pre_expand so that we did not have to add the Info field to a tuple.
But:
* The debugger depends on the name being there. (Simple solution:
Let the debugger generate the name itself.)
* When a fun has been inlined into another function, the fun name in
'id' annotation will be used to notice the inlining and change the
final clause of the top-level case from generating a 'function_clause'
exception to a case_clause exception. (Possible workaround: Have the
inliner set an inlined attribute on functions that have been inlined, or
have the inliner rewrite 'function_clause' exceptions itself.)
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'eval_bits' is a common utility module used for evaluting binary
construction and matching. The functions that do matching
(match_bits/{6,7} and bin_gen/6) are supposed to treat the bindings as
an abstract data type, but they assume that the bindings have the same
representation as in the erl_eval module. That may cause binary
matching to fail in the debugger, because the debugger represents the
bindings as an unordered list of two-tuples, while the erl_eval
modules uses an ordered list of two-tuple (an ordset).
One way to fix the problem would be to let the debugger to use ordered
lists to represent the bindings. Unfortunately, that would also change
how the bindings are presented in the user interface. Currently, the
variable have most been recently assigned is shown first, which is
convenient.
Fix the matching problem by mending the leaky abstraction in
eval_bits. The matching functions needs to be passed two additional
operations: one for looking up a variable in the bindings and one for
adding a binding. Those operations could be passed as two more funs
(in addition to the evaluation and match fun already passed), but the
functions already have too many arguments. Therefore, change the
meaning of the match fun, so that the first argument is the operation
to perform ('match', 'binding', or 'add_binding') and second argument
is a tuple with arguments for the operation.
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