File 2512-stdlib-Add-support-for-SSA-check-clauses-i... of Package erlang

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File 2512-stdlib-Add-support-for-SSA-check-clauses-in-the-pars.patch of Package erlang

From f70febab1e09ef11b27827d8be2a32d362f1d8ce Mon Sep 17 00:00:00 2001
From: Frej Drejhammar <frej.drejhammar@gmail.com>
Date: Wed, 16 Nov 2022 11:49:20 +0100
Subject: [PATCH 02/13] stdlib: Add support for SSA-check clauses in the parser

An SSA-check clause allows the user to specify patterns which should
apply to the BEAM SSA code at a certain point in the compiler
pipeline.
---
 lib/stdlib/src/erl_parse.yrl | 150 ++++++++++++++++++++++++++++++++++-
 1 file changed, 146 insertions(+), 4 deletions(-)

diff --git a/lib/stdlib/src/erl_parse.yrl b/lib/stdlib/src/erl_parse.yrl
index f97ea99e60..467a96f05e 100644
--- a/lib/stdlib/src/erl_parse.yrl
+++ b/lib/stdlib/src/erl_parse.yrl
@@ -49,7 +49,28 @@ type_sig type_sigs type_guard type_guards fun_type binary_type
 type_spec spec_fun typed_exprs typed_record_fields field_types field_type
 map_pair_types map_pair_type
 bin_base_type bin_unit_type
-maybe_expr maybe_match_exprs maybe_match.
+maybe_expr maybe_match_exprs maybe_match
+clause_body_exprs
+ssa_check_args
+ssa_check_binary_lit
+ssa_check_binary_lit_bytes_ls
+ssa_check_binary_lit_rest
+ssa_check_clause_args
+ssa_check_clause_args_ls
+ssa_check_expr
+ssa_check_exprs
+ssa_check_fun_ref
+ssa_check_list_lit
+ssa_check_list_lit_ls
+ssa_check_map_key
+ssa_check_map_key_element
+ssa_check_map_key_elements
+ssa_check_map_key_list
+ssa_check_map_key_tuple_elements
+ssa_check_pat
+ssa_check_pats
+ssa_check_when_clause
+ssa_check_when_clauses.
 
 Terminals
 char integer float atom string var
@@ -67,7 +88,8 @@ char integer float atom string var
 '!' '=' '::' '..' '...'
 '?='
 'spec' 'callback' % helper
-dot.
+dot
+'%ssa%'.
 
 Expect 0.
 
@@ -86,6 +108,7 @@ Left 500 mult_op.
 Unary 600 prefix_op.
 Nonassoc 700 '#'.
 Nonassoc 800 ':'.
+Nonassoc 900 clause_body_exprs.
 
 %% Types
 
@@ -225,8 +248,7 @@ clause_args -> pat_argument_list : element(1, '$1').
 clause_guard -> 'when' guard : '$2'.
 clause_guard -> '$empty' : [].
 
-clause_body -> '->' exprs: '$2'.
-
+clause_body -> '->' clause_body_exprs: '$2'.
 
 expr -> 'catch' expr : {'catch',?anno('$1'),'$2'}.
 expr -> expr '=' expr : {match,first_anno('$1'),'$1','$3'}.
@@ -500,6 +522,9 @@ pat_argument_list -> '(' pat_exprs ')' : {'$2',?anno('$1')}.
 exprs -> expr : ['$1'].
 exprs -> expr ',' exprs : ['$1' | '$3'].
 
+clause_body_exprs -> ssa_check_when_clauses exprs : '$1' ++ '$2'.
+clause_body_exprs -> exprs : '$1'.
+
 pat_exprs -> pat_expr : ['$1'].
 pat_exprs -> pat_expr ',' pat_exprs : ['$1' | '$3'].
 
@@ -549,6 +574,118 @@ comp_op -> '>' : '$1'.
 comp_op -> '=:=' : '$1'.
 comp_op -> '=/=' : '$1'.
 
+ssa_check_when_clauses -> ssa_check_when_clause : ['$1'].
+ssa_check_when_clauses -> ssa_check_when_clause ssa_check_when_clauses :
+    ['$1'|'$2'].
+
+ssa_check_when_clause -> '%ssa%' atom ssa_check_clause_args_ls 'when' atom '->'
+                             ssa_check_exprs '.' :
+   {ssa_check_when, ?anno('$1'), '$2', '$3', '$5', '$7'}.
+
+ssa_check_when_clause -> '%ssa%' ssa_check_clause_args_ls 'when' atom '->'
+                             ssa_check_exprs '.' :
+   {ssa_check_when, ?anno('$1'), {atom,?anno('$1'),pass}, '$2', '$4', '$6'}.
+
+ssa_check_exprs -> ssa_check_expr : ['$1'].
+ssa_check_exprs -> ssa_check_expr ',' ssa_check_exprs : ['$1'|'$3'].
+
+ssa_check_expr -> var '=' atom ssa_check_args :
+   {check_expr, ?anno('$1'), [set, '$1', '$3'|'$4']}.
+ssa_check_expr -> atom ssa_check_args :
+    {check_expr, ?anno('$1'), [none, '$1'|'$2']}.
+ssa_check_expr -> var '=' atom ':' atom ssa_check_args :
+   {check_expr, ?anno('$1'), [set, '$1', {'$3', '$5'}|'$6']}.
+ssa_check_expr -> atom integer :
+   {check_expr, ?anno('$1'), build_ssa_check_label('$1', '$2')}.
+ssa_check_expr -> atom var :
+   {check_expr, ?anno('$1'), build_ssa_check_label('$1', '$2')}.
+
+ssa_check_clause_args_ls -> '(' ')' : [].
+ssa_check_clause_args_ls -> '(' ssa_check_clause_args ')' : '$2'.
+ssa_check_clause_args_ls -> '(' '...' ')' : ['$2'].
+
+ssa_check_clause_args -> var : ['$1'].
+ssa_check_clause_args -> var ',' ssa_check_clause_args : ['$1'|'$3'].
+ssa_check_clause_args -> var ',' '...' : ['$1', '$3'].
+
+ssa_check_args -> '(' ')' : {[], ?anno('$1')}.
+ssa_check_args -> '(' ssa_check_pats ')' : '$2'.
+ssa_check_args -> '(' '...' ')' : ['$2'].
+
+ssa_check_pats -> ssa_check_pat : ['$1'].
+ssa_check_pats -> ssa_check_pat ',' ssa_check_pats : ['$1'|'$3'].
+ssa_check_pats -> ssa_check_pat ',' '...' : ['$1', '$3'].
+
+ssa_check_pat -> var : '$1'.
+ssa_check_pat -> atom : '$1'.
+ssa_check_pat -> integer : '$1'.
+ssa_check_pat -> float : '$1'.
+ssa_check_pat -> float '(' float ')': {float_epsilon, '$1', '$3'}.
+ssa_check_pat -> ssa_check_fun_ref : '$1'.
+ssa_check_pat -> '{' '}' : {tuple, ?anno('$1'), []}.
+ssa_check_pat -> '{' ssa_check_pats '}' : {tuple, ?anno('$1'), '$2'}.
+ssa_check_pat -> '{' '...' '}' : {tuple, ?anno('$1'), ['$2']}.
+ssa_check_pat -> ssa_check_binary_lit : '$1'.
+ssa_check_pat -> ssa_check_list_lit : '$1'.
+ssa_check_pat -> '#' '{' '}' : {map, ?anno('$1'), []}.
+ssa_check_pat -> '#' '{' ssa_check_map_key_elements '}' : {map, ?anno('$1'), '$3'}.
+
+ssa_check_fun_ref -> 'fun' atom '/' integer : {local_fun, '$2', '$4'}.
+ssa_check_fun_ref -> 'fun' atom ':' atom '/' integer : {external_fun, '$2', '$4', '$6'}.
+
+ssa_check_binary_lit -> '<<' '>>' : {binary, ?anno('$1'), []}.
+ssa_check_binary_lit -> '<<' ssa_check_binary_lit_bytes_ls '>>' :
+    {binary, ?anno('$1'), '$2'}.
+ssa_check_binary_lit -> '<<' ssa_check_binary_lit_rest '>>' :
+    {binary, ?anno('$1'), ['$2']}.
+
+ssa_check_binary_lit_bytes_ls -> integer : ['$1'].
+ssa_check_binary_lit_bytes_ls -> integer ',' ssa_check_binary_lit_bytes_ls :
+    ['$1'|'$3'].
+ssa_check_binary_lit_bytes_ls -> integer ',' ssa_check_binary_lit_rest :
+    ['$1', '$3'].
+
+ssa_check_binary_lit_rest -> integer ':' integer : {'$1', '$3'}.
+
+ssa_check_list_lit -> '[' ']' : {list, ?anno('$1'), []}.
+ssa_check_list_lit -> '[' ssa_check_list_lit_ls ']' :
+    {list, ?anno('$1'), '$2'}.
+
+ssa_check_list_lit_ls -> ssa_check_pat : ['$1'].
+ssa_check_list_lit_ls -> ssa_check_pat ',' ssa_check_list_lit_ls : ['$1'|'$3'].
+ssa_check_list_lit_ls -> ssa_check_pat ',' '...' : ['$1', '$3'].
+ssa_check_list_lit_ls -> ssa_check_pat '|' ssa_check_pat : ['$1'|'$3'].
+
+ssa_check_map_key -> atom : '$1'.
+ssa_check_map_key -> integer : '$1'.
+ssa_check_map_key -> float : '$1'.
+ssa_check_map_key -> '{' ssa_check_map_key_tuple_elements '}' :
+    {tuple, ?anno('$1'), '$2'}.
+ssa_check_map_key -> '{' '}' : {tuple, ?anno('$1'), []}.
+ssa_check_map_key -> ssa_check_binary_lit : '$1'.
+ssa_check_map_key -> '[' ssa_check_map_key_list ']' :
+    {list, ?anno('$1'), '$2'}.
+ssa_check_map_key -> '[' ']' : {list, ?anno('$1'), []}.
+ssa_check_map_key -> '#' '{' '}' : {map, ?anno('$1'), []}.
+ssa_check_map_key -> '#' '{' ssa_check_map_key_elements '}' : '$3'.
+
+ssa_check_map_key_list -> ssa_check_map_key : ['$1'].
+ssa_check_map_key_list -> ssa_check_map_key ',' ssa_check_map_key_list :
+    ['$1'|'$3'].
+ssa_check_map_key_list -> ssa_check_map_key '|' ssa_check_map_key :
+    ['$1'|'$3'].
+
+ssa_check_map_key_elements -> ssa_check_map_key_element : ['$1'].
+ssa_check_map_key_elements -> ssa_check_map_key_element ',' ssa_check_map_key_elements :
+    ['$1'|'$3'].
+
+ssa_check_map_key_element -> ssa_check_map_key '=>' ssa_check_map_key:
+    {'$1', '$3'}.
+
+ssa_check_map_key_tuple_elements -> ssa_check_map_key : ['$1'].
+ssa_check_map_key_tuple_elements -> ssa_check_map_key ',' ssa_check_map_key_tuple_elements:
+    ['$1'|'$3'].
+
 Header
 "%% This file was automatically generated from the file \"erl_parse.yrl\"."
 "%%"
@@ -1833,4 +1970,9 @@ modify_anno1([H|T], Ac, Mf) ->
 modify_anno1([], Ac, _Mf) -> {[],Ac};
 modify_anno1(E, Ac, _Mf) when not is_tuple(E), not is_list(E) -> {E,Ac}.
 
+build_ssa_check_label({atom,_,label}, Lbl) ->
+    [label, Lbl];
+build_ssa_check_label({atom,L,_}, _) ->
+    return_error(L, "expected 'label'").
+
 %% vim: ft=erlang
-- 
2.35.3

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