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beam_makeops: Add some sanity checks

We want to make sure that a tag/type name is not defined more than
once and that we don't define too many primitive tags. Primitive
tags must be named with lowercase letters (or they will be confused
with variable names in transformations in the ops.tab file).
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commit 8f066e99c9d614742dfb987befe72d21de4d739a 1 parent e8becad
Björn Gustavsson bjorng authored
Showing with 52 additions and 17 deletions.
  1. +52 −17 erts/emulator/utils/beam_makeops
69 erts/emulator/utils/beam_makeops
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@@ -67,6 +67,10 @@ my $max_gen_operands = 8;
# Must be even. The beam_load.c file must be updated, too.
my $max_spec_operands = 6;
+# The maximum number of primitive genop_types.
+
+my $max_genop_types = 16;
+
my %gen_opnum;
my %num_specific;
my %gen_to_spec;
@@ -142,34 +146,61 @@ my %arg_size = ('r' => 0, # x(0) - x register zero
my %type_bit;
my @tag_type;
+sub define_type_bit {
+ my($tag,$val) = @_;
+ defined $type_bit{$tag} and
+ sanity("the tag '$tag' has already been defined with the value ",
+ $type_bit{$tag});
+ $type_bit{$tag} = $val;
+}
+
{
my($bit) = 1;
my(%bit);
foreach (split('', $genop_types)) {
push(@tag_type, $_);
- $type_bit{$_} = $bit;
+ define_type_bit($_, $bit);
$bit{$_} = $bit;
$bit *= 2;
}
# Composed types.
- $type_bit{'d'} = $type_bit{'x'} | $type_bit{'y'} | $type_bit{'r'};
- $type_bit{'c'} = $type_bit{'i'} | $type_bit{'a'} | $type_bit{'n'} | $type_bit{'q'};
- $type_bit{'s'} = $type_bit{'d'} | $type_bit{'i'} | $type_bit{'a'} | $type_bit{'n'};
- $type_bit{'j'} = $type_bit{'f'} | $type_bit{'p'};
+ define_type_bit('d', $type_bit{'x'} | $type_bit{'y'} | $type_bit{'r'});
+ define_type_bit('c', $type_bit{'i'} | $type_bit{'a'} |
+ $type_bit{'n'} | $type_bit{'q'});
+ define_type_bit('s', $type_bit{'d'} | $type_bit{'i'} |
+ $type_bit{'a'} | $type_bit{'n'});
+ define_type_bit('j', $type_bit{'f'} | $type_bit{'p'});
# Aliases (for matching purposes).
- $type_bit{'I'} = $type_bit{'u'};
- $type_bit{'t'} = $type_bit{'u'};
- $type_bit{'A'} = $type_bit{'u'};
- $type_bit{'L'} = $type_bit{'u'};
- $type_bit{'b'} = $type_bit{'u'};
- $type_bit{'N'} = $type_bit{'u'};
- $type_bit{'U'} = $type_bit{'u'};
- $type_bit{'e'} = $type_bit{'u'};
- $type_bit{'P'} = $type_bit{'u'};
- $type_bit{'Q'} = $type_bit{'u'};
+ define_type_bit('I', $type_bit{'u'});
+ define_type_bit('t', $type_bit{'u'});
+ define_type_bit('A', $type_bit{'u'});
+ define_type_bit('L', $type_bit{'u'});
+ define_type_bit('b', $type_bit{'u'});
+ define_type_bit('N', $type_bit{'u'});
+ define_type_bit('U', $type_bit{'u'});
+ define_type_bit('e', $type_bit{'u'});
+ define_type_bit('P', $type_bit{'u'});
+ define_type_bit('Q', $type_bit{'u'});
+}
+
+#
+# Sanity checks.
+#
+
+{
+ if (@tag_type > $max_genop_types) {
+ sanity("\$max_genop_types is $max_genop_types, ",
+ "but there are ", scalar(@tag_type),
+ " primitive tags defined\n");
+ }
+
+ foreach my $tag (@tag_type) {
+ sanity("tag '$tag': primitive tags must be named with lowercase letters")
+ unless $tag =~ /^[a-z]$/;
+ }
}
#
@@ -436,12 +467,12 @@ sub emulator_output {
#
my(@bits) = (0) x ($max_spec_operands/2);
- my($shift) = 16;
my($i);
for ($i = 0; $i < $max_spec_operands && defined $args[$i]; $i++) {
my $t = $args[$i];
if (defined $type_bit{$t}) {
- $bits[int($i/2)] |= $type_bit{$t} << (16*($i%2));
+ my $shift = $max_genop_types * ($i % 2);
+ $bits[int($i/2)] |= $type_bit{$t} << $shift;
}
}
@@ -753,6 +784,10 @@ sub error {
die $where, @message, "\n";
}
+sub sanity {
+ die "internal error: ", @_, "\n";
+}
+
sub comment {
my($lang, @comments) = @_;
my($prefix);
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