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authorBjörn Gustavsson <bjorn@erlang.org>2012-03-09 15:53:29 +0100
committerPatrik Nyblom <pan@erlang.org>2012-03-22 18:16:14 +0100
commitc7f21d552b8034baecf8e7d078da5c9243826d2b (patch)
treedc9c2c27e2994c8eb57381d2eb045a21cfb383f6 /erts
parent326e098659de187099451bf20a33c3e6181b4141 (diff)
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beam_makeops: Add a simple preprocessor
Diffstat (limited to 'erts')
-rwxr-xr-xerts/emulator/utils/beam_makeops54
1 files changed, 52 insertions, 2 deletions
diff --git a/erts/emulator/utils/beam_makeops b/erts/emulator/utils/beam_makeops
index 58c36c3bdc..ea57000c82 100755
--- a/erts/emulator/utils/beam_makeops
+++ b/erts/emulator/utils/beam_makeops
@@ -28,6 +28,7 @@ my $verbose = 0;
my $hot = 1;
my $num_file_opcodes = 0;
my $wordsize = 32;
+my %defs; # Defines (from command line).
# This is shift counts and mask for the packer.
my $WHOLE_WORD = '';
@@ -96,6 +97,12 @@ my %unnumbered;
my %is_transformed;
#
+# Pre-processor.
+#
+my @if_val;
+my @if_line;
+
+#
# Code transformations.
#
my $te_max_vars = 0; # Max number of variables ever needed.
@@ -223,6 +230,7 @@ while (@ARGV && $ARGV[0] =~ /^-(.*)/) {
($outdir = shift), next if /^outdir/;
($wordsize = shift), next if /^wordsize/;
($verbose = 1), next if /^v/;
+ ($defs{$1} = $2), next if /^D(\w+)=(\w+)/;
die "$0: Bad option: -$_\n";
}
@@ -239,7 +247,43 @@ while (<>) {
}
next if /^\s*$/;
next if /^\#/;
-
+
+ #
+ # Handle %if.
+ #
+ if (/^\%if (\w+)/) {
+ my $name = $1;
+ my $val = $defs{$name};
+ defined $val or error("'$name' is undefined");
+ push @if_val, $val;
+ push @if_line, $.;
+ next;
+ } elsif (/^\%unless (\w+)/) {
+ my $name = $1;
+ my $val = $defs{$name};
+ defined $val or error("'$name' is undefined");
+ push @if_val, !$val;
+ push @if_line, $.;
+ next;
+ } elsif (/^\%else$/) {
+ unless (@if_line) {
+ error("%else without a preceding %if/%unless");
+ }
+ $if_line[$#if_line] = $.;
+ $if_val[$#if_val] = !$if_val[$#if_val];
+ next;
+ } elsif (/^\%endif$/) {
+ unless (@if_line) {
+ error("%endif without a preceding %if/%unless/%else");
+ }
+ pop @if_val;
+ pop @if_line;
+ next;
+ }
+ if (@if_val and not $if_val[$#if_val]) {
+ next;
+ }
+
#
# Handle assignments.
#
@@ -349,7 +393,13 @@ while (<>) {
$unnumbered{$name,$arity} = 1;
}
} continue {
- close(ARGV) if eof(ARGV);
+ if (eof(ARGV)) {
+ close(ARGV);
+ if (@if_line) {
+ error("Unterminated %if/%unless/%else at " .
+ "line $if_line[$#if_line]\n");
+ }
+ }
}
$num_file_opcodes = @gen_opname;