Fix portability issues in pg_amcheck's 004_verify_heapam.pl.

Test #12 overwrote a 1-byte varlena header to make it look like the
initial byte of a 4-byte varlena header, but the results were
endian-dependent. Also, the byte "abc" that followed the overwritten
byte would be interpreted differently depending on endian-ness.
Overwrite 4 bytes instead, in an endian-aware manner.

Test #13 accidentally managed to depend on TOAST_MAX_CHUNK_SIZE,
which varies slightly depending on MAXIMUM_ALIGNOF. That's not
the point anyway, so make the regexp insensitive to the expected
number of chunks.

Mark Dilger

Discussion: http://postgr.es/m/A80D68F6-E38F-482D-9522-E2FB6AAFE8A1@enterprisedb.com

diff --git a/src/bin/pg_amcheck/t/004_verify_heapam.pl b/src/bin/pg_amcheck/t/004_verify_heapam.pl
index 5ed119f04684c1b11614eaa8ccf71cad1ee2f6c2..4cb34a0e018f70ba3c12d994803bdf671883cf6e 100644 (file)
--- a/src/bin/pg_amcheck/t/004_verify_heapam.pl
+++ b/src/bin/pg_amcheck/t/004_verify_heapam.pl
@@ -53,10 +53,10 @@ use Test::More;
 # We choose to read and write binary copies of our table's tuples, using perl's
 # pack() and unpack() functions.  Perl uses a packing code system in which:
 #
+#  l = "signed 32-bit Long",
 #  L = "Unsigned 32-bit Long",
 #  S = "Unsigned 16-bit Short",
 #  C = "Unsigned 8-bit Octet",
-#  c = "signed 8-bit octet",
 #  q = "signed 64-bit quadword"
 #
 # Each tuple in our table has a layout as follows:
@@ -72,16 +72,16 @@ use Test::More;
 #    xx                     t_hoff: x          offset = 22     C
 #    xx                     t_bits: x          offset = 23     C
 #    xx xx xx xx xx xx xx xx   'a': xxxxxxxx   offset = 24     q
-#    xx xx xx xx xx xx xx xx   'b': xxxxxxxx   offset = 32     Cccccccc
-#    xx xx xx xx xx xx xx xx   'c': xxxxxxxx   offset = 40     SSSS
-#    xx xx xx xx xx xx xx xx      : xxxxxxxx    ...continued   SSSS
-#    xx xx                        : xx          ...continued   S
+#    xx xx xx xx xx xx xx xx   'b': xxxxxxxx   offset = 32     CCCCCCCC
+#    xx xx xx xx xx xx xx xx   'c': xxxxxxxx   offset = 40     CCllLL
+#    xx xx xx xx xx xx xx xx      : xxxxxxxx    ...continued
+#    xx xx                        : xx          ...continued
 #
 # We could choose to read and write columns 'b' and 'c' in other ways, but
 # it is convenient enough to do it this way.  We define packing code
 # constants here, where they can be compared easily against the layout.
 
-use constant HEAPTUPLE_PACK_CODE => 'LLLSSSSSCCqCcccccccSSSSSSSSS';
+use constant HEAPTUPLE_PACK_CODE => 'LLLSSSSSCCqCCCCCCCCCCllLL';
 use constant HEAPTUPLE_PACK_LENGTH => 58;     # Total size
 
 # Read a tuple of our table from a heap page.
@@ -121,15 +121,12 @@ sub read_tuple
            b_body5 => shift,
            b_body6 => shift,
            b_body7 => shift,
-           c1 => shift,
-           c2 => shift,
-           c3 => shift,
-           c4 => shift,
-           c5 => shift,
-           c6 => shift,
-           c7 => shift,
-           c8 => shift,
-           c9 => shift);
+           c_va_header => shift,
+           c_va_vartag => shift,
+           c_va_rawsize => shift,
+           c_va_extsize => shift,
+           c_va_valueid => shift,
+           c_va_toastrelid => shift);
    # Stitch together the text for column 'b'
    $tup{b} = join('', map { chr($tup{"b_body$_"}) } (1..7));
    return \%tup;
@@ -168,15 +165,12 @@ sub write_tuple
                    $tup->{b_body5},
                    $tup->{b_body6},
                    $tup->{b_body7},
-                   $tup->{c1},
-                   $tup->{c2},
-                   $tup->{c3},
-                   $tup->{c4},
-                   $tup->{c5},
-                   $tup->{c6},
-                   $tup->{c7},
-                   $tup->{c8},
-                   $tup->{c9});
+                   $tup->{c_va_header},
+                   $tup->{c_va_vartag},
+                   $tup->{c_va_rawsize},
+                   $tup->{c_va_extsize},
+                   $tup->{c_va_valueid},
+                   $tup->{c_va_toastrelid});
    seek($fh, $offset, 0)
        or BAIL_OUT("seek failed: $!");
    defined(syswrite($fh, $buffer, HEAPTUPLE_PACK_LENGTH))
@@ -273,6 +267,7 @@ open($file, '+<', $relpath)
    or BAIL_OUT("open failed: $!");
 binmode $file;
 
+my $ENDIANNESS;
 for (my $tupidx = 0; $tupidx < ROWCOUNT; $tupidx++)
 {
    my $offnum = $tupidx + 1;  # offnum is 1-based, not zero-based
@@ -289,6 +284,9 @@ for (my $tupidx = 0; $tupidx < ROWCOUNT; $tupidx++)
        plan skip_all => qq(Page layout differs from our expectations: expected (12345678, "abcdefg"), got ($a, "$b"));
        exit;
    }
+
+   # Determine endianness of current platform from the 1-byte varlena header
+   $ENDIANNESS = $tup->{b_header} == 0x11 ? "little" : "big";
 }
 close($file)
    or BAIL_OUT("close failed: $!");
@@ -459,22 +457,36 @@ for (my $tupidx = 0; $tupidx < ROWCOUNT; $tupidx++)
    }
    elsif ($offnum == 12)
    {
-       # Corrupt the bits in column 'b' 1-byte varlena header
-       $tup->{b_header} = 0x80;
+       # Overwrite column 'b' 1-byte varlena header and initial characters to
+       # look like a long 4-byte varlena
+       #
+       # On little endian machines, bytes ending in two zero bits (xxxxxx00 bytes)
+       # are 4-byte length word, aligned, uncompressed data (up to 1G).  We set the
+       # high six bits to 111111 and the lower two bits to 00, then the next three
+       # bytes with 0xFF using 0xFCFFFFFF.
+       #
+       # On big endian machines, bytes starting in two zero bits (00xxxxxx bytes)
+       # are 4-byte length word, aligned, uncompressed data (up to 1G).  We set the
+       # low six bits to 111111 and the high two bits to 00, then the next three
+       # bytes with 0xFF using 0x3FFFFFFF.
+       #
+       $tup->{b_header} = $ENDIANNESS eq 'little' ? 0xFC : 0x3F;
+       $tup->{b_body1} = 0xFF;
+       $tup->{b_body2} = 0xFF;
+       $tup->{b_body3} = 0xFF;
 
        $header = header(0, $offnum, 1);
        push @expected,
-           qr/${header}attribute 1 with length 4294967295 ends at offset 416848000 beyond total tuple length 58/;
+           qr/${header}attribute \d+ with length \d+ ends at offset \d+ beyond total tuple length \d+/;
    }
    elsif ($offnum == 13)
    {
        # Corrupt the bits in column 'c' toast pointer
-       $tup->{c6} = 41;
-       $tup->{c7} = 41;
+       $tup->{c_va_valueid} = 0xFFFFFFFF;
 
        $header = header(0, $offnum, 2);
        push @expected,
-           qr/${header}final toast chunk number 0 differs from expected value 6/,
+           qr/${header}final toast chunk number 0 differs from expected value \d+/,
            qr/${header}toasted value for attribute 2 missing from toast table/;
    }
    elsif ($offnum == 14)