Support for MetroWerkz extensions to DWARF

[DaZombieKiller]

The MetroWerkz compiler contains a number of extension attributes which provide a little more information about the original sources:

// tags
TAG_MW_overlay_branch = 0x4080,

// attributes
AT_MW_mangled            = 0x2000 | FORM_STRING,
AT_MW_restore_SP         = 0x2010 | FORM_BLOCK2,
AT_MW_global_ref         = 0x2020 | FORM_REF,
AT_MW_global_ref_by_name = 0x2030 | FORM_STRING,
AT_MW_restore_S0         = 0x2040 | FORM_BLOCK2,
AT_MW_restore_S1         = 0x2050 | FORM_BLOCK2,
AT_MW_restore_S2         = 0x2060 | FORM_BLOCK2,
AT_MW_restore_S3         = 0x2070 | FORM_BLOCK2,
AT_MW_restore_S4         = 0x2080 | FORM_BLOCK2,
AT_MW_restore_S5         = 0x2090 | FORM_BLOCK2,
AT_MW_restore_S6         = 0x20A0 | FORM_BLOCK2,
AT_MW_restore_S7         = 0x20B0 | FORM_BLOCK2,
AT_MW_restore_S8         = 0x20C0 | FORM_BLOCK2,
AT_MW_restore_F20        = 0x20D0 | FORM_BLOCK2,
AT_MW_restore_F21        = 0x20E0 | FORM_BLOCK2,
AT_MW_restore_F22        = 0x20F0 | FORM_BLOCK2,
AT_MW_restore_F23        = 0x2100 | FORM_BLOCK2,
AT_MW_restore_F24        = 0x2110 | FORM_BLOCK2,
AT_MW_restore_F25        = 0x2120 | FORM_BLOCK2,
AT_MW_restore_F26        = 0x2130 | FORM_BLOCK2,
AT_MW_restore_F27        = 0x2140 | FORM_BLOCK2,
AT_MW_restore_F28        = 0x2150 | FORM_BLOCK2,
AT_MW_restore_F29        = 0x2160 | FORM_BLOCK2,
AT_MW_restore_F30        = 0x2170 | FORM_BLOCK2,
AT_MW_restore_D20        = 0x2180 | FORM_BLOCK2,
AT_MW_restore_D21        = 0x2190 | FORM_BLOCK2,
AT_MW_restore_D22        = 0x21A0 | FORM_BLOCK2,
AT_MW_restore_D23        = 0x21B0 | FORM_BLOCK2,
AT_MW_restore_D24        = 0x21C0 | FORM_BLOCK2,
AT_MW_restore_D25        = 0x21D0 | FORM_BLOCK2,
AT_MW_restore_D26        = 0x2240 | FORM_BLOCK2,
AT_MW_restore_D27        = 0x2250 | FORM_BLOCK2,
AT_MW_restore_D28        = 0x2260 | FORM_BLOCK2,
AT_MW_restore_D29        = 0x2270 | FORM_BLOCK2,
AT_MW_restore_D30        = 0x2280 | FORM_BLOCK2,
AT_MW_overlay_id         = 0x2290 | FORM_DATA4,
AT_MW_overlay_name       = 0x22A0 | FORM_STRING,
AT_MW_global_refs_block  = 0x2300 | FORM_BLOCK2,
AT_MW_local_spoffset     = 0x2310 | FORM_BLOCK4,
AT_MW_MIPS16             = 0x2330 | FORM_STRING,
AT_MW_DWARF2_location    = 0x2340 | FORM_BLOCK2,

// fundamental types
FT_MW_long_long          = 0x18,
FT_MW_signed_long_long   = 0x19,
FT_MW_unsigned_long_long = 0x1A,
FT_MW_fixed_vector_8x8   = 0xA408,
FT_MW_int128             = 0xA510,
FT_MW_signed_int_16x8    = 0xA610,
FT_MW_signed_int_8x16    = 0xA710,
FT_MW_signed_int_4x32    = 0xA810,
FT_MW_unsigned_int_16x8  = 0xA910,
FT_MW_unsigned_int_8x16  = 0xAA10,
FT_MW_unsigned_int_4x32  = 0xAB10,
FT_MW_vec2x32float       = 0xAC00,

// locations
OP_MW_FPREG  = 0x80,
OP_MW_FPDREG = 0x81,
OP_MW_DREF8  = 0x82,

Not all of these would be particularly useful for C/C++ header generation, but AT_global_ref, AT_global_ref_by_name, AT_global_refs_block and the additional fundamental types would likely allow for slightly more informative output. Including overlay information in the output via AT_overlay_id and AT_overlay_name may also be useful.