JWasm - Wasm

• local labels in procedures.
• '::' operator to allow to define a global label inside a procedure.
• PROTO directive.
• INVOKE directive.
• TYPEDEF directive.
• UNION directive.
• RECORD directive.
• nested (+anonymous) STRUCTs and UNIONs.
• LOCAL directive improved, now fully MASM compatible.
• some of Masm's OPTIONs are accepted:
  • option PROC: private | public | export
  • option DOTNAME | NODOTNAME (nodotname is dummy)
  • option CASEMAP: none | notpublic | all (notpublic is dummy)
  • option PROLOGUE: none | prologuedef | <macro name>
  • option EPILOGUE: none | epiloguedef | <macro name>
  • option NOKEYWORD: <reserved name>
• FLAT accepted as segment attribute.
• symbol type conflicts are now detected and reported as errors.
• EXTERNDEF accepts structured types and pointer to types.
• /Cp cmdline option added to make JWasm preserve case of identifiers.
• operators LOW, HIGH, LOWWORD, HIGHWORD, OPATTR, TYPE, .TYPE, WIDTH, MASK.
• PROC improved: procedure parameters and locals are now true symbols with type information and all types supported by MASM are allowed.
• /Fl cmdline switch extended, additionally displays macros, structures, records and typedefs.
• /EP cmdline switch to display preprocessed lines on stdout.
• CATSTR, SUBSTR, SIZESTR and INSTR, as well their macro function sisters @CatStr, @SubStr, @SizeStr and @InStr.
• ECHO directive.
• EQU/TEXTEQU are handled exactly the way MASM does it.
• macro functions (EXITM).
• Types REAL4, REAL8 and REAL10 .
• HLL features (.IF, .ENDIF, .WHILE, .REPEAT, .BREAK, ...).
• predefined equates @Cpu and @CurSeg added.
• Conditional directives (ELSEIFB, ELSEIFIDN, ...) added.
• evaluation operator % supported.
• literal-character operator ! supported.
• -D commandline option will always define a "text macro" and won't try to convert it to a number.
• PURGE directive.
• WHILE directive.
• ASSUME <stdreg>: ptr <qualified type> supported.
• @Environ macro function supported.

• text equates were handled pretty different compared to the way MASM does it,
• fixup of start address now refers to the group of the start address's segment. WASM supplied in OW v1.7a still has problems if the start address is in a segment which isn't the first one in a group.
• EXTERNDEFs which aren't referenced in the source caused a EXTDEF entry to be created in the object module.
• SIZEOF (sometimes?) returned double the size of a variable.
• structure field names were stored in the global symbol table. This caused various problems and often bad code was created.
• some "reserved" words in WASM, which aren't reserved in MASM were removed from this list: "ERROR", "PRIVATE", "COMMON", "EXPORT", "CASEMAP",...
• quotes and curly-bracket delimiting strings were removed during the tokenisation process. This isn't MASM compatible.
• string equates were "evaluated" very early, making it impossible to define a string equate which contained another string equate.
• a macro "local" directive caused a text equate with identical name to be generated or changed.
• alignment argument for STRUCTs was silently ignored.
• macro parameters in the macro definition were expanded. Thus it was impossible to give macro parameters a name which was already used in the namespace (for example the name of a previously defined macro).
• a macro name given as parameter in a IFDEF/IFNDEF line was "evaluated", which is a bad idea.
• if a source line ends with a comma, it was generally concatenated with the next line. This caused problems with invokation of macros with "empty" arguments. The automatic concatenation is now done only if a text item (enclosed in <> or {}) is still open at the end of the line and last character of the line is a comma.
• If many errors occured, WASM exited and didn't delete the zero-sized object module.
• defining arrays with zero items caused a protection fault.
• it was impossible to redefine a macro.
• ALIAS directive syntax differed from MASM's one.