OpenBIOS September 2012

openbios@openbios.org

9 participants
21 discussions

Local variable support
by Programmingkid 13 Dec '12

13 Dec '12

The following code is for the use of local variables in OpenBIOS. I was able to successfully make a word that used local variables. The work isn't complete. There is still work to be done with the INTERPRET word. The LFIND word has be implemented in the INTERPRET word for local variables to be recognized during the compile state. I just need a C-like CONTINUE word to go back to the start of a loop to fix all my problems with INTERPRET. Maybe someone knows a better way of adding LFIND to INTERPRET. I would appreciate any comments, suggestions, or advice for the following code. \ Creates an array variable : ARRAY ( cellCount - ) DEPTH 0= IF CR ." Please specify an array size." CR EXIT THEN \ Compile-time behavior CREATE CELL * ALLOT \ creates and initializes the instance DOES> \ Run-time behavior DEPTH 2 < IF CR ." Please specify an index number." CR drop \ removes the address of the array instance -1 throw \ stop normal execution after error THEN SWAP CELL * + \ Calculates address to return ; immediate \ Declare the local-base-address VALUE 0 VALUE local-base-address \ returns the base address used for the local words : getBaseAddress ( - addr ) local-base-address ; \ sets the base address used for the local words : setBaseAddress ( addr - ) TO local-base-address ; \ Sets the first local variable's value : Local0! ( x - ) 0 CELL * getBaseAddress + ! ; \ Sets the second local variable's value : Local1! ( x - ) 1 CELL * getBaseAddress + ! ; \ Sets the third local variable's value : Local2! ( x - ) 2 CELL * getBaseAddress + ! ; \ Sets the fourth local variable's value : Local3! ( x - ) 3 CELL * getBaseAddress + ! ; \ Sets the fifth local variable's value : Local4! ( x - ) 4 CELL * getBaseAddress + ! ; \ Sets the sixth local variable's value : Local5! ( x - ) 5 CELL * getBaseAddress + ! ; \ Sets the seventh local variable's value : Local6! ( x - ) 6 CELL * getBaseAddress + ! ; \ Sets the eighth local variable's value : Local7! ( x - ) 7 CELL * getBaseAddress + ! ; \ Sets the ninth local variable's value : Local8! ( x - ) 8 CELL * getBaseAddress + ! ; \ Sets the tenth local variable's value : Local9! ( x - ) 9 CELL * getBaseAddress + ! ; \ Sets the eleventh local variable's value : Local10! ( x - ) 10 CELL * getBaseAddress + ! ; \ Sets the twelfth local variable's value : Local11! ( x - ) 11 CELL * getBaseAddress + ! ; \ **** Calculates the needed amount of memory for local variables **** 0 value variableCount : calculateNeededMemory ( "char" - n ) 0 TO variableCount >in @ \ keep track of where the pointer was begin parse-word 0= if \ if there is no more text to parse drop true else dup " ;" comp 0= if \ if the semicolon is encountered drop \ drop the duplicated address false else " }" comp 0= if \ if '}' character is encountered true \ end loop because '}' marks end of local variables else variableCount 1 + TO variableCount false then then then until >in ! \ reset the pointer variableCount CELL * ; \ **** allocates the memory for local variables **** : allocateMemory ( n - addr ) alloc-mem dup 0= if drop cr cr 10 spaces abort" Failed to allocate memory for local variables!" cr cr then ; \ Declares the size of the local variable table 48 CONSTANT localTableSize \ Declare the local variable table localTableSize ARRAY localVariableTable \ Keeps track of end of array 0 VALUE arrayCount \ gets the number of records in the local variable table : getLocalRecordCount arrayCount 4 / ; \ Clears the local variable table : initLocalTable ( - ) \ free all the dynamically allocated memory arrayCount 0 ?do I 3 + localVariableTable @ ( addr ) free-mem ( ) 4 +loop 0 localVariableTable localTableSize erase 0 TO arrayCount ; \ Adds a local variable symbol to the local variable table : addLocal ( addr len order initflag - ) depth 4 < if cr ." The stack needs at least 4 values to add a local variable." cr exit then \ add to the table arrayCount 0 + localVariableTable ! \ initflag arrayCount 1 + localVariableTable ! \ order arrayCount 2 + localVariableTable ! \ len arrayCount 3 + localVariableTable ! \ addr \ allocate memory for the symbol arrayCount 2 + localVariableTable @ ( length ) alloc-mem ( memaddr ) dup ( memaddr memaddr ) dup ( memaddr memaddr memaddr ) \ called only when memaddr = 0 0= ( memaddr memaddr flag ) if cr ." Failed to allocate memory in addLocal!" cr ( memaddr memaddr ) then \ copy local variable name to a safe location arrayCount 3 + localVariableTable @ ( memaddr memaddr addr ) swap ( memaddr addr memaddr ) arrayCount 2 + localVariableTable @ ( memaddr addr memaddr length ) move ( memaddr ) arrayCount 3 + localVariableTable ! ( ) \ increment arrayCount arrayCount 4 + TO arrayCount ; \ prints the local variable table : printLocalTable arrayCount 0= if cr ." No variables loaded" cr exit then arrayCount 0 ?do cr ." Variable name: " I 3 + localVariableTable @ I 2 + localVariableTable @ type ." Order: " I 1 + localVariableTable @ . ." Init Flag: " I 0 + localVariableTable @ . 4 +loop ; \ Finds a local variable symbol in the local variable table \ Returns its order or -1 on failure : getOrder ( addr len - order ) \ if the address and length are missing depth 2 < if cr ." Address and length are required on the stack to use getOrder!" cr -1 throw \ ends execution then arrayCount 0 ?do over ( addr len addr ) I 3 + ( addr len addr addrindex ) localVariableTable @ ( addr len addr addr1 ) 2 pick ( addr len addr addr1 len ) comp ( addr len n ) 0= ( addr len flag ) if \ if the symbol is found 2drop ( addr len - ) I 1 + localVariableTable @ unloop exit then 4 \ increment the index by 4 +loop 2drop ( addr len - ) -1 \ returns -1 for the order if the symbol is not found ; \ **** read the local variables in the input stream **** 0 VALUE useTopStackValue 0 VALUE index 0 VALUE localVariableMemory : readLocalVariables ( "char" - ) 0 TO index true TO useTopStackValue begin parse-word ( addr len ) dup ( addr len len ) 0> ( addr len flag ) while ( addr len ) 2dup ( addr len addr len ) drop ( addr len addr ) " }" ( addr len addr addr len ) comp ( addr len flag ) 0= ( addr len flag ) if ( addr len ) \ if end of local variables drop ( addr ) drop ( ) exit ( ) then 2dup ( addr len addr len ) drop ( addr len addr ) " ;" ( addr len addr addr len ) comp ( addr len flag ) 0= ( addr len flag ) if ( addr len ) \ if not using top stack value for local variables false TO useTopStackValue ( addr len ) else \ add local variable to table index useTopStackValue ( addr len order useTopStackValue ) addLocal ( ) index 1 + TO index \ increment index then repeat drop ( addr ) drop ( ) ; \ FALSE VALUE usingLocals \ not needed because it is in the interpreter.fs file \ declare the local stack 1000 ARRAY localStack \ declare the stack top pointer 0 VALUE localStackTop \ Adds to the top of the local stack : pushLocalStack ( x - L:x ) localStackTop localStack ! ( x - ) localStackTop 1 + TO localStackTop ; \ Removes the top local stack value and places it into the data stack : popLocalStack ( L:x - x ) localStackTop localStack @ localStackTop 1 - TO localStackTop ; 12 CONSTANT localVariableLimit \ ***** sets up local variables ****** : { ( "char" - ) initLocalTable \ localVariableLimit CELL * ( memorySize ) calculateNeededMemory ( memorySize ) allocateMemory ( memorySize - addr ) TO localVariableMemory ( ) readLocalVariables ( ) TRUE TO usingLocals \ add code to the current definition \ saves the old base address postpone getBaseAddress postpone pushLocalStack \ sets the base address to this definition's reserved memory localVariableMemory postpone literal postpone setBaseAddress \ add code to initialize the variables if needed arrayCount 0 ?do I 0 + localVariableTable @ ( flag ) \ get the init flag true ( flag true ) = ( flag1 ) if I 4 / ( variable number ) case 0 of ['] Local0! , endof 1 of ['] Local1! , endof 2 of ['] Local2! , endof 3 of ['] Local3! , endof 4 of ['] Local4! , endof 5 of ['] Local5! , endof 6 of ['] Local6! , endof 7 of ['] Local7! , endof 8 of ['] Local8! , endof 9 of ['] Local9! , endof 10 of ['] Local10! , endof 11 of ['] Local11! , endof cr ." Can't save to local variable! " cr exit endcase then 4 +loop ; immediate \ declares this word as a compiler directive \ sets values for local variables : -> ( - ) parse-word ( addr len ) getOrder ( order ) dup ( order order ) -1 = ( order flag ) if \ if the symbol isn't found cr ." Symbol is not a local variable! " cr drop ( ) exit then case 0 of ['] Local0! , endof 1 of ['] Local1! , endof 2 of ['] Local2! , endof 3 of ['] Local3! , endof 4 of ['] Local4! , endof 5 of ['] Local5! , endof 6 of ['] Local6! , endof 7 of ['] Local7! , endof 8 of ['] Local8! , endof 9 of ['] Local9! , endof 10 of ['] Local10! , endof 11 of ['] Local11! , endof cr ." Can't save to local variable! " cr exit endcase ; immediate \ returns the first local variable's value : Local0@ CELL 0 * getBaseAddress + @ ; \ returns the second local variable's value : Local1@ CELL 1 * getBaseAddress + @ ; \ returns the third local variable's value : Local2@ CELL 2 * getBaseAddress + @ ; \ returns the fourth local variable's value : Local3@ CELL 3 * getBaseAddress + @ ; \ returns the fifth local variable's value : Local4@ CELL 4 * getBaseAddress + @ ; \ returns the sixth local variable's value : Local5@ CELL 5 * getBaseAddress + @ ; \ returns the seventh local variable's value : Local6@ CELL 6 * getBaseAddress + @ ; \ returns the eighth local variable's value : Local7@ CELL 7 * getBaseAddress + @ ; \ returns the ninth local variable's value : Local8@ CELL 8 * getBaseAddress + @ ; \ returns the tenth local variable's value : Local9@ CELL 9 * getBaseAddress + @ ; \ returns the eleventh local variable's value : Local10@ CELL 10 * getBaseAddress + @ ; \ returns the twelfth local variable's value : Local11@ CELL 11 * getBaseAddress + @ ; \ determines if a symbol is a local variable : LFIND ( addr len - ) depth 2 < if \ if the address and length are not on the stack exit then 2dup ( addr len addr len ) getOrder ( addr len addr len - addr len n ) dup ( addr len n - addr len n n ) -1 = if \ if the symbol isn't a local variable drop ( addr len n - addr len ) else \ if the symbol is a local variable case 0 of ['] Local0@ , endof 1 of ['] Local1@ , endof 2 of ['] Local2@ , endof 3 of ['] Local3@ , endof 4 of ['] Local4@ , endof 5 of ['] Local5@ , endof 6 of ['] Local6@ , endof 7 of ['] Local7@ , endof 8 of ['] Local8@ , endof 9 of ['] Local9@ , endof 10 of ['] Local10@ , endof 11 of ['] Local11@ , endof \ default case 2drop ( addr len - ) cr ." Could not compile local variable!" cr TRUE exit endcase 2drop ( addr len - ) ." compiled" \ display this text when entering a local variable symbol FALSE then ; \ Redefine colon to clean up after { : ; usingLocals TRUE = if FALSE TO usingLocals postpone popLocalStack postpone setBaseAddress then postpone ; ; immediate ' lfind is mydefer \ makes lfind work in INTERPRET \ ************ OVERWRITE THESE WORDS IN interpreter.fs *************** Defer mydefer : interpret 0 >in ! begin parse-word dup 0> \ was there a word at all? while usingLocals if mydefer \ need to add a code to continue to the next iteration right here then $find if dup flags? 0<> state @ 0= or if execute else , \ compile mode && !immediate then else \ word is not known. maybe it's a number 2dup $number if span @ >in ! \ if we encountered an error, don't continue parsing type 3a emit -13 throw else -rot 2drop 1 handle-lit then then depth 200 >= if -3 throw then depth 0< if -4 throw then rdepth 200 >= if -5 throw then rdepth 0< if -6 throw then repeat 2drop ; : print-status ( exception -- ) space ?dup if dup sys-debug \ system debug hook case -1 of s" Aborted." type endof -2 of s" Aborted." type endof -3 of s" Stack Overflow." type 0 depth! endof -4 of s" Stack Underflow." type 0 depth! endof -5 of s" Return Stack Overflow." type endof -6 of s" Return Stack Underflow." type endof -13 of s" undefined word." type endof -15 of s" out of memory." type endof -21 of s" undefined method." type endof -22 of s" no such device." type endof -100 of endof \ local variable being used dup s" Exception #" type . 0 state ! endcase else state @ 0= if s" ok" else s" compiled" then type then cr ;

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[PATCH] Adds local variable support to OpenBIOS. Local variable implementation is based on Apple's local variable support in Open Firmware.
by Programmingkid 09 Oct '12

09 Oct '12

This patch has been improved from the last patch. Local variable code now is in its own file. The Array word has also been greatly simplified. Signed-off-by: John Arbuckle <programmingkidx(a)gmail.com> --- forth/bootstrap/interpreter.fs | 51 +++- forth/util/build.xml | 1 + forth/util/locals.fs | 531 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 569 insertions(+), 14 deletions(-) create mode 100644 forth/util/locals.fs diff --git a/forth/bootstrap/interpreter.fs b/forth/bootstrap/interpreter.fs index 5187058..9221cdc 100644 --- a/forth/bootstrap/interpreter.fs +++ b/forth/bootstrap/interpreter.fs @@ -40,26 +40,20 @@ \ 7.3.9.2.4 Miscellaneous dictionary \ -\ interpreter. This word checks whether the interpreted word -\ is a word in dictionary or a number. It honours compile mode -\ and immediate/compile-only words. -: interpret - 0 >in ! - begin - parse-word dup 0> \ was there a word at all? - while - $find +\ Most of the old version of interpret +: old-interpret ( addr len -- ) + $find if dup flags? 0<> state @ 0= or if execute else - , \ compile mode && !immediate + , \ Compile mode && !immediate then - else \ word is not known. maybe it's a number + else \ Word is not known. maybe it's a number 2dup $number if - span @ >in ! \ if we encountered an error, don't continue parsing + span @ >in ! \ If we encountered an error, don't continue parsing type 3a emit -13 throw else @@ -70,9 +64,38 @@ depth 0< if -4 throw then rdepth 200 >= if -5 throw then rdepth 0< if -6 throw then +; + + +Defer lfind-defer +false VALUE using-locals + +\ The refactored interpret - supports local variables +: interpret ( -- ) + 0 >in ! + begin + parse-word ( addr len ) + dup ( addr len len1 ) + 0> ( addr len flag ) \ Was there a word at all? + while ( addr len ) + using-locals true = IF ( addr len ) \ If local variables are being used + 2dup ( addr len addr1 len1 ) + lfind-defer ( addr len flag ) + not IF ( addr len ) \ If symbol is not a local variable + old-interpret ( ) + ELSE \ Else clean up the stack + 2drop ( ) + THEN + + ELSE \ If not using local variables + old-interpret ( addr len -- ) + THEN + repeat - 2drop - ; + 2drop \ Removes the addr len pair if the loop ends at the WHILE word +; + + : refill ( -- ) ib #ib @ expect 0 >in ! ; diff --git a/forth/util/build.xml b/forth/util/build.xml index 4839d2c..d10f35a 100644 --- a/forth/util/build.xml +++ b/forth/util/build.xml @@ -11,6 +11,7 @@ <dictionary name="openbios" target="forth"> <object source="util.fs"/> <object source="pci.fs"/> + <object source="locals.fs"/>  diff --git a/forth/util/locals.fs b/forth/util/locals.fs new file mode 100644 index 0000000..22a6f55 --- /dev/null +++ b/forth/util/locals.fs @@ -0,0 +1,531 @@ +\ File: locals.fs +\ Description: Adds local variable support to OpenBIOS. This is Apple's local variable specification. + + +\ Creates an array variable +: ARRAY ( cellCount -- ) + + \ Compile-time behavior + CREATE CELLS ALLOT ( cellCount -- ) \ Creates and initializes the instance + + \ Run-time behavior + DOES> ( index addr ) + + SWAP CELLS + ( index addr -- addr1 ) \ Calculates address to return +; + + +\ Declare the local-base-address VALUE +0 VALUE local-base-address + +\ Returns the base address used for the local words +: get-base-address ( - addr ) + local-base-address +; + +\ Sets the base address used for the local words +: set-base-address ( addr - ) + TO local-base-address +; + + +\ Sets the first local variable's value +: Local0! ( x - ) + 0 CELLS get-base-address + ! +; + +\ Sets the second local variable's value +: Local1! ( x - ) + 1 CELLS get-base-address + ! +; + +\ Sets the third local variable's value +: Local2! ( x - ) + 2 CELLS get-base-address + ! +; + +\ Sets the fourth local variable's value +: Local3! ( x - ) + 3 CELLS get-base-address + ! +; + +\ Sets the fifth local variable's value +: Local4! ( x - ) + 4 CELLS get-base-address + ! +; + +\ Sets the sixth local variable's value +: Local5! ( x - ) + 5 CELLS get-base-address + ! +; + +\ Sets the seventh local variable's value +: Local6! ( x - ) + 6 CELLS get-base-address + ! +; + +\ Sets the eighth local variable's value +: Local7! ( x - ) + 7 CELLS get-base-address + ! +; + +\ Sets the ninth local variable's value +: Local8! ( x - ) + 8 CELLS get-base-address + ! +; + +\ Sets the tenth local variable's value +: Local9! ( x - ) + 9 CELLS get-base-address + ! +; + +\ Sets the eleventh local variable's value +: Local10! ( x - ) + 10 CELLS get-base-address + ! +; + +\ Sets the twelfth local variable's value +: Local11! ( x - ) + 11 CELLS get-base-address + ! +; + + +\ **** Calculates the needed amount of memory for local variables **** +0 value variableCount +: calculate-needed-memory ( - n ) + 0 TO variableCount + >in @ \ Keep track of where the pointer was + + begin + parse-word + 0= if \ If there is no more text to parse + drop + true + else + dup " ;" comp + 0= if \ If the semicolon is encountered + drop \ Drop the duplicated address + false + else + " }" comp + 0= if \ If '}' character is encountered + true \ End loop because '}' marks end of local variables + else + variableCount 1 + TO variableCount + false + then + then + then + until + + >in ! \ Reset the pointer + variableCount CELLS +; + + +\ **** allocates the memory for local variables **** +: allocate-memory ( n - addr ) + alloc-mem dup 0= if + drop + cr cr 10 spaces abort" Failed to allocate memory for local variables!" cr cr + then +; + + + +\ Declares the size of the local variable table +48 CONSTANT #local-table-elements + +\ Declare the local variable table +#local-table-elements ARRAY local-variable-table + +\ Keeps track of end of array +0 VALUE #filled-local-table-elements + +\ Clears the local variable table +: init-local-table ( - ) + + \ Free all the dynamically allocated memory + #filled-local-table-elements 0 ?do + I 3 + local-variable-table @ ( addr ) + free-mem ( ) + 4 +loop + + 0 local-variable-table #local-table-elements erase + 0 TO #filled-local-table-elements +; + +\ Adds a local variable symbol to the local variable table +: add-local ( addr len order initflag - ) + depth 4 < if + cr ." The stack needs at least 4 values to add a local variable." cr + exit + then + + \ Add to the end of the table + #filled-local-table-elements 0 + local-variable-table ! \ initflag + #filled-local-table-elements 1 + local-variable-table ! \ order + #filled-local-table-elements 2 + local-variable-table ! \ len + #filled-local-table-elements 3 + local-variable-table ! \ addr + + \ Allocate memory for the symbol + #filled-local-table-elements 2 + local-variable-table @ ( length ) + alloc-mem ( memaddr ) + dup ( memaddr memaddr ) + dup ( memaddr memaddr memaddr ) + + \ Called only when memaddr = 0 + 0= if ( memaddr memaddr ) + cr ." Failed to allocate memory in add-local!" cr ( memaddr memaddr ) + then + + \ Copy local variable name to a safe location + #filled-local-table-elements 3 + local-variable-table @ ( memaddr memaddr addr ) + swap ( memaddr addr memaddr ) + #filled-local-table-elements 2 + local-variable-table @ ( memaddr addr memaddr length ) + move ( memaddr ) + #filled-local-table-elements 3 + local-variable-table ! ( ) + + \ Increment #filled-local-table-elements + #filled-local-table-elements 4 + TO #filled-local-table-elements +; + +\ Prints the local variable table +: print-local-table + + #filled-local-table-elements 0= if + cr ." No variables loaded" cr + exit + then + + #filled-local-table-elements 0 ?do + cr ." Variable name: " + I 3 + local-variable-table @ + I 2 + local-variable-table @ + type + + ." Order: " + I 1 + local-variable-table @ . + + ." Init Flag: " + I 0 + local-variable-table @ . + 4 +loop +; + +\ Finds a local variable symbol in the local variable table +\ Returns its order or -1 on failure +: get-order ( addr len - order ) + \ If the address and length are missing + depth 2 < if + cr ." Address and length are required on the stack to use get-order!" cr + -1 throw \ Ends execution + then + + #filled-local-table-elements 0 ?do + over ( addr len addr ) + I 3 + ( addr len addr addrindex ) + local-variable-table @ ( addr len addr addr1 ) + 2 pick ( addr len addr addr1 len ) + + \ Check if lengths of two strings are the same length + dup ( addr len addr addr1 len len ) + I 2 + local-variable-table @ ( addr len addr addr1 len len len1) + = if ( addr len addr addr1 len ) \ If lengths are equal + comp ( addr len flag) + 0= if ( addr len flag ) \ If the symbol is found + 2drop ( ) + I 1 + local-variable-table @ ( order ) + unloop + exit + then + + else \ If the lengths are different + 3drop ( addr len ) + then + + \ Increment the index by 4 + 4 +loop + 2drop ( addr len - ) + -1 \ Returns -1 for the order if the symbol is not found +; + + +\ **** read the local variables in the input stream **** +0 VALUE use-top-stack-value +0 VALUE index +0 VALUE local-variable-memory + +: read-local-variables ( "char" - ) + 0 TO index + true TO use-top-stack-value + + begin + parse-word ( addr len ) + dup ( addr len len ) + 0> ( addr len flag ) + while ( addr len ) + 2dup ( addr len addr len ) + drop ( addr len addr ) + " }" ( addr len addr addr len ) + comp ( addr len flag ) + 0= if ( addr len ) \ If end of local variables + drop ( addr ) + drop ( ) + exit ( ) + then + + 2dup ( addr len addr len ) + drop ( addr len addr ) + " ;" ( addr len addr addr len ) + comp ( addr len flag ) + 0= ( addr len flag ) + + if ( addr len ) \ If not using top stack value for local variables + false TO use-top-stack-value ( addr len ) + 2drop ( ) + else \ Add local variable to table + index use-top-stack-value ( addr len order use-top-stack-value ) + add-local ( ) + index 1 + TO index \ Increment index + then + + repeat + drop ( addr ) + drop ( ) +; + + +\ Sets the stack size +1000 CONSTANT max-stack-size + +\ Declare the local stack +max-stack-size ARRAY local-stack + +\ Declare the stack top pointer +0 VALUE local-stack-top + +\ Adds to the top of the local stack +: push-local-stack ( x - L:x ) + local-stack-top max-stack-size 1 - > + if + cr ." Local stack overflow!" cr + max-stack-size TO local-stack-top \ Sets local-stack-top back to the max size + then + local-stack-top local-stack ! ( x - ) + local-stack-top 1 + TO local-stack-top +; + + +\ Removes the top local stack value and places it into the data stack +: pop-local-stack ( L:x - x ) + local-stack-top 1 - TO local-stack-top \ Decrement local-stack-top + local-stack-top 0< if \ If popping too many items + cr ." Local stack underflow!" cr + 0 TO local-stack-top \ Sets local-stack-top back to zero + abort + then + local-stack-top local-stack @ +; + + +\ ***** sets up local variables ****** +: { ( -- ) + init-local-table + calculate-needed-memory ( memorySize ) + allocate-memory ( memorySize - addr ) + TO local-variable-memory ( ) + read-local-variables ( ) + TRUE TO using-locals + + \ Add code to the current definition + + \ Saves the old base address + postpone get-base-address + postpone push-local-stack + + \ Sets the base address to this definition's reserved memory + local-variable-memory + postpone literal + postpone set-base-address + + \ Add code to initialize the variables if needed + 0 #filled-local-table-elements 4 - ?do + I 0 + local-variable-table @ ( flag ) \ Get the init flag + true ( flag true ) + = ( flag1 ) + if + I 4 / ( variable number ) + case + 0 of ['] Local0! , endof + 1 of ['] Local1! , endof + 2 of ['] Local2! , endof + 3 of ['] Local3! , endof + 4 of ['] Local4! , endof + 5 of ['] Local5! , endof + 6 of ['] Local6! , endof + 7 of ['] Local7! , endof + 8 of ['] Local8! , endof + 9 of ['] Local9! , endof + 10 of ['] Local10! , endof + 11 of ['] Local11! , endof + + cr ." Can't save to local variable! " cr + exit + + endcase + then + -4 +loop + +; immediate \ Declares this word as a compiler directive + + + +\ Sets values for local variables +: -> ( - ) + parse-word ( addr len ) + get-order ( order ) + dup ( order order ) + -1 = ( order flag ) + + if \ If the symbol isn't found + cr ." Symbol is not a local variable! " cr + drop ( ) + exit + then + + case + 0 of ['] Local0! , endof + 1 of ['] Local1! , endof + 2 of ['] Local2! , endof + 3 of ['] Local3! , endof + 4 of ['] Local4! , endof + 5 of ['] Local5! , endof + 6 of ['] Local6! , endof + 7 of ['] Local7! , endof + 8 of ['] Local8! , endof + 9 of ['] Local9! , endof + 10 of ['] Local10! , endof + 11 of ['] Local11! , endof + + cr ." Can't save to local variable! " cr + exit + + endcase + +; immediate + + +\ Returns the first local variable's value +: Local0@ + 0 CELLS get-base-address + @ +; + +\ Returns the second local variable's value +: Local1@ + 1 CELLS get-base-address + @ +; + +\ Returns the third local variable's value +: Local2@ + 2 CELLS get-base-address + @ +; + +\ Returns the fourth local variable's value +: Local3@ + 3 CELLS get-base-address + @ +; + +\ Returns the fifth local variable's value +: Local4@ + 4 CELLS get-base-address + @ +; + +\ Returns the sixth local variable's value +: Local5@ + 5 CELLS get-base-address + @ +; + +\ Returns the seventh local variable's value +: Local6@ + 6 CELLS get-base-address + @ +; + +\ Returns the eighth local variable's value +: Local7@ + 7 CELLS get-base-address + @ +; + +\ Returns the ninth local variable's value +: Local8@ + 8 CELLS get-base-address + @ +; + +\ Returns the tenth local variable's value +: Local9@ + 9 CELLS get-base-address + @ +; + +\ Returns the eleventh local variable's value +: Local10@ + 10 CELLS get-base-address + @ +; + +\ Returns the twelfth local variable's value +: Local11@ + 11 CELLS get-base-address + @ +; + + +\ Determines if a symbol is a local variable +\ Returns true if the symbol is a local variable, false otherwise +: LFIND ( addr len - flag ) + depth 2 < if \ If the address and length are not on the stack + exit + then + + get-order ( addr len - n ) + dup ( n n1 ) + -1 = if ( n ) \ If the symbol isn't a local variable + drop ( ) + false ( flag ) + + else \ If the symbol is a local variable + case ( n ) + 0 of ['] Local0@ , endof + 1 of ['] Local1@ , endof + 2 of ['] Local2@ , endof + 3 of ['] Local3@ , endof + 4 of ['] Local4@ , endof + 5 of ['] Local5@ , endof + 6 of ['] Local6@ , endof + 7 of ['] Local7@ , endof + 8 of ['] Local8@ , endof + 9 of ['] Local9@ , endof + 10 of ['] Local10@ , endof + 11 of ['] Local11@ , endof + + \ Default case + cr ." Could not compile local variable!" cr + TRUE ( flag ) + exit + + endcase + + ." compiled " \ Display this text when entering a local variable symbol + true ( flag ) + then +; + + +\ Redefine colon to clean up after { +: ; + using-locals TRUE = + if + FALSE TO using-locals + postpone pop-local-stack + postpone set-base-address + then + postpone ; +; immediate + +' lfind is lfind-defer \ Makes lfind work in INTERPRET \ No newline at end of file -- 1.7.5.4

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[PATCH 1/3] Fix bug related to opening backup volumes in libhfsp's volume_open().
by Mark Cave-Ayland 07 Oct '12

07 Oct '12

The existing code in hfsp_volume.c tries to locate the alternate volume header at the block vol->maxblocks - 2. Currently for unwrapped HFS+ volumes, vol->maxblocks is never set from the main volume header once it is located and so it tries to find the backup volume at the (dummy) block 3 which inevitably fails. On a secondary note until towards the end of the function, volume_open() assumes the block size is 512 bytes. Therefore once we determine the size of the volume from the main volume header in blocks, we need to convert it from the block size indicated in the volume header to a fixed 512 byte block size in order for the alternate volume header to be located correctly. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland(a)ilande.co.uk> --- openbios-devel/fs/hfsplus/hfsp_volume.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/openbios-devel/fs/hfsplus/hfsp_volume.c b/openbios-devel/fs/hfsplus/hfsp_volume.c index 802d700..e6d9d60 100644 --- a/openbios-devel/fs/hfsplus/hfsp_volume.c +++ b/openbios-devel/fs/hfsplus/hfsp_volume.c @@ -171,7 +171,9 @@ volume_read_wrapper(volume * vol, hfsp_vh* vh) UInt16 signature; char buf[vol->blksize]; char *p = buf; - + int ret; + UInt64 vol_size; + if( volume_readinbuf(vol, buf, 2) ) // Wrapper or volume header starts here return -1; @@ -202,7 +204,14 @@ volume_read_wrapper(volume * vol, hfsp_vh* vh) } else if( signature == HFSP_VOLHEAD_SIG) { /* Native HFS+ volume */ p = buf; // Restore to begin of block - return volume_readbuf(vh, p); + ret = volume_readbuf(vh, p); + if( !ret ) { + /* When reading the initial partition we must use 512 byte blocks */ + vol_size = vh->blocksize * vh->total_blocks; + vol->maxblocks = vol_size / HFSP_BLOCKSZ; + } + + return ret; } else HFSP_ERROR(-1, "Neither Wrapper nor native HFS+ volume header found"); fail: -- 1.7.10.4

3 8

Reducing QEMU's CPU usage
by Programmingkid 29 Sep '12

29 Sep '12

Is there a way to make QEMU not use 100% of the CPU time when OpenBIOS is just at the console? My guess is OpenBIOS is in some kind of loop, polling the keyboard for events, when it should probably be interrupt based. Anybody have a clue as to what we need to change?

2 1

[PATCH] Adds the get-time word to the dictionary. Used to obtain the current time.
by Programmingkid 25 Sep '12

25 Sep '12

The get-time word is a word that is used to obtain the current time. It is used on Apple's Open Firmware. signed-off-by: John Arbuckle <programmingkidx(a)gmail.com> --- forth/system/main.fs | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-) diff --git a/forth/system/main.fs b/forth/system/main.fs index 122ab1f..6867cf3 100644 --- a/forth/system/main.fs +++ b/forth/system/main.fs @@ -58,3 +58,24 @@ variable DIAG-list outer-interpreter ; + +\ Returns the time ( -- second minute hour day month year ) +: get-time + " get-time" ( addr len ) + " rtc" open-dev ( addr len device ) + dup ( addr len device device ) + + 0= if \ if the real-time clock isn't available + cr + 3drop ( ) + true ( flag ) + abort" Sorry but get-time isn't available for your system. " + then + + dup ( addr len device device ) + >R ( addr len device ) ( R: device ) + $call-method ( addr len device -- ) ( R: device ) + R> ( device ) ( R: ) + close-dev ( device -- ) +; + -- 1.7.5.4

3 2

[PATCH] Adds the get-time word to the dictionary. It returns the current time and date on the stack.
by Programmingkid 24 Sep '12

24 Sep '12

Made a few changes to the patch. Thank you Tarl for your suggestions. Signed-Off-By: John Arbuckle <programmingkidx(a)gmail.com> --- forth/system/main.fs | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-) diff --git a/forth/system/main.fs b/forth/system/main.fs index 122ab1f..16d4829 100644 --- a/forth/system/main.fs +++ b/forth/system/main.fs @@ -58,3 +58,25 @@ variable DIAG-list outer-interpreter ; + +\ Returns the time ( -- second minute hour day month year ) +: get-time + " rtc" open-dev ( device ) + dup ( device device ) + + 0= if \ if the real-time clock isn't available + drop ( ) + true ( flag ) + cr + abort" Sorry but get-time isn't available for your system. " + then + + " get-time" ( device addr len ) + rot ( addr len device ) + dup ( addr len device device ) + >r ( addr len device ) ( R: device ) + $call-method ( addr len device -- second minute hour day month year ) ( R: device ) + r> ( device ) ( R: ) + close-dev ( device -- ) +; + -- 1.7.5.4

2 1

Re: [OpenBIOS] [PATCH 3/3] Add initial implementation of "dir" word for HFS+ filesystems.
by Programmingkid 24 Sep '12

24 Sep '12

On Sep 20, 2012, at 1:32 PM, openbios-request(a)openbios.org wrote: > Message: 4 > Date: Tue, 18 Sep 2012 16:31:40 +0100 > From: Mark Cave-Ayland <mark.cave-ayland(a)ilande.co.uk> > To: openbios(a)openbios.org > Cc: Mark Cave-Ayland <mark.cave-ayland(a)ilande.co.uk> > Subject: [OpenBIOS] [PATCH 3/3] Add initial implementation of "dir" > word for HFS+ filesystems. > Message-ID: > <1347982300-14648-3-git-send-email-mark.cave-ayland(a)ilande.co.uk> > > Signed-off-by: Mark Cave-Ayland <mark.cave-ayland(a)ilande.co.uk> > --- > openbios-devel/fs/hfsplus/hfsp_fs.c | 140 ++++++++++++++++++++++++++++++++++- > 1 file changed, 136 insertions(+), 4 deletions(-) > > diff --git a/openbios-devel/fs/hfsplus/hfsp_fs.c b/openbios-devel/fs/hfsplus/hfsp_fs.c > index 83e4d8d..4cc6ddc 100644 > --- a/openbios-devel/fs/hfsplus/hfsp_fs.c > +++ b/openbios-devel/fs/hfsplus/hfsp_fs.c > @@ -437,14 +437,146 @@ hfsp_files_volume_name( hfsp_info_t *mi ) > PUSH(pointer2cell(volname)); From the output you shown us, it looks like the patch works. Those were the files that were on the image file I sent you. I wanted to test it out myself but I couldn't apply your patch. Probably something I did wrong. I suggest applying the patches. They look good.

2 1

local variable patch
by Programmingkid 23 Sep '12

23 Sep '12

I sent my local variable support patch in a few weeks ago and was wondering if someone could commit it.

1 0

Re: [OpenBIOS] Viewing files on HFS volume
by Programmingkid 21 Sep '12

21 Sep '12

On Sep 20, 2012, at 1:32 PM, openbios-request(a)openbios.org wrote: > Okay I've got it - looks like volume_open() currently gets confused when > trying to open a volume where the block size is not 512 bytes (in the > case of your CD image it is 4096 bytes). I have now implemented a basic > dir word (patch to follow shortly) which gives the following output > against your image: > > > Welcome to OpenBIOS v1.0 built on Sep 18 2012 15:11 > > 0 > dir cd:2,\ > 6148 2012-09-11 13:41:40 .DS_Store > 0 2012-09-11 13:41:20 .fseventsd\ > 0 2012-09-11 13:41:20 .HFS+ Private Directory Data?\ > 0 2012-09-11 13:42:08 .TemporaryItems\ > 0 2012-09-11 13:41:20 .Trashes\ > 0 2012-09-11 13:41:40 Folder 1\ > 0 2012-09-11 13:41:44 Folder 2\ > 29 2012-09-11 13:42:08 readme.txt > 0 2012-09-11 13:41:20 HFS+ Private Data\ > ok > 0 > dir cd:2,\.fseventsd > 294 2012-09-11 13:42:57 0000000007c7a66b > 36 2012-09-11 13:41:20 fseventsd-uuid > ok > 0 > dir cd:2,\Folder 1 > (Empty folder) > ok > 0 > dir cd:2,\Folder 2 > (Empty folder) > ok > 0 > dir cd:2,\Folder 3 > Unable to locate path \Folder 3 on filesystem > ok > > > Note that we don't (yet) do autolocation of partitions which is why the > cd:2 notation is needed to manually point towards the second partition > on the CD. Please test and let me know how you get on with your original > Apple CD. > > > ATB, > > Mark. Thank you so much for finally fixing this word. I will test out the patch in a couple of days.

1 0

Obtaining the time
by Programmingkid 21 Sep '12

21 Sep '12

I want to access the time in OpenBIOS. Is there a word to do this already? If not, is there a way to access the time directly from the clock on QEMU using the Macintosh target?

1 0