677 lines
21 KiB
ObjectPascal
677 lines
21 KiB
ObjectPascal
{$optimize 7}
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{---------------------------------------------------------------}
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{ }
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{ Asm }
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{ }
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{ This unit implements the built-in assembler and }
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{ disassembler. }
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{ }
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{ External Subroutines: }
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{ }
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{ AsmFunction - assemble an assembly language function }
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{ AsmStatement - assemble some in-line code }
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{ InitAsm - initialize the assembler }
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{ }
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{---------------------------------------------------------------}
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unit Asm;
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interface
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{$LibPrefix '0/obj/'}
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uses CCommon, Table, CGI, Scanner, Symbol, MM, Expression;
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{$segment 'CC'}
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procedure AsmFunction (variable: identPtr);
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{ Assemble an assembly language function }
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{ }
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{ parameters: }
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{ variable - pointer to the function variable }
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procedure AsmStatement;
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{ Assemble some in-line code }
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procedure InitAsm;
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{ Initialize the assembler }
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{---------------------------------------------------------------}
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implementation
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{---------------------------------------------------------------}
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var
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doingAsmFunction: boolean; {was AsmStatement called from AsmFunction?}
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{- Imported from the parser: -----------------------------------}
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procedure Match (kind: tokenEnum; err: integer); extern;
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{ insure that the next token is of the specified type }
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{ }
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{ parameters: }
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{ kind - expected token kind }
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{ err - error number if the expected token is not found }
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{- Private routines --------------------------------------------}
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function FindLabel (name: stringPtr; definition: boolean): integer;
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{ Find a label in the label list. If none exists, create one. }
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{ }
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{ parameters: }
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{ name - name of the label }
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{ definition - is this the defining point? }
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label 1;
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var
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lb: gotoPtr; {work pointer}
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lnum: integer; {label number}
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begin {FindLabel}
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lb := gotoList; {try to find an existing label}
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while lb <> nil do begin
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if lb^.name^ = name^ then begin
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lnum := lb^.lab;
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goto 1;
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end;
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lb := lb^.next;
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end; {while}
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lb := pointer(Malloc(sizeof(gotoRecord))); {no label record exists: create one}
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lb^.next := gotoList;
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gotoList := lb;
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lb^.name := name;
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lnum := GenLabel;
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lb^.lab := lnum;
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lb^.defined := false;
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1:
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if definition then begin
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if lb^.defined then
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Error(77)
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else begin
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lb^.defined := true;
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Gen1(dc_lab, lb^.lab);
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end; {else}
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end; {if}
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FindLabel := lnum;
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end; {FindLabel}
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{- Global routines ---------------------------------------------}
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procedure AsmFunction {variable: identPtr};
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{ Assemble an assembly language function }
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{ }
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{ parameters: }
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{ variable - pointer to the function variable }
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var
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tl: tempPtr; {work pointer}
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begin {AsmFunction}
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{process the statements}
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doingAsmFunction := true;
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AsmStatement;
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doingAsmFunction := false;
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{finish the subroutine}
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Gen0 (dc_enp); {finish the segment}
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CheckGotoList; {make sure all labels are declared}
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while tempList <> nil do begin {dump the local labels}
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tl := tempList;
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tempList := tl^.next;
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dispose(tl);
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end; {while}
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LInit; {dispose of the local memory pool}
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nameFound := false; {no pc_nam for the next function (yet)}
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doingFunction := false; {no longer doing a function}
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end; {AsmFunction}
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procedure AsmStatement;
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{ Assemble some in-line code }
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label 1,2,3,99;
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var
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i: integer; {loop variable}
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lnum: integer; {label number}
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name: packed array[0..3] of char; {op code name}
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opc: opcode; {operation code enumeration}
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opname: tokenType; {operation code token}
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optype: operands; {operand type}
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{set by Exp}
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{----------}
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isConstant: boolean; {constant? (or identifier expression}
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operand: tokenType; {operand (if not isConstant)}
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operation: (plus,minus,none); {kind of operation}
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size: (directPage,absoluteaddress,longAddress); {size of the operand}
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value: longint; {expression value}
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procedure Skip;
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{ An error was found: skip to the end & quit }
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begin {Skip}
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while not (token.kind in [rbracech,eofsy]) do
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NextToken;
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goto 99;
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end; {Skip}
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procedure Exp (stop: tokenSet; EOLallowed: boolean);
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{ Parse an expression in an operand }
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{ }
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{ Parameters: }
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{ stop - stop symbols }
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{ EOLallowed - can the expression end with EOL? }
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{ }
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{ Outputs: }
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{ isConstant - constant? (or identifier expression) }
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{ operand - operand (if not isConstant) }
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{ operation - kind of operation }
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{ size - size of the operand }
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{ value - expression value }
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var
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forced: boolean; {is the expression type forced?}
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i: 0..maxint; {loop/index variable}
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id: identPtr; {identifier}
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tcode: intermediate_code; {temp storage for code}
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begin {Exp}
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if token.kind in [ltch,barch,gtch] {allow for operand size forcing}
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then begin
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forced := true;
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if token.kind = ltch then
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size := directPage
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else if token.kind = barch then
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size := absoluteaddress
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else {if token.kind = gtch then}
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size := longAddress;
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NextToken;
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end {if}
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else
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forced := false;
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if EOLallowed then begin {handle expressions that can end at eol}
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reportEOL := true;
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stop := stop+[eolsy];
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end; {if}
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if token.kind = ident then begin {handle expressions with an identifier}
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if not forced then
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size := absoluteaddress;
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isConstant := false;
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operand := token;
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id := FindSymbol(token, variableSpace, false, true);
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if id = nil then begin
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code^.llab := FindLabel(token.name, false);
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if (not forced) and (not smallMemoryModel) then
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size := longAddress;
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end {if}
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else begin
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id^.used := true;
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operand.symbolPtr := id;
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if id^.storage in [stackFrame,parameter] then begin
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code^.slab := id^.lln;
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if not forced then
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size := directPage;
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end {if}
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else begin
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code^.lab := id^.name;
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if id^.itype^.kind = functionType then begin
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if id^.itype^.isPascal then begin
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code^.lab := pointer(Malloc(length(id^.name^)+1));
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CopyString(pointer(code^.lab), pointer(id^.name));
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for i := 1 to length(code^.lab^) do
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if code^.lab^[i] in ['a'..'z'] then
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code^.lab^[i] := chr(ord(code^.lab^[i]) & $5F);
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end; {if}
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end; {if}
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if (not forced) and (not smallMemoryModel) then
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size := longAddress;
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end; {else}
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end; {else}
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NextToken;
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if token.kind in [plusch,minusch] then begin
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if token.kind = plusch then
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operation := plus
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else
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operation := minus;
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NextToken;
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tcode := code^;
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Expression(arrayExpression, stop);
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code^ := tcode;
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value := expressionValue;
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if expressionType^.kind = scalarType then
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if expressionType^.baseType <= cgUWord then
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value := value & $0000FFFF;
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end {if}
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else begin
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operation := none;
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value := 0;
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end; {else}
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end {if token = ident}
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else begin {constant expression}
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operation := none;
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isConstant := true;
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tcode := code^;
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Expression(arrayExpression, stop);
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code^ := tcode;
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value := expressionValue;
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if expressionType^.kind = scalarType then
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if expressionType^.baseType <= cgUWord then
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value := value & $0000FFFF;
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if not forced then
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if long(value).msw = 0 then begin
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if long(value).lsw & $FF00 = 0 then
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size := directPage
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else
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size := absoluteaddress;
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end {if}
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else
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size := longAddress;
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end; {else}
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reportEOL := false;
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if token.kind = eolsy then
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NextToken;
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end; {Exp}
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function RegCompare (str: stringPtr; reg: char): boolean;
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{ Compare a string to a register constant }
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{ }
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{ parameters: }
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{ str - string pointer }
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{ reg - register character }
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begin {RegCompare}
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RegCompare := false;
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if length(str^) = 1 then
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RegCompare := chr(ord(str^[1]) | $20) = reg;
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end; {RegCompare}
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procedure CheckForComment;
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{ Handle an assembly language comment (ignore chars from ; to EOL) }
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begin {CheckForComment}
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while token.kind = semicolonch do begin
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while not (charKinds[ord(ch)] in [ch_eol,ch_eof]) do
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NextCh;
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NextCh;
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NextToken;
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end; {if}
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end; {CheckForComment}
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begin {AsmStatement}
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Match(lbracech,27);
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while not (token.kind in [rbracech,eofsy]) do begin
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{find the label and op-code}
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CheckForComment;
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if token.kind <> ident then begin {error if not an identifier}
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Error(9);
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Skip;
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end; {if}
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opname := token;
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NextToken;
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while token.kind = colonch do begin {define a label}
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lnum := FindLabel(opname.name, true);
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NextToken;
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CheckForComment;
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if token.kind <> ident then
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Skip;
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opname := token;
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NextToken;
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end; {while}
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{identify the op-code}
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if length(opname.name^) = 3 then begin
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name := opname.name^;
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for i := 1 to 3 do
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if name[i] in ['A'..'Z'] then
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name[i] := chr(ord(name[i]) | $20);
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for opc := o_adc to o_xce do
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if names[opc] = name then
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goto 1;
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end; {if}
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Error(95);
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Skip;
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1: code^.q := 0; {default to no flags}
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{handle general operand instructions}
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if opc <= o_tsb then begin
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optype := op;
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if token.kind = lparench then begin
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NextToken;
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Exp([commach,rparench], false);
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if token.kind = commach then begin
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NextToken;
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if token.kind = ident then begin
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if RegCompare(token.name, 'x') then begin
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NextToken;
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Match(rparench,12);
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if size = directPage then
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optype := i_dp_x
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else if size = absoluteaddress then
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optype := i_op_x
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else
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Error(96);
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end {if}
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else if RegCompare(token.name, 's') then begin
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NextToken;
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Match(rparench,12);
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Match(commach,86);
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if token.kind = ident then begin
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if RegCompare(token.name, 'y') then
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NextToken
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else
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Error(97);
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end {if}
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else
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Error(97);
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if size = directPage then
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optype := i_dp_s_y
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else Error(96);
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end {else if}
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else
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Error(97);
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end {if token.kind = ident}
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else Error(97);
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end {if token.kind = commach}
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else if token.kind = rparench then begin
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NextToken;
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if token.kind = commach then begin
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NextToken;
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if token.kind = ident then begin
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if RegCompare(token.name, 'y') then
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NextToken
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else
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Error(97);
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end {if}
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else Error(97);
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if size = directPage then
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optype := i_dp_y
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else Error(96);
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end {if}
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else begin
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if size = directPage then
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optype := i_dp
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else if size = absoluteaddress then
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optype := i_op
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else
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Error(96);
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end; {else}
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end {else if token.kind = rparench}
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else Error(12);
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end {if}
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else if token.kind = lbrackch then begin
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NextToken;
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Exp([commach,rbrackch], false);
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Match(rbrackch,24);
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if token.kind = commach then begin
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NextToken;
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if token.kind = ident then begin
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if RegCompare(token.name, 'y') then
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NextToken
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else
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Error(97);
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end {if}
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else Error(97);
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if size = directPage then
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optype := li_dp_y
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else Error(96);
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end {if}
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else begin
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if size = directPage then
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optype := li_dp
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else if size = absoluteaddress then
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optype := i_la
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else
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Error(96);
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end; {else}
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end {else if}
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else if token.kind = poundch then begin
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optype := imm;
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NextToken;
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if token.kind = ltch then begin
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NextToken;
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Exp([semicolonch], true);
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end {if}
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else if token.kind = gtch then begin
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NextToken;
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Exp([semicolonch], true);
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if isConstant then
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value := value >> 8
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else
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code^.q := shift8;
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end {else if}
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else if token.kind = carotch then begin
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NextToken;
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Exp([semicolonch], true);
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if isConstant then
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value := value >> 16
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else
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code^.q := shift16;
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end {else if}
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else
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Exp([semicolonch], true);
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end {else if}
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else begin
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if token.kind = ident then
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if RegCompare(token.name, 'a') then begin
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optype := acc;
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NextToken;
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goto 2;
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end; {if}
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Exp([commach,semicolonch], true);
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if token.kind = commach then begin
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NextToken;
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if token.kind = ident then begin
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if RegCompare(token.name, 'x') then begin
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NextToken;
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if size = directPage then
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optype := dp_x
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else if size = absoluteaddress then
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optype := op_x
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else
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optype := long_x;
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end {if}
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else if RegCompare(token.name, 'y') then begin
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NextToken;
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if size = directPage then
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optype := dp_y
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else if size = absoluteaddress then
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optype := op_y
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else
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Error(96);
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end {else if}
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else if RegCompare(token.name, 's') then begin
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NextToken;
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if size = directPage then
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optype := dp_s
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else Error(96);
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end {else if}
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else Error(97);
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end {if token.kind = ident}
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else Error(97);
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end {if}
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else begin
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if size = directPage then
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optype := dp
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else if size = absoluteaddress then
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optype := op
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else
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optype := la;
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end; {else}
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end; {else}
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2: {make sure the operand is valid}
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if nopcodes[opc,optype] = 0 then begin
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if optype = i_dp_x then
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optype := i_op_x
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else if optype = i_dp then
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optype := i_op
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else if optype = dp then
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optype := op
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else if optype = dp_x then
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optype := op_x
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else if optype = dp_y then
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optype := op_y;
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if nopcodes[opc,optype] = 0 then
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if optype = op then
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optype := la;
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if nopcodes[opc,optype] = 0 then
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Error(98);
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end; {if}
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code^.s := nopcodes[opc,optype];
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if optype = acc then
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code^.r := ord(implied)
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else if optype = imm then
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code^.r := ord(imm)
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else if optype in [la,long_x] then
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code^.r := ord(longabsolute)
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else if optype in [op,op_x,op_y,i_op,i_op_x,i_la] then
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code^.r := ord(absolute)
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else
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code^.r := ord(direct);
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end {if opc <= o_tsb}
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{handle data declarations}
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else if opc <= o_dcl then begin
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Exp([semicolonch], true);
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if opc = o_dcb then begin
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code^.s := d_dcb;
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code^.r := ord(direct);
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end {if}
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else if opc = o_dcw then begin
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code^.s := d_dcw;
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code^.r := ord(absolute);
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end {else if}
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else begin
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code^.s := d_dcl;
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code^.r := ord(longabsolute);
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end; {else}
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end {if opc <= o_dcl}
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{handle the brk instruction}
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else if opc = o_brk then begin
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Exp([semicolonch], true);
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code^.r := ord(direct);
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code^.s := 0;
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end {if opc = o_brk}
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{handle the wdm instruction (treated as having a one-byte operand)}
|
|
else if opc = o_wdm then begin
|
|
Exp([semicolonch], true);
|
|
code^.r := ord(direct);
|
|
code^.s := $42;
|
|
end {if opc = o_wdm}
|
|
|
|
{handle moves}
|
|
else if opc in [o_mvn,o_mvp] then begin
|
|
if opc = o_mvn then
|
|
code^.s := $54
|
|
else
|
|
code^.s := $44;
|
|
Gen0(pc_nat);
|
|
code^.s := d_bmov;
|
|
code^.r := ord(immediate);
|
|
Exp([commach,semicolonch], false);
|
|
if isConstant then begin
|
|
code^.opnd := long(value).msw;
|
|
code^.q := 0;
|
|
end {if}
|
|
else begin
|
|
code^.opnd := value;
|
|
code^.q := shift16;
|
|
end; {else}
|
|
Gen0(pc_nat);
|
|
Match(commach,86);
|
|
code^.s := d_bmov;
|
|
code^.r := ord(immediate);
|
|
Exp([semicolonch], true);
|
|
if isConstant then begin
|
|
code^.opnd := long(value).msw;
|
|
code^.q := 0;
|
|
end {if}
|
|
else begin
|
|
code^.opnd := value;
|
|
code^.q := shift16;
|
|
end; {else}
|
|
goto 3;
|
|
end {if opc in [o_mvn,o_mvp]}
|
|
|
|
{handle relative branches}
|
|
else if opc <= o_bvs then begin
|
|
code^.s := ropcodes[opc];
|
|
if token.kind = ident then begin
|
|
code^.llab := FindLabel(token.name, false);
|
|
NextToken;
|
|
code^.lab := nil;
|
|
if opc in [o_brl,o_per] then
|
|
code^.r := ord(longrelative)
|
|
else
|
|
code^.r := ord(relative);
|
|
goto 3;
|
|
end {if}
|
|
else Error(97);
|
|
end {else if opc <= o_bvs}
|
|
|
|
{handle implied operand instructions}
|
|
else begin
|
|
code^.s := iopcodes[opc];
|
|
code^.r := ord(implied);
|
|
end;
|
|
|
|
{generate the code}
|
|
if operation = minus then
|
|
code^.opnd := -value
|
|
else
|
|
code^.opnd := value;
|
|
3: Gen0(pc_nat);
|
|
|
|
CheckForComment;
|
|
end; {while}
|
|
99:
|
|
if doingAsmFunction then
|
|
useGlobalPool := true;
|
|
Match(rbracech,23);
|
|
end; {AsmStatement}
|
|
|
|
|
|
procedure InitAsm;
|
|
|
|
{ Initialize the assembler }
|
|
|
|
begin {AsmInit}
|
|
doingAsmFunction := false;
|
|
end; {AsmInit}
|
|
|
|
end.
|