部分宏匯編初步ppt課件

1、name STRUCfield-declarationsname ENDS 其中，字段為組成構(gòu)造的各個(gè)內(nèi)部變量，和普通DB/DW等變量的聲明是一樣的Employee STRUCIdNum DB 000000000LastName DB 30 DUP(0)Years DW 0SalaryHistory DW 4 DUP(0)Employee ENDS000000000(null)00000SalaryHistoryLastnameYearsIdnumCOORD STRUCTX DW ? ; offset 00Y DW ? ; offset 02COORD ENDS.datapoint1 COOR

2、D point2 COORD worker Employee emp Employee NumPoints = 3AllPoints COORD NumPoints DUP()CS_Dept Employee 20 DUP()accounting Employee 10 DUP().dataworker Employee mov AX,TYPE Employee ; 49mov AX,SIZE Employee ; 49mov AX,SIZE worker ; 49mov AX,TYPE Employee.SalaryHistory ; 2mov AX,LENGTH Employee.Sala

3、ryHistory ; 4mov AX,SIZE Employee.SalaryHistory ; 8Employee STRUC; bytesIdNum DB 000000000; 9LastName DB 30 DUP(0); 30Years DW 0; 2SalaryHistory DW 4 DUP(0); 8Employee ENDS; 49mov dx,worker.Yearsmov worker.SalaryHistory,2000 ; first salarymov worker.SalaryHistory+4,3000 ; second salarymov dx,OFFSET

4、worker.LastNamemov si,OFFSET workermov ax,(Employee PTR si).Yearsmov ax,si.Years ; invalid operand (ambiguous)位到低位分配位數(shù)。macroname MACRO parameter-1, parameter-2,.statement-listENDMINPUT MACRO MOV AH, 01H INT 21H AND AL, 0FH ENDM定義:.codeINPUT調(diào)用:從鍵盤輸入09數(shù)字，保管在AL中OUTPUT MACRO charPUSH AXMOV AL,charMOV AH

5、,02HINT 21HPOP AXENDM定義:.codeOUTPUT A調(diào)用:從屏幕輸出一個(gè)字符parametermacrotextargumentreplacesdeclaredinsideconsistsofpassesmacroinvocationstatementgeneratesassemblycode宏、形參和實(shí)參的關(guān)系:REPT constExpressionstatementsENDMConstExpression 為無符號(hào)整數(shù)表達(dá)式，決議了反復(fù)的次數(shù)iVal = 0REPT 100DW iValiVal = iVal + 10ENDM以下的代碼產(chǎn)生 100 個(gè)DW數(shù)據(jù)序列：10, 20, 30, . . . IRP 形參, statementsENDMENDMIRPC 形參, stringstatementsENDMlENDMIF boolean-expressionstatementsELSEstatementsENDIFIF假設(shè)布爾表達(dá)式不為0時(shí)，相應(yīng)的語句塊被匯編；否那么，匯編其它的語句塊。IFE假設(shè)布爾表達(dá)式為0時(shí)，那么匯編舉例：p176WriteStr MACRO stringIFB ECHO -ECHO * Error: parameter missing in mWriteStrECHO * (no code genera