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< a name = "l1" > < / a > < span class = cF2 > /*< / span > < span class = cF5 >
< a name = "l2" > < / a > < u > -] Main Compiler< / span > < span class = cF0 >
< a name = "l3" > < / a > < / u > < / span > < span class = cF2 > The mini compiler is like the main compiler, except the main compiler's lexical analyser removes comments and does < / span > < span class = cF0 >
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< a name = "l4" > < / a > < / span > < span class = cF2 > preprocessing. < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/Lex.CC.html#l529" > < span class = cF4 > Lex< / span > < / a > < span class = cF2 > (),< / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/CMisc.CC.html#l66" > < span class = cF4 > Echo< / span > < / a > < span class = cF2 > (ON).< / span > < span class = cF0 >
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< a name = "l5" > < / a >
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< a name = "l6" > < / a > < / span > < span class = cF2 > The main compiler generates < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/CompilerA.HH.html#l20" > < span class = cF4 > Intermediate Code< / span > < / a > < span class = cF2 > at the parser stage. See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/ParseExp.CC.html#l302" > < span class = cF4 > ParseExpression< / span > < / a > < span class = cF2 > (), < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/ParseStatement.CC.html#l1020" > < span class = cF4 > ParseStatement< / span > < / a > < span class = cF2 > ().< / span > < span class = cF0 >
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< a name = "l7" > < / a >
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< a name = "l8" > < / a > < / span > < span class = cF2 > The main compiler optimizes See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/CInit.CC.html#l26" > < span class = cF4 > Intermediate Code Attributes< / span > < / a > < span class = cF2 > , < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/OptPass012.CC.html#l374" > < span class = cF4 > Combining Consts< / span > < / a > < span class = cF2 > , < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/OptPass3.CC.html#l627" > < span class = cF4 > Choosing Reg Vars< / span > < / a > < span class = cF2 > . Use < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/CMisc.CC.html#l50" > < span class = cF4 > PassTrace< / span > < / a > < span class = cF2 > () to see < / span > < span class = cF0 >
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< a name = "l9" > < / a > < / span > < span class = cF2 > the optimization stages.< / span > < span class = cF0 >
< a name = "l10" > < / a >
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< a name = "l11" > < / a > < / span > < span class = cF2 > The main compiler makes machine code in the back end. See < / span > < a href = "https://tomawezome.github.io/ZealOS/Kernel/KernelA.HH.html#l1798" > < span class = cF4 > IC Struct< / span > < / a > < span class = cF2 > , < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/ParseLib.CC.html#l289" > < span class = cF4 > COCCompile< / span > < / a > < span class = cF2 > and < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/OptPass789A.CC.html#l596" > < span class = cF4 > OptPass789A< / span > < / a > < span class = cF2 > (), < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/BackA.CC.html#l273" > < span class = cF4 > BackEnd< / span > < / a > < span class = cF2 > . Set < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/CMisc.CC.html#l61" > < span class = cF4 > Trace< / span > < / a > < span class = cF2 > (ON) < / span > < span class = cF0 >
< a name = "l12" > < / a > < / span > < span class = cF2 > to see the output of the backend.< / span > < span class = cF0 >
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< a name = "l13" > < / a > < / span > < span class = cF5 >
< a name = "l14" > < / a > < u > -] Mini Compiler< / span > < span class = cF0 >
< a name = "l15" > < / a > < / u > < / span > < span class = cF2 > For this mini compiler, some things you should know about 64-bit asm:< / span > < span class = cF0 >
< a name = "l16" > < / a >
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< a name = "l17" > < / a > < / span > < span class = cF2 > * Putting a 0x48, known as the REX byte, in front of an instruction makes it 64-bit size.< / span > < span class = cF0 >
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< a name = "l18" > < / a >
< a name = "l19" > < / a > < / span > < span class = cF2 > * " PUSH EAX" , " POP EAX" and " XOR EAX,EAX" will behave as 64-bit even without REX because the stack is always 64 bit and < / span > < span class = cF0 >
< a name = "l20" > < / a > < / span > < span class = cF2 > because the XOR clears the upper 32-bits.< / span > < span class = cF0 >
< a name = "l21" > < / a >
< a name = "l22" > < / a > < / span > < span class = cF2 > It is okay in ZealOS to change RAX, RBX, RCX, RDX, R8 and R9 without restoring them to their original values.< / span > < span class = cF0 >
< a name = "l23" > < / a > < / span > < span class = cF2 > */< / span > < span class = cF0 >
< a name = "l24" > < / a >
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< a name = "l25" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > < / span > < span class = cF3 > TK_EOF< / span > < span class = cF0 > < / span > < span class = cFE > 0< / span > < span class = cF0 >
< a name = "l26" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > TK_NUM < / span > < span class = cFE > 1< / span > < span class = cF0 >
< a name = "l27" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > TK_OP < / span > < span class = cFE > 2< / span > < span class = cF0 >
< a name = "l28" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > TK_LEFT < / span > < span class = cFE > 3< / span > < span class = cF0 >
< a name = "l29" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > TK_RIGHT < / span > < span class = cFE > 4< / span > < span class = cF0 >
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< a name = "l30" > < / a >
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< a name = "l31" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > OP_MUL < / span > < span class = cFE > 1< / span > < span class = cF0 >
< a name = "l32" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > OP_DIV < / span > < span class = cFE > 2< / span > < span class = cF0 >
< a name = "l33" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > OP_ADD < / span > < span class = cFE > 3< / span > < span class = cF0 >
< a name = "l34" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > OP_SUB < / span > < span class = cFE > 4< / span > < span class = cF0 >
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< a name = "l35" > < / a >
< a name = "l36" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > < / span > < span class = cF5 > Lex< / span > < span class = cF0 > (< / span > < span class = cF1 > U8< / span > < span class = cF0 > **_src, < / span > < span class = cF9 > I64< / span > < span class = cF0 > *num)
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< a name = "l37" > < / a > {< / span > < span class = cF2 > //See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/Lex.CC.html#l529" > < span class = cF4 > Lex< / span > < / a > < span class = cF2 > ().< / span > < span class = cF0 >
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< a name = "l38" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *src = *_src;
< a name = "l39" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > i;
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< a name = "l40" > < / a >
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< a name = "l41" > < / a > < / span > < span class = cF1 > while< / span > < span class = cF0 > (< / span > < span class = cF3 > TRUE< / span > < span class = cF0 > )
< a name = "l42" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l43" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (*src)
< a name = "l44" > < / a > {
< a name = "l45" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cFE > 0< / span > < span class = cF0 > :
< a name = "l46" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > ';'< / span > < span class = cF0 > :
< a name = "l47" > < / a > *_src = src;
< a name = "l48" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > TK_EOF< / span > < span class = cF0 > ;
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< a name = "l49" > < / a >
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< a name = "l50" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF3 > CH_SPACE< / span > < span class = cF0 > :
< a name = "l51" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '\r'< / span > < span class = cF0 > :
< a name = "l52" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '\n'< / span > < span class = cF0 > :
< a name = "l53" > < / a > src++;
< a name = "l54" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
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< a name = "l55" > < / a >
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< a name = "l56" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '0'< / span > < span class = cF0 > ...< / span > < span class = cF6 > '9'< / span > < span class = cF0 > :
< a name = "l57" > < / a > i = < / span > < span class = cFE > 0< / span > < span class = cF0 > ;
< a name = "l58" > < / a > < / span > < span class = cF1 > do< / span > < span class = cF0 >
< a name = "l59" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l60" > < / a > i = i * < / span > < span class = cFE > 10< / span > < span class = cF0 > + *src - < / span > < span class = cF6 > '0'< / span > < span class = cF0 > ;
< a name = "l61" > < / a > src++;
< a name = "l62" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l63" > < / a > < / span > < span class = cF1 > while< / span > < span class = cF0 > (< / span > < span class = cF6 > '0'< / span > < span class = cF0 > < = *src < = < / span > < span class = cF6 > '9'< / span > < span class = cF0 > );
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< a name = "l64" > < / a >
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< a name = "l65" > < / a > *num = i;
< a name = "l66" > < / a > *_src = src;
< a name = "l67" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_NUM;
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< a name = "l68" > < / a >
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< a name = "l69" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '*'< / span > < span class = cF0 > :
< a name = "l70" > < / a > *num = OP_MUL;
< a name = "l71" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l72" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_OP;
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< a name = "l73" > < / a >
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< a name = "l74" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '/'< / span > < span class = cF0 > :
< a name = "l75" > < / a > *num = OP_DIV;
< a name = "l76" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l77" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_OP;
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< a name = "l78" > < / a >
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< a name = "l79" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '+'< / span > < span class = cF0 > :
< a name = "l80" > < / a > *num = OP_ADD;
< a name = "l81" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l82" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_OP;
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< a name = "l83" > < / a >
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< a name = "l84" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '-'< / span > < span class = cF0 > :
< a name = "l85" > < / a > *num = OP_SUB;
< a name = "l86" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l87" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_OP;
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< a name = "l88" > < / a >
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< a name = "l89" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > '('< / span > < span class = cF0 > :
< a name = "l90" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l91" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_LEFT;
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< a name = "l92" > < / a >
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< a name = "l93" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF6 > ')'< / span > < span class = cF0 > :
< a name = "l94" > < / a > *_src = src + < / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l95" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > TK_RIGHT;
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< a name = "l96" > < / a >
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< a name = "l97" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l98" > < / a > < / span > < span class = cF5 > throw< / span > < span class = cF0 > ;
< a name = "l99" > < / a > }
< a name = "l100" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
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< a name = "l101" > < / a > }
< a name = "l102" > < / a >
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< a name = "l103" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > PREC_EOF < / span > < span class = cFE > 0< / span > < span class = cF0 >
< a name = "l104" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_TERM< / span > < span class = cF0 > < / span > < span class = cFE > 1< / span > < span class = cF0 >
< a name = "l105" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > < / span > < span class = cFE > 2< / span > < span class = cF0 >
< a name = "l106" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_ADD< / span > < span class = cF0 > < / span > < span class = cFE > 3< / span > < span class = cF0 >
< a name = "l107" > < / a > #< / span > < span class = cF1 > define< / span > < span class = cF0 > PREC_PAREN < / span > < span class = cFE > 4< / span > < span class = cF0 >
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< a name = "l108" > < / a >
< a name = "l109" > < / a > < / span > < span class = cF1 > extern< / span > < span class = cF0 > < / span > < span class = cF9 > I64< / span > < span class = cF0 > Parse(< / span > < span class = cF1 > U8< / span > < span class = cF0 > **_src, < / span > < span class = cF1 > U8< / span > < span class = cF0 > **_dst);
< a name = "l110" > < / a >
< a name = "l111" > < / a > < / span > < span class = cF1 > U0< / span > < span class = cF0 > ParseTerm(< / span > < span class = cF1 > U8< / span > < span class = cF0 > **_src, < / span > < span class = cF1 > U8< / span > < span class = cF0 > **_dst, < / span > < span class = cF9 > I64< / span > < span class = cF0 > prec)
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< a name = "l112" > < / a > {< / span > < span class = cF2 > //See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/ParseExp.CC.html#l302" > < span class = cF4 > ParseExpression< / span > < / a > < span class = cF2 > ().< / span > < span class = cF0 >
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< a name = "l113" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > i;
< a name = "l114" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *src2;
< a name = "l115" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *dst2;
< a name = "l116" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (Parse< / span > < span class = cF7 > (< / span > < span class = cF0 > _src, _dst< / span > < span class = cF7 > )< / span > < span class = cF0 > == < / span > < span class = cF3 > PREC_TERM< / span > < span class = cF0 > )
< a name = "l117" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l118" > < / a > src2 = *_src;
< a name = "l119" > < / a > dst2 = *_dst;
< a name = "l120" > < / a > < / span > < span class = cF1 > while< / span > < span class = cF0 > (< / span > < span class = cF3 > TRUE< / span > < span class = cF0 > )
< a name = "l121" > < / a > {
< a name = "l122" > < / a > < / span > < span class = cF2 > //This is inefficient. The main compiler doesn't back-up like this.< / span > < span class = cF0 >
< a name = "l123" > < / a > i = Parse(& src2, & dst2);
< a name = "l124" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > < = i < prec)
< a name = "l125" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l126" > < / a > *_src = src2;
< a name = "l127" > < / a > *_dst = dst2;
< a name = "l128" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l129" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l130" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l131" > < / a > }
< a name = "l132" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l133" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l134" > < / a > < / span > < span class = cF5 > throw< / span > < span class = cF0 > ;
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< a name = "l135" > < / a > }
< a name = "l136" > < / a >
< a name = "l137" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > Parse(< / span > < span class = cF1 > U8< / span > < span class = cF0 > **_src, < / span > < span class = cF1 > U8< / span > < span class = cF0 > **_dst)
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< a name = "l138" > < / a > {< / span > < span class = cF2 > //See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/ParseExp.CC.html#l302" > < span class = cF4 > ParseExpression< / span > < / a > < span class = cF2 > ().< / span > < span class = cF0 >
< a name = "l139" > < / a > < / span > < span class = cF2 > //See < / span > < a href = "https://tomawezome.github.io/ZealOS/Compiler/OpCodes.DD.html#l716" > < span class = cF4 > Opcode Formats< / span > < / a > < span class = cF2 > for details on asm insts.< / span > < span class = cF0 >
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< a name = "l140" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > i;
< a name = "l141" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *dst = *_dst;
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< a name = "l142" > < / a >
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< a name = "l143" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (< / span > < span class = cF5 > Lex< / span > < span class = cF7 > (< / span > < span class = cF0 > _src, & i< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l144" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l145" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > < / span > < span class = cF3 > TK_EOF< / span > < span class = cF0 > :
< a name = "l146" > < / a > *dst++ = < / span > < span class = cFE > 0x58< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RAX< / span > < span class = cF0 >
< a name = "l147" > < / a > *dst++ = < / span > < span class = cFE > 0xC3< / span > < span class = cF0 > ; < / span > < span class = cF2 > //RET< / span > < span class = cF0 >
< a name = "l148" > < / a > *_dst = dst;
< a name = "l149" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > PREC_EOF;
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< a name = "l150" > < / a >
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< a name = "l151" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TK_NUM:
< a name = "l152" > < / a > *dst++ = < / span > < span class = cFE > 0x48< / span > < span class = cF0 > ; < / span > < span class = cF2 > //REX< / span > < span class = cF0 >
< a name = "l153" > < / a > *dst++ = < / span > < span class = cFE > 0xB8< / span > < span class = cF0 > ; < / span > < span class = cF2 > //MOV RAX,immediate num< / span > < span class = cF0 >
< a name = "l154" > < / a > *dst(< / span > < span class = cF9 > I64< / span > < span class = cF0 > *)++ = i;
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< a name = "l155" > < / a >
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< a name = "l156" > < / a > *dst++ = < / span > < span class = cFE > 0x50< / span > < span class = cF0 > ; < / span > < span class = cF2 > //PUSH RAX< / span > < span class = cF0 >
< a name = "l157" > < / a > *_dst = dst;
< a name = "l158" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_TERM< / span > < span class = cF0 > ;
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< a name = "l159" > < / a >
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< a name = "l160" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TK_LEFT:
< a name = "l161" > < / a > ParseTerm(_src, _dst, PREC_PAREN);
< a name = "l162" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (Parse< / span > < span class = cF7 > (< / span > < span class = cF0 > _src, _dst< / span > < span class = cF7 > )< / span > < span class = cF0 > != PREC_PAREN)
< a name = "l163" > < / a > < / span > < span class = cF5 > throw< / span > < span class = cF0 > ;
< a name = "l164" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_TERM< / span > < span class = cF0 > ;
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< a name = "l165" > < / a >
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< a name = "l166" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TK_RIGHT:
< a name = "l167" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > PREC_PAREN;
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< a name = "l168" > < / a >
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< a name = "l169" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TK_OP:
< a name = "l170" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (i)
< a name = "l171" > < / a > {
< a name = "l172" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > OP_MUL:
< a name = "l173" > < / a > ParseTerm(_src, & dst, < / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > );
< a name = "l174" > < / a > *dst++ = < / span > < span class = cFE > 0x5A< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RDX< / span > < span class = cF0 >
< a name = "l175" > < / a > *dst++ = < / span > < span class = cFE > 0x58< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RAX< / span > < span class = cF0 >
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< a name = "l176" > < / a >
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< a name = "l177" > < / a > *dst++ = < / span > < span class = cFE > 0x48< / span > < span class = cF0 > ; < / span > < span class = cF2 > //REX< / span > < span class = cF0 >
< a name = "l178" > < / a > *dst++ = < / span > < span class = cFE > 0x0F< / span > < span class = cF0 > ;
< a name = "l179" > < / a > *dst++ = < / span > < span class = cFE > 0xAF< / span > < span class = cF0 > ; < / span > < span class = cF2 > //IMUL RAX,RDX< / span > < span class = cF0 >
< a name = "l180" > < / a > *dst++ = < / span > < span class = cFE > 0xC2< / span > < span class = cF0 > ;
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< a name = "l181" > < / a >
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< a name = "l182" > < / a > *dst++ = < / span > < span class = cFE > 0x50< / span > < span class = cF0 > ; < / span > < span class = cF2 > //PUSH RAX< / span > < span class = cF0 >
< a name = "l183" > < / a > *_dst = dst;
< a name = "l184" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > ;
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< a name = "l185" > < / a >
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< a name = "l186" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > OP_DIV:
< a name = "l187" > < / a > ParseTerm(_src, & dst, < / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > );
< a name = "l188" > < / a > *dst++ = < / span > < span class = cFE > 0x5B< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RBX< / span > < span class = cF0 >
< a name = "l189" > < / a > *dst++ = < / span > < span class = cFE > 0x58< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RAX< / span > < span class = cF0 >
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< a name = "l190" > < / a >
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< a name = "l191" > < / a > *dst++ = < / span > < span class = cFE > 0x33< / span > < span class = cF0 > ; < / span > < span class = cF2 > //XOR RDX,RDX< / span > < span class = cF0 >
< a name = "l192" > < / a > *dst++ = < / span > < span class = cFE > 0xD2< / span > < span class = cF0 > ;
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< a name = "l193" > < / a >
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< a name = "l194" > < / a > *dst++ = < / span > < span class = cFE > 0x48< / span > < span class = cF0 > ; < / span > < span class = cF2 > //REX< / span > < span class = cF0 >
< a name = "l195" > < / a > *dst++ = < / span > < span class = cFE > 0xF7< / span > < span class = cF0 > ; < / span > < span class = cF2 > //IDIV RBX< / span > < span class = cF0 >
< a name = "l196" > < / a > *dst++ = < / span > < span class = cFE > 0xFB< / span > < span class = cF0 > ;
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< a name = "l197" > < / a >
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< a name = "l198" > < / a > *dst++ = < / span > < span class = cFE > 0x50< / span > < span class = cF0 > ; < / span > < span class = cF2 > //PUSH RAX< / span > < span class = cF0 >
< a name = "l199" > < / a > *_dst = dst;
< a name = "l200" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_MUL< / span > < span class = cF0 > ;
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< a name = "l201" > < / a >
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< a name = "l202" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > OP_ADD:
< a name = "l203" > < / a > ParseTerm(_src, & dst, < / span > < span class = cF3 > PREC_ADD< / span > < span class = cF0 > );
< a name = "l204" > < / a > *dst++ = < / span > < span class = cFE > 0x5A< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RDX< / span > < span class = cF0 >
< a name = "l205" > < / a > *dst++ = < / span > < span class = cFE > 0x58< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RAX< / span > < span class = cF0 >
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< a name = "l206" > < / a >
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< a name = "l207" > < / a > *dst++ = < / span > < span class = cFE > 0x48< / span > < span class = cF0 > ; < / span > < span class = cF2 > //REX< / span > < span class = cF0 >
< a name = "l208" > < / a > *dst++ = < / span > < span class = cFE > 0x03< / span > < span class = cF0 > ; < / span > < span class = cF2 > //ADD RAX,RDX< / span > < span class = cF0 >
< a name = "l209" > < / a > *dst++ = < / span > < span class = cFE > 0xC2< / span > < span class = cF0 > ;
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< a name = "l210" > < / a >
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< a name = "l211" > < / a > *dst++ = < / span > < span class = cFE > 0x50< / span > < span class = cF0 > ; < / span > < span class = cF2 > //PUSH RAX< / span > < span class = cF0 >
< a name = "l212" > < / a > *_dst = dst;
< a name = "l213" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_ADD< / span > < span class = cF0 > ;
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< a name = "l214" > < / a >
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< a name = "l215" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > OP_SUB:
< a name = "l216" > < / a > ParseTerm(_src, & dst, < / span > < span class = cF3 > PREC_ADD< / span > < span class = cF0 > );
< a name = "l217" > < / a > *dst++ = < / span > < span class = cFE > 0x5A< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RDX< / span > < span class = cF0 >
< a name = "l218" > < / a > *dst++ = < / span > < span class = cFE > 0x58< / span > < span class = cF0 > ; < / span > < span class = cF2 > //POP RAX< / span > < span class = cF0 >
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< a name = "l219" > < / a >
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< a name = "l220" > < / a > *dst++ = < / span > < span class = cFE > 0x48< / span > < span class = cF0 > ; < / span > < span class = cF2 > //REX< / span > < span class = cF0 >
< a name = "l221" > < / a > *dst++ = < / span > < span class = cFE > 0x2B< / span > < span class = cF0 > ; < / span > < span class = cF2 > //SUB RAX,RDX< / span > < span class = cF0 >
< a name = "l222" > < / a > *dst++ = < / span > < span class = cFE > 0xC2< / span > < span class = cF0 > ;
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< a name = "l223" > < / a >
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< a name = "l224" > < / a > *dst++ = < / span > < span class = cFE > 0x50< / span > < span class = cF0 > ; < / span > < span class = cF2 > //PUSH RAX< / span > < span class = cF0 >
< a name = "l225" > < / a > *_dst = dst;
< a name = "l226" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > PREC_ADD< / span > < span class = cF0 > ;
< a name = "l227" > < / a > }
< a name = "l228" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
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< a name = "l229" > < / a > }
< a name = "l230" > < / a >
< a name = "l231" > < / a > < / span > < span class = cF1 > U0< / span > < span class = cF0 > Main()
< a name = "l232" > < / a > {
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< a name = "l233" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *src, *src2, *code, *dst;
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< a name = "l234" > < / a >
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< a name = "l235" > < / a > < / span > < span class = cF2 > //Fixed size, no buffer overrun check.< / span > < span class = cF0 >
< a name = "l236" > < / a > < / span > < span class = cF2 > //You can make it fancier if you like.< / span > < span class = cF0 >
< a name = "l237" > < / a > code = < / span > < span class = cF5 > MAlloc< / span > < span class = cF0 > (< / span > < span class = cFE > 512< / span > < span class = cF0 > , < / span > < span class = cF5 > Fs< / span > < span class = cF0 > -> code_heap);
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< a name = "l238" > < / a >
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< a name = "l239" > < / a > < / span > < span class = cF1 > while< / span > < span class = cF0 > (< / span > < span class = cF3 > TRUE< / span > < span class = cF0 > )
< a name = "l240" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l241" > < / a > < / span > < span class = cF6 > " This will compile an expression\n" < / span > < span class = cF0 >
< a name = "l242" > < / a > < / span > < span class = cF6 > " consisting of ints, parentheses\n" < / span > < span class = cF0 >
< a name = "l243" > < / a > < / span > < span class = cF6 > " and the operators +,-,* and /.\n" < / span > < span class = cF0 > ;
< a name = "l244" > < / a > src = < / span > < span class = cF5 > StrGet< / span > < span class = cF0 > ;
< a name = "l245" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (*src)
< a name = "l246" > < / a > {
< a name = "l247" > < / a > src2 = src;
< a name = "l248" > < / a > dst = code;
< a name = "l249" > < / a > < / span > < span class = cF1 > try< / span > < span class = cF0 >
< a name = "l250" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l251" > < / a > ParseTerm(& src2, & dst, PREC_PAREN);
< a name = "l252" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (Parse< / span > < span class = cF7 > (< / span > < span class = cF0 > & src2, & dst< / span > < span class = cF7 > )< / span > < span class = cF0 > != PREC_EOF)
< a name = "l253" > < / a > < / span > < span class = cF5 > throw< / span > < span class = cF0 > ;
< a name = "l254" > < / a > < / span > < span class = cF6 > " $RED$This code is not efficient, but the compiler is simple.$FG$\n" < / span > < span class = cF0 > ;
< a name = "l255" > < / a > < / span > < span class = cF5 > Un< / span > < span class = cF0 > (code, dst - code); < / span > < span class = cF2 > //Unassemble the code we created.< / span > < span class = cF0 >
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< a name = "l256" > < / a > < / span > < span class = cF2 > //< / span > < a href = "https://tomawezome.github.io/ZealOS/Kernel/KernelB.HH.html#l32" > < span class = cF4 > Call< / span > < / a > < span class = cF2 > () is a function. See < / span > < a href = "https://tomawezome.github.io/ZealOS/Kernel/KUtils.CC.html#l165" > < span class = cF4 > _CALL< / span > < / a > < span class = cF2 > ::< / span > < span class = cF0 >
< a name = "l257" > < / a > < / span > < span class = cF2 > //See also < / span > < a href = "https://tomawezome.github.io/ZealOS/Kernel/KernelB.HH.html#l35" > < span class = cF4 > CallInd< / span > < / a > < span class = cF2 > (). See < / span > < a href = "https://tomawezome.github.io/ZealOS/Kernel/KUtils.CC.html#l415" > < span class = cF4 > _CALL_IND< / span > < / a > < span class = cF2 > ::< / span > < span class = cF0 >
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< a name = "l258" > < / a > < / span > < span class = cF6 > " $LTBLUE$Answer:%d$FG$\n" < / span > < span class = cF0 > , < / span > < span class = cF5 > Call< / span > < span class = cF0 > (code);
< a name = "l259" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l260" > < / a > < / span > < span class = cF1 > catch< / span > < span class = cF0 >
< a name = "l261" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l262" > < / a > < / span > < span class = cF6 > " $RED$Error$FG$\n" < / span > < span class = cF0 > ;
< a name = "l263" > < / a > < / span > < span class = cF5 > PutExcept< / span > < span class = cF0 > ;
< a name = "l264" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l265" > < / a > < / span > < span class = cF5 > Free< / span > < span class = cF0 > (src);
< a name = "l266" > < / a > }
< a name = "l267" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l268" > < / a > {
< a name = "l269" > < / a > < / span > < span class = cF5 > Free< / span > < span class = cF0 > (src);
< a name = "l270" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l271" > < / a > }
< a name = "l272" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l273" > < / a > < / span > < span class = cF5 > Free< / span > < span class = cF0 > (code);
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< a name = "l274" > < / a > }
< a name = "l275" > < / a >
< a name = "l276" > < / a > Main;
< a name = "l277" > < / a >
< / span > < / pre > < / body >
< / html >
