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< pre style = " font-family:monospace;font-size:12pt " >
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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.html#l529 " > < span class = cF4 > Lex < / span > < / a > < span class = cF2 > ( ) , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/CMisc.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.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.html#l302 " > < span class = cF4 > ParseExpression < / span > < / a > < span class = cF2 > ( ) , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/ParseStatement.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.html#l26 " > < span class = cF4 > Intermediate Code Attributes < / span > < / a > < span class = cF2 > , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/OptPass012.html#l374 " > < span class = cF4 > Combining Consts < / span > < / a > < span class = cF2 > , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/OptPass3.html#l627 " > < span class = cF4 > Choosing Reg Vars < / span > < / a > < span class = cF2 > . Use < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/CMisc.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.html#l1797 " > < span class = cF4 > IC Struct < / span > < / a > < span class = cF2 > , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/ParseLib.html#l289 " > < span class = cF4 > COCCompile < / span > < / a > < span class = cF2 > and < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/OptPass789A.html#l596 " > < span class = cF4 > OptPass789A < / span > < / a > < span class = cF2 > ( ) , < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/BackA.html#l273 " > < span class = cF4 > BackEnd < / span > < / a > < span class = cF2 > . Set < / span > < a href = " https://tomawezome.github.io/ZealOS/Compiler/CMisc.html#l61 " > < span class = cF4 > Trace < / span > < / a > < span class = cF2 > ( ON ) to < / span > < span class = cF0 >
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< a name = " l12 " > < / a > < / span > < span class = cF2 > see the output of the backend . < / span > < span class = cF0 >
< 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 >
< a name = " l17 " > < / a > < / span > < span class = cF2 > * Putting a 0x48 , known as the REX byte , in front of an inst makes it 64 - bit size . < / span > < span class = cF0 >
< a name = " l18 " > < / a >
< a name = " l19 " > < / a > < / span > < span class = cF2 > * & quot ; PUSH EAX & quot ; , & quot ; POP EAX & quot ; and & quot ; XOR EAX , EAX & quot ; 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.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 > & lt ; = * src & lt ; = < / 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.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 ( & amp ; src2 , & amp ; dst2 ) ;
< a name = " l124 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( < / span > < span class = cF3 > PREC_MUL < / span > < span class = cF0 > & lt ; = i & lt ; 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.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.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 , & amp ; 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 , & amp ; 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 , & amp ; 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 , & amp ; 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 , & amp ; 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 > - & gt ; 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 > & quot ; This will compile an expression \ n & quot ; < / span > < span class = cF0 >
< a name = " l242 " > < / a > < / span > < span class = cF6 > & quot ; consisting of ints , parentheses \ n & quot ; < / span > < span class = cF0 >
< a name = " l243 " > < / a > < / span > < span class = cF6 > & quot ; and the operators + , - , * and / . \ n & quot ; < / 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 ( & amp ; src2 , & amp ; 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 > & amp ; src2 , & amp ; 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 > & quot ; $ RED $ This code is not efficient , but the compiler is simple . $ FG $ \ n & quot ; < / 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.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.html#l165"><span class=cF4>_CALL</span></a><span class=cF2>::</span><span class=cF0>
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< a name = " l257 " > < / a > < / span > < span class = cF2 > //See also </span><a href="https://tomawezome.github.io/ZealOS/Kernel/KernelB.html#l35"><span class=cF4>CallInd</span></a><span class=cF2>(). See </span><a href="https://tomawezome.github.io/ZealOS/Kernel/KUtils.html#l415"><span class=cF4>_CALL_IND</span></a><span class=cF2>::</span><span class=cF0>
< a name = " l258 " > < / a > < / span > < span class = cF6 > & quot ; $ LTBLUE $ Answer : % d $ FG $ \ n & quot ; < / 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 > & quot ; $ RED $ Error $ FG $ \ n & quot ; < / 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 >
