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    out_string(lvl == level - 1 ? last ? sym->last_2 : sym->branch_2 : 
                       more[lvl + 1] ? sym->vert_2 : sym->empty_2);

条件表达式执行顺利：

    lvl == level - 1 ? last ? sym->last_2 : sym->branch_2 : more[lvl + 1] ? sym->vert_2 : sym->empty_2
= (lvl == level - 1) ? (last ? sym->last_2 : sym->branch_2) : (more[lvl + 1] ? sym->vert_2 : sym->empty_2)

反编译汇编代码：

  403eb0:	f94022c2 	ldr	x2, [x22, #64]              // x2=[0x43c288+64]=[0x43c2c8]=0x43c308=sym403eb4:	6b17039f 	cmp	w28, w23                    // w23=lvl ?= level-1403eb8:	54002840 	b.eq	4043c0 <ferror@plt+0x24e0>  // b.noneif (lvl == level-1) {// b.eq 4043c0last ? sym->last_2 : sym->branch_2// b 403ed8}else if (lvl != level-1) {403ebc:	f94016a1 	ldr	x1, [x21, #40]      // x21=0x43c870, x1=0x‭43c898‬=more403ec0:	91004040 	add	x0, x2, #0x10       // x0=sym->vert_2403ec4:	8b190021 	add	x1, x1, x25         // x1=more=more+(0,4,8...) -> more[lvl]403ec8:	b9400421 	ldr	w1, [x1, #4]        // more[lvl+1] -> more+4+4403ecc:	7100003f 	cmp	w1, #0x0            // more[lvl+1] ?= 0403ed0:	9a821000 	csel	x0, x0, x2, ne  // if (more[lvl+1]) x2=sym->vert_2; else x2=sym->empty_2403ed4:	f940001a 	ldr	x26, [x0]more[lvl + 1] ? sym->vert_2 : sym->empty_2}403ed8:	39400340 	ldrb	w0, [x26]       // if (lvl == level-1), w0=sym->last_2||sym->branch_2; if (lvl != level-1), w0=sym->vert_2||sym->empty_2403edc:	34000080 	cbz	w0, 403eec <ferror@plt+0x200c>if (w0 != NULL) {403ee0:	97fffd24 	bl	403370 <ferror@plt+0x1490>  // out_char(char c)403ee4:	38401f40 	ldrb	w0, [x26, #1]!          // w0++403ee8:	35ffffc0 	cbnz	w0, 403ee0 <ferror@plt+0x2000>out_char();}out_string(lvl == level - 1 ? last ? sym->last_2 : sym->branch_2 : more[lvl + 1] ? sym->vert_2 : sym->empty_2);4043c0:	b94063e0 	ldr	w0, [sp, #96]                   // w0=last4043c4:	34000060 	cbz	w0, 4043d0 <ferror@plt+0x24f0>if (last == 0) {// cbz 4043d0x26 = sym->branch_2;}else {4043c8:	f9400c5a 	ldr	x26, [x2, #24]                  // x26=sym+24=sym->last_24043cc:	17fffec3 	b	403ed8 <ferror@plt+0x1ff8>x26 = sym->last_2;}4043d0:	f940045a 	ldr	x26, [x2, #8]                   // x26=sym+8=sym->branch_24043d4:	17fffec1 	b	403ed8 <ferror@plt+0x1ff8>last ? sym->last_2 : sym->branch_2