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前言

记录做项目的时候编译问题，好记性不如烂笔头，下次碰到相同的问题也可以方便查阅

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2023.3.22

问题1：每次跑回归测试的时候，总是会出现错误，总共只有5个test，单独跑这个case的时候是没有问题的

An unexpected termination has occurred in ./SIMV/ahbl_mst_burst_apb_slv_slverr_051555011_simv due to a signal: Segmentation fault

问题分析： 发生了段错误，没有物理内存对应该地址，好像是访问了一些不存在的物理内存空间，在出现这个错误之前，还出现下面的warning信息。但是我在仿真脚本的编译选项里面是添加了这个+ntb_solver_array_size_warn=10000，可能是没起作用，导致数组长度太大。

Warning-[CNST-LASW] Constraint large array size warning
/home/xxx/ahb2apb/dv/seqlib/ahbl_mst_seqlib.sv, 30Variable haddr_q.size() has value > 100000, which may cause severe  performance degradation.Please try to reduce the array size.You can use +ntb_solver_array_size_warn=<num> to adjust the array size warning limit.

Warning-[UNK_COMP_ARG] Unknown compile time plus argument usedUnknown compile time plus argument 'ntb_solver_array_size_warn=100000' is ignored.

解决方法：
把它设置成了200000，还是有warning信息

Warning - [CNST-LASW] Constraint large array size warning/home/heliu/ahb2apb/dv / seqlib/ahbl_mst_seqlib.sv,30
Variable haddr q.size( ) has value > 1410065408,which may cause severe performance degradation.Please try to reduce the array size.
You can use +ntb_solver_array_size_warn=<num> to adjust the array sizewarning limit.

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问题2 ：为了避免对case语句中default语句收集覆盖率，所以添加了编译选项-cm_nocasedef，出现如下warning

Warning-[VCM-OPTINWP] Option used in wrong phase.-cm_nocasedef is not a compile-time coverage option. It will have no effect at compile-time.This option should be used at report-time.Please contact VCS support forfurther information.

解决方法：区分compile-time、run-time、report-time这三个不同的时间，看上去像是选项加错了位置，而且总感觉出现这些问题都是我要一步执行-R引起的，但是又说一步执行的vcs选项的顺序又没有太大的要求，这点暂时还没理解清楚

改成了-cm_cond nocasedef，又出现了下面这个错误，-cm_cond没有nocasedef这个选项，有的选项在另外一篇博客有介绍

Error-[CM-ARGPL] Incorrect argument 'nocasedef' is not a valid argument to -cm_cond. The -cm_cond option requires a '+' separated list of flags. The legal flags are: basic std allops full event anywidth tf caseeq for path sop ports allvectors scalarbitwise flat obs noxfalse objects

最后在urg的时候加上去除收集default语句的行覆盖率：-line nocasedef

urg -full64 -line nocasedef -dir *.vdb -dbname merge -report urgReport

输出的urg log信息中有如下：

Note-[URG-NCDN] No case defaultSince the -line nocasedef option was given, URG will exclude all the "default" case items from the line coverage reports.

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