c++ g++ llvm-clang 编译器分析

2022-01-23 00:00:00 g++ clang c++

请注意，我的问题不是:我如何告诉我的编译器在开启分析的情况下进行编译.

Note, my question is not: how do I tell my compiler to compile with profiling on.

我想配置我的编译过程.对于每个文件，我想知道程序的每一行花费了多少时间.

I want to profile my compiles process. For each file, I'd like to know how much time is spent on each line of the program.

我正在处理一个项目，有些文件的编译时间很长，我正在尝试找出原因.

I'm working on a project, some files have huge compile times, I'm trying to figure out why.

有没有办法用 g++ 或 llvm-clang 做到这一点?

Is there anyway to do this with g++ or llvm-clang?

谢谢！

-v -ftime-report 的输出(什么意思)?

Output of -v -ftime-report (what oes it mean)?

下面是解析器"还是扩展"模板的使用?

In the following, is "parser" or "expand" the use of templates?

Execution times (seconds) callgraph construction: 0.06 ( 2%) usr 0.00 ( 0%) sys 0.09 ( 2%) wall 3181 kB ( 1%) ggc callgraph optimization: 0.05 ( 2%) usr 0.00 ( 0%) sys 0.05 ( 1%) wall 5243 kB ( 2%) ggc cfg cleanup : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 11 kB ( 0%) ggc df live regs : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 0.03 ( 1%) usr 0.00 ( 0%) sys 0.03 ( 1%) wall 1993 kB ( 1%) ggc register information : 0.04 ( 1%) usr 0.00 ( 0%) sys 0.04 ( 1%) wall 0 kB ( 0%) ggc alias analysis : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 450 kB ( 0%) ggc rebuild jump labels : 0.03 ( 1%) usr 0.00 ( 0%) sys 0.03 ( 1%) wall 0 kB ( 0%) ggc preprocessing : 0.12 ( 4%) usr 0.06 (12%) sys 1.46 (27%) wall 2752 kB ( 1%) ggc parser : 0.67 (21%) usr 0.15 (29%) sys 0.89 (16%) wall 91749 kB (36%) ggc name lookup : 0.15 ( 5%) usr 0.12 (24%) sys 0.24 ( 4%) wall 14384 kB ( 6%) ggc inline heuristics : 0.03 ( 1%) usr 0.00 ( 0%) sys 0.03 ( 1%) wall 0 kB ( 0%) ggc tree gimplify : 0.06 ( 2%) usr 0.01 ( 2%) sys 0.09 ( 2%) wall 15992 kB ( 6%) ggc tree eh : 0.02 ( 1%) usr 0.01 ( 2%) sys 0.03 ( 1%) wall 4405 kB ( 2%) ggc tree CFG construction : 0.01 ( 0%) usr 0.01 ( 2%) sys 0.03 ( 1%) wall 6636 kB ( 3%) ggc tree CFG cleanup : 0.02 ( 1%) usr 0.01 ( 2%) sys 0.02 ( 0%) wall 15 kB ( 0%) ggc tree find ref. vars : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 1870 kB ( 1%) ggc tree SSA rewrite : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 2357 kB ( 1%) ggc tree SSA other : 0.00 ( 0%) usr 0.01 ( 2%) sys 0.00 ( 0%) wall 37 kB ( 0%) ggc tree operand scan : 0.01 ( 0%) usr 0.04 ( 8%) sys 0.06 ( 1%) wall 6340 kB ( 2%) ggc tree SSA to normal : 0.05 ( 2%) usr 0.00 ( 0%) sys 0.05 ( 1%) wall 95 kB ( 0%) ggc dominance computation : 0.04 ( 1%) usr 0.00 ( 0%) sys 0.04 ( 1%) wall 0 kB ( 0%) ggc expand : 0.60 (18%) usr 0.03 ( 6%) sys 0.71 (13%) wall 45557 kB (18%) ggc varconst : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 3532 kB ( 1%) ggc jump : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 1745 kB ( 1%) ggc mode switching : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc integrated RA : 0.35 (11%) usr 0.00 ( 0%) sys 0.35 ( 6%) wall 5259 kB ( 2%) ggc reload : 0.29 ( 9%) usr 0.01 ( 2%) sys 0.31 ( 6%) wall 6490 kB ( 3%) ggc thread pro- & epilogue: 0.10 ( 3%) usr 0.01 ( 2%) sys 0.13 ( 2%) wall 4832 kB ( 2%) ggc final : 0.19 ( 6%) usr 0.01 ( 2%) sys 0.21 ( 4%) wall 2985 kB ( 1%) ggc symout : 0.25 ( 8%) usr 0.01 ( 2%) sys 0.26 ( 5%) wall 27322 kB (11%) ggc TOTAL : 3.25 0.51 5.49 256741 kB

推荐答案

用 g++ 试试这些命令行选项

Try these command line options with g++

-v -ftime-报告

-v -ftime-report

这应该会为您提供有关编译过程的更多信息.罪魁祸首通常是模板.

That should give you more information on the compiling process. The culprit is usually templates though.

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