Change Details

Add a new hidden option -print-changes that reports in a patch-like notation when a pass actually changes the IR. A new hidden option -print-changes is introduced that reports when a pass changes the IR and only prints a banner when no change is made by a pass or when the pass or function is filtered out. The changes are shown in a form similar to a dump of a function except that the text which is removed is shown prefixed with a '-' and the text which is added is shown with a '+' in front. Filtering of the output can be controlled with the -filter-print-funcs and -filter-passes options. The template base classes for these change reporters is moved into separate files and the base classes are expanded to allow more complex methods of reporting changes. The base classes handle all of the determination of when a function or pass is "interesting" and should be reported or filtered out. The base classes have pure virtual functions which are called when a change by a pass has been recognized so the derived class need only provide the overrides to present the information about the changing IR. The new option -print-changes is the first of these instantiations using these base classes. A second instantiation is still to come in a subsequent commit.

[NFC intended] Refactor the code for printChanged for reuse and to facilitate subsequent reporters of changes to the IR in the new pass manager. Create abstract template base classes for common functionality and give classes more appropriate names. The base classes handle all of the determination of when a function or pass is "interesting" and should be reported or filtered out. They have pure virtual functions which are called when a change by a pass has been recognized so the derived class need only provide the overrides to present the information about the changing IR. There are at least 2 more change reporters to come (which were presented in my tutorial at the 2020 llvm developer's meeting) that derive from these classes.

Add a new hidden option - [NFC intended] Refactor the code for print-cChanges that reports in a patch-like notationd for reuse and to facilitate when a pass actually subsequent reporters of changes to the IR in the new pass manager. A new hidden option -print-changes is introduced that reports when Create abstract template base classes for common functionality and give a pass changes the IR and only prints a banner when no change is made by a pass or when the pass or function is filtered out. The changes are shown in a form similar to a dump of a function except that the text which is removed is shown prefixed with a '-' and the text which is added is shown with a '+' in front. Filtering of the output can be controlled with the -filter-print-funcs and -filter-passes options. The template base classes for these change reporters is moved into separate files and the base classes are expanded to allow more complex methods of reporting chang classes more appropriate names. The base classes handle all of the determination of when a function or pass is "interesting" and should be reported or filtered out. The base classesThey have pure virtual functions which are called which are called when a change by a pass has been recognized so the derived class need only derived class need only provide the overrides to present the information about the changing IR. about the changing IR. The new option -print-changes is the first of these There are at least 2 more change reporters to come (which were presented instantiations using in my tutorial at these base classes. A second instantiation 2020 llvm developer's meeting) that derive from is still to come in a subsequent commit these classes.