llvm-project/clang/test/Modules/Inputs/macros_top.h

#define TOP unsigned int

#define TOP_LEFT_UNDEF 1


#define TOP_RIGHT_REDEF float
// The last definition will be exported from the sub-module.
#define TOP_RIGHT_REDEF int

#define TOP_RIGHT_UNDEF int

#define TOP_OTHER_UNDEF1 42
#undef TOP_OTHER_UNDEF2
#define TOP_OTHER_REDEF1 1
#define TOP_OTHER_REDEF2 2

#define TOP_OTHER_DEF_RIGHT_UNDEF void
Rework the (de-)serialization of macros, as stored in MacroInfo*. Instead of simply dumping an offset into the current file, give each macro definition a proper ID with all of the standard modules-remapping facilities. Additionally, when a macro is modified in a subsequent AST file (e.g., #undef'ing a macro loaded from another module or from a precompiled header), provide a macro update record rather than rewriting the entire macro definition. This gives us greater consistency with the way we handle declarations, and ties together macro definitions much more cleanly. Note that we're still not actually deserializing macro history (we never were), but it's far easy to do properly now. llvm-svn: 165560 2012-10-09 23:05:51 +00:00			`#define TOP unsigned int`

			`#define TOP_LEFT_UNDEF 1`

Diagnose the expansion of ambiguous macro definitions. This can happen only with modules, when two disjoint modules #define the same identifier to different token sequences. llvm-svn: 165746 2012-10-11 21:07:39 +00:00





[modules] If a submodule has re-definitions of the same macro, only the last definition will be used as the "exported" one. Fixes rdar://13562262 llvm-svn: 178622 2013-04-03 05:11:33 +00:00			`#define TOP_RIGHT_REDEF float`
			`// The last definition will be exported from the sub-module.`
Rework the (de-)serialization of macros, as stored in MacroInfo*. Instead of simply dumping an offset into the current file, give each macro definition a proper ID with all of the standard modules-remapping facilities. Additionally, when a macro is modified in a subsequent AST file (e.g., #undef'ing a macro loaded from another module or from a precompiled header), provide a macro update record rather than rewriting the entire macro definition. This gives us greater consistency with the way we handle declarations, and ties together macro definitions much more cleanly. Note that we're still not actually deserializing macro history (we never were), but it's far easy to do properly now. llvm-svn: 165560 2012-10-09 23:05:51 +00:00			`#define TOP_RIGHT_REDEF int`
Track which particular submodule #undef's a macro, so that the actual #undef only occurs if that submodule is imported. llvm-svn: 165773 2012-10-12 00:16:50 +00:00
			`#define TOP_RIGHT_UNDEF int`

If a module A exports a macro M, and a module B imports that macro and #undef's it, importers of B should not see the macro. This is complicated by the fact that A's macro could also be visible through a different path. The rules (as hashed out on cfe-commits) are included as a documentation update in this change. With this, the number of regressions in libc++'s testsuite when modules are enabled drops from 47 to 7. Those remaining 7 are also macro-related, and are due to remaining bugs in this change (in particular, the handling of submodules is imperfect). llvm-svn: 202560 2014-03-01 00:08:04 +00:00			`#define TOP_OTHER_UNDEF1 42`
			`#undef TOP_OTHER_UNDEF2`
			`#define TOP_OTHER_REDEF1 1`
			`#define TOP_OTHER_REDEF2 2`

			`#define TOP_OTHER_DEF_RIGHT_UNDEF void`