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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2013-10-03 18:29:09 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2013-10-03 18:29:09 +0000 |
| commit | 438900938c3ac9d7fac2dd5d2c85ca4b9b2e35f7 (patch) | |
| tree | ee292d94cfa7c8661cc4cd598f32e66289df9aeb /include/llvm-c/lto.h | |
| parent | 1df59ef1aa271a4e33cf8973e14bcaf55c585231 (diff) | |
| download | llvm-438900938c3ac9d7fac2dd5d2c85ca4b9b2e35f7.tar.gz llvm-438900938c3ac9d7fac2dd5d2c85ca4b9b2e35f7.tar.bz2 llvm-438900938c3ac9d7fac2dd5d2c85ca4b9b2e35f7.tar.xz | |
Optimize linkonce_odr unnamed_addr functions during LTO.
Generalize the API so we can distinguish symbols that are needed just for a DSO
symbol table from those that are used from some native .o.
The symbols that are only wanted for the dso symbol table can be dropped if
llvm can prove every other dso has a copy (linkonce_odr) and the address is not
important (unnamed_addr).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191922 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm-c/lto.h')
| -rw-r--r-- | include/llvm-c/lto.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h index 58d58336b5..85d5439ec9 100644 --- a/include/llvm-c/lto.h +++ b/include/llvm-c/lto.h @@ -29,7 +29,7 @@ * @{ */ -#define LTO_API_VERSION 4 +#define LTO_API_VERSION 5 typedef enum { LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F, /* log2 of alignment */ @@ -253,13 +253,21 @@ lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, int nargs); /** - * Adds to a list of all global symbols that must exist in the final - * generated code. If a function is not listed, it might be - * inlined into every usage and optimized away. + * Tells LTO optimization passes that this symbol must be preserved + * because it is referenced by native code or a command line option. */ extern void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol); + +/** + * Tells LTO optimization passes that a dynamic shared library is being + * built and this symbol may be exported. Unless IR semantics allow the symbol + * to be made local to the library, it should remain so it can be exported by + * the shared library. + */ +extern void lto_codegen_add_dso_symbol(lto_code_gen_t cg, const char *symbol); + /** * Writes a new object file at the specified path that contains the * merged contents of all modules added so far. |