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[LTO][Legacy] Add new C inferface to query libcall functions

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Summary:
This is needed to implemented the same approach as lld (implemented in r338434)
for how to handling symbols that can be generated by LTO code generator
but not present in the symbol table for linker that uses legacy C APIs.

libLTO is in charge of providing the list of symbols. Linker is in
charge of implementing the eager loading from static libraries using
the list of symbols.

rdar://problem/52853974

Reviewers: tejohnson, bd1976llvm, deadalnix, espindola

Reviewed By: tejohnson

Subscribers: emaste, arichardson, hiraditya, MaskRay, dang, kledzik, mehdi_amini, inglorion, jkorous, dexonsmith, ributzka, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67568

llvm-svn: 372021
This commit is contained in:
Steven Wu 2019-09-16 18:49:54 +00:00
parent f30ad55559
commit 7fb3882581
5 changed files with 30 additions and 1 deletions
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10
include/llvm-c/lto.h
View File

@ -44,7 +44,7 @@ typedef bool lto_bool_t;
* @{
*/
#define LTO_API_VERSION 24
#define LTO_API_VERSION 25
/**
* \since prior to LTO_API_VERSION=3
@ -592,6 +592,14 @@ extern const char * lto_input_get_dependent_library(lto_input_t input,
size_t index,
size_t *size);
/**
* Returns the list of libcall symbols that can be generated by LTO
* that might not be visible from the symbol table of bitcode files.
*
* \since prior to LTO_API_VERSION=25
*/
extern const char *const *lto_runtime_lib_symbols_list(size_t *size);
/**
* @} // endgoup LLVMCLTO
* @defgroup LLVMCTLTO ThinLTO

4
include/llvm/LTO/LTO.h
View File

@ -298,6 +298,10 @@ public:
/// Cache) for each task identifier.
Error run(AddStreamFn AddStream, NativeObjectCache Cache = nullptr);
/// Static method that returns a list of libcall symbols that can be generated
/// by LTO but might not be visible from bitcode symbol table.
static ArrayRef<const char*> getRuntimeLibcallSymbols();
private:
Config Conf;

10
lib/LTO/LTO.cpp
View File

@ -1011,6 +1011,16 @@ Error LTO::runRegularLTO(AddStreamFn AddStream) {
std::move(RegularLTO.CombinedModule), ThinLTO.CombinedIndex);
}
static const char *libcallRoutineNames[] = {
#define HANDLE_LIBCALL(code, name) name,
#include "llvm/IR/RuntimeLibcalls.def"
#undef HANDLE_LIBCALL
};
ArrayRef<const char*> LTO::getRuntimeLibcallSymbols() {
return makeArrayRef(libcallRoutineNames);
}
/// This class defines the interface to the ThinLTO backend.
class lto::ThinBackendProc {
protected:

6
tools/lto/lto.cpp
View File

@ -652,3 +652,9 @@ extern const char *lto_input_get_dependent_library(lto_input_t input,
size_t *size) {
return LTOModule::getDependentLibrary(unwrap(input), index, size);
}
extern const char *const *lto_runtime_lib_symbols_list(size_t *size) {
auto symbols = lto::LTO::getRuntimeLibcallSymbols();
*size = symbols.size();
return symbols.data();
}

1
tools/lto/lto.exports
View File

@ -76,3 +76,4 @@ lto_input_create
lto_input_dispose
lto_input_get_num_dependent_libraries
lto_input_get_dependent_library
lto_runtime_lib_symbols_list