llvm-6502/include/llvm-c
Duncan P. N. Exon Smith 4f897091e4 libLTO: Allow linker to choose context of modules and codegen
Add API for specifying which `LLVMContext` each `lto_module_t` and
`lto_code_gen_t` is in.

In particular, this enables the following flow:

    for (auto &File : Files) {
      lto_module_t M = lto_module_create_in_local_context(File...);
      querySymbols(M);
      lto_module_dispose(M);
    }

    lto_code_gen_t CG = lto_codegen_create_in_local_context();
    for (auto &File : FilesToLink) {
      lto_module_t M = lto_module_create_in_codegen_context(File..., CG);
      lto_codegen_add_module(CG, M);
      lto_module_dispose(M);
    }
    lto_codegen_compile(CG);
    lto_codegen_write_merged_modules(CG, ...);
    lto_codegen_dispose(CG);

This flow has a few benefits.

  - Only one module (two if you count the combined module in the code
    generator) is in memory at a time.

  - Metadata (and constants) from files that are parsed to query symbols
    but not linked into the code generator don't pollute the global
    context.

  - The first for loop can be parallelized, since each module is in its
    own context.

  - When the code generator is disposed, the memory from LTO gets freed.

rdar://problem/18767512

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221733 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-11 23:19:23 +00:00
..
Transforms [C API] Make the 'lower switch' pass available via the C API. 2014-09-11 21:32:32 +00:00
Analysis.h
BitReader.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
BitWriter.h Introduce LLVMWriteBitcodeToMemoryBuffer C API function. 2014-10-14 00:30:59 +00:00
Core.h [C API] PR19859: Add functions to query and modify branches. 2014-10-28 19:46:56 +00:00
Disassembler.h Extend C disassembler API to allow specifying target features 2014-09-30 16:31:40 +00:00
ExecutionEngine.h Reinstate "Nuke the old JIT." 2014-09-02 22:28:02 +00:00
Initialization.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
IRReader.h
Linker.h
LinkTimeOptimizer.h
lto.h libLTO: Allow linker to choose context of modules and codegen 2014-11-11 23:19:23 +00:00
module.modulemap [modules] The LLVM C API does not require C++! 2014-06-12 22:09:39 +00:00
Object.h Convert getFileOffset to getOffset and move it to its only user. 2014-04-21 13:45:32 +00:00
Support.h Introduce LLVMParseCommandLineOptions C API function. 2014-10-16 22:47:52 +00:00
Target.h
TargetMachine.h