[llvm] r211315 - Use lib/LTO directly in the gold plugin.
Nick Lewycky
nlewycky at google.com
Thu Jun 19 14:42:06 PDT 2014
On 19 June 2014 14:14, Rafael Espindola <rafael.espindola at gmail.com> wrote:
> Author: rafael
> Date: Thu Jun 19 16:14:13 2014
> New Revision: 211315
>
> URL: http://llvm.org/viewvc/llvm-project?rev=211315&view=rev
> Log:
> Use lib/LTO directly in the gold plugin.
>
> The tools/lto API is not the best choice for implementing a gold plugin.
> Among
> other issues:
>
> * It is an stable ABI. Old errors stay and we have to be really careful
> before adding new features.
> * It has to support two fairly different linkers: gold and ld64.
> * We end up with a plugin that depends on a shared lib, something quiet
> unusual in LLVM land.
> * It hides LLVM. For some features in the gold plugin it would be really
> nice to be able to just get a Module or a GlobalValue.
>
> This change is intended to be a very direct translation from the C API. It
> will just enable other fixes and cleanups.
>
Huh, okay. Cool. This came as a surprise to me but I guess it's the logical
progression now that liblto is split into lib/LTO and tools/LTO.
At this point I'll stop protecting (read: caring about) the tools/lto C API
since the only consumer is now Apple's LD?
Nick
Tested with a LTO bootstrap on linux.
>
> Modified:
> llvm/trunk/tools/gold/CMakeLists.txt
> llvm/trunk/tools/gold/gold-plugin.cpp
>
> Modified: llvm/trunk/tools/gold/CMakeLists.txt
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/gold/CMakeLists.txt?rev=211315&r1=211314&r2=211315&view=diff
>
> ==============================================================================
> --- llvm/trunk/tools/gold/CMakeLists.txt (original)
> +++ llvm/trunk/tools/gold/CMakeLists.txt Thu Jun 19 16:14:13 2014
> @@ -14,13 +14,14 @@ else()
> # ABI compatibility.
> add_definitions( -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 )
>
> - set(LLVM_LINK_COMPONENTS support)
> + set(LLVM_LINK_COMPONENTS
> + ${LLVM_TARGETS_TO_BUILD}
> + LTO
> + )
>
> add_llvm_loadable_module(LLVMgold
> gold-plugin.cpp
> )
>
> - target_link_libraries(LLVMgold ${cmake_2_8_12_PRIVATE} LTO)
> -
> endif()
>
>
> Modified: llvm/trunk/tools/gold/gold-plugin.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/gold/gold-plugin.cpp?rev=211315&r1=211314&r2=211315&view=diff
>
> ==============================================================================
> --- llvm/trunk/tools/gold/gold-plugin.cpp (original)
> +++ llvm/trunk/tools/gold/gold-plugin.cpp Thu Jun 19 16:14:13 2014
> @@ -15,11 +15,15 @@
> #include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
> #include "llvm-c/lto.h"
> #include "llvm/ADT/StringSet.h"
> +#include "llvm/CodeGen/CommandFlags.h"
> +#include "llvm/LTO/LTOCodeGenerator.h"
> +#include "llvm/LTO/LTOModule.h"
> #include "llvm/Support/Errno.h"
> #include "llvm/Support/FileSystem.h"
> #include "llvm/Support/MemoryBuffer.h"
> #include "llvm/Support/Path.h"
> #include "llvm/Support/Program.h"
> +#include "llvm/Support/TargetSelect.h"
> #include "llvm/Support/ToolOutputFile.h"
> #include <cerrno>
> #include <cstdlib>
> @@ -72,9 +76,10 @@ namespace {
> std::string output_name = "";
> std::list<claimed_file> Modules;
> std::vector<std::string> Cleanup;
> - lto_code_gen_t code_gen = NULL;
> + LTOCodeGenerator *CodeGen = nullptr;
> StringSet<> CannotBeHidden;
> }
> +static llvm::TargetOptions TargetOpts;
>
> namespace options {
> enum generate_bc { BC_NO, BC_ALSO, BC_ONLY };
> @@ -142,6 +147,7 @@ ld_plugin_status onload(ld_plugin_tv *tv
> // for services.
>
> bool registeredClaimFile = false;
> + bool RegisteredAllSymbolsRead = false;
>
> for (; tv->tv_tag != LDPT_NULL; ++tv) {
> switch (tv->tv_tag) {
> @@ -189,7 +195,7 @@ ld_plugin_status onload(ld_plugin_tv *tv
> if ((*callback)(all_symbols_read_hook) != LDPS_OK)
> return LDPS_ERR;
>
> - code_gen = lto_codegen_create();
> + RegisteredAllSymbolsRead = true;
> } break;
> case LDPT_REGISTER_CLEANUP_HOOK: {
> ld_plugin_register_cleanup callback;
> @@ -233,6 +239,28 @@ ld_plugin_status onload(ld_plugin_tv *tv
> return LDPS_ERR;
> }
>
> + if (RegisteredAllSymbolsRead) {
> + InitializeAllTargetInfos();
> + InitializeAllTargets();
> + InitializeAllTargetMCs();
> + InitializeAllAsmParsers();
> + InitializeAllAsmPrinters();
> + InitializeAllDisassemblers();
> + TargetOpts = InitTargetOptionsFromCodeGenFlags();
> + CodeGen = new LTOCodeGenerator();
> + CodeGen->setTargetOptions(TargetOpts);
> + if (MAttrs.size()) {
> + std::string Attrs;
> + for (unsigned I = 0; I < MAttrs.size(); ++I) {
> + if (I > 0)
> + Attrs.append(",");
> + Attrs.append(MAttrs[I]);
> + }
> +
> + CodeGen->setAttr(Attrs.c_str());
> + }
> + }
> +
> return LDPS_OK;
> }
>
> @@ -241,7 +269,7 @@ ld_plugin_status onload(ld_plugin_tv *tv
> /// with add_symbol if possible.
> static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
> int *claimed) {
> - lto_module_t M;
> + LTOModule *M;
> const void *view;
> std::unique_ptr<MemoryBuffer> buffer;
> if (get_view) {
> @@ -264,17 +292,15 @@ static ld_plugin_status claim_file_hook(
> view = buffer->getBufferStart();
> }
>
> - if (!lto_module_is_object_file_in_memory(view, file->filesize))
> + if (!LTOModule::isBitcodeFile(view, file->filesize))
> return LDPS_OK;
>
> - M = lto_module_create_from_memory(view, file->filesize);
> + std::string Error;
> + M = LTOModule::makeLTOModule(view, file->filesize, TargetOpts, Error);
> if (!M) {
> - if (const char* msg = lto_get_error_message()) {
> - (*message)(LDPL_ERROR,
> - "LLVM gold plugin has failed to create LTO module: %s",
> - msg);
> - return LDPS_ERR;
> - }
> + (*message)(LDPL_ERROR,
> + "LLVM gold plugin has failed to create LTO module: %s",
> + Error.c_str());
> return LDPS_OK;
> }
>
> @@ -283,20 +309,20 @@ static ld_plugin_status claim_file_hook(
> claimed_file &cf = Modules.back();
>
> if (!options::triple.empty())
> - lto_module_set_target_triple(M, options::triple.c_str());
> + M->setTargetTriple(options::triple.c_str());
>
> cf.handle = file->handle;
> - unsigned sym_count = lto_module_get_num_symbols(M);
> + unsigned sym_count = M->getSymbolCount();
> cf.syms.reserve(sym_count);
>
> for (unsigned i = 0; i != sym_count; ++i) {
> - lto_symbol_attributes attrs = lto_module_get_symbol_attribute(M, i);
> + lto_symbol_attributes attrs = M->getSymbolAttributes(i);
> if ((attrs & LTO_SYMBOL_SCOPE_MASK) == LTO_SYMBOL_SCOPE_INTERNAL)
> continue;
>
> cf.syms.push_back(ld_plugin_symbol());
> ld_plugin_symbol &sym = cf.syms.back();
> - sym.name = const_cast<char *>(lto_module_get_symbol_name(M, i));
> + sym.name = const_cast<char *>(M->getSymbolName(i));
> sym.name = strdup(sym.name);
> sym.version = NULL;
>
> @@ -359,15 +385,15 @@ static ld_plugin_status claim_file_hook(
> }
> }
>
> - if (code_gen) {
> - if (lto_codegen_add_module(code_gen, M)) {
> - (*message)(LDPL_ERROR, "Error linking module: %s",
> - lto_get_error_message());
> + if (CodeGen) {
> + std::string Error;
> + if (!CodeGen->addModule(M, Error)) {
> + (*message)(LDPL_ERROR, "Error linking module: %s", Error.c_str());
> return LDPS_ERR;
> }
> }
>
> - lto_module_dispose(M);
> + delete M;
>
> return LDPS_OK;
> }
> @@ -386,7 +412,7 @@ static bool mustPreserve(const claimed_f
> /// codegen.
> static ld_plugin_status all_symbols_read_hook(void) {
> std::ofstream api_file;
> - assert(code_gen);
> + assert(CodeGen);
>
> if (options::generate_api_file) {
> api_file.open("apifile.txt", std::ofstream::out |
> std::ofstream::trunc);
> @@ -403,7 +429,7 @@ static ld_plugin_status all_symbols_read
> (*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
> for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
> if (mustPreserve(*I, i)) {
> - lto_codegen_add_must_preserve_symbol(code_gen, I->syms[i].name);
> + CodeGen->addMustPreserveSymbol(I->syms[i].name);
>
> if (options::generate_api_file)
> api_file << I->syms[i].name << "\n";
> @@ -414,16 +440,16 @@ static ld_plugin_status all_symbols_read
> if (options::generate_api_file)
> api_file.close();
>
> - lto_codegen_set_pic_model(code_gen, output_type);
> - lto_codegen_set_debug_model(code_gen, LTO_DEBUG_MODEL_DWARF);
> + CodeGen->setCodePICModel(output_type);
> + CodeGen->setDebugInfo(LTO_DEBUG_MODEL_DWARF);
> if (!options::mcpu.empty())
> - lto_codegen_set_cpu(code_gen, options::mcpu.c_str());
> + CodeGen->setCpu(options::mcpu.c_str());
>
> // Pass through extra options to the code generator.
> if (!options::extra.empty()) {
> for (std::vector<std::string>::iterator it = options::extra.begin();
> it != options::extra.end(); ++it) {
> - lto_codegen_debug_options(code_gen, (*it).c_str());
> + CodeGen->setCodeGenDebugOptions((*it).c_str());
> }
> }
>
> @@ -435,11 +461,12 @@ static ld_plugin_status all_symbols_read
> path = options::bc_path;
> else
> path = output_name + ".bc";
> - bool err = lto_codegen_write_merged_modules(code_gen, path.c_str());
> - if (err)
> + CodeGen->parseCodeGenDebugOptions();
> + std::string Error;
> + if (!CodeGen->writeMergedModules(path.c_str(), Error))
> (*message)(LDPL_FATAL, "Failed to write the output file.");
> if (options::generate_bc_file == options::BC_ONLY) {
> - lto_codegen_dispose(code_gen);
> + delete CodeGen;
> exit(0);
> }
> }
> @@ -447,13 +474,15 @@ static ld_plugin_status all_symbols_read
> std::string ObjPath;
> {
> const char *Temp;
> - if (lto_codegen_compile_to_file(code_gen, &Temp)) {
> + CodeGen->parseCodeGenDebugOptions();
> + std::string Error;
> + if (!CodeGen->compile_to_file(&Temp, /*DisableOpt*/ false,
> /*DisableInline*/
> + false, /*DisableGVNLoadPRE*/ false,
> Error))
> (*message)(LDPL_ERROR, "Could not produce a combined object
> file\n");
> - }
> ObjPath = Temp;
> }
>
> - lto_codegen_dispose(code_gen);
> + delete CodeGen;
> for (std::list<claimed_file>::iterator I = Modules.begin(),
> E = Modules.end(); I != E; ++I) {
> for (unsigned i = 0; i != I->syms.size(); ++i) {
>
>
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