first commit of new LTO system. It is not hooked up in the llvm/tools/Makefile, so no one will build it be default yet

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47621 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 240 insertions, 0 deletions

diff --git a/tools/lto2/lto.cpp b/tools/lto2/lto.cpp
new file mode 100644
index 0000000..d6f1d98
--- /dev/null
+++ b/tools/lto2/lto.cpp
@@ -0,0 +1,240 @@
+//===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Link Time Optimization library. This library is 
+// intended to be used by linker to optimize code at link time.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/lto.h"
+
+#include "LTOModule.h"
+#include "LTOCodeGenerator.h"
+
+
+// holds most recent error string
+// *** not thread safe ***
+static std::string sLastErrorString;
+
+
+
+//
+// returns a printable string
+//
+extern const char* lto_get_version()
+{
+    return LTOCodeGenerator::getVersionString();
+}
+
+//
+// returns the last error string or NULL if last operation was sucessful
+//
+const char* lto_get_error_message()
+{
+    return sLastErrorString.c_str();
+}
+
+
+
+//
+// validates if a file is a loadable object file
+//
+bool lto_module_is_object_file(const char* path)
+{
+    return LTOModule::isBitcodeFile(path);
+}
+
+
+//
+// validates if a file is a loadable object file compilable for requested target
+//
+bool lto_module_is_object_file_for_target(const char* path, 
+                                            const char* target_triplet_prefix)
+{
+    return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix);
+}
+
+
+//
+// validates if a buffer is a loadable object file
+//
+bool lto_module_is_object_file_in_memory(const void* mem, size_t length)
+{
+    return LTOModule::isBitcodeFile(mem, length);
+}
+
+
+//
+// validates if a buffer is a loadable object file compilable for the target
+//
+bool lto_module_is_object_file_in_memory_for_target(const void* mem, 
+                            size_t length, const char* target_triplet_prefix)
+{
+    return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix);
+}
+
+
+
+//
+// loads an object file from disk  
+// returns NULL on error (check lto_get_error_message() for details)
+//
+lto_module_t lto_module_create(const char* path)
+{
+     return LTOModule::makeLTOModule(path, sLastErrorString);
+}
+
+
+//
+// loads an object file from memory 
+// returns NULL on error (check lto_get_error_message() for details)
+//
+lto_module_t lto_module_create_from_memory(const void* mem, size_t length)
+{
+     return LTOModule::makeLTOModule(mem, length, sLastErrorString);
+}
+
+
+//
+// frees all memory for a module
+// upon return the lto_module_t is no longer valid
+//
+void lto_module_dispose(lto_module_t mod)
+{
+    delete mod;
+}
+
+
+//
+// returns triplet string which the object module was compiled under
+//
+const char* lto_module_get_target_triple(lto_module_t mod)
+{
+    return mod->getTargetTriple();
+}
+
+
+//
+// returns the number of symbols in the object module
+//
+uint32_t lto_module_get_num_symbols(lto_module_t mod)
+{
+    return mod->getSymbolCount();
+}
+
+//
+// returns the name of the ith symbol in the object module
+//
+const char* lto_module_get_symbol_name(lto_module_t mod, uint32_t index)
+{
+    return mod->getSymbolName(index);
+}
+
+
+//
+// returns the attributes of the ith symbol in the object module
+//
+lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 
+                                                            uint32_t index)
+{
+    return mod->getSymbolAttributes(index);
+}
+
+
+
+
+
+//
+// instantiates a code generator
+// returns NULL if there is an error
+//
+lto_code_gen_t lto_codegen_create()
+{
+     return new LTOCodeGenerator();
+}
+
+
+
+//
+// frees all memory for a code generator
+// upon return the lto_code_gen_t is no longer valid
+//
+void lto_codegen_dispose(lto_code_gen_t cg)
+{
+    delete cg;
+}
+
+
+
+//
+// add an object module to the set of modules for which code will be generated
+// returns true on error (check lto_get_error_message() for details)
+//
+bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod)
+{
+    return cg->addModule(mod, sLastErrorString);
+}
+
+
+//
+// sets what if any format of debug info should be generated
+// returns true on error (check lto_get_error_message() for details)
+//
+bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug)
+{
+    return cg->setDebugInfo(debug, sLastErrorString);
+}
+
+
+//
+// sets what code model to generated
+// returns true on error (check lto_get_error_message() for details)
+//
+bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model)
+{
+    return cg->setCodePICModel(model, sLastErrorString);
+}
+
+//
+// adds to a list of all global symbols that must exist in the final
+// generated code.  If a function is not listed there, it might be
+// inlined into every usage and optimized away.
+//
+void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol)
+{
+    cg->addMustPreserveSymbol(symbol);
+}
+
+
+//
+// writes a new file at the specified path that contains the
+// merged contents of all modules added so far.
+// returns true on error (check lto_get_error_message() for details)
+//
+bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path)
+{
+   return cg->writeMergedModules(path, sLastErrorString);
+}
+
+
+//
+// generates code for all added modules into one object file
+// On sucess returns a pointer to a generated mach-o buffer and
+// length set to the buffer size.  Client must free() the buffer
+// when done.
+// On failure, returns NULL (check lto_get_error_message() for details)
+//
+extern void*
+lto_codegen_compile(lto_code_gen_t cg, size_t* length)
+{
+    return cg->compile(length, sLastErrorString);
+}
+
+
+