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, 234 insertions, 0 deletions

diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
new file mode 100644
index 0000000000..8d4590b675
--- /dev/null
+++ b/include/llvm-c/lto.h
@@ -0,0 +1,234 @@
+/*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This header provides public interface to an abstract link time optimization*|
+|* library.  LLVM provides an implementation of this interface for use with   *|
+|* llvm bitcode files.                                                        *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#ifndef LTO_H
+#define LTO_H  1
+
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef enum {
+    LTO_SYMBOL_ALIGNMENT_MASK         = 0x0000001F,    /* log2 of alignment */
+    LTO_SYMBOL_PERMISSIONS_MASK       = 0x000000E0,    
+    LTO_SYMBOL_PERMISSIONS_CODE       = 0x000000A0,    
+    LTO_SYMBOL_PERMISSIONS_DATA       = 0x000000C0,    
+    LTO_SYMBOL_PERMISSIONS_RODATA     = 0x00000080,    
+    LTO_SYMBOL_DEFINITION_MASK        = 0x00000700,    
+    LTO_SYMBOL_DEFINITION_REGULAR     = 0x00000100,    
+    LTO_SYMBOL_DEFINITION_TENTATIVE   = 0x00000200,    
+    LTO_SYMBOL_DEFINITION_WEAK        = 0x00000300,    
+    LTO_SYMBOL_DEFINITION_UNDEFINED   = 0x00000400,    
+    LTO_SYMBOL_SCOPE_MASK             = 0x00001800,    
+    LTO_SYMBOL_SCOPE_INTERNAL         = 0x00000800,    
+    LTO_SYMBOL_SCOPE_HIDDEN           = 0x00001000,    
+    LTO_SYMBOL_SCOPE_DEFAULT          = 0x00001800    
+} lto_symbol_attributes;
+
+typedef enum {
+    LTO_DEBUG_MODEL_NONE         = 0,
+    LTO_DEBUG_MODEL_DWARF        = 1
+} lto_debug_model;
+
+typedef enum {
+    LTO_CODEGEN_PIC_MODEL_STATIC         = 0,
+    LTO_CODEGEN_PIC_MODEL_DYNAMIC        = 1,
+    LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2
+} lto_codegen_model;
+
+
+/** opaque reference to a loaded object module */
+typedef struct LTOModule*         lto_module_t;
+
+/** opaque reference to a code generator */
+typedef struct LTOCodeGenerator*  lto_code_gen_t;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Returns a printable string.
+ */
+extern const char*
+lto_get_version();
+
+
+/**
+ * Returns the last error string or NULL if last operation was sucessful.
+ */
+extern const char*
+lto_get_error_message();
+
+
+/**
+ * Checks if a file is a loadable object file.
+ */
+extern bool
+lto_module_is_object_file(const char* path);
+
+
+/**
+ * Checks if a file is a loadable object compiled for requested target.
+ */
+extern bool
+lto_module_is_object_file_for_target(const char* path, 
+                                            const char* target_triple_prefix);
+
+
+/**
+ * Checks if a buffer is a loadable object file.
+ */
+extern bool
+lto_module_is_object_file_in_memory(const void* mem, size_t length);
+
+
+/**
+ * Checks if a buffer is a loadable object compiled for requested target.
+ */
+extern bool
+lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length, 
+                                               const char* target_triple_prefix);
+
+
+/**
+ * Loads an object file from disk.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ */
+extern lto_module_t
+lto_module_create(const char* path);
+
+
+/**
+ * Loads an object file from memory.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ */
+extern lto_module_t
+lto_module_create_from_memory(const void* mem, size_t length);
+
+
+/**
+ * Frees all memory internally allocated by the module.
+ * Upon return the lto_module_t is no longer valid.
+ */
+extern void
+lto_module_dispose(lto_module_t mod);
+
+
+/**
+ * Returns triple string which the object module was compiled under.
+ */
+extern const char*
+lto_module_get_target_triple(lto_module_t mod);
+
+
+/**
+ * Returns the number of symbols in the object module.
+ */
+extern unsigned int
+lto_module_get_num_symbols(lto_module_t mod);
+
+
+/**
+ * Returns the name of the ith symbol in the object module.
+ */
+extern const char*
+lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
+
+
+/**
+ * Returns the attributes of the ith symbol in the object module.
+ */
+extern lto_symbol_attributes
+lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
+
+
+/**
+ * Instantiates a code generator.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ */
+extern lto_code_gen_t
+lto_codegen_create();
+
+
+/**
+ * Frees all code generator and all memory it internally allocated.
+ * Upon return the lto_code_gen_t is no longer valid.
+ */
+extern void
+lto_codegen_dispose(lto_code_gen_t);
+
+
+
+/**
+ * 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).
+ */
+extern bool
+lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod);
+
+
+
+/**
+ * Sets if debug info should be generated.
+ * Returns true on error (check lto_get_error_message() for details).
+ */
+extern bool
+lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model);
+
+
+/**
+ * Sets which PIC code model to generated.
+ * Returns true on error (check lto_get_error_message() for details).
+ */
+extern bool
+lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model);
+
+
+/**
+ * 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.
+ */
+extern void
+lto_codegen_add_must_preserve_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.
+ * Returns true on error (check lto_get_error_message() for details).
+ */
+extern bool
+lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path);
+
+
+/**
+ * Generates code for all added modules into one native object file.
+ * On sucess returns a pointer to a generated mach-o/ELF buffer and
+ * length set to the buffer size.  Client owns the buffer and should
+ * free() it 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);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif