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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
860 lines
26 KiB
C
860 lines
26 KiB
C
/*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
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|* *|
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM *|
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|* Exceptions. *|
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|* See https://llvm.org/LICENSE.txt for license information. *|
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|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception *|
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|* *|
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|*===----------------------------------------------------------------------===*|
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|* *|
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|* This header provides public interface to an abstract link time optimization*|
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|* library. LLVM provides an implementation of this interface for use with *|
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|* llvm bitcode files. *|
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|* *|
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\*===----------------------------------------------------------------------===*/
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#ifndef LLVM_C_LTO_H
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#define LLVM_C_LTO_H
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#ifdef __cplusplus
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#include <cstddef>
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#else
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#include <stddef.h>
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#endif
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#include <sys/types.h>
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#ifndef __cplusplus
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#if !defined(_MSC_VER)
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#include <stdbool.h>
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typedef bool lto_bool_t;
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#else
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/* MSVC in particular does not have anything like _Bool or bool in C, but we can
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at least make sure the type is the same size. The implementation side will
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use C++ bool. */
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typedef unsigned char lto_bool_t;
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#endif
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#else
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typedef bool lto_bool_t;
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#endif
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/**
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* @defgroup LLVMCLTO LTO
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* @ingroup LLVMC
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*
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* @{
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*/
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#define LTO_API_VERSION 23
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/**
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* \since prior to LTO_API_VERSION=3
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*/
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typedef enum {
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LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F, /* log2 of alignment */
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LTO_SYMBOL_PERMISSIONS_MASK = 0x000000E0,
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LTO_SYMBOL_PERMISSIONS_CODE = 0x000000A0,
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LTO_SYMBOL_PERMISSIONS_DATA = 0x000000C0,
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LTO_SYMBOL_PERMISSIONS_RODATA = 0x00000080,
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LTO_SYMBOL_DEFINITION_MASK = 0x00000700,
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LTO_SYMBOL_DEFINITION_REGULAR = 0x00000100,
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LTO_SYMBOL_DEFINITION_TENTATIVE = 0x00000200,
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LTO_SYMBOL_DEFINITION_WEAK = 0x00000300,
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LTO_SYMBOL_DEFINITION_UNDEFINED = 0x00000400,
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LTO_SYMBOL_DEFINITION_WEAKUNDEF = 0x00000500,
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LTO_SYMBOL_SCOPE_MASK = 0x00003800,
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LTO_SYMBOL_SCOPE_INTERNAL = 0x00000800,
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LTO_SYMBOL_SCOPE_HIDDEN = 0x00001000,
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LTO_SYMBOL_SCOPE_PROTECTED = 0x00002000,
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LTO_SYMBOL_SCOPE_DEFAULT = 0x00001800,
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LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
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LTO_SYMBOL_COMDAT = 0x00004000,
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LTO_SYMBOL_ALIAS = 0x00008000
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} lto_symbol_attributes;
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/**
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* \since prior to LTO_API_VERSION=3
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*/
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typedef enum {
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LTO_DEBUG_MODEL_NONE = 0,
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LTO_DEBUG_MODEL_DWARF = 1
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} lto_debug_model;
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/**
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* \since prior to LTO_API_VERSION=3
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*/
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typedef enum {
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LTO_CODEGEN_PIC_MODEL_STATIC = 0,
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LTO_CODEGEN_PIC_MODEL_DYNAMIC = 1,
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LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2,
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LTO_CODEGEN_PIC_MODEL_DEFAULT = 3
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} lto_codegen_model;
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/** opaque reference to a loaded object module */
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typedef struct LLVMOpaqueLTOModule *lto_module_t;
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/** opaque reference to a code generator */
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typedef struct LLVMOpaqueLTOCodeGenerator *lto_code_gen_t;
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/** opaque reference to a thin code generator */
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typedef struct LLVMOpaqueThinLTOCodeGenerator *thinlto_code_gen_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Returns a printable string.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern const char*
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lto_get_version(void);
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/**
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* Returns the last error string or NULL if last operation was successful.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern const char*
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lto_get_error_message(void);
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/**
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* Checks if a file is a loadable object file.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_module_is_object_file(const char* path);
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/**
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* Checks if a file is a loadable object compiled for requested target.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_module_is_object_file_for_target(const char* path,
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const char* target_triple_prefix);
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/**
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* Return true if \p Buffer contains a bitcode file with ObjC code (category
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* or class) in it.
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*
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* \since LTO_API_VERSION=20
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*/
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extern lto_bool_t
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lto_module_has_objc_category(const void *mem, size_t length);
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/**
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* Checks if a buffer is a loadable object file.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t lto_module_is_object_file_in_memory(const void *mem,
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size_t length);
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/**
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* Checks if a buffer is a loadable object compiled for requested target.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length,
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const char* target_triple_prefix);
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/**
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* Loads an object file from disk.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_module_t
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lto_module_create(const char* path);
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/**
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* Loads an object file from memory.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_module_t
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lto_module_create_from_memory(const void* mem, size_t length);
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/**
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* Loads an object file from memory with an extra path argument.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=9
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*/
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extern lto_module_t
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lto_module_create_from_memory_with_path(const void* mem, size_t length,
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const char *path);
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/**
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* Loads an object file in its own context.
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*
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* Loads an object file in its own LLVMContext. This function call is
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* thread-safe. However, modules created this way should not be merged into an
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* lto_code_gen_t using \a lto_codegen_add_module().
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*
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=11
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*/
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extern lto_module_t
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lto_module_create_in_local_context(const void *mem, size_t length,
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const char *path);
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/**
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* Loads an object file in the codegen context.
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*
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* Loads an object file into the same context as \c cg. The module is safe to
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* add using \a lto_codegen_add_module().
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*
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=11
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*/
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extern lto_module_t
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lto_module_create_in_codegen_context(const void *mem, size_t length,
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const char *path, lto_code_gen_t cg);
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/**
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* Loads an object file from disk. The seek point of fd is not preserved.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=5
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*/
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extern lto_module_t
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lto_module_create_from_fd(int fd, const char *path, size_t file_size);
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/**
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* Loads an object file from disk. The seek point of fd is not preserved.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=5
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*/
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extern lto_module_t
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lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size,
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size_t map_size, off_t offset);
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/**
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* Frees all memory internally allocated by the module.
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* Upon return the lto_module_t is no longer valid.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern void
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lto_module_dispose(lto_module_t mod);
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/**
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* Returns triple string which the object module was compiled under.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern const char*
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lto_module_get_target_triple(lto_module_t mod);
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/**
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* Sets triple string with which the object will be codegened.
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*
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* \since LTO_API_VERSION=4
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*/
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extern void
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lto_module_set_target_triple(lto_module_t mod, const char *triple);
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/**
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* Returns the number of symbols in the object module.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern unsigned int
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lto_module_get_num_symbols(lto_module_t mod);
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/**
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* Returns the name of the ith symbol in the object module.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern const char*
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lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
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/**
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* Returns the attributes of the ith symbol in the object module.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_symbol_attributes
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lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
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/**
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* Returns the module's linker options.
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*
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* The linker options may consist of multiple flags. It is the linker's
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* responsibility to split the flags using a platform-specific mechanism.
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*
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* \since LTO_API_VERSION=16
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*/
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extern const char*
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lto_module_get_linkeropts(lto_module_t mod);
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/**
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* Diagnostic severity.
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*
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* \since LTO_API_VERSION=7
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*/
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typedef enum {
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LTO_DS_ERROR = 0,
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LTO_DS_WARNING = 1,
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LTO_DS_REMARK = 3, // Added in LTO_API_VERSION=10.
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LTO_DS_NOTE = 2
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} lto_codegen_diagnostic_severity_t;
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/**
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* Diagnostic handler type.
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* \p severity defines the severity.
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* \p diag is the actual diagnostic.
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* The diagnostic is not prefixed by any of severity keyword, e.g., 'error: '.
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* \p ctxt is used to pass the context set with the diagnostic handler.
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*
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* \since LTO_API_VERSION=7
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*/
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typedef void (*lto_diagnostic_handler_t)(
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lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt);
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/**
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* Set a diagnostic handler and the related context (void *).
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* This is more general than lto_get_error_message, as the diagnostic handler
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* can be called at anytime within lto.
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*
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* \since LTO_API_VERSION=7
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*/
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extern void lto_codegen_set_diagnostic_handler(lto_code_gen_t,
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lto_diagnostic_handler_t,
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void *);
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/**
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* Instantiates a code generator.
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* Returns NULL on error (check lto_get_error_message() for details).
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*
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* All modules added using \a lto_codegen_add_module() must have been created
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* in the same context as the codegen.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_code_gen_t
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lto_codegen_create(void);
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/**
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* Instantiate a code generator in its own context.
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*
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* Instantiates a code generator in its own context. Modules added via \a
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* lto_codegen_add_module() must have all been created in the same context,
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* using \a lto_module_create_in_codegen_context().
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*
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* \since LTO_API_VERSION=11
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*/
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extern lto_code_gen_t
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lto_codegen_create_in_local_context(void);
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/**
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* Frees all code generator and all memory it internally allocated.
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* Upon return the lto_code_gen_t is no longer valid.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern void
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lto_codegen_dispose(lto_code_gen_t);
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/**
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* Add an object module to the set of modules for which code will be generated.
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* Returns true on error (check lto_get_error_message() for details).
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*
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* \c cg and \c mod must both be in the same context. See \a
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* lto_codegen_create_in_local_context() and \a
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* lto_module_create_in_codegen_context().
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod);
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/**
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* Sets the object module for code generation. This will transfer the ownership
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* of the module to the code generator.
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*
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* \c cg and \c mod must both be in the same context.
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*
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* \since LTO_API_VERSION=13
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*/
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extern void
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lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod);
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/**
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* Sets if debug info should be generated.
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* Returns true on error (check lto_get_error_message() for details).
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model);
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/**
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* Sets which PIC code model to generated.
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* Returns true on error (check lto_get_error_message() for details).
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern lto_bool_t
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lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model);
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/**
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* Sets the cpu to generate code for.
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*
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* \since LTO_API_VERSION=4
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*/
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extern void
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lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu);
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/**
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* Sets the location of the assembler tool to run. If not set, libLTO
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* will use gcc to invoke the assembler.
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*
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* \since LTO_API_VERSION=3
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*/
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extern void
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lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
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/**
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* Sets extra arguments that libLTO should pass to the assembler.
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*
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* \since LTO_API_VERSION=4
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*/
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extern void
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lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
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int nargs);
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/**
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* Adds to a list of all global symbols that must exist in the final generated
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* code. If a function is not listed there, it might be inlined into every usage
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* and optimized away.
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern void
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lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol);
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/**
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* Writes a new object file at the specified path that contains the
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* merged contents of all modules added so far.
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* Returns true on error (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=5
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*/
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extern lto_bool_t
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lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path);
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/**
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* Generates code for all added modules into one native object file.
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* This calls lto_codegen_optimize then lto_codegen_compile_optimized.
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*
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* On success returns a pointer to a generated mach-o/ELF buffer and
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* length set to the buffer size. The buffer is owned by the
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* lto_code_gen_t and will be freed when lto_codegen_dispose()
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* is called, or lto_codegen_compile() is called again.
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* On failure, returns NULL (check lto_get_error_message() for details).
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*
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* \since prior to LTO_API_VERSION=3
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*/
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extern const void*
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lto_codegen_compile(lto_code_gen_t cg, size_t* length);
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/**
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* Generates code for all added modules into one native object file.
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* This calls lto_codegen_optimize then lto_codegen_compile_optimized (instead
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* of returning a generated mach-o/ELF buffer, it writes to a file).
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*
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* The name of the file is written to name. Returns true on error.
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*
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* \since LTO_API_VERSION=5
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*/
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extern lto_bool_t
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lto_codegen_compile_to_file(lto_code_gen_t cg, const char** name);
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/**
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* Runs optimization for the merged module. Returns true on error.
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*
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* \since LTO_API_VERSION=12
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*/
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extern lto_bool_t
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lto_codegen_optimize(lto_code_gen_t cg);
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/**
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* Generates code for the optimized merged module into one native object file.
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* It will not run any IR optimizations on the merged module.
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*
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* On success returns a pointer to a generated mach-o/ELF buffer and length set
|
|
* to the buffer size. The buffer is owned by the lto_code_gen_t and will be
|
|
* freed when lto_codegen_dispose() is called, or
|
|
* lto_codegen_compile_optimized() is called again. On failure, returns NULL
|
|
* (check lto_get_error_message() for details).
|
|
*
|
|
* \since LTO_API_VERSION=12
|
|
*/
|
|
extern const void*
|
|
lto_codegen_compile_optimized(lto_code_gen_t cg, size_t* length);
|
|
|
|
/**
|
|
* Returns the runtime API version.
|
|
*
|
|
* \since LTO_API_VERSION=12
|
|
*/
|
|
extern unsigned int
|
|
lto_api_version(void);
|
|
|
|
/**
|
|
* Sets options to help debug codegen bugs.
|
|
*
|
|
* \since prior to LTO_API_VERSION=3
|
|
*/
|
|
extern void
|
|
lto_codegen_debug_options(lto_code_gen_t cg, const char *);
|
|
|
|
/**
|
|
* Initializes LLVM disassemblers.
|
|
* FIXME: This doesn't really belong here.
|
|
*
|
|
* \since LTO_API_VERSION=5
|
|
*/
|
|
extern void
|
|
lto_initialize_disassembler(void);
|
|
|
|
/**
|
|
* Sets if we should run internalize pass during optimization and code
|
|
* generation.
|
|
*
|
|
* \since LTO_API_VERSION=14
|
|
*/
|
|
extern void
|
|
lto_codegen_set_should_internalize(lto_code_gen_t cg,
|
|
lto_bool_t ShouldInternalize);
|
|
|
|
/**
|
|
* Set whether to embed uselists in bitcode.
|
|
*
|
|
* Sets whether \a lto_codegen_write_merged_modules() should embed uselists in
|
|
* output bitcode. This should be turned on for all -save-temps output.
|
|
*
|
|
* \since LTO_API_VERSION=15
|
|
*/
|
|
extern void
|
|
lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
|
|
lto_bool_t ShouldEmbedUselists);
|
|
|
|
/**
|
|
* @} // endgoup LLVMCLTO
|
|
* @defgroup LLVMCTLTO ThinLTO
|
|
* @ingroup LLVMC
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Type to wrap a single object returned by ThinLTO.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
typedef struct {
|
|
const char *Buffer;
|
|
size_t Size;
|
|
} LTOObjectBuffer;
|
|
|
|
/**
|
|
* Instantiates a ThinLTO code generator.
|
|
* Returns NULL on error (check lto_get_error_message() for details).
|
|
*
|
|
*
|
|
* The ThinLTOCodeGenerator is not intended to be reuse for multiple
|
|
* compilation: the model is that the client adds modules to the generator and
|
|
* ask to perform the ThinLTO optimizations / codegen, and finally destroys the
|
|
* codegenerator.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern thinlto_code_gen_t thinlto_create_codegen(void);
|
|
|
|
/**
|
|
* Frees the generator and all memory it internally allocated.
|
|
* Upon return the thinlto_code_gen_t is no longer valid.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_dispose(thinlto_code_gen_t cg);
|
|
|
|
/**
|
|
* Add a module to a ThinLTO code generator. Identifier has to be unique among
|
|
* all the modules in a code generator. The data buffer stays owned by the
|
|
* client, and is expected to be available for the entire lifetime of the
|
|
* thinlto_code_gen_t it is added to.
|
|
*
|
|
* On failure, returns NULL (check lto_get_error_message() for details).
|
|
*
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_add_module(thinlto_code_gen_t cg,
|
|
const char *identifier, const char *data,
|
|
int length);
|
|
|
|
/**
|
|
* Optimize and codegen all the modules added to the codegenerator using
|
|
* ThinLTO. Resulting objects are accessible using thinlto_module_get_object().
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_process(thinlto_code_gen_t cg);
|
|
|
|
/**
|
|
* Returns the number of object files produced by the ThinLTO CodeGenerator.
|
|
*
|
|
* It usually matches the number of input files, but this is not a guarantee of
|
|
* the API and may change in future implementation, so the client should not
|
|
* assume it.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg);
|
|
|
|
/**
|
|
* Returns a reference to the ith object file produced by the ThinLTO
|
|
* CodeGenerator.
|
|
*
|
|
* Client should use \p thinlto_module_get_num_objects() to get the number of
|
|
* available objects.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
|
|
unsigned int index);
|
|
|
|
/**
|
|
* Returns the number of object files produced by the ThinLTO CodeGenerator.
|
|
*
|
|
* It usually matches the number of input files, but this is not a guarantee of
|
|
* the API and may change in future implementation, so the client should not
|
|
* assume it.
|
|
*
|
|
* \since LTO_API_VERSION=21
|
|
*/
|
|
unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg);
|
|
|
|
/**
|
|
* Returns the path to the ith object file produced by the ThinLTO
|
|
* CodeGenerator.
|
|
*
|
|
* Client should use \p thinlto_module_get_num_object_files() to get the number
|
|
* of available objects.
|
|
*
|
|
* \since LTO_API_VERSION=21
|
|
*/
|
|
const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
|
|
unsigned int index);
|
|
|
|
/**
|
|
* Sets which PIC code model to generate.
|
|
* Returns true on error (check lto_get_error_message() for details).
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
|
|
lto_codegen_model);
|
|
|
|
/**
|
|
* Sets the path to a directory to use as a storage for temporary bitcode files.
|
|
* The intention is to make the bitcode files available for debugging at various
|
|
* stage of the pipeline.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
|
|
const char *save_temps_dir);
|
|
|
|
/**
|
|
* Set the path to a directory where to save generated object files. This
|
|
* path can be used by a linker to request on-disk files instead of in-memory
|
|
* buffers. When set, results are available through
|
|
* thinlto_module_get_object_file() instead of thinlto_module_get_object().
|
|
*
|
|
* \since LTO_API_VERSION=21
|
|
*/
|
|
void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
|
|
const char *save_temps_dir);
|
|
|
|
/**
|
|
* Sets the cpu to generate code for.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu);
|
|
|
|
/**
|
|
* Disable CodeGen, only run the stages till codegen and stop. The output will
|
|
* be bitcode.
|
|
*
|
|
* \since LTO_API_VERSION=19
|
|
*/
|
|
extern void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
|
|
lto_bool_t disable);
|
|
|
|
/**
|
|
* Perform CodeGen only: disable all other stages.
|
|
*
|
|
* \since LTO_API_VERSION=19
|
|
*/
|
|
extern void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
|
|
lto_bool_t codegen_only);
|
|
|
|
/**
|
|
* Parse -mllvm style debug options.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_debug_options(const char *const *options, int number);
|
|
|
|
/**
|
|
* Test if a module has support for ThinLTO linking.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern lto_bool_t lto_module_is_thinlto(lto_module_t mod);
|
|
|
|
/**
|
|
* Adds a symbol to the list of 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. For every single module, the functions
|
|
* referenced from code outside of the ThinLTO modules need to be added here.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
|
|
const char *name,
|
|
int length);
|
|
|
|
/**
|
|
* Adds a symbol to the list of global symbols that are cross-referenced between
|
|
* ThinLTO files. If the ThinLTO CodeGenerator can ensure that every
|
|
* references from a ThinLTO module to this symbol is optimized away, then
|
|
* the symbol can be discarded.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
|
|
const char *name,
|
|
int length);
|
|
|
|
/**
|
|
* @} // endgoup LLVMCTLTO
|
|
* @defgroup LLVMCTLTO_CACHING ThinLTO Cache Control
|
|
* @ingroup LLVMCTLTO
|
|
*
|
|
* These entry points control the ThinLTO cache. The cache is intended to
|
|
* support incremental builds, and thus needs to be persistent across builds.
|
|
* The client enables the cache by supplying a path to an existing directory.
|
|
* The code generator will use this to store objects files that may be reused
|
|
* during a subsequent build.
|
|
* To avoid filling the disk space, a few knobs are provided:
|
|
* - The pruning interval limits the frequency at which the garbage collector
|
|
* will try to scan the cache directory to prune expired entries.
|
|
* Setting to a negative number disables the pruning.
|
|
* - The pruning expiration time indicates to the garbage collector how old an
|
|
* entry needs to be to be removed.
|
|
* - Finally, the garbage collector can be instructed to prune the cache until
|
|
* the occupied space goes below a threshold.
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Sets the path to a directory to use as a cache storage for incremental build.
|
|
* Setting this activates caching.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
|
|
const char *cache_dir);
|
|
|
|
/**
|
|
* Sets the cache pruning interval (in seconds). A negative value disables the
|
|
* pruning. An unspecified default value will be applied, and a value of 0 will
|
|
* force prunning to occur.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
|
|
int interval);
|
|
|
|
/**
|
|
* Sets the maximum cache size that can be persistent across build, in terms of
|
|
* percentage of the available space on the disk. Set to 100 to indicate
|
|
* no limit, 50 to indicate that the cache size will not be left over half the
|
|
* available space. A value over 100 will be reduced to 100, a value of 0 will
|
|
* be ignored. An unspecified default value will be applied.
|
|
*
|
|
* The formula looks like:
|
|
* AvailableSpace = FreeSpace + ExistingCacheSize
|
|
* NewCacheSize = AvailableSpace * P/100
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_final_cache_size_relative_to_available_space(
|
|
thinlto_code_gen_t cg, unsigned percentage);
|
|
|
|
/**
|
|
* Sets the expiration (in seconds) for an entry in the cache. An unspecified
|
|
* default value will be applied. A value of 0 will be ignored.
|
|
*
|
|
* \since LTO_API_VERSION=18
|
|
*/
|
|
extern void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
|
|
unsigned expiration);
|
|
|
|
/**
|
|
* Sets the maximum size of the cache directory (in bytes). A value over the
|
|
* amount of available space on the disk will be reduced to the amount of
|
|
* available space. An unspecified default value will be applied. A value of 0
|
|
* will be ignored.
|
|
*
|
|
* \since LTO_API_VERSION=22
|
|
*/
|
|
extern void thinlto_codegen_set_cache_size_bytes(thinlto_code_gen_t cg,
|
|
unsigned max_size_bytes);
|
|
|
|
/**
|
|
* Same as thinlto_codegen_set_cache_size_bytes, except the maximum size is in
|
|
* megabytes (2^20 bytes).
|
|
*
|
|
* \since LTO_API_VERSION=23
|
|
*/
|
|
extern void
|
|
thinlto_codegen_set_cache_size_megabytes(thinlto_code_gen_t cg,
|
|
unsigned max_size_megabytes);
|
|
|
|
/**
|
|
* Sets the maximum number of files in the cache directory. An unspecified
|
|
* default value will be applied. A value of 0 will be ignored.
|
|
*
|
|
* \since LTO_API_VERSION=22
|
|
*/
|
|
extern void thinlto_codegen_set_cache_size_files(thinlto_code_gen_t cg,
|
|
unsigned max_size_files);
|
|
|
|
|
|
|
|
/**
|
|
* @} // endgroup LLVMCTLTO_CACHING
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LLVM_C_LTO_H */
|