828 lines
25 KiB
C
828 lines
25 KiB
C
/*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
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|* *|
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|* The LLVM Compiler Infrastructure *|
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|* *|
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|* This file is distributed under the University of Illinois Open Source *|
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|* License. See LICENSE.TXT for details. *|
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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 21
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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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* \brief 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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* \brief 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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* \brief 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
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* to the buffer size. The buffer is owned by the lto_code_gen_t and will be
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* freed when lto_codegen_dispose() is called, or
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* lto_codegen_compile_optimized() is called again. On failure, returns NULL
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* (check lto_get_error_message() for details).
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*
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* \since LTO_API_VERSION=12
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*/
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extern const void*
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|
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);
|
|
|
|
/**
|
|
* \brief 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
|
|
* be ignored.
|
|
*
|
|
* \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 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);
|
|
|
|
/**
|
|
* @} // endgroup LLVMCTLTO_CACHING
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LLVM_C_LTO_H */
|