/* Built-in and inline functions for gcj Copyright (C) 2001-2014 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. . . Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. The Free Software Foundation is independent of Sun Microsystems, Inc. */ /* Written by Tom Tromey . */ /* FIXME: Still need to include rtl.h here (see below). */ #undef IN_GCC_FRONTEND #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "stor-layout.h" #include "stringpool.h" #include "ggc.h" #include "flags.h" #include "langhooks.h" #include "java-tree.h" /* FIXME: All these headers are necessary for sync_compare_and_swap. Front ends should never have to look at that. */ #include "rtl.h" #include "insn-codes.h" #include "expr.h" #include "optabs.h" static tree max_builtin (tree, tree); static tree min_builtin (tree, tree); static tree abs_builtin (tree, tree); static tree convert_real (tree, tree); static tree java_build_function_call_expr (tree, tree); static tree putObject_builtin (tree, tree); static tree compareAndSwapInt_builtin (tree, tree); static tree compareAndSwapLong_builtin (tree, tree); static tree compareAndSwapObject_builtin (tree, tree); static tree putVolatile_builtin (tree, tree); static tree getVolatile_builtin (tree, tree); static tree VMSupportsCS8_builtin (tree, tree); /* Functions of this type are used to inline a given call. Such a function should either return an expression, if the call is to be inlined, or NULL_TREE if a real call should be emitted. Arguments are method return type and the original CALL_EXPR containing the arguments to the call. */ typedef tree builtin_creator_function (tree, tree); /* Hold a char*, before initialization, or a tree, after initialization. */ union GTY(()) string_or_tree { const char * GTY ((tag ("0"))) s; tree GTY ((tag ("1"))) t; }; /* Used to hold a single builtin record. */ struct GTY(()) builtin_record { union string_or_tree GTY ((desc ("1"))) class_name; union string_or_tree GTY ((desc ("1"))) method_name; builtin_creator_function * GTY((skip)) creator; enum built_in_function builtin_code; }; static GTY(()) struct builtin_record java_builtins[] = { { { "java.lang.Math" }, { "min" }, min_builtin, (enum built_in_function) 0 }, { { "java.lang.Math" }, { "max" }, max_builtin, (enum built_in_function) 0 }, { { "java.lang.Math" }, { "abs" }, abs_builtin, (enum built_in_function) 0 }, { { "java.lang.Math" }, { "acos" }, NULL, BUILT_IN_ACOS }, { { "java.lang.Math" }, { "asin" }, NULL, BUILT_IN_ASIN }, { { "java.lang.Math" }, { "atan" }, NULL, BUILT_IN_ATAN }, { { "java.lang.Math" }, { "atan2" }, NULL, BUILT_IN_ATAN2 }, { { "java.lang.Math" }, { "ceil" }, NULL, BUILT_IN_CEIL }, { { "java.lang.Math" }, { "cos" }, NULL, BUILT_IN_COS }, { { "java.lang.Math" }, { "exp" }, NULL, BUILT_IN_EXP }, { { "java.lang.Math" }, { "floor" }, NULL, BUILT_IN_FLOOR }, { { "java.lang.Math" }, { "log" }, NULL, BUILT_IN_LOG }, { { "java.lang.Math" }, { "pow" }, NULL, BUILT_IN_POW }, { { "java.lang.Math" }, { "sin" }, NULL, BUILT_IN_SIN }, { { "java.lang.Math" }, { "sqrt" }, NULL, BUILT_IN_SQRT }, { { "java.lang.Math" }, { "tan" }, NULL, BUILT_IN_TAN }, { { "java.lang.Float" }, { "intBitsToFloat" }, convert_real, (enum built_in_function) 0 }, { { "java.lang.Double" }, { "longBitsToDouble" }, convert_real, (enum built_in_function) 0 }, { { "java.lang.Float" }, { "floatToRawIntBits" }, convert_real, (enum built_in_function) 0 }, { { "java.lang.Double" }, { "doubleToRawLongBits" }, convert_real, (enum built_in_function) 0 }, { { "sun.misc.Unsafe" }, { "putInt" }, putObject_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putLong" }, putObject_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putObject" }, putObject_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "compareAndSwapInt" }, compareAndSwapInt_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "compareAndSwapLong" }, compareAndSwapLong_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "compareAndSwapObject" }, compareAndSwapObject_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putOrderedInt" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putOrderedLong" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putOrderedObject" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putIntVolatile" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putLongVolatile" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "putObjectVolatile" }, putVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "getObjectVolatile" }, getVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "getIntVolatile" }, getVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "getLongVolatile" }, getVolatile_builtin, (enum built_in_function) 0}, { { "sun.misc.Unsafe" }, { "getLong" }, getVolatile_builtin, (enum built_in_function) 0}, { { "java.util.concurrent.atomic.AtomicLong" }, { "VMSupportsCS8" }, VMSupportsCS8_builtin, (enum built_in_function) 0}, { { NULL }, { NULL }, NULL, END_BUILTINS } }; /* Internal functions which implement various builtin conversions. */ static tree max_builtin (tree method_return_type, tree orig_call) { /* MAX_EXPR does not handle -0.0 in the Java style. */ if (TREE_CODE (method_return_type) == REAL_TYPE) return NULL_TREE; return fold_build2 (MAX_EXPR, method_return_type, CALL_EXPR_ARG (orig_call, 0), CALL_EXPR_ARG (orig_call, 1)); } static tree min_builtin (tree method_return_type, tree orig_call) { /* MIN_EXPR does not handle -0.0 in the Java style. */ if (TREE_CODE (method_return_type) == REAL_TYPE) return NULL_TREE; return fold_build2 (MIN_EXPR, method_return_type, CALL_EXPR_ARG (orig_call, 0), CALL_EXPR_ARG (orig_call, 1)); } static tree abs_builtin (tree method_return_type, tree orig_call) { return fold_build1 (ABS_EXPR, method_return_type, CALL_EXPR_ARG (orig_call, 0)); } /* Construct a new call to FN using the arguments from ORIG_CALL. */ static tree java_build_function_call_expr (tree fn, tree orig_call) { int nargs = call_expr_nargs (orig_call); switch (nargs) { /* Although we could handle the 0-3 argument cases using the general logic in the default case, splitting them out permits folding to be performed without constructing a temporary CALL_EXPR. */ case 0: return build_call_expr (fn, 0); case 1: return build_call_expr (fn, 1, CALL_EXPR_ARG (orig_call, 0)); case 2: return build_call_expr (fn, 2, CALL_EXPR_ARG (orig_call, 0), CALL_EXPR_ARG (orig_call, 1)); case 3: return build_call_expr (fn, 3, CALL_EXPR_ARG (orig_call, 0), CALL_EXPR_ARG (orig_call, 1), CALL_EXPR_ARG (orig_call, 2)); default: { tree fntype = TREE_TYPE (fn); fn = build1 (ADDR_EXPR, build_pointer_type (fntype), fn); return fold (build_call_array (TREE_TYPE (fntype), fn, nargs, CALL_EXPR_ARGP (orig_call))); } } } static tree convert_real (tree method_return_type, tree orig_call) { return build1 (VIEW_CONVERT_EXPR, method_return_type, CALL_EXPR_ARG (orig_call, 0)); } /* Provide builtin support for atomic operations. These are documented at length in libjava/sun/misc/Unsafe.java. */ /* FIXME. There are still a few things wrong with this logic. In particular, atomic writes of multi-word integers are not truly atomic: this requires more work. In general, double-word compare-and-swap cannot portably be implemented, so we need some kind of fallback for 32-bit machines. */ /* Macros to unmarshal arguments from a CALL_EXPR into a few variables. We also convert the offset arg from a long to an integer that is the same size as a pointer. */ #define UNMARSHAL3(METHOD_CALL) \ tree this_arg, obj_arg, offset_arg; \ do \ { \ tree orig_method_call = METHOD_CALL; \ this_arg = CALL_EXPR_ARG (orig_method_call, 0); \ obj_arg = CALL_EXPR_ARG (orig_method_call, 1); \ offset_arg = fold_convert (java_type_for_size (POINTER_SIZE, 0), \ CALL_EXPR_ARG (orig_method_call, 2)); \ } \ while (0) #define UNMARSHAL4(METHOD_CALL) \ tree value_type, this_arg, obj_arg, offset_arg, value_arg; \ do \ { \ tree orig_method_call = METHOD_CALL; \ this_arg = CALL_EXPR_ARG (orig_method_call, 0); \ obj_arg = CALL_EXPR_ARG (orig_method_call, 1); \ offset_arg = fold_convert (java_type_for_size (POINTER_SIZE, 0), \ CALL_EXPR_ARG (orig_method_call, 2)); \ value_arg = CALL_EXPR_ARG (orig_method_call, 3); \ value_type = TREE_TYPE (value_arg); \ } \ while (0) #define UNMARSHAL5(METHOD_CALL) \ tree value_type, this_arg, obj_arg, offset_arg, expected_arg, value_arg; \ do \ { \ tree orig_method_call = METHOD_CALL; \ this_arg = CALL_EXPR_ARG (orig_method_call, 0); \ obj_arg = CALL_EXPR_ARG (orig_method_call, 1); \ offset_arg = fold_convert (java_type_for_size (POINTER_SIZE, 0), \ CALL_EXPR_ARG (orig_method_call, 2)); \ expected_arg = CALL_EXPR_ARG (orig_method_call, 3); \ value_arg = CALL_EXPR_ARG (orig_method_call, 4); \ value_type = TREE_TYPE (value_arg); \ } \ while (0) /* Add an address to an offset, forming a sum. */ static tree build_addr_sum (tree type, tree addr, tree offset) { tree ptr_type = build_pointer_type (type); return fold_build_pointer_plus (fold_convert (ptr_type, addr), offset); } /* Make sure that this-arg is non-NULL. This is a security check. */ static tree build_check_this (tree stmt, tree this_arg) { return build2 (COMPOUND_EXPR, TREE_TYPE (stmt), java_check_reference (this_arg, 1), stmt); } /* Now the builtins. These correspond to the primitive functions in libjava/sun/misc/natUnsafe.cc. */ static tree putObject_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { tree addr, stmt; UNMARSHAL4 (orig_call); addr = build_addr_sum (value_type, obj_arg, offset_arg); stmt = fold_build2 (MODIFY_EXPR, value_type, build_java_indirect_ref (value_type, addr, flag_check_references), value_arg); return build_check_this (stmt, this_arg); } static tree compareAndSwapInt_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { enum machine_mode mode = TYPE_MODE (int_type_node); if (can_compare_and_swap_p (mode, flag_use_atomic_builtins)) { tree addr, stmt; enum built_in_function fncode = BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_4; UNMARSHAL5 (orig_call); (void) value_type; /* Avoid set but not used warning. */ addr = build_addr_sum (int_type_node, obj_arg, offset_arg); stmt = build_call_expr (builtin_decl_explicit (fncode), 3, addr, expected_arg, value_arg); return build_check_this (stmt, this_arg); } return NULL_TREE; } static tree compareAndSwapLong_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { enum machine_mode mode = TYPE_MODE (long_type_node); /* We don't trust flag_use_atomic_builtins for multi-word compareAndSwap. Some machines such as ARM have atomic libfuncs but not the multi-word versions. */ if (can_compare_and_swap_p (mode, (flag_use_atomic_builtins && GET_MODE_SIZE (mode) <= UNITS_PER_WORD))) { tree addr, stmt; enum built_in_function fncode = BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_8; UNMARSHAL5 (orig_call); (void) value_type; /* Avoid set but not used warning. */ addr = build_addr_sum (long_type_node, obj_arg, offset_arg); stmt = build_call_expr (builtin_decl_explicit (fncode), 3, addr, expected_arg, value_arg); return build_check_this (stmt, this_arg); } return NULL_TREE; } static tree compareAndSwapObject_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { enum machine_mode mode = TYPE_MODE (ptr_type_node); if (can_compare_and_swap_p (mode, flag_use_atomic_builtins)) { tree addr, stmt; enum built_in_function builtin; UNMARSHAL5 (orig_call); builtin = (POINTER_SIZE == 32 ? BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_4 : BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_8); addr = build_addr_sum (value_type, obj_arg, offset_arg); stmt = build_call_expr (builtin_decl_explicit (builtin), 3, addr, expected_arg, value_arg); return build_check_this (stmt, this_arg); } return NULL_TREE; } static tree putVolatile_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { tree addr, stmt, modify_stmt; UNMARSHAL4 (orig_call); addr = build_addr_sum (value_type, obj_arg, offset_arg); addr = fold_convert (build_pointer_type (build_type_variant (value_type, 0, 1)), addr); stmt = build_call_expr (builtin_decl_explicit (BUILT_IN_SYNC_SYNCHRONIZE), 0); modify_stmt = fold_build2 (MODIFY_EXPR, value_type, build_java_indirect_ref (value_type, addr, flag_check_references), value_arg); stmt = build2 (COMPOUND_EXPR, TREE_TYPE (modify_stmt), stmt, modify_stmt); return build_check_this (stmt, this_arg); } static tree getVolatile_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree orig_call) { tree addr, stmt, modify_stmt, tmp; UNMARSHAL3 (orig_call); (void) this_arg; /* Avoid set but not used warning. */ addr = build_addr_sum (method_return_type, obj_arg, offset_arg); addr = fold_convert (build_pointer_type (build_type_variant (method_return_type, 0, 1)), addr); stmt = build_call_expr (builtin_decl_explicit (BUILT_IN_SYNC_SYNCHRONIZE), 0); tmp = build_decl (BUILTINS_LOCATION, VAR_DECL, NULL, method_return_type); DECL_IGNORED_P (tmp) = 1; DECL_ARTIFICIAL (tmp) = 1; pushdecl (tmp); modify_stmt = fold_build2 (MODIFY_EXPR, method_return_type, tmp, build_java_indirect_ref (method_return_type, addr, flag_check_references)); stmt = build2 (COMPOUND_EXPR, void_type_node, modify_stmt, stmt); stmt = build2 (COMPOUND_EXPR, method_return_type, stmt, tmp); return stmt; } static tree VMSupportsCS8_builtin (tree method_return_type, tree orig_call ATTRIBUTE_UNUSED) { enum machine_mode mode = TYPE_MODE (long_type_node); gcc_assert (method_return_type == boolean_type_node); if (can_compare_and_swap_p (mode, false)) return boolean_true_node; else return boolean_false_node; } /* Define a single builtin. */ static void define_builtin (enum built_in_function val, const char *name, tree type, const char *libname, int flags) { tree decl; decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, get_identifier (name), type); DECL_EXTERNAL (decl) = 1; TREE_PUBLIC (decl) = 1; SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname)); pushdecl (decl); DECL_BUILT_IN_CLASS (decl) = BUILT_IN_NORMAL; DECL_FUNCTION_CODE (decl) = val; set_call_expr_flags (decl, flags); set_builtin_decl (val, decl, true); } /* Initialize the builtins. */ void initialize_builtins (void) { tree double_ftype_double, double_ftype_double_double; tree float_ftype_float_float; tree boolean_ftype_boolean_boolean; int i; for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i) { tree klass_id = get_identifier (java_builtins[i].class_name.s); tree m = get_identifier (java_builtins[i].method_name.s); java_builtins[i].class_name.t = klass_id; java_builtins[i].method_name.t = m; } void_list_node = end_params_node; float_ftype_float_float = build_function_type_list (float_type_node, float_type_node, float_type_node, NULL_TREE); double_ftype_double = build_function_type_list (double_type_node, double_type_node, NULL_TREE); double_ftype_double_double = build_function_type_list (double_type_node, double_type_node, double_type_node, NULL_TREE); define_builtin (BUILT_IN_FMOD, "__builtin_fmod", double_ftype_double_double, "fmod", ECF_CONST); define_builtin (BUILT_IN_FMODF, "__builtin_fmodf", float_ftype_float_float, "fmodf", ECF_CONST); define_builtin (BUILT_IN_ACOS, "__builtin_acos", double_ftype_double, "_ZN4java4lang4Math4acosEJdd", ECF_CONST); define_builtin (BUILT_IN_ASIN, "__builtin_asin", double_ftype_double, "_ZN4java4lang4Math4asinEJdd", ECF_CONST); define_builtin (BUILT_IN_ATAN, "__builtin_atan", double_ftype_double, "_ZN4java4lang4Math4atanEJdd", ECF_CONST); define_builtin (BUILT_IN_ATAN2, "__builtin_atan2", double_ftype_double_double, "_ZN4java4lang4Math5atan2EJddd", ECF_CONST); define_builtin (BUILT_IN_CEIL, "__builtin_ceil", double_ftype_double, "_ZN4java4lang4Math4ceilEJdd", ECF_CONST); define_builtin (BUILT_IN_COS, "__builtin_cos", double_ftype_double, "_ZN4java4lang4Math3cosEJdd", ECF_CONST); define_builtin (BUILT_IN_EXP, "__builtin_exp", double_ftype_double, "_ZN4java4lang4Math3expEJdd", ECF_CONST); define_builtin (BUILT_IN_FLOOR, "__builtin_floor", double_ftype_double, "_ZN4java4lang4Math5floorEJdd", ECF_CONST); define_builtin (BUILT_IN_LOG, "__builtin_log", double_ftype_double, "_ZN4java4lang4Math3logEJdd", ECF_CONST); define_builtin (BUILT_IN_POW, "__builtin_pow", double_ftype_double_double, "_ZN4java4lang4Math3powEJddd", ECF_CONST); define_builtin (BUILT_IN_SIN, "__builtin_sin", double_ftype_double, "_ZN4java4lang4Math3sinEJdd", ECF_CONST); define_builtin (BUILT_IN_SQRT, "__builtin_sqrt", double_ftype_double, "_ZN4java4lang4Math4sqrtEJdd", ECF_CONST); define_builtin (BUILT_IN_TAN, "__builtin_tan", double_ftype_double, "_ZN4java4lang4Math3tanEJdd", ECF_CONST); boolean_ftype_boolean_boolean = build_function_type_list (boolean_type_node, boolean_type_node, boolean_type_node, NULL_TREE); define_builtin (BUILT_IN_EXPECT, "__builtin_expect", boolean_ftype_boolean_boolean, "__builtin_expect", ECF_CONST | ECF_NOTHROW); define_builtin (BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_4, "__sync_bool_compare_and_swap_4", build_function_type_list (boolean_type_node, int_type_node, build_pointer_type (int_type_node), int_type_node, NULL_TREE), "__sync_bool_compare_and_swap_4", ECF_NOTHROW | ECF_LEAF); define_builtin (BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_8, "__sync_bool_compare_and_swap_8", build_function_type_list (boolean_type_node, long_type_node, build_pointer_type (long_type_node), int_type_node, NULL_TREE), "__sync_bool_compare_and_swap_8", ECF_NOTHROW | ECF_LEAF); define_builtin (BUILT_IN_SYNC_SYNCHRONIZE, "__sync_synchronize", build_function_type_list (void_type_node, NULL_TREE), "__sync_synchronize", ECF_NOTHROW | ECF_LEAF); define_builtin (BUILT_IN_RETURN_ADDRESS, "__builtin_return_address", build_function_type_list (ptr_type_node, int_type_node, NULL_TREE), "__builtin_return_address", ECF_NOTHROW | ECF_LEAF); define_builtin (BUILT_IN_TRAP, "__builtin_trap", build_function_type_list (void_type_node, NULL_TREE), "__builtin_trap", ECF_NOTHROW | ECF_LEAF | ECF_NORETURN); build_common_builtin_nodes (); } /* If the call matches a builtin, return the appropriate builtin expression instead. */ tree check_for_builtin (tree method, tree call) { if (optimize && TREE_CODE (call) == CALL_EXPR) { int i; tree method_class = DECL_NAME (TYPE_NAME (DECL_CONTEXT (method))); tree method_name = DECL_NAME (method); tree method_return_type = TREE_TYPE (TREE_TYPE (method)); for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i) { if (method_class == java_builtins[i].class_name.t && method_name == java_builtins[i].method_name.t) { tree fn; if (java_builtins[i].creator != NULL) { tree result = (*java_builtins[i].creator) (method_return_type, call); return result == NULL_TREE ? call : result; } /* Builtin functions emit a direct call which is incompatible with the BC-ABI. */ if (flag_indirect_dispatch) return call; fn = builtin_decl_explicit (java_builtins[i].builtin_code); if (fn == NULL_TREE) return call; return java_build_function_call_expr (fn, call); } } } return call; } #include "gt-java-builtins.h"