builtin-types.def (BT_FN_VOID_CONST_PTR): New.
* builtin-types.def (BT_FN_VOID_CONST_PTR): New.
(BT_FN_PTR_CONST_PTR): New.
(BT_FN_CONST_PTR_CONST_PTR): New.
(BT_FN_PTR_CONST_PTR_SIZE): New.
(BT_FN_PTR_CONST_PTR_CONST_PTR): New.
(BT_FN_VOID_PTRPTR_CONST_PTR): New.
(BT_FN_VOID_CONST_PTR_SIZE): New.
(BT_FN_PTR_CONST_PTR_CONST_PTR_SIZE): New.
* chkp-builtins.def: New.
* builtins.def: include chkp-builtins.def.
(DEF_CHKP_BUILTIN): New.
* builtins.c (expand_builtin): Support BUILT_IN_CHKP_INIT_PTR_BOUNDS,
BUILT_IN_CHKP_NULL_PTR_BOUNDS, BUILT_IN_CHKP_COPY_PTR_BOUNDS,
BUILT_IN_CHKP_CHECK_PTR_LBOUNDS, BUILT_IN_CHKP_CHECK_PTR_UBOUNDS,
BUILT_IN_CHKP_CHECK_PTR_BOUNDS, BUILT_IN_CHKP_SET_PTR_BOUNDS,
BUILT_IN_CHKP_NARROW_PTR_BOUNDS, BUILT_IN_CHKP_STORE_PTR_BOUNDS,
BUILT_IN_CHKP_GET_PTR_LBOUND, BUILT_IN_CHKP_GET_PTR_UBOUND,
BUILT_IN_CHKP_BNDMK, BUILT_IN_CHKP_BNDSTX, BUILT_IN_CHKP_BNDCL,
BUILT_IN_CHKP_BNDCU, BUILT_IN_CHKP_BNDLDX, BUILT_IN_CHKP_BNDRET,
BUILT_IN_CHKP_INTERSECT, BUILT_IN_CHKP_ARG_BND, BUILT_IN_CHKP_NARROW,
BUILT_IN_CHKP_EXTRACT_LOWER, BUILT_IN_CHKP_EXTRACT_UPPER.
* common.opt (fcheck-pointer-bounds): New.
* toplev.c (process_options): Check Pointer Bounds Checker is supported.
* doc/extend.texi: Document Pointer Bounds Checker built-in functions.
From-SVN: r204196
This commit is contained in:
Ilya Enkovich
Kirill Yukhin
parent
f481a2ce85
commit
109719ebd4
7 changed files with 286 additions and 1 deletions
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@ -1,3 +1,30 @@
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2013-10-29 Ilya Enkovich <ilya.enkovich@intel.com>
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* builtin-types.def (BT_FN_VOID_CONST_PTR): New.
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(BT_FN_PTR_CONST_PTR): New.
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(BT_FN_CONST_PTR_CONST_PTR): New.
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(BT_FN_PTR_CONST_PTR_SIZE): New.
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(BT_FN_PTR_CONST_PTR_CONST_PTR): New.
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(BT_FN_VOID_PTRPTR_CONST_PTR): New.
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(BT_FN_VOID_CONST_PTR_SIZE): New.
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(BT_FN_PTR_CONST_PTR_CONST_PTR_SIZE): New.
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* chkp-builtins.def: New.
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* builtins.def: include chkp-builtins.def.
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(DEF_CHKP_BUILTIN): New.
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* builtins.c (expand_builtin): Support BUILT_IN_CHKP_INIT_PTR_BOUNDS,
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BUILT_IN_CHKP_NULL_PTR_BOUNDS, BUILT_IN_CHKP_COPY_PTR_BOUNDS,
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BUILT_IN_CHKP_CHECK_PTR_LBOUNDS, BUILT_IN_CHKP_CHECK_PTR_UBOUNDS,
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BUILT_IN_CHKP_CHECK_PTR_BOUNDS, BUILT_IN_CHKP_SET_PTR_BOUNDS,
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BUILT_IN_CHKP_NARROW_PTR_BOUNDS, BUILT_IN_CHKP_STORE_PTR_BOUNDS,
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BUILT_IN_CHKP_GET_PTR_LBOUND, BUILT_IN_CHKP_GET_PTR_UBOUND,
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BUILT_IN_CHKP_BNDMK, BUILT_IN_CHKP_BNDSTX, BUILT_IN_CHKP_BNDCL,
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BUILT_IN_CHKP_BNDCU, BUILT_IN_CHKP_BNDLDX, BUILT_IN_CHKP_BNDRET,
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BUILT_IN_CHKP_INTERSECT, BUILT_IN_CHKP_ARG_BND, BUILT_IN_CHKP_NARROW,
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BUILT_IN_CHKP_EXTRACT_LOWER, BUILT_IN_CHKP_EXTRACT_UPPER.
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* common.opt (fcheck-pointer-bounds): New.
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* toplev.c (process_options): Check Pointer Bounds Checker is supported.
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* doc/extend.texi: Document Pointer Bounds Checker built-in functions.
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2013-10-30 Ilya Enkovich <ilya.enkovich@intel.com>
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* target.def (builtin_chkp_function): New.
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@ -226,6 +226,7 @@ DEF_FUNCTION_TYPE_1 (BT_FN_DFLOAT64_DFLOAT64, BT_DFLOAT64, BT_DFLOAT64)
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DEF_FUNCTION_TYPE_1 (BT_FN_DFLOAT128_DFLOAT128, BT_DFLOAT128, BT_DFLOAT128)
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DEF_FUNCTION_TYPE_1 (BT_FN_VOID_VPTR, BT_VOID, BT_VOLATILE_PTR)
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DEF_FUNCTION_TYPE_1 (BT_FN_VOID_PTRPTR, BT_VOID, BT_PTR_PTR)
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DEF_FUNCTION_TYPE_1 (BT_FN_VOID_CONST_PTR, BT_VOID, BT_CONST_PTR)
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DEF_FUNCTION_TYPE_1 (BT_FN_UINT_UINT, BT_UINT, BT_UINT)
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DEF_FUNCTION_TYPE_1 (BT_FN_ULONG_ULONG, BT_ULONG, BT_ULONG)
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DEF_FUNCTION_TYPE_1 (BT_FN_ULONGLONG_ULONGLONG, BT_ULONGLONG, BT_ULONGLONG)
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@ -233,6 +234,8 @@ DEF_FUNCTION_TYPE_1 (BT_FN_UINT16_UINT16, BT_UINT16, BT_UINT16)
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DEF_FUNCTION_TYPE_1 (BT_FN_UINT32_UINT32, BT_UINT32, BT_UINT32)
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DEF_FUNCTION_TYPE_1 (BT_FN_UINT64_UINT64, BT_UINT64, BT_UINT64)
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DEF_FUNCTION_TYPE_1 (BT_FN_BOOL_INT, BT_BOOL, BT_INT)
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DEF_FUNCTION_TYPE_1 (BT_FN_PTR_CONST_PTR, BT_PTR, BT_CONST_PTR)
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DEF_FUNCTION_TYPE_1 (BT_FN_CONST_PTR_CONST_PTR, BT_CONST_PTR, BT_CONST_PTR)
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DEF_POINTER_TYPE (BT_PTR_FN_VOID_PTR, BT_FN_VOID_PTR)
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@ -346,6 +349,10 @@ DEF_FUNCTION_TYPE_2 (BT_FN_BOOL_SIZE_CONST_VPTR, BT_BOOL, BT_SIZE,
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BT_CONST_VOLATILE_PTR)
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DEF_FUNCTION_TYPE_2 (BT_FN_BOOL_INT_BOOL, BT_BOOL, BT_INT, BT_BOOL)
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DEF_FUNCTION_TYPE_2 (BT_FN_VOID_UINT_UINT, BT_VOID, BT_UINT, BT_UINT)
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DEF_FUNCTION_TYPE_2 (BT_FN_PTR_CONST_PTR_SIZE, BT_PTR, BT_CONST_PTR, BT_SIZE)
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DEF_FUNCTION_TYPE_2 (BT_FN_PTR_CONST_PTR_CONST_PTR, BT_PTR, BT_CONST_PTR, BT_CONST_PTR)
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DEF_FUNCTION_TYPE_2 (BT_FN_VOID_PTRPTR_CONST_PTR, BT_VOID, BT_PTR_PTR, BT_CONST_PTR)
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DEF_FUNCTION_TYPE_2 (BT_FN_VOID_CONST_PTR_SIZE, BT_VOID, BT_CONST_PTR, BT_SIZE)
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DEF_POINTER_TYPE (BT_PTR_FN_VOID_PTR_PTR, BT_FN_VOID_PTR_PTR)
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@ -428,6 +435,7 @@ DEF_FUNCTION_TYPE_3 (BT_FN_VOID_VPTR_I2_INT, BT_VOID, BT_VOLATILE_PTR, BT_I2, BT
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DEF_FUNCTION_TYPE_3 (BT_FN_VOID_VPTR_I4_INT, BT_VOID, BT_VOLATILE_PTR, BT_I4, BT_INT)
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DEF_FUNCTION_TYPE_3 (BT_FN_VOID_VPTR_I8_INT, BT_VOID, BT_VOLATILE_PTR, BT_I8, BT_INT)
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DEF_FUNCTION_TYPE_3 (BT_FN_VOID_VPTR_I16_INT, BT_VOID, BT_VOLATILE_PTR, BT_I16, BT_INT)
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DEF_FUNCTION_TYPE_3 (BT_FN_PTR_CONST_PTR_CONST_PTR_SIZE, BT_PTR, BT_CONST_PTR, BT_CONST_PTR, BT_SIZE)
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DEF_FUNCTION_TYPE_4 (BT_FN_SIZE_CONST_PTR_SIZE_SIZE_FILEPTR,
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BT_SIZE, BT_CONST_PTR, BT_SIZE, BT_SIZE, BT_FILEPTR)
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@ -5646,7 +5646,18 @@ expand_builtin (tree exp, rtx target, rtx subtarget, enum machine_mode mode,
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&& fcode != BUILT_IN_EXECVE
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&& fcode != BUILT_IN_ALLOCA
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&& fcode != BUILT_IN_ALLOCA_WITH_ALIGN
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&& fcode != BUILT_IN_FREE)
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&& fcode != BUILT_IN_FREE
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&& fcode != BUILT_IN_CHKP_SET_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_INIT_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_NULL_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_COPY_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_NARROW_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_STORE_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_CHECK_PTR_LBOUNDS
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&& fcode != BUILT_IN_CHKP_CHECK_PTR_UBOUNDS
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&& fcode != BUILT_IN_CHKP_CHECK_PTR_BOUNDS
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&& fcode != BUILT_IN_CHKP_GET_PTR_LBOUND
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&& fcode != BUILT_IN_CHKP_GET_PTR_UBOUND)
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return expand_call (exp, target, ignore);
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/* The built-in function expanders test for target == const0_rtx
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@ -6698,6 +6709,51 @@ expand_builtin (tree exp, rtx target, rtx subtarget, enum machine_mode mode,
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expand_builtin_cilk_pop_frame (exp);
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return const0_rtx;
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case BUILT_IN_CHKP_INIT_PTR_BOUNDS:
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case BUILT_IN_CHKP_NULL_PTR_BOUNDS:
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case BUILT_IN_CHKP_COPY_PTR_BOUNDS:
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return expand_normal (CALL_EXPR_ARG (exp, 0));
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case BUILT_IN_CHKP_CHECK_PTR_LBOUNDS:
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case BUILT_IN_CHKP_CHECK_PTR_UBOUNDS:
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case BUILT_IN_CHKP_CHECK_PTR_BOUNDS:
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case BUILT_IN_CHKP_SET_PTR_BOUNDS:
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case BUILT_IN_CHKP_NARROW_PTR_BOUNDS:
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case BUILT_IN_CHKP_STORE_PTR_BOUNDS:
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case BUILT_IN_CHKP_GET_PTR_LBOUND:
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case BUILT_IN_CHKP_GET_PTR_UBOUND:
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/* We allow user CHKP builtins if Pointer Bounds
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Checker is off. */
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if (!flag_check_pointer_bounds)
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{
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if (fcode == BUILT_IN_CHKP_SET_PTR_BOUNDS
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|| fcode == BUILT_IN_CHKP_NARROW_PTR_BOUNDS)
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return expand_normal (CALL_EXPR_ARG (exp, 0));
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else if (fcode == BUILT_IN_CHKP_GET_PTR_LBOUND)
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return expand_normal (size_zero_node);
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else if (fcode == BUILT_IN_CHKP_GET_PTR_UBOUND)
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return expand_normal (size_int (-1));
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else
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return const0_rtx;
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}
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/* FALLTHROUGH */
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case BUILT_IN_CHKP_BNDMK:
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case BUILT_IN_CHKP_BNDSTX:
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case BUILT_IN_CHKP_BNDCL:
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case BUILT_IN_CHKP_BNDCU:
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case BUILT_IN_CHKP_BNDLDX:
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case BUILT_IN_CHKP_BNDRET:
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case BUILT_IN_CHKP_INTERSECT:
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case BUILT_IN_CHKP_ARG_BND:
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case BUILT_IN_CHKP_NARROW:
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case BUILT_IN_CHKP_EXTRACT_LOWER:
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case BUILT_IN_CHKP_EXTRACT_UPPER:
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/* Software implementation of pointers checker is NYI.
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Target support is required. */
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error ("Your target platform does not support -fcheck-pointers");
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break;
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default: /* just do library call, if unknown builtin */
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break;
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}
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@ -176,6 +176,12 @@ along with GCC; see the file COPYING3. If not see
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DEF_BUILTIN (ENUM, NAME, BUILT_IN_NORMAL, BT_FN_INT_VAR, BT_LAST, \
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false, false, false, ATTRS, false, flag_enable_cilkplus)
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/* Builtin used by the implementation of Pointer Bounds Checker. */
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#undef DEF_CHKP_BUILTIN
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#define DEF_CHKP_BUILTIN(ENUM, NAME, TYPE, ATTRS) \
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DEF_BUILTIN (ENUM, "__builtin_" NAME, BUILT_IN_NORMAL, TYPE, TYPE, \
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true, true, false, ATTRS, true, true)
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/* Define an attribute list for math functions that are normally
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"impure" because some of them may write into global memory for
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`errno'. If !flag_errno_math they are instead "const". */
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@ -864,3 +870,6 @@ DEF_GCC_BUILTIN (BUILT_IN_LINE, "LINE", BT_FN_INT, ATTR_NOTHROW_LEAF_LIST)
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/* Cilk Plus builtins. */
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#include "cilkplus.def"
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/* Pointer Bounds Checker builtins. */
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#include "chkp-builtins.def"
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@ -874,6 +874,11 @@ fbounds-check
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Common Report Var(flag_bounds_check)
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Generate code to check bounds before indexing arrays
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fcheck-pointer-bounds
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Common Report Var(flag_check_pointer_bounds)
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Add Pointer Bounds Checker instrumentation. fchkp-* flags are used to
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control instrumentation. Currently available for C, C++ and ObjC.
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fbranch-count-reg
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Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
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Replace add, compare, branch with branch on count register
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@ -82,6 +82,7 @@ extensions, accepted by GCC in C90 mode and in C++.
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* x86 specific memory model extensions for transactional memory:: x86 memory models.
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* Object Size Checking:: Built-in functions for limited buffer overflow
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checking.
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* Pointer Bounds Checker builtins:: Built-in functions for Pointer Bounds Checker.
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* Cilk Plus Builtins:: Built-in functions for the Cilk Plus language extension.
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* Other Builtins:: Other built-in functions.
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* Target Builtins:: Built-in functions specific to particular targets.
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@ -7752,6 +7753,176 @@ format string @var{fmt}. If the compiler is able to optimize them to
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@code{fputc} etc.@: functions, it does, otherwise the checking function
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is called and the @var{flag} argument passed to it.
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@node Pointer Bounds Checker builtins
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@section Pointer Bounds Checker Built-in Functions
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@findex __builtin___bnd_set_ptr_bounds
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@findex __builtin___bnd_narrow_ptr_bounds
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@findex __builtin___bnd_copy_ptr_bounds
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@findex __builtin___bnd_init_ptr_bounds
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@findex __builtin___bnd_null_ptr_bounds
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@findex __builtin___bnd_store_ptr_bounds
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@findex __builtin___bnd_chk_ptr_lbounds
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@findex __builtin___bnd_chk_ptr_ubounds
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@findex __builtin___bnd_chk_ptr_bounds
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@findex __builtin___bnd_get_ptr_lbound
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@findex __builtin___bnd_get_ptr_ubound
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GCC provides a set of built-in functions to control Pointer Bounds Checker
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instrumentation. Note that all Pointer Bounds Checker builtins are allowed
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to use even if you compile with Pointer Bounds Checker off. But functions
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behavior may differ in such case.
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@deftypefn {Built-in Function} void * __builtin___bnd_set_ptr_bounds (const void * @var{q}, size_t @var{size})
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This built-in function returns a new pointer with the value of @var{q}, and
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associate it with the bounds [@var{q}, @var{q}+@var{size}-1]. With Pointer
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Bounds Checker off built-in function just returns the first argument.
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@smallexample
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extern void *__wrap_malloc (size_t n)
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@{
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void *p = (void *)__real_malloc (n);
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if (!p) return __builtin___bnd_null_ptr_bounds (p);
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return __builtin___bnd_set_ptr_bounds (p, n);
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@}
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@end smallexample
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_narrow_ptr_bounds (const void * @var{p}, const void * @var{q}, size_t @var{size})
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This built-in function returns a new pointer with the value of @var{p}
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and associate it with the narrowed bounds formed by the intersection
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of bounds associated with @var{q} and the [@var{p}, @var{p} + @var{size} - 1].
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With Pointer Bounds Checker off built-in function just returns the first
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argument.
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@smallexample
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void init_objects (object *objs, size_t size)
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@{
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size_t i;
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/* Initialize objects one-by-one passing pointers with bounds of an object,
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not the full array of objects. */
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for (i = 0; i < size; i++)
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init_object (__builtin___bnd_narrow_ptr_bounds (objs + i, objs, sizeof(object)));
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@}
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@end smallexample
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_copy_ptr_bounds (const void * @var{q}, const void * @var{r})
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This built-in function returns a new pointer with the value of @var{q},
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and associate it with the bounds already associated with pointer @var{r}.
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With Pointer Bounds Checker off built-in function just returns the first
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argument.
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@smallexample
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/* Here is a way to get pointer to object's field but
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still with the full object's bounds. */
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int *field_ptr = __builtin___bnd_copy_ptr_bounds (&objptr->int_filed, objptr);
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@end smallexample
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_init_ptr_bounds (const void * @var{q})
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This built-in function returns a new pointer with the value of @var{q}, and
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associate it with INIT (allowing full memory access) bounds. With Pointer
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Bounds Checker off built-in function just returns the first argument.
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|
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_null_ptr_bounds (const void * @var{q})
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|
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This built-in function returns a new pointer with the value of @var{q}, and
|
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associate it with NULL (allowing no memory access) bounds. With Pointer
|
||||
Bounds Checker off built-in function just returns the first argument.
|
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@end deftypefn
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||||
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@deftypefn {Built-in Function} void __builtin___bnd_store_ptr_bounds (const void ** @var{ptr_addr}, const void * @var{ptr_val})
|
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This built-in function stores the bounds associated with pointer @var{ptr_val}
|
||||
and location @var{ptr_addr} into Bounds Table. This can be useful to propagate
|
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bounds from legacy code without touching the associated pointer's memory when
|
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pointers were copied as integers. With Pointer Bounds Checker off built-in
|
||||
function call is ignored.
|
||||
|
||||
@end deftypefn
|
||||
|
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_lbounds (const void * @var{q})
|
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|
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This built-in function checks if the pointer @var{q} is within the lower
|
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bound of its associated bounds. With Pointer Bounds Checker off built-in
|
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function call is ignored.
|
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|
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@smallexample
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extern void *__wrap_memset (void *dst, int c, size_t len)
|
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@{
|
||||
if (len > 0)
|
||||
@{
|
||||
__builtin___bnd_chk_ptr_lbounds (dst);
|
||||
__builtin___bnd_chk_ptr_ubounds ((char *)dst + len - 1);
|
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__real_memset (dst, c, len);
|
||||
@}
|
||||
return dst;
|
||||
@}
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||||
@end smallexample
|
||||
|
||||
@end deftypefn
|
||||
|
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_ubounds (const void * @var{q})
|
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|
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This built-in function checks if the pointer @var{q} is within the upper
|
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bound of its associated bounds. With Pointer Bounds Checker off built-in
|
||||
function call is ignored.
|
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|
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@end deftypefn
|
||||
|
||||
@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_bounds (const void * @var{q}, size_t @var{size})
|
||||
|
||||
This built-in function checks if [@var{q}, @var{q} + @var{size} - 1] is within
|
||||
the lower and upper bounds associated with @var{q}. With Pointer Bounds Checker
|
||||
off built-in function call is ignored.
|
||||
|
||||
@smallexample
|
||||
extern void *__wrap_memcpy (void *dst, const void *src, size_t n)
|
||||
@{
|
||||
if (n > 0)
|
||||
@{
|
||||
__bnd_chk_ptr_bounds (dst, n);
|
||||
__bnd_chk_ptr_bounds (src, n);
|
||||
__real_memcpy (dst, src, n);
|
||||
@}
|
||||
return dst;
|
||||
@}
|
||||
@end smallexample
|
||||
|
||||
@end deftypefn
|
||||
|
||||
@deftypefn {Built-in Function} const void * __builtin___bnd_get_ptr_lbound (const void * @var{q})
|
||||
|
||||
This built-in function returns the lower bound (which is a pointer) associated
|
||||
with the pointer @var{q}. This is at least useful for debugging using printf.
|
||||
With Pointer Bounds Checker off built-in function returns 0.
|
||||
|
||||
@smallexample
|
||||
void *lb = __builtin___bnd_get_ptr_lbound (q);
|
||||
void *ub = __builtin___bnd_get_ptr_ubound (q);
|
||||
printf ("q = %p lb(q) = %p ub(q) = %p", q, lb, ub);
|
||||
@end smallexample
|
||||
|
||||
@end deftypefn
|
||||
|
||||
@deftypefn {Built-in Function} const void * __builtin___bnd_get_ptr_ubound (const void * @var{q})
|
||||
|
||||
This built-in function returns the upper bound (which is a pointer) associated
|
||||
with the pointer @var{q}. With Pointer Bounds Checker off built-in function
|
||||
returns -1.
|
||||
|
||||
@end deftypefn
|
||||
|
||||
@node Other Builtins
|
||||
@section Other Built-in Functions Provided by GCC
|
||||
@cindex built-in functions
|
||||
|
|
|
|||
|
|
@ -1282,6 +1282,15 @@ process_options (void)
|
|||
"and -ftree-loop-linear)");
|
||||
#endif
|
||||
|
||||
if (flag_check_pointer_bounds)
|
||||
{
|
||||
if (targetm.chkp_bound_mode () == VOIDmode)
|
||||
error ("-fcheck-pointers is not supported for this target");
|
||||
|
||||
if (!lang_hooks.chkp_supported)
|
||||
flag_check_pointer_bounds = 0;
|
||||
}
|
||||
|
||||
/* One region RA really helps to decrease the code size. */
|
||||
if (flag_ira_region == IRA_REGION_AUTODETECT)
|
||||
flag_ira_region
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue