/* This file contains the definitions and documentation for the
tree codes used in GCC.
- Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004, 2005,
- 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004, 2005,
+ 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
This file is part of GCC.
that are variants made by type modifiers such as "const" and "volatile".
The TYPE_MAIN_VARIANT field, in any member of such a chain,
points to the start of the chain.
- The TYPE_NONCOPIED_PARTS field is a list specifying which parts
- of an object of this type should *not* be copied by assignment.
- The TREE_VALUE of each is a FIELD_DECL that should not be
- copied. The TREE_PURPOSE is an initial value for that field when
- an object of this type is initialized via an INIT_EXPR. It may
- be NULL if no special value is required. Even the things in this
- list are copied if the right-hand side of an assignment is known
- to be a complete object (rather than being, perhaps, a subobject
- of some other object.) The determination of what constitutes a
- complete object is done by fixed_type_p.
The TYPE_NAME field contains info on the name used in the program
for this type (for GDB symbol table output). It is either a
TYPE_DECL node, for types that are typedefs, or an IDENTIFIER_NODE
macros in tree.h. Changing the order will degrade the speed of the
compiler. OFFSET_TYPE, ENUMERAL_TYPE, BOOLEAN_TYPE, INTEGER_TYPE,
REAL_TYPE, POINTER_TYPE. */
-
+
/* An offset is a pointer relative to an object.
The TREE_TYPE field is the type of the object at the offset.
The TYPE_OFFSET_BASETYPE points to the node for the type of object
macros in tree.h. Changing the order will degrade the speed of the
compiler. POINTER_TYPE, REFERENCE_TYPE. Note that this range
overlaps the previous range of ordered types. */
-
+
/* All pointer-to-x types have code POINTER_TYPE.
The TREE_TYPE points to the node for the type pointed to. */
DEFTREECODE (POINTER_TYPE, "pointer_type", tcc_type, 0)
+/* A reference is like a pointer except that it is coerced
+ automatically to the value it points to. Used in C++. */
+DEFTREECODE (REFERENCE_TYPE, "reference_type", tcc_type, 0)
+
+/* The C++ decltype(nullptr) type. */
+DEFTREECODE (NULLPTR_TYPE, "nullptr_type", tcc_type, 0)
+
/* _Fract and _Accum types in Embedded-C. Different fixed-point types
are distinguished by machine mode and by the TYPE_SIZE and the
TYPE_PRECISION. */
DEFTREECODE (FIXED_POINT_TYPE, "fixed_point_type", tcc_type, 0)
-/* A reference is like a pointer except that it is coerced
- automatically to the value it points to. Used in C++. */
-DEFTREECODE (REFERENCE_TYPE, "reference_type", tcc_type, 0)
-
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. COMPLEX_TYPE, VECTOR_TYPE, ARRAY_TYPE. */
-
+
/* Complex number types. The TREE_TYPE field is the data type
of the real and imaginary parts. It must be of scalar
arithmetic type, not including pointer type. */
macros in tree.h. Changing the order will degrade the speed of the
compiler. ARRAY_TYPE, RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE.
Note that this range overlaps the previous range. */
-
+
/* Types of arrays. Special fields:
TREE_TYPE Type of an array element.
TYPE_DOMAIN Type to index by.
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. VOID_TYPE, FUNCTION_TYPE, METHOD_TYPE. */
-
+
/* The void type in C */
DEFTREECODE (VOID_TYPE, "void_type", tcc_type, 0)
DEFTREECODE (TYPE_DECL, "type_decl", tcc_declaration, 0)
DEFTREECODE (RESULT_DECL, "result_decl", tcc_declaration, 0)
+/* A "declaration" of a debug temporary. It should only appear in
+ DEBUG stmts. */
+DEFTREECODE (DEBUG_EXPR_DECL, "debug_expr_decl", tcc_declaration, 0)
+
/* A namespace declaration. Namespaces appear in DECL_CONTEXT of other
_DECLs, providing a hierarchy of names. */
DEFTREECODE (NAMESPACE_DECL, "namespace_decl", tcc_declaration, 0)
of the range is taken from the type of the expression. */
DEFTREECODE (ARRAY_RANGE_REF, "array_range_ref", tcc_reference, 4)
-/* The ordering of the following codes is optimized for the checking
- macros in tree.h. Changing the order will degrade the speed of the
- compiler. INDIRECT_REF, ALIGN_INDIRECT_REF, MISALIGNED_INDIRECT_REF. */
-
/* C unary `*' or Pascal `^'. One operand, an expression for a pointer. */
DEFTREECODE (INDIRECT_REF, "indirect_ref", tcc_reference, 1)
-/* Like above, but aligns the referenced address (i.e, if the address
- in P is not aligned on TYPE_ALIGN boundary, then &(*P) != P). */
-DEFTREECODE (ALIGN_INDIRECT_REF, "align_indirect_ref", tcc_reference, 1)
-
-/* Same as INDIRECT_REF, but also specifies the alignment of the referenced
- address:
- Operand 0 is the referenced address (a pointer);
- Operand 1 is an INTEGER_CST which represents the alignment of the address,
- or 0 if the alignment is unknown. */
-DEFTREECODE (MISALIGNED_INDIRECT_REF, "misaligned_indirect_ref", tcc_reference, 2)
-
-/* Used to represent lookup of runtime type dependent data. Often this is
- a reference to a vtable, but it needn't be. Operands are:
+/* Used to represent lookup in a virtual method table which is dependent on
+ the runtime type of an object. Operands are:
OBJ_TYPE_REF_EXPR: An expression that evaluates the value to use.
OBJ_TYPE_REF_OBJECT: Is the object on whose behalf the lookup is
being performed. Through this the optimizers may be able to statically
determine the dynamic type of the object.
- OBJ_TYPE_REF_TOKEN: Something front-end specific used to resolve the
- reference to something simpler, usually to the address of a DECL.
- Never touched by the middle-end. Good choices would be either an
- identifier or a vtable index. */
+ OBJ_TYPE_REF_TOKEN: An integer index to the virtual method table. */
DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3)
-/* The exception object from the runtime. */
-DEFTREECODE (EXC_PTR_EXPR, "exc_ptr_expr", tcc_expression, 0)
-
-/* The filter object from the runtime. */
-DEFTREECODE (FILTER_EXPR, "filter_expr", tcc_expression, 0)
-
/* Constructor: return an aggregate value made from specified components.
In C, this is used only for structure and array initializers.
The operand is a sequence of component values made out of a VEC of
Operand 1 must have the same type as the entire expression, unless
it unconditionally throws an exception, in which case it should
have VOID_TYPE. The same constraints apply to operand 2. The
- condition in operand 0 must be of integral type.
+ condition in operand 0 must be of integral type.
In cfg gimple, if you do not have a selection expression, operands
1 and 2 are NULL. The operands are then taken from the cfg edges. */
*/
DEFTREECODE (VEC_COND_EXPR, "vec_cond_expr", tcc_expression, 3)
+/* Vector permutation expression. A = VEC_PERM_EXPR<v0, v1, mask> means
+
+ N = length(mask)
+ foreach i in N:
+ M = mask[i] % (2*N)
+ A = M < N ? v0[M] : v1[M-N]
+
+ V0 and V1 are vectors of the same type. MASK is an integer-typed
+ vector. The number of MASK elements must be the same with the
+ number of elements in V0 and V1. The size of the inner type
+ of the MASK and of the V0 and V1 must be the same.
+*/
+DEFTREECODE (VEC_PERM_EXPR, "vec_perm_expr", tcc_expression, 3)
+
/* Declare local variables, including making RTL and allocating space.
BIND_EXPR_VARS is a chain of VAR_DECL nodes for the variables.
BIND_EXPR_BODY is the body, the expression to be computed using
BLKmode, because it will not be forced out of memory. */
DEFTREECODE (CLEANUP_POINT_EXPR, "cleanup_point_expr", tcc_expression, 1)
-/* The following two codes are used in languages that have types where
- some field in an object of the type contains a value that is used in
- the computation of another field's offset or size and/or the size of
- the type. The positions and/or sizes of fields can vary from object
- to object of the same type or even for one and the same object within
+/* The following code is used in languages that have types where some
+ field in an object of the type contains a value that is used in the
+ computation of another field's offset or size and/or the size of the
+ type. The positions and/or sizes of fields can vary from object to
+ object of the same type or even for one and the same object within
its scope.
Record types with discriminants in Ada or schema types in Pascal are
The others are allowed only for integer (or pointer or enumeral)
or real types.
In all cases the operands will have the same type,
- and the value is always the type used by the language for booleans. */
+ and the value is either the type used by the language for booleans
+ or an integer vector type of the same size and with the same number
+ of elements as the comparison operands. True for a vector of
+ comparison results has all bits set while false is equal to zero. */
DEFTREECODE (LT_EXPR, "lt_expr", tcc_comparison, 2)
DEFTREECODE (LE_EXPR, "le_expr", tcc_comparison, 2)
DEFTREECODE (GT_EXPR, "gt_expr", tcc_comparison, 2)
represented by CONVERT_EXPR or NOP_EXPR nodes. */
DEFTREECODE (CONVERT_EXPR, "convert_expr", tcc_unary, 1)
+/* Conversion of a pointer value to a pointer to a different
+ address space. */
+DEFTREECODE (ADDR_SPACE_CONVERT_EXPR, "addr_space_convert_expr", tcc_unary, 1)
+
/* Conversion of a fixed-point value to an integer, a real, or a fixed-point
value. Or conversion of a fixed-point value from an integer, a real, or
a fixed-point value. */
CASE_HIGH, respectively. If CASE_LOW is NULL_TREE, the label is a
'default' label. If CASE_HIGH is NULL_TREE, the label is a normal case
label. CASE_LABEL is the corresponding LABEL_DECL. */
-DEFTREECODE (CASE_LABEL_EXPR, "case_label_expr", tcc_statement, 3)
-
-/* RESX. Resume execution after an exception. Operand 0 is a
- number indicating the exception region that is being left. */
-DEFTREECODE (RESX_EXPR, "resx_expr", tcc_statement, 1)
+DEFTREECODE (CASE_LABEL_EXPR, "case_label_expr", tcc_statement, 4)
/* Used to represent an inline assembly statement. ASM_STRING returns a
STRING_CST for the instruction (e.g., "mov x, y"). ASM_OUTPUTS,
ASM_INPUTS, and ASM_CLOBBERS represent the outputs, inputs, and clobbers
- for the statement. */
-DEFTREECODE (ASM_EXPR, "asm_expr", tcc_statement, 4)
+ for the statement. ASM_LABELS, if present, indicates various destinations
+ for the asm; labels cannot be combined with outputs. */
+DEFTREECODE (ASM_EXPR, "asm_expr", tcc_statement, 5)
/* Variable references for SSA analysis. New SSA names are created every
time a variable is assigned a new value. The SSA builder uses SSA_NAME
/* Used to represent an exception specification. EH_FILTER_TYPES is a list
of allowed types, and EH_FILTER_FAILURE is an expression to evaluate on
- failure. EH_FILTER_MUST_NOT_THROW controls which range type to use when
- expanding. */
+ failure. */
DEFTREECODE (EH_FILTER_EXPR, "eh_filter_expr", tcc_statement, 2)
-/* Indicates a change in the dynamic type of a memory location. This
- has no value and generates no executable code. It is only used for
- type based alias analysis. This is generated by C++ placement new.
- CHANGE_DYNAMIC_TYPE_NEW_TYPE, the first operand, is the new type.
- CHANGE_DYNAMIC_TYPE_LOCATION, the second operand, is the location
- whose type is being changed. */
-DEFTREECODE (CHANGE_DYNAMIC_TYPE_EXPR, "change_dynamic_type_expr",
- tcc_statement, 2)
-
/* Node used for describing a property that is known at compile
time. */
DEFTREECODE (SCEV_KNOWN, "scev_known", tcc_expression, 0)
/* Predicate assertion. Artificial expression generated by the optimizers
to keep track of predicate values. This expression may only appear on
the RHS of assignments.
-
+
Given X = ASSERT_EXPR <Y, EXPR>, the optimizers can infer
two things:
If OFF > 0, the last VS - OFF elements of vector OP0 are concatenated to
the first OFF elements of the vector OP1.
If OFF == 0, then the returned vector is OP1.
- On different targets OFF may take different forms; It can be an address, in
- which case its low log2(VS)-1 bits define the offset, or it can be a mask
+ On different targets OFF may take different forms; It can be an address, in
+ which case its low log2(VS)-1 bits define the offset, or it can be a mask
generated by the builtin targetm.vectorize.mask_for_load_builtin_decl. */
DEFTREECODE (REALIGN_LOAD_EXPR, "realign_load", tcc_expression, 3)
-/* Low-level memory addressing. Operands are SYMBOL (static or global
- variable), BASE (register), INDEX (register), STEP (integer constant),
- OFFSET (integer constant). Corresponding address is
- SYMBOL + BASE + STEP * INDEX + OFFSET. Only variations and values valid on
- the target are allowed.
+/* Low-level memory addressing. Operands are BASE (address of static or
+ global variable or register), OFFSET (integer constant),
+ INDEX (register), STEP (integer constant), INDEX2 (register),
+ The corresponding address is BASE + STEP * INDEX + INDEX2 + OFFSET.
+ Only variations and values valid on the target are allowed.
- The type of STEP, INDEX and OFFSET is sizetype. The type of BASE is
- sizetype or a pointer type (if SYMBOL is NULL).
-
- The sixth argument is the reference to the original memory access, which
- is preserved for the purposes of the RTL alias analysis. */
+ The type of STEP, INDEX and INDEX2 is sizetype.
-DEFTREECODE (TARGET_MEM_REF, "target_mem_ref", tcc_reference, 6)
+ The type of BASE is a pointer type. If BASE is not an address of
+ a static or global variable INDEX2 will be NULL.
+
+ The type of OFFSET is a pointer type and determines TBAA the same as
+ the constant offset operand in MEM_REF. */
+
+DEFTREECODE (TARGET_MEM_REF, "target_mem_ref", tcc_reference, 5)
+
+/* Memory addressing. Operands are a pointer and a tree constant integer
+ byte offset of the pointer type that when dereferenced yields the
+ type of the base object the pointer points into and which is used for
+ TBAA purposes.
+ The type of the MEM_REF is the type the bytes at the memory location
+ are interpreted as.
+ MEM_REF <p, c> is equivalent to ((typeof(c))p)->x... where x... is a
+ chain of component references offsetting p by c. */
+DEFTREECODE (MEM_REF, "mem_ref", tcc_reference, 2)
/* The ordering of the codes between OMP_PARALLEL and OMP_CRITICAL is
exposed to TREE_RANGE_CHECK. */
build_fold_indirect_ref of the address. */
DEFTREECODE (OMP_ATOMIC, "omp_atomic", tcc_statement, 2)
+/* OpenMP - #pragma omp atomic read
+ Operand 0: The address at which the atomic operation is to be performed.
+ This address should be stabilized with save_expr. */
+DEFTREECODE (OMP_ATOMIC_READ, "omp_atomic_read", tcc_statement, 1)
+
+/* OpenMP - #pragma omp atomic capture
+ Operand 0: The address at which the atomic operation is to be performed.
+ This address should be stabilized with save_expr.
+ Operand 1: The expression to evaluate. When the old value of the object
+ at the address is used in the expression, it should appear as if
+ build_fold_indirect_ref of the address.
+ OMP_ATOMIC_CAPTURE_OLD returns the old memory content,
+ OMP_ATOMIC_CAPTURE_NEW the new value. */
+DEFTREECODE (OMP_ATOMIC_CAPTURE_OLD, "omp_atomic_capture_old", tcc_statement, 2)
+DEFTREECODE (OMP_ATOMIC_CAPTURE_NEW, "omp_atomic_capture_new", tcc_statement, 2)
+
/* OpenMP clauses. */
DEFTREECODE (OMP_CLAUSE, "omp_clause", tcc_exceptional, 0)
-/* Reduction operations.
+/* TRANSACTION_EXPR tree code.
+ Operand 0: BODY: contains body of the transaction. */
+DEFTREECODE (TRANSACTION_EXPR, "transaction_expr", tcc_expression, 1)
+
+/* Reduction operations.
Operations that take a vector of elements and "reduce" it to a scalar
result (e.g. summing the elements of the vector, finding the minimum over
the vector elements, etc).
Operand 0 is a vector; the first element in the vector has the result.
- Operand 1 is a vector. */
+ Operand 1 is a vector. */
DEFTREECODE (REDUC_MAX_EXPR, "reduc_max_expr", tcc_unary, 1)
DEFTREECODE (REDUC_MIN_EXPR, "reduc_min_expr", tcc_unary, 1)
DEFTREECODE (REDUC_PLUS_EXPR, "reduc_plus_expr", tcc_unary, 1)
twice the size of t1. DOT_PROD_EXPR(arg1,arg2,arg3) is equivalent to:
tmp = WIDEN_MULT_EXPR(arg1, arg2);
arg3 = PLUS_EXPR (tmp, arg3);
- or:
+ or:
tmp = WIDEN_MULT_EXPR(arg1, arg2);
arg3 = WIDEN_SUM_EXPR (tmp, arg3); */
DEFTREECODE (DOT_PROD_EXPR, "dot_prod_expr", tcc_expression, 3)
the first argument from type t1 to type t2, and then summing it
with the second argument. */
DEFTREECODE (WIDEN_SUM_EXPR, "widen_sum_expr", tcc_binary, 2)
-
+
/* Widening multiplication.
The two arguments are of type t1.
The result is of type t2, such that t2 is at least twice
the arguments from type t1 to type t2, and then multiplying them. */
DEFTREECODE (WIDEN_MULT_EXPR, "widen_mult_expr", tcc_binary, 2)
+/* Widening multiply-accumulate.
+ The first two arguments are of type t1.
+ The third argument and the result are of type t2, such as t2 is at least
+ twice the size of t1. t1 and t2 must be integral or fixed-point types.
+ The expression is equivalent to a WIDEN_MULT_EXPR operation
+ of the first two operands followed by an add or subtract of the third
+ operand. */
+DEFTREECODE (WIDEN_MULT_PLUS_EXPR, "widen_mult_plus_expr", tcc_expression, 3)
+/* This is like the above, except in the final expression the multiply result
+ is subtracted from t3. */
+DEFTREECODE (WIDEN_MULT_MINUS_EXPR, "widen_mult_minus_expr", tcc_expression, 3)
+
+/* Widening shift left.
+ The first operand is of type t1.
+ The second operand is the number of bits to shift by; it need not be the
+ same type as the first operand and result.
+ Note that the result is undefined if the second operand is larger
+ than or equal to the first operand's type size.
+ The type of the entire expression is t2, such that t2 is at least twice
+ the size of t1.
+ WIDEN_LSHIFT_EXPR is equivalent to first widening (promoting)
+ the first argument from type t1 to type t2, and then shifting it
+ by the second argument. */
+DEFTREECODE (WIDEN_LSHIFT_EXPR, "widen_lshift_expr", tcc_binary, 2)
+
+/* Fused multiply-add.
+ All operands and the result are of the same type. No intermediate
+ rounding is performed after multiplying operand one with operand two
+ before adding operand three. */
+DEFTREECODE (FMA_EXPR, "fma_expr", tcc_expression, 3)
+
/* Whole vector left/right shift in bits.
Operand 0 is a vector to be shifted.
Operand 1 is an integer shift amount in bits. */
the output vector. */
DEFTREECODE (VEC_PACK_FIX_TRUNC_EXPR, "vec_pack_fix_trunc_expr", tcc_binary, 2)
-/* Extract even/odd fields from vectors. */
-DEFTREECODE (VEC_EXTRACT_EVEN_EXPR, "vec_extracteven_expr", tcc_binary, 2)
-DEFTREECODE (VEC_EXTRACT_ODD_EXPR, "vec_extractodd_expr", tcc_binary, 2)
-
-/* Merge input vectors interleaving their fields. */
-DEFTREECODE (VEC_INTERLEAVE_HIGH_EXPR, "vec_interleavehigh_expr", tcc_binary, 2)
-DEFTREECODE (VEC_INTERLEAVE_LOW_EXPR, "vec_interleavelow_expr", tcc_binary, 2)
+/* Widening vector shift left in bits.
+ Operand 0 is a vector to be shifted with N elements of size S.
+ Operand 1 is an integer shift amount in bits.
+ The result of the operation is N elements of size 2*S.
+ VEC_WIDEN_LSHIFT_HI_EXPR computes the N/2 high results.
+ VEC_WIDEN_LSHIFT_LO_EXPR computes the N/2 low results.
+ */
+DEFTREECODE (VEC_WIDEN_LSHIFT_HI_EXPR, "widen_lshift_hi_expr", tcc_binary, 2)
+DEFTREECODE (VEC_WIDEN_LSHIFT_LO_EXPR, "widen_lshift_lo_expr", tcc_binary, 2)
/* PREDICT_EXPR. Specify hint for branch prediction. The
PREDICT_EXPR_PREDICTOR specify predictor and PREDICT_EXPR_OUTCOME the
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