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Richard Stallman
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gcc/integrate.h
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119
gcc/integrate.h
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/* Function integration definitions for GNU C-Compiler
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Copyright (C) 1990 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This structure is used to remap objects in the function being inlined to
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those belonging to the calling function. It is passed by
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expand_inline_function to its children.
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This structure is also used when unrolling loops and otherwise
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replicating code, although not all fields are needed in this case;
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only those fields needed by copy_rtx_and_substitute() and its children
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are used.
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This structure is used instead of static variables because
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expand_inline_function may be called recursively via expand_expr. */
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struct inline_remap
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{
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/* Definition of function be inlined. */
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union tree_node *fndecl;
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/* Place to put insns needed at start of function. */
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rtx insns_at_start;
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/* Mapping from old registers to new registers.
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It is allocated and deallocated in `expand_inline_function' */
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rtx *reg_map;
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/* Mapping from old code-labels to new code-labels.
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The first element of this map is label_map[min_labelno]. */
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rtx *label_map;
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/* Mapping from old insn uid's to copied insns. The first element
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of this map is insn_map[min_insnno]; the last element is
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insn_map[max_insnno]. We keep the bounds here for when the map
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only covers a partial range of insns (such as loop unrolling or
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code replication). */
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rtx *insn_map;
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int min_insnno, max_insnno;
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/* Map pseudo reg number in calling function to equivalent constant. We
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cannot in general substitute constants into parameter pseudo registers,
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since some machine descriptions (many RISCs) won't always handle
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the resulting insns. So if an incoming parameter has a constant
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equivalent, we record it here, and if the resulting insn is
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recognizable, we go with it.
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We also use this mechanism to convert references to incoming arguments
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and stacked variables. copy_rtx_and_substitute will replace the virtual
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incoming argument and virtual stacked variables registers with new
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pseudos that contain pointers into the replacement area allocated for
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this inline instance. These pseudos are then marked as being equivalent
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to the appropriate address and substituted if valid. */
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rtx *const_equiv_map;
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/* This is incremented for each new basic block.
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It is used to store in const_age_map to record the domain of validity
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of each entry in const_equiv_map.
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A value of -1 indicates an entry for a reg which is a parm.
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All other values are "positive". */
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#define CONST_AGE_PARM (-1)
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unsigned int const_age;
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/* In parallel with const_equiv_map, record the valid age for each entry.
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The entry is invalid if its age is less than const_age. */
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unsigned int *const_age_map;
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/* Target of the inline function being expanded, or NULL if none. */
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rtx inline_target;
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/* When an insn is being copied by copy_rtx_and_substitute,
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this is nonzero if we have copied an ASM_OPERANDS.
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In that case, it is the original input-operand vector. */
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rtvec orig_asm_operands_vector;
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/* When an insn is being copied by copy_rtx_and_substitute,
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this is nonzero if we have copied an ASM_OPERANDS.
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In that case, it is the copied input-operand vector. */
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rtvec copy_asm_operands_vector;
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/* Likewise, this is the copied constraints vector. */
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rtvec copy_asm_constraints_vector;
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/* The next few fields are used for subst_constants to record the SETs
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that it saw. */
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int num_sets;
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struct equiv_table
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{
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rtx dest;
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rtx equiv;
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} equiv_sets[MAX_RECOG_OPERANDS];
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/* Record the last thing assigned to pc. This is used for folded
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conditional branch insns. */
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rtx last_pc_value;
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#ifdef HAVE_cc0
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/* Record the last thing assigned to cc0. */
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rtx last_cc0_value;
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#endif
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};
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/* Return a copy of an rtx (as needed), substituting pseudo-register,
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labels, and frame-pointer offsets as necessary. */
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extern rtx copy_rtx_and_substitute ();
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extern void try_constants ();
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extern void mark_stores ();
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/* We do some simple constant folding optimization. This optimization
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really exists primarily to save time inlining a function. It
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also helps users who ask for inline functions without -O. */
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extern rtx try_fold_condition ();
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extern rtx *global_const_equiv_map;
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