X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firgmod.c;h=d7f9705cdd05a0430eda93eb3f77aaf040a97481;hb=a947c2090825c6a49b3fbfaafc00c8c34d649a40;hp=fde51ce975403cbb821b2bbaf383a9b280cacb09;hpb=efbeaff549fcc6015da255ed4d453a95937ff0fd;p=libfirm diff --git a/ir/ir/irgmod.c b/ir/ir/irgmod.c index fde51ce97..d7f9705cd 100644 --- a/ir/ir/irgmod.c +++ b/ir/ir/irgmod.c @@ -1,306 +1,316 @@ -/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe -** All rights reserved. -** -** Authors: Martin Trapp, Christian Schaefer -** -** irgmod: ir graph modification -*/ - -# include "irgmod.h" -# include "iropt.h" - -/* ir_node * */ -/* arg_access (ir_mode *mode, long proj) */ -/* { */ -/* return new_r_Proj (current_ir_graph, current_ir_graph->start, */ -/* current_ir_graph->args, mode, proj); */ -/* } */ - - -/* these two functions are used in phi_merge, but defined in ircons.c */ -inline ir_node * get_r_value_internal (ir_node *block, - int pos, ir_mode *mode); -inline ir_node * new_r_Phi_in (ir_graph *irg, ir_node *block, ir_mode *mode, - ir_node **in, int ins); - -/** This function computes the predecessors for a real Phi node, and then - allocates and returns this node. The routine called to allocate the - node might optimize it away and return a real value, or even a pointer - to a deallocated Phi node on top of the obstack! - This function is called with an in-array of proper size. **/ -static inline ir_node * -phi_merge (ir_node *block, int pos, ir_mode *mode, ir_node **nin, int ins) -{ - ir_node *prevBlock, *res; - int i; - - /* This loop goes to all predecessor blocks of the block the Phi node is in - and there finds the operands of the Phi node by calling get_r_value_internal. */ - for (i = 1; i <= ins; ++i) { - assert (block->in[i]); - prevBlock = block->in[i]->in[0]; /* go past control flow op to prev block */ - assert (prevBlock); - nin[i-1] = get_r_value_internal (prevBlock, pos, mode); - } - - /* After collecting all predecessors into the array nin a new Phi node - with these predecessors is created. This constructor contains an - optimization: If all predecessors of the Phi node are identical it - returns the only operand instead of a new Phi node. If the value - passes two different control flow edges without being defined, and - this is the second path treated, a pointer to the node that will be - allocated for the first path (recurstion) is returned. We already - know the address of this node, as it is the next node to be allocated - and will be placed on top of the obstack. (The obstack is a _stack_!) */ - res = new_r_Phi_in (current_ir_graph, block, mode, nin, ins); - - /* Now we now the value "pos" and can enter it in the array with - all known local variables. Attention: this might be a pointer to - a node, that later will be allocated!!! See new_r_Phi_in. - If this is called in mature, after some set_value in the same block, - the proper value must not be overwritten: - The call order - get_value (makes Phi0, put's it into graph_arr) - set_value (overwrites Phi0 in graph_arr) - mature_block (upgrades Phi0, puts it again into graph_arr, overwriting - the proper value.) - fails. */ - if (!block->attr.block.graph_arr[pos]) { - block->attr.block.graph_arr[pos] = res; - } else { - // printf(" value already computed by %s\n", - // id_to_str(block->attr.block.graph_arr[pos]->op->name)); - } - - return res; +/* + * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. + * + * This file is part of libFirm. + * + * This file may be distributed and/or modified under the terms of the + * GNU General Public License version 2 as published by the Free Software + * Foundation and appearing in the file LICENSE.GPL included in the + * packaging of this file. + * + * Licensees holding valid libFirm Professional Edition licenses may use + * this file in accordance with the libFirm Commercial License. + * Agreement provided with the Software. + * + * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE + * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE. + */ + +/** + * @file + * @brief Support for ir graph modification. + * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier + * @version $Id$ + */ +#include "config.h" + +#include "irvrfy.h" +#include "irflag_t.h" +#include "irgwalk.h" +#include "irnode_t.h" +#include "irgraph_t.h" +#include "irgmod.h" +#include "array.h" +#include "ircons.h" +#include "irhooks.h" +#include "iredges_t.h" +#include "irtools.h" +#include "error.h" + +/** + * Turns a node into a "useless" Tuple. The Tuple just forms a tuple + * from several inputs. + * This is useful if a node returning a tuple is removed, but the Projs + * extracting values from the tuple are not available. + */ +void turn_into_tuple(ir_node *node, int arity) { + assert(node); + set_irn_op(node, op_Tuple); + if (get_irn_arity(node) == arity) { + /* keep old array */ + } else { + ir_graph *irg = get_irn_irg(node); + ir_node *block = get_nodes_block(node); + edges_node_deleted(node, irg); + /* Allocate new array, don't free old in_array, it's on the obstack. */ + node->in = NEW_ARR_D(ir_node *, irg->obst, arity+1); + /* clear the new in array, else edge_notify tries to delete garbage */ + memset(node->in, 0, (arity+1) * sizeof(node->in[0])); + /* set the block back */ + set_nodes_block(node, block); + } } - -/* this function is used in get_r_value_internal, but defined in ircons.c */ -inline ir_node * new_r_Phi0 (ir_graph *irg, ir_node *block, ir_mode *mode); - - -/* This function returns the last definition of a variable. In case - this variable was last defined in a previous block, Phi nodes are - inserted. If the part of the firm graph containing the definition - is not yet constructed, a dummy Phi node is returned. */ -inline ir_node * -get_r_value_internal (ir_node *block, int pos, ir_mode *mode) -{ - ir_node *res; - /* There are 4 cases to treat. - - 1. The block is not mature and we visit it the first time. We can not - create a proper Phi node, therefore a Phi0, i.e., a Phi without - predecessors is returned. This node is added to the linked list (field - "link") of the containing block to be completed when this block is - matured. (Comlpletion will add a new Phi and turn the Phi0 into a Id - node.) - - 2. The value is already known in this block, graph_arr[pos] is set and we - visit the block the first time. We can return the value without - creating any new nodes. - - 3. The block is mature and we visit it the first time. A Phi node needs - to be created (phi_merge). If the Phi is not needed, as all it's - operands are the same value reaching the block through different - paths, it's optimizes away and the value itself is returned. - - 4. The block is mature, and we visit it the second time. Now two - subcases are possible: - * The value was computed completely the last time we were here. - This is the case if there is no loop. We can return the proper value. - * The recursion that visited this node and set the flag did not - return yet. We are computing a value in a loop and need to - break the recursion without knowing the result yet. - There is no simple check for the second subcase. Therefore we check - for a second visit and treat all such cases as the second subcase. - Anyways, the basic situation is the same: we reached a block - on two paths without finding a definition of the value: No Phi - nodes are needed on both paths. - We return this information "Two paths, no Phi needed" by a very tricky - implementation that relies on the fact that an obstack is a stack and - will return a node with the same address on different allocations. - Look also at phi_merge and get_r_phi_in to understand this. - */ - - /* case 4 -- already visited. */ - if (block->visit == ir_visited) return NULL; - - /* visited the first time */ - block->visit = ir_visited; - - /* Get the local valid value */ - res = block->attr.block.graph_arr[pos]; - - /* case 2 -- If the value is actually computed, return it. */ - if (res) { return res;}; - - if (block->attr.block.matured) { /* case 3 */ - - /* The Phi has the same amount of ins as the corresponding block. */ - int ins = get_irn_arity(block); // ARR_LEN (block->in)-1; - ir_node **nin; - NEW_ARR_A (ir_node *, nin, ins); - - /* Phi merge collects the predecessors and then creates a node. */ - res = phi_merge (block, pos, mode, nin, ins); - - } else { /* case 1 */ - /* The block is not mature, we don't know how many in's are needed. A Phi - with zero predecessors is created. Such a Phi node is called Phi0 - node. (There is also an obsolete Phi0 opcode.) The Phi0 is then added - to the list of Phi0 nodes in this block to be matured by mature_block - later. - The Phi0 has to remember the pos of it's internal value. If the real Phi - is computed, pos is used to update the array with the local values. */ - - res = new_r_Phi0 (current_ir_graph, block, mode); - res->attr.phi0_pos = pos; - res->link = block->link; - block->link = res; - } - - /* If we get here, the frontend missed a use-before-definition error */ - if (!res) { - /* Error Message */ - printf("Error: no value set\n"); - assert (mode->code >= irm_f && mode->code <= irm_p); - res = new_r_Const (current_ir_graph, block, mode, - tarval_mode_null[mode->code]); - } - - /* The local valid value is available now. */ - block->attr.block.graph_arr[pos] = res; - - return res; +/** + * Insert irnode `new' in place of irnode `old' + * Since `new' may be bigger than `old' replace `old' + * by an op_Id which is smaller than everything. + */ +void exchange(ir_node *old, ir_node *nw) { + ir_graph *irg; + + assert(old && nw); + assert(old != nw && "Exchanging node with itself is not allowed"); + + irg = get_irn_irg(old); + assert(irg == get_irn_irg(nw) && "New node must be in same irg as old node"); + + hook_replace(old, nw); + + /* + * If new outs are on, we can skip the id node creation and reroute + * the edges from the old node to the new directly. + */ + if (edges_activated(irg)) { + /* copy all dependencies from old to new */ + add_irn_deps(nw, old); + + edges_reroute(old, nw, irg); + edges_reroute_kind(old, nw, EDGE_KIND_DEP, irg); + edges_node_deleted(old, irg); + old->op = op_Bad; + } else { + /* Else, do it the old-fashioned way. */ + ir_node *block; + + hook_turn_into_id(old); + + block = old->in[0]; + if (! block) { + block = is_Block(nw) ? nw : get_nodes_block(nw); + + if (! block) { + panic("cannot find legal block for id"); + } + } + + if (get_irn_op(old)->opar == oparity_dynamic) { + DEL_ARR_F(get_irn_in(old)); + } + + old->op = op_Id; + old->in = NEW_ARR_D (ir_node *, irg->obst, 2); + old->in[0] = block; + old->in[1] = nw; + } } - -/* add an adge to a jmp node */ -void -add_in_edge (ir_node *block, ir_node *jmp) -{ - if (block->attr.block.matured) { - printf("Error: Block already matured!\n"); - } - else { - assert (jmp != NULL); - ARR_APP1 (ir_node *, block->in, jmp); - } +/*--------------------------------------------------------------------*/ +/* Functionality for collect_phis */ +/*--------------------------------------------------------------------*/ + +/** + * Walker: links all Phi nodes to their Blocks lists, + * all Proj nodes to there predecessors and all + * partBlocks to there MacroBlock header. + */ +static void collect_phiprojs_walker(ir_node *n, void *env) { + ir_node *pred; + (void) env; + + if (is_Phi(n)) { + ir_node *block = get_nodes_block(n); + add_Block_phi(block, n); + } else if (is_Proj(n)) { + pred = n; + do { + pred = get_Proj_pred(pred); + } while (is_Proj(pred)); + + set_irn_link(n, get_irn_link(pred)); + set_irn_link(pred, n); + } else if (is_Block(n)) { + ir_node *mbh = get_Block_MacroBlock(n); + + if (mbh != n) { + set_irn_link(n, get_irn_link(mbh)); + set_irn_link(mbh, n); + } + } } - -/****************************/ -/* parameter administration */ - -/* get a value from the parameter array from the current block by its index */ -ir_node * -get_value (int pos, ir_mode *mode) -{ - ++ir_visited; - return get_r_value_internal (current_ir_graph->current_block, pos + 1, mode); -} - - -/* set a value at position pos in the parameter array from the current block */ -inline void -set_value (int pos, ir_node *value) -{ - current_ir_graph->current_block->attr.block.graph_arr[pos + 1] = value; +void collect_phiprojs(ir_graph *irg) { + assert((ir_resources_reserved(irg) & (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST)) == + (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST)); + irg_walk_graph(irg, firm_clear_node_and_phi_links, collect_phiprojs_walker, NULL); } - -/* get the current store */ -inline ir_node * -get_store (void) -{ - /* GL: one could call get_value instead */ - ++ir_visited; - return get_r_value_internal (current_ir_graph->current_block, 0, mode_M); +/*--------------------------------------------------------------------*/ +/* Functionality for part_block */ +/*--------------------------------------------------------------------*/ + +/** + * Moves node and all predecessors of node from from_bl to to_bl. + * Does not move predecessors of Phi nodes (or block nodes). + */ +static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl) { + int i, arity; + + /* move this node */ + set_nodes_block(node, to_bl); + + /* move its Projs */ + if (get_irn_mode(node) == mode_T) { + ir_node *proj = get_irn_link(node); + while (proj) { + if (get_nodes_block(proj) == from_bl) + set_nodes_block(proj, to_bl); + proj = get_irn_link(proj); + } + } + + /* recursion ... */ + if (is_Phi(node)) + return; + + arity = get_irn_arity(node); + for (i = 0; i < arity; i++) { + ir_node *pred = get_irn_n(node, i); + if (get_nodes_block(pred) == from_bl) + move(pred, from_bl, to_bl); + } } - -/* set the current store */ -inline void -set_store (ir_node *store) -{ - /* GL: one could call set_value instead */ - current_ir_graph->current_block->attr.block.graph_arr[0] = store; +void part_block(ir_node *node) { + ir_node *new_block; + ir_node *old_block; + ir_node *phi; + ir_node *mbh; + ir_node *next, *block; + + /* Turn off optimizations so that blocks are not merged again. */ + int rem_opt = get_opt_optimize(); + set_optimize(0); + + /* Transform the control flow */ + old_block = get_nodes_block(node); + mbh = get_Block_MacroBlock(old_block); + new_block = new_Block(get_Block_n_cfgpreds(old_block), + get_Block_cfgpred_arr(old_block)); + + if (mbh != old_block) { + /* we splitting a partBlock */ + set_Block_MacroBlock(new_block, mbh); + } else { + /* we are splitting a header: this creates a new header */ + set_Block_MacroBlock(new_block, new_block); + } + set_irg_current_block(current_ir_graph, new_block); + { + ir_node *jmp = new_Jmp(); + set_irn_in(old_block, 1, &jmp); + irn_vrfy_irg(old_block, current_ir_graph); + } + + /* move node and its predecessors to new_block */ + move(node, old_block, new_block); + + /* move Phi nodes to new_block */ + phi = get_Block_phis(old_block); + set_Block_phis(new_block, phi); + set_Block_phis(old_block, NULL); + while (phi) { + set_nodes_block(phi, new_block); + phi = get_Phi_next(phi); + } + + /* rewire partBlocks */ + if (mbh != old_block) { + ir_node *list = NULL; + + /* move blocks from mbh to old_block if old_block dominates them */ + block = get_irn_link(mbh); + + set_irn_link(mbh, NULL); + set_Block_MacroBlock(old_block, old_block); + + /* note that we must splice the list of partBlock here */ + for (; block != NULL; block = next) { + ir_node *curr = block; + assert(is_Block(curr)); + + next = get_irn_link(block); + + if (block == old_block) + continue; + + assert(get_Block_MacroBlock(curr) == mbh); + + for (;;) { + if (curr == old_block) { + /* old_block dominates the block, so old_block will be + the new macro block header */ + set_Block_MacroBlock(block, old_block); + set_irn_link(block, list); + list = block; + break; + } + if (curr == mbh) { + /* leave it in the mbh */ + set_irn_link(block, get_irn_link(mbh)); + set_irn_link(mbh, block); + break; + } + + assert(get_Block_n_cfgpreds(curr) == 1); + curr = get_Block_cfgpred_block(curr, 0); + } + } + /* beware: do NOT directly manipulate old_block's list, as old_block is + in mbh's list and this would destroy the list! */ + set_irn_link(old_block, list); + + /* finally add new_block to mbh's list */ + set_irn_link(new_block, get_irn_link(mbh)); + set_irn_link(mbh, new_block); + } else { + /* move blocks from mbh to new_block */ + block = get_irn_link(mbh); + + set_irn_link(mbh, NULL); + set_irn_link(new_block, NULL); + + for (; block != NULL; block = next) { + next = get_irn_link(block); + + set_Block_MacroBlock(block, new_block); + set_irn_link(block, get_irn_link(new_block)); + set_irn_link(new_block, block); + } + } + + set_optimize(rem_opt); } -/** Finalize a Block node, when all control flows are known. */ -/** Acceptable parameters are only Block nodes. */ -void -mature_block (ir_node *block) -{ - - int ins; - ir_node *n, **nin; - ir_node *next; - - assert (get_irn_opcode(block) == iro_Block); - - if (!get_Block_matured(block)) { - - /* turn the dynamic in-array into a static one. */ - ins = ARR_LEN (block->in)-1; - NEW_ARR_A (ir_node *, nin, ins); - - /* GL, 7.2.2000. seems to be not complete. added this: but does'nt work.* - memcpy (nin, block->in, sizeof (ir_node *) * ins); - block->in = nin; - */ - - /* Traverse a chain of Phi nodes attached to this block and mature these, too. **/ - for (n = block->link; n; n=next) { - ir_visited++; - next = n->link; - exchange (n, phi_merge (block, n->attr.phi0_pos, n->mode, nin, ins)); - } - - block->attr.block.matured = 1; - - block = optimize_in_place(block); - ir_vrfy(block); - } - -} - -/* changing the current block */ -void -switch_block (ir_node *target) -{ - current_ir_graph->current_block = target; -} - - -void -turn_into_tuple (ir_node *node, int arity) -{ - assert(node); - set_irn_op(node, op_Tuple); - if (get_irn_arity(node) == arity) { - /* keep old array */ - } else { - /* allocate new array, remove old one. */ - /* !!!??? free old in_array */ - node->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, arity+1); - } -} - - - -/* Insert irnode `new' in place of irnode `old' - Since `new' may be bigger than `old' replace `old' - by an op_Id which is smaller than everything */ -inline void -exchange (ir_node *old, ir_node *new) -{ - ir_node *block = old->in[0]; +/* kill a node by setting its predecessors to Bad and finally exchange the node by Bad itself. */ +void kill_node(ir_node *node) { + ir_graph *irg = get_irn_irg(node); + ir_node *bad = get_irg_bad(irg); + int i; - old->op = op_Id; - old->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, 2); - old->in[0] = block; - old->in[1] = new; + for (i = get_irn_arity(node) - 1; i >= -1; --i) { + set_irn_n(node, i, bad); + } + exchange(node, bad); }