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// support_iter.c
//
// Routines to iterate over the expr/stmt graph
//

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>

#include "slglobals.h"

/*
 * ApplyToNodes() - Walk an expression tree and apply "pre" and "post" to
 * each node.  pre is applied in prefix order, and post in postfix
 *
 */
expr *ApplyToNodes(expr *(*pre)(expr *, void *, int),
                   expr *(*post)(expr *, void *, int),
                   expr *fExpr, void *arg1, int arg2)
{
    if (fExpr) {
        if (pre) fExpr = pre(fExpr, arg1, arg2);
        switch (fExpr->common.kind) {
        case DECL_N:
        case SYMB_N:
        case CONST_N:
            break;
        case UNARY_N:
            fExpr->un.arg = ApplyToNodes(pre, post, fExpr->un.arg, arg1, arg2);
            break;
        case BINARY_N:
            fExpr->bin.left = ApplyToNodes(pre, post, fExpr->bin.left, arg1, arg2);
            fExpr->bin.right = ApplyToNodes(pre, post, fExpr->bin.right, arg1, arg2);
            break;
        case TRINARY_N:
            fExpr->tri.arg1 = ApplyToNodes(pre, post, fExpr->tri.arg1, arg1, arg2);
            fExpr->tri.arg2 = ApplyToNodes(pre, post, fExpr->tri.arg2, arg1, arg2);
            fExpr->tri.arg3 = ApplyToNodes(pre, post, fExpr->tri.arg3, arg1, arg2);
            break;
        default:
            assert(!"bad kind to ApplyToNodes()");
            break;
        }
        if (post) fExpr = post(fExpr, arg1, arg2);
    }
    return fExpr;
} // ApplyToNodes

/*
 * ApplyToExpressions() - Walk a source tree and apply "fun" to each node in each
 *         expression in prefix order.
 */

void ApplyToExpressions(expr *(*pre)(expr *, void *, int),
                        expr *(*post)(expr *, void *, int),
                        stmt *fStmt, void *arg1, int arg2)
{
    while (fStmt) {
        Cg->lastSourceLoc = fStmt->commonst.loc;
        switch (fStmt->exprst.kind) {
        case EXPR_STMT:
            fStmt->exprst.exp = ApplyToNodes(pre, post, fStmt->exprst.exp, arg1, arg2);
            break;
        case IF_STMT:
            fStmt->ifst.cond = ApplyToNodes(pre, post, fStmt->ifst.cond, arg1, arg2);
            ApplyToExpressions(pre, post, fStmt->ifst.thenstmt, arg1, arg2);
            ApplyToExpressions(pre, post, fStmt->ifst.elsestmt, arg1, arg2);
            break;
        case WHILE_STMT:
        case DO_STMT:
            fStmt->whilest.cond = ApplyToNodes(pre, post, fStmt->whilest.cond, arg1, arg2);
            ApplyToExpressions(pre, post, fStmt->whilest.body, arg1, arg2);
            break;
        case FOR_STMT:
            ApplyToExpressions(pre, post, fStmt->forst.init, arg1, arg2);
            fStmt->forst.cond = ApplyToNodes(pre, post, fStmt->forst.cond, arg1, arg2);
            ApplyToExpressions(pre, post, fStmt->forst.body, arg1, arg2);
            ApplyToExpressions(pre, post, fStmt->forst.step, arg1, arg2);
            break;
        case BLOCK_STMT:
            ApplyToExpressions(pre, post, fStmt->blockst.body, arg1, arg2);
            break;
        case RETURN_STMT:
            fStmt->returnst.exp = ApplyToNodes(pre, post, fStmt->returnst.exp, arg1, arg2);
            break;
        case DISCARD_STMT:
            fStmt->discardst.cond = ApplyToNodes(pre, post, fStmt->discardst.cond, arg1, arg2);
            break;
        case COMMENT_STMT:
            break;
        default:
            assert(0);
            break;
        }
        fStmt = fStmt->exprst.next;
    }
} // ApplyToExpressions

/*
 * ApplyToExpressionsLocal() - Apply a function to each node in the expressions contained in
 *         a single statement.
 */

void ApplyToExpressionsLocal(expr *(*pre)(expr *, void *, int),
                             expr *(*post)(expr *, void *, int),
                             stmt *fStmt, void *arg1, int arg2)
{
    if (fStmt) {
        Cg->lastSourceLoc = fStmt->commonst.loc;
        switch (fStmt->exprst.kind) {
        case EXPR_STMT:
            fStmt->exprst.exp = ApplyToNodes(pre, post, fStmt->exprst.exp, arg1, arg2);
            break;
        case IF_STMT:
            fStmt->ifst.cond = ApplyToNodes(pre, post, fStmt->ifst.cond, arg1, arg2);
            break;
        case WHILE_STMT:
        case DO_STMT:
            fStmt->whilest.cond = ApplyToNodes(pre, post, fStmt->whilest.cond, arg1, arg2);
            break;
        case FOR_STMT:
            fStmt->forst.cond = ApplyToNodes(pre, post, fStmt->forst.cond, arg1, arg2);
            break;
        case BLOCK_STMT:
            break;
        case RETURN_STMT:
            fStmt->returnst.exp = ApplyToNodes(pre, post, fStmt->returnst.exp, arg1, arg2);
            break;
        case DISCARD_STMT:
            fStmt->discardst.cond = ApplyToNodes(pre, post, fStmt->discardst.cond, arg1, arg2);
            break;
        case COMMENT_STMT:
            break;
        default:
            assert(0);
            break;
        }
        //fStmt = fStmt->exprst.next;
    }
} // ApplyToExpressionsLocal

/*
 * ApplyToTopExpressions() - Walk a source tree and apply a function to each expression.
 *
 */

void ApplyToTopExpressions(expr *(*fun)(expr *, void *, int), stmt *fStmt, void *arg1, int arg2)
{
    while (fStmt) {
        Cg->lastSourceLoc = fStmt->commonst.loc;
        switch (fStmt->exprst.kind) {
        case EXPR_STMT:
            fStmt->exprst.exp = fun(fStmt->exprst.exp, arg1, arg2);
            break;
        case IF_STMT:
            fStmt->ifst.cond = fun(fStmt->ifst.cond, arg1, arg2);
            ApplyToTopExpressions(fun, fStmt->ifst.thenstmt, arg1, arg2);
            ApplyToTopExpressions(fun, fStmt->ifst.elsestmt, arg1, arg2);
            break;
        case WHILE_STMT:
        case DO_STMT:
            fStmt->whilest.cond = fun(fStmt->whilest.cond, arg1, arg2);
            ApplyToTopExpressions(fun, fStmt->whilest.body, arg1, arg2);
            break;
        case FOR_STMT:
            ApplyToTopExpressions(fun, fStmt->forst.init, arg1, arg2);
            fStmt->forst.cond = fun(fStmt->forst.cond, arg1, arg2);
            ApplyToTopExpressions(fun, fStmt->forst.body, arg1, arg2);
            ApplyToTopExpressions(fun, fStmt->forst.step, arg1, arg2);
            break;
        case BLOCK_STMT:
            ApplyToTopExpressions(fun, fStmt->blockst.body, arg1, arg2);
            break;
        case RETURN_STMT:
            fStmt->returnst.exp = fun(fStmt->returnst.exp, arg1, arg2);
            break;
        case DISCARD_STMT:
            fStmt->discardst.cond = fun(fStmt->discardst.cond, arg1, arg2);
            break;
        case COMMENT_STMT:
            break;
        default:
            assert(0);
            break;
        }
        fStmt = fStmt->exprst.next;
    }
} // ApplyToTopExpressions

/*
 * ApplyToStatements() - Walk a source tree and apply a transformations to
 *    each statememt
 */

stmt *ApplyToStatements(stmt *(*pre)(stmt *, void *, int),
                        stmt *(*post)(stmt *, void *, int),
                        stmt *fStmt, void *arg1, int arg2)
{
    stmt *head = NULL, *last = NULL, *lStmt, *next, *rest = fStmt;

    while (fStmt) {
        // Transform each statement into a possible NULL list of statements:
        // Prepend any statements returned to the list to be processed, and
        // remember what the next one to be done is (rest), so we don't
        // rerun pre on any of the returned statements directly.
        if (pre && rest == fStmt) {
            Cg->lastSourceLoc = fStmt->commonst.loc;
            rest = fStmt->commonst.next;
            fStmt->commonst.next = NULL;
            lStmt = pre(fStmt, arg1, arg2);
            if (lStmt) {
                fStmt = lStmt;
                while (lStmt->commonst.next && lStmt->commentst.next != rest) {
                    lStmt = lStmt->commonst.next;
                }
                lStmt->commonst.next = rest;
            } else {
                // Nothing returned - go to next statement:
                fStmt = rest;
                continue;
            }
        }

        // Now apply transformation to substatements:

        switch (fStmt->exprst.kind) {
        case EXPR_STMT:
            break;
        case IF_STMT:
            fStmt->ifst.thenstmt = ApplyToStatements(pre, post, fStmt->ifst.thenstmt, arg1, arg2);
            fStmt->ifst.elsestmt = ApplyToStatements(pre, post, fStmt->ifst.elsestmt, arg1, arg2);
            break;
        case WHILE_STMT:
        case DO_STMT:
            fStmt->whilest.body = ApplyToStatements(pre, post, fStmt->whilest.body, arg1, arg2);
            break;
        case FOR_STMT:
            fStmt->forst.init = ApplyToStatements(pre, post, fStmt->forst.init, arg1, arg2);
            fStmt->forst.body = ApplyToStatements(pre, post, fStmt->forst.body, arg1, arg2);
            fStmt->forst.step = ApplyToStatements(pre, post, fStmt->forst.step, arg1, arg2);
            break;
        case BLOCK_STMT:
            fStmt->blockst.body = ApplyToStatements(pre, post, fStmt->blockst.body, arg1, arg2);
            break;
        case RETURN_STMT:
        case DISCARD_STMT:
        case COMMENT_STMT:
            break;
        default:
            assert(0);
            break;
        }

        // Append any statements returned by "post" to the end of the list:

        next = fStmt->commonst.next;
        if (post) {
            Cg->lastSourceLoc = fStmt->commonst.loc;
            lStmt = post(fStmt, arg1, arg2);
        } else {
            lStmt = fStmt;
        }
        if (lStmt) {
            if (head) {
                last->commonst.next = lStmt;
            } else {
                head = lStmt;
            }
            last = lStmt;
            while (last->commonst.next && last->commentst.next != next) {
                last = last->commonst.next;
            }
            last->commonst.next = NULL;
        }
        fStmt = next;
    }
    return head;
} // ApplyToStatements

/*
 * PostApplyToChildStatements() - Apply a postfix order transformation to each child
 *         statememt of this statement.
 */

void PostApplyToChildStatements(stmt *(*fun)(stmt *, void *, int), stmt *fStmt, void *arg1, int arg2)
{
    if (fStmt) {

        // Apply a transformation to each nested statement, but not the top level statements:

        Cg->lastSourceLoc = fStmt->commonst.loc;
        switch (fStmt->exprst.kind) {
        case EXPR_STMT:
            break;
        case IF_STMT:
            fStmt->ifst.thenstmt = PostApplyToStatements(fun, fStmt->ifst.thenstmt, arg1, arg2);
            fStmt->ifst.elsestmt = PostApplyToStatements(fun, fStmt->ifst.elsestmt, arg1, arg2);
            break;
        case WHILE_STMT:
        case DO_STMT:
            fStmt->whilest.body = PostApplyToStatements(fun, fStmt->whilest.body, arg1, arg2);
            break;
        case FOR_STMT:
            fStmt->forst.init = PostApplyToStatements(fun, fStmt->forst.init, arg1, arg2);
            fStmt->forst.body = PostApplyToStatements(fun, fStmt->forst.body, arg1, arg2);
            fStmt->forst.step = PostApplyToStatements(fun, fStmt->forst.step, arg1, arg2);
            break;
        case BLOCK_STMT:
            fStmt->blockst.body = PostApplyToStatements(fun, fStmt->blockst.body, arg1, arg2);
            break;
        case RETURN_STMT:
        case DISCARD_STMT:
        case COMMENT_STMT:
            break;
        default:
            assert(0);
            break;
        }
    }
} // PostApplyToChildStatements