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// inline.c
//

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

#include "slglobals.h"

struct InlineFunData_Rec {
    Scope *superGlobalScope;
    Scope *globalScope;
    Scope *masterScope;
    Scope *calleeScope;
    int *nextFunInlineIndex;
    int *nextTempIndex;
    int funInlineIndex;
    int funIndex;
    StmtList statements;
    void *scratch;
};

static void AddComment(InlineFunData *fFunData, SourceLoc *loc, const char *str)
{
    stmt *lStmt;

    lStmt = (stmt *) NewCommentStmt(Cg->pLastSourceLoc, str);
    AppendStatements(&fFunData->statements, lStmt);
} // AddComment

static stmt *DuplicateStatementTree(stmt *fStmt)
{
    stmt *lStmt, *mStmt, *nStmt, *pStmt, *headStmt, *lastStmt;
    expr *lExpr;

    headStmt = NULL;
    while (fStmt) {
        switch (fStmt->commonst.kind) {
        case EXPR_STMT:
            lExpr = DupExpr(fStmt->exprst.exp);
            lStmt = (stmt *) NewExprStmt(&fStmt->commonst.loc, lExpr);
            break;
        case IF_STMT:
            lExpr = DupExpr(fStmt->ifst.cond);
            mStmt = DuplicateStatementTree(fStmt->ifst.thenstmt);
            nStmt = DuplicateStatementTree(fStmt->ifst.elsestmt);
            lStmt = (stmt *) NewIfStmt(&fStmt->commonst.loc, lExpr, mStmt, nStmt);
            break;
        case WHILE_STMT:
        case DO_STMT:
            lExpr = DupExpr(fStmt->whilest.cond);
            mStmt = DuplicateStatementTree(fStmt->whilest.body);
            lStmt = (stmt *) NewWhileStmt(&fStmt->commonst.loc, fStmt->whilest.kind, lExpr, mStmt);
            break;
        case FOR_STMT:
            mStmt = DuplicateStatementTree(fStmt->forst.init);
            lExpr = DupExpr(fStmt->forst.cond);
            nStmt = DuplicateStatementTree(fStmt->forst.step);
            pStmt = DuplicateStatementTree(fStmt->forst.body);
            lStmt = (stmt *) NewForStmt(&fStmt->commonst.loc, mStmt, lExpr, nStmt, pStmt);
            break;
        case BLOCK_STMT:
            mStmt = DuplicateStatementTree(fStmt->blockst.body);
            lStmt = (stmt *) NewBlockStmt(&fStmt->commonst.loc, mStmt);
            break;
        case RETURN_STMT:
            lExpr = DupExpr(fStmt->exprst.exp);
            lStmt = (stmt *) NewReturnStmt(&fStmt->commonst.loc, NULL, lExpr);
            break;
        case DISCARD_STMT:
            lExpr = DupExpr(fStmt->discardst.cond);
            lStmt = (stmt *) NewDiscardStmt(&fStmt->commonst.loc, lExpr);
            break;
        case COMMENT_STMT:
            lStmt = (stmt *) NewCommentStmt(&fStmt->commonst.loc,
                                            GetAtomString(atable, fStmt->commentst.str));
            break;
        default:
            lStmt = fStmt;
            assert(!"DuplicateStatementTree() - not yet finished");
            break;
        }
        if (headStmt) {
            lastStmt->commonst.next = lStmt;
        } else {
            headStmt = lStmt;
        }
        lastStmt = lStmt;
        fStmt = fStmt->commonst.next;
    }
    return headStmt;
} // DuplicateStatementTree

/*
 * ConvertReturnStatement() - Convert return statements into assignments.
 *
 */

static stmt *ConvertReturnStatement(stmt *fStmt, void *arg1, int arg2)
{
    stmt *lStmt;
    Symbol *retSymb;
    expr *lExpr;

    if (fStmt) {
        switch (fStmt->commonst.kind) {
        case RETURN_STMT:
            if (arg1) {
                retSymb = (Symbol *) arg1;
                lExpr = (expr *) NewSymbNode(VARIABLE_OP, retSymb);
                lStmt = NewSimpleAssignmentStmt(Cg->pLastSourceLoc, lExpr, fStmt->exprst.exp, 1);
            } else {
                lStmt = NULL;
            }
            break;
        default:
            lStmt = fStmt;
            break;
        }
    } else {
        lStmt = NULL;
    }
    return lStmt;
} // ConvertReturnStatement

#define NOT_DUPLICATED          0
#define ALREADY_DUPLICATED      1
#define IN_MASTER_SCOPE         2
#define IN_GLOBAL_SCOPE         3
#define IN_SUPER_GLOBAL_SCOPE   4

/*
 * ConvertLocalReferences() - Convert return statements into assignments.  Assume that this
 *         can be done in place since we're working with a copy of the original symb structs.
 *
 */

static expr *ConvertLocalReferences(expr *fExpr, void *arg1, int arg2)
{
    InlineFunData *lFunData = (InlineFunData *) arg1;
    expr *lExpr = fExpr;
    Symbol *lSymb, *nSymb;
    Type *lType;
    int qualifiers;
    int name;

    lExpr = fExpr;
    if (fExpr) {
        switch (fExpr->common.kind) {
        case SYMB_N:
            lSymb = lExpr->sym.symbol;
            if (fExpr->sym.op == VARIABLE_OP && lSymb->kind == VARIABLE_S) {
                switch (lSymb->flags) {
                case NOT_DUPLICATED:
                    name = GetNumberedAtom(GetAtomString(atable, lSymb->name), lFunData->funInlineIndex, 4, '-');
                    if (LookUpLocalSymbol(lFunData->masterScope, name)) {
                        InternalError(Cg->pLastSourceLoc, 9999, "Name \"%s\"-%04d shouldn't be defined, but is!",
                                      GetAtomString(atable, lSymb->name), lFunData->funInlineIndex);
                        if (Cg->options.DumpParseTree) {
                            InternalError(Cg->pLastSourceLoc, 9999, "*** Scope %d definitions ***",
                                          lFunData->masterScope->level);
                            PrintSymbolTree(lFunData->masterScope->symbols);
                            InternalError(Cg->pLastSourceLoc, 9999, "*** End of Scope %d ***",
                                          lFunData->masterScope->level);
                        }
                    }
                    // Remove qualifiers if any present:
                    lType = lSymb->type;
                    qualifiers = GetQualifiers(lType);
                    if (qualifiers) {
                        lType = DupType(lType);
                        ClearTypeMisc(lType, TYPE_QUALIFIER_MASK);
                    }
                    nSymb = DefineVar(&lSymb->loc, lFunData->masterScope, name, lType);
                    nSymb->properties = lSymb->properties;
                    nSymb->flags = IN_MASTER_SCOPE;
                    lSymb->tempptr = (void *) nSymb;
                    lSymb->flags = ALREADY_DUPLICATED;
                    break;
                case IN_MASTER_SCOPE:
                case IN_GLOBAL_SCOPE:
                case IN_SUPER_GLOBAL_SCOPE:
                    nSymb = lSymb;
                    break;
                case ALREADY_DUPLICATED:
                    nSymb = (Symbol *) lSymb->tempptr;
                    break;
                default:
                    FatalError("Bad scope in ConvertLocalReferences()");
                    break;
                }
                lExpr->sym.symbol = nSymb;
            }
            break;
        case CONST_N:
        case UNARY_N:
        case BINARY_N:
        case TRINARY_N:
            break;
        case DECL_N:
        default:
            assert(!"bad kind to ConvertLocalReferences()");
            break;
        }
    }