#include "compiler/IroLinearForm.h"
#include "compiler/IroDump.h"
#include "compiler/IroFlowgraph.h"
#include "compiler/IroUtil.h"
#include "compiler/IroVars.h"
#include "compiler/CError.h"
#include "compiler/CExpr.h"
#include "compiler/CFunc.h"
#include "compiler/CInt64.h"
#include "compiler/CParser.h"
#include "compiler/CompilerTools.h"
#include "compiler/InlineAsm.h"
#include "compiler/InlineAsmPPC.h"
#include "compiler/types.h"

typedef struct NullCheckListNode {
    SInt32 precompid;
    Object *tempobj;
    struct NullCheckListNode *next;
} NullCheckListNode;

IROLinear *IRO_FirstLinear;
IROLinear *IRO_LastLinear;
UInt32 IRO_NumLinear;
Statement *CurStat;
static NullCheckListNode *NullCheckList;
static Statement *CurrStmt;
static Statement *PrevStmt;

static void LinkLinear(IROLinear *linear) {
    linear->index = IRO_NumLinear++;
    if (IRO_FirstLinear)
        IRO_LastLinear->next = linear;
    else
        IRO_FirstLinear = linear;
    IRO_LastLinear = linear;
}

IROLinear *IRO_NewLinear(IROLinearType type) {
    IROLinear *linear = oalloc(sizeof(IROLinear));
    memset(linear, 0, sizeof(IROLinear));
    linear->stmt = CurStat;
    linear->nodetype = EPOSTINC;
    linear->next = NULL;
    linear->type = type;
    linear->rtype = NULL;
    linear->flags = 0;
    linear->nodeflags = 0;
    linear->expr = NULL;
    linear->x16 = 0;
    return linear;
}

static void MarkAssigned(IROLinear *linear, Boolean flag) {
    IROLinear *inner;
    IROAddrRecord *rec;

    if (IS_LINEAR_MONADIC(linear, EINDIRECT) && IS_LINEAR_MONADIC(linear->u.monadic, EBITFIELD)) {
        linear->flags |= IROLF_Assigned;
        inner = linear->u.monadic->u.monadic;
        if (inner->type == IROLinearOperand) {
            inner->flags |= IROLF_Assigned;
            if (flag) {
                linear->flags |= IROLF_Used;
                inner->flags |= IROLF_Used;
            }
        }

        if (IS_LINEAR_DIADIC(inner, EADD)) {
            if (IS_LINEAR_ENODE(inner->u.diadic.left, EOBJREF)) {
                if (IS_LINEAR_ENODE(inner->u.diadic.right, EINTCONST))
                    inner->u.diadic.left->flags |= IROLF_Assigned;
                if (flag) {
                    linear->flags |= IROLF_Used;
                    inner->u.diadic.left->flags |= IROLF_Used;
                }
            }

            rec = IRO_InitAddrRecordPointer(inner);
            IRO_DecomposeAddressExpression(inner, rec);
            if (rec->numObjRefs == 1 && IS_LINEAR_ENODE(inner->u.diadic.left, EOBJREF)) {
                rec->objRefs->element->flags |= IROLF_Assigned;
                if (flag) {
                    linear->flags |= IROLF_Used;
                    rec->objRefs->element->flags |= IROLF_Used;
                }
            }
        }
    }

    if (IS_LINEAR_MONADIC(linear, EINDIRECT)) {
        linear->flags |= IROLF_Assigned;
        if (linear->u.monadic->type == IROLinearOperand) {
            linear->u.monadic->flags |= IROLF_Assigned;
            if (flag) {
                linear->flags |= IROLF_Used;
                linear->u.monadic->flags |= IROLF_Used;
            }
        }
    }

    if (IS_LINEAR_MONADIC(linear, EINDIRECT)) {
        linear->flags |= IROLF_Assigned;
        inner = linear->u.monadic;

        if (IS_LINEAR_DIADIC(inner, EADD)) {
            if (IS_LINEAR_ENODE(inner->u.diadic.left, EOBJREF)) {
                if (IS_LINEAR_ENODE(inner->u.diadic.right, EINTCONST))
                    inner->u.diadic.left->flags |= IROLF_Assigned;
                if (flag) {
                    linear->flags |= IROLF_Used;
                    inner->u.diadic.left->flags |= IROLF_Used;
                }
            }

            rec = IRO_InitAddrRecordPointer(inner);
            IRO_DecomposeAddressExpression(inner, rec);
            if (rec->numObjRefs == 1 && IS_LINEAR_ENODE(inner->u.diadic.left, EOBJREF)) {
                rec->objRefs->element->flags |= IROLF_Assigned;
                if (flag) {
                    linear->flags |= IROLF_Used;
                    rec->objRefs->element->flags |= IROLF_Used;
                }
            }
        }
    }
}

static void MarkSubscript(IROLinear *linear) {
    linear->flags |= IROLF_Subs;
    if (IS_LINEAR_DIADIC(linear, EADD)) {
        if (IRO_IsAddressMultiply(linear->u.diadic.left) || IS_LINEAR_MONADIC(linear->u.diadic.left, EINDIRECT))
            linear->u.diadic.left->flags |= IROLF_Subs;
        if (IRO_IsAddressMultiply(linear->u.diadic.right) || IS_LINEAR_MONADIC(linear->u.diadic.right, EINDIRECT))
            linear->u.diadic.right->flags |= IROLF_Subs;

        if (IS_LINEAR_DIADIC(linear->u.diadic.left, EADD))
            MarkSubscript(linear->u.diadic.left);
        if (IS_LINEAR_DIADIC(linear->u.diadic.right, EADD))
            MarkSubscript(linear->u.diadic.right);
    }
}

static void MarkArgs(IROLinear *linear) {
    int i;
    linear->flags |= IROLF_4000;

    switch (linear->type) {
        case IROLinearEnd:
            break;
        case IROLinearOp1Arg:
        case IROLinearBeginCatch:
        case IROLinearEndCatch:
        case IROLinearEndCatchDtor:
            MarkArgs(linear->u.monadic);
            break;
        case IROLinearOp2Arg:
            MarkArgs(linear->u.diadic.left);
            MarkArgs(linear->u.diadic.right);
            break;
        case IROLinearIf:
        case IROLinearIfNot:
            MarkArgs(linear->u.label.x4);
            break;
        case IROLinearReturn:
            if (linear->u.monadic)
                MarkArgs(linear->u.monadic);
            break;
        case IROLinearSwitch:
            MarkArgs(linear->u.swtch.x4);
            break;
        case IROLinearOp3Arg:
            MarkArgs(linear->u.args3.a);
            MarkArgs(linear->u.args3.b);
            MarkArgs(linear->u.args3.c);
            break;
        case IROLinearFunccall:
            MarkArgs(linear->u.funccall.linear8);
            for (i = 0; i < linear->u.funccall.argCount; i++)
                MarkArgs(linear->u.funccall.args[i]);
            break;
    }
}

// assumed name, position
static inline void MarkSubExpr(IROLinear *linear) {
    int i;

    switch (linear->type) {
        case IROLinearNop:
        case IROLinearOperand:
        case IROLinearGoto:
        case IROLinearLabel:
        case IROLinearEntry:
        case IROLinearExit:
        case IROLinearAsm:
        case IROLinearEnd:
            break;
        case IROLinearOp1Arg:
        case IROLinearBeginCatch:
        case IROLinearEndCatch:
        case IROLinearEndCatchDtor:
            linear->u.monadic->flags |= IROLF_Reffed;
            break;
        case IROLinearOp2Arg:
            linear->u.diadic.left->flags |= IROLF_Reffed;
            linear->u.diadic.right->flags |= IROLF_Reffed;
            break;
        case IROLinearIf:
        case IROLinearIfNot:
            linear->u.label.x4->flags |= IROLF_Reffed;
            break;
        case IROLinearReturn:
            if (linear->u.monadic)
                linear->u.monadic->flags |= IROLF_Reffed;
            break;
        case IROLinearSwitch:
            linear->u.swtch.x4->flags |= IROLF_Reffed;
            break;
        case IROLinearOp3Arg:
            linear->u.args3.a->flags |= IROLF_Reffed;
            linear->u.args3.b->flags |= IROLF_Reffed;
            linear->u.args3.c->flags |= IROLF_Reffed;
            break;
        case IROLinearFunccall:
            linear->u.funccall.linear8->flags |= IROLF_Reffed;
            for (i = 0; i < linear->u.funccall.argCount; i++)
                linear->u.funccall.args[i]->flags |= IROLF_Reffed;
            break;
        default:
            CError_FATAL(368);
    }
}

static void MarkSubs1(IROLinear *linear) {
    IROAddrRecord *rec;

    if (IS_LINEAR_MONADIC(linear, EBITFIELD)) {
        linear = linear->u.monadic;
        if (IS_LINEAR_ENODE(linear, EOBJREF))
            linear->flags |= IROLF_Ind;
    }

    if (IS_LINEAR_DIADIC(linear, EADD)) {
        if (IS_LINEAR_ENODE(linear->u.diadic.left, EOBJREF) && IS_LINEAR_ENODE(linear->u.diadic.right, EINTCONST))
            linear->u.diadic.left->flags |= IROLF_Ind;

        rec = IRO_InitAddrRecordPointer(linear);
        IRO_DecomposeAddressExpression(linear, rec);
        if (rec->numObjRefs == 1 && IS_LINEAR_ENODE(linear->u.diadic.left, EOBJREF))
            rec->objRefs->element->flags |= IROLF_Ind;
    }
}

static void MakeLeftChildAsAssignment(ENode *enode) {
    Statement *stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = enode->data.diadic.left;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void AssignCommaRToTemp(ENode *enode, Boolean flag) {
    Statement *stmt;

    if (!IS_TYPE_VOID(enode->rtype) && !flag) {
        Object *obj = create_temp_object(enode->rtype);
        ENode *indnode = IRO_NewENode(EINDIRECT);
        indnode->data.monadic = create_objectrefnode(obj);

        if (!IS_TYPE_VOID(enode->rtype))
            indnode->rtype = enode->rtype;
        else
            CError_FATAL(548);

        stmt = lalloc(sizeof(Statement));
        memset(stmt, 0, sizeof(Statement));
        stmt->type = ST_EXPRESSION;
        stmt->expr = IRO_NewENode(EASS);
        stmt->expr->data.diadic.left = indnode;
        stmt->expr->data.diadic.right = enode->data.diadic.right;
        stmt->expr->rtype = enode->rtype;
        stmt->dobjstack = CurrStmt->dobjstack;
        stmt->sourceoffset = CurrStmt->sourceoffset;
        stmt->sourcefilepath = CurrStmt->sourcefilepath;
        stmt->value = CurrStmt->value;
        stmt->flags = CurrStmt->flags;

        if (PrevStmt) {
            stmt->next = PrevStmt->next;
            PrevStmt->next = stmt;
        } else {
            stmt->next = NULL;
        }
        PrevStmt = stmt;

        enode->type = EINDIRECT;
        enode->data.monadic = create_objectrefnode(obj);
        CError_ASSERT(580, !IS_TYPE_VOID(enode->rtype));
    } else {
        stmt = lalloc(sizeof(Statement));
        memset(stmt, 0, sizeof(Statement));
        stmt->type = ST_EXPRESSION;
        stmt->expr = enode->data.diadic.right;
        stmt->dobjstack = CurrStmt->dobjstack;
        stmt->sourceoffset = CurrStmt->sourceoffset;
        stmt->sourcefilepath = CurrStmt->sourcefilepath;
        stmt->value = CurrStmt->value;
        stmt->flags = CurrStmt->flags;

        if (PrevStmt) {
            stmt->next = PrevStmt->next;
            PrevStmt->next = stmt;
        } else {
            stmt->next = NULL;
        }
        PrevStmt = stmt;

        enode->type = EINTCONST;
        enode->data.intval = cint64_zero;
    }
}

static void AssignDangerousArgumentToTemp(ENode *enode) {
    Statement *stmt;
    Object *obj;
    ENode *indnode;
    ENode *rightnode;

    obj = create_temp_object(enode->rtype);
    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(obj);

    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        CError_FATAL(627);

    rightnode = IRO_NewENode(enode->type);
    memcpy(rightnode, enode, sizeof(ENode));

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = rightnode;
    stmt->expr->rtype = enode->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    enode->type = EINDIRECT;
    enode->data.monadic = create_objectrefnode(obj);
}

static void CreateTempAssignmentToZero(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;
    ENode *rightnode;

    *objptr = create_temp_object(enode->rtype);
    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        CError_FATAL(678);

    rightnode = IRO_NewENode(EINTCONST);
    rightnode->data.intval = cint64_zero;
    rightnode->rtype = enode->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = rightnode;
    stmt->expr->rtype = enode->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void CreateTempAssignmentToOne(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;
    ENode *rightnode;

    *objptr = create_temp_object(enode->rtype);
    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        CError_FATAL(720);

    rightnode = IRO_NewENode(EINTCONST);
    rightnode->data.intval = cint64_one;
    rightnode->rtype = enode->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = rightnode;
    stmt->expr->rtype = enode->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateCondExpression(ENode *enode, CLabel **label) {
    Statement *stmt;

    *label = IRO_NewLabel();

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFNGOTO;
    stmt->expr = enode->data.cond.cond;
    stmt->label = *label;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateGoToStmt(ENode *enode, CLabel **label) {
    Statement *stmt;

    *label = IRO_NewLabel();

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_GOTO;
    stmt->label = *label;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void PutTempOnNullCheckList(ENode *expr, Object *obj) {
    NullCheckListNode *n = lalloc(sizeof(NullCheckListNode));
    n->precompid = expr->data.nullcheck.precompid;
    n->tempobj = obj;
    n->next = NULL;
    if (NullCheckList) {
        n->next = NullCheckList;
        NullCheckList = n;
    } else {
        NullCheckList = n;
    }
}

static Object *GetTempFromtheList(ENode *expr) {
    NullCheckListNode *n;

    for (n = NullCheckList; n; n = n->next) {
        if (n->precompid == expr->data.precompid)
            break;
    }

    CError_ASSERT(839, n);
    return n->tempobj;
}

static void GenerateNullcheckExprTempAssignment(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;

    if (!IS_TYPE_VOID(enode->rtype))
        *objptr = create_temp_object(enode->rtype);
    else
        *objptr = create_temp_object(enode->data.nullcheck.nullcheckexpr->rtype);

    PutTempOnNullCheckList(enode, *objptr);

    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        indnode->rtype = enode->data.nullcheck.nullcheckexpr->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = enode->data.nullcheck.nullcheckexpr;
    if (!IS_TYPE_VOID(enode->rtype))
        stmt->expr->rtype = enode->rtype;
    else
        stmt->expr->rtype = enode->data.nullcheck.nullcheckexpr->rtype;

    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateExpr1TempAssignment(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;

    if (!IS_TYPE_VOID(enode->rtype)) {
        *objptr = create_temp_object(enode->rtype);
        indnode = IRO_NewENode(EINDIRECT);
        indnode->data.monadic = create_objectrefnode(*objptr);
        indnode->rtype = enode->rtype;
        CError_ASSERT(905, !IS_TYPE_VOID(enode->rtype));
    }

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    if (!IS_TYPE_VOID(enode->rtype)) {
        stmt->expr = IRO_NewENode(EASS);
        stmt->expr->data.diadic.left = indnode;
        stmt->expr->data.diadic.right = enode->data.cond.expr1;
        stmt->expr->rtype = enode->rtype;
    } else {
        stmt->expr = enode->data.cond.expr1;
    }

    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateExpr2TempAssignment(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;

    if (!IS_TYPE_VOID(enode->rtype)) {
        indnode = IRO_NewENode(EINDIRECT);
        indnode->data.monadic = create_objectrefnode(*objptr);
        indnode->rtype = enode->rtype;
        CError_ASSERT(953, !IS_TYPE_VOID(enode->rtype));
    }

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    if (!IS_TYPE_VOID(enode->rtype)) {
        stmt->expr = IRO_NewENode(EASS);
        stmt->expr->data.diadic.left = indnode;
        stmt->expr->data.diadic.right = enode->data.cond.expr2;
        stmt->expr->rtype = enode->rtype;
    } else {
        stmt->expr = enode->data.cond.expr2;
    }

    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateForceLoadTempAssignment(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;

    if (!IS_TYPE_VOID(enode->rtype)) {
        *objptr = create_temp_object(enode->rtype);
        indnode = IRO_NewENode(EINDIRECT);
        indnode->data.monadic = create_objectrefnode(*objptr);
        indnode->rtype = enode->rtype;
        CError_ASSERT(1003, !IS_TYPE_VOID(enode->rtype));
    }

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    if (!IS_TYPE_VOID(enode->rtype)) {
        stmt->expr = IRO_NewENode(EASS);
        stmt->expr->data.diadic.left = indnode;
        stmt->expr->data.diadic.right = enode->data.monadic;
        stmt->expr->rtype = enode->rtype;
    } else {
        stmt->expr = enode->data.monadic;
    }

    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateLabel(CLabel **labelptr) {
    Statement *stmt;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_LABEL;
    stmt->label = *labelptr;
    stmt->label->stmt = stmt;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateIfNotTemp(ENode *enode, Object **objptr, CLabel **labelptr) {
    Statement *stmt;
    ENode *indnode;

    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        indnode->rtype = enode->data.monadic->rtype;

    *labelptr = IRO_NewLabel();

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFNGOTO;
    stmt->expr = indnode;
    stmt->label = *labelptr;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void GenerateNullcheckCondExpr(ENode *enode, Object **objptr) {
    Statement *stmt;
    ENode *indnode;

    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        indnode->rtype = enode->data.nullcheck.nullcheckexpr->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = enode->data.nullcheck.condexpr;
    if (!IS_TYPE_VOID(enode->rtype))
        stmt->expr->rtype = enode->rtype;
    else
        stmt->expr->rtype = enode->data.nullcheck.nullcheckexpr->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void TransformLogicalAndLHS(ENode *enode, Object **objptr, CLabel **labelptr) {
    Statement *stmt;

    *labelptr = IRO_NewLabel();

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFNGOTO;
    stmt->expr = enode->data.diadic.left;
    stmt->label = *labelptr;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void TransformLogicalAndRHS(ENode *enode, Object **objptr, CLabel **labelptr) {
    Statement *stmt;
    ENode *indnode;
    ENode *rightnode;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFNGOTO;
    stmt->expr = enode->data.diadic.right;
    stmt->label = *labelptr;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        CError_FATAL(1225);

    rightnode = IRO_NewENode(EINTCONST);
    rightnode->data.intval = cint64_one;
    rightnode->rtype = enode->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = rightnode;
    stmt->expr->rtype = enode->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_LABEL;
    stmt->label = *labelptr;
    stmt->label->stmt = stmt;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    enode->type = EINDIRECT;
    enode->data.monadic = create_objectrefnode(*objptr);
    CError_ASSERT(1276, !IS_TYPE_VOID(enode->rtype));
}

static void TransformLogicalOrLHS(ENode *enode, Object **objptr, CLabel **labelptr) {
    Statement *stmt;

    *labelptr = IRO_NewLabel();

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFGOTO;
    stmt->expr = enode->data.diadic.left;
    stmt->label = *labelptr;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;
}

static void TransformLogicalOrRHS(ENode *enode, Object **objptr, CLabel **labelptr) {
    Statement *stmt;
    ENode *indnode;
    ENode *rightnode;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_IFGOTO;
    stmt->expr = enode->data.diadic.right;
    stmt->label = *labelptr;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    indnode = IRO_NewENode(EINDIRECT);
    indnode->data.monadic = create_objectrefnode(*objptr);
    if (!IS_TYPE_VOID(enode->rtype))
        indnode->rtype = enode->rtype;
    else
        CError_FATAL(1354);

    rightnode = IRO_NewENode(EINTCONST);
    rightnode->data.intval = cint64_zero;
    rightnode->rtype = enode->rtype;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_EXPRESSION;
    stmt->expr = IRO_NewENode(EASS);
    stmt->expr->data.diadic.left = indnode;
    stmt->expr->data.diadic.right = rightnode;
    stmt->expr->rtype = enode->rtype;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = ST_LABEL;
    stmt->label = *labelptr;
    stmt->label->stmt = stmt;
    stmt->dobjstack = CurrStmt->dobjstack;
    stmt->sourceoffset = CurrStmt->sourceoffset;
    stmt->sourcefilepath = CurrStmt->sourcefilepath;
    stmt->value = CurrStmt->value;
    stmt->flags = CurrStmt->flags;

    if (PrevStmt) {
        stmt->next = PrevStmt->next;
        PrevStmt->next = stmt;
    } else {
        stmt->next = NULL;
    }
    PrevStmt = stmt;

    enode->type = EINDIRECT;
    enode->data.monadic = create_objectrefnode(*objptr);
    CError_ASSERT(1405, !IS_TYPE_VOID(enode->rtype));
}

static void LinearizeExpr1(ENode *a, ENode *b, Boolean flag, Boolean flag2) {
    switch (a->type) {
        ENODE_CASE_MONADIC:
            LinearizeExpr1(a->data.monadic, a, 0, 0);
            if (a->type == EFORCELOAD) {
                Object *obj;
                GenerateForceLoadTempAssignment(a, &obj);
                a->type = EINDIRECT;
                a->data.monadic = create_objectrefnode(obj);
                CError_ASSERT(1428, !IS_TYPE_VOID(a->rtype));
            }
            break;
        ENODE_CASE_DIADIC_1:
        case ECOMMA:
        case EPMODULO:
        case EROTL:
        case EROTR:
        case EBTST:
            if (a->type == ECOMMA) {
                LinearizeExpr1(a->data.diadic.left, a, 1, 0);
                MakeLeftChildAsAssignment(a);
                LinearizeExpr1(a->data.diadic.right, a, 0, 0);
                AssignCommaRToTemp(a, flag);
            } else if (a->data.diadic.right->cost >= a->data.diadic.left->cost) {
                LinearizeExpr1(a->data.diadic.right, a, 0, 0);
                LinearizeExpr1(a->data.diadic.left, a, 0, 0);
            } else {
                LinearizeExpr1(a->data.diadic.left, a, 0, 0);
                LinearizeExpr1(a->data.diadic.right, a, 0, 0);
            }
            break;
        ENODE_CASE_ASSIGN:
            LinearizeExpr1(a->data.diadic.right, a, 0, 0);
            LinearizeExpr1(a->data.diadic.left, a, 0, 0);
            break;
        case ELAND:
        case ELOR:
            if (a->type == ELAND) {
                CLabel *label;
                Object *obj;
                CreateTempAssignmentToZero(a, &obj);
                LinearizeExpr1(a->data.diadic.left, a, 0, 0);
                TransformLogicalAndLHS(a, &obj, &label);
                LinearizeExpr1(a->data.diadic.right, a, 0, 0);
                TransformLogicalAndRHS(a, &obj, &label);
            } else if (a->type == ELOR) {
                CLabel *label;
                Object *obj;
                CreateTempAssignmentToOne(a, &obj);
                LinearizeExpr1(a->data.diadic.left, a, 0, 0);
                TransformLogicalOrLHS(a, &obj, &label);
                LinearizeExpr1(a->data.diadic.right, a, 0, 0);
                TransformLogicalOrRHS(a, &obj, &label);
            }
            break;
        case ECOND: {
            CLabel *label1, *label2;
            Object *obj;
            LinearizeExpr1(a->data.cond.cond, a, 0, 0);
            GenerateCondExpression(a, &label1);
            LinearizeExpr1(a->data.cond.expr1, a, 0, 0);
            GenerateExpr1TempAssignment(a, &obj);
            GenerateGoToStmt(a, &label2);
            GenerateLabel(&label1);
            LinearizeExpr1(a->data.cond.expr2, a, 0, 0);
            GenerateExpr2TempAssignment(a, &obj);
            GenerateLabel(&label2);
            if (!IS_TYPE_VOID(a->rtype)) {
                a->type = EINDIRECT;
                a->data.monadic = create_objectrefnode(obj);
                CError_ASSERT(1596, !IS_TYPE_VOID(a->rtype));
            } else {
                a->type = EINTCONST;
                a->data.intval = cint64_zero;
            }
            break;
        }
        case EPRECOMP: {
            Object *temp = GetTempFromtheList(a);
            a->type = EINDIRECT;
            a->data.monadic = create_objectrefnode(temp);
            CError_ASSERT(1614, !IS_TYPE_VOID(a->rtype));
            break;
        }
        case ENULLCHECK: {
            CLabel *label;
            Object *obj;
            LinearizeExpr1(a->data.nullcheck.nullcheckexpr, a, 0, 0);
            GenerateNullcheckExprTempAssignment(a, &obj);
            GenerateIfNotTemp(a, &obj, &label);
            LinearizeExpr1(a->data.nullcheck.condexpr, a, 0, 0);
            GenerateNullcheckCondExpr(a, &obj);
            GenerateLabel(&label);
            if (!IS_TYPE_VOID(a->rtype)) {
                a->type = EINDIRECT;
                a->data.monadic = create_objectrefnode(obj);
                CError_ASSERT(1639, !IS_TYPE_VOID(a->rtype));
            } else {
                a->type = EINTCONST;
                a->data.intval = cint64_zero;
            }
            break;
        }
        case EFUNCCALL:
        case EFUNCCALLP: {
            SInt32 count;
            SInt32 i;
            ENodeList *list;
            ENode **arr;
            SInt16 *arr2;

            IRO_IsLeafFunction = 0;

            list = a->data.funccall.args;
            count = 0;
            while (list) {
                list = list->next;
                count++;
            }

            if (count) {
                arr = oalloc(sizeof(ENode *) * count);
                list = a->data.funccall.args;
                count = 0;
                while (list) {
                    arr[count] = list->node;
                    list = list->next;
                    count++;
                }

                arr2 = oalloc(sizeof(SInt16) * count);
                for (i = 0; i < count; i++)
                    arr2[i] = count - i - 1;

                for (i = 0; i < count; i++)
                    LinearizeExpr1(arr[arr2[i]], a, 0, 0);
            }

            LinearizeExpr1(a->data.funccall.funcref, a, 0, 0);
            break;
        }

        case EINTCONST:
        case EFLOATCONST:
        case ESTRINGCONST:
        case EOBJREF:
        case ESETCONST:
        case EVECTOR128CONST:
            break;

        default:
            CError_FATAL(1723);
    }
}

static IROLinear *LinearizeExpr(ENode *enode) {
    IROLinear *linear = NULL;

    switch (enode->type) {
        ENODE_CASE_MONADIC:
            linear = IRO_NewLinear(IROLinearOp1Arg);
            linear->u.monadic = LinearizeExpr(enode->data.monadic);
            linear->nodetype = enode->type;
            linear->rtype = enode->rtype;
            linear->nodeflags = enode->flags;
            if (IRO_IsAssignOp[linear->nodetype])
                MarkAssigned(linear->u.monadic, 1);
            if (linear->nodetype == EINDIRECT) {
                MarkSubs1(linear->u.monadic);
                linear->u.monadic->flags |= IROLF_Immind | IROLF_Ind;
                if (IS_LINEAR_DIADIC(linear->u.monadic, EADD))
                    MarkSubscript(linear->u.monadic);
            }
            break;
        ENODE_CASE_DIADIC_1:
        case ECOMMA:
        case EPMODULO:
        case EROTL:
        case EROTR:
        case EBTST:
            linear = IRO_NewLinear(IROLinearOp2Arg);
            linear->nodeflags = enode->flags;
            if (!ENODE_IS(enode, ECOMMA) && enode->data.diadic.right->cost >= enode->data.diadic.left->cost) {
                linear->u.diadic.right = LinearizeExpr(enode->data.diadic.right);
                linear->u.diadic.left = LinearizeExpr(enode->data.diadic.left);
                linear->flags |= IROLF_8000;
            } else {
                linear->u.diadic.left = LinearizeExpr(enode->data.diadic.left);
                linear->u.diadic.right = LinearizeExpr(enode->data.diadic.right);
            }
            linear->nodetype = enode->type;
            linear->rtype = enode->rtype;
            if (IRO_IsAssignOp[linear->nodetype])
                MarkAssigned(linear->u.diadic.left, IRO_IsModifyOp[linear->nodetype]);
            break;
        ENODE_CASE_ASSIGN:
            linear = IRO_NewLinear(IROLinearOp2Arg);
            linear->nodeflags = enode->flags;
            linear->u.diadic.right = LinearizeExpr(enode->data.diadic.right);
            linear->u.diadic.left = LinearizeExpr(enode->data.diadic.left);
            linear->flags |= IROLF_8000;
            linear->nodetype = enode->type;
            linear->rtype = enode->rtype;
            MarkAssigned(linear->u.diadic.left, IRO_IsModifyOp[linear->nodetype]);
            break;
        case EINTCONST:
        case EFLOATCONST:
        case ESTRINGCONST:
        case EOBJREF:
        case EVECTOR128CONST:
            linear = IRO_NewLinear(IROLinearOperand);
            linear->nodeflags = enode->flags;
            linear->u.node = enode;
            linear->rtype = enode->rtype;
            break;
        case EFUNCCALL:
        case EFUNCCALLP: {
            SInt32 count;
            SInt32 i;
            ENodeList *list;
            ENode **arr;
            SInt16 *arr2;

            linear = IRO_NewLinear(IROLinearFunccall);
            linear->nodeflags = enode->flags;
            linear->u.funccall.ispascal = enode->type == EFUNCCALLP;

            list = enode->data.funccall.args;
            count = 0;
            while (list) {
                list = list->next;
                count++;
            }

            arr = NULL;
            if (count) {
                arr = oalloc(sizeof(ENode *) * count);
                list = enode->data.funccall.args;
                count = 0;
                while (list) {
                    arr[count] = list->node;
                    list = list->next;
                    count++;
                }

                arr2 = oalloc(sizeof(SInt16) * count);
                for (i = 0; i < count; i++)
                    arr2[i] = count - i - 1;

                for (i = 0; i < count; i++) {
                    arr[arr2[i]] = (ENode *) LinearizeExpr(arr[arr2[i]]);
                    MarkArgs((IROLinear *) arr[arr2[i]]);
                }
            }

            linear->u.funccall.argCount = count;
            linear->u.funccall.args = (IROLinear **) arr;
            linear->u.funccall.linear8 = LinearizeExpr(enode->data.funccall.funcref);
            linear->u.funccall.functype = enode->data.funccall.functype;
            linear->rtype = enode->rtype;
            break;
        }
        default:
            CError_FATAL(1943);
    }

    if (linear)
        LinkLinear(linear);
    return linear;
}

void IRO_PreLinearize(Statement *stmt) {
    IRO_FirstLinear = IRO_LastLinear = NULL;
    IRO_NumLinear = 0;
    CurrStmt = PrevStmt = NULL;

    while (stmt) {
        CurStat = stmt;
        CurrStmt = stmt;
        NullCheckList = NULL;

        switch (stmt->type) {
            case ST_NOP:
            case ST_LABEL:
            case ST_GOTO:
                break;
            case ST_OVF:
                CError_FATAL(1989);
            case ST_EXPRESSION:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_SWITCH:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_IFGOTO:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_IFNGOTO:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_RETURN:
                if (stmt->expr)
                    LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_BEGINCATCH:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_ENDCATCH:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;
            case ST_ENDCATCHDTOR:
                LinearizeExpr1(stmt->expr, NULL, 0, 0);
                break;

            case ST_EXIT:
            case ST_ENTRY:
            case ST_ASM:
                break;

            default:
                CError_FATAL(2038);
        }

        PrevStmt = stmt;
        stmt = stmt->next;
    }

    IRO_CheckForUserBreak();
}

static void MarkAllSubExprs(IROLinear *linear) {
    IROLinear *scan;
    int i;

    for (scan = linear; scan; scan = scan->next)
        scan->flags &= ~IROLF_Reffed;

    for (scan = linear; scan; scan = scan->next)
        MarkSubExpr(scan);
}

void IRO_Linearize(Statement *stmt) {
    IROLinear *linear;

    IRO_FirstLinear = IRO_LastLinear = NULL;
    IRO_NumLinear = 0;

    while (stmt) {
        CurStat = stmt;
        linear = NULL;

        switch (stmt->type) {
            case ST_NOP:
                linear = IRO_NewLinear(IROLinearNop);
                break;
            case ST_LABEL:
                linear = IRO_NewLinear(IROLinearLabel);
                linear->u.label.label = stmt->label;
                linear->flags |= IROLF_1;
                break;
            case ST_GOTO:
                linear = IRO_NewLinear(IROLinearGoto);
                linear->u.label.label = stmt->label;
                break;
            case ST_EXPRESSION:
                LinearizeExpr(stmt->expr);
                break;
            case ST_SWITCH:
                linear = IRO_NewLinear(IROLinearSwitch);
                linear->u.swtch.x4 = LinearizeExpr(stmt->expr);
                linear->u.swtch.info = (SwitchInfo *) stmt->label;
                break;
            case ST_IFGOTO:
                linear = IRO_NewLinear(IROLinearIf);
                linear->u.label.x4 = LinearizeExpr(stmt->expr);
                linear->u.label.label = stmt->label;
                break;
            case ST_IFNGOTO:
                linear = IRO_NewLinear(IROLinearIfNot);
                linear->u.label.x4 = LinearizeExpr(stmt->expr);
                linear->u.label.label = stmt->label;
                break;
            case ST_RETURN:
                IRO_FunctionHasReturn = 1;
                linear = IRO_NewLinear(IROLinearReturn);
                if (stmt->expr)
                    linear->u.monadic = LinearizeExpr(stmt->expr);
                else
                    linear->u.monadic = NULL;
                break;
            case ST_OVF:
                CError_FATAL(2143);
                break;
            case ST_EXIT:
                linear = IRO_NewLinear(IROLinearExit);
                linear->u.label.label = stmt->label;
                break;
            case ST_ENTRY:
                linear = IRO_NewLinear(IROLinearEntry);
                linear->u.label.label = stmt->label;
                linear->flags |= IROLF_1;
                break;
            case ST_BEGINCATCH:
                linear = IRO_NewLinear(IROLinearBeginCatch);
                linear->u.ctch.linear = LinearizeExpr(stmt->expr);
                linear->u.ctch.x4 = 0;
                linear->u.ctch.x8 = 0;
                break;
            case ST_ENDCATCH:
                linear = IRO_NewLinear(IROLinearEndCatch);
                linear->u.monadic = LinearizeExpr(stmt->expr);
                break;
            case ST_ENDCATCHDTOR:
                linear = IRO_NewLinear(IROLinearEndCatchDtor);
                linear->u.monadic = LinearizeExpr(stmt->expr);
                break;
            case ST_ASM:
                linear = IRO_NewLinear(IROLinearAsm);
                linear->u.asm_stmt = stmt;
                if (copts.optimizewithasm) {
                    IAEffects effects;
                    CodeGen_GetAsmEffects(stmt, &effects);
                    if (effects.x0 || effects.x3)
                        DisableDueToAsm = 1;
                } else {
                    DisableDueToAsm = 1;
                }
                break;
            default:
                CError_FATAL(2194);
        }

        if (linear)
            LinkLinear(linear);
        stmt = stmt->next;
    }

    linear = IRO_NewLinear(IROLinearEnd);
    linear->flags |= IROLF_1;
    LinkLinear(linear);

    MarkAllSubExprs(IRO_FirstLinear);
    IRO_CheckForUserBreak();
}

static Statement *NewStatement(IROLinear *linear, StatementType sttype) {
    Statement *stmt = lalloc(sizeof(Statement));
    memset(stmt, 0, sizeof(Statement));
    stmt->type = sttype;
    stmt->value = 1;
    if (linear->stmt) {
        stmt->dobjstack = linear->stmt->dobjstack;
        stmt->sourceoffset = linear->stmt->sourceoffset;
        stmt->sourcefilepath = linear->stmt->sourcefilepath;
        stmt->value = linear->stmt->value;
        stmt->flags = linear->stmt->flags;
    } else {
        stmt->sourceoffset = -1;
        stmt->sourcefilepath = NULL;
    }
    return stmt;
}

ENode *IRO_NewENode(ENodeType nodetype) {
    ENode *enode = lalloc(sizeof(ENode));
    memset(enode, 0, sizeof(ENode));
    enode->type = nodetype;
    return enode;
}

static ENode *BuildExpr(IROLinear *linear) {
    ENode *enode;

    switch (linear->type) {
        case IROLinearOperand:
            enode = IRO_NewENode(linear->u.node->type);
            enode->flags = linear->nodeflags;
            *enode = *linear->u.node;
            break;
        case IROLinearOp1Arg:
            enode = IRO_NewENode(linear->nodetype);
            enode->flags = linear->nodeflags;
            enode->data.monadic = BuildExpr(linear->u.monadic);
            enode->rtype = linear->rtype;
            enode->cost = enode->data.monadic->cost;
            if (!enode->cost)
                enode->cost = 1;
            break;
        case IROLinearOp2Arg:
            enode = IRO_NewENode(linear->nodetype);
            enode->flags = linear->nodeflags;
            enode->data.diadic.left = BuildExpr(linear->u.diadic.left);
            enode->data.diadic.right = BuildExpr(linear->u.diadic.right);

            enode->cost = enode->data.diadic.left->cost;
            if (enode->data.diadic.right->cost > enode->cost)
                enode->cost = enode->data.diadic.right->cost;
            else if (enode->data.diadic.right->cost == enode->cost)
                enode->cost += 1;

            if (ENODE_IS4(enode, ESHL, ESHR, EDIV, EMODULO))
                enode->cost += 2;
            if (enode->cost > 200)
                enode->cost = 200;

            enode->rtype = linear->rtype;
            break;
        case IROLinearOp3Arg:
            enode = IRO_NewENode(linear->nodetype);
            enode->flags = linear->nodeflags;
            enode->data.cond.cond = BuildExpr(linear->u.args3.a);
            enode->data.cond.expr1 = BuildExpr(linear->u.args3.b);
            enode->data.cond.expr2 = BuildExpr(linear->u.args3.c);
            enode->rtype = linear->rtype;

            enode->cost = enode->data.cond.cond->cost;
            if (enode->data.cond.expr1->cost > enode->cost)
                enode->cost = enode->data.cond.expr1->cost;
            if (enode->data.cond.expr2->cost > enode->cost)
                enode->cost = enode->data.cond.expr2->cost;
            enode->cost += 1;

            if (enode->cost > 200)
                enode->cost = 200;

            break;

        case IROLinearFunccall: {
            int i;
            enode = IRO_NewENode(linear->u.funccall.ispascal ? EFUNCCALLP : EFUNCCALL);
            enode->flags = linear->nodeflags;
            enode->data.funccall.funcref = BuildExpr(linear->u.funccall.linear8);
            enode->data.funccall.functype = linear->u.funccall.functype;
            enode->data.funccall.args = NULL;
            enode->cost = 200;
            for (i = linear->u.funccall.argCount - 1; i >= 0; i--) {
                ENodeList *list = lalloc(sizeof(ENodeList));
                list->node = BuildExpr(linear->u.funccall.args[i]);
                list->next = enode->data.funccall.args;
                enode->data.funccall.args = list;
            }
            enode->rtype = linear->rtype;
            break;
        }

        default:
            IRO_Dump("Oh, oh, bad expression type in BuildExpr at: %d\n", linear->index);
            CError_FATAL(2390);
    }

    enode->pointsTo = linear->pointsToFunction;
    return enode;
}

Statement *IRO_Delinearize(IRONode *node, IROLinear *linear) {
    IROLinear *scanlin;
    Statement *firstStmt;
    Statement *lastStmt;
    IRONode *scan;
    Statement *stmt;
    IRONode mynode;

    firstStmt = lastStmt = NULL;

    if (node) {
        scan = node;
        MarkAllSubExprs(IRO_FirstLinear);
    } else {
        memset(&mynode, 0, sizeof(IRONode));
        mynode.first = linear;
        scan = &mynode;
        MarkAllSubExprs(linear);
    }

    while (scan) {
        for (scanlin = scan->first; scanlin; scanlin = scanlin->next) {
            stmt = NULL;
            if (!(scanlin->flags & IROLF_Reffed)) {
                switch (scanlin->type) {
                    case IROLinearNop:
                        if (scan == node)
                            stmt = NewStatement(scanlin, ST_NOP);
                        else
                            stmt = NULL;
                        break;
                    case IROLinearOperand:
                    case IROLinearOp1Arg:
                    case IROLinearOp2Arg:
                    case IROLinearOp3Arg:
                    case IROLinearFunccall:
                        stmt = NewStatement(scanlin, ST_EXPRESSION);
                        stmt->expr = BuildExpr(scanlin);
                        break;
                    case IROLinearGoto:
                        stmt = NewStatement(scanlin, ST_GOTO);
                        stmt->label = scanlin->u.label.label;
                        break;
                    case IROLinearExit:
                        stmt = NewStatement(scanlin, ST_EXIT);
                        stmt->label = scanlin->u.label.label;
                        break;
                    case IROLinearIf:
                    case IROLinearIfNot:
                        stmt = NewStatement(scanlin, (scanlin->type == IROLinearIf) ? ST_IFGOTO : ST_IFNGOTO);
                        stmt->label = scanlin->u.label.label;
                        stmt->expr = BuildExpr(scanlin->u.label.x4);
                        break;
                    case IROLinearReturn:
                        stmt = NewStatement(scanlin, ST_RETURN);
                        if (scanlin->u.monadic)
                            stmt->expr = BuildExpr(scanlin->u.monadic);
                        break;
                    case IROLinearLabel:
                        stmt = NewStatement(scanlin, ST_LABEL);
                        stmt->label = scanlin->u.label.label;
                        stmt->label->stmt = stmt;
                        break;
                    case IROLinearEntry:
                        stmt = NewStatement(scanlin, ST_ENTRY);
                        stmt->label = scanlin->u.label.label;
                        stmt->label->stmt = stmt;
                        break;
                    case IROLinearSwitch:
                        stmt = NewStatement(scanlin, ST_SWITCH);
                        stmt->expr = BuildExpr(scanlin->u.swtch.x4);
                        stmt->label = (CLabel *) scanlin->u.swtch.info;
                        break;
                    case IROLinearBeginCatch:
                        stmt = NewStatement(scanlin, ST_BEGINCATCH);
                        stmt->expr = BuildExpr(scanlin->u.ctch.linear);
                        break;
                    case IROLinearEndCatch:
                        stmt = NewStatement(scanlin, ST_ENDCATCH);
                        stmt->expr = BuildExpr(scanlin->u.monadic);
                        break;
                    case IROLinearEndCatchDtor:
                        stmt = NewStatement(scanlin, ST_ENDCATCHDTOR);
                        stmt->expr = BuildExpr(scanlin->u.monadic);
                        break;
                    case IROLinearAsm:
                        stmt = scanlin->u.asm_stmt;
                        break;
                    case IROLinearEnd:
                        stmt = NULL;
                        break;
                    default:
                        CError_FATAL(2685);
                }

                if (stmt) {
                    if (LoopOptimizerRun) {
                        SInt32 i;
                        SInt32 value = 1;
                        for (i = 0; i < scan->loopdepth; i++) {
                            value = (value < 4096) ? (value * 8) : (value + 1);
                        }
                        stmt->value = value;
                    }
                    if (firstStmt)
                        lastStmt->next = stmt;
                    else
                        firstStmt = stmt;
                    lastStmt = stmt;
                }
            }
            if (scanlin == scan->last)
                break;
        }
        scan = scan->nextnode;
    }

    return firstStmt;
}

void IRO_RenumberInts(void) {
    IROLinear *linear = IRO_FirstLinear;
    IRO_NumLinear = 0;
    while (linear) {
        linear->index = IRO_NumLinear++;
        linear = linear->next;
    }
}

static void TravExprToUpdateFlags(IROLinear *linear) {
    int i;

    linear->flags &= ~(IROLF_Assigned | IROLF_8 | IROLF_Used | IROLF_Ind | IROLF_Subs | IROLF_LoopInvariant | IROLF_Ris | IROLF_Immind | IROLF_CouldError);
    switch (linear->type) {
        case IROLinearNop:
        case IROLinearOperand:
            break;
        case IROLinearOp1Arg:
            TravExprToUpdateFlags(linear->u.monadic);
            if (IRO_IsAssignOp[linear->nodetype])
                MarkAssigned(linear->u.monadic, 1);
            if (linear->nodetype == EINDIRECT) {
                MarkSubs1(linear->u.monadic);
                linear->u.monadic->flags |= IROLF_Immind | IROLF_Ind;
                if (IS_LINEAR_DIADIC(linear->u.monadic, EADD))
                    MarkSubscript(linear->u.monadic);
            }
            break;
        case IROLinearOp2Arg:
            TravExprToUpdateFlags(linear->u.diadic.left);
            TravExprToUpdateFlags(linear->u.diadic.right);
            if (IRO_IsAssignOp[linear->nodetype])
                MarkAssigned(linear->u.diadic.left, IRO_IsModifyOp[linear->nodetype]);
            break;
        case IROLinearOp3Arg:
            TravExprToUpdateFlags(linear->u.args3.a);
            TravExprToUpdateFlags(linear->u.args3.b);
            TravExprToUpdateFlags(linear->u.args3.c);
            break;
        case IROLinearFunccall:
            TravExprToUpdateFlags(linear->u.funccall.linear8);
            for (i = linear->u.funccall.argCount - 1; i >= 0; i--)
                TravExprToUpdateFlags(linear->u.funccall.args[i]);
            break;
        default:
            IRO_Dump("Oh, oh, bad expression type in TravExprToUpdateFlags at: %d\n", linear->index);
            CError_FATAL(2853);
    }
}

void IRO_UpdateFlagsOnInts(void) {
    IROLinear *linear;
    IRONode *node;

    MarkAllSubExprs(IRO_FirstLinear);

    for (node = IRO_FirstNode; node; node = node->nextnode) {
        for (linear = node->first; linear; linear = linear->next) {
            if (!(linear->flags & IROLF_Reffed)) {
                switch (linear->type) {
                    case IROLinearOperand:
                    case IROLinearOp1Arg:
                    case IROLinearOp2Arg:
                    case IROLinearOp3Arg:
                    case IROLinearFunccall:
                        TravExprToUpdateFlags(linear);
                        break;
                    case IROLinearIf:
                    case IROLinearIfNot:
                        TravExprToUpdateFlags(linear->u.label.x4);
                        break;
                    case IROLinearReturn:
                        if (linear->u.monadic)
                            TravExprToUpdateFlags(linear->u.monadic);
                        break;
                    case IROLinearSwitch:
                        TravExprToUpdateFlags(linear->u.swtch.x4);
                        break;
                    case IROLinearBeginCatch:
                        TravExprToUpdateFlags(linear->u.ctch.linear);
                        break;
                    case IROLinearEndCatch:
                        TravExprToUpdateFlags(linear->u.monadic);
                        break;
                    case IROLinearEndCatchDtor:
                        TravExprToUpdateFlags(linear->u.monadic);
                        break;
                    case IROLinearNop:
                    case IROLinearGoto:
                    case IROLinearLabel:
                    case IROLinearEntry:
                    case IROLinearExit:
                    case IROLinearAsm:
                    case IROLinearEnd:
                        break;
                    default:
                        CError_FATAL(2931);
                }
            }
            if (linear == node->last)
                break;
        }
    }
}

void IRO_SaveLinearIR(IROLinearIRSave *save) {
    save->firstLinear = IRO_FirstLinear;
    save->lastLinear = IRO_LastLinear;
    save->numLinear = IRO_NumLinear;
    save->curStat = CurStat;
    save->disableDueToAsm = DisableDueToAsm;
    save->isLeafFunction = IRO_IsLeafFunction;
    save->functionHasReturn = IRO_FunctionHasReturn;
    save->nullCheckList = NullCheckList;
    save->currStmt = CurrStmt;
    save->prevStmt = PrevStmt;
}

void IRO_RestoreLinearIR(IROLinearIRSave *save) {
    IRO_FirstLinear = save->firstLinear;
    IRO_LastLinear = save->lastLinear;
    IRO_NumLinear = save->numLinear;
    CurStat = save->curStat;
    DisableDueToAsm = save->disableDueToAsm;
    IRO_IsLeafFunction = save->isLeafFunction;
    IRO_FunctionHasReturn = save->functionHasReturn;
    NullCheckList = save->nullCheckList;
    CurrStmt = save->currStmt;
    PrevStmt = save->prevStmt;
}