MWCC/compiler_and_linker/unsorted/UseDefChains.c

#include "compiler/UseDefChains.h"
#include "compiler/Alias.h"
#include "compiler/BitVectors.h"
#include "compiler/CompilerTools.h"
#include "compiler/PCode.h"
#include "compiler/Registers.h"
#include "compiler/objects.h"
#include "compiler/types.h"

int number_of_Defs;
UseOrDef *Defs;
RegUseOrDef **reg_Defs[RegClassMax];
int number_of_Uses;
UseOrDef *Uses;
RegUseOrDef **reg_Uses[RegClassMax];
UseDefInfo *usedefinfo;
ObjectUseDef *objectusedefs;
ObjectUseDef *objectusedeflist;

ObjectUseDef *findobjectusedef(Object *object) {
    ObjectUseDef *oud;

    oud = objectusedefs;
    while (oud) {
        if (((unsigned long) object) < ((unsigned long) oud->object))
            oud = oud->leftchild;
        else if (((unsigned long) object) > ((unsigned long) oud->object))
            oud = oud->rightchild;
        else
            return oud;
    }

    return NULL;
}

static void addobjectusedef(Object *object) {
    ObjectUseDef **ptr;
    ObjectUseDef *list;

    ptr = &objectusedefs;
    while (*ptr) {
        if (((unsigned long) object) < ((unsigned long) (*ptr)->object))
            ptr = &(*ptr)->leftchild;
        else if (((unsigned long) object) > ((unsigned long) (*ptr)->object))
            ptr = &(*ptr)->rightchild;
        else
            return;
    }

    list = oalloc(sizeof(ObjectUseDef));
    list->leftchild = list->rightchild = NULL;
    list->object = object;
    list->uses = list->defs = NULL;
    list->next = objectusedeflist;
    objectusedeflist = list;
    *ptr = list;
}

static void addaliasusedef(Alias *alias) {
    AliasMember *member;

    if (alias && alias != worst_case) {
        if (alias->type == AliasType2) {
            for (member = alias->parents; member; member = member->nextParent)
                addaliasusedef(member->child);
        } else {
            addobjectusedef(alias->object);
        }
    }
}

static void addworstcase(void) {
    addobjectusedef(&worst_case_obj);
}

static void precomputememoryusedefs(void) {
    PCodeBlock *block;
    PCode *pcode;

    objectusedeflist = NULL;
    objectusedefs = NULL;

    for (block = pcbasicblocks; block; block = block->nextBlock) {
        for (pcode = block->firstPCode; pcode; pcode = pcode->nextPCode) {
            if (pcode->flags & (fIsRead | fIsWrite)) {
                if (pcode->alias) {
                    if (pcode->alias->type == AliasType2 || pcode->alias->size != nbytes_loaded_or_stored_by(pcode))
                        pcode->flags |= fIsPtrOp;
                    addaliasusedef(pcode->alias);
                } else {
                    pcode->flags |= fIsPtrOp;
                }
            }
        }
    }

    addworstcase();
}

static void precomputeusedefcounts(int flag) {
    PCodeBlock *block;
    PCode *pcode;
    PCodeArg *op;
    int i;
    ObjectUseDef *oud;

    number_of_Defs = 0;
    number_of_Uses = 0;

    for (block = pcbasicblocks; block; block = block->nextBlock) {
        for (pcode = block->firstPCode; pcode; pcode = pcode->nextPCode) {
            if (!(pcode->flags & fIsBranch) && pcode->argCount) {
                pcode->useID = number_of_Uses;
                pcode->defID = number_of_Defs;
                op = pcode->args;
                i = pcode->argCount;
                while (i--) {
                    if (op->kind == PCOp_REGISTER && op->data.reg.reg >= n_real_registers[op->arg]) {
                        if (op->data.reg.effect & EffectRead)
                            number_of_Uses++;
                        if (op->data.reg.effect & EffectWrite)
                            number_of_Defs++;
                    }
                    op++;
                }

                if (flag) {
                    if (pcode->flags & fIsRead) {
                        if (pcode->flags & fIsPtrOp) {
                            for (oud = objectusedeflist; oud; oud = oud->next) {
                                if (may_alias_object(pcode, oud->object))
                                    number_of_Uses++;
                            }
                        } else {
                            number_of_Uses++;
                        }
                    } else if (pcode->flags & fIsWrite) {
                        if (pcode->flags & fIsPtrOp) {
                            for (oud = objectusedeflist; oud; oud = oud->next) {
                                if (may_alias_object(pcode, oud->object))
                                    number_of_Defs++;
                            }
                        } else {
                            number_of_Defs++;
                        }
                    } else if (pcode->flags & fIsCall) {
                        for (oud = objectusedeflist; oud; oud = oud->next) {
                            if (
                                oud->object->datatype == DDATA ||
                                oud->object->datatype == DNONLAZYPTR ||
                                (oud->object->datatype == DLOCAL && (
                                    oud->object->u.var.info->noregister ||
                                    IS_TYPE_ARRAY(oud->object->type) ||
                                    IS_TYPE_NONVECTOR_STRUCT(oud->object->type) ||
                                    IS_TYPE_CLASS(oud->object->type) ||
                                    IS_TYPE_12BYTES_MEMBERPOINTER(oud->object->type)
                                    ))
                                ) {
                                number_of_Uses++;
                                number_of_Defs++;
                            }
                        }
                    }
                }
            }
        }
    }
}

static void computeusedeflists(int flag) {
    ObjectUseDef *oud;
    RegUseOrDef *list;
    PCodeBlock *block;
    PCode *pcode;
    PCodeArg *op;
    int i;
    UseOrDef *use;
    UseOrDef *def;
    int useID;
    int defID;
    ObjectUseDef *tmp;
    Object *object;

    Uses = oalloc(sizeof(UseOrDef) * number_of_Uses);
    Defs = oalloc(sizeof(UseOrDef) * number_of_Defs);

    reg_Uses[RegClass_GPR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_GPR]);
    reg_Defs[RegClass_GPR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_GPR]);
    for (i = 0; i < used_virtual_registers[RegClass_GPR]; i++) {
        reg_Uses[RegClass_GPR][i] = NULL;
        reg_Defs[RegClass_GPR][i] = NULL;
    }

    reg_Uses[RegClass_FPR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_FPR]);
    reg_Defs[RegClass_FPR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_FPR]);
    for (i = 0; i < used_virtual_registers[RegClass_FPR]; i++) {
        reg_Uses[RegClass_FPR][i] = NULL;
        reg_Defs[RegClass_FPR][i] = NULL;
    }

    reg_Uses[RegClass_VR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_VR]);
    reg_Defs[RegClass_VR] = oalloc(sizeof(RegUseOrDef *) * used_virtual_registers[RegClass_VR]);
    for (i = 0; i < used_virtual_registers[RegClass_VR]; i++) {
        reg_Uses[RegClass_VR][i] = NULL;
        reg_Defs[RegClass_VR][i] = NULL;
    }

    for (block = pcbasicblocks; block; block = block->nextBlock) {
        for (pcode = block->firstPCode; pcode; pcode = pcode->nextPCode) {
            if (!(pcode->flags & fIsBranch) && pcode->argCount) {
                use = &Uses[useID = pcode->useID];
                def = &Defs[defID = pcode->defID];

                op = pcode->args;
                i = pcode->argCount;
                while (i--) {
                    if (op->kind == PCOp_REGISTER && op->data.reg.reg >= n_real_registers[op->arg]) {
                        if (op->data.reg.effect & EffectRead) {
                            use->pcode = pcode;
                            use->v.kind = op->kind;
                            use->v.arg = op->arg;
                            use->v.u.reg = op->data.reg.reg;
                            list = oalloc(sizeof(RegUseOrDef));
                            list->id = useID;
                            list->next = reg_Uses[op->arg][op->data.reg.reg];
                            reg_Uses[op->arg][op->data.reg.reg] = list;
                            use++;
                            useID++;
                        }
                        if (op->data.reg.effect & EffectWrite) {
                            def->pcode = pcode;
                            def->v.kind = op->kind;
                            def->v.arg = op->arg;
                            def->v.u.reg = op->data.reg.reg;
                            list = oalloc(sizeof(RegUseOrDef));
                            list->id = defID;
                            list->next = reg_Defs[op->arg][op->data.reg.reg];
                            reg_Defs[op->arg][op->data.reg.reg] = list;
                            def++;
                            defID++;
                        }
                    }
                    op++;
                }

                if (flag) {
                    if (pcode->flags & fIsRead) {
                        if (pcode->flags & fIsPtrOp) {
                            for (oud = objectusedeflist; oud; oud = oud->next) {
                                if (may_alias_object(pcode, object = oud->object)) {
                                    use->pcode = pcode;
                                    use->v.kind = PCOp_MEMORY;
                                    use->v.arg = 1;
                                    use->v.u.object = object;
                                    list = oalloc(sizeof(RegUseOrDef));
                                    list->id = useID;
                                    list->next = oud->uses;
                                    oud->uses = list;
                                    use++;
                                    useID++;
                                }
                            }
                        } else {
                            object = pcode->alias->object;
                            use->pcode = pcode;
                            use->v.kind = PCOp_MEMORY;
                            use->v.arg = 0;
                            use->v.u.object = object;
                            list = oalloc(sizeof(RegUseOrDef));
                            list->id = useID;
                            tmp = findobjectusedef(object);
                            list->next = tmp->uses;
                            tmp->uses = list;
                        }
                    } else if (pcode->flags & fIsWrite) {
                        if (pcode->flags & fIsPtrOp) {
                            for (oud = objectusedeflist; oud; oud = oud->next) {
                                if (may_alias_object(pcode, object = oud->object)) {
                                    def->pcode = pcode;
                                    def->v.kind = PCOp_MEMORY;
                                    def->v.arg = 1;
                                    def->v.u.object = object;
                                    list = oalloc(sizeof(RegUseOrDef));
                                    list->id = defID;
                                    list->next = oud->defs;
                                    oud->defs = list;
                                    def++;
                                    defID++;
                                }
                            }
                        } else {
                            object = pcode->alias->object;
                            def->pcode = pcode;
                            def->v.kind = PCOp_MEMORY;
                            def->v.arg = 0;
                            def->v.u.object = object;
                            list = oalloc(sizeof(RegUseOrDef));
                            list->id = useID;
                            tmp = findobjectusedef(object);
                            list->next = tmp->defs;
                            tmp->defs = list;
                        }
                    } else if (pcode->flags & fIsCall) {
                        for (oud = objectusedeflist; oud; oud = oud->next) {
                            object = oud->object;
                            if (
                                object->datatype == DDATA ||
                                object->datatype == DNONLAZYPTR ||
                                (object->datatype == DLOCAL && (
                                    object->u.var.info->noregister ||
                                    IS_TYPE_ARRAY(object->type) ||
                                    IS_TYPE_NONVECTOR_STRUCT(object->type) ||
                                    IS_TYPE_CLASS(oud->object->type) ||
                                    IS_TYPE_12BYTES_MEMBERPOINTER(object->type)
                                ))
                                ) {
                                use->pcode = pcode;
                                use->v.kind = PCOp_MEMORY;
                                use->v.arg = 1;
                                use->v.u.object = object;

                                list = oalloc(sizeof(RegUseOrDef));
                                list->id = useID;
                                list->next = oud->uses;
                                oud->uses = list;

                                def->pcode = pcode;
                                def->v.kind = PCOp_MEMORY;
                                def->v.arg = 1;
                                def->v.u.object = object;

                                use++;
                                useID++;

                                list = oalloc(sizeof(RegUseOrDef));
                                list->id = defID;
                                list->next = oud->defs;
                                oud->defs = list;

                                def++;
                                defID++;
                            }
                        }
                    }
                }
            }
        }
    }
}

static void allocateusedefinfo(void) {
    UseDefInfo *info;
    int i;

    usedefinfo = oalloc(pcblockcount * sizeof(UseDefInfo));
    for (i = 0, info = usedefinfo; i < pcblockcount; i++, info++) {
        info->defvec0 = oalloc(4 * ((number_of_Defs + 31) >> 5));
        info->defvec4 = oalloc(4 * ((number_of_Defs + 31) >> 5));
        info->defvec8 = oalloc(4 * ((number_of_Defs + 31) >> 5));
        info->defvecC = oalloc(4 * ((number_of_Defs + 31) >> 5));
        info->usevec10 = oalloc(4 * ((number_of_Uses + 31) >> 5));
        info->usevec14 = oalloc(4 * ((number_of_Uses + 31) >> 5));
        info->usevec18 = oalloc(4 * ((number_of_Uses + 31) >> 5));
        info->usevec1C = oalloc(4 * ((number_of_Uses + 31) >> 5));
    }
}

static void computelocalusedefinfo(void) {
    PCodeBlock *block; // r28
    PCode *pcode; // r27
    UInt32 *defvec0; // r26
    UInt32 *defvec4; // r25
    UInt32 *usevec10; // r24
    UInt32 *usevec14; // r23
    UseOrDef *use; // r22
    UseOrDef *def; // r22
    int useID; // r15
    int defID; // r21
    ObjectUseDef *oud; // r17
    RegUseOrDef *list; // r16
    UseDefInfo *info; // r15

    for (block = pcbasicblocks; block; block = block->nextBlock) {
        info = &usedefinfo[block->blockIndex];
        defvec0 = info->defvec0;
        defvec4 = info->defvec4;
        usevec10 = info->usevec10;
        usevec14 = info->usevec14;
        bitvectorinitialize(defvec0, number_of_Defs, 0);
        bitvectorinitialize(defvec4, number_of_Defs, 0);
        bitvectorinitialize(usevec10, number_of_Uses, 0);
        bitvectorinitialize(usevec14, number_of_Uses, 0);
        bitvectorinitialize(info->defvec8, number_of_Defs, 0);
        bitvectorinitialize(info->defvecC, number_of_Defs, 0);
        bitvectorinitialize(info->usevec18, number_of_Uses, 0);
        bitvectorinitialize(info->usevec1C, number_of_Uses, 0);

        for (pcode = block->firstPCode; pcode; pcode = pcode->nextPCode) {
            if (!(pcode->flags & fIsBranch) && pcode->argCount) {
                for (use = &Uses[useID = pcode->useID]; useID < number_of_Uses && use->pcode == pcode; use++, useID++) {
                    bitvectorsetbit(useID, usevec10);
                    if (use->v.kind == PCOp_REGISTER) {
                        for (list = reg_Defs[use->v.arg][use->v.u.reg]; list; list = list->next) {
                            if (bitvectorgetbit(list->id, defvec0))
                                bitvectorclearbit(useID, usevec10);
                        }
                    } else {
                        for (list = findobjectusedef(use->v.u.object)->defs; list; list = list->next) {
                            if (uniquely_aliases(pcode, Defs[list->id].pcode)) {
                                if (Defs[list->id].v.arg == 0 && bitvectorgetbit(list->id, defvec0))
                                    bitvectorclearbit(useID, usevec10);
                            }
                        }
                    }
                }

                for (def = &Defs[defID = pcode->defID]; defID < number_of_Defs && def->pcode == pcode; def++, defID++) {
                    if (def->v.kind == PCOp_REGISTER) {
                        for (list = reg_Uses[def->v.arg][def->v.u.reg]; list; list = list->next) {
                            if (Uses[list->id].pcode->block != block)
                                bitvectorsetbit(list->id, usevec14);
                        }
                        for (list = reg_Defs[def->v.arg][def->v.u.reg]; list; list = list->next) {
                            if (Defs[list->id].pcode->block != block)
                                bitvectorsetbit(list->id, defvec4);
                            else
                                bitvectorclearbit(list->id, defvec0);
                        }
                    } else if (def->v.arg == 0) {
                        oud = findobjectusedef(use->v.u.object);
                        for (list = oud->uses; list; list = list->next) {
                            if (may_alias(pcode, Uses[list->id].pcode)) {
                                if (Uses[list->id].pcode->block != block)
                                    bitvectorsetbit(list->id, usevec14);
                            }
                        }
                        for (list = oud->defs; list; list = list->next) {
                            if (uniquely_aliases(pcode, Defs[list->id].pcode)) {
                                if (Defs[list->id].pcode->block != block)
                                    bitvectorsetbit(list->id, defvec4);
                                else
                                    bitvectorclearbit(list->id, defvec0);
                            }
                        }
                    }

                    bitvectorsetbit(defID, defvec0);
                }
            }
        }
    }
}

static void computeglobalusedefinfo(void) {
    UseDefInfo *udi;
    UInt32 *defVec0;
    UInt32 *defVec4;
    UInt32 *defVec8;
    UInt32 *defVecC;
    int bitvecsize;
    int i;
    int j;
    int flag;
    PCLink *preds;
    UInt32 val;

    bitvecsize = (number_of_Defs + 31) >> 5;
    flag = 1;
    while (flag) {
        flag = 0;
        for (i = 0; i < pcblockcount; i++) {
            if (depthfirstordering[i]) {
                udi = &usedefinfo[depthfirstordering[i]->blockIndex];
                if ((preds = depthfirstordering[i]->predecessors)) {
                    defVec8 = udi->defvec8;
                    bitvectorcopy(defVec8, usedefinfo[preds->block->blockIndex].defvecC, number_of_Defs);
                    for (preds = preds->nextLink; preds; preds = preds->nextLink)
                        bitvectorunion(defVec8, usedefinfo[preds->block->blockIndex].defvecC, number_of_Defs);
                }

                defVecC = udi->defvecC;
                defVec8 = udi->defvec8;
                defVec0 = udi->defvec0;
                defVec4 = udi->defvec4;
                for (j = 0; j < bitvecsize; j++) {
                    val = *defVec0 | (*defVec8 & ~*defVec4);
                    if (val != *defVecC) {
                        *defVecC = val;
                        flag = 1;
                    }
                    defVec8++;
                    defVecC++;
                    defVec4++;
                    defVec0++;
                }
            }
        }
    }
}

static void computeglobaldefuseinfo(void) {
    UseDefInfo *udi;
    UInt32 *useVec10;
    UInt32 *useVec14;
    UInt32 *useVec18;
    UInt32 *useVec1C;
    int bitvecsize;
    int i;
    int j;
    int flag;
    PCLink *succs;
    UInt32 val;
    PCodeBlock *block;

    bitvecsize = (number_of_Uses + 31) >> 5;
    flag = 1;
    while (flag) {
        flag = 0;
        i = pcblockcount;
        while (i) {
            if ((block = depthfirstordering[--i])) {
                udi = &usedefinfo[block->blockIndex];
                if ((succs = block->successors)) {
                    useVec1C = udi->usevec1C;
                    bitvectorcopy(useVec1C, usedefinfo[succs->block->blockIndex].usevec18, number_of_Uses);
                    for (succs = succs->nextLink; succs; succs = succs->nextLink)
                        bitvectorunion(useVec1C, usedefinfo[succs->block->blockIndex].usevec18, number_of_Uses);
                }

                useVec1C = udi->usevec1C;
                useVec18 = udi->usevec18;
                useVec10 = udi->usevec10;
                useVec14 = udi->usevec14;
                for (j = 0; j < bitvecsize; j++) {
                    val = *useVec10 | (*useVec1C & ~*useVec14);
                    if (val != *useVec18) {
                        *useVec18 = val;
                        flag = 1;
                    }
                    useVec18++;
                    useVec1C++;
                    useVec14++;
                    useVec10++;
                }
            }
        }
    }
}

void computeusedefchains(int flag) {
    if (flag) {
        gather_alias_info();
        precomputememoryusedefs();
    }

    precomputeusedefcounts(flag);
    computeusedeflists(flag);
    allocateusedefinfo();
    computelocalusedefinfo();
    computedepthfirstordering();
    computeglobalusedefinfo();
    computeglobaldefuseinfo();
}