Adding basic Database structure.

6 files changed, 362 insertions, 0 deletions

diff --git a/Database/internals/database-internal.cpp b/Database/internals/database-internal.cpp
new file mode 100644
index 0000000..0c90b71
--- /dev/null
+++ b/Database/internals/database-internal.cpp
@@ -0,0 +1,27 @@
+#include "database-internal.h"

+

+DatabaseCell::DatabaseCell(Cpu * cpu, Uint64 cpu_base, absolute_ptr origin, Uint32 size, Uint32 extra_size, DatabaseCell * prev, Database * parent) : cpu(cpu), next(0), prev(prev), parent(parent) {

+    prev->next = this;

+    parent->setEnd(this);

+    if (origin) {

+        Segment * origin_seg = parent->GetSegment(SEGID(origin));

+        segment = new Segment(size, cpu_base, parent->GetNextSegId(), extra_size, origin_seg->getPristineMemory() + SEGOFFSET(origin));

+    } else {

+        segment = new Segment(size, cpu_base, parent->GetNextSegId(), extra_size);

+    }

+}

+

+DatabaseCell::~DatabaseCell() {

+    if (parent->getEnd() == this)

+        parent->setEnd(prev);

+

+    if (parent->getStart() == this)

+        parent->setStart(next);

+

+    if (next)

+        next->prev = prev;

+    if (prev)

+        prev->next = next;

+

+    delete segment;

+}

diff --git a/Database/internals/database-internal.h b/Database/internals/database-internal.h
new file mode 100644
index 0000000..75e82c9
--- /dev/null
+++ b/Database/internals/database-internal.h
@@ -0,0 +1,39 @@
+#ifndef __DATABASE_INTERNAL_H__

+#define __DATABASE_INTERNAL_H__

+

+#include "database-segment.h"

+#include "database-types.h"

+

+class Database;

+class Cpu;

+

+/** A database element. Basically, the database is a collection of segments, associated with information.

+ * This class could have been merged with Segment's, but in an effort to split the segment, that only

+ * contains the raw memory, and the various data associated with it, this glue element exists. It'll also

+ * construct a linked list for the database.

+ */

+

+class DatabaseCell : public Base {

+  public:

+      /** The constructor of a DatabaseCell. Note that if you specify the origin parameter, 

+       * it'll create a sub-segment based on the first one. Note also that this doesn't support

+       * the patching system, yet.

+       */

+      DatabaseCell(Cpu * cpu, Uint64 cpu_base, absolute_ptr origin, Uint32 size, Uint32 extra_size, DatabaseCell * prev);

+      ~DatabaseCell();

+    Uint32 getID() { return segment->GetID(); }

+    void LoadMemory(Handle * src) { segment->LoadMemory(src); }

+    Segment * getSegment() { return segment; }

+    Cpu * getCpu() { return cpu; }

+    Uint64 getCpuBase() { return segment->getCpuBase(); }

+    absolute_ptr getOrigin() { return origin; }

+

+  private:

+    Segment * segment;

+    Cpu * cpu;

+    absolute_ptr origin; // a data segment can come from within another one

+    DatabaseCell * next, * prev;

+    Database * parent;

+};

+

+#endif

diff --git a/Database/internals/database-references.cpp b/Database/internals/database-references.cpp
new file mode 100644
index 0000000..8520f16
--- /dev/null
+++ b/Database/internals/database-references.cpp
@@ -0,0 +1,47 @@
+#include "database-references.h"

+

+RefFrom::RefFrom(RefTo * refTo, SegmentRefData * data) : refTo(refTo), data(data) {

+    assert(refto);

+    assert(data);

+    

+    next = data->getRefFrom();

+    prev = 0;

+    data->firstRefFrom = this;

+    if (next)

+        next->prev = this;

+}

+

+RefFrom::~RefFrom() {

+    if (next)

+        next->prev = prev;

+    if (prev)

+        prev->next = next;

+    else

+        data->setFirstRefFrom(next);

+}

+

+RefTo::RefTo(absolute_ptr ptr, SegmentRefData * data, Database * database) : data(data) {

+    assert(database);

+    Segment * destSeg = database->getSegment(ptr.segment_id);

+    assert(destSeg);

+    refFrom = new RefFrom(this, destSeg->getSegmentRefData(ptr.ptr);

+    

+    RefTo * t = data->getRefTo();

+    if (t) {

+        delete t;

+        data->setRefTo(this);

+    }

+}

+

+RefTo::~RefTo() {

+    data->refTo = 0;

+    delete refFrom;

+}

+

+SegmentRefData::SegmentRefData(Uint32 ptr, Segment * seg) : ptr(ptr), seg(seg) {

+    seg->setSegmentRefData(ptr, this);

+}

+

+SegmentRefData::~SegmentRefData() {

+    seg->setSegmentRefData(ptr, 0);

+}

diff --git a/Database/internals/database-references.h b/Database/internals/database-references.h
new file mode 100644
index 0000000..65e4cdf
--- /dev/null
+++ b/Database/internals/database-references.h
@@ -0,0 +1,58 @@
+#ifndef __DATABASE_REFERENCES_H__

+#define __DATABASE_REFERENCES_H__

+

+class SegmentData;

+class RefFrom;

+class RefTo;

+

+/** The reference system, where the database will be able to hold references from and to memory pointers.

+ */

+

+class RefFrom : public Base {

+  public:

+      RefFrom(RefTo * refTo, SegmentRefData * data);

+      ~RefFrom()

+    SegmentRefData * getRefSegData() { return refTo->getSegRefData(); }

+    SegmentRefData * getSegRefData() { return data; }

+    RefFrom * getNext() { return next; }

+  private:

+    RefTo * refTo;

+    RefFrom * next, * prev;

+    SegmentRefData * data;

+};

+

+class RefTo : public Base {

+  public:

+      RefTo(Uint32 ptr, SegmentRefData * data);

+      ~RefTo();

+    SegmentRefData * getRefSegData() { return refFrom->getSegRefData(); }

+    SegmentRefData * getSegRefData() { return data; }

+  private:

+    RefFrom * refFrom;

+    SegmentRefData * data;

+};

+

+class SegmentRefData : public Base {

+  public:

+      SegmentRefData(Uint32 ptr, Segment * seg);

+      ~SegmentRefData()

+    Uint32 getPtr() { return ptr; }

+    Segment * getSegment() { return seg; }

+    SegmentRefData * getSegmentRefData(Uint32 ptr) { return seg->getSegmentRefData(ptr); }

+    

+    RefTo * getRefTo() { return refTo; }

+    RefFrom * getRefFrom() { return firstRefFrom; }

+    

+    void setRefTo(RefTo * newRefTo) { refTo = newRefTo; checkDestroy(); }

+    void setFirstRefFrom(RefFrom * newFirstRefFrom) { firstRefFrom = newFirstRefFrom; checkDestroy(); }

+    

+  private:

+    RefTo * refTo;

+    RefFrom * firstRefFrom;

+    

+    Uint32 ptr;

+    Segment * seg;

+    void checkDestroy() { if (!refTo && !firstRefFrom) delete this; }

+};

+

+#endif

diff --git a/Database/internals/database-segment.cpp b/Database/internals/database-segment.cpp
new file mode 100644
index 0000000..4b94000
--- /dev/null
+++ b/Database/internals/database-segment.cpp
@@ -0,0 +1,119 @@
+#include "database-segment.h"

+

+Segment::Segment(Uint32 size, Uint32 id, Uint64 cpu_base, Uint32 extra_size, const Byte * data) : patches(0), plainmemory(0), size(size), extra_size(extra_size), id(id), cpu_base(cpu_base) {

+    Uint64 fullsize = size + extra_size;

+    

+    assert(size);

+    

+    if (data) {

+        plainmemory = (Byte *) data;

+        loaded = true;

+        allocated = false

+    } else {

+        plainmemory = Allocator<Byte>::alloc(size);

+        loaded = false;

+        allocated = true;

+    }

+    tags = Allocator<memory_tags_t>::alloc(fullsize);

+    refData = Allocator<SegmentRefData *>::alloc(fullsize);

+}

+

+Segment::~Segment() {

+    if (allocated)

+        Allocator<Byte>::free(plainmemory);

+    if (patches)

+        Allocator<Byte>::free(patches);

+    if (patchesmemory)

+        Allocator<Byte>::free(patchesmap);

+    Allocator<memory_tags_t>::free(tags);

+    Allocator<SegmentRefData *>::free(refData);

+}

+

+short Segment::Read(Uint32 ptr) {

+    if (ptr >= size) {

+        LOG(CONSOLE, ERROR, "Out of bound read attempt in segment %i at %08X\n", id, ptr);

+        return -1;

+    }

+    if (IsPatched(ptr))

+        return patches[ptr];

+    return plainmemory[ptr];

+}

+

+short Segment::RawRead(Uint32 ptr) {

+    if (ptr >= size) {

+        LOG(CONSOLE, ERROR, "Out of bound rawread attempt in segment %i at %08X\n", id, ptr);

+        return -1;

+    }

+    return plainmemory[ptr];

+}

+

+void Segment::Patch(Uint32 ptr, Byte val) {

+    if (!patchesmap) {

+        patches = Allocator<Byte>::alloc(size);

+        patchesmap = Allocator<Byte>::alloc((size << 3) + ((size & 7) ? 1 : 0));

+    }

+    if (ptr >= size) {

+        LOG(CONSOLE, ERROR, "Out of bound patch attempt in segment %i at %08X\n", id, ptr);

+        return;

+    }

+    patches[ptr] = val;

+    patchesmap[ptr / 8] |= (1 << ptr % 8);

+}

+

+void Segment::Restore(Uint32 ptr) {

+    if (!patchesmap)

+        return;

+    if (ptr >= size) {

+        LOG(CONSOLE, ERROR, "Out of bound patch attempt in segment %i at %08X\n", id, ptr);

+        return;

+    }

+    patchesmap[ptr / 8] &= ~(1 << (ptr % 8));

+}

+

+bool Segment::IsPatched(Uint32 ptr) {

+    if (!patchesmap)

+        return false;

+    return patchesmap[ptr / 8] & (1 << (ptr % 8));

+}

+

+void Segment::LoadMemory(Handle * src) {

+    if (loaded) {

+        LOG(CONSOLE, WARNING, "Memory segment already loaded, second attempt ignored.");

+        return;

+    }

+

+    src->Read(plainmemory, size);

+}

+

+void setTag(Uint32 ptr, memory_tags_t tag) {

+    if (ptr >= (size + extra_size)) {

+        LOG(CONSOLE, ERROR, "Out of bound setTag attempt in segment %i at %08X\n", id, ptr);

+        return;

+    }

+    tags[ptr] = tag;

+}

+

+memory_tags_t getTag(Uint32 ptr) {

+    if (ptr >= (size + extra_size)) {

+        memory_tags_t z = { 0, 0 };

+        LOG(CONSOLE, ERROR, "Out of bound getTag attempt in segment %i at %08X\n", id, ptr);

+        return z;

+    }

+    return tags[ptr];

+}

+

+SegmentRefData * Segment::getSegmentRefData(Uint32 ptr) {

+    if (ptr >= (size + extra_size)) {

+        LOG(CONSOLE, ERROR, "Out of bound getSegmentRefData attempt in segment %i at %08X\n", id, ptr);

+        return 0;

+    }

+    return refData[ptr];

+}

+

+void Segment::setSegmentRefData(Uint32 ptr, SegmentRefData * data) {

+    if (ptr >= (size + extra_size)) {

+        LOG(CONSOLE, ERROR, "Out of bound setSegmentRefData attempt in segment %i at %08X\n", id, ptr);

+        return;

+    }

+    refData[ptr] = data;

+}

diff --git a/Database/internals/database-segment.h b/Database/internals/database-segment.h
new file mode 100644
index 0000000..72086a7
--- /dev/null
+++ b/Database/internals/database-segment.h
@@ -0,0 +1,72 @@
+#ifndef __DATABASE_SEGMENT_H__

+#define __DATABASE_SEGMENT_H__

+

+#include "database-types.h"

+

+class SegmentRefData;

+

+/**

+ * The Segment class that holds the memory and patches for a memory segment.

+ *

+ * This class will passively hold the memory for a segment memory. The tags

+ * corresponding to each byte are also stored there. The patches are optionnal,

+ * and will only be allocated if a patch is actually done.

+ *

+ * TODO: do in-memory hollow structure for the tags.

+ */

+

+class Segment : public Base {

+  public:

+      /**

+       * Main constructor.

+       *

+       * @param size is the real data size of this segment.

+       * @param id is the static id for that data segment.

+       * @param cpu_base is the base absolute physical address for that segment in the cpu's flat memory.

+       * @param extra_size gives the size of the uninitialized memory at the end of the segment, typically the bss part.

+       * @param data optionally holds the memory to use for this segment. If it's provided, the caller MUST NOT free it, as it's going to be used directly.

+       */

+      Segment(Uint32 size, Uint32 id, Uint64 cpu_base, Uint32 extra_size = 0, const Byte * data = 0);

+      ~Segment();

+    Uint32 getId() { return id; }

+    /** Will return the byte for that pointer in the segment. May be patched.

+     * @param ptr is the pointer for the byte to be retrieved.

+     * @return the byte read, or -1 if it's inside the BSS part, or outside the whole segment.

+     */

+    short Read(Uint32 ptr);

+    /** Will return the byte for that pointer in the segment. Will NOT be patched.

+     * @param ptr is the pointer for the byte to be retrieved.

+     * @return the byte read, or -1 if it's inside the BSS part, or outside the whole segment.

+     */

+    short RawRead(Uint32 ptr);

+    /** In case you need to read the (unpatched) memory block.

+     * @return the memory block of the segment.

+     */

+    const Byte * getPristineMemory() { return plainmemory; }

+    void Patch(Uint32 ptr, Byte val);

+    void Restore(Uint32 ptr);

+    bool IsPatched(Uint32 ptr);

+    bool IsLoaded() { return loaded; }

+    /** Will load the memory segment with the provided Handle; will

+     * only work if you didn't provide data during the constructor.

+     * @see Segment()

+     */

+    void LoadMemory(Handle * src);

+    void setTag(Uint32 ptr, memory_tags_t tag);

+    memory_tags_t getTag(Uint32 ptr);

+    Uint32 getSize() { return size; }

+    Uint64 getFullSize() { return size + extra_size; }

+    Uint64 getCpuBase() { return cpu_base; }

+    SegmentRefData * getSegmentRefData(Uint32 ptr);

+    void setSegmentRefData(Uint32 ptr, SegmentRefData * data);

+  private:

+    Byte * plainmemory, * patches, * patchesmap;

+    SegmentRefData ** refData;

+    memory_tags_t * tags;

+    bool loaded, allocated;

+    Uint32 size, extra_size;

+    Uint32 id;

+    Uint64 cpu_base;

+}

+

+#endif