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Limit Disassembly scrolling from 0 and RVA_MAX

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This commit is contained in:
Florian Märkl 2018-04-15 19:06:05 +02:00
parent b8594e3bf5
commit 6934d785f4
1 changed files with 41 additions and 26 deletions
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41
src/widgets/DisassemblyWidget.cpp
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@ -205,31 +205,34 @@ void DisassemblyWidget::refreshDisasm(RVA offset)
mDisasTextEdit->document()->clear();
QTextCursor cursor(mDisasTextEdit->document());
for (DisassemblyLine line : disassemblyLines) {
if (line.offset < topOffset) { // overflow
break;
}
cursor.insertHtml(line.text);
auto a = new DisassemblyTextBlockUserData(line);
cursor.block().setUserData(a);
cursor.insertBlock();
}
// get bottomOffset from last visible line.
// because pd N may return more than N lines, move maxLines lines down from the top
mDisasTextEdit->moveCursor(QTextCursor::Start);
QTextCursor tc = mDisasTextEdit->textCursor();
tc.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor, maxLines - 1);
mDisasTextEdit->setTextCursor(tc);
connectCursorPositionChanged(false);
bottomOffset = readCurrentDisassemblyOffset();
if (bottomOffset == RVA_INVALID) {
if (!disassemblyLines.isEmpty()) {
bottomOffset = disassemblyLines[qMin(disassemblyLines.size(), maxLines) - 1].offset;
if (bottomOffset < topOffset) {
bottomOffset = RVA_MAX;
}
} else {
bottomOffset = topOffset;
}
// remove additional lines
QTextCursor tc = mDisasTextEdit->textCursor();
tc.movePosition(QTextCursor::Start);
tc.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor, maxLines - 1);
tc.movePosition(QTextCursor::EndOfLine);
tc.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
tc.removeSelectedText();
connectCursorPositionChanged(false);
updateCursorPosition();
mDisasTextEdit->setLockScroll(false);
@ -246,8 +249,14 @@ void DisassemblyWidget::scrollInstructions(int count)
RVA offset;
if (count > 0) {
offset = Core()->nextOpAddr(topOffset, count);
if (offset < topOffset) {
offset = RVA_MAX;
}
} else {
offset = Core()->prevOpAddr(topOffset, -count);
if (offset > topOffset) {
offset = 0;
}
}
refreshDisasm(offset);
@ -435,9 +444,14 @@ void DisassemblyWidget::moveCursorRelative(bool up, bool page)
RVA offset;
if (!up) {
offset = Core()->nextOpAddr(bottomOffset, 1);
if (offset < bottomOffset) {
offset = RVA_MAX;
}
} else {
offset = Core()->prevOpAddr(topOffset, maxLines);
if (offset > topOffset) {
offset = 0;
} else {
// disassembly from calculated offset may have more than maxLines lines
// move some instructions down if necessary.
@ -458,6 +472,7 @@ void DisassemblyWidget::moveCursorRelative(bool up, bool page)
offset = lines[overflowLines].offset;
}
}
}
refreshDisasm(offset);
} else { // normal arrow keys
int blockCount = mDisasTextEdit->blockCount();
@ -519,7 +534,7 @@ void DisassemblyWidget::on_seekChanged(RVA offset)
cursorLineOffset = 0;
}
if (topOffset != RVA_INVALID && bottomOffset != RVA_INVALID
if (topOffset != RVA_INVALID
&& offset >= topOffset && offset <= bottomOffset) {
// if the line with the seek offset is currently visible, just move the cursor there
updateCursorPosition();