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222 lines
8.8 KiB
Plaintext
222 lines
8.8 KiB
Plaintext
lldb debugging functionality for Gecko
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======================================
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This directory contains a module, lldbutils, which is imported by the
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in-tree .lldbinit file. The lldbutil modules define some lldb commands
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that are handy for debugging Gecko.
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If you want to add a new command or Python-implemented type summary, either add
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it to one of the existing broad area Python files (such as lldbutils/layout.py
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for layout-related commands) or create a new file if none of the existing files
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is appropriate. If you add a new file, make sure you add it to __all__ in
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lldbutils/__init__.py.
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Supported commands
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------------------
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Most commands below that can take a pointer to an object also support being
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called with a smart pointer like nsRefPtr or nsCOMPtr.
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* frametree EXPR, ft EXPR
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frametreelimited EXPR, ftl EXPR
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Shows information about a frame tree. EXPR is an expression that
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is evaluated, and must be an nsIFrame*. frametree displays the
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entire frame tree that contains the given frame. frametreelimited
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displays a subtree of the frame tree rooted at the given frame.
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(lldb) p this
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(nsBlockFrame *) $4 = 0x000000011687fcb8
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(lldb) ftl this
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Block(div)(-1)@0x11687fcb8 {0,0,7380,690} [state=0002100000d04601] [content=0x11688c0c0] [sc=0x11687f990:-moz-scrolled-content]<
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line 0x116899130: count=1 state=inline,clean,prevmarginclean,not impacted,not wrapped,before:nobr,after:nobr[0x100] {60,0,0,690} vis-overflow=60,510,0,0 scr-overflow=60,510,0,0 <
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Text(0)""@0x1168990c0 {60,510,0,0} [state=0001000020404000] [content=0x11687ca10] [sc=0x11687fd88:-moz-non-element,parent=0x11687eb00] [run=0x115115e80][0,0,T]
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>
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>
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(lldb) ft this
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Viewport(-1)@0x116017430 [view=0x115efe190] {0,0,60,60} [state=000b063000002623] [sc=0x1160170f8:-moz-viewport]<
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HTMLScroll(html)(-1)@0x1160180d0 {0,0,0,0} [state=000b020000000403] [content=0x115e4d640] [sc=0x116017768:-moz-viewport-scroll]<
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...
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Canvas(html)(-1)@0x116017e08 {0,0,60,60} vis-overflow=0,0,8340,2196 scr-overflow=0,0,8220,2196 [state=000b002000000601] [content=0x115e4d640] [sc=0x11687e0f8:-moz-scrolled-canvas]<
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Block(html)(-1)@0x11687e578 {0,0,60,2196} vis-overflow=0,0,8340,2196 scr-overflow=0,0,8220,2196 [state=000b100000d00601] [content=0x115e4d640] [sc=0x11687e4b8,parent=0x0]<
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line 0x11687ec48: count=1 state=block,clean,prevmarginclean,not impacted,not wrapped,before:nobr,after:nobr[0x48] bm=480 {480,480,0,1236} vis-overflow=360,426,7980,1410 scr-overflow=480,480,7740,1236 <
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Block(body)(1)@0x11687ebb0 {480,480,0,1236} vis-overflow=-120,-54,7980,1410 scr-overflow=0,0,7740,1236 [state=000b120000100601] [content=0x115ed8980] [sc=0x11687e990]<
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line 0x116899170: count=1 state=inline,clean,prevmarginclean,not impacted,not wrapped,before:nobr,after:nobr[0x0] {0,0,7740,1236} vis-overflow=-120,-54,7980,1410 scr-overflow=0,0,7740,1236 <
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nsTextControlFrame@0x11687f068 {0,66,7740,1170} vis-overflow=-120,-120,7980,1410 scr-overflow=0,0,7740,1170 [state=0002000000004621] [content=0x115ca2c50] [sc=0x11687ea40]<
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HTMLScroll(div)(-1)@0x11687f6b0 {180,240,7380,690} [state=0002000000084409] [content=0x11688c0c0] [sc=0x11687eb00]<
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Block(div)(-1)@0x11687fcb8 {0,0,7380,690} [state=0002100000d04601] [content=0x11688c0c0] [sc=0x11687f990:-moz-scrolled-content]<
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line 0x116899130: count=1 state=inline,clean,prevmarginclean,not impacted,not wrapped,before:nobr,after:nobr[0x100] {60,0,0,690} vis-overflow=60,510,0,0 scr-overflow=60,510,0,0 <
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Text(0)""@0x1168990c0 {60,510,0,0} [state=0001000020404000] [content=0x11687ca10] [sc=0x11687fd88:-moz-non-element,parent=0x11687eb00] [run=0x115115e80][0,0,T]
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...
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* js
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Dumps the current JS stack.
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(lldb) js
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0 anonymous(aForce = false) ["chrome://browser/content/browser.js":13414]
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this = [object Object]
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1 updateAppearance() ["chrome://browser/content/browser.js":13326]
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this = [object Object]
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2 handleEvent(aEvent = [object Event]) ["chrome://browser/content/tabbrowser.xml":3811]
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this = [object XULElement]
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* prefcnt EXPR
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Shows the refcount of a given object. EXPR is an expression that is
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evaluated, and can be either a pointer to or an actual refcounted
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object. The object can be a standard nsISupports-like refcounted
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object, a cycle-collected object or a mozilla::RefCounted<T> object.
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(lldb) p this
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(nsHTMLDocument *) $1 = 0x0000000116e9d800
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(lldb) prefcnt this
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20
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(lldb) p mDocumentURI
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(nsCOMPtr<nsIURI>) $3 = {
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mRawPtr = 0x0000000117163e50
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}
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(lldb) prefcnt mDocumentURI
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11
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* pstate EXPR
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Shows the frame state bits (using their symbolic names) of a given frame.
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EXPR is an expression that is evaluated, and must be an nsIFrame*.
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(lldb) p this
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(nsTextFrame *) $1 = 0x000000011f470b10
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(lldb) p/x mState
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(nsFrameState) $2 = 0x0000004080604000
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(lldb) pstate this
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TEXT_HAS_NONCOLLAPSED_CHARACTERS | TEXT_END_OF_LINE | TEXT_START_OF_LINE | NS_FRAME_PAINTED_THEBES | NS_FRAME_INDEPENDENT_SELECTION
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* ptag EXPR
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Shows the DOM tag name of a node. EXPR is an expression that is
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evaluated, and can be either an nsINode pointer or a concrete DOM
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object.
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(lldb) p this
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(nsHTMLDocument *) $0 = 0x0000000116e9d800
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(lldb) ptag this
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(PermanentAtomImpl *) $1 = 0x0000000110133ac0 u"#document"
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(lldb) p this->GetRootElement()
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(mozilla::dom::HTMLSharedElement *) $2 = 0x0000000118429780
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(lldb) ptag $2
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(PermanentAtomImpl *) $3 = 0x0000000110123b80 u"html"
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Supported type summaries and synthetic children
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-----------------------------------------------
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In lldb terminology, type summaries are rules for how to display a value
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when using the "expression" command (or its familiar-to-gdb-users "p" alias),
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and synthetic children are fake member variables or array elements also
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added by custom rules.
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For objects that do have synthetic children defined for them, like nsTArray,
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the "expr -R -- EXPR" command can be used to show its actual member variables.
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* nsAString, nsACString,
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nsFixedString, nsFixedCString,
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nsAutoString, nsAutoCString
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Strings have a type summary that shows the actual string.
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(lldb) frame info
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frame #0: 0x000000010400cfea XUL`nsCSSParser::ParseProperty(this=0x00007fff5fbf5248, aPropID=eCSSProperty_margin_top, aPropValue=0x00007fff5fbf53f8, aSheetURI=0x0000000115ae8c00, aBaseURI=0x0000000115ae8c00, aSheetPrincipal=0x000000010ff9e040, aDeclaration=0x00000001826fd580, aChanged=0x00007fff5fbf5247, aIsImportant=false, aIsSVGMode=false) + 74 at nsCSSParser.cpp:12851
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(lldb) p aPropValue
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(const nsAString_internal) $16 = u"-25px"
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(lldb) p this
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(nsHTMLDocument *) $18 = 0x0000000115b56000
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(lldb) p mContentType
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(nsCString) $19 = {
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nsACString_internal = "text/html"
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}
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* nscolor
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nscolors (32-bit RGBA colors) have a type summary that shows the color as
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one of the CSS 2.1 color keywords, a six digit hex color, an rgba() color,
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or the "transparent" keyword.
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(lldb) p this
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(nsTextFrame *) $0 = 0x00000001168245e0
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(lldb) p *this->StyleColor()
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(const nsStyleColor) $1 = {
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mColor = lime
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}
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(lldb) expr -R -- *this->StyleColor()
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(const nsStyleColor) $2 = {
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mColor = 4278255360
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}
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* nsIAtom
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Atoms have a type summary that shows the string value inside the atom.
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(lldb) frame info
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frame #0: 0x00000001028b8c49 XUL`mozilla::dom::Element::GetBoolAttr(this=0x0000000115ca1c50, aAttr=0x000000011012a640) const + 25 at Element.h:907
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(lldb) p aAttr
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(PermanentAtomImpl *) $1 = 0x000000011012a640 u"readonly"
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* nsTArray and friends
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nsTArrays and their auto and fallible varieties have synthetic children
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for their elements. This means when displaying them with "expr" (or "p"),
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they will be shown like regular arrays, rather than showing the mHdr and
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other fields.
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(lldb) frame info
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frame #0: 0x00000001043eb8a8 XUL`SVGTextFrame::DoGlyphPositioning(this=0x000000012f3f8778) + 248 at SVGTextFrame.cpp:4940
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(lldb) p charPositions
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(nsTArray<nsPoint>) $5 = {
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[0] = {
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mozilla::gfx::BasePoint<int, nsPoint> = {
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x = 0
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y = 816
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}
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}
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[1] = {
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mozilla::gfx::BasePoint<int, nsPoint> = {
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x = 426
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y = 816
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}
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}
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[2] = {
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mozilla::gfx::BasePoint<int, nsPoint> = {
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x = 906
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y = 816
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}
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}
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}
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(lldb) expr -R -- charPositions
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(nsTArray<nsPoint>) $4 = {
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nsTArray_Impl<nsPoint, nsTArrayInfallibleAllocator> = {
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nsTArray_base<nsTArrayInfallibleAllocator, nsTArray_CopyWithMemutils> = {
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mHdr = 0x000000012f3f1b80
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}
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}
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}
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* nsTextNode, nsTextFragment
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Text nodes have a type summary that shows the nsTextFragment in the
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nsTextNode, which itself has a type summary that shows the text
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content.
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(lldb) p this
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(nsTextFrame *) $14 = 0x000000011811bb10
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(lldb) p mContent
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(nsTextNode *) $15 = 0x0000000118130110 "Search or enter address"
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