Gecko

XPCOM

• Cross Platform Component Object Model; A framework which allows developers to break up monolithic software projects into smaller modularized pieces
• Provide:
  1. component management
  2. object message passing
  3. memory management
• nsISupports(?)
• CID: 128-bit number that uniquely identifies a class or component.{ 0x777f7150, 0x4a2b, 0x4301, 0xad, 0x10, 0x5e, 0xab, 0x25, 0xb3, 0x22, 0xaa}
• IID: 128-bit number that uniquely identifies an interface
• Contract ID: human readable string used to access a component."@mozilla.org/network/ldap-operation;1"
• Expections(?): All interface methods should return an nsresult error value

Create XPCOM Component

• https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Guide/Creating_components

XPConnect

• The bridge between XPCOM and JS(?)

XPIDL

• An Interface Description Language used to specify XPCOM interface classes
• Some examples are in the gecko/xpcom/base and geckoxpcom/ds directories

xpidl

• A tool
• For generating XPCOM interface information
  1. c++ headers
  2. type library files(.xpt): type library is the binary representation of interfaces.类型lib库(.xpt文件)，是用接口类文件生成的二进制的文件。

xptcall

• A small low level XPCOM method call library.
• The code is at: gecko/xpcom/reflect/xptcall
• xptcall exists for two reasons:
  1. To support invoking arbitrary methods on XPCOM interfaces.
  2. To support dynamically impersonating any XPCOM interface.

Non-blocking IO(?)

There is an IO thread in gecko. You can check RilClient in gecko/ipc/ril/Ril.cpp

Code Directory Structure

• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code/Directory_structure

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