1. “Whidbey” CLR Internals
11/12/ :39 PM
Session Code: ARC413
“Whidbey” CLR Internals
Jonathan Keljo
Program Manager
Microsoft Corporation
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

2. 11/12/ :39 PM
Tools
Client Application Model
Web & Service Application Model
Data Systems Application Model
Mobile PC & Devices Application Model
Command Line
Compact Framework
Avalon
Windows Forms
ASP.NET / Indigo
Win FS
Yukon
System.Console
Mobile PC Optimized
System.Web
System.Storage
System.Data.SqlServer
System.Windows.Forms
System.Windows
NT Service
System.Windows
System.Windows.Forms
System.ServiceProcess
Presentation
Data
Communication
System.Windows
System.Search
System.Data
System.Messaging
System. Discovery
System.Collaboration
UI Element
Explorer
Media
Annotations
SqlClient
DataSet
System.DirectoryServices
RealTimeEndpoint
Documents
Controls
Animation
SqlTypes
Mapping
Active Directory
TransientDataSession
Monitoring
System.Remoting
Text Element
Dialogs
Controls
SqlXML
ObjectSpaces
SignalingSession
Logging
System.Runtime.Remoting
Uddi
Shapes
SideBar
Control
OdbcClient
ObjectSpace
Media
Shape
Notification
Panel
Relevance
OleDbClient
Query
Activities
Ink
Navigation
Design
OracleClient
Schema
System.Web.Services
System.MessageBus
Web.Service
Transport
Queue
System.Storage
System.Windows.Forms
System.Web.UI
Port
PubSub
Item
Core
Description
Forms
Page
WebControls
Discovery
Channel
Router
Relationship
Contact
Control
Control
Adaptors
Service
Policy
Media
Location
Protocols
Print Dialog
HtmlControls
Design
Peer Group
Audio
Message
Design
MobileControls
Video
Document
System.Net
Images
Event
System.Web
System.Help
System.Speech
HttpWebRequest
NetworkInformation
System.Xml
Personalization
FtpWebListener
Sockets
System.Drawing
Recognition
Synthesis
Caching
Schema
Xpath
SslClientStream
Cache
System.NaturalLanguageServices
Serialization
Query
SessionState
WebClient
Fundamentals
Base & Application Services
Security
Configuration
Deployment/Management
System.Timers
System.Text
System.Collections
System.Windows. TrustManagement
System.Web.Configuration
System.Globalization
System.Design
System.Security
System.Web
Generic
System.MessageBus.Configuration
Administration
System.Serialization
System.IO
System.Web. Security
Authorization
Permissions
System.ComponentModel
System.Configuration
Management
System.Threading
Ports
AccessControl
Policy
System.CodeDom
System.Resources
System.Message Bus.Security
Credentials
Principal
System.Management
System.Runtime
System.Reflection
Cryptography
Token
System.Deployment
Serialization
InteropServices
System.EnterpriseServices
System.Diagnostics
CompilerServices
System.Transactions
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

3. Frameworks (BCL, WinFX, etc.)
11/12/ :39 PM
The Big Picture
IDE
Debugger
Editor
Compiler
Source Files
Frameworks (BCL, WinFX, etc.)
EXE (IL)
CLR
JIT
Loader GC
Metadata
Exceptions
Interop
Threading
Remoting
Security
Debugging
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

4. C++ Templates … Stack <int> <double> <point> Main
11/12/ :39 PM
C++ Templates
template <class T> class Stack { …
T Pop() … }
Template stack class
Stack
<int>
<double>
<point> …
Main
program
Executable (x86)
C++
Compiler
Stack<int> … …
Stack <double> …
Stack <point> …
Main program source
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

5. CLR Generics Stack <T> Main program class Stack<T> { …
11/12/ :39 PM
CLR Generics
class Stack<T> { …
T Pop() … }
Template stack class
.NET
Compiler
Stack
<T>
Main
program
Executable (IL)
Stack<int> … …
Stack <double> …
Stack <point> …
Main program source
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

6. Generics in IL & Metadata
11/12/ :39 PM
Generics in IL & Metadata
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

7. IL Execution IL (Source line “T retval = _array[topOfStack]”) ldarg.0
11/12/ :39 PM
IL Execution
IL (Source line “T retval = _array[topOfStack]”)
ldarg.0
ldfld !0[] class GenericsDemo.GenericStack<!0>::_array
ldloc.0
ldelem !0
stloc.1
Arguments
[0]
this
Locals
[0]
topOfStack
[1]
null
topOfStack
topOfStack
this._array[topOfStack]
this._array[topOfStack]
this._array[topOfStack]
this._array
this._array
this
this
Evaluation Stack
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

8. GenericParamConstraint (0x2c)
11/12/ :39 PM
Generics in Metadata
TypeDef (0x2) …
Name
Field
List
Method
GenericStack
Method (0x6) …
Name
Signature
Param
List
.ctor
Pop
Push
Param (0x8) …
Name
initialSize
toPush
GenericParam (0x2a)
Number …
Owner
Name T
Field (0x4) …
Name
Signature
_array
06 1d 13 00
_depth
06 08
GenericParamConstraint (0x2c)
Owner
Constraint
System.Object …
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

9. Param 1 Type is Generic Type Parameter
11/12/ :39 PM
Generic Signatures …
Push
Pop
.ctor
Signature
Name
Method (0x6)
Param (0x8) …
Name
initialSize
toPush
Push
Param 1 Type is Generic Type Parameter
Instance Method
(has “this”/”Me”)
With 1
Parameter
Void
Return
void Push(T toPush); 20 01 01 13
Param 1 is of type T 00
“Calling Convention”
# Parameters
Return Type
Element Type
Parameter Types
Type Param Index
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

10. Generics: Code Generation
11/12/ :39 PM
Generics: Code Generation
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

11. Generics – Code Generation
11/12/ :39 PM
Generics – Code Generation
MethodTable
_array
_depth 2 …
Stack <int> MethodTable
x86
.ctor <int> 4 2 …
x86
Pop <int> …
Stack<object> MethodTable
x86
Push <int>
MethodTable
_array
_depth 5 …
x86
.ctor <object>
MethodTable
_array
_depth 7
x86
Pop <object> …
Stack<Form> MethodTable …
x86
Push <object>
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

12. Frameworks (BCL, WinFX, etc.)
11/12/ :39 PM
The Big Picture
IDE
Debugger
Editor
Compiler
Source Files
Frameworks (BCL, WinFX, etc.)
EXE (IL)
CLR
JIT
Loader GC
Metadata
Exceptions
Interop
Threading
Remoting
Security
Debugging
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

13. EnC: Editing a Method 11/12/2018 12:39 PM
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

14. EnC – Editing a Method (1) Delta IL & Delta Metadata
11/12/ :39 PM
EnC – Editing a Method (1) Delta IL & Delta Metadata
Delta Metadata (Provided by debugger)
Full Metadata (In Running Process)
Method (0x6)
RVA …
Name 4
PrintStatistics
Method (0x6)
RVA …
Name
2050
Main
20a8
PrintStatistics
INV
EnCLog (0x1e)
Token
FuncCode …
EnCMap (0x1f)
Token …
2050
Complete Original IL .
Other Data
20a8
Delta Header
IL Header for PrintStatistics
nop
ldc.i4.0
stloc.1 . 4
Delta IL
8940
8944
Delta IL
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

15. EnC – Editing a Method (2) Remap
11/12/ :39 PM
EnC – Editing a Method (2) Remap
IL Virtual Execution System
x86 Processor
Original IL
Variables
Original x86
Stack … i
sum
Registers …
numbers
.locals init
(int32, int32) .
call Console.ReadLine
pop
nop
ret
numbers i
sum .
call FFFFD630
pop ebx
pop esi
pop edi
avg
avg
New IL
New x86
.locals init
(int32, int32, double) .
call Console.ReadLine
pop
nop
ret .
call FFFFD630
fild dword …
fstp dword …
mov ecx, edi
pop ebx
pop esi
pop edi
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

16. EnC – Editing Within a Call
11/12/ :39 PM
EnC – Editing Within a Call
IL Virtual Execution System
x86 Processor
Original IL
Variables
Original x86
Stack … i
sum
Registers …
numbers
.locals init
(int32, int32) .
call Console.ReadLine
pop
nop
ret
numbers i
sum .
call FFFFD630
pop ebx
pop esi
pop edi
vars for
ReadLine .
avg
avg
New IL
New x86
.locals init
(int32, int32, double) .
call Console.ReadLine
pop
nop
ret .
call FFFFD630
fild dword …
fstp dword …
mov ecx, edi
pop ebx
pop esi
pop edi
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

17. EnC: Editing a Class 11/12/2018 12:39 PM
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

18. EnC – Editing a Class (1) Delta Metadata
11/12/ :39 PM
EnC – Editing a Class (1) Delta Metadata
Delta Metadata (Provided by debugger)
Full Metadata (In Running Process)
Field (0x4) …
Name
Signature
_avg
06 0d
_max
06 08
TypeDef (0x2) …
Name
Field
List
StatBuilder
EnCLog (0x1e)
Token
Func
Code 2 …
EnCMap (0x1f)
Token …
FieldPtr (0X3)
Token …
Field (0x4) …
Name
Signature
_numbers
_sum
06 08
_avg
06 0d
_max
06 08
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

19. EnC – Editing a Class (2) Extending Existing Instances
11/12/ :39 PM
EnC – Editing a Class (2) Extending Existing Instances
SyncBlock
MethodTable
_numbers
_sum
500
SyncBlock
MethodTable
_numbers
_sum 33 …
SyncBlock
MethodTable
_numbers
_sum
101
_max 8
_avg
5.5
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

20. Keeping Things Sane Runtime Power vs. Language Legality
11/12/ :39 PM
Keeping Things Sane Runtime Power vs. Language Legality
Can do all kinds of crazy things with CLR’s support
Left to the languages to decide what edits make sense
Lots of potential work here
EnC-friendly codegen
Exception handling
Managing cascading effects of edits
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

21. Shameless Plug Language Implementers’ Lunch Thursday 11:30-1:30
11/12/ :39 PM
Shameless Plug
Language Implementers’ Lunch
Thursday 11:30-1:30
Programming Languages & Tools Track Lounge
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

22. Community Resources Get Your Questions Answered!
11/12/ :39 PM
Community Resources Get Your Questions Answered!
Newsgroups:
microsoft.private.whidbey.clr
Architecture & Infrastructure Lounge: 309 Foyer
connect with Microsoft infrastructure product teams, and PDC 2003 Speakers
PDC Weblogs:
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

23. 11/12/ :39 PM
Resources
Books
The Common Language Infrastructure Annotated Standard. ISBN
Inside Microsoft .NET IL Assembler. ISBN
Essential .NET Volume 1. ISBN
Shared Source CLI Essentials. ISBN X
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

24. 11/12/ :39 PM
Questions?
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

25. © 2003-2004 Microsoft Corporation. All rights reserved.
11/12/ :39 PM
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

26. 11/12/ :39 PM
© Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.