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%!PS-Adobe-3.0
%%Title: NOTES
%%For: Feng QIAN
%%Creator: a2ps version 4.13
%%CreationDate: Thu Mar  7 09:58:51 2002
%%BoundingBox: 24 24 588 768
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%Pages: 2
%%PageOrder: Ascend
%%DocumentMedia: Letter 612 792 0 () ()
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%%+ font Courier-Bold
%%+ font Courier-BoldOblique
%%+ font Courier-Oblique
%%+ font Helvetica
%%+ font Helvetica-Bold
%%+ font Symbol
%%+ font Times-Bold
%%+ font Times-Roman
%%DocumentProcessColors: Black 
%%DocumentSuppliedResources: procset a2ps-a2ps-hdr
%%+ procset a2ps-black+white-Prolog
%%+ encoding ISO-8859-1Encoding
%%EndComments
/a2psdict 200 dict def
a2psdict begin
%%BeginProlog
%%Copyright: (c) 1988, 89, 90, 91, 92, 93 Miguel Santana
%%Copyright: (c) 1995, 96, 97, 98 Akim Demaille, Miguel Santana
% Check PostScript language level.
/languagelevel where {
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} {
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} ifelse

% EPSF import as in the Red Book
/BeginInclude {
  /b4_Inc_state save def    		% Save state for cleanup
  /dict_count countdictstack def	% Count objects on dict stack
  /op_count count 1 sub def		% Count objects on operand stack 
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    1 setlinewidth 0 setlinejoin
    10 setmiterlimit [ ] 0 setdash newpath
    gs_languagelevel 1 ne {
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/EndInclude {
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% Page prefeed
/page_prefeed {         % bool -> -
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  } ifelse
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/deffont {
  findfont exch scalefont def
} bind def

/reencode_font {
  findfont reencode 2 copy definefont pop def
} bind def

% Function c-show (str => -)
% centers text only according to x axis.
/c-show { 
  dup stringwidth pop
  2 div neg 0 rmoveto
  show
} bind def

% Function l-show (str => -)
% prints texts so that it ends at currentpoint
/l-show {
  dup stringwidth pop neg 
  0 
  rmoveto show
} bind def

% center-fit show (str w => -)
% show centered, and scale currentfont so that the width is less than w
/cfshow {
  exch dup stringwidth pop
  % If the title is too big, try to make it smaller
  3 2 roll 2 copy
  gt
  { % if, i.e. too big
    exch div
    currentfont exch scalefont setfont
  } { % ifelse
    pop pop 
  }
  ifelse
  c-show			% center title
} bind def

% Return the y size of the current font
% - => fontsize
/currentfontsize {
  currentfont /FontMatrix get 3 get 1000 mul
} bind def

% reencode the font
%   -> 
/reencode { %def
  dup length 5 add dict begin
    { %forall
      1 index /FID ne 
      { def }{ pop pop } ifelse
    } forall
    /Encoding exch def

    % Use the font's bounding box to determine the ascent, descent,
    % and overall height; don't forget that these values have to be
    % transformed using the font's matrix.
    % We use `load' because sometimes BBox is executable, sometimes not.
    % Since we need 4 numbers an not an array avoid BBox from being executed
    /FontBBox load aload pop
    FontMatrix transform /Ascent exch def pop
    FontMatrix transform /Descent exch def pop
    /FontHeight Ascent Descent sub def

    % Define these in case they're not in the FontInfo (also, here
    % they're easier to get to.
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    /UnderlineThickness 1 def
    
    % Get the underline position and thickness if they're defined.
    currentdict /FontInfo known {
      FontInfo
      
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	/UnderlinePosition exch def
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	/UnderlineThickness get
	0 exch FontMatrix transform exch pop
	/UnderlineThickness exch def
      } if
      
    } if
    currentdict 
  end 
} bind def

% Function print line number ( # -)
/# {
  gsave
    sx cw mul neg 2 div 0 rmoveto
    f# setfont
    c-show
  grestore
} bind def

% -------- Some routines to enlight plain b/w printings ---------

% Underline
% width --
/dounderline {
  currentpoint
  gsave
    moveto
    0 currentfont /Descent get currentfontsize mul rmoveto
    0 rlineto
    stroke
  grestore
} bind def

% Underline a string
% string --
/dounderlinestring {
  stringwidth pop
  dounderline
} bind def

/UL {
  /ul exch store
} bind def

% Draw a box of WIDTH wrt current font
% width --
/dobox {
  currentpoint
  gsave
    newpath
    moveto
    0 currentfont /Descent get currentfontsize mul rmoveto
    dup 0 rlineto
    0 currentfont /FontHeight get currentfontsize mul rlineto
    neg 0 rlineto
    closepath
    stroke
  grestore
} bind def

/BX {
  /bx exch store
} bind def

% Box a string
% string --
/doboxstring {
  stringwidth pop
  dobox
} bind def

%
% ------------- Color routines ---------------
%
/FG /setrgbcolor load def

% Draw the background
% width --
/dobackground {
  currentpoint
  gsave
    newpath
    moveto
    0 currentfont /Descent get currentfontsize mul rmoveto
    dup 0 rlineto
    0 currentfont /FontHeight get currentfontsize mul rlineto
    neg 0 rlineto
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    bgcolor aload pop setrgbcolor
    fill
  grestore
} bind def

% Draw bg for a string
% string --
/dobackgroundstring {
  stringwidth pop
  dobackground
} bind def


/BG {
  dup /bg exch store
  { mark 4 1 roll ] /bgcolor exch store } if
} bind def


/Show {
  bg { dup dobackgroundstring } if
  ul { dup dounderlinestring } if
  bx { dup doboxstring } if
  show
} bind def

% Function T(ab), jumps to the n-th tabulation in the current line
/T {
  cw mul x0 add
  bg { dup currentpoint pop sub dobackground } if
  ul { dup currentpoint pop sub dounderline } if
  bx { dup currentpoint pop sub dobox } if
  y0 moveto
} bind def

% Function n: move to the next line
/n {
  /y0 y0 bfs sub store
  x0 y0 moveto
} bind def

% Function N: show and move to the next line
/N {
  Show
  /y0 y0 bfs sub store
  x0 y0 moveto
} bind def

/S {
  Show
} bind def

%%BeginResource: procset a2ps-a2ps-hdr 2.0 2
%%Copyright: (c) 1988, 89, 90, 91, 92, 93 Miguel Santana
%%Copyright: (c) 1995, 96, 97, 98 Akim Demaille, Miguel Santana
% Function title: prints page header.
%    are passed as argument
/title { 
  % 1. Draw the background
  x v get y v get moveto
  gsave
    0 th 2 div neg rmoveto 
    th setlinewidth
    0.95 setgray
    pw 0 rlineto stroke
  grestore
  % 2. Border it
  gsave
    0.7 setlinewidth
    pw 0 rlineto
    0 th neg rlineto
    pw neg 0 rlineto
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  grestore
  % stk: ct rt lt
  x v get y v get th sub 1 add moveto
%%IncludeResource: font Helvetica
  fHelvetica fnfs 0.8 mul scalefont setfont
  % 3. The left title
  gsave
    dup stringwidth pop fnfs 0.8 mul add exch % leave space took on stack
    fnfs 0.8 mul hm rmoveto
    show			% left title
  grestore
  exch
  % stk: ct ltw rt
  % 4. the right title
  gsave
    dup stringwidth pop fnfs 0.8 mul add exch % leave space took on stack
    dup
    pw exch stringwidth pop fnfs 0.8 mul add sub
    hm
    rmoveto
    show			% right title
  grestore
  % stk: ct ltw rtw
  % 5. the center title
  gsave
    pw 3 1 roll
    % stk: ct pw ltw rtw
    3 copy 
    % Move to the center of the left room
    sub add 2 div hm rmoveto
    % What is the available space in here?
    add sub fnfs 0.8 mul sub fnfs 0.8 mul sub
    % stk: ct space_left
%%IncludeResource: font Helvetica-Bold
  fHelvetica-Bold fnfs scalefont setfont
    cfshow
  grestore
} bind def

% Function border: prints virtual page border
/border { %def
  gsave				% print four sides
    0 setgray
    x v get y v get moveto
    0.7 setlinewidth		% of the square
    pw 0 rlineto
    0 ph neg rlineto
    pw neg 0 rlineto
    closepath stroke
  grestore
} bind def

% Function water: prints a water mark in background
/water { %def
  gsave
    scx scy moveto rotate
%%IncludeResource: font Times-Bold
  fTimes-Bold 100 scalefont setfont
    .97 setgray
    dup stringwidth pop 2 div neg -50 rmoveto
    show
  grestore
} bind def

% Function rhead: prints the right header
/rhead {  %def
  lx ly moveto
  fHelvetica fnfs 0.8 mul scalefont setfont
  l-show
} bind def

% Function footer (cf rf lf -> -)
/footer {
  fHelvetica fnfs 0.8 mul scalefont setfont
  dx dy moveto
  show

  snx sny moveto
  l-show
  
  fnx fny moveto
  c-show
} bind def
%%EndResource
%%BeginResource: procset a2ps-black+white-Prolog 2.0 1

% Function T(ab), jumps to the n-th tabulation in the current line
/T { 
  cw mul x0 add y0 moveto
} bind def

% Function n: move to the next line
/n { %def
  /y0 y0 bfs sub store
  x0 y0 moveto
} bind def

% Function N: show and move to the next line
/N {
  Show
  /y0 y0 bfs sub store
  x0 y0 moveto
}  bind def

/S {
  Show
} bind def

/p {
  false UL
  false BX
  fCourier bfs scalefont setfont
  Show
} bind def

/sy {
  false UL
  false BX
  fSymbol bfs scalefont setfont
  Show
} bind def

/k {
  false UL
  false BX
  fCourier-Oblique bfs scalefont setfont
  Show
} bind def

/K {
  false UL
  false BX
  fCourier-Bold bfs scalefont setfont
  Show
} bind def

/c {
  false UL
  false BX
  fCourier-Oblique bfs scalefont setfont
  Show
} bind def

/C {
  false UL
  false BX
  fCourier-BoldOblique bfs scalefont setfont
  Show 
} bind def

/l {
  false UL
  false BX
  fHelvetica bfs scalefont setfont
  Show
} bind def

/L {
  false UL
  false BX
  fHelvetica-Bold bfs scalefont setfont
  Show 
} bind def

/str{
  false UL
  false BX
  fTimes-Roman bfs scalefont setfont
  Show
} bind def

/e{
  false UL
  true BX
  fHelvetica-Bold bfs scalefont setfont
  Show
} bind def

%%EndResource
%%EndProlog
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% Dictionary for ISO-8859-1 support
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  /fHelvetica-Bold ISO-8859-1Encoding /Helvetica-Bold reencode_font
  /fTimes-Bold ISO-8859-1Encoding /Times-Bold reencode_font
  /fTimes-Roman ISO-8859-1Encoding /Times-Roman reencode_font
currentdict end def
/bgcolor [ 0 0 0 ] def
/bg false def
/ul false def
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% The font for line numbering
/f# /Helvetica findfont bfs .6 mul scalefont def
/fSymbol /Symbol findfont def
/hm fnfs 0.25 mul def
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/fnx scx def
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/sx 0 def
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/x0 0 def
/y0 0 def
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gsave
llx lly 0 add translate
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/x0 x v get 5.040000 add sx cw mul add store
/y0 y v get bfs  sub store
x0 y0 moveto
(NOTES on native methods side-effect simulation:) p n
() N
(1. Environment:) N
() N
(   Since JVM allows multi class loaders and dynamic class loading, ) N
(   a static analysis may not be about to figure out exact classes ) N
(   get loaded. This should be rear cases in our analyzed benchmarks.) N
() N
(   Our analysis assumes a closed world environment which means all) N
(   classes will be loaded are presented in our environment when) N
(   being analyzed. ) N
() N
(   We list known environmental constants assumed by native methods.) N
(   This is not a complete list. Each of following classes has one ) N
(   abstract object existing:) N
(   ) N
(    java.lang.ClassLoader ) S 32 T (Environment.getClassLoaderObject\(\);) N
(    java.lang.Process) S 24 T () S 32 T (Environment.getProcessObject\(\);) N
(    java.lang.Thread) S 24 T () S 32 T (Environment.getThreadObject\(\);) N
(    java.io.FileSystem) S 24 T () S 32 T (Environment.getFileSystemObject\(\);) N
(    java.lang.Class             Environment.getClassObject\(\);) N
(    java.lang.reflect.Field     Environment.getFieldObject\(\);) N
(    java.lang.reflect.Method    Environment.getMethodObject\(\);) N
(    java.lang.reflect.Constructor) N
() S 8 T () S 16 T () S 24 T () S 32 T (Environment.getConstructorObject\(\);) N
(    ) N
(   Allowing only one abstract object exist means any 'new xxx\(\)' expression) N
(   should return the only object of the class 'xxx'.) N
(        ) N
(   The field of above constant object should have one object also. \(TODO!\)) N
() N
(   There are some other constants need to be considered separately.) N
() N
(2. Strings:) N
() N
(   Many native methods return strings. Since java.lang.String is final,) N
(   we can use a single 'String' object for any string from unknown sources.) N
(  ) N
(   Environment.getStringObject\(\); ) N
(   ) N
(3. Reflections:) N
() N
(   Reflections make static analyses almost unrealistic because each field) N
(   can be accessed without unveiling static information, and each ) N
(   method may be invoked without knowing receiver and targets statically.) N
() N
(   Current, the simulator warns the user by throwing a runtime exception) N
(   that the analysis is not able to handle these features.) N
() N
(4. Serializations:) N
() N
(   The ObjectInputStream/ObjectOutputStream read/write fields of objects ) N
(   by field IDs through native calls.) N
(   ) N
(   The caller is warned by throwing an exception.) N
() N
(   java.io.ObjectInputStream) N
(   java.io.ObjectOutputStream) N
() N
(5. Exceptions:) N
() N
grestore
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(   Some native methods may throw exceptions. It is not considered right now.) p n
() N
(6. Objects created with unknown types:) N
() N
(   There are a few native methods which may create objects for statically ) N
(   unknown classes. In this situation, we suggest the class hierarchy add) N
(   a least class type \(which can be understood as NULL type\). The least type) N
(   won't affect the type information and virtual call resolution. But it) N
(   does not block the flow information.) N
() N
(7. Other methods called by JVM directly:) N
(   ) N
(   Non-trivial finilizer should be passed in all possible instantiations.) N
(   There may be other methods called by VM directly, but which change ) N
(   points information.) N
grestore
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pagesave restore
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%%Trailer
end
%%EOF




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