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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2003-2008 - INRIA - Serge STEER <serge.steer@inria.fr>
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
function c1=bytecodewalk(code,query,job)
//walk along bytecode looking for a particular opcode (query) and
//applying a function (job) at this point
c1=[];
lc0=1;
lc=lc0;
long_walk=size(code,'*')
while lc<=long_walk
//mprintf("lc=%d,op=%d\n",lc,code(lc))
if code(lc)==query then
c1=[c1 code(lc0:lc-1)]
[ctemp,lc]=job(lc)
c1=[c1 ctemp]
lc0=lc
else
select code(lc)
case 0 then //deleted ops
lc=lc+double(code(lc+1))
case 1 then //stackp (obsolete)
lc=lc+1+nsiz
case 2 then //stackg
lc=lc+nsiz+3
case 3 then //string
ni=double(code(lc+1))
lc=lc+2+ni
case 4 then//[]
lc=lc+1
case 5 then //allops
lc=lc+4
case 6 then //num
lc=lc+3
case 7 then//for
c1=[c1 code(lc0:lc-1)]
ll=lc
lc=lc+1
long=double(code(lc))
lc=lc+1
cv=bytecodewalk(code(lc:lc+long-1))
lc=lc+long
long=double(code(lc))
lc=lc+1
id=code(lc:lc-1+nsiz)
lc=lc+nsiz
cc=bytecodewalk(code(lc:lc+long-1))
c1=[c1 int32(7) int32(size(cv,'*')) cv int32(size(cc,'*')) id cc]
lc=lc+long
lc0=lc
case 8 then //if
if code(lc+1)==0 then //very old code
error(msprintf(gettext("%s: obsolete op-code %d.\n"),"bytecodewalk",8))
end
c1=[c1 code(lc0:lc-1)]
ll=lc
long_tot=abs(double(code(lc+1)))
nif=double(code(lc+2))
ctemp=code(lc:lc+3)
lc=lc+4
for k=1:nif
long_if_expr=double(code(lc))
lc=lc+1
c_if_expr=bytecodewalk(code(lc:lc+long_if_expr-1))
lc=lc+long_if_expr
long_if_expr=size(c_if_expr,'*')
long_if_then=double(code(lc))
lc=lc+1
c_if_then=bytecodewalk(code(lc:lc+long_if_then-1))
lc=lc+long_if_then
long_if_then=size(c_if_then,'*')
ctemp=[ctemp int32(long_if_expr) c_if_expr int32(long_if_then) ...
c_if_then]
end
long_else=double(code(lc))
lc=lc+1
c_else=bytecodewalk(code(lc:lc+long_else-1))
lc=lc+long_else
long_else=size(c_else,'*')
ctemp =[ctemp int32(long_else) c_else]
//padding ???
if lc-ll<long_tot then ctemp=[ctemp code(lc:ll+long_tot-1)];lc=ll+long_tot;end
lc0=lc
// if size(ctemp,'*')<>long_tot then pause,end
long_tot=size(ctemp,'*')
ctemp(2)=-int32(long_tot)
c1=[c1 ctemp]
case 9 then //while
if code(lc+1)==0 then //very old code
error(msprintf(gettext("%s: obsolete op-code %d.\n"),"bytecodewalk",9))
end
c1=[c1 code(lc0:lc-1)]
ll=lc
long_tot=abs(double(code(lc+1)))
lc=lc+4
ctemp=int32([9 0 1 0])
long_while_expr=double(code(lc))
lc=lc+1
c_while_expr=bytecodewalk(code(lc:lc+long_while_expr-1))
lc=lc+long_while_expr
long_while_expr=size(c_while_expr,'*')
long_while_then=double(code(lc));llthen=lc
lc=lc+1
c_while_then=bytecodewalk(code(lc:lc+long_while_then-1));
lc=lc+long_while_then;
long_while_then=size(c_while_then,'*');
ctemp=[ctemp int32(long_while_expr) c_while_expr int32(long_while_then) c_while_then];
long_else=double(code(lc))
lc=lc+1
c_else=bytecodewalk(code(lc:lc+long_else-1))
lc=lc+long_else
long_else=size(c_else,'*')
ctemp =[ctemp int32(long_else) c_else]
if lc-ll<long_tot then ctemp=[ctemp code(lc:ll+long_tot-1)];lc=ll+long_tot;end
lc0=lc
long_tot=size(ctemp,'*')
ctemp(2)=-int32(long_tot)
c1=[c1 ctemp]
case 10 then//select case
c1=[c1 code(lc0:lc-1)]
ll=lc
long_tot=abs(double(code(lc+1)))
ncase=double(code(lc+2))
ctemp=code(lc:lc+2)
lc=lc+3
long_case_expr=double(code(lc))
lc=lc+1
c_case_expr=bytecodewalk(code(lc:lc+long_case_expr-1))
lc=lc+long_case_expr
long_case_expr=size(c_case_expr,'*')
ctemp=[ctemp int32(long_case_expr) c_case_expr]
for k=1:ncase
long_case_expr=double(code(lc));
lc=lc+1;
c_case_expr=bytecodewalk(code(lc:lc+long_case_expr-1))
lc=lc+long_case_expr;
long_case_expr=size(c_case_expr,'*');
long_case_then=double(code(lc))
lc=lc+1
c_case_then=bytecodewalk(code(lc:lc+long_case_then-1))
lc=lc+long_case_then
long_case_then=size(c_case_then,'*')
ctemp=[ctemp int32(long_case_expr) c_case_expr int32(long_case_then) ...
c_case_then]
end
long_else=double(code(lc))
lc=lc+1
c_else=bytecodewalk(code(lc:lc+long_else-1))
lc=lc+long_else
long_else=size(c_else,'*')
ctemp =[ctemp int32(long_else) c_else]
//padding ???
if lc-ll<long_tot then ctemp=[ctemp code(lc:ll+long_tot-1)];lc=ll+long_tot;end
lc0=lc
//if size(ctemp,'*')<>long_tot then pause,end
long_tot=size(ctemp,'*')
ctemp(2)=int32(long_tot)
c1=[c1 ctemp]
case 11 then //try catch
long_try=double(code(lc+1))
long_catch=double(code(lc+2))
lc=lc+3
c_try=bytecodewalk(code(lc:lc+long_try-1))
lc=lc+long_try
long_try=size(c_try,'*')
c_catch=bytecodewalk(code(lc:lc+long_catch-1))
lc=lc+long_catch
long_catch=size(c_catch,'*')
c1=[c1 int32([11 long_try long_catch]) c_try c_catch]
lc0=lc
case 12 then //pause
lc=lc+1
case 13 then //break
lc=lc+1
case 14 then //abort
lc=lc+1
case 15 then //eol
lc=lc+1
case 16 then //line num
lc=lc+2
case 17 then //return
lc=lc+1
case 18 then //nmark named variable
lc=lc+1+nsiz
case 19 then //Mkindx
lc=lc+3
case 20 then
lc=lc+1
case 21 then //begrhs
lc=lc+1
case 22 then //printmode
lc=lc+2
case 23 then //name2var
lc=lc+1+nsiz
case 24 then //
lc=lc+1
case 25 then //profile
lc=lc+3
case 26 then //vector of string
n=double(code(lc+1)*code(lc+2))
nc=double(code(lc+4+n))-1
lc=lc+5+n+nc
case 27 then //varfunptr
lc=lc+3+nsiz
case 28 then //
lc=lc+1
case 29 then //assignment
nlhs=double(code(lc+1))
lc=lc+3+nlhs*(nsiz+1)
case 30 then // skip logical evaluation
lc=lc+3
case 31 then //comment
lc=lc+2+double(code(lc+1))
case 99 then
lc=lc+1
else//Matfns
lc=lc+4
end
end
end
c1=[c1 code(lc0:$)]
endfunction
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