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469 lines
16 KiB
ObjectPascal
469 lines
16 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1996-98 by Florian Klaempfl
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This unit exports some help routines for the code generation
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit hcodegen;
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interface
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uses
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aasm,tree,symtable
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{$ifdef i386}
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,i386
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{$endif}
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{$ifdef m68k}
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,m68k
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{$endif}
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;
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const
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pi_uses_asm = $1; { set, if the procedure uses asm }
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pi_is_global = $2; { set, if the procedure is exported by an unit }
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pi_do_call = $4; { set, if the procedure does a call }
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pi_operator = $8; { set, if the procedure is an operator }
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pi_C_import = $10; { set, if the procedure is an external C function }
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pi_uses_exceptions = $20;{ set, if the procedure has a try statement => }
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{ no register variables }
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type
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pprocinfo = ^tprocinfo;
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tprocinfo = record
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{ pointer to parent in nested procedures }
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parent : pprocinfo;
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{ current class, if we are in a method }
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_class : pobjectdef;
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{ return type }
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retdef : pdef;
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{ return type }
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sym : pprocsym;
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{ the definition of the proc itself }
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{ why was this a pdef only ?? PM }
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def : pprocdef;
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{ frame pointer offset }
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framepointer_offset : longint;
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{ self pointer offset }
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ESI_offset : longint;
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{ result value offset }
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retoffset : longint;
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{ firsttemp position }
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firsttemp : longint;
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funcret_is_valid : boolean;
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{ parameter offset }
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call_offset : longint;
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{ some collected informations about the procedure }
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{ see pi_xxxx above }
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flags : longint;
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{ register used as frame pointer }
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framepointer : tregister;
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{ true, if the procedure is exported by an unit }
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globalsymbol : boolean;
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{ true, if the procedure should be exported (only OS/2) }
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exported : boolean;
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{ code for the current procedure }
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aktproccode,aktentrycode,
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aktexitcode,aktlocaldata : paasmoutput;
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{ local data is used for smartlink }
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end;
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var
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{ info about the current sub routine }
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procinfo : tprocinfo;
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{ labels for BREAK and CONTINUE }
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aktbreaklabel,aktcontinuelabel : plabel;
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{ label when the result is true or false }
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truelabel,falselabel : plabel;
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{ label to leave the sub routine }
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aktexitlabel : plabel;
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{ also an exit label, only used we need to clear only the stack }
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aktexit2label : plabel;
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{ only used in constructor for fail or if getmem fails }
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quickexitlabel : plabel;
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{ Boolean, wenn eine loadn kein Assembler erzeugt hat }
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simple_loadn : boolean;
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{ tries to hold the amount of times which the current tree is processed }
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t_times : longint;
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{ true, if an error while code generation occurs }
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codegenerror : boolean;
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{ initialize respectively terminates the code generator }
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{ for a new module or procedure }
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procedure codegen_doneprocedure;
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procedure codegen_donemodule;
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procedure codegen_newmodule;
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procedure codegen_newprocedure;
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{ counts the labels }
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function case_count_labels(root : pcaserecord) : longint;
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{ searches the highest label }
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function case_get_max(root : pcaserecord) : longint;
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{ searches the lowest label }
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function case_get_min(root : pcaserecord) : longint;
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{ concates/inserts the ASCII string to the data segment }
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procedure generate_ascii(const hs : string);
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procedure generate_ascii_insert(const hs : string);
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{ concates/inserts the ASCII string from pchar to the data segment }
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{ WARNING : if hs has no #0 and strlen(hs)=length }
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{ the terminal zero is not written }
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procedure generate_pascii(a : paasmoutput;hs : pchar;length : longint);
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procedure generate_pascii_insert(hs : pchar;length : longint);
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{ convert/concats a label for constants in the consts section }
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function constlabel2str(l : plabel;ctype:tconsttype):string;
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function constlabelnb2str(pnb : longint;ctype:tconsttype):string;
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procedure concat_constlabel(p:plabel;ctype:tconsttype);
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{ to be able to force to have a global label for const }
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const
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make_const_global : boolean = false;
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implementation
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uses
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systems,cobjects,verbose,globals,files,strings;
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{*****************************************************************************
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initialize/terminate the codegen for procedure and modules
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*****************************************************************************}
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procedure codegen_newprocedure;
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begin
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aktbreaklabel:=nil;
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aktcontinuelabel:=nil;
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{ aktexitlabel:=0; is store in oldaktexitlabel
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so it must not be reset to zero before this storage !}
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{ the type of this lists isn't important }
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{ because the code of this lists is }
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{ copied to the code segment }
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procinfo.aktentrycode:=new(paasmoutput,init);
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procinfo.aktexitcode:=new(paasmoutput,init);
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procinfo.aktproccode:=new(paasmoutput,init);
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procinfo.aktlocaldata:=new(paasmoutput,init);
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end;
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procedure codegen_doneprocedure;
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begin
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dispose(procinfo.aktentrycode,done);
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dispose(procinfo.aktexitcode,done);
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dispose(procinfo.aktproccode,done);
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dispose(procinfo.aktlocaldata,done);
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end;
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procedure codegen_newmodule;
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begin
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exprasmlist:=new(paasmoutput,init);
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datasegment:=new(paasmoutput,init);
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codesegment:=new(paasmoutput,init);
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bsssegment:=new(paasmoutput,init);
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debuglist:=new(paasmoutput,init);
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externals:=new(paasmoutput,init);
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internals:=new(paasmoutput,init);
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consts:=new(paasmoutput,init);
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rttilist:=new(paasmoutput,init);
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importssection:=nil;
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exportssection:=nil;
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resourcesection:=nil;
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end;
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procedure codegen_donemodule;
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begin
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dispose(exprasmlist,done);
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dispose(codesegment,done);
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dispose(bsssegment,done);
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dispose(datasegment,done);
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dispose(debuglist,done);
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dispose(externals,done);
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dispose(consts,done);
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dispose(rttilist,done);
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if assigned(importssection) then
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dispose(importssection,done);
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if assigned(exportssection) then
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dispose(exportssection,done);
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if assigned(resourcesection) then
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dispose(resourcesection,done);
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end;
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{*****************************************************************************
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Case Helpers
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*****************************************************************************}
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function case_count_labels(root : pcaserecord) : longint;
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var
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_l : longint;
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procedure count(p : pcaserecord);
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begin
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inc(_l);
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if assigned(p^.less) then
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count(p^.less);
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if assigned(p^.greater) then
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count(p^.greater);
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end;
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begin
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_l:=0;
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count(root);
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case_count_labels:=_l;
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end;
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function case_get_max(root : pcaserecord) : longint;
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var
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hp : pcaserecord;
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begin
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hp:=root;
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while assigned(hp^.greater) do
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hp:=hp^.greater;
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case_get_max:=hp^._high;
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end;
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function case_get_min(root : pcaserecord) : longint;
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var
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hp : pcaserecord;
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begin
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hp:=root;
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while assigned(hp^.less) do
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hp:=hp^.less;
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case_get_min:=hp^._low;
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end;
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{*****************************************************************************
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String Helpers
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*****************************************************************************}
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procedure generate_ascii(const hs : string);
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begin
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datasegment^.concat(new(pai_string,init(hs)))
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end;
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procedure generate_ascii_insert(const hs : string);
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begin
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datasegment^.insert(new(pai_string,init(hs)));
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end;
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function strnew(p : pchar;length : longint) : pchar;
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var
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pc : pchar;
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begin
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getmem(pc,length);
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move(p^,pc^,length);
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strnew:=pc;
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end;
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{ concates the ASCII string from pchar to the asmslist a }
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procedure generate_pascii(a : paasmoutput;hs : pchar;length : longint);
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var
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real_end,current_begin,current_end : pchar;
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c :char;
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begin
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if assigned(hs) then
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begin
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current_begin:=hs;
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real_end:=strend(hs);
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c:=hs[0];
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while length>32 do
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begin
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{ restore the char displaced }
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current_begin[0]:=c;
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current_end:=current_begin+32;
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{ store the char for next loop }
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c:=current_end[0];
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current_end[0]:=#0;
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a^.concat(new(pai_string,init_length_pchar(strnew(current_begin,32),32)));
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current_begin:=current_end;
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length:=length-32;
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end;
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current_begin[0]:=c;
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a^.concat(new(pai_string,init_length_pchar(strnew(current_begin,length),length)));
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end;
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end;
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{ inserts the ASCII string from pchar to the const segment }
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procedure generate_pascii_insert(hs : pchar;length : longint);
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var
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real_end,current_begin,current_end : pchar;
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c :char;
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begin
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if assigned(hs) then
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begin
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current_begin:=hs;
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real_end:=strend(hs);
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c:=hs[0];
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length:=longint(real_end)-longint(hs);
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while length>32 do
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begin
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{ restore the char displaced }
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current_begin[0]:=c;
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current_end:=current_begin+32;
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{ store the char for next loop }
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c:=current_end[0];
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current_end[0]:=#0;
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datasegment^.insert(new(pai_string,init_length_pchar(strnew(current_begin,32),32)));
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length:=length-32;
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end;
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datasegment^.insert(new(pai_string,init_length_pchar(strnew(current_begin,length),length)));
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end;
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end;
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{*****************************************************************************
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Const Helpers
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*****************************************************************************}
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const
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consttypestr : array[tconsttype] of string[6]=
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('ord','string','real','bool','int','char','set');
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{ Peter this gives problems for my inlines !! }
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{ we must use the number directly !!! (PM) }
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function constlabel2str(l : plabel;ctype:tconsttype):string;
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begin
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if (cs_smartlink in aktmoduleswitches) or
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make_const_global {or (aktoutputformat in [as_tasm])} then
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constlabel2str:='_$'+current_module^.modulename^+'$'+consttypestr[ctype]+'_const_'+tostr(l^.nb)
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else
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constlabel2str:=lab2str(l);
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end;
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function constlabelnb2str(pnb : longint;ctype:tconsttype):string;
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begin
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if (cs_smartlink in aktmoduleswitches) or
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make_const_global {or (aktoutputformat in [as_tasm])} then
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constlabelnb2str:='_$'+current_module^.modulename^+'$'+consttypestr[ctype]+'_const_'+tostr(pnb)
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else
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constlabelnb2str:=target_asm.labelprefix+tostr(pnb);
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end;
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procedure concat_constlabel(p:plabel;ctype:tconsttype);
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var
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s : string;
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begin
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if (cs_smartlink in aktmoduleswitches) or
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make_const_global {or (aktoutputformat in [as_tasm])} then
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begin
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s:='_$'+current_module^.modulename^+'$'+consttypestr[ctype]+'_const_'+tostr(p^.nb);
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if (cs_smartlink in aktmoduleswitches) then
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begin
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_symbol,init_global(s)))
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end
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else
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consts^.concat(new(pai_symbol,init_global(s)));
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end
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else
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consts^.concat(new(pai_label,init(p)));
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end;
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end.
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{
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$Log$
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Revision 1.12 1998-08-10 14:50:01 peter
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+ localswitches, moduleswitches, globalswitches splitting
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Revision 1.11 1998/07/28 21:52:51 florian
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+ implementation of raise and try..finally
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+ some misc. exception stuff
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Revision 1.10 1998/07/20 18:40:13 florian
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* handling of ansi string constants should now work
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Revision 1.9 1998/06/05 16:13:34 pierre
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* fix for real and string consts inside inlined procs
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Revision 1.8 1998/06/04 23:51:40 peter
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* m68k compiles
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+ .def file creation moved to gendef.pas so it could also be used
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for win32
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Revision 1.7 1998/06/04 09:55:38 pierre
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* demangled name of procsym reworked to become independant of the mangling scheme
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Revision 1.6 1998/05/23 01:21:08 peter
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+ aktasmmode, aktoptprocessor, aktoutputformat
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+ smartlink per module $SMARTLINK-/+ (like MMX) and moved to aktswitches
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+ $LIBNAME to set the library name where the unit will be put in
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* splitted cgi386 a bit (codeseg to large for bp7)
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* nasm, tasm works again. nasm moved to ag386nsm.pas
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Revision 1.5 1998/05/20 09:42:34 pierre
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+ UseTokenInfo now default
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* unit in interface uses and implementation uses gives error now
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* only one error for unknown symbol (uses lastsymknown boolean)
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the problem came from the label code !
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+ first inlined procedures and function work
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(warning there might be allowed cases were the result is still wrong !!)
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* UseBrower updated gives a global list of all position of all used symbols
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with switch -gb
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Revision 1.4 1998/05/07 00:17:01 peter
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* smartlinking for sets
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+ consts labels are now concated/generated in hcodegen
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* moved some cpu code to cga and some none cpu depended code from cga
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to tree and hcodegen and cleanup of hcodegen
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* assembling .. output reduced for smartlinking ;)
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Revision 1.3 1998/05/06 08:38:40 pierre
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* better position info with UseTokenInfo
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UseTokenInfo greatly simplified
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+ added check for changed tree after first time firstpass
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(if we could remove all the cases were it happen
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we could skip all firstpass if firstpasscount > 1)
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Only with ExtDebug
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Revision 1.2 1998/04/29 10:33:53 pierre
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+ added some code for ansistring (not complete nor working yet)
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* corrected operator overloading
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* corrected nasm output
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+ started inline procedures
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+ added starstarn : use ** for exponentiation (^ gave problems)
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+ started UseTokenInfo cond to get accurate positions
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}
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