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639 lines
19 KiB
ObjectPascal
639 lines
19 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 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 cgbase;
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{$i fpcdefs.inc}
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interface
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uses
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{ common }
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cclasses,
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{ global }
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globals,verbose,
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{ symtable }
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symconst,symtype,symdef,symsym,
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{ aasm }
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cpubase,cpuinfo,cginfo,aasmbase,aasmtai
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;
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const
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{# bitmask indicating if the procedure uses asm }
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pi_uses_asm = $1;
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{# bitmask indicating if the procedure is exported by an unit }
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pi_is_global = $2;
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{# bitmask indicating if the procedure does a call }
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pi_do_call = $4;
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{# bitmask indicating if the procedure is an operator }
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pi_operator = $8;
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{# bitmask indicating if the procedure is an external C function }
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pi_c_import = $10;
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{# bitmask indicating if the procedure has a try statement = no register optimization }
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pi_uses_exceptions = $20;
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{# bitmask indicating if the procedure is declared as @var(assembler), don't optimize}
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pi_is_assembler = $40;
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{# bitmask indicating if the procedure contains data which needs to be finalized }
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pi_needs_implicit_finally = $80;
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type
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pprocinfo = ^tprocinfo;
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tprocinfo = object
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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 : tobjectdef;
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{# the definition of the routine itself }
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procdef : tprocdef;
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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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selfpointer_offset : longint;
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{# result value offset in stack (functions only) }
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return_offset : longint;
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{# firsttemp position }
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firsttemp_offset : longint;
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{# parameter offset in stack }
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para_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 a 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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{# true, if we can not use fast exit code }
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no_fast_exit : boolean;
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{# Holds the environment reference for default exceptions
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The exception reference is created when ansistrings
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or classes are used. It holds buffer for exception
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frames. It is allocted by g_new_exception.
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}
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exception_env_ref : treference;
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{# Holds the environment reference for default exceptions
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The exception reference is created when ansistrings
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or classes are used. It holds buffer for setjmp
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It is allocted by g_new_exception.
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}
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exception_jmp_ref :treference;
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{# Holds the environment reference for default exceptions
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The exception reference is created when ansistrings
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or classes are used. It holds the location where
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temporary storage of the setjmp result is stored.
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This reference can be nil, if the result is instead
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saved on the stack.
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}
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exception_result_ref :treference;
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aktproccode,aktentrycode,
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aktexitcode,aktlocaldata : taasmoutput;
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constructor init;
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destructor done;
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end;
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pregvarinfo = ^tregvarinfo;
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tregvarinfo = record
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regvars : array[1..maxvarregs] of tvarsym;
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regvars_para : array[1..maxvarregs] of boolean;
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regvars_refs : array[1..maxvarregs] of longint;
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fpuregvars : array[1..maxfpuvarregs] of tvarsym;
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fpuregvars_para : array[1..maxfpuvarregs] of boolean;
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fpuregvars_refs : array[1..maxfpuvarregs] of longint;
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end;
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var
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{# information about the current sub routine being parsed (@var(pprocinfo))}
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procinfo : pprocinfo;
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{ labels for BREAK and CONTINUE }
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aktbreaklabel,aktcontinuelabel : tasmlabel;
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{ label when the result is true or false }
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truelabel,falselabel : tasmlabel;
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{ label to leave the sub routine }
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aktexitlabel : tasmlabel;
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{ also an exit label, only used we need to clear only the stack }
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aktexit2label : tasmlabel;
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{# only used in constructor for fail keyword or if getmem fails }
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faillabel : tasmlabel;
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quickexitlabel : tasmlabel;
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{# true, if there was an error while code generation occurs }
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codegenerror : boolean;
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{ save the size of pushed parameter, needed for aligning }
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pushedparasize : longint;
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{ message calls with codegenerror support }
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procedure cgmessage(t : longint);
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procedure cgmessage1(t : longint;const s : string);
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procedure cgmessage2(t : longint;const s1,s2 : string);
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procedure cgmessage3(t : longint;const s1,s2,s3 : string);
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procedure CGMessagePos(const pos:tfileposinfo;t:longint);
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procedure CGMessagePos1(const pos:tfileposinfo;t:longint;const s1:string);
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procedure CGMessagePos2(const pos:tfileposinfo;t:longint;const s1,s2:string);
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procedure CGMessagePos3(const pos:tfileposinfo;t:longint;const s1,s2,s3:string);
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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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{# From a definition return the abstract code generator size (@var(tcgsize) enum). It is
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to note that the value returned can be @var(OS_NO) }
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function def_cgsize(def: tdef): tcgsize;
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function int_cgsize(const l: aword): tcgsize;
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{# return the inverse condition of opcmp }
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function inverse_opcmp(opcmp: topcmp): topcmp;
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{# return whether op is commutative }
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function commutativeop(op: topcg): boolean;
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implementation
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uses
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systems,
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cresstr,
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rgobj,
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defbase
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{$ifdef fixLeaksOnError}
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,comphook
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{$endif fixLeaksOnError}
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;
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{$ifdef fixLeaksOnError}
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var procinfoStack: TStack;
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hcodegen_old_do_stop: tstopprocedure;
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{$endif fixLeaksOnError}
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{*****************************************************************************
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override the message calls to set codegenerror
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*****************************************************************************}
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procedure cgmessage(t : longint);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.Message(t);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessage1(t : longint;const s : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.Message1(t,s);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessage2(t : longint;const s1,s2 : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.Message2(t,s1,s2);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessage3(t : longint;const s1,s2,s3 : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.Message3(t,s1,s2,s3);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessagepos(const pos:tfileposinfo;t : longint);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.MessagePos(pos,t);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessagepos1(const pos:tfileposinfo;t : longint;const s1 : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.MessagePos1(pos,t,s1);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessagepos2(const pos:tfileposinfo;t : longint;const s1,s2 : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.MessagePos2(pos,t,s1,s2);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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procedure cgmessagepos3(const pos:tfileposinfo;t : longint;const s1,s2,s3 : string);
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var
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olderrorcount : longint;
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begin
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if not(codegenerror) then
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begin
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olderrorcount:=Errorcount;
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verbose.MessagePos3(pos,t,s1,s2,s3);
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codegenerror:=olderrorcount<>Errorcount;
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end;
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end;
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{****************************************************************************
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TProcInfo
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****************************************************************************}
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constructor tprocinfo.init;
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begin
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parent:=nil;
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_class:=nil;
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procdef:=nil;
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framepointer_offset:=0;
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selfpointer_offset:=0;
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return_offset:=0;
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firsttemp_offset:=0;
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para_offset:=0;
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flags:=0;
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framepointer:=R_NO;
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globalsymbol:=false;
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exported:=false;
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no_fast_exit:=false;
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aktentrycode:=Taasmoutput.Create;
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aktexitcode:=Taasmoutput.Create;
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aktproccode:=Taasmoutput.Create;
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aktlocaldata:=Taasmoutput.Create;
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reference_reset(exception_env_ref);
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reference_reset(exception_jmp_ref);
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reference_reset(exception_result_ref);
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end;
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destructor tprocinfo.done;
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begin
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aktentrycode.free;
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aktexitcode.free;
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aktproccode.free;
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aktlocaldata.free;
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end;
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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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{ new procinfo }
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new(procinfo,init);
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{$ifdef fixLeaksOnError}
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procinfoStack.push(procinfo);
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{$endif fixLeaksOnError}
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end;
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procedure codegen_doneprocedure;
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begin
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{$ifdef fixLeaksOnError}
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if procinfo <> procinfoStack.pop then
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writeln('problem with procinfoStack!');
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{$endif fixLeaksOnError}
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dispose(procinfo,done);
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procinfo:=nil;
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end;
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procedure codegen_newmodule;
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begin
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exprasmlist:=taasmoutput.create;
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datasegment:=taasmoutput.create;
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codesegment:=taasmoutput.create;
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bsssegment:=taasmoutput.create;
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debuglist:=taasmoutput.create;
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withdebuglist:=taasmoutput.create;
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consts:=taasmoutput.create;
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rttilist:=taasmoutput.create;
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ResourceStringList:=Nil;
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importssection:=nil;
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exportssection:=nil;
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resourcesection:=nil;
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{ assembler symbols }
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asmsymbollist:=tdictionary.create;
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asmsymbollist.usehash;
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{ resourcestrings }
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ResourceStrings:=TResourceStrings.Create;
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end;
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procedure codegen_donemodule;
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{$ifdef MEMDEBUG}
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var
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d : tmemdebug;
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{$endif}
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begin
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{$ifdef MEMDEBUG}
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d:=tmemdebug.create('asmlist');
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{$endif}
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exprasmlist.free;
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codesegment.free;
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bsssegment.free;
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datasegment.free;
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debuglist.free;
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withdebuglist.free;
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consts.free;
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rttilist.free;
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if assigned(ResourceStringList) then
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ResourceStringList.free;
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if assigned(importssection) then
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importssection.free;
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if assigned(exportssection) then
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exportssection.free;
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if assigned(resourcesection) then
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resourcesection.free;
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{$ifdef MEMDEBUG}
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d.free;
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{$endif}
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{ assembler symbols }
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{$ifdef MEMDEBUG}
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d:=tmemdebug.create('asmsymbol');
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{$endif}
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asmsymbollist.free;
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{$ifdef MEMDEBUG}
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d.free;
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{$endif}
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{ resource strings }
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ResourceStrings.free;
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end;
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function def_cgsize(def: tdef): tcgsize;
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begin
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case def.deftype of
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orddef,
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enumdef,
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setdef:
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begin
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result := int_cgsize(def.size);
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if is_signed(def) then
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result := tcgsize(ord(result)+(ord(OS_S8)-ord(OS_8)));
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end;
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classrefdef,
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pointerdef,
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procvardef:
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result := OS_ADDR;
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stringdef :
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begin
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if is_ansistring(def) or is_widestring(def) then
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result := OS_ADDR
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else
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result := OS_NO;
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end;
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objectdef :
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begin
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if is_class_or_interface(def) then
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result := OS_ADDR
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else
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result := OS_NO;
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end;
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floatdef:
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result := tfloat2tcgsize[tfloatdef(def).typ];
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recorddef :
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result:=int_cgsize(def.size);
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arraydef :
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begin
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if not is_special_array(def) then
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result := int_cgsize(def.size)
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else
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result := OS_NO;
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end;
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else
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begin
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{ undefined size }
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result:=OS_NO;
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end;
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end;
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end;
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function int_cgsize(const l: aword): tcgsize;
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begin
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case l of
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1 :
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result := OS_8;
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2 :
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result := OS_16;
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3,4 :
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result := OS_32;
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5..8 :
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result := OS_64;
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else
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result:=OS_NO;
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end;
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end;
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function inverse_opcmp(opcmp: topcmp): topcmp;
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const
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list: array[TOpCmp] of TOpCmp =
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(OC_NONE,OC_NE,OC_LTE,OC_GTE,OC_LT,OC_GT,OC_EQ,OC_A,OC_AE,
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OC_B,OC_BE);
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begin
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inverse_opcmp := list[opcmp];
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end;
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function commutativeop(op: topcg): boolean;
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const
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list: array[topcg] of boolean =
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(true,true,true,false,false,true,true,false,false,
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true,false,false,false,false,true);
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begin
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commutativeop := list[op];
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end;
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{$ifdef fixLeaksOnError}
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procedure hcodegen_do_stop;
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var p: pprocinfo;
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begin
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p := pprocinfo(procinfoStack.pop);
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while p <> nil Do
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begin
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dispose(p,done);
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p := pprocinfo(procinfoStack.pop);
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end;
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procinfoStack.done;
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do_stop := hcodegen_old_do_stop;
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do_stop{$ifdef FPCPROCVAR}(){$endif};
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end;
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begin
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hcodegen_old_do_stop := do_stop;
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do_stop := {$ifdef FPCPROCVAR}@{$endif}hcodegen_do_stop;
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procinfoStack.init;
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{$endif fixLeaksOnError}
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end.
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{
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$Log$
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Revision 1.20 2002-08-04 19:06:41 carl
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+ added generic exception support (still does not work!)
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+ more documentation
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Revision 1.19 2002/07/20 11:57:53 florian
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* types.pas renamed to defbase.pas because D6 contains a types
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unit so this would conflicts if D6 programms are compiled
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+ Willamette/SSE2 instructions to assembler added
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Revision 1.18 2002/07/01 18:46:22 peter
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* internal linker
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* reorganized aasm layer
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Revision 1.17 2002/05/20 13:30:40 carl
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* bugfix of hdisponen (base must be set, not index)
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* more portability fixes
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Revision 1.16 2002/05/18 13:34:05 peter
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* readded missing revisions
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Revision 1.15 2002/05/16 19:46:35 carl
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+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
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+ try to fix temp allocation (still in ifdef)
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+ generic constructor calls
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+ start of tassembler / tmodulebase class cleanup
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Revision 1.13 2002/04/25 20:16:38 peter
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* moved more routines from cga/n386util
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Revision 1.12 2002/04/21 15:28:06 carl
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- remove duplicate constants
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- move some constants to cginfo
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Revision 1.11 2002/04/20 21:32:23 carl
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+ generic FPC_CHECKPOINTER
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+ first parameter offset in stack now portable
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* rename some constants
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+ move some cpu stuff to other units
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- remove unused constents
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* fix stacksize for some targets
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* fix generic size problems which depend now on EXTEND_SIZE constant
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Revision 1.10 2002/04/07 09:13:39 carl
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+ documentation
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- remove unused variables
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Revision 1.9 2002/04/04 19:05:54 peter
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* removed unused units
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* use tlocation.size in cg.a_*loc*() routines
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Revision 1.8 2002/04/02 17:11:27 peter
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* tlocation,treference update
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* LOC_CONSTANT added for better constant handling
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* secondadd splitted in multiple routines
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* location_force_reg added for loading a location to a register
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of a specified size
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* secondassignment parses now first the right and then the left node
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(this is compatible with Kylix). This saves a lot of push/pop especially
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with string operations
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* adapted some routines to use the new cg methods
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Revision 1.7 2002/03/31 20:26:33 jonas
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+ a_loadfpu_* and a_loadmm_* methods in tcg
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* register allocation is now handled by a class and is mostly processor
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independent (+rgobj.pas and i386/rgcpu.pas)
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* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
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* some small improvements and fixes to the optimizer
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* some register allocation fixes
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* some fpuvaroffset fixes in the unary minus node
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* push/popusedregisters is now called rg.save/restoreusedregisters and
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(for i386) uses temps instead of push/pop's when using -Op3 (that code is
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also better optimizable)
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* fixed and optimized register saving/restoring for new/dispose nodes
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* LOC_FPU locations now also require their "register" field to be set to
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R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
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- list field removed of the tnode class because it's not used currently
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and can cause hard-to-find bugs
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Revision 1.6 2002/03/04 19:10:11 peter
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* removed compiler warnings
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}
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