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+ add a method to emit a reference to a pooled shortstring constant (aka one per unit); very useful for new RTTI tables to avoid poluting the binary with string constants

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git-svn-id: trunk@39683 -
This commit is contained in:
svenbarth 2018-08-29 19:20:20 +00:00
parent 0f619c3ef8
commit 8bf3661f7f
1 changed files with 53 additions and 0 deletions
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53
compiler/aasmcnst.pas
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@ -365,6 +365,9 @@ type
{ emit an ordinal constant }
procedure emit_ord_const(value: int64; def: tdef);
{ emit a reference to a pooled shortstring constant }
procedure emit_pooled_shortstring_const_ref(const str:shortstring);
{ begin a potential aggregate type. Must be called for any type
that consists of multiple tai constant data entries, or that
represents an aggregate at the Pascal level (a record, a non-dynamic
@ -1846,6 +1849,56 @@ implementation
end;
procedure ttai_typedconstbuilder.emit_pooled_shortstring_const_ref(const str:shortstring);
var
pool : thashset;
entry : phashsetitem;
strlab : tasmlabel;
l : longint;
pc : pansichar;
datadef : tdef;
strtcb : ttai_typedconstbuilder;
begin
pool:=current_asmdata.ConstPools[sp_shortstr];
entry:=pool.FindOrAdd(@str[1],length(str));
{ :-(, we must generate a new entry }
if not assigned(entry^.Data) then
begin
current_asmdata.getglobaldatalabel(strlab);
{ include length and terminating zero for quick conversion to pchar }
l:=length(str);
getmem(pc,l+2);
move(str[1],pc[1],l);
pc[0]:=chr(l);
pc[l+1]:=#0;
datadef:=carraydef.getreusable(cansichartype,l+2);
{ we start a new constbuilder as we don't know whether we're called
from inside an internal constbuilder }
strtcb:=ctai_typedconstbuilder.create([tcalo_is_lab,tcalo_make_dead_strippable,tcalo_apply_constalign]);
strtcb.maybe_begin_aggregate(datadef);
strtcb.emit_tai(Tai_string.Create_pchar(pc,l+2),datadef);
strtcb.maybe_end_aggregate(datadef);
current_asmdata.asmlists[al_typedconsts].concatList(
strtcb.get_final_asmlist(strlab,datadef,sec_rodata_norel,strlab.name,const_align(sizeof(pint)))
);
strtcb.free;
entry^.Data:=strlab;
end
else
strlab:=tasmlabel(entry^.Data);
emit_tai(tai_const.Create_sym(strlab),charpointertype);
end;
procedure ttai_typedconstbuilder.maybe_begin_aggregate(def: tdef);
begin
begin_aggregate_internal(def,false);