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* tcg.a_load_cgparaloc_ref checks the size of the ref exactly to avoid overwriting of adjacent data

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git-svn-id: trunk@36951 -
This commit is contained in:
florian 2017-08-20 15:21:59 +00:00
parent 9b3e0a80df
commit 43b017bde0
1 changed files with 123 additions and 51 deletions
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76
compiler/cgobj.pas
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@ -1103,7 +1103,7 @@ implementation
caller side and needs to be stored with those bytes at the
start of the reference -> don't shift right }
else if (paraloc.shiftval<0) and
((-paraloc.shiftval) in [1,2,4]) then
((-paraloc.shiftval) in [8,16,32]) then
begin
a_op_const_reg_reg(list,OP_SHR,OS_INT,-paraloc.shiftval,paraloc.register,paraloc.register);
{ convert to a register of 1/2/4 bytes in size, since the
@ -1113,7 +1113,79 @@ implementation
hreg:=getintregister(list,cgsize);
a_load_reg_reg(list,OS_INT,cgsize,paraloc.register,hreg);
end;
a_load_reg_ref(list,paraloc.size,cgsize,hreg,ref);
{ use the exact size to avoid overwriting of adjacent data }
if tcgsize2size[cgsize]<=sizeleft then
a_load_reg_ref(list,paraloc.size,cgsize,hreg,ref)
else
case sizeleft of
1,2,4,8:
a_load_reg_ref(list,paraloc.size,int_cgsize(sizeleft),hreg,ref);
3:
begin
if target_info.endian=endian_big then
begin
href:=ref;
inc(href.offset,2);
a_load_reg_ref(list,paraloc.size,OS_8,hreg,href);
a_op_const_reg_reg(list,OP_SHR,OS_INT,8,hreg,hreg);
a_load_reg_ref(list,paraloc.size,OS_16,hreg,ref);
end
else
{ little endian not implemented yet }
Internalerror(2017081301);
end;
5:
begin
if target_info.endian=endian_big then
begin
href:=ref;
inc(href.offset,4);
a_load_reg_ref(list,paraloc.size,OS_8,hreg,href);
a_op_const_reg_reg(list,OP_SHR,OS_INT,8,hreg,hreg);
a_load_reg_ref(list,paraloc.size,OS_32,hreg,ref);
end
else
{ little endian not implemented yet }
Internalerror(2017081302);
end;
6:
begin
if target_info.endian=endian_big then
begin
href:=ref;
inc(href.offset,4);
a_load_reg_ref(list,paraloc.size,OS_16,hreg,href);
a_op_const_reg_reg(list,OP_SHR,OS_INT,16,hreg,hreg);
a_load_reg_ref(list,paraloc.size,OS_32,hreg,ref);
end
else
{ little endian not implemented yet }
Internalerror(2017081303);
end;
7:
begin
if target_info.endian=endian_big then
begin
href:=ref;
inc(href.offset,6);
a_load_reg_ref(list,paraloc.size,OS_8,hreg,href);
a_op_const_reg_reg(list,OP_SHR,OS_INT,8,hreg,hreg);
href:=ref;
inc(href.offset,4);
a_load_reg_ref(list,paraloc.size,OS_16,hreg,href);
a_op_const_reg_reg(list,OP_SHR,OS_INT,16,hreg,hreg);
a_load_reg_ref(list,paraloc.size,OS_32,hreg,ref);
end
else
{ little endian not implemented yet }
Internalerror(2017081304);
end;
else
{ other sizes not allowed }
Internalerror(2017080901);
end;
end;
LOC_MMREGISTER :
begin