-
Enhancement
-
Resolution: Won't Implement
-
Not Prioritized
-
Code Generation Tools
-
CODEGEN-10699
-
-
C2000_22.6.0.LTS
-
default
-
The attached C++ file has these lines ...
const cPARA_INFO pg6[] = {
//----------------------------------------------------------------------------------
// DEF, MinL, MinH ,MaxL , MaxH, Type | Attr (all Paras in P5 Gp is 32 bits)
//----------------------------------------------------------------------------------
cPARA_INFO( 0,0x0000,0X0000,0xff3f,0xFFFF, 0x6000 ,Para_Func_NULL,((int*)&PR_Homing) ), // P6-00
cPARA_INFO( 0,0x0000,0X8000,0xffff,0x7FFF, 0x2000 ,Para_Func_NULL,((int*)&PR_Homing)+2), // P6-01
cPARA_INFO( 0,0x0000,0X0000,0xffff,0xFFFF, 0x6000 ,Para_Func_P6_02_3,((int*)PR_Point) ), // P6-02
cPARA_INFO( 0,0x0000,0X8000,0xffff,0x7FFF, 0x2000 ,Para_Func_P6_02_3,((int*)PR_Point)+ 2), // P6-03
cPARA_INFO( 0,0x0000,0X0000,0xffff,0xFFFF, 0x6000 ,Para_Func_P6_04_5,((int*)PR_Point)+ 4), // P6-04
/* and so on */
Note it is const. The length of this array is important. Make it shorter, and the problem disappears.
Use a very old version 3.07 of the compiler. Build it ...
% cl2000 -@options.txt file.cpp
Inspect the assembly file. This array begins ...
.sect ".econst" .align 2 _pg6: .field 0,32 ; _pg6[0]._DEF @ 0 .field 0,16 ; _pg6[0]._MIN @ 32 .field 0,16 ; _pg6[0]._MAX @ 48 .field -193,16 ; _pg6[0]._NUM @ 64 .field -1,16 ; _pg6[0]._DEN @ 80 .field 24576,16 ; _pg6[0]._TYP @ 96
The entire array is initialized with this entry in the .econst section.
Build it again with version 22.6.0.LTS. Inspect the assembly file to see ...
_pg6: .usect ".ebss:_pg6",900,0,1 .clink ".ebss:_pg6"
Even though pg6 is const, it is in the .ebss section. It gets initialized by a large function, the address of which is added to the .pinit section. This method requires much more memory, and it does not allow pg6 to be allocated to flash.
