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What's New in C51 Version 9.55
C51 Version 9.55 Release
Release Date: 14th March 2016
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[Cx51 Compiler]
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Corrected: WARNING
C182: pointer to different objects sometimes incorrect.
Example:
int xxx[6]; int (*ptr)[6]; void main(void) { ptr = &xxx; /* The compiler erroneously throws the WARNING C182: pointer to different objects for this assignment. */ } -
Corrected: constant strings may be stored in the
memory class CODE instead of CONST.. For example:
code char str1[] = "aaaaa"; code char str2[] = "bbbbb"; char * arC; void main(void) { arC = str1; arC = "xxxxx"; } Wrong storage location for "aaaaa", "bbbbb", and "xxxxx". Correct storage location for "aaaaa", "bbbbb", and "xxxxx". ?PR?main?MAIN SEGMENT CODE ?PR?main?MAIN SEGMENT CODE ?CO?MAIN SEGMENT CODE ---------+ ?CO?MAIN SEGMENT CONST ---------+ ?DT?MAIN SEGMENT DATA | ?DT?MAIN SEGMENT DATA | EXTRN CODE (?C_STARTUP) | EXTRN CODE (?C_STARTUP) | PUBLIC arC | PUBLIC arC | PUBLIC str2 | PUBLIC str2 | PUBLIC str1 | PUBLIC str1 | PUBLIC main | PUBLIC main | | | RSEG ?DT?MAIN | RSEG ?DT?MAIN | arC: DS 3 | arC: DS 3 | RSEG ?CO?MAIN <-----------------------+ Program Code RSEG ?CO?MAIN <-----------------------+ Constant ?SC_0: ?SC_0: DB 'x' ,'x' ,'x' ,'x' ,'x' ,000H DB 'x' ,'x' ,'x' ,'x' ,'x' ,000H str1: str1: DB 'a' ,'a' ,'a' ,'a' ,'a' ,000H DB 'a' ,'a' ,'a' ,'a' ,'a' ,000H str2: str2: DB 'b' ,'b' ,'b' ,'b' ,'b' ,000H DB 'b' ,'b' ,'b' ,'b' ,'b' ,000H
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Corrected: WARNING
C182: pointer to different objects sometimes incorrect.
Example:
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[LX51 Linker/Locater]
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Added: in the LX51 map file a new section LINKER CODE
PACKING CROSS-REFERENCE shows the usage of common code
blocks from the various program segments. For example:
..... 21: if (*line == '+' || *line == '-') sign = (*line++ == '+'); 002593 EF MOV A,R7 002594 642B XRL A,#02BH 002596 6005 JZ ?C0009?CSAMPLE2 002598 D102 ACALL ?L?COM0001 <--------------------+ 00259A B42D0D CJNE A,#02DH,?C0008?CSAMPLE2 | 00259D ?C0009?CSAMPLE2: | 00259D D131 ACALL ?L?COM0002 <--------+ | 00259F 7165 ACALL ?C?CLDPTR | | 0025A1 B42B03 CJNE A,#02BH,?C0010?CSAMPLE2 | | ..... | | | | ----- FUNCTION ?L?COM0001 (BEGIN) ----- <--------------------+ 002602 90102C MOV DPTR,#line | | 002605 E0 MOVX A,@DPTR | | 002606 FB MOV R3,A | | 002607 A3 INC DPTR | | 002608 E0 MOVX A,@DPTR | | 002609 FA MOV R2,A | | 00260A A3 INC DPTR | | 00260B E0 MOVX A,@DPTR | | 00260C F9 MOV R1,A | | 00260D 6165 AJMP ?C?CLDPTR | | ----- FUNCTION ?L?COM0001 (END) ------- | | | | ----- FUNCTION ?L?COM0002 (BEGIN) ----- <--------+ | 002631 90102C MOV DPTR,#line | | 002634 E0 MOVX A,@DPTR | | 002635 FB MOV R3,A | | 002636 A3 INC DPTR | | 002637 E4 CLR A | | 002638 75F001 MOV B,#01H | | 00263B 71B8 ACALL ?C?ILDIX | | 00263D A9F0 MOV R1,B | | 00263F FA MOV R2,A | | 002640 22 RET | | ----- FUNCTION ?L?COM0002 (END) ------- | | | | | | LINKER CODE PACKING CROSS-REFERENCE LISTING | | | | NAME . . . . CLASS SIZE TYPE SEGMENT NAMES(ADDR) | | =================================================== | | | v ?L?COM0001 . CODE 000DH PART ?L?COM0001 ?PR?_ATOI?CSAMPLE2(10025B1H) ?PR?_ATOI?CSAMPLE2(1002598H) | v ?L?COM0002 . CODE 0010H PART ?L?COM0002 ?PR?_ATOI?CSAMPLE2(100259DH) ?PR?_GETLINE?CSAMPLE2(100261CH) ... ... -
Corrected: When using the SEGMENTS directive to order
segments, the order was violated (incorrect size optimization).
For example:
Assembler source: C2 SEGMENT ECODE RSEG C2 T2: DB 0x7F C1 SEGMENT ECODE SEG RSEG C1 T1: DB 0x7F C3 SEGMENT ECODE SEG RSEG C3 T3: DB 0x7F defined segment order |---------------------| LX51.EXE T1.obj TO T1.abs PRINT CLASSES(CODE(C:0X4000-C:0X8000),ECODE (C:0X4000-C:0X28000),XDATA (X:0X0000-X:0X09FF)) SEGMENTS (C3, C1, C2) START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= 010000H 010007H 000008H SEG UNIT ECODE C3 -----+--- Wrong segment order. 010008H 010008H 000001H BYTE UNIT ECODE C2 | 010009H 01FFFFH 00FFF7H --- --- **GAP** | 020000H 020000H 000001H SEG UNIT ECODE C1 -----+ START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= 010000H 010007H 000008H SEG UNIT ECODE C3 -----+--- Correct segment order. 010008H 01FFFFH 00FFF8H --- --- **GAP** | 020000H 020000H 000001H SEG UNIT ECODE C1 | 020001H 020001H 000001H BYTE UNIT ECODE C2 -----+ -
Corrected: Using the LAST in the SEGMENTS directive
was ignored for linker code packing segments. For example:
LX51 TC_0.obj, TC_1.obj TO T PRINT CLASSES (EDATA (0X0000-0X03FF), XDATA (X:0X0000-X:0X113F)) SEGMENTS (?PR?TEST2?TC_1,?PR?TEST?TC_1(LAST)) | wrong: | START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME | ========================================================================= | .... | 000087H 00008EH 000008H BYTE UNIT CODE ?L?COM0007 | 00008FH 000096H 000008H BYTE UNIT CODE ?PR?MAIN?TC_0 | 000097H --- 000000H BYTE UNIT CODE ?PR?TEST2?TC_1 | 000097H 0000AFH 000019H BYTE UNIT CODE ?PR?TEST?TC_1 <-----------------------------------------------+ 0000B0H 00011CH 00006DH BYTE UNIT CODE ?PR?_TESTDUMMYCODE?TC_1 | 00011DH 00012CH 000010H BYTE UNIT CODE ?L?COM0002 | 00012DH 000147H 00001BH BYTE UNIT CODE ?L?COM0001 | 000148H 000149H 000002H BYTE UNIT CODE ?PR?FAIL?TC_1 | | correct: | START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME | ========================================================================= | .... | 000081H 000088H 000008H BYTE UNIT CODE ?L?COM0006 | 000089H 000090H 000008H BYTE UNIT CODE ?L?COM0007 | 000091H 000098H 000008H BYTE UNIT CODE ?PR?MAIN?TC_0 | 000099H 00009AH 000002H BYTE UNIT CODE ?PR?FAIL?TC_1 | 00009BH 000107H 00006DH BYTE UNIT CODE ?PR?_TESTDUMMYCODE?TC_1 | 000108H 000117H 000010H BYTE UNIT CODE ?L?COM0002 | 000118H 000132H 00001BH BYTE UNIT CODE ?L?COM0001 | 000133H 00014BH 000019H BYTE UNIT CODE ?PR?TEST?TC_1 <-----------------------------------------------+ -
Corrected: CONST When using the SEGMENTS directive
to specify an address, the segment address was moved during
linker code packing. For example:
C-Code snippet: #pragma userclass(code = XXX) const char code xxx[30] _at_ 0x1234; LX51 CSAMPLE2.obj TO CSample CLASSES (CODE(C:0X2000-C:0X2FFF), CONST(C:0X2000-C:0X2FFF), ECODE(C:0X2000-C:0X2FFF), HCONST(C:0X2000-C:0X2FFF)) wrong: START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= 000000H 000002H 000003H --- OFFS.. CODE ?CO??C_STARTUP?0 000003H 000019H 000017H BYTE UNIT CODE_XXX ?PR?GETNUMBER?CSAMPLE2 00001AH 0000A3H 00008AH BYTE UNIT CODE_XXX ?PR?_ATOI?CSAMPLE2 0000A4H 0000B4H 000011H BYTE UNIT CODE_XXX ?PR?_GETLINE?CSAMPLE2 0000B5H 0000B6H 000002H --- --- **GAP** 0000B7H 0000D4H 00001EH BYTE OFFS.. CODE_XXX ?CO?CSAMPLE2?0 0000D5H 001FFFH 001F2BH --- --- **GAP** 002000H 002364H 000365H BYTE UNIT CODE ?PR?PRINTF?PRINTF correct: START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= 000000H 000002H 000003H --- OFFS.. CODE ?CO??C_STARTUP?0 000003H 000019H 000017H BYTE UNIT CODE_XXX ?PR?GETNUMBER?CSAMPLE2 00001AH 0000A3H 00008AH BYTE UNIT CODE_XXX ?PR?_ATOI?CSAMPLE2 0000A4H 0000B4H 000011H BYTE UNIT CODE_XXX ?PR?_GETLINE?CSAMPLE2 0000B5H 001233H 00117FH --- --- **GAP** 001234H 001251H 00001EH BYTE OFFS.. CODE_XXX ?CO?CSAMPLE2?0 001252H 001FFFH 000DAEH --- --- **GAP** 002000H 002364H 000365H BYTE UNIT CODE ?PR?PRINTF?PRINTF
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Corrected: Do not show empty segments as overlapping. For
example:
START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= 010000H 010007H 000008H SEG UNIT ECODE C3 010008H 010008H 000001H BYTE UNIT ECODE C2 *** OVERLAP *** <--- There is no real overlap because the next segment is empty 010008H --- 000000H BYTE UNIT ECODE C1
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Added: in the LX51 map file a new section LINKER CODE
PACKING CROSS-REFERENCE shows the usage of common code
blocks from the various program segments. For example:
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[µVisionVision]
- This C51 release comes with µVision V5.14.2.1.
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