Microchip Technology XC8 Standard Compiler (Workstation) SW006021-1 SW006021-1 ユーザーズマニュアル
製品コード
SW006021-1
Macro Assembler
2012 Microchip Technology Inc.
DS52053B-page 275
The code generator also produces a warning if the maximum stack depth appears to
have been exceeded. For the above reasons, this warning, too, is intended to be a only
a guide to potential stack problems.
have been exceeded. For the above reasons, this warning, too, is intended to be a only
a guide to potential stack problems.
6.6.6.2
CALL GRAPH CRITICAL PATHS
Immediately prior to the call graph tables in the list file are the critical paths for memory
usage identified in the call graphs. A critical path is printed for each memory space and
for each call graph. Look for a line similar to Critical Paths under _main in BANK0,
which, for this example, indicates the critical path for the main function (the root of one
call graph) in bank 0 memory. There will be one call graph for the function main and
another for each interrupt function, and each of these will appear for every memory
space the device defines.
usage identified in the call graphs. A critical path is printed for each memory space and
for each call graph. Look for a line similar to Critical Paths under _main in BANK0,
which, for this example, indicates the critical path for the main function (the root of one
call graph) in bank 0 memory. There will be one call graph for the function main and
another for each interrupt function, and each of these will appear for every memory
space the device defines.
A critical path here represents the biggest range of APBs stacked together in as a con-
tiguous block. Essentially, it identifies those functions whose APBs are contributing to
the program’s memory usage in that particular memory space. If you can reduce the
memory usage of these functions in the corresponding memory space, then you will
affects the program’s total memory usage in that memory space.
tiguous block. Essentially, it identifies those functions whose APBs are contributing to
the program’s memory usage in that particular memory space. If you can reduce the
memory usage of these functions in the corresponding memory space, then you will
affects the program’s total memory usage in that memory space.
This information may be presented as follows.
3793 ;; Critical Paths under _main in BANK0
3794 ;;
3795 ;; _main->_foobar
3796 ;; _foobar->___flsub
3797 ;; ___flsub->___fladd
In this example, it shows that of all the call graph paths starting from the function main,
the path in which main calls foobar, which calls flsub, which calls fladd, is using
the largest block of memory in bank 0 RAM. The exact memory usage of each function
is shown in the call graph tables.
the path in which main calls foobar, which calls flsub, which calls fladd, is using
the largest block of memory in bank 0 RAM. The exact memory usage of each function
is shown in the call graph tables.
The memory used by functions that are not in the critical path will overlap entirely with
that in the critical path. Reducing the memory usage of these will have no impact on
the memory usage of the entire program.
that in the critical path. Reducing the memory usage of these will have no impact on
the memory usage of the entire program.