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| author | Antonio Nino Diaz <antonio.ninodiaz@arm.com> | 2017-05-16 09:52:02 +0100 |
|---|---|---|
| committer | Antonio Nino Diaz <antonio.ninodiaz@arm.com> | 2017-05-16 09:58:08 +0100 |
| commit | 0da2fe7e29380f1b45286ae8a5a999547d250d33 (patch) | |
| tree | 9ff074119a21f48cb7c82bef5fadbdf52f64f0d0 /docs | |
| parent | 823cc7a9d28aa77a8329f7581bb91038935b4df8 (diff) | |
Simplify assert() to reduce memory usage
The behaviour of assert() now depends on the value of the new optional
platform define `PLAT_LOG_LEVEL_ASSERT`. This defaults to `LOG_LEVEL` if
not defined by the platform.
- If `PLAT_LOG_LEVEL_ASSERT` >= `LOG_LEVEL_VERBOSE`, it prints the file
name, line and asserted expression.
- If `PLAT_LOG_LEVEL_ASSERT` >= `LOG_LEVEL_INFO`, it prints the file
name and line.
- If not, it doesn't print anything.
Note the old behaviour was to print the function name whereas now it
prints the file name. This reduces memory usage because the file name is
shared between all assert calls in a given file. Also, the default
behaviour in debug builds is to no longer print the asserted expression,
greatly reducing the string usage.
For FVP debug builds this change saves approximately:
No TBBR TBBR
BL1 1.6 KB 2.2 KB
BL2 1.7 KB 2.1 KB
BL31 2.6 KB 3.3 KB
Change-Id: I2947569d593df0b25611dc3c7a6096f42155c115
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/porting-guide.md | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index 0189ec40..4d7a5ead 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -535,6 +535,17 @@ optionally be defined: PLAT_PARTITION_MAX_ENTRIES := 12 $(eval $(call add_define,PLAT_PARTITION_MAX_ENTRIES)) +The following constant is optional. It should be defined to override the default +behaviour of the `assert()` function (for example, to save memory). + +* **PLAT_LOG_LEVEL_ASSERT** + If `PLAT_LOG_LEVEL_ASSERT` is higher or equal than `LOG_LEVEL_VERBOSE`, + `assert()` prints the name of the file, the line number and the asserted + expression. Else if it is higher than `LOG_LEVEL_INFO`, it prints the file + name and the line number. Else if it is lower than `LOG_LEVEL_INFO`, it + doesn't print anything to the console. If `PLAT_LOG_LEVEL_ASSERT` isn't + defined, it defaults to `LOG_LEVEL`. + ### File : plat_macros.S [mandatory] |