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libcpp: Improvements to description of source_location in line-map.h 

libcpp/ChangeLog:
	* include/line-map.h (source_location): In the table in the
	descriptive comment, show UNKNOWN_LOCATION, BUILTINS_LOCATION,
	LINE_MAP_MAX_LOCATION_WITH_COLS, LINE_MAP_MAX_SOURCE_LOCATION.
	Add notes about ad-hoc values.

From-SVN: r229673
This commit is contained in:
David Malcolm 2015-11-02 19:47:03 +00:00 committed by David Malcolm
parent 5c1a2e639a
commit 525ce91010
2 changed files with 25 additions and 5 deletions
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7
libcpp/ChangeLog
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@ -1,3 +1,10 @@
2015-11-02 David Malcolm <dmalcolm@redhat.com>
* include/line-map.h (source_location): In the table in the
descriptive comment, show UNKNOWN_LOCATION, BUILTINS_LOCATION,
LINE_MAP_MAX_LOCATION_WITH_COLS, LINE_MAP_MAX_SOURCE_LOCATION.
Add notes about ad-hoc values.
2015-10-21 Mikhail Maltsev <maltsevm@gmail.com>
* include/line-map.h: Use CHECKING_P instead of ENABLE_CHECKING.

23
libcpp/include/line-map.h
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@ -59,8 +59,10 @@ typedef unsigned int linenum_type;
Actual | Value | Meaning
-----------+-------------------------------+-------------------------------
0x00000000 | | Reserved for use by libcpp
0x00000001 | RESERVED_LOCATION_COUNT - 1 | Reserved for use by libcpp
0x00000000 | UNKNOWN_LOCATION (gcc/input.h)| Unknown/invalid location.
-----------+-------------------------------+-------------------------------
0x00000001 | BUILTINS_LOCATION | The location for declarations
| (gcc/input.h) | in "<built-in>"
-----------+-------------------------------+-------------------------------
0x00000002 | RESERVED_LOCATION_COUNT | The first location to be
| (also | handed out, and the
@ -94,6 +96,16 @@ typedef unsigned int linenum_type;
|
| (unallocated integers)
|
0x60000000 | LINE_MAP_MAX_LOCATION_WITH_COLS
| Beyond this point, ordinary linemaps have 0 bits per column:
| each increment of the value corresponds to a new source line.
|
0x70000000 | LINE_MAP_MAX_SOURCE_LOCATION
| Beyond the point, we give up on ordinary maps; attempts to
| create locations in them lead to UNKNOWN_LOCATION (0).
|
| (unallocated integers)
|
| Macro maps grow this way
| ^^^^^^^^^^^^^^^^^^^^^^^^
| |
@ -107,10 +119,11 @@ typedef unsigned int linenum_type;
| macromap[1]->start_location | Start of macro map 1
-----------+-------------------------------+-------------------------------
| macromap[0]->start_location | Start of macro map 0
0x7fffffff | MAX_SOURCE_LOCATION |
0x7fffffff | MAX_SOURCE_LOCATION | Also used as a mask for
| | accessing the ad-hoc data table
-----------+-------------------------------+-------------------------------
0x80000000 | Start of ad-hoc values |
... | |
0x80000000 | Start of ad-hoc values; the lower 31 bits are used as an index
... | into the line_table->location_adhoc_data_map.data array.
0xffffffff | UINT_MAX |
-----------+-------------------------------+-------------------------------