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Add doc for INLINE and INLINE_ORIGIN records in symbol file

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Change-Id: Iacf98d4e1a6f4c75e552eaa879f330be7976547e
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/3268351
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
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Zequan Wu 2021-11-08 14:42:48 -08:00 committed by Joshua Peraza
parent 622a582fa6
commit 42d2475617
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docs/symbol_files.md
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@ -105,6 +105,22 @@ which other records (line records, in particular) can use to refer to that file
name. The _number_ field is a decimal number. The _name_ field is the name of
the file; it may contain spaces.
# `INLINE_ORIGIN` records
An `INLINE_ORIGIN` record holds an inline function name for `INLINE` records to
refer to. It has the form:
> `INLINE_ORIGIN` _number_ _name_
For example: `INLINE_ORIGIN 2 nsQueryInterfaceWithError::operator()(nsID const&,
void**) const
`
An `INLINE_ORIGIN` record provides the name of an inline function, and assigns
it a number which other records (`INLINE` records, in particular) can use to
refer to that function name. The _number_ field is a decimal number. The _name_
field is the name of the inline function; it may contain spaces.
# `FUNC` records
A `FUNC` record describes a source-language function. It has the form:
@ -136,6 +152,49 @@ The _name_ field is the name of the function. In languages that use linker
symbol name mangling like C++, this should be the source language name (the
"unmangled" form). This field may contain spaces.
# `INLINE` records
An `INLINE` record describes the inline function's nest level, call site line
and call site source file to which the given ranges of machine code should be
attributed. It has the form:
> `INLINE` _inline_nest_level_ _call_site_line_ _call_site_file_num_
> _origin_num_ [_address_ _size_]+
For example: `INLINE 0 10 3 4 d30 2a fa1 b
`
The _inline_nest_level_ field is a decimal number that means it's inlined at the
function described by a previous `INLINE` record which has _inline_nest_level_
one less than its. In the example below, first and third `INLINE` records have
_inline_nest_level_ 0, which means they are inlined inside the function
described by the `FUNC` record. The second `INLINE` record has
_inline_nest_level_ 1 means that it's inlined at the inline function described
by first `INLINE` record.
```
FUNC ...
INLINE 0 ...
INLINE 1 ...
INLINE 0 ...
```
The _call_site_line_ and _call_site_file_num_ fields are decimal numbers
indicating where this inline function being called at.
The _origin_num_ field refers to an `INLINE_ORIGIN` record that has the name
of the inline function.
The _address_ and _size_ fields are hexadecimal numbers indicating the start
address and length in bytes of the machine code. The address is relative to the
module's load address. There could be more than one [_address_ _size_] range
pair, since inline functions could have discontinuous address ranges. The ranges
of an `INLINE` record are always inside the ranges described by its parent
record (a `FUNC` record or an `INLINE` record).
The `INLINE` record is assumed to belong to the function described by the last
preceding `FUNC` record. `INLINE` records may not appear before the first `FUNC`
record.
# Line records
A line record describes the source file and line number to which a given range