tools/perf/util/dwarf-aux.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
It's confusing both pointers and arrays are printed as *. Let's print
array types with [] so that we can identify them easily. Although it's
interchangable, sometimes it can cause confusion with size like in the
below example.
Note that it is not the same with C syntax where it goes to the variable
names, but we want to have it in the type names (like in Go language).
Before:
mov [20] 0x68(reg5) -> reg0 type='struct page**' size=0x80 (die:0x4e61d32)
After:
mov [20] 0x68(reg5) -> reg0 type='struct page*[]' size=0x80 (die:0x4e61d32)
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/dwarf-aux.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index c0a492e65388..ec988f294497 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -1110,8 +1110,10 @@ int die_get_typename_from_type(Dwarf_Die *type_die, struct strbuf *buf)
const char *tmp = "";
tag = dwarf_tag(type_die);
- if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
+ if (tag == DW_TAG_pointer_type)
tmp = "*";
+ else if (tag == DW_TAG_array_type)
+ tmp = "[]";
else if (tag == DW_TAG_subroutine_type) {
/* Function pointer */
return strbuf_add(buf, "(function_type)", 15);
--
2.45.0.rc1.225.g2a3ae87e7f-goog
On Mon, 6 May 2024 21:13:38 -0700 Namhyung Kim <namhyung@kernel.org> wrote: > It's confusing both pointers and arrays are printed as *. Let's print > array types with [] so that we can identify them easily. Although it's > interchangable, sometimes it can cause confusion with size like in the > below example. > > Note that it is not the same with C syntax where it goes to the variable > names, but we want to have it in the type names (like in Go language). > > Before: > mov [20] 0x68(reg5) -> reg0 type='struct page**' size=0x80 (die:0x4e61d32) > > After: > mov [20] 0x68(reg5) -> reg0 type='struct page*[]' size=0x80 (die:0x4e61d32) > Good improvement! Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Thank you! > Cc: Masami Hiramatsu <mhiramat@kernel.org> > Signed-off-by: Namhyung Kim <namhyung@kernel.org> > --- > tools/perf/util/dwarf-aux.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c > index c0a492e65388..ec988f294497 100644 > --- a/tools/perf/util/dwarf-aux.c > +++ b/tools/perf/util/dwarf-aux.c > @@ -1110,8 +1110,10 @@ int die_get_typename_from_type(Dwarf_Die *type_die, struct strbuf *buf) > const char *tmp = ""; > > tag = dwarf_tag(type_die); > - if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) > + if (tag == DW_TAG_pointer_type) > tmp = "*"; > + else if (tag == DW_TAG_array_type) > + tmp = "[]"; > else if (tag == DW_TAG_subroutine_type) { > /* Function pointer */ > return strbuf_add(buf, "(function_type)", 15); > -- > 2.45.0.rc1.225.g2a3ae87e7f-goog > -- Masami Hiramatsu (Google) <mhiramat@kernel.org>
On Wed, May 08, 2024 at 08:57:51AM +0900, Masami Hiramatsu wrote: > On Mon, 6 May 2024 21:13:38 -0700 > Namhyung Kim <namhyung@kernel.org> wrote: > > > It's confusing both pointers and arrays are printed as *. Let's print > > array types with [] so that we can identify them easily. Although it's > > interchangable, sometimes it can cause confusion with size like in the > > below example. > > > > Note that it is not the same with C syntax where it goes to the variable > > names, but we want to have it in the type names (like in Go language). > > > > Before: > > mov [20] 0x68(reg5) -> reg0 type='struct page**' size=0x80 (die:0x4e61d32) > > > > After: > > mov [20] 0x68(reg5) -> reg0 type='struct page*[]' size=0x80 (die:0x4e61d32) > > > > Good improvement! > > Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Indeed, Thanks, applied to perf-tools-next, - Arnaldo
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