From 73b9be8b5301c4ac056e10c38a47414867ee892a Mon Sep 17 00:00:00 2001 From: Keith Seitz Date: Wed, 6 Sep 2017 12:50:52 -0700 Subject: [PATCH] Introduce dw2_linkage_name and dw2_linkage_name_attr. The DWARF reader is littered with the following idiom to read a linkage name from the debug info: mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu); if (mangled == NULL) mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); This patch introduces functions to simplify this to: mangled = dw2_linkage_name (die, cu); or attr = dw2_linkage_name_attr (die, cu); gdb/ChangeLog: * dwarf2read.c (dw2_linkage_name_attr): New function. (dw2_linkage_name): New function. (dwarf2_compute_name, dwarf2_physname, read_call_site_scope) (guess_full_die_structure_name, dwarf2_name): Use dw2_linkage_name. (anonymous_struct_prefix, dwarf2_name): Use dw2_linkage_name_attr. --- gdb/ChangeLog | 8 +++++++ gdb/dwarf2read.c | 64 +++++++++++++++++++++++++++++++++----------------------- 2 files changed, 46 insertions(+), 26 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index ed66547..8080a55 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2017-09-06 Keith Seitz + + * dwarf2read.c (dw2_linkage_name_attr): New function. + (dw2_linkage_name): New function. + (dwarf2_compute_name, dwarf2_physname, read_call_site_scope) + (guess_full_die_structure_name, dwarf2_name): Use dw2_linkage_name. + (anonymous_struct_prefix, dwarf2_name): Use dw2_linkage_name_attr. + 2017-09-06 Kamil Rytarowski * config/djgpp/djconfig.sh: Correct shell portability issue. diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c index 6678b33..b3c5fab 100644 --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -8732,6 +8732,38 @@ die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) } } +/* Return the DIE's linkage name attribute, either DW_AT_linkage_name + or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not + defined for the given DIE. */ + +static struct attribute * +dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu) +{ + struct attribute *attr; + + attr = dwarf2_attr (die, DW_AT_linkage_name, cu); + if (attr == NULL) + attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); + + return attr; +} + +/* Return the DIE's linkage name as a string, either DW_AT_linkage_name + or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not + defined for the given DIE. */ + +static const char * +dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu) +{ + const char *linkage_name; + + linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu); + if (linkage_name == NULL) + linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); + + return linkage_name; +} + /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, compute the physname for the object, which include a method's: - formal parameters (C++), @@ -8771,11 +8803,8 @@ dwarf2_compute_name (const char *name, to be able to reference. Ideally, we want the user to be able to reference this entity using either natural or linkage name, but we haven't started looking at this enhancement yet. */ - const char *linkage_name; + const char *linkage_name = dw2_linkage_name (die, cu); - linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu); - if (linkage_name == NULL) - linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); if (linkage_name != NULL) return linkage_name; } @@ -9016,9 +9045,7 @@ dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu) back_to = make_cleanup (null_cleanup, NULL); - mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu); - if (mangled == NULL) - mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); + mangled = dw2_linkage_name (die, cu); /* rustc emits invalid values for DW_AT_linkage_name. Ignore these. See https://github.com/rust-lang/rust/issues/32925. */ @@ -12053,13 +12080,7 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) const char *target_physname; /* Prefer the mangled name; otherwise compute the demangled one. */ - target_physname = dwarf2_string_attr (target_die, - DW_AT_linkage_name, - target_cu); - if (target_physname == NULL) - target_physname = dwarf2_string_attr (target_die, - DW_AT_MIPS_linkage_name, - target_cu); + target_physname = dw2_linkage_name (target_die, target_cu); if (target_physname == NULL) target_physname = dwarf2_physname (NULL, target_die, target_cu); if (target_physname == NULL) @@ -19924,12 +19945,8 @@ guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu) { if (child->tag == DW_TAG_subprogram) { - const char *linkage_name; + const char *linkage_name = dw2_linkage_name (child, cu); - linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu); - if (linkage_name == NULL) - linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name, - cu); if (linkage_name != NULL) { char *actual_name @@ -19984,9 +20001,7 @@ anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu) if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL) return NULL; - attr = dwarf2_attr (die, DW_AT_linkage_name, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); + attr = dw2_linkage_name_attr (die, cu); if (attr == NULL || DW_STRING (attr) == NULL) return NULL; @@ -20312,10 +20327,7 @@ dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) { char *demangled = NULL; - attr = dwarf2_attr (die, DW_AT_linkage_name, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); - + attr = dw2_linkage_name_attr (die, cu); if (attr == NULL || DW_STRING (attr) == NULL) return NULL; -- 2.7.4