pahole: Prep 1.21

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

CMakeLists.txt

@@ -33,9 +33,9 @@ set(CMAKE_C_FLAGS_DEBUG "-Wall -Werror -ggdb -O0")
 set(CMAKE_C_FLAGS_RELEASE "-Wall -O2")
 
 # Just for grepping, DWARVES_VERSION isn't used anywhere anymore
-# add_definitions(-D_GNU_SOURCE -DDWARVES_VERSION="v1.20")
+# add_definitions(-D_GNU_SOURCE -DDWARVES_VERSION="v1.21")
 add_definitions(-D_GNU_SOURCE -DDWARVES_MAJOR_VERSION=1)
-add_definitions(-D_GNU_SOURCE -DDWARVES_MINOR_VERSION=20)
+add_definitions(-D_GNU_SOURCE -DDWARVES_MINOR_VERSION=21)
 find_package(DWARF REQUIRED)
 find_package(ZLIB REQUIRED)
 

MANIFEST

@@ -51,6 +51,7 @@ changes-v1.17
 changes-v1.18
 changes-v1.19
 changes-v1.20
+changes-v1.21
 COPYING
 NEWS
 README

NEWS

@@ -1,3 +1,23 @@
+v1.21:
+
+Fri Apr  9 2021
+
+ae0b7dde1fd50b12 dwarf_loader: Handle DWARF5 DW_OP_addrx properly
+9adb014930f31c66 dwarf_loader: Handle subprogram ret type with abstract_origin properly
+5752d1951d081a80 dwarf_loader: Check .notes section for LTO build info
+209e45424ff4a22d dwarf_loader: Check .debug_abbrev for cross-CU references
+39227909db3cc2c2 dwarf_loader: Permit merging all DWARF CU's for clang LTO built binary
+763475ca1101ccfe dwarf_loader: Factor out common code to initialize a cu
+d0d3fbd4744953e8 dwarf_loader: Permit a flexible HASHTAGS__BITS
+ffe0ef4d73906c18 btf: Add --btf_gen_all flag
+de708b33114d42c2 btf: Add support for the floating-point types
+4b7f8c04d009942b fprintf: Honour conf_fprintf.hex when printing enumerations
+f2889ff163726336 Avoid warning when building with NDEBUG
+8e1f8c904e303d5d btf_encoder: Match ftrace addresses within ELF functions
+9fecc77ed82d429f dwarf_loader: Use a better hashing function, from libbpf
+0125de3a4c055cdf btf_encoder: Funnel ELF error reporting through a macro
+7d8e829f636f47ab btf_encoder: Sanitize non-regular int base type
+
 v1.20:
 
 Tue Feb  2 2021

changes-v1.21

@@ -0,0 +1,70 @@
+DWARF loader:
+
+- Handle DWARF5 DW_OP_addrx properly
+
+  Part of the effort to support the subset of DWARF5 that is generated when building the kernel.
+
+- Handle subprogram ret type with abstract_origin properly
+
+  Adds a second pass to resolve abstract origin DWARF description of functions to aid
+  the BTF encoder in getting the right return type.
+
+- Check .notes section for LTO build info
+
+  When LTO is used, currently only with clang, we need to do extra steps to handle references
+  from one object (compile unit, aka CU) to another, a way for DWARF to avoid duplicating
+  information.
+
+- Check .debug_abbrev for cross-CU references
+
+  When the kernel build process doesn't add an ELF note in vmlinux indicating that LTO was
+  used and thus intra-CU references are present and thus we need to use a more expensive
+  way to resolve types and (again) thus to encode BTF, we need to look at DWARF's .debug_abbrev
+  ELF section to figure out if such intra-CU references are present.
+
+- Permit merging all DWARF CU's for clang LTO built binary
+
+  Allow not trowing away previously supposedly self contained compile units
+  (objects, aka CU, aka Compile Units) as they have type descriptions that will
+  be used in later CUs.
+
+- Permit a flexible HASHTAGS__BITS
+
+  So that we can use a more expensive algorithm when we need to keep previously processed
+  compile units that will then be referenced by later ones to resolve types.
+
+- Use a better hashing function, from libbpf
+
+  Enabling patch to combine compile units when using LTO.
+
+BTF encoder:
+
+- Add --btf_gen_all flag
+
+  A new command line to allow asking for the generation of all BTF encodings, so that we
+  can stop adding new command line options to enable new encodings in the kernel Makefile.
+
+- Match ftrace addresses within ELF functions
+
+  To cope with differences in how DWARF and ftrace describes function boundaries.
+
+- Funnel ELF error reporting through a macro
+
+  To use libelf's elf_error() function, improving error messages.
+
+- Sanitize non-regular int base type
+
+  Cope with clang with dwarf5 non-regular int base types, tricky stuff, see yhs
+  full explanation in the relevant cset.
+
+- Add support for the floating-point types
+
+  S/390 has floats'n'doubles in its arch specific linux headers, cope with that.
+
+Pretty printer:
+
+- Honour conf_fprintf.hex when printing enumerations
+
+  If the user specifies --hex in the command line, honour it when printing enumerations.
+
+Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

rpm/SPECS/dwarves.spec

@@ -2,7 +2,7 @@
 %define libver 1
 
 Name: dwarves
-Version: 1.20
+Version: 1.21
 Release: 1%{?dist}
 License: GPLv2
 Summary: Debugging Information Manipulation Tools (pahole & friends)
@@ -79,7 +79,7 @@ rm -Rf %{buildroot}
 %files
 %doc README.ctracer
 %doc README.btf
-%doc changes-v1.20
+%doc changes-v1.21
 %doc NEWS
 %{_bindir}/btfdiff
 %{_bindir}/codiff
@@ -134,7 +134,27 @@ rm -Rf %{buildroot}
 %{_libdir}/%{libname}_reorganize.so
 
 %changelog
-* Tue Feb  2 2021 Arnaldo Carvalho de Melo <acme@redhat.com> - 1.20-1
+* Fri Apr 9 2021 Arnaldo Carvalho de Melo <acme@redhat.com> - 1.21-1
+- New release: v1.21
+- DWARF loader:
+- Handle DWARF5 DW_OP_addrx properly
+- Handle subprogram ret type with abstract_origin properly
+- Check .notes section for LTO build info
+- Check .debug_abbrev for cross-CU references
+- Permit merging all DWARF CU's for clang LTO built binary
+- Factor out common code to initialize a cu
+- Permit a flexible HASHTAGS__BITS
+- Use a better hashing function, from libbpf
+- btf_encoder:
+- Add --btf_gen_all flag
+- Match ftrace addresses within ELF functions
+- Funnel ELF error reporting through a macro
+- Sanitize non-regular int base type
+- Add support for the floating-point types
+- Pretty printer:
+- Honour conf_fprintf.hex when printing enumerations
+
+* Tue Feb 2 2021 Arnaldo Carvalho de Melo <acme@redhat.com> - 1.20-1
 - New release: v1.20
 - btf_encoder:
 - Improve ELF error reporting using elf_errmsg(elf_errno())