Add python 3.7 support

- Also switch the used PPA for travis. The PPA which contains recent
python versions is ppa:deadsnakes/ppa [1]

[1] https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa

Author: toabctl

.travis.yml

@@ -12,11 +12,12 @@ env:
     - PYVERSION=python3.4
     - PYVERSION=python3.5
     - PYVERSION=python3.6
+    - PYVERSION=python3.7
 
 addons:
   apt:
     sources:
-      - sourceline: 'ppa:fkrull/deadsnakes'
+      - sourceline: 'ppa:deadsnakes/ppa'
       - autotools-dev
       - libtool
       - pkg-config

configure.ac

@@ -111,7 +111,12 @@ PKG_CHECK_MODULES([PY36], [python-3.6], [enable_py36="yes"], [AC_MSG_WARN([Build
 AM_CONDITIONAL([ENABLE_PY36], [test x"$enable_py36" = xyes])
 AM_COND_IF([ENABLE_PY36], [AC_DEFINE([ENABLE_PY36], [1], [Python 3.6 will be enabled])])
 
-AS_IF([test x"$enable_py26" = xyes -o x"$enable_py34" = xyes -o x"$enable_py36" = xyes],
+enable_py37=no
+PKG_CHECK_MODULES([PY37], [python-3.7], [enable_py37="yes"], [AC_MSG_WARN([Building without Python 3.7 support])])
+AM_CONDITIONAL([ENABLE_PY37], [test x"$enable_py37" = xyes])
+AM_COND_IF([ENABLE_PY37], [AC_DEFINE([ENABLE_PY37], [1], [Python 3.7 will be enabled])])
+
+AS_IF([test x"$enable_py26" = xyes -o x"$enable_py34" = xyes -o x"$enable_py36" = xyes -o x"$enable_py37" = xyes],
       [AC_MSG_NOTICE([Found at least one copy of Python.h])],
       [AC_MSG_ERROR([Failed to find a supported Python.h])]
 )
@@ -127,7 +132,8 @@ echo
 echo "  with threads        = $enable_threads"
 echo "  with Python 2.6/7   = $enable_py26"
 echo "  with Python 3.4/5   = $enable_py34"
-echo "  with Python 3.6+    = $enable_py36"
+echo "  with Python 3.6    = $enable_py36"
+echo "  with Python 3.7+    = $enable_py37"
 echo
 echo "  CXX                 = $CXX"
 echo "  CXXFLAGS            = $CXXFLAGS"

src/Makefile.am

@@ -34,3 +34,10 @@ libfrob36_la_CXXFLAGS = $(PY36_CFLAGS)
 noinst_LTLIBRARIES += libfrob36.la
 pyflame_LDADD += libfrob36.la
 endif
+
+if ENABLE_PY37
+libfrob37_la_SOURCES = frob37.cc
+libfrob37_la_CXXFLAGS = $(PY37_CFLAGS)
+noinst_LTLIBRARIES += libfrob37.la
+pyflame_LDADD += libfrob37.la
+endif

src/frob.cc

@@ -89,6 +89,22 @@ unsigned long ByteData(unsigned long addr) {
   return addr + offsetof(PyBytesObject, ob_sval);
 }
 
+#elif PYFLAME_PY_VERSION == 37
+namespace py36 {
+std::string StringDataPython3(pid_t pid, unsigned long addr);
+
+unsigned long StringSize(unsigned long addr) {
+  return addr + offsetof(PyVarObject, ob_size);
+}
+
+std::string StringData(pid_t pid, unsigned long addr) {
+  return StringDataPython3(pid, addr);
+}
+
+unsigned long ByteData(unsigned long addr) {
+  return addr + offsetof(PyBytesObject, ob_sval);
+}
+
 #else
 static_assert(false, "uh oh, bad PYFLAME_PY_VERSION");
 #endif

src/frob37.cc

@@ -0,0 +1,18 @@
+// Copyright 2019 SUSE Linux GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// ABI for Python 3.7
+#define PYFLAME_PY_VERSION 37
+
+#include "./frob.cc"

src/prober.cc

@@ -79,6 +79,9 @@ static const int build_abis[] = {
 #ifdef ENABLE_PY36
     36,
 #endif
+#ifdef ENABLE_PY37
+    37,
+#endif
 };
 
 static_assert(sizeof(build_abis) > 0, "No Python ABIs detected!");

src/pyfrob.cc

@@ -126,6 +126,12 @@ FROB_FUNCS
 }
 #endif
 
+#ifdef ENABLE_PY37
+namespace py37 {
+FROB_FUNCS
+}
+#endif
+
 // Fill the addrs_ member
 int PyFrob::set_addrs_(PyABI *abi) {
   Namespace ns(pid_);

src/symbol.h

@@ -53,7 +53,8 @@ enum class PyABI {
   Unknown = 0,  // Unknown Python ABI
   Py26 = 26,    // ABI for Python 2.6/2.7
   Py34 = 34,    // ABI for Python 3.4/3.5
-  Py36 = 36     // ABI for Python 3.6
+  Py36 = 36,    // ABI for Python 3.6
+  Py37 = 37     // ABI for Python 3.7
 };
 
 // Symbols