File 3471-erts-Implement-some-etp-macros-for-lldb.patch of Package erlang

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File 3471-erts-Implement-some-etp-macros-for-lldb.patch of Package erlang (Revision 9cfc7361ef11aa2c9e03afdf25519fb7)

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From b33f540d866de8770ebe42a0a3a580557b51aaa8 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 24 Mar 2021 10:03:09 +0100
Subject: [PATCH] erts: Implement some etp macros for lldb

The etp macros only work for gdb and Apple has made it
almost impossible to install gdb, so in order to debug
we need working lldb macros.

This commit ports the most important macros to lldb so
that we can more easily do some basic debugging.

Co-authored-by: Anthony Ramine <n.oxyde@gmail.com>
---
 erts/etc/unix/cerl.src |  20 ++
 erts/etc/unix/etp.py   | 652 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 672 insertions(+)
 create mode 100644 erts/etc/unix/etp.py

diff --git a/erts/etc/unix/cerl.src b/erts/etc/unix/cerl.src
index f617736e43..adc20f5ac6 100644
--- a/erts/etc/unix/cerl.src
+++ b/erts/etc/unix/cerl.src
@@ -34,6 +34,8 @@
 #               You have to start beam in gdb using "run".
 #   -rgdb       Run the debug compiled emulator in gdb.
 #               You have to start beam in gdb using "run".
+#   -lldb       Run the debug compiled emulator in lldb.
+#               You have to start beam in lldb using "run".
 #   -dump       Dump the bt of all threads in a core.
 #   -break F    Run the debug compiled emulator in emacs and gdb and set break.
 #               The session is started, i.e. "run" is already don for you.
@@ -170,6 +172,10 @@ while [ $# -gt 0 ]; do
 	    shift
 	    GDB=gdb
 	    ;;
+    "-lldb")
+        shift
+        GDB=lldb
+        ;;
 	"-break")
 	    shift
 	    GDB=gdb
@@ -421,6 +427,20 @@ elif [ "x$GDB" = "xgdb" ]; then
     echo "source $ROOTDIR/erts/etc/unix/etp-commands" > $cmdfile
     # Fire up gdb in emacs...
     exec gdb $GDBBP -x $cmdfile $gdbcmd
+elif [ "x$GDB" = "xlldb" ]; then
+    case "x$core" in
+        x)
+            beam_args=`$EXEC -emu_args_exit ${1+"$@"}`
+            lldbcmd="-- $beam_args"
+            ;;
+        *)
+            lldbcmd="--core ${core}"
+            ;;
+    esac
+    cmdfile="/tmp/.cerllldb.$$"
+    echo "env TERM=dumb" > $cmdfile
+    echo "command script import $ROOTDIR/erts/etc/unix/etp.py" >> $cmdfile
+    exec lldb -s $cmdfile $EMU_NAME $lldbcmd
 elif [ "x$GDB" = "xegdb" ]; then
     if [ "x$EMACS" = "x" ]; then
 	EMACS=emacs
diff --git a/erts/etc/unix/etp.py b/erts/etc/unix/etp.py
new file mode 100644
index 0000000000..ca8a15d69d
--- /dev/null
+++ b/erts/etc/unix/etp.py
@@ -0,0 +1,652 @@
+# coding=utf-8
+#
+# %CopyrightBegin%
+# 
+# Copyright Ericsson AB 2013-2022. All Rights Reserved.
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# 
+# %CopyrightEnd%
+#
+#
+# This script was orinally written by Anthony Ramine (aka nox) in 2013
+# A lot of things have changed since then, but the same base remains.
+#
+
+import re
+import lldb
+import shlex
+
+unquoted_atom_re = re.compile(u'^[a-zß-öø-ÿ][a-zA-Zß-öø-ÿ0-9@]*$')
+
+def __lldb_init_module(debugger, internal_dict):
+    debugger.HandleCommand('type format add -f hex Eterm')
+    debugger.HandleCommand('type format add -f hex BeamInstr')
+    debugger.HandleCommand('type summary add -F etp.eterm_summary Eterm')
+    debugger.HandleCommand('command script add -f etp.processes_cmd etp-processes')
+    debugger.HandleCommand('command script add -f etp.process_info_cmd etp-process-info')
+    debugger.HandleCommand('command script add -f etp.stacktrace_cmd etp-stacktrace')
+    debugger.HandleCommand('command script add -f etp.stackdump_cmd etp-stackdump')
+    debugger.HandleCommand('command script add -f etp.eterm_cmd etp')
+
+####################################
+## Print all processes in the system
+####################################
+def processes_cmd(debugger, command, result, internal_dict):
+    target = debugger.GetSelectedTarget()
+    proc = erts_proc(target)
+    proc_r_o = proc.GetChildMemberWithName('r').GetChildMemberWithName('o')
+    proc_max_ix = proc_r_o.GetChildMemberWithName('max')
+    proc_tab = proc_r_o.GetChildMemberWithName('tab').Cast(ProcessPtrPtr(target))
+    proc_cnt = proc.GetChildMemberWithName('vola').GetChildMemberWithName('tile').GetChildMemberWithName('count').GetChildMemberWithName('counter').unsigned
+    invalid_proc = global_var('erts_invalid_process', target).address_of
+    for proc_ix in range(0, proc_max_ix.unsigned):
+        proc = offset(proc_ix, proc_tab).deref
+        if proc.unsigned != 0 and proc.unsigned != invalid_proc.unsigned:
+            print('---')
+            print('  Pix: %d' % proc_ix)
+            process_info(proc)
+            proc_cnt -= 1
+            if proc_cnt == 0:
+                break
+
+############################################
+## Print process-info about a single process
+############################################
+def process_info_cmd(debugger, command, result, internal_dict):
+    target = debugger.GetSelectedTarget()
+    proc = target.process.selected_thread.GetSelectedFrame().EvaluateExpression(command).Cast(ProcessPtr(target))
+    process_info(proc)
+
+def process_info(proc):
+    print('  Pid: %s' % eterm(proc.GetChildMemberWithName('common').GetChildMemberWithName('id')))
+    print('  State: %s' % process_state(proc))
+    print('  Flags: %s' % process_flags(proc))
+    current = proc.GetChildMemberWithName('current')
+    if current.unsigned != 0 and proc.GetChildMemberWithName('state').GetChildMemberWithName('counter').unsigned & 0x800 == 0:
+        print('  Current function: %s' % mfa(current))
+    else:
+        print('  Current function: %s' % 'unknown')
+    i = proc.GetChildMemberWithName('i')
+    if i.unsigned != 0:
+        print('  I: %s' % eterm(i))
+    else:
+        print('  I: %s' % 'unknown')
+    print('  Pointer: %#x' % proc.unsigned)
+
+def process_state(proc):
+    state = proc.GetChildMemberWithName('state').unsigned
+    res = ''
+    if state & 0x80000000:
+        res += "GARBAGE<0x80000000> | "
+    if state & 0x40000000:
+        res += "dirty-running-sys | "
+    if state & 0x20000000:
+        res += "dirty-running | "
+    if state & 0x10000000:
+        res += "dirty-active-sys | "
+    if state & 0x8000000:
+        res += "dirty-io-proc | "
+    if state & 0x4000000:
+        res += "dirty-cpu-proc | "
+    if state & 0x2000000:
+        res += "sig-q | "
+    if state & 0x1000000:
+        res += "off-heap-msgq | "
+    if state & 0x800000:
+        res += "delayed-sys | "
+    if state & 0x400000:
+        res += "proxy | "
+        proxy_process = True
+    else:
+        proxy_process = False
+    if state & 0x200000:
+        res += "running-sys | "
+    if state & 0x100000:
+        res += "active-sys | "
+    if state & 0x80000:
+        res += "sig-in-q | "
+    if state & 0x40000:
+        res += "sys-tasks | "
+    if state & 0x20000:
+        res += "garbage-collecting | "
+    if state & 0x10000:
+        res += "suspended | "
+    if state & 0x8000:
+        res += "running | "
+    if state & 0x4000:
+        res += "in-run-queue | "
+    if state & 0x2000:
+        res += "active | "
+    if state & 0x1000:
+        res += "unused | "
+    if state & 0x800:
+        res += "exiting | "
+    if state & 0x400:
+        res += "free | "
+    if state & 0x200:
+        res += "in-prq-low | "
+    if state & 0x100:
+        res += "in-prq-normal | "
+    if state & 0x80:
+        res += "in-prq-high | "
+    if state & 0x40:
+        res += "in-prq-max | "
+    if state & 0x30 == 0x0:
+        res += "prq-prio-max | "
+    elif state & 0x30 == 0x10:
+      res += "prq-prio-high | "
+    elif state & 0x30 == 0x20:
+        res += "prq-prio-normal | "
+    else:
+        res += "prq-prio-low | "
+    if state & 0xc == 0x0:
+        res += "usr-prio-max | "
+    elif state & 0xc == 0x4:
+      res += "usr-prio-high | "
+    elif state & 0xc == 0x8:
+        res += "usr-prio-normal | "
+    else:
+        res += "usr-prio-low | "
+    if state & 0x3 == 0x0:
+        res += "act-prio-max"
+    elif state & 0x3 == 0x1:
+      res += "act-prio-high"
+    elif state & 0x3 == 0x2:
+        res += "act-prio-normal"
+    else:
+        res += "act-prio-low"
+    return res
+
+def process_flags(proc):
+    flags = proc.GetChildMemberWithName('flags').unsigned
+    res = ''
+    if flags & ~((1 << 24)-1):
+        res += "GARBAGE<%#x> " % (flags & ~((1 << 24)-1))
+    if flags & (1 << 22):
+        res += "trap-exit "
+    if flags & (1 << 21):
+        res += "hibernated "
+    if flags & (1 << 20):
+        res += "dirty-minor-gc "
+    if flags & (1 << 19):
+        res += "dirty-major-gc "
+    if flags & (1 << 18):
+        res += "dirty-gc-hibernate "
+    if flags & (1 << 17):
+        res += "dirty-cla "
+    if flags & (1 << 16):
+        res += "delayed-del-proc "
+    if flags & (1 << 15):
+        res += "have-blocked-nmsb "
+    if flags & (1 << 14):
+        res += "shdlr-onln-wait-q "
+    if flags & (1 << 13):
+        res += "delay-gc "
+    if flags & (1 << 12):
+        res += "abandoned-heap-use "
+    if flags & (1 << 11):
+        res += "disable-gc "
+    if flags & (1 << 10):
+        res += "force-gc "
+    if flags & (1 << 9):
+        res += "ets-super-user "
+    if flags & (1 << 8):
+        res += "have-blocked-msb "
+    if flags & (1 << 7):
+        res += "using-ddll "
+    if flags & (1 << 6):
+        res += "distribution "
+    if flags & (1 << 5):
+        res += "using-db "
+    if flags & (1 << 4):
+        res += "need-fullsweep "
+    if flags & (1 << 3):
+        res += "heap-grow "
+    if flags & (1 << 2):
+        res += "timo "
+    if flags & (1 << 1):
+        res += "inslpqueue "
+    if flags & (1 << 0):
+        res += "hibernate-sched "
+    return res
+
+############################################
+## Print the stacktrace of a single process
+############################################
+def stacktrace_cmd(debugger, command, result, internal_dict):
+    target = debugger.GetSelectedTarget()
+    proc = target.process.selected_thread.GetSelectedFrame().EvaluateExpression(command).Cast(ProcessPtr(target))
+    stackdump(proc, False)
+
+############################################
+## Print the stackdump of a single process
+############################################
+def stackdump_cmd(debugger, command, result, internal_dict):
+    target = debugger.GetSelectedTarget()
+    proc = target.process.selected_thread.GetSelectedFrame().EvaluateExpression(command).Cast(ProcessPtr(target))
+    stackdump(proc, True)
+
+def stackdump(proc, dump):
+    stop = proc.GetChildMemberWithName('stop')
+    send = proc.GetChildMemberWithName('hend')
+    cnt = 0
+    if proc.GetChildMemberWithName('state').GetChildMemberWithName('counter').unsigned & 0x8000:
+        print('%%%%%% WARNING: The process is currently running, so c_p->stop will not be correct')
+    print(F'%% Stacktrace ({send.unsigned - stop.unsigned})');
+    i = proc.GetChildMemberWithName('i')
+    if i.unsigned != 0:
+        print(F'I: {eterm(i)}')
+    while stop.unsigned < send.unsigned:
+        if stop.deref.unsigned & 0x3 == 0x0 or dump:
+            print(F'{cnt}: {eterm(stop.deref)}')
+        cnt += 1
+        stop = offset(1, stop)
+
+############################################
+## Print an eterm
+############################################
+def eterm_cmd(debugger, command, result, internal_dict):
+    args = shlex.split(command)
+    target = debugger.GetSelectedTarget()
+    term = target.process.selected_thread.GetSelectedFrame().EvaluateExpression(args[0]).Cast(EtermPtr(target))
+    if len(args) >= 2:
+        print(eterm(term, int(args[1])))
+    else:
+        print(eterm(term))
+
+############################################
+## Print the summary of an Eterm
+############################################
+def eterm_summary(valobj, internal_dict):
+    if valobj.TypeIsPointerType():
+        return ''
+    return F'{valobj.unsigned:#x} {eterm(valobj, 5)}'
+
+def eterm(valobj, depth = float('inf')):
+    val = valobj.unsigned
+    tag = val & 0x3
+    if tag == 0x1:
+        return cons(valobj, depth)
+    elif tag == 0x2:
+        return boxed(valobj, depth)
+    elif tag == 0x3:
+        return imm(valobj)
+    elif val == 0x0:
+        return '<the non-value>'
+    elif val == 0x4:
+        return '<the non-value debug>'
+    else:
+        return cp(valobj)
+
+def cons(valobj, depth = float('inf')):
+    items = []
+    cdr = valobj
+    improper = False
+    truncated = False
+    depth *= 20
+    
+    while True:
+        ptr = cdr.CreateValueFromData(
+            "unconsed",
+            lldb.SBData.CreateDataFromInt(cdr.unsigned - 1),
+            EtermPtr(cdr.target))
+        items.append((ptr.deref, depth // 20)); # Append depth, car
+        if ptr.deref.unsigned & 0xF == 0xF:
+            depth -= 1
+        else:
+            depth -= 20
+        cdr = offset(1,ptr).deref
+        if is_nil(cdr):
+            break
+        if cdr.unsigned & 0x1 == 0:
+            improper = True
+            break
+        if depth <= 1:
+            truncated = True
+            break
+
+    if improper:
+        return '#ImproperList'
+
+    ## Try to print as ascii first
+    chars = ''
+    isprintable = True
+    for car, car_depth in items:
+        if car.unsigned & 0xF == 0xF:
+            if car.unsigned >> 4 == 10:
+                chars += '\\n'
+            elif car.unsigned >> 4 == 9:
+                chars += '\\t'
+            else:
+                chars += f'{car.unsigned >> 4:c}'
+        else:
+            isprintable = False
+            break
+    isprintable = isprintable and chars.isprintable()
+    if isprintable:
+        if not truncated:
+            return F'"{chars}"'
+        else:
+            return F'"{chars}..."'
+
+    ## If not printable, we print the objects
+    objs = []
+    chars = '['
+    for car, car_depth in items:
+        objs.append(eterm(car, car_depth))
+    if not truncated:
+        return '[' + ','.join(objs) + ']'
+    else:
+        return '[' + ','.join(objs) + '|...]'
+
+def boxed(valobj, depth = float('inf')):
+    ptr = valobj.CreateValueFromData(
+        "unboxed",
+        lldb.SBData.CreateDataFromInt(valobj.unsigned - 2),
+        EtermPtr(valobj.target))
+    boxed_hdr = ptr.deref.unsigned
+    if boxed_hdr & 0x3f == 0x00:
+        arity = (boxed_hdr >> 6)
+        terms = []
+        for x in range(1, arity+1):
+            if depth <= 1:
+                terms.append('...')
+                break
+            depth -= 1
+            terms.append(eterm(offset(x, ptr).deref, depth))
+        res = ','.join(terms)
+        return F"{{{res}}}"
+    if boxed_hdr & 0x3c == 0x3c:
+        if boxed_hdr & 0xc0 == 0x0:
+            return "flat_map"
+        else:
+            return "hash_map"
+    boxed_type = (boxed_hdr >> 2) & 0xF
+    if boxed_type == 0xC:
+        return '#ExternalPid'
+    if boxed_type == 0xD:
+        return '#ExternalPort'
+    if boxed_type == 0x2 or boxed_type == 0x3:
+        return '#Bignum'
+    if boxed_type == 0x6:
+        return '#Float'
+    if boxed_type == 0x4:
+        return '#Ref'
+    if boxed_type == 0xE:
+        return '#ExternalRef'
+    if boxed_type == 0x5:
+        return '#Fun'
+    if boxed_type == 0x8:
+        return '#RefcBin'
+    if boxed_type == 0x9:
+        return '#HeapBin'
+    if boxed_type == 0xA:
+        return '#SubBin'
+    return F'#Boxed<{valobj.unsigned}>'
+
+def imm(valobj):
+    val = valobj.unsigned
+    if (val & 0x3) != 3:
+        return '#NotImmediate<%#x>' % val
+    tag = val & 0xF
+    if tag == 0x3:
+        return pid(valobj)
+    elif tag == 0x7:
+        return port(valobj)
+    elif tag == 0xF:
+        return str(val >> 4)
+    elif tag == 0xB:
+        # Immediate2
+        tag2 = val & 0x3F
+        if tag2 == 0x0B:
+            return atom(valobj)
+        elif tag2 == 0x1B:
+            return F'#Catch<{val>>6:#x}>'
+        elif is_nil(valobj):
+            return '[]'
+    return '#UnknownImmediate<%#x>' % val
+
+# Continuation pointers
+
+def cp(valobj):
+    mfaptr = erts_lookup_function_info(valobj)
+    if mfaptr == None:
+        return '#Cp<%#x>' % valobj.unsigned
+    else:
+        return '#Cp<%s>' % mfa(mfaptr)
+
+# Pids and ports
+
+def pid(valobj):
+    val = valobj.unsigned
+    if (val & 0xF) == 0x3:
+        target = valobj.target
+        if etp_arch_bits(target) == 64:
+            if etp_big_endian(target):
+                data = (val >> 35) & 0x0FFFFFFF
+            else:
+                data = (val >> 4) & 0x0FFFFFFF
+        else:
+            data = pixdata2data(valobj)
+        return '<0.%u.%u>' % (data & 0x7FFF, (data >> 15) & 0x1FFF)
+    else:
+        return '#NotPid<%#x>' % val
+
+def port(valobj):
+    val = valobj.unsigned
+    if (val & 0xF) == 0x7:
+        target = valobj.target
+        if etp_arch_bits(target) == 64 and not etp_halfword(target):
+            if etp_big_endian(target):
+                data = (val >> 36) & 0x0FFFFFFF
+            else:
+                data = (val >> 4) & 0x0FFFFFFF
+        else:
+            data = pixdata2data(valobj)
+        return '#Port<0.%u>' % data
+    else:
+        return '#NotPort<%#x>' % val
+
+# Strings and atoms
+
+def atom(valobj):
+    val = valobj.unsigned
+    if (val & 0x3F) == 0x0B:
+        name = atom_name(atom_tab(valobj))
+        if unquoted_atom_re.match(name):
+            return str(name)
+        else:
+            return quoted_name(name, "'")
+    else:
+        return '#NotAtom<%#x>' % val
+
+def atom_name(entry):
+    name = entry.GetChildMemberWithName('name')
+    length = entry.GetChildMemberWithName('len').unsigned
+    data = name.GetPointeeData(0, length).uint8s
+    return ''.join(map(chr, data))
+
+def quoted_name(name, quote):
+    return quote + ''.join(map(lambda c: quoted_char(c, quote), name)) + quote
+
+def quoted_char(c, quote):
+    point = ord(c)
+    if c == quote:
+        return '\\' + quote
+    elif point == 0x08:
+        return '\\b'
+    elif point == 0x09:
+        return '\\t'
+    elif point == 0x0A:
+        return '\\n'
+    elif point == 0x0B:
+        return '\\v'
+    elif point == 0x0C:
+        return '\\f'
+    elif point == 0x0D:
+        return '\\e'
+    elif point >= 0x20 and point <= 0x7E or point >= 0xA0:
+        return c
+    elif (point > 0xFF):
+        return '#NotChar<%#x>' % c
+    else:
+        return '\\%03o' % point
+
+# Constants
+
+MI_FUNCTIONS = 13
+MI_NUM_FUNCTIONS = 0
+
+def is_nil(value):
+    ## We handle both -5 and 0x3b as NIL values so that this script
+    ## works with more versions
+    return value.signed == -5 or value.unsigned == 0x3b
+
+# Types
+
+def Atom(target):
+    return target.FindFirstType('Atom')
+
+def Char(target):
+    return target.FindFirstType('char')
+def CharPtr(target):
+    return Char(target).GetPointerType()
+
+def Eterm(target):
+    return target.FindFirstType('Eterm')
+def EtermPtr(target):
+    return Eterm(target).GetPointerType()
+def EtermPtrPtr(target):
+    return EtermPtr(target).GetPointerType()
+
+def Range(target):
+    return target.FindFirstType('Range')
+
+def BeamInstr(target):
+    return target.FindFirstType('BeamInstr')
+def BeamInstrPtr(target):
+    return BeamInstr(target).GetPointerType()
+
+def ErtsCodeInfo(target):
+    return target.FindFirstType('ErtsCodeInfo')
+def ErtsCodeInfoPtr(target):
+    return ErtsCodeInfo(target).GetPointerType()
+
+def Process(target):
+    return target.FindFirstType('Process')
+def ProcessPtr(target):
+    return Process(target).GetPointerType()
+def ProcessPtrPtr(target):
+    return ProcessPtr(target).GetPointerType()
+
+# Globals
+
+def erts_atom_table(target):
+    return global_var('erts_atom_table', target)
+
+def erts_proc(target):
+    return global_var('erts_proc', target)
+
+def etp_arch_bits(target):
+    return global_var('etp_arch_bits', target).unsigned
+
+def etp_big_endian(target):
+    return global_var('etp_endianness', target).unsigned > 0
+
+def etp_halfword(target):
+    return False
+
+def the_active_code_index(target):
+    return global_var('the_active_code_index', target)
+
+# Functions
+
+def atom_tab(valobj):
+    idx = valobj.unsigned
+    target = valobj.target
+    seg = erts_atom_table(target).GetChildMemberWithName('seg_table')
+    slot = offset(idx >> 16, seg).deref
+    entry = offset(idx >> 6 & 0x3FF, slot).deref
+    return entry.Cast(Atom(target).GetPointerType())
+
+def erts_lookup_function_info(valobj):
+    r = find_range(valobj)
+    if r is None:
+        return None
+    pc = valobj.unsigned
+    target = valobj.target
+    start = r.GetChildMemberWithName('start').Cast(EtermPtr(target))
+    curr = offset(MI_FUNCTIONS, start).Cast(ErtsCodeInfoPtr(target).GetPointerType())
+    prev = curr
+    cnt = offset(MI_NUM_FUNCTIONS, start).deref.unsigned
+    for x in range(0, cnt):
+        prev = curr
+        curr = offset(1, curr)
+        if pc < curr.deref.unsigned:
+            return prev.deref.GetChildMemberWithName('mfa')
+    return None
+
+def find_range(valobj):
+    pc = valobj.unsigned
+    target = valobj.target
+    active = the_active_code_index(target).unsigned
+    ranges = offset(active, global_var('r', target))
+    n = ranges.GetChildMemberWithName('n').unsigned
+    low = ranges.GetChildMemberWithName('modules')
+    high = offset(n, low)
+    range_type = Range(target)
+    range_pointer_type = range_type.GetPointerType()
+    mid = ranges.GetChildMemberWithName('mid').Cast(range_pointer_type)
+    while low.unsigned < high.unsigned:
+        if pc < mid.GetChildMemberWithName('start').unsigned:
+            high = mid
+        elif pc > mid.GetChildMemberWithName('end').GetChildMemberWithName('counter').unsigned:
+            low = offset(1, mid).Cast(range_pointer_type)
+        else:
+            return mid
+        length = (high.unsigned - low.unsigned) // range_type.size
+        mid = offset(length // 2, low)
+    return None
+
+def mfa(mfa):
+    return '%s:%s/%d' % (eterm(mfa.GetChildMemberWithName('module')),
+                         eterm(mfa.GetChildMemberWithName('function')),
+                         mfa.GetChildMemberWithName('arity').unsigned)
+
+def pixdata2data(valobj):
+    pixdata = valobj.unsigned
+    proc = erts_proc(target)
+    ro = proc.GetChildMemberWithName('r').GetChildMemberWithName('o')
+    pix_mask = ro.GetChildMemberWithName('pix_mask').unsigned
+    pix_cl_mask = ro.GetChildMemberWithName('pix_cl_mask').unsigned
+    pix_cl_shift = ro.GetChildMemberWithName('pix_cl_shift').unsigned
+    pix_cli_mask = ro.GetChildMemberWithName('pix_cli_mask').unsigned
+    pix_cli_shift = ro.GetChildMemberWithName('pix_cli_shift').unsigned
+    data = pixdata & ~pix_mask
+    data |= (pixdata >> pix_cl_shift) & pix_cl_mask
+    data |= (pixdata & pix_cli_mask) << pix_cli_shift
+    return data
+
+# LLDB utils
+
+def global_var(name, target):
+    return target.FindGlobalVariables(name, 1)[0]
+
+def offset(i, valobj):
+    # print("offset(" + str(i) + ", " + str(valobj.unsigned) + ")")
+    val = valobj.GetChildAtIndex(i, lldb.eNoDynamicValues, True)
+    if valobj.TypeIsPointerType():
+        return val.address_of.Cast(valobj.GetType())
+    else:
+        return val
-- 
2.26.2

Places

File 3471-erts-Implement-some-etp-macros-for-lldb.patch of Package erlang (Revision 9cfc7361ef11aa2c9e03afdf25519fb7)

Places