tools/devshell/symbolize

#!/bin/bash
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Run, inspect and debug
### symbolize backtraces and program locations provided as input on stdin

## usage: fx symbolize [-i IDS_TXT_FILE] [-r | --remote-symbols]
##
##    -i IDS_TXT_FILE         specify an ids.txt file to be used
##
##    --remote-symbols|-r     attemp to resolve symbols using predefined remote
##                            symbol servers for symbols that cannot be resolved
##                            locally.
##
## Converts sybmolizer markup found in stdin to human readable using
## local symbols (and remote if the --remote-symbols option is used).
## This command is usually used on log output from either zx_log or syslog.
## Anything that is not valid symbolizer markup is left alone. This is similar
## to how c++filt works for demangling C++ symbols.
##
## By default, `fx log` and `fx klog` automatically pipe their results into
## this command.
##
## Authentication:
## If the `--remote-symbols` option is specified, `fx symbolize` will fail if the
## current user is not authenticated with `gcloud` or if they don't have enough
## privileges on the symbol servers. To ensure that the current user is
## properly authenticated, run:
##      `gcloud auth application-default login`

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?

function symbolize {
  fx-config-read
  local symbolize="${HOST_OUT_DIR}/symbolize"
  if [[ ! -x "${symbolize}" ]]; then
    fx-error "Cannot execute '${symbolize}'. Try \`fx build\` first."
    exit 1
  fi
  local llvm_symbolizer="${PREBUILT_CLANG_DIR}/bin/llvm-symbolizer"
  local toolchain_dir="${PREBUILT_CLANG_DIR}/lib/debug/.build-id"
  local prebuilt_build_ids_dir="${FUCHSIA_BUILD_DIR}/gen/build/gn/prebuilt_build_ids"
  local out_dir="${FUCHSIA_BUILD_DIR}/.build-id"
  local zircon_dir="${ZIRCON_BUILDROOT}/.build-id"
  if [[ "${is_remote}" -eq 1 ]]; then
    trap '_code=$?; set +x; exit-with-warning ${_code}' ERR
  fi
  set -x
  "$symbolize" -llvm-symbolizer "$llvm_symbolizer" \
    -ids-rel "${extra_args[@]}" \
    -build-id-dir "$prebuilt_build_ids_dir" -build-id-dir "$toolchain_dir" \
    -build-id-dir "$out_dir" -build-id-dir "$zircon_dir"
}

function exit-with-warning {
  local error_code="$1"
  if [[ "${error_code}" -ne 0 ]]; then
    fx-error "If you are having trouble with authentication, make sure you are" \
             "authenticated in gcloud and you have permission to access" \
             "the remote symbols servers.\nSee \`fx help symbolize\` for more information"
  fi
  exit ${error_code}
}

declare extra_args=()
declare is_remote=0

while [[ $# -ne 0 ]]; do
  case "$1" in
  -h|--help)
    fx-command-help
    exit 0
    ;;
  -i)
    if [[ $# -lt 2 ]]; then
      fx-error Invalid syntax
      fx-command-help
      return 1
    fi
    extra_args+=( "-ids" "$2")
    shift
    ;;
  --remote-symbols|-r)
    is_remote=1
    ;;
  *)
    fx-error Invalid syntax
    fx-command-help
    exit 1
  esac
  shift
done

if [[ "${is_remote}" -eq 1 ]]; then
  extra_args+=(
    "-symbol-cache" "$HOME/.fuchsia-symbol-cache"
    "-symbol-server" "fuchsia-debug-symbols-shortlived"
    "-symbol-server" "fuchsia-debug-symbols-shortlived-internal"
    "-symbol-server" "fuchsia-infra-debug-symbols"
  )
fi

symbolize