1 files changed, 153 insertions, 0 deletions
diff --git a/toolkit/library/build/dependentlibs.py b/toolkit/library/build/dependentlibs.py
new file mode 100644
index 0000000000..d7559844d4
--- /dev/null
+++ b/toolkit/library/build/dependentlibs.py
@@ -0,0 +1,153 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""Given a library, dependentlibs.py prints the list of libraries it depends
+upon that are in the same directory, followed by the library itself.
+"""
+
+import os
+import re
+import subprocess
+import sys
+import mozpack.path as mozpath
+from collections import OrderedDict
+from mozpack.executables import (
+    get_type,
+    ELF,
+    MACHO,
+)
+from buildconfig import substs
+
+
+def dependentlibs_win32_objdump(lib):
+    proc = subprocess.Popen(
+        [substs["LLVM_OBJDUMP"], "--private-headers", lib],
+        stdout=subprocess.PIPE,
+        universal_newlines=True,
+    )
+    deps = []
+    for line in proc.stdout:
+        match = re.match("\s+DLL Name: (\S+)", line)
+        if match:
+            # The DLL Name found might be mixed-case or upper-case. When cross-compiling,
+            # the actual DLLs in dist/bin are all lowercase, whether they are produced
+            # by the build system or copied from WIN32_REDIST_DIR. By turning everything
+            # to lowercase, we ensure we always find the files.
+            # At runtime, when Firefox reads the dependentlibs.list file on Windows, the
+            # case doesn't matter.
+            deps.append(match.group(1).lower())
+    proc.wait()
+    return deps
+
+
+def dependentlibs_readelf(lib):
+    """Returns the list of dependencies declared in the given ELF .so"""
+    proc = subprocess.Popen(
+        [substs.get("READELF", "readelf"), "-d", lib],
+        stdout=subprocess.PIPE,
+        universal_newlines=True,
+    )
+    deps = []
+    for line in proc.stdout:
+        # Each line has the following format:
+        #  tag (TYPE)          value
+        # or with BSD readelf:
+        #  tag TYPE            value
+        # Looking for NEEDED type entries
+        tmp = line.strip().split(" ", 3)
+        if len(tmp) > 3 and "NEEDED" in tmp[1]:
+            # NEEDED lines look like:
+            # 0x00000001 (NEEDED)             Shared library: [libname]
+            # or with BSD readelf:
+            # 0x00000001 NEEDED               Shared library: [libname]
+            match = re.search("\[(.*)\]", tmp[3])
+            if match:
+                deps.append(match.group(1))
+    proc.wait()
+    return deps
+
+
+def dependentlibs_mac_objdump(lib):
+    """Returns the list of dependencies declared in the given MACH-O dylib"""
+    proc = subprocess.Popen(
+        [substs["LLVM_OBJDUMP"], "--private-headers", lib],
+        stdout=subprocess.PIPE,
+        universal_newlines=True,
+    )
+    deps = []
+    cmd = None
+    for line in proc.stdout:
+        # llvm-objdump --private-headers output contains many different
+        # things. The interesting data
+        # is under "Load command n" sections, with the content:
+        #           cmd LC_LOAD_DYLIB
+        #       cmdsize 56
+        #          name libname (offset 24)
+        tmp = line.split()
+        if len(tmp) < 2:
+            continue
+        if tmp[0] == "cmd":
+            cmd = tmp[1]
+        elif cmd == "LC_LOAD_DYLIB" and tmp[0] == "name":
+            deps.append(re.sub("^@executable_path/", "", tmp[1]))
+    proc.wait()
+    return deps
+
+
+def dependentlibs(lib, libpaths, func):
+    """For a given library, returns the list of recursive dependencies that can
+    be found in the given list of paths, followed by the library itself."""
+    assert libpaths
+    assert isinstance(libpaths, list)
+    deps = OrderedDict()
+    for dep in func(lib):
+        if dep in deps or os.path.isabs(dep):
+            continue
+        for dir in libpaths:
+            deppath = os.path.join(dir, dep)
+            if os.path.exists(deppath):
+                deps.update(dependentlibs(deppath, libpaths, func))
+                # Black list the ICU data DLL because preloading it at startup
+                # leads to startup performance problems because of its excessive
+                # size (around 10MB).  Same thing with d3dcompiler_47.dll, but
+                # to a lesser extent, and we were going to dynamically load it
+                # anyway.
+                if not dep.startswith(("icu", "d3dcompiler_47")):
+                    deps[dep] = deppath
+                break
+
+    return deps
+
+
+def gen_list(output, lib):
+    libpaths = [os.path.join(substs["DIST"], "bin")]
+    binary_type = get_type(lib)
+    if binary_type == ELF:
+        func = dependentlibs_readelf
+    elif binary_type == MACHO:
+        func = dependentlibs_mac_objdump
+    else:
+        ext = os.path.splitext(lib)[1]
+        assert ext == ".dll"
+        func = dependentlibs_win32_objdump
+
+    deps = dependentlibs(lib, libpaths, func)
+    base_lib = mozpath.basename(lib)
+    deps[base_lib] = mozpath.join(libpaths[0], base_lib)
+    output.write("\n".join(deps.keys()) + "\n")
+
+    with open(output.name + ".gtest", "w") as gtest_out:
+        libs = list(deps.keys())
+        libs[-1] = "gtest/" + libs[-1]
+        gtest_out.write("\n".join(libs) + "\n")
+
+    return set(deps.values())
+
+
+def main():
+    gen_list(sys.stdout, sys.argv[1])
+
+
+if __name__ == "__main__":
+    main()