test-Root-null.py - mozsearch

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# Test printing roots that refer to NULL pointers.

# Since mozilla.prettyprinters.Pointer declines to create pretty-printers

# for null pointers, GDB built-in printing code ends up handling them. But

# as of 2012-11, GDB suppresses printing pointers in replacement values:

# see: http://sourceware.org/ml/gdb/2012-11/msg00055.html

# Thus, if the pretty-printer for JS::Rooted simply returns the referent as

# a replacement value (which seems reasonable enough, if you want the

# pretty-printer to be completely transparent), and the referent is a null

# pointer, it prints as nothing at all.

# This test ensures that the JS::Rooted pretty-printer doesn't make that

# mistake.

# flake8: noqa: F821

gdb.execute("set print address on")

run_fragment("Root.null")

assert_pretty("null", "0x0")