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81 lines
3.0 KiB
Plaintext
Executable File
81 lines
3.0 KiB
Plaintext
Executable File
# /bin/bash
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#----------------------------------------------------------------------------
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# We must avoid using the vanilla new/new[] operators (and consequently, the
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# vanilla delete/delete[] operators) in SpiderMonkey, see bug 624878 for why.
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#
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# This script:
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# - Detects if any of the vanilla new/new[] operators are used in a file.
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# Its exit code is 1 if it found some, and 0 if it didn't.
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# - Doesn't detect delete/delete[] because it appears they can be present
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# somehow due to virtual destructors, but this is ok because vanilla
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# delete/delete[] calls don't make sense without corresponding new/new[]
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# calls, and any explicit calls will be caught by Valgrind's mismatched
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# alloc/free checking.
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# - Doesn't detect the 'nothrow' variants, which are ok but probably still
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# best avoided.
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# - Is designed to only run on Linux (though it may also work on Mac); one
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# platform will be enough to catch any violations.
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#
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# If this script fails:
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# - You need to find the uses of vanilla new/delete and replace them with
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# {js::OffTheBooks,JSContext,JSRuntime}::{new_,/array_new}.
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# - Run this script on each of the .o files, that should narrow it down.
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# - After that, one way to find them is to run 'objdump -r -C' on the
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# relevant .o files. For example, you might search for 'operator new' and
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# find a record like this:
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#
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# RELOCATION RECORDS FOR [.text._ZN3JSC14ExecutablePool6createEj]:
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# OFFSET TYPE VALUE
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# 00000009 R_386_PC32 __i686.get_pc_thunk.bx
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# 0000000f R_386_GOTPC _GLOBAL_OFFSET_TABLE_
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# 0000001b R_386_PLT32 operator new(unsigned int)
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# 0000002e R_386_PC32 JSC::ExecutablePool::ExecutablePool(unsigned int)
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# 0000004a R_386_PC32 JSC::ExecutablePool::~ExecutablePool()
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# 00000052 R_386_PLT32 operator delete(void*)
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#
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# This says that vanilla 'new' and 'delete' are both used in
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# JSC::ExecutablePool::create(unsigned int). This doesn't always work,
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# though. (Nb: use 'c++filt' to demangle names like
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# _ZN3JSC14ExecutablePool6createEj.)
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#
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# If that doesn't work, use grep.
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#----------------------------------------------------------------------------
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if [ -z $1 ] ; then
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echo "usage: find_vanilla_new_calls <file>"
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exit 1
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fi
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file=$1
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if [ ! -f $file ] ; then
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echo "TEST-UNEXPECTED-FAIL | find_vanilla_new_calls | file '$file' not found"
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exit 1
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fi
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tmpfile1=`mktemp`
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tmpfile2=`mktemp`
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nm -C $file > $tmpfile1
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# Need to double-escape '[' and ']' to stop grep from interpreting them
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# specially.
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grep '^operator new(unsigned int)' $tmpfile1 >> $tmpfile2
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grep '^operator new(unsigned long)' $tmpfile1 >> $tmpfile2
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grep '^operator new\\[\\](unsigned int)' $tmpfile1 >> $tmpfile2
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grep '^operator new\\[\\](unsigned long)' $tmpfile1 >> $tmpfile2
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rm -f $tmpfile1
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if [ -s $tmpfile2 ] ; then
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echo "TEST-UNEXPECTED-FAIL | find_vanilla_new_calls | found calls are listed below"
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cat $tmpfile2
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echo
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rm -f $tmpfile2
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exit 1
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fi
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echo "TEST-PASS | find_vanilla_new_calls | ok"
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echo
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exit 0
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