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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /js/src/gdb/mozilla/ExecutableAllocator.py
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/gdb/mozilla/ExecutableAllocator.py')
-rw-r--r--js/src/gdb/mozilla/ExecutableAllocator.py78
1 files changed, 78 insertions, 0 deletions
diff --git a/js/src/gdb/mozilla/ExecutableAllocator.py b/js/src/gdb/mozilla/ExecutableAllocator.py
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index 000000000..e1ff81240
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+++ b/js/src/gdb/mozilla/ExecutableAllocator.py
@@ -0,0 +1,78 @@
+"""
+All jitted code is allocated via the ExecutableAllocator class. Make GDB aware
+of them, such that we can query for pages which are containing code which are
+allocated by the Jits.
+"""
+
+import gdb
+import mozilla.prettyprinters
+from mozilla.prettyprinters import pretty_printer, ptr_pretty_printer
+
+# Forget any printers from previous loads of this module.
+mozilla.prettyprinters.clear_module_printers(__name__)
+
+# Cache information about the JSString type for this objfile.
+class jsjitExecutableAllocatorCache(object):
+ def __init__(self):
+ self.d = None
+
+ def __getattr__(self, name):
+ if self.d is None:
+ self.initialize()
+ return self.d[name]
+
+ def initialize(self):
+ self.d = {}
+ self.d['ExecutableAllocator'] = gdb.lookup_type('js::jit::ExecutableAllocator')
+ self.d['ExecutablePool'] = gdb.lookup_type('js::jit::ExecutablePool')
+
+@pretty_printer("js::jit::ExecutableAllocator")
+class jsjitExecutableAllocator(object):
+ def __init__(self, value, cache):
+ if not cache.mod_ExecutableAllocator:
+ cache.mod_ExecutableAllocator = jsjitExecutableAllocatorCache()
+ self.value = value
+ self.cache = cache.mod_ExecutableAllocator
+
+ def to_string(self):
+ return "ExecutableAllocator([%s])" % ', '.join([str(x) for x in self])
+
+ def __iter__(self):
+ return self.PoolIterator(self)
+
+ class PoolIterator(object):
+ def __init__(self, allocator):
+ self.allocator = allocator
+ self.entryType = allocator.cache.ExecutablePool.pointer()
+ # Emulate the HashSet::Range
+ self.table = allocator.value['m_pools']['impl']['table']
+ self.index = 0;
+ HASHNUMBER_BIT_SIZE = 32
+ self.max = 1 << (HASHNUMBER_BIT_SIZE - allocator.value['m_pools']['impl']['hashShift'])
+ if self.table == 0:
+ self.max = 0
+
+ def __iter__(self):
+ return self;
+
+ def next(self):
+ cur = self.index
+ if cur >= self.max:
+ raise StopIteration()
+ self.index = self.index + 1
+ if self.table[cur]['keyHash'] > 1: # table[i]->isLive()
+ return self.table[cur]['mem']['u']['mDummy'].cast(self.entryType)
+ return self.next()
+
+@ptr_pretty_printer("js::jit::ExecutablePool")
+class jsjitExecutablePool(mozilla.prettyprinters.Pointer):
+ def __init__(self, value, cache):
+ if not cache.mod_ExecutableAllocator:
+ cache.mod_ExecutableAllocator = jsjitExecutableAllocatorCache()
+ self.value = value
+ self.cache = cache.mod_ExecutableAllocator
+
+ def to_string(self):
+ pages = self.value['m_allocation']['pages']
+ size = self.value['m_allocation']['size']
+ return "ExecutablePool %08x-%08x" % (pages, pages + size)