Author: jmolenda
Date: Thu May 2 16:14:26 2019
New Revision: 359843
URL: http://llvm.org/viewvc/llvm-project?rev=359843&view=rev
Log:
Upstreaming an apple local patch by Frederic Riss.
lldb has an expression that runs in the inferior process to collect
the isa values and hash of the class names for classes in the
system's shared cache. In recent OSes, swift classes are in this
table and the function the jitted expression calls returns demangled
names. We need to compute the hashes based on the mangled names.
So for these names, return a hash value of 0 which indicates that
lldb should read the class name directly out of the runtime tables
and compute the hash itself.
When this patch is absent, the lldb+swift testsuite has many failures
on a recent macOS system; there isn't a direct non-swift way to
test for this being correct.
<rdar://problem/47935062>
Modified:
lldb/trunk/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
Modified:
lldb/trunk/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
URL:
http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp?rev=359843&r1=359842&r2=359843&view=diff
==============================================================================
---
lldb/trunk/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
(original)
+++
lldb/trunk/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
Thu May 2 16:14:26 2019
@@ -289,7 +289,18 @@ __lldb_apple_objc_v2_get_shared_cache_cl
const char *s = name;
uint32_t h = 5381;
for (unsigned char c = *s; c; c = *++s)
+ {
+ // class_getName demangles swift names and the hash
must
+ // be calculated on the mangled name. hash==0 means
lldb
+ // will fetch the mangled name and compute the hash in
+ // ParseClassInfoArray.
+ if (c == '.')
+ {
+ h = 0;
+ break;
+ }
h = ((h << 5) + h) + c;
+ }
class_infos[idx].hash = h;
}
else
@@ -321,7 +332,18 @@ __lldb_apple_objc_v2_get_shared_cache_cl
const char *s = name;
uint32_t h = 5381;
for (unsigned char c = *s; c; c = *++s)
+ {
+ // class_getName demangles swift names and the hash
must
+ // be calculated on the mangled name. hash==0 means
lldb
+ // will fetch the mangled name and compute the hash in
+ // ParseClassInfoArray.
+ if (c == '.')
+ {
+ h = 0;
+ break;
+ }
h = ((h << 5) + h) + c;
+ }
class_infos[idx].hash = h;
}
++idx;
@@ -1488,7 +1510,16 @@ uint32_t AppleObjCRuntimeV2::ParseClassI
// Read the 32 bit hash for the class name
const uint32_t name_hash = data.GetU32(&offset);
ClassDescriptorSP descriptor_sp(new ClassDescriptorV2(*this, isa, NULL));
- AddClass(isa, descriptor_sp, name_hash);
+
+ // The code in g_get_shared_cache_class_info_body sets the value of the
hash
+ // to 0 to signal a demangled symbol. We use class_getName() in that
code to
+ // find the class name, but this returns a demangled name for Swift
symbols.
+ // For those symbols, recompute the hash here by reading their name from
the
+ // runtime.
+ if (name_hash)
+ AddClass(isa, descriptor_sp, name_hash);
+ else
+ AddClass(isa, descriptor_sp,
descriptor_sp->GetClassName().AsCString(nullptr));
num_parsed++;
if (should_log)
log->Printf("AppleObjCRuntimeV2 added isa=0x%" PRIx64
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