I will gladly let Todd run tests on your diff, but I just thought I'd
explain what is going on there
In Cocoa, some NSURL objects are represented as "sub-URLs", e.g. you can
start from www.apple.com and represent www.apple.com/macos as
NSURL(base="www.apple.com", next="/macos")
This can be recursively done, so you can have
NSURL(base=NSURL(base="www.apple.com", next="/macos"), next="/sierra")
The data formatter is attempting to represent the URL as "%s --- %s" %
(summary(base), summary(next))
On 11/14/16 10:00 AM, Zachary Turner via lldb-commits wrote:
zturner created this revision.
zturner added reviewers: tfiala, beanz.
zturner added a subscriber: lldb-commits.
I have locally a a very large patch which removes the method of `StreamString`
that returns a reference to the underlying `std::string` buffer, and instead
returns a `StringRef`. There were 1 or 2 instances where someone was relying
on this function to reach into the underlying buffer and do stuff like insert
or erase from it. This seems like a huge hack, and in the future as I move
code towards `llvm::raw_ostream` this will be incompatible with LLVM's api
anyway since it does not allow such things. The only non-trivial fix to this
was in something Cocoa related. I don't really understand this code, and I
can't test it, but the patch here is intended to be NFC and just re-writing the
logic in terms of something that doesn't modify the internal Stream buffer.
If someone could test it for me I would appreciate.
https://reviews.llvm.org/D26618
Files:
source/Plugins/Language/ObjC/Cocoa.cpp
Index: source/Plugins/Language/ObjC/Cocoa.cpp
===================================================================
--- source/Plugins/Language/ObjC/Cocoa.cpp
+++ source/Plugins/Language/ObjC/Cocoa.cpp
@@ -559,42 +559,44 @@
if (!valobj_addr)
return false;
- const char *class_name = descriptor->GetClassName().GetCString();
+ llvm::StringRef class_name = descriptor->GetClassName().GetStringRef();
- if (!class_name || !*class_name)
+ if (!class_name.equals("NSURL"))
return false;
- if (strcmp(class_name, "NSURL") == 0) {
- uint64_t offset_text = ptr_size + ptr_size +
- 8; // ISA + pointer + 8 bytes of data (even on
32bit)
- uint64_t offset_base = offset_text + ptr_size;
- CompilerType type(valobj.GetCompilerType());
- ValueObjectSP text(
- valobj.GetSyntheticChildAtOffset(offset_text, type, true));
- ValueObjectSP base(
- valobj.GetSyntheticChildAtOffset(offset_base, type, true));
- if (!text)
- return false;
- if (text->GetValueAsUnsigned(0) == 0)
- return false;
- StreamString summary;
- if (!NSStringSummaryProvider(*text, summary, options))
- return false;
- if (base && base->GetValueAsUnsigned(0)) {
- if (summary.GetSize() > 0)
- summary.GetString().resize(summary.GetSize() - 1);
- summary.Printf(" -- ");
- StreamString base_summary;
- if (NSURLSummaryProvider(*base, base_summary, options) &&
- base_summary.GetSize() > 0)
- summary.Printf("%s", base_summary.GetSize() > 2
- ? base_summary.GetData() + 2
- : base_summary.GetData());
- }
- if (summary.GetSize()) {
- stream.Printf("%s", summary.GetData());
- return true;
+ uint64_t offset_text = ptr_size + ptr_size +
+ 8; // ISA + pointer + 8 bytes of data (even on 32bit)
+ uint64_t offset_base = offset_text + ptr_size;
+ CompilerType type(valobj.GetCompilerType());
+ ValueObjectSP text(valobj.GetSyntheticChildAtOffset(offset_text, type,
true));
+ ValueObjectSP base(valobj.GetSyntheticChildAtOffset(offset_base, type,
true));
+ if (!text)
+ return false;
+ if (text->GetValueAsUnsigned(0) == 0)
+ return false;
+ StreamString summary;
+ if (!NSStringSummaryProvider(*text, summary, options))
+ return false;
+ if (base && base->GetValueAsUnsigned(0)) {
+ std::string summary_str = summary.GetString();
+
+ if (!summary_str.empty())
+ summary_str.pop_back();
+ summary_str += " -- ";
+ StreamString base_summary;
+ if (NSURLSummaryProvider(*base, base_summary, options) &&
+ !base_summary.Empty()) {
+ llvm::StringRef base_str = base_summary.GetString();
+ if (base_str.size() > 2)
+ base_str = base_str.drop_front(2);
+ summary_str += base_str;
}
+ summary.Clear();
+ summary.PutCString(summary_str);
+ }
+ if (!summary.Empty()) {
+ stream.PutCString(summary.GetString());
+ return true;
}
return false;
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