[ObjC] Add dataformatter for NSDecimalNumber
This patch adds a data formatter for NSDecimalNumber. The latter is a
Foundation object used for representing and performing arithmetic on
base-10 numbers that bridges to Decimal.
Differential revision: https://reviews.llvm.org/D48114
llvm-svn: 334638
diff --git a/lldb/source/Plugins/Language/ObjC/Cocoa.cpp b/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
index c185b81..8f278fc 100644
--- a/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
+++ b/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
@@ -458,6 +458,9 @@
if (class_name == "__NSCFBoolean")
return ObjCBooleanSummaryProvider(valobj, stream, options);
+ if (class_name == "NSDecimalNumber")
+ return NSDecimalNumberSummaryProvider(valobj, stream, options);
+
if (class_name == "NSNumber" || class_name == "__NSCFNumber") {
uint64_t value = 0;
uint64_t i_bits = 0;
@@ -625,6 +628,55 @@
return false;
}
+bool lldb_private::formatters::NSDecimalNumberSummaryProvider(
+ ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+ ProcessSP process_sp = valobj.GetProcessSP();
+ if (!process_sp)
+ return false;
+
+ lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+ uint32_t ptr_size = process_sp->GetAddressByteSize();
+
+ Status error;
+ int8_t exponent = process_sp->ReadUnsignedIntegerFromMemory(
+ valobj_addr + ptr_size, 1, 0, error);
+ if (error.Fail())
+ return false;
+
+ uint8_t length_and_negative = process_sp->ReadUnsignedIntegerFromMemory(
+ valobj_addr + ptr_size + 1, 1, 0, error);
+ if (error.Fail())
+ return false;
+
+ // Fifth bit marks negativity.
+ const bool is_negative = (length_and_negative >> 4) & 1;
+
+ // Zero length and negative means NaN.
+ uint8_t length = length_and_negative & 0xf;
+ const bool is_nan = is_negative && (length == 0);
+
+ if (is_nan) {
+ stream.Printf("NaN");
+ return true;
+ }
+
+ if (length == 0) {
+ stream.Printf("0");
+ return true;
+ }
+
+ uint64_t mantissa = process_sp->ReadUnsignedIntegerFromMemory(
+ valobj_addr + ptr_size + 4, 8, 0, error);
+ if (error.Fail())
+ return false;
+
+ if (is_negative)
+ stream.Printf("-");
+
+ stream.Printf("%" PRIu64 " x 10^%" PRIi8, mantissa, exponent);
+ return true;
+}
+
bool lldb_private::formatters::NSURLSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
ProcessSP process_sp = valobj.GetProcessSP();