if (K == MachO)
Size = alignTo(Size, 4); // Pad to multiple of 4.
+
+ // The first byte in an ELF string table must be null, according to the ELF
+ // specification. In 'initSize()' we reserved the first byte to hold null for
+ // this purpose and here we actually add the string to allow 'getOffset()' to
+ // be called on an empty string.
+ if (K == ELF)
+ StringIndexMap[CachedHashStringRef("")] = 0;
}
void StringTableBuilder::clear() {
--- /dev/null
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy %t %t2
+# RUN: llvm-readobj -t %t2 | FileCheck %s
+
+## Check that all values of the null symbol are zeroes.
+
+# CHECK: Symbols [
+# CHECK-NEXT: Symbol {
+# CHECK-NEXT: Name: (0)
+# CHECK-NEXT: Value: 0x0
+# CHECK-NEXT: Size: 0
+# CHECK-NEXT: Binding: Local (0x0)
+# CHECK-NEXT: Type: None (0x0)
+# CHECK-NEXT: Other: 0
+# CHECK-NEXT: Section: Undefined (0x0)
+# CHECK-NEXT: }
+
+## Check we emit a zero in st_name field when a symbol has no name.
+
+# CHECK: Name: .text (0)
+# CHECK-NEXT: Value: 0x0
+# CHECK-NEXT: Size: 0
+# CHECK-NEXT: Binding: Local (0x0)
+# CHECK-NEXT: Type: Section (0x3)
+# CHECK-NEXT: Other: 0
+# CHECK-NEXT: Section: .text (0x1)
+# CHECK-NEXT: }
+
+!ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_EXEC
+ Machine: EM_X86_64
+Sections:
+ - Name: .text
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
+Symbols:
+ Local:
+ - Name: ""
+ Type: STT_SECTION
+ Section: .text
+ Global:
+ # We need to have a named symbol, otherwise the original
+ # issue that was fixed is not reproduced by this test.
+ - Name: foo