The fields of debug descriptors used internally by LLVM (MachineDebugInfo) +
The fields of debug descriptors used internally by LLVM (MachineModuleInfo) are restricted to only the simple data types int, uint, bool, float, double, sbyte* and { }* . References to arbitrary values are handled using a { }* and a @@ -301,7 +301,7 @@ The remaining fields are specific to the descriptor. The values of tags are loosely bound to the tag values of Dwarf information entries. However, that does not restrict the use of the information supplied to Dwarf targets. To facilitate versioning of debug information, the tag is augmented with the -current debug version (LLVMDebugVersion = 4 << 16 or 0x40000.)
+current debug version (LLVMDebugVersion = 4 << 16 or 0x40000 or 262144.)The details of the various descriptors follow.
@@ -389,6 +389,8 @@ line correspondence. { }*, ;; Global variable anchor = cast (%llvm.dbg.anchor.type* %llvm.dbg.global_variables to { }*), { }*, ;; Reference to context descriptor sbyte*, ;; Name + sbyte*, ;; Display name (fully qualified C++ name) + sbyte*, ;; MIPS linkage name (for C++) { }*, ;; Reference to compile unit where defined uint, ;; Line number where defined { }*, ;; Reference to type descriptor @@ -416,6 +418,8 @@ provide details such as name, type and where the variable is defined. { }*, ;; Subprogram anchor = cast (%llvm.dbg.anchor.type* %llvm.dbg.subprograms to { }*), { }*, ;; Reference to context descriptor sbyte*, ;; Name + sbyte*, ;; Display name (fully qualified C++ name) + sbyte*, ;; MIPS linkage name (for C++) { }*, ;; Reference to compile unit where defined uint, ;; Line number where defined { }*, ;; Reference to type descriptor @@ -590,6 +594,8 @@ are possible tag values; DW_TAG_structure_type = 19 DW_TAG_union_type = 23 DW_TAG_vector_type = 259 + DW_TAG_subroutine_type = 46 + DW_TAG_inheritance = 26The vector flag indicates that an array type is a native packed vector.
@@ -610,6 +616,21 @@ href="#format_basic_type">basic, derived or composite type descriptors, each representing a field member of the structure or union. +For C++ classes (tag = DW_TAG_structure_type), member descriptors +provide information about base classes, static members and member functions. If +a member is a derived type descriptor and has +a tag of DW_TAG_inheritance, then the type represents a base class. If +the member of is a global variable +descriptor then it represents a static member. And, if the member is a subprogram descriptor then it represents a member +function. For static members and member functions, getName() returns +the members link or the C++ mangled name. getDisplayName() the +simplied version of the name.
+ +The first member of subroutine (tag = DW_TAG_subroutine_type) +type elements is the return type for the subroutine. The remaining +elements are the formal arguments to the subroutine.
+Composite type location can be determined from the compile unit and line number. The size, alignment and offset are expressed in bits and can be 64 bit values. The alignment is used to @@ -1123,6 +1144,7 @@ int MyGlobal = 100; { }* cast (%llvm.dbg.anchor.type* %llvm.dbg.global_variables to { }*), { }* cast (%llvm.dbg.compile_unit.type* %llvm.dbg.compile_unit to { }*), sbyte* getelementptr ([9 x sbyte]* %str1, int 0, int 0), + sbyte* getelementptr ([1 x sbyte]* %str2, int 0, int 0), { }* cast (%llvm.dbg.compile_unit.type* %llvm.dbg.compile_unit to { }*), uint 1, { }* cast (%llvm.dbg.basictype.type* %llvm.dbg.basictype to { }*), @@ -1137,7 +1159,7 @@ int MyGlobal = 100; %llvm.dbg.basictype = internal constant %llvm.dbg.basictype.type { uint add(uint 36, uint 262144), { }* cast (%llvm.dbg.compile_unit.type* %llvm.dbg.compile_unit to { }*), - sbyte* getelementptr ([4 x sbyte]* %str2, int 0, int 0), + sbyte* getelementptr ([4 x sbyte]* %str3, int 0, int 0), { }* null, int 0, uint 32, @@ -1149,7 +1171,8 @@ int MyGlobal = 100; ;; Define the names of the global variable and basic type. ;; %str1 = internal constant [9 x sbyte] c"MyGlobal\00", section "llvm.metadata" -%str2 = internal constant [4 x sbyte] c"int\00", section "llvm.metadata" +%str2 = internal constant [1 x sbyte] c"\00", section "llvm.metadata" +%str3 = internal constant [4 x sbyte] c"int\00", section "llvm.metadata" @@ -1196,6 +1219,7 @@ int main(int argc, char *argv[]) { { }* cast (%llvm.dbg.anchor.type* %llvm.dbg.subprograms to { }*), { }* cast (%llvm.dbg.compile_unit.type* %llvm.dbg.compile_unit to { }*), sbyte* getelementptr ([5 x sbyte]* %str1, int 0, int 0), + sbyte* getelementptr ([1 x sbyte]* %str2, int 0, int 0), { }* cast (%llvm.dbg.compile_unit.type* %llvm.dbg.compile_unit to { }*), uint 1, { }* null, @@ -1206,6 +1230,7 @@ int main(int argc, char *argv[]) { ;; Define the name of the subprogram. ;; %str1 = internal constant [5 x sbyte] c"main\00", section "llvm.metadata" +%str2 = internal constant [1 x sbyte] c"\00", section "llvm.metadata" ;; ;; Define the subprogram itself.