std.dwarf: implement basic DWARF 5 parsing

DWARF 5 moves around some fields and adds a few new ones that can't be
parsed or ignored by our current DWARF 4 parser. This isn't a complete
implementation of DWARF 5, but this is enough to make stack traces
mostly work. Line numbers from C++ don't show up, but I know the info
is there. I think the answer is to iterate through .debug_line_str in
getLineNumberInfo, but I didn't want to fall into an even deeper rabbit
hole tonight.

1 files changed, 46 insertions, 0 deletions

diff --git a/lib/std/dwarf/ATE.zig b/lib/std/dwarf/ATE.zig
new file mode 100644
index 0000000000..3e5d192e6e
--- /dev/null
+++ b/lib/std/dwarf/ATE.zig
@@ -0,0 +1,46 @@
+pub const @"void" = 0x0;
+pub const address = 0x1;
+pub const boolean = 0x2;
+pub const complex_float = 0x3;
+pub const float = 0x4;
+pub const signed = 0x5;
+pub const signed_char = 0x6;
+pub const unsigned = 0x7;
+pub const unsigned_char = 0x8;
+
+// DWARF 3.
+pub const imaginary_float = 0x9;
+pub const packed_decimal = 0xa;
+pub const numeric_string = 0xb;
+pub const edited = 0xc;
+pub const signed_fixed = 0xd;
+pub const unsigned_fixed = 0xe;
+pub const decimal_float = 0xf;
+
+// DWARF 4.
+pub const UTF = 0x10;
+
+// DWARF 5.
+pub const UCS = 0x11;
+pub const ASCII = 0x12;
+
+pub const lo_user = 0x80;
+pub const hi_user = 0xff;
+
+// HP extensions.
+pub const HP_float80 = 0x80; // Floating-point (80 bit).
+pub const HP_complex_float80 = 0x81; // Complex floating-point (80 bit).
+pub const HP_float128 = 0x82; // Floating-point (128 bit).
+pub const HP_complex_float128 = 0x83; // Complex fp (128 bit).
+pub const HP_floathpintel = 0x84; // Floating-point (82 bit IA64).
+pub const HP_imaginary_float80 = 0x85;
+pub const HP_imaginary_float128 = 0x86;
+pub const HP_VAX_float = 0x88; // F or G floating.
+pub const HP_VAX_float_d = 0x89; // D floating.
+pub const HP_packed_decimal = 0x8a; // Cobol.
+pub const HP_zoned_decimal = 0x8b; // Cobol.
+pub const HP_edited = 0x8c; // Cobol.
+pub const HP_signed_fixed = 0x8d; // Cobol.
+pub const HP_unsigned_fixed = 0x8e; // Cobol.
+pub const HP_VAX_complex_float = 0x8f; // F or G floating complex.
+pub const HP_VAX_complex_float_d = 0x90; // D floating complex.