wasm-linker: Implement symbol names emitting

The linker will now emit names for all function, global and data segment symbols.
This increases the ability to debug wasm modules tremendously as tools like wasm2wat
can use this information to generate named functions, globals etc, rather than placeholders such as $f1.

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/std/wasm.zig b/lib/std/wasm.zig
index f96c1bc1b9..681ac405fc 100644
--- a/lib/std/wasm.zig
+++ b/lib/std/wasm.zig
@@ -406,6 +406,22 @@ pub fn externalKind(val: ExternalKind) u8 {
     return @enumToInt(val);
 }
 
+/// Defines the enum values for each subsection id for the "Names" custom section
+/// as described by:
+/// https://webassembly.github.io/spec/core/appendix/custom.html?highlight=name#name-section
+pub const NameSubsection = enum(u8) {
+    module,
+    function,
+    local,
+    label,
+    type,
+    table,
+    memory,
+    global,
+    elem_segment,
+    data_segment,
+};
+
 // type constants
 pub const element_type: u8 = 0x70;
 pub const function_type: u8 = 0x60;