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rustc: Write tag variant discriminants into the crate as integer constants

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Patrick Walton 2011-02-28 16:08:05 -08:00
parent a172f5aef5
commit 86309ed3ea
1 changed files with 15 additions and 1 deletions
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16
src/comp/middle/trans.rs
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@ -4609,12 +4609,26 @@ fn trans_constant(&@crate_ctxt cx, @ast.item it) -> @crate_ctxt {
auto n_variants = _vec.len[ast.variant](variants);
while (i < n_variants) {
auto variant = variants.(i);
auto discrim_val = C_int(i as int);
// FIXME: better name.
auto discrim_gvar = llvm.LLVMAddGlobal(cx.llmod, T_int(),
_str.buf("tag_discrim"));
// FIXME: Eventually we do want to export these, but we need
// to figure out what name they get first!
llvm.LLVMSetInitializer(discrim_gvar, discrim_val);
llvm.LLVMSetGlobalConstant(discrim_gvar, True);
llvm.LLVMSetLinkage(discrim_gvar, lib.llvm.LLVMPrivateLinkage
as llvm.Linkage);
if (_vec.len[ast.variant_arg](variant.args) == 0u) {
// Nullary tags become constants. (N-ary tags are treated
// as functions and generated later.)
auto union_val = C_zero_byte_arr(info.size as uint);
auto val = C_struct(vec(C_int(i as int), union_val));
auto val = C_struct(vec(discrim_val, union_val));
// FIXME: better name
auto gvar = llvm.LLVMAddGlobal(cx.llmod, val_ty(val),