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Fix leak. Only create one NamedMDNode for each name.

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This commit is contained in:
Nick Lewycky
2019-11-01 17:49:45 -07:00
parent bc521a2837
commit 132757ee9d
1 changed files with 32 additions and 17 deletions
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49
lib/llvm-backend/src/intrinsics.rs
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@ -1198,8 +1198,13 @@ pub fn tbaa_label(
let context = module.get_context();
// `!wasmer_tbaa_root = {}`, the TBAA root node for wasmer.
module.add_global_metadata("wasmer_tbaa_root", &MetadataValue::create_node(&[]));
let tbaa_root = module.get_global_metadata("wasmer_tbaa_root")[0];
let tbaa_root = module
.get_global_metadata("wasmer_tbaa_root")
.pop()
.unwrap_or_else(|| {
module.add_global_metadata("wasmer_tbaa_root", &MetadataValue::create_node(&[]));
module.get_global_metadata("wasmer_tbaa_root")[0]
});
// Construct (or look up) the type descriptor, for example
// `!"local 0" = !{!"local 0", !wasmer_tbaa_root}`.
@ -1209,28 +1214,38 @@ pub fn tbaa_label(
label.to_string()
};
let type_label = context.metadata_string(label.as_str());
module.add_global_metadata(
label.as_str(),
&MetadataValue::create_node(&[type_label.into(), tbaa_root.into()]),
);
let type_tbaa = module.get_global_metadata(label.as_str())[0];
let type_tbaa = module
.get_global_metadata(label.as_str())
.pop()
.unwrap_or_else(|| {
module.add_global_metadata(
label.as_str(),
&MetadataValue::create_node(&[type_label.into(), tbaa_root.into()]),
);
module.get_global_metadata(label.as_str())[0]
});
// Construct (or look up) the access tag, which is a struct of the form
// (base type, acess type, offset).
// (base type, access type, offset).
//
// "If BaseTy is a scalar type, Offset must be 0 and BaseTy and AccessTy
// must be the same".
// -- https://llvm.org/docs/LangRef.html#tbaa-metadata
let label = label + "_memop";
module.add_global_metadata(
label.as_str(),
&MetadataValue::create_node(&[
type_tbaa.into(),
type_tbaa.into(),
intrinsics.i64_zero.into(),
]),
);
let type_tbaa = module.get_global_metadata(label.as_str())[0];
let type_tbaa = module
.get_global_metadata(label.as_str())
.pop()
.unwrap_or_else(|| {
module.add_global_metadata(
label.as_str(),
&MetadataValue::create_node(&[
type_tbaa.into(),
type_tbaa.into(),
intrinsics.i64_zero.into(),
]),
);
module.get_global_metadata(label.as_str())[0]
});
// Attach the access tag to the instruction.
let tbaa_kind = context.get_kind_id("tbaa");