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Add -Z llvm_module_flag

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Allow adding values to the `!llvm.module.flags` metadata for a generated
module.  The syntax is

`-Z llvm_module_flag=<name>:<type>:<value>:<behavior>`

Currently only u32 values are supported but the type is required to be
specified for forward compatibility.  The `behavior` element must match
one of the named LLVM metadata behaviors.viors.

This flag is expected to be perma-unstable.
This commit is contained in:
Paul Menage 2023-10-09 02:22:14 -07:00
parent 2c1b65ee14
commit 2e6b57541d
5 changed files with 68 additions and 0 deletions
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18
compiler/rustc_codegen_llvm/src/context.rs
View file

@ -368,6 +368,24 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMMDNodeInContext(llcx, &name_metadata, 1),
);
// Add module flags specified via -Z llvm_module_flag
for (key, value, behavior) in &sess.opts.unstable_opts.llvm_module_flag {
let key = format!("{key}\0");
let behavior = match behavior.as_str() {
"error" => llvm::LLVMModFlagBehavior::Error,
"warning" => llvm::LLVMModFlagBehavior::Warning,
"require" => llvm::LLVMModFlagBehavior::Require,
"override" => llvm::LLVMModFlagBehavior::Override,
"append" => llvm::LLVMModFlagBehavior::Append,
"appendunique" => llvm::LLVMModFlagBehavior::AppendUnique,
"max" => llvm::LLVMModFlagBehavior::Max,
"min" => llvm::LLVMModFlagBehavior::Min,
// We already checked this during option parsing
_ => unreachable!(),
};
llvm::LLVMRustAddModuleFlag(llmod, behavior, key.as_ptr().cast(), *value)
}
llmod
}