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Merge pull request #2990 from rtfeldman/llvm-wasm-string-literal

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keep strings on the stack on 32-bit targets
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Brian Carroll 2022-05-03 01:56:52 -05:00 • committed by GitHub
commit de7fbc3fb9
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1 changed files with 10 additions and 6 deletions
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16
compiler/gen_llvm/src/llvm/build.rs
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@ -806,20 +806,24 @@ pub fn build_exp_literal<'a, 'ctx, 'env>(
Bool(b) => env.context.bool_type().const_int(*b as u64, false).into(),
Byte(b) => env.context.i8_type().const_int(*b as u64, false).into(),
Str(str_literal) => {
let global = if str_literal.len() < env.small_str_bytes() as usize {
if str_literal.len() < env.small_str_bytes() as usize {
match env.small_str_bytes() {
24 => small_str_ptr_width_8(env, parent, str_literal),
12 => small_str_ptr_width_4(env, parent, str_literal),
24 => small_str_ptr_width_8(env, parent, str_literal).into(),
12 => small_str_ptr_width_4(env, parent, str_literal).into(),
_ => unreachable!("incorrect small_str_bytes"),
}
} else {
let ptr = define_global_str_literal_ptr(env, *str_literal);
let number_of_elements = env.ptr_int().const_int(str_literal.len() as u64, false);
const_str_alloca_ptr(env, parent, ptr, number_of_elements, number_of_elements)
};
let alloca =
const_str_alloca_ptr(env, parent, ptr, number_of_elements, number_of_elements);
global.into()
match env.target_info.ptr_width() {
PtrWidth::Bytes4 => env.builder.build_load(alloca, "load_const_str"),
PtrWidth::Bytes8 => alloca.into(),
}
}
}
}
}