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Write name and value for each env var

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This commit is contained in:
Christian Poveda 2019-08-26 15:18:11 -05:00
parent 631d5facba
commit ace3416cf2
1 changed files with 9 additions and 7 deletions
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16
src/shims/env.rs
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@ -16,17 +16,19 @@ impl EnvVars {
) {
if ecx.machine.communicate {
for (name, value) in std::env::vars() {
let value = alloc_env_value(value.as_bytes(), ecx.memory_mut());
ecx.machine.env_vars.map.insert(name.into_bytes(), value);
let var_ptr = alloc_env_var(name.as_bytes(), value.as_bytes(), ecx.memory_mut());
ecx.machine.env_vars.map.insert(name.into_bytes(), var_ptr);
}
}
}
}
fn alloc_env_value<'mir, 'tcx>(
bytes: &[u8],
fn alloc_env_var<'mir, 'tcx>(
name: &[u8],
value: &[u8],
memory: &mut Memory<'mir, 'tcx, Evaluator<'tcx>>,
) -> Pointer<Tag> {
let bytes = [name, b"=", value].concat();
let tcx = {memory.tcx.tcx};
let length = bytes.len() as u64;
// `+1` for the null terminator.
@ -57,7 +59,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
let name_ptr = this.read_scalar(name_op)?.not_undef()?;
let name = this.memory().read_c_str(name_ptr)?;
Ok(match this.machine.env_vars.map.get(name) {
Some(&var) => Scalar::Ptr(var),
Some(var_ptr) => Scalar::Ptr(var_ptr.offset(Size::from_bytes(name.len() as u64 + 1), this)?),
None => Scalar::ptr_null(&*this.tcx),
})
}
@ -80,8 +82,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
}
}
if let Some((name, value)) = new {
let value_copy = alloc_env_value(&value, this.memory_mut());
if let Some(var) = this.machine.env_vars.map.insert(name.to_owned(), value_copy) {
let var_ptr = alloc_env_var(&name, &value, this.memory_mut());
if let Some(var) = this.machine.env_vars.map.insert(name.to_owned(), var_ptr) {
this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
}
Ok(0)