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Implement MCOPY (#18)

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Signed-off-by: xermicus <cyrill@parity.io>
This commit is contained in:
Cyrill Leutwiler
2024-05-29 21:43:22 +02:00
committed by GitHub
parent 2ea10d0c3e
commit 532721f3be
11 changed files with 81 additions and 122 deletions
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crates/llvm-context/src/polkavm/context/mod.rs
+23 -51
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@@ -1060,63 +1060,35 @@ where
/// Sets the alignment to `1`, since all non-stack memory pages have such alignment.
pub fn build_memcpy(
&self,
_function: FunctionDeclaration<'ctx>,
destination: Pointer<'ctx>,
source: Pointer<'ctx>,
size: inkwell::values::IntValue<'ctx>,
_name: &str,
) -> anyhow::Result<()> {
let _ = self
.builder()
.build_memcpy(destination.value, 1, source.value, 1, size)?;
Ok(())
}
/// Builds a memory copy call for the return data.
/// Sets the output length to `min(output_length, return_data_size` and calls the default
/// generic page memory copy builder.
pub fn build_memcpy_return_data(
&self,
function: FunctionDeclaration<'ctx>,
destination: Pointer<'ctx>,
source: Pointer<'ctx>,
size: inkwell::values::IntValue<'ctx>,
name: &str,
) -> anyhow::Result<()> {
let pointer_casted = self.builder.build_ptr_to_int(
source.value,
self.word_type(),
format!("{name}_pointer_casted").as_str(),
)?;
let return_data_size_shifted = self.builder.build_right_shift(
pointer_casted,
self.word_const((revive_common::BIT_LENGTH_X32 * 3) as u64),
false,
format!("{name}_return_data_size_shifted").as_str(),
)?;
let return_data_size_truncated = self.builder.build_and(
return_data_size_shifted,
self.word_const(u32::MAX as u64),
format!("{name}_return_data_size_truncated").as_str(),
)?;
let is_return_data_size_lesser = self.builder.build_int_compare(
inkwell::IntPredicate::ULT,
return_data_size_truncated,
size,
format!("{name}_is_return_data_size_lesser").as_str(),
)?;
let min_size = self
.builder
.build_select(
is_return_data_size_lesser,
return_data_size_truncated,
size,
format!("{name}_min_size").as_str(),
)?
.into_int_value();
let size = self.safe_truncate_int_to_xlen(size)?;
self.build_memcpy(function, destination, source, min_size, name)?;
let destination = if destination.address_space == AddressSpace::Heap {
self.build_heap_gep(
self.builder()
.build_ptr_to_int(destination.value, self.xlen_type(), name)?,
size,
)?
} else {
destination
};
let source = if source.address_space == AddressSpace::Heap {
self.build_heap_gep(
self.builder()
.build_ptr_to_int(source.value, self.xlen_type(), name)?,
size,
)?
} else {
source
};
self.builder()
.build_memmove(destination.value, 1, source.value, 1, size)?;
Ok(())
}