[Rust] Unify types between bindings and pure Rust impl

rust/.gitignore

@@ -0,0 +1,4 @@
+target/
+*.rs.bk
+Cargo.lock
+c_runtime_api.rs

rust/common/Cargo.toml

@@ -5,9 +5,11 @@ authors = ["TVM Contributors"]
 license = "Apache-2.0"
 
 [features]
-runtime = []
-frontend = ["tvm-sys"]
+bindings = []
 
 [dependencies]
-error-chain = { version = "0.12.0", default-features = false }
-tvm-sys = { version = "0.1.0", path = "tvm-sys", optional = true }
+failure = "0.1.5"
+ndarray = "0.12.1"
+
+[build-dependencies]
+bindgen = "0.37.4"

rust/common/build.rs

@@ -0,0 +1,31 @@
+extern crate bindgen;
+
+use std::path::PathBuf;
+
+fn main() {
+    if cfg!(feature = "bindings") {
+        println!("cargo:rerun-if-env-changed=TVM_HOME");
+        println!("cargo:rustc-link-lib=dylib=tvm_runtime");
+        println!("cargo:rustc-link-search={}/build", env!("TVM_HOME"));
+    }
+
+    // @see rust-bindgen#550 for `blacklist_type`
+    bindgen::Builder::default()
+        .header(format!(
+            "{}/include/tvm/runtime/c_runtime_api.h",
+            env!("TVM_HOME")
+        ))
+        .header(format!(
+            "{}/include/tvm/runtime/c_backend_api.h",
+            env!("TVM_HOME")
+        ))
+        .clang_arg(format!("-I{}/3rdparty/dlpack/include/", env!("TVM_HOME")))
+        .blacklist_type("max_align_t")
+        .layout_tests(false)
+        .derive_partialeq(true)
+        .derive_eq(true)
+        .generate()
+        .expect("unable to generate bindings")
+        .write_to_file(PathBuf::from("src/c_runtime_api.rs"))
+        .expect("can not write the bindings!");
+}

rust/common/src/array.rs

@@ -0,0 +1,128 @@
+use std::{
+    any::TypeId,
+    mem,
+    os::raw::{c_int, c_void},
+};
+
+use crate::ffi::{
+    DLContext, DLDataType, DLDataTypeCode_kDLFloat, DLDataTypeCode_kDLInt, DLDataTypeCode_kDLUInt,
+    DLDeviceType_kDLCPU, DLTensor,
+};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct DataType {
+    pub code: usize,
+    pub bits: usize,
+    pub lanes: usize,
+}
+
+impl DataType {
+    /// Returns the number of bytes occupied by an element of this `DataType`.
+    pub fn itemsize(&self) -> usize {
+        (self.bits * self.lanes) >> 3
+    }
+
+    /// Returns whether this `DataType` represents primitive type `T`.
+    pub fn is_type<T: 'static>(&self) -> bool {
+        if self.lanes != 1 {
+            return false;
+        }
+        let typ = TypeId::of::<T>();
+        (typ == TypeId::of::<i32>() && self.code == 0 && self.bits == 32)
+            || (typ == TypeId::of::<i64>() && self.code == 0 && self.bits == 64)
+            || (typ == TypeId::of::<u32>() && self.code == 1 && self.bits == 32)
+            || (typ == TypeId::of::<u64>() && self.code == 1 && self.bits == 64)
+            || (typ == TypeId::of::<f32>() && self.code == 2 && self.bits == 32)
+            || (typ == TypeId::of::<f64>() && self.code == 2 && self.bits == 64)
+    }
+
+    pub fn code(&self) -> usize {
+        self.code
+    }
+
+    pub fn bits(&self) -> usize {
+        self.bits
+    }
+
+    pub fn lanes(&self) -> usize {
+        self.lanes
+    }
+}
+
+impl<'a> From<&'a DataType> for DLDataType {
+    fn from(dtype: &'a DataType) -> Self {
+        Self {
+            code: dtype.code as u8,
+            bits: dtype.bits as u8,
+            lanes: dtype.lanes as u16,
+        }
+    }
+}
+
+impl From<DLDataType> for DataType {
+    fn from(dtype: DLDataType) -> Self {
+        Self {
+            code: dtype.code as usize,
+            bits: dtype.bits as usize,
+            lanes: dtype.lanes as usize,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct TVMContext {
+    pub device_type: usize,
+    pub device_id: usize,
+}
+
+impl<'a> From<&'a TVMContext> for DLContext {
+    fn from(ctx: &'a TVMContext) -> Self {
+        Self {
+            device_type: ctx.device_type as u32,
+            device_id: ctx.device_id as i32,
+        }
+    }
+}
+
+impl Default for TVMContext {
+    fn default() -> Self {
+        Self {
+            device_type: DLDeviceType_kDLCPU as usize,
+            device_id: 0,
+        }
+    }
+}
+
+/// `From` conversions to `DLTensor` for `ndarray::Array`.
+/// Takes a reference to the `ndarray` since `DLTensor` is not owned.
+macro_rules! impl_dltensor_from_ndarray {
+    ($type:ty, $typecode:expr) => {
+        impl<'a, D: ndarray::Dimension> From<&'a mut ndarray::Array<$type, D>> for DLTensor {
+            fn from(arr: &'a mut ndarray::Array<$type, D>) -> Self {
+                DLTensor {
+                    data: arr.as_mut_ptr() as *mut c_void,
+                    ctx: DLContext {
+                        device_type: DLDeviceType_kDLCPU,
+                        device_id: 0,
+                    },
+                    ndim: arr.ndim() as c_int,
+                    dtype: DLDataType {
+                        code: $typecode as u8,
+                        bits: 8 * mem::size_of::<$type>() as u8,
+                        lanes: 1,
+                    },
+                    shape: arr.shape().as_ptr() as *const i64 as *mut i64,
+                    strides: arr.strides().as_ptr() as *const isize as *mut i64,
+                    byte_offset: 0,
+                }
+            }
+        }
+    };
+}
+
+impl_dltensor_from_ndarray!(f32, DLDataTypeCode_kDLFloat);
+impl_dltensor_from_ndarray!(f64, DLDataTypeCode_kDLFloat);
+impl_dltensor_from_ndarray!(i32, DLDataTypeCode_kDLInt);
+impl_dltensor_from_ndarray!(i64, DLDataTypeCode_kDLInt);
+impl_dltensor_from_ndarray!(u32, DLDataTypeCode_kDLUInt);
+impl_dltensor_from_ndarray!(u64, DLDataTypeCode_kDLUInt);