moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/codegen/src/ir/heap.rs

@@ -0,0 +1,62 @@
+//! Heaps.
+
+use crate::ir::immediates::Uimm64;
+use crate::ir::{GlobalValue, Type};
+use core::fmt;
+
+/// Information about a heap declaration.
+#[derive(Clone)]
+pub struct HeapData {
+    /// The address of the start of the heap's storage.
+    pub base: GlobalValue,
+
+    /// Guaranteed minimum heap size in bytes. Heap accesses before `min_size` don't need bounds
+    /// checking.
+    pub min_size: Uimm64,
+
+    /// Size in bytes of the offset-guard pages following the heap.
+    pub offset_guard_size: Uimm64,
+
+    /// Heap style, with additional style-specific info.
+    pub style: HeapStyle,
+
+    /// The index type for the heap.
+    pub index_type: Type,
+}
+
+/// Style of heap including style-specific information.
+#[derive(Clone)]
+pub enum HeapStyle {
+    /// A dynamic heap can be relocated to a different base address when it is grown.
+    Dynamic {
+        /// Global value providing the current bound of the heap in bytes.
+        bound_gv: GlobalValue,
+    },
+
+    /// A static heap has a fixed base address and a number of not-yet-allocated pages before the
+    /// offset-guard pages.
+    Static {
+        /// Heap bound in bytes. The offset-guard pages are allocated after the bound.
+        bound: Uimm64,
+    },
+}
+
+impl fmt::Display for HeapData {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(match self.style {
+            HeapStyle::Dynamic { .. } => "dynamic",
+            HeapStyle::Static { .. } => "static",
+        })?;
+
+        write!(f, " {}, min {}", self.base, self.min_size)?;
+        match self.style {
+            HeapStyle::Dynamic { bound_gv } => write!(f, ", bound {}", bound_gv)?,
+            HeapStyle::Static { bound } => write!(f, ", bound {}", bound)?,
+        }
+        write!(
+            f,
+            ", offset_guard {}, index_type {}",
+            self.offset_guard_size, self.index_type
+        )
+    }
+}