compiler: change canonical path for backend ABI source files

3 files changed, 173 insertions, 2 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 1645a92657..27092a1de8 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -21,11 +21,11 @@ const Air = @import("../Air.zig");
 const Value = @import("../Value.zig");
 const Type = @import("../Type.zig");
 const x86_64_abi = @import("../arch/x86_64/abi.zig");
-const wasm_c_abi = @import("../arch/wasm/abi.zig");
+const wasm_c_abi = @import("wasm/abi.zig");
 const aarch64_c_abi = @import("aarch64/abi.zig");
 const arm_c_abi = @import("arm/abi.zig");
 const riscv_c_abi = @import("../arch/riscv64/abi.zig");
-const mips_c_abi = @import("../arch/mips/abi.zig");
+const mips_c_abi = @import("mips/abi.zig");
 const dev = @import("../dev.zig");
 
 const target_util = @import("../target.zig");
diff --git a/src/codegen/mips/abi.zig b/src/codegen/mips/abi.zig
new file mode 100644
index 0000000000..02c4c637a4
--- /dev/null
+++ b/src/codegen/mips/abi.zig
@@ -0,0 +1,84 @@
+const std = @import("std");
+const Type = @import("../../Type.zig");
+const Zcu = @import("../../Zcu.zig");
+const assert = std.debug.assert;
+
+pub const Class = union(enum) {
+    memory,
+    byval,
+    i32_array: u8,
+};
+
+pub const Context = enum { ret, arg };
+
+pub fn classifyType(ty: Type, zcu: *Zcu, ctx: Context) Class {
+    const target = zcu.getTarget();
+    std.debug.assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
+
+    const max_direct_size = target.ptrBitWidth() * 2;
+    switch (ty.zigTypeTag(zcu)) {
+        .@"struct" => {
+            const bit_size = ty.bitSize(zcu);
+            if (ty.containerLayout(zcu) == .@"packed") {
+                if (bit_size > max_direct_size) return .memory;
+                return .byval;
+            }
+            if (bit_size > max_direct_size) return .memory;
+            // TODO: for bit_size <= 32 using byval is more correct, but that needs inreg argument attribute
+            const count = @as(u8, @intCast(std.mem.alignForward(u64, bit_size, 32) / 32));
+            return .{ .i32_array = count };
+        },
+        .@"union" => {
+            const bit_size = ty.bitSize(zcu);
+            if (ty.containerLayout(zcu) == .@"packed") {
+                if (bit_size > max_direct_size) return .memory;
+                return .byval;
+            }
+            if (bit_size > max_direct_size) return .memory;
+
+            return .byval;
+        },
+        .bool => return .byval,
+        .float => return .byval,
+        .int, .@"enum", .error_set => {
+            return .byval;
+        },
+        .vector => {
+            const elem_type = ty.elemType2(zcu);
+            switch (elem_type.zigTypeTag(zcu)) {
+                .bool, .int => {
+                    const bit_size = ty.bitSize(zcu);
+                    if (ctx == .ret and bit_size > 128) return .memory;
+                    if (bit_size > 512) return .memory;
+                    // TODO: byval vector arguments with non power of 2 size need inreg attribute
+                    return .byval;
+                },
+                .float => return .memory,
+                else => unreachable,
+            }
+        },
+        .optional => {
+            std.debug.assert(ty.isPtrLikeOptional(zcu));
+            return .byval;
+        },
+        .pointer => {
+            std.debug.assert(!ty.isSlice(zcu));
+            return .byval;
+        },
+        .error_union,
+        .frame,
+        .@"anyframe",
+        .noreturn,
+        .void,
+        .type,
+        .comptime_float,
+        .comptime_int,
+        .undefined,
+        .null,
+        .@"fn",
+        .@"opaque",
+        .enum_literal,
+        .array,
+        => unreachable,
+    }
+}
diff --git a/src/codegen/wasm/abi.zig b/src/codegen/wasm/abi.zig
new file mode 100644
index 0000000000..a1fa812649
--- /dev/null
+++ b/src/codegen/wasm/abi.zig
@@ -0,0 +1,87 @@
+//! Classifies Zig types to follow the C-ABI for Wasm.
+//! The convention for Wasm's C-ABI can be found at the tool-conventions repo:
+//! https://github.com/WebAssembly/tool-conventions/blob/main/BasicCABI.md
+//! When not targeting the C-ABI, Zig is allowed to do derail from this convention.
+//! Note: Above mentioned document is not an official specification, therefore called a convention.
+
+const std = @import("std");
+const Target = std.Target;
+const assert = std.debug.assert;
+
+const Type = @import("../../Type.zig");
+const Zcu = @import("../../Zcu.zig");
+
+/// Defines how to pass a type as part of a function signature,
+/// both for parameters as well as return values.
+pub const Class = union(enum) {
+    direct: Type,
+    indirect,
+};
+
+/// Classifies a given Zig type to determine how they must be passed
+/// or returned as value within a wasm function.
+pub fn classifyType(ty: Type, zcu: *const Zcu) Class {
+    const ip = &zcu.intern_pool;
+    assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
+    switch (ty.zigTypeTag(zcu)) {
+        .int, .@"enum", .error_set => return .{ .direct = ty },
+        .float => return .{ .direct = ty },
+        .bool => return .{ .direct = ty },
+        .vector => return .{ .direct = ty },
+        .array => return .indirect,
+        .optional => {
+            assert(ty.isPtrLikeOptional(zcu));
+            return .{ .direct = ty };
+        },
+        .pointer => {
+            assert(!ty.isSlice(zcu));
+            return .{ .direct = ty };
+        },
+        .@"struct" => {
+            const struct_type = zcu.typeToStruct(ty).?;
+            if (struct_type.layout == .@"packed") {
+                return .{ .direct = ty };
+            }
+            if (struct_type.field_types.len > 1) {
+                // The struct type is non-scalar.
+                return .indirect;
+            }
+            const field_ty = Type.fromInterned(struct_type.field_types.get(ip)[0]);
+            const explicit_align = struct_type.fieldAlign(ip, 0);
+            if (explicit_align != .none) {
+                if (explicit_align.compareStrict(.gt, field_ty.abiAlignment(zcu)))
+                    return .indirect;
+            }
+            return classifyType(field_ty, zcu);
+        },
+        .@"union" => {
+            const union_obj = zcu.typeToUnion(ty).?;
+            if (union_obj.flagsUnordered(ip).layout == .@"packed") {
+                return .{ .direct = ty };
+            }
+            const layout = ty.unionGetLayout(zcu);
+            assert(layout.tag_size == 0);
+            if (union_obj.field_types.len > 1) return .indirect;
+            const first_field_ty = Type.fromInterned(union_obj.field_types.get(ip)[0]);
+            return classifyType(first_field_ty, zcu);
+        },
+        .error_union,
+        .frame,
+        .@"anyframe",
+        .noreturn,
+        .void,
+        .type,
+        .comptime_float,
+        .comptime_int,
+        .undefined,
+        .null,
+        .@"fn",
+        .@"opaque",
+        .enum_literal,
+        => unreachable,
+    }
+}
+
+pub fn lowerAsDoubleI64(scalar_ty: Type, zcu: *const Zcu) bool {
+    return scalar_ty.bitSize(zcu) > 64;
+}