From 05c5c99a95c894d7e3241e1729e09aa7eacb6035 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Mon, 18 Oct 2021 01:00:07 +0200
Subject: stage2: air ptr_slice_len_ptr and ptr_slice_ptr_ptr

---
 src/codegen/c.zig    | 18 ++++++++++++++++++
 src/codegen/llvm.zig | 13 +++++++++++++
 2 files changed, 31 insertions(+)

(limited to 'src/codegen')

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index ad98dc87c1..1bb337743d 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -1075,6 +1075,9 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
             .slice_ptr        => try airSliceField(f, inst, ".ptr;\n"),
             .slice_len        => try airSliceField(f, inst, ".len;\n"),
 
+            .ptr_slice_len_ptr => try airPtrSliceFieldPtr(f, inst, ".len;\n"),
+            .ptr_slice_ptr_ptr => try airPtrSliceFieldPtr(f, inst, ".ptr;\n"),
+
             .ptr_elem_val       => try airPtrElemVal(f, inst, "["),
             .ptr_ptr_elem_val   => try airPtrElemVal(f, inst, "[0]["),
             .ptr_elem_ptr       => try airPtrElemPtr(f, inst),
@@ -1114,6 +1117,21 @@ fn airSliceField(f: *Function, inst: Air.Inst.Index, suffix: []const u8) !CValue
     return local;
 }
 
+fn airPtrSliceFieldPtr(f: *Function, inst: Air.Inst.Index, suffix: []const u8) !CValue {
+    if (f.liveness.isUnused(inst))
+        return CValue.none;
+
+    const ty_op = f.air.instructions.items(.data)[inst].ty_op;
+    const operand = try f.resolveInst(ty_op.operand);
+    const writer = f.object.writer();
+
+    _ = writer;
+    _ = operand;
+    _ = suffix;
+
+    return f.fail("TODO: C backend: airPtrSliceFieldPtr", .{});
+}
+
 fn airPtrElemVal(f: *Function, inst: Air.Inst.Index, prefix: []const u8) !CValue {
     const is_volatile = false; // TODO
     if (!is_volatile and f.liveness.isUnused(inst))
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 1a8a70c39b..8ec5075f84 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -1709,6 +1709,10 @@ pub const FuncGen = struct {
                 .assembly       => try self.airAssembly(inst),
                 .slice_ptr      => try self.airSliceField(inst, 0),
                 .slice_len      => try self.airSliceField(inst, 1),
+
+                .ptr_slice_ptr_ptr => try self.airPtrSliceFieldPtr(inst, 0),
+                .ptr_slice_len_ptr => try self.airPtrSliceFieldPtr(inst, 1),
+
                 .array_to_slice => try self.airArrayToSlice(inst),
                 .float_to_int   => try self.airFloatToInt(inst),
                 .int_to_float   => try self.airIntToFloat(inst),
@@ -2091,6 +2095,15 @@ pub const FuncGen = struct {
         return self.builder.buildExtractValue(operand, index, "");
     }
 
+    fn airPtrSliceFieldPtr(self: *FuncGen, inst: Air.Inst.Index, index: c_uint) !?*const llvm.Value {
+        if (self.liveness.isUnused(inst)) return null;
+
+        const ty_op = self.air.instructions.items(.data)[inst].ty_op;
+        const slice_ptr = try self.resolveInst(ty_op.operand);
+
+        return self.builder.buildStructGEP(slice_ptr, index, "");
+    }
+
     fn airSliceElemVal(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
         const bin_op = self.air.instructions.items(.data)[inst].bin_op;
         const slice_ty = self.air.typeOf(bin_op.lhs);
-- 
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