stage2: implement `@frameAddress`

1 files changed, 12 insertions, 0 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index e349f0186e..6f2cc9bbd0 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -2214,6 +2214,8 @@ pub const FuncGen = struct {
                 .wrap_errunion_payload => try self.airWrapErrUnionPayload(inst),
                 .wrap_errunion_err     => try self.airWrapErrUnionErr(inst),
 
+                .frame_address => try self.airFrameAddress(inst),
+
                 .constant => unreachable,
                 .const_ty => unreachable,
                 .unreach  => self.airUnreach(inst),
@@ -3339,6 +3341,16 @@ pub const FuncGen = struct {
         return partial;
     }
 
+    fn airFrameAddress(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
+        if (self.liveness.isUnused(inst)) return null;
+
+        const llvm_i32 = try self.dg.llvmType(Type.initTag(.i32));
+        const llvm_fn = self.getIntrinsic("llvm.frameaddress", &.{llvm_i32});
+        const ptr_val = self.builder.buildCall(llvm_fn, &[_]*const llvm.Value{llvm_i32.constNull()}, 1, .Fast, .Auto, "");
+        const llvm_usize = try self.dg.llvmType(Type.usize);
+        return self.builder.buildPtrToInt(ptr_val, llvm_usize, "");
+    }
+
     fn airMin(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
         if (self.liveness.isUnused(inst)) return null;