zig

commit 80427796df5f8eb23ac7ca8ee03ac572b737757f (tree)
parent 53ec2a955eb02dc829af8610f17af42717d512fb
Author: Jacob Young <jacobly0@users.noreply.github.com>
Date:   Sat, 18 Mar 2023 23:10:44 -0400

x86_64: implement @returnAddress and @frameAddress

Diffstat:
M
src/arch/x86_64/CodeGen.zig
 | 
11
+++++++++--
M
test/behavior/return_address.zig
 | 
1
-

2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/src/arch/x86_64/CodeGen.zig b/src/arch/x86_64/CodeGen.zig
@@ -4119,12 +4119,19 @@ fn airBreakpoint(self: *Self) !void {
 }
 
 fn airRetAddr(self: *Self, inst: Air.Inst.Index) !void {
-    const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement airRetAddr for x86_64", .{});
+    const result: MCValue = if (self.liveness.isUnused(inst))
+        .dead
+    else
+        .{ .stack_offset = -@as(i32, @divExact(self.target.cpu.arch.ptrBitWidth(), 8)) };
     return self.finishAir(inst, result, .{ .none, .none, .none });
 }
 
 fn airFrameAddress(self: *Self, inst: Air.Inst.Index) !void {
-    const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement airFrameAddress for x86_64", .{});
+    const result = if (self.liveness.isUnused(inst)) .dead else result: {
+        const dst_mcv = try self.allocRegOrMem(inst, true);
+        try self.genBinOpMir(.mov, Type.usize, dst_mcv, .{ .register = .rbp });
+        break :result dst_mcv;
+    };
     return self.finishAir(inst, result, .{ .none, .none, .none });
 }
 
diff --git a/test/behavior/return_address.zig b/test/behavior/return_address.zig
@@ -7,7 +7,6 @@ fn retAddr() usize {
 
 test "return address" {
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO