[SystemZ] Support stackmaps and patchpoints

This adds back-end support for the @llvm.experimental.stackmap and
@llvm.experimental.patchpoint intrinsics.

llvm-svn: 326611

1 files changed, 65 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/patchpoint-invoke.ll b/llvm/test/CodeGen/SystemZ/patchpoint-invoke.ll
new file mode 100644
index 00000000000..a9bb7acd589
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/patchpoint-invoke.ll
@@ -0,0 +1,65 @@
+; RUN: llc -mtriple=s390x-linux-gnu < %s | FileCheck %s
+
+; Test invoking of patchpoints
+;
+define i64 @patchpoint_invoke(i64 %p1, i64 %p2) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+; CHECK-LABEL: patchpoint_invoke:
+; CHECK-NEXT:  [[FUNC_BEGIN:.L.*]]:
+; CHECK-NEXT: .cfi_startproc
+; CHECK:      .cfi_lsda 0, [[EXCEPTION_LABEL:.L[^ ]*]]
+; CHECK:      aghi %r15, -160
+
+; Unfortunately, hardcode the name of the label that begins the patchpoint:
+; CHECK:      .Ltmp0:
+; CHECK:      llilf   %r1, 559038736
+; CHECK-NEXT: basr    %r14, %r1
+; CHECK-NEXT: bcr     0, %r0
+; CHECK-NEXT: [[PP_END:.L.*]]:
+; CHECK:      br %r14
+  %resolveCall = inttoptr i64 559038736 to i8*
+  %result = invoke i64 (i64, i32, i8*, i32, ...) @llvm.experimental.patchpoint.i64(i64 2, i32 10, i8* %resolveCall, i32 1, i64 %p1, i64 %p2)
+            to label %success unwind label %threw
+
+success:
+  ret i64 %result
+
+threw:
+  %0 = landingpad { i8*, i32 }
+          catch i8* null
+  ret i64 0
+}
+
+; Verify that the exception table was emitted:
+; CHECK:      [[EXCEPTION_LABEL]]:
+; CHECK-NEXT: .byte 255
+; CHECK-NEXT: .byte 0
+; CHECK-NEXT: .uleb128 .Lttbase{{[0-9]+}}-[[TTBASEREF:.Lttbaseref[0-9]+]]
+; CHECK-NEXT: [[TTBASEREF]]:
+; CHECK-NEXT: .byte 1
+; CHECK-NEXT: .uleb128 .Lcst_end{{[0-9]+}}-[[CST_BEGIN:.Lcst_begin[0-9]+]]
+; CHECK-NEXT: [[CST_BEGIN]]:
+; Verify that the unwind data covers the entire patchpoint region:
+; CHECK-NEXT: .uleb128 .Ltmp0-[[FUNC_BEGIN]]
+; CHECK-NEXT: .uleb128 [[PP_END]]-.Ltmp0
+
+
+; Verify that the stackmap section got emitted:
+; CHECK-LABEL: __LLVM_StackMaps:
+; Header
+; CHECK-NEXT:   .byte 3
+; CHECK-NEXT:   .byte 0
+; CHECK-NEXT:   .short 0
+; Num Functions
+; CHECK-NEXT:   .long 1
+; Num LargeConstants
+; CHECK-NEXT:   .long 0
+; Num Callsites
+; CHECK-NEXT:   .long 1
+; CHECK-NEXT:   .quad patchpoint_invoke
+
+
+declare void @llvm.experimental.stackmap(i64, i32, ...)
+declare void @llvm.experimental.patchpoint.void(i64, i32, i8*, i32, ...)
+declare i64 @llvm.experimental.patchpoint.i64(i64, i32, i8*, i32, ...)
+declare i32 @__gxx_personality_v0(...)