Mark ARM eh_sjlj_dispatchsetup as clobbering all registers. Radar 10567930.

We used to rely on the *eh_sjlj_setjmp instructions to mark that a function
with setjmp/longjmp exception handling clobbers all the registers.  But with
the recent reorganization of ARM EH, those eh_sjlj_setjmp instructions are
expanded away earlier, before PEI can see them to determine what registers to
save and restore.  Mark the dispatchsetup instruction in the same way, since
that instruction cannot be expanded early.  This also more accurately reflects
when the registers are clobbered.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146949 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 516a0801ae36be1f9904131eb3f7ba1be55f9356..d4dc56158829b1366c3cd52d34f4fc469be77d26 100644 (file)
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -4741,8 +4741,11 @@ def Int_eh_sjlj_longjmp : PseudoInst<(outs), (ins GPR:$src, GPR:$scratch),
 // This pseudo is used for ARM, Thumb1 and Thumb2. Any differences are
 // handled when the pseudo is expanded (which happens before any passes
 // that need the instruction size).
-let isBarrier = 1 in
-def eh_sjlj_dispatchsetup : PseudoInst<(outs), (ins), NoItinerary, []>;
+let Defs =
+  [ R0,  R1,  R2,  R3,  R4,  R5,  R6,  R7,  R8,  R9,  R10, R11, R12, LR, CPSR,
+    QQQQ0, QQQQ1, QQQQ2, QQQQ3 ], isBarrier = 1 in {
+  def eh_sjlj_dispatchsetup : PseudoInst<(outs), (ins), NoItinerary, []>;
+}
 
 //===----------------------------------------------------------------------===//
 // Non-Instruction Patterns

diff --git a/test/CodeGen/ARM/2011-12-19-sjlj-clobber.ll b/test/CodeGen/ARM/2011-12-19-sjlj-clobber.ll
new file mode 100644 (file)
index 0000000..ddb7632
--- /dev/null
+++ b/test/CodeGen/ARM/2011-12-19-sjlj-clobber.ll
@@ -0,0 +1,55 @@
+; RUN: llc < %s -O0 -mtriple=thumbv7-apple-ios | FileCheck %s
+
+; Radar 10567930: Make sure that all the caller-saved registers are saved and
+; restored in a function with setjmp/longjmp EH.  In particular, r6 was not
+; being saved here.
+; CHECK: push {r4, r5, r6, r7, lr}
+
+%0 = type opaque
+%struct.NSConstantString = type { i32*, i32, i8*, i32 }
+
+define i32 @asdf(i32 %a, i32 %b, i8** %c, i8* %d) {
+bb:
+  %tmp = alloca i32, align 4
+  %tmp1 = alloca i32, align 4
+  %tmp2 = alloca i8*, align 4
+  %tmp3 = alloca i1
+  %myException = alloca %0*, align 4
+  %tmp4 = alloca i8*
+  %tmp5 = alloca i32
+  %exception = alloca %0*, align 4
+  store i32 %a, i32* %tmp, align 4
+  store i32 %b, i32* %tmp1, align 4
+  store i8* %d, i8** %tmp2, align 4
+  store i1 false, i1* %tmp3
+  %tmp7 = load i8** %c
+  %tmp10 = invoke %0* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to %0* (i8*, i8*, %0*)*)(i8* %tmp7, i8* %d, %0* null)
+          to label %bb11 unwind label %bb15
+
+bb11:                                             ; preds = %bb
+  store %0* %tmp10, %0** %myException, align 4
+  %tmp12 = load %0** %myException, align 4
+  %tmp13 = bitcast %0* %tmp12 to i8*
+  invoke void @objc_exception_throw(i8* %tmp13) noreturn
+          to label %bb14 unwind label %bb15
+
+bb14:                                             ; preds = %bb11
+  unreachable
+
+bb15:                                             ; preds = %bb11, %bb
+  %tmp16 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
+          catch i8* null
+  %tmp17 = extractvalue { i8*, i32 } %tmp16, 0
+  store i8* %tmp17, i8** %tmp4
+  %tmp18 = extractvalue { i8*, i32 } %tmp16, 1
+  store i32 %tmp18, i32* %tmp5
+  store i1 true, i1* %tmp3
+  br label %bb56
+
+bb56:
+  unreachable
+}
+
+declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
+declare i32 @__objc_personality_v0(...)
+declare void @objc_exception_throw(i8*)