This patch produces the correct pointer size

value in the 64 bit .eh_frame section.

It doesn't however allow exception handling to work
yet since it depends on the correct relocation model
being set in the ELF header flags.


Contributer: Jack Carter
llvm-svn: 171881

llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp

@@ -24,6 +24,10 @@ MipsMCAsmInfo::MipsMCAsmInfo(const Target &T, StringRef TT) {
       (TheTriple.getArch() == Triple::mips64))
     IsLittleEndian = false;
 
+  if ((TheTriple.getArch() == Triple::mips64el) ||
+      (TheTriple.getArch() == Triple::mips64))
+    PointerSize = 8;
+
   AlignmentIsInBytes          = false;
   Data16bitsDirective         = "\t.2byte\t";
   Data32bitsDirective         = "\t.4byte\t";

llvm/test/MC/Mips/ef_frame.ll

+; This tests .eh_frame CIE descriptor for the.
+; Data alignment factor
+
+; RUN: llc -filetype=obj -mcpu=mips64r2 -mattr=n64 -march=mips64el %s -o - \
+; RUN: | llvm-objdump -s - | FileCheck %s
+
+; N64
+; CHECK: Contents of section .eh_frame:
+; CHECK-NEXT:  0000 1c000000 00000000 017a504c 52000178  .........zPLR..x
+; CHECK-NEXT:  0010 1f0b0000 00000000 00000000 000c1d00  ................
+; CHECK-NEXT:  0020 2c000000 24000000 00000000 00000000  ,...$...........
+; CHECK-NEXT:  0030 7c000000 00000000 08000000 00000000  |...............
+; CHECK-NEXT:  0040 00440e10 489f019c 02000000 00000000  .D..H...........
+
+; ModuleID = 'simple_throw.cpp'
+
+@_ZTIi = external constant i8*
+@str = private unnamed_addr constant [7 x i8] c"All ok\00"
+
+define i32 @main() {
+entry:
+  %exception.i = tail call i8* @__cxa_allocate_exception(i64 4) nounwind
+  %0 = bitcast i8* %exception.i to i32*
+  store i32 5, i32* %0, align 4
+  invoke void @__cxa_throw(i8* %exception.i, i8* bitcast (i8** @_ZTIi to i8*), i8* null) noreturn
+          to label %.noexc unwind label %return
+
+.noexc:                                           ; preds = %entry
+  unreachable
+
+return:                                           ; preds = %entry
+  %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          catch i8* null
+  %2 = extractvalue { i8*, i32 } %1, 0
+  %3 = tail call i8* @__cxa_begin_catch(i8* %2) nounwind
+  %puts = tail call i32 @puts(i8* getelementptr inbounds ([7 x i8]* @str, i64 0, i64 0))
+  tail call void @__cxa_end_catch()
+  ret i32 0
+}
+
+declare i32 @__gxx_personality_v0(...)
+
+declare i8* @__cxa_begin_catch(i8*)
+
+declare void @__cxa_end_catch()
+
+declare i8* @__cxa_allocate_exception(i64)
+
+declare void @__cxa_throw(i8*, i8*, i8*)
+
+declare i32 @puts(i8* nocapture) nounwind
+