Generate DEBUG_VALUE comments on x86. The (limited)

dbg.declare's we currently generate go through both
register allocators without perturbing the results.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94480 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 09fd657fffd04750a740074a10f4658b8f68d365..b7dbd03fc3af384bc272bbe087ac11caccf1f24a 100644 (file)
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -343,6 +343,9 @@ bool FastISel::SelectCall(User *I) {
       if (MDNode *Dbg = DI->getMetadata("dbg"))
         MMI->setVariableDbgInfo(DI->getVariable(), FI, Dbg);
     }
+    // Building the map above is target independent.  Generating DEBUG_VALUE
+    // inline is target dependent; do this now.
+    (void)TargetSelectInstruction(cast<Instruction>(I));
     return true;
   }
   case Intrinsic::eh_exception: {

diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index d5ad61b26660c5782b0040f4483f84652bd71e3e..94dec7ce355dd09c7ee88058db0b477f36108acf 100644 (file)
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -1153,6 +1153,16 @@ bool X86FastISel::X86VisitIntrinsicCall(IntrinsicInst &I) {
   // FIXME: Handle more intrinsics.
   switch (I.getIntrinsicID()) {
   default: return false;
+  case Intrinsic::dbg_declare: {
+    DbgDeclareInst *DI = cast<DbgDeclareInst>(&I);
+    X86AddressMode AM;
+    if (!X86SelectAddress(DI->getAddress(), AM))
+      return false;
+    const TargetInstrDesc &II = TII.get(TargetInstrInfo::DEBUG_VALUE);
+    addFullAddress(BuildMI(MBB, DL, II), AM).addImm(0).
+                                        addMetadata(DI->getVariable());
+    return true;
+  }
   case Intrinsic::trap: {
     BuildMI(MBB, DL, TII.get(X86::TRAP));
     return true;

diff --git a/test/DebugInfo/2010-01-18-DbgValue.ll b/test/DebugInfo/2010-01-18-DbgValue.ll
new file mode 100644 (file)
index 0000000..ff97b18
--- /dev/null
+++ b/test/DebugInfo/2010-01-18-DbgValue.ll
@@ -0,0 +1,55 @@
+; RUN: llc -O0 < %s | FileCheck %s
+; ModuleID = 'try.c'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
+target triple = "i386-apple-darwin9.8"
+; Currently, dbg.declare generates a DEBUG_VALUE comment.  Eventually it will
+; generate DWARF and this test will need to be modified or removed.
+
+@Y = common global i32 0                          ; <i32*> [#uses=1]
+
+define i32 @test() nounwind {
+entry:
+; CHECK: DEBUG_VALUE:
+  %retval = alloca i32                            ; <i32*> [#uses=2]
+  %X = alloca i32                                 ; <i32*> [#uses=5]
+  %0 = alloca i32                                 ; <i32*> [#uses=2]
+  %"alloca point" = bitcast i32 0 to i32          ; <i32> [#uses=0]
+  call void @llvm.dbg.declare(metadata !{i32* %X}, metadata !3), !dbg !7
+  store i32 4, i32* %X, align 4, !dbg !8
+  %1 = load i32* %X, align 4, !dbg !9             ; <i32> [#uses=1]
+  call void @use(i32 %1) nounwind, !dbg !9
+  %2 = load i32* @Y, align 4, !dbg !10            ; <i32> [#uses=1]
+  %3 = add nsw i32 %2, 2, !dbg !10                ; <i32> [#uses=1]
+  store i32 %3, i32* %X, align 4, !dbg !10
+  %4 = load i32* %X, align 4, !dbg !11            ; <i32> [#uses=1]
+  call void @use(i32 %4) nounwind, !dbg !11
+  %5 = load i32* %X, align 4, !dbg !12            ; <i32> [#uses=1]
+  store i32 %5, i32* %0, align 4, !dbg !12
+  %6 = load i32* %0, align 4, !dbg !12            ; <i32> [#uses=1]
+  store i32 %6, i32* %retval, align 4, !dbg !12
+  br label %return, !dbg !12
+
+return:                                           ; preds = %entry
+  %retval1 = load i32* %retval, !dbg !12          ; <i32> [#uses=1]
+  ret i32 %retval1, !dbg !12
+}
+
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+declare void @use(i32)
+
+!llvm.dbg.gv = !{!0}
+
+!0 = metadata !{i32 458804, i32 0, metadata !1, metadata !"Y", metadata !"Y", metadata !"Y", metadata !1, i32 2, metadata !2, i1 false, i1 true, i32* @Y} ; [ DW_TAG_variable ]
+!1 = metadata !{i32 458769, i32 0, i32 1, metadata !"try.c", metadata !"/Volumes/MacOS9/tests/", metadata !"4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
+!2 = metadata !{i32 458788, metadata !1, metadata !"int", metadata !1, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+!3 = metadata !{i32 459008, metadata !4, metadata !"X", metadata !1, i32 4, metadata !2} ; [ DW_TAG_auto_variable ]
+!4 = metadata !{i32 458798, i32 0, metadata !1, metadata !"", metadata !"", metadata !"test", metadata !1, i32 3, metadata !5, i1 false, i1 true, i32 0, i32 0, null} ; [ DW_TAG_subprogram ]
+!5 = metadata !{i32 458773, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !6, i32 0} ; [ DW_TAG_subroutine_type ]
+!6 = metadata !{metadata !2}
+!7 = metadata !{i32 3, i32 0, metadata !4, null}
+!8 = metadata !{i32 4, i32 0, metadata !4, null}
+!9 = metadata !{i32 5, i32 0, metadata !4, null}
+!10 = metadata !{i32 6, i32 0, metadata !4, null}
+!11 = metadata !{i32 7, i32 0, metadata !4, null}
+!12 = metadata !{i32 8, i32 0, metadata !4, null}