Support using sample profiles with partial debug info.

Summary:
When using a profile, we used to require the use -gmlt so that we could
get access to the line locations. This is used to match line numbers in
the input profile to the line numbers in the function's IR.

But this is actually not necessary. The driver can provide source
location tracking without the emission of debug information. In these
cases, the annotation 'llvm.dbg.cu' is missing from the IR, but the
actual line location annotations are still present.

This patch adds a new way of looking for the start of the current
function. Instead of looking through the compile units in llvm.dbg.cu,
we can walk up the scope for the first instruction in the function with
a debug loc. If that describes the function, we use it. Otherwise, we
keep looking until we find one.

If no such instruction is found, we then give up and produce an error.

Reviewers: echristo, dblaikie

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5887

llvm-svn: 220382

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/test/Transforms/SampleProfile/calls.ll b/llvm/test/Transforms/SampleProfile/calls.ll
index a80eb956527..c39472bf906 100644
--- a/llvm/test/Transforms/SampleProfile/calls.ll
+++ b/llvm/test/Transforms/SampleProfile/calls.ll
@@ -15,7 +15,12 @@
 ;   printf("sum is %d\n", s);
 ;   return 0;
 ; }
-
+;
+; Note that this test is missing the llvm.dbg.cu annotation. This emulates
+; the effect of the user having only used -fprofile-sample-use without
+; -gmlt when invoking the driver. In those cases, we need to track source
+; location information but we do not have to generate debug info in the
+; final binary.
 @.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
 
 ; Function Attrs: nounwind uwtable
@@ -84,7 +89,6 @@ while.end:                                        ; preds = %while.cond
 
 declare i32 @printf(i8*, ...) #2
 
-!llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
 !llvm.ident = !{!10}