Import LLVM 6.0.1 release including clang, lld and lldb.

"where is the kaboom?" deraadt@

1 files changed, 7 insertions, 3 deletions

diff --git a/gnu/llvm/docs/CoverageMappingFormat.rst b/gnu/llvm/docs/CoverageMappingFormat.rst
index 46cc9d10f31..30b11fe2f31 100644
--- a/gnu/llvm/docs/CoverageMappingFormat.rst
+++ b/gnu/llvm/docs/CoverageMappingFormat.rst
@@ -258,7 +258,7 @@ The coverage mapping variable generated by Clang has 3 fields:
       i32 2,  ; The number of function records
       i32 20, ; The length of the string that contains the encoded translation unit filenames
       i32 20, ; The length of the string that contains the encoded coverage mapping data
-      i32 1,  ; Coverage mapping format version
+      i32 2,  ; Coverage mapping format version
     },
     [2 x { i64, i32, i64 }] [ ; Function records
      { i64, i32, i64 } {
@@ -274,6 +274,8 @@ The coverage mapping variable generated by Clang has 3 fields:
    [40 x i8] c"..." ; Encoded data (dissected later)
   }, section "__llvm_covmap", align 8
 
+The current version of the format is version 3. The only difference from version 2 is that a special encoding for column end locations was introduced to indicate gap regions.
+
 The function record layout has evolved since version 1. In version 1, the function record for *foo* is defined as follows:
 
 .. code-block:: llvm
@@ -296,7 +298,7 @@ The coverage mapping header has the following fields:
 
 * The length of the string in the third field of *__llvm_coverage_mapping* that contains the encoded coverage mapping data.
 
-* The format version. The current version is 2 (encoded as a 1).
+* The format version. The current version is 3 (encoded as a 2).
 
 .. _function records:
 
@@ -602,4 +604,6 @@ The source range record contains the following fields:
 * *numLines*: The difference between the ending line and the starting line
   of the current mapping region.
 
-* *columnEnd*: The ending column of the mapping region.
+* *columnEnd*: The ending column of the mapping region. If the high bit is set,
+  the current mapping region is a gap area. A count for a gap area is only used
+  as the line execution count if there are no other regions on a line.