Add a DiagnosticManager replace error streams in the expression parser.

We want to do a better job presenting errors that occur when evaluating
expressions. Key to this effort is getting away from a model where all
errors are spat out onto a stream where the client has to take or leave
all of them.

To this end, this patch adds a new class, DiagnosticManager, which
contains errors produced by the compiler or by LLDB as an expression
is created. The DiagnosticManager can dump itself to a log as well as
to a string. Clients will (in the future) be able to filter out the
errors they're interested in by ID or present subsets of these errors
to the user.

This patch is not intended to change the *users* of errors - only to
thread DiagnosticManagers to all the places where streams are used. I
also attempt to standardize our use of errors a bit, removing trailing
newlines and making clients omit 'error:', 'warning:' etc. and instead
pass the Severity flag.

The patch is testsuite-neutral, with modifications to one part of the
MI tests because it relied on "error: error:" being erroneously
printed. This patch fixes the MI variable handling and the testcase.

<rdar://problem/22864976>

llvm-svn: 263859

1 files changed, 2 insertions, 2 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-mi/variable/TestMiVar.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-mi/variable/TestMiVar.py
index 1b7b048dcd6..fa9a1e7b2f4 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-mi/variable/TestMiVar.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-mi/variable/TestMiVar.py
@@ -36,9 +36,9 @@ class MiVarTestCase(lldbmi_testcase.MiTestCaseBase):
 
         # Print non-existant variable
         self.runCmd("-var-create var1 * undef")
-        self.expect("\^error,msg=\"error: error: use of undeclared identifier \'undef\'\\\\nerror: 1 errors parsing expression\\\\n\"")
+        self.expect("\^error,msg=\"error: use of undeclared identifier \'undef\'\\\\nerror: 1 error parsing expression\\\\n\"")
         self.runCmd("-data-evaluate-expression undef")
-        self.expect("\^error,msg=\"error: use of undeclared identifier \'undef\'\\\\nerror: 1 errors parsing expression\\\\n\"")
+        self.expect("\^error,msg=\"error: use of undeclared identifier \'undef\'\\\\nerror: 1 error parsing expression\\\\n\"")
 
         # Print global "g_MyVar", modify, delete and create again
         self.runCmd("-data-evaluate-expression g_MyVar")