Support for function summary index bitcode sections and files.
Summary:
The bitcode format is described in this document:
https://drive.google.com/file/d/0B036uwnWM6RWdnBLakxmeDdOeXc/view
For more info on ThinLTO see:
https://sites.google.com/site/llvmthinlto
The first customer is ThinLTO, however the data structures are designed
and named more generally based on prior feedback. There are a few
comments regarding how certain interfaces are used by ThinLTO, and the
options added here to gold currently have ThinLTO-specific names as the
behavior they provoke is currently ThinLTO-specific.
This patch includes support for generating per-module function indexes,
the combined index file via the gold plugin, and several tests
(more are included with the associated clang patch D11908).
Reviewers: dexonsmith, davidxl, joker.eph
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D13107
llvm-svn: 249270
diff --git a/llvm/tools/llvm-as/llvm-as.cpp b/llvm/tools/llvm-as/llvm-as.cpp
index 4455d24..d4e4d8d 100644
--- a/llvm/tools/llvm-as/llvm-as.cpp
+++ b/llvm/tools/llvm-as/llvm-as.cpp
@@ -45,6 +45,10 @@
DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
static cl::opt<bool>
+EmitFunctionSummary("function-summary", cl::desc("Emit function summary index"),
+ cl::init(false));
+
+static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
static cl::opt<bool>
@@ -77,7 +81,8 @@
}
if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
- WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder);
+ WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder,
+ EmitFunctionSummary);
// Declare success.
Out->keep();