Frontend: Add CodeGenAction support for handling LLVM IR.

 - This magically enables using 'clang -cc1' as a replacement for most of 'llvm-as', 'llvm-dis', 'llc' and 'opt' functionality.

For example, 'llvm-as' is:
  $ clang -cc1 -emit-llvm-bc FOO.ll -o FOO.bc
and 'llvm-dis' is:
  $ clang -cc1 -emit-llvm    FOO.bc -o -
and 'opt' is, e.g.:
  $ clang -cc1 -emit-llvm -O3 -o FOO.opt.ll FOO.ll
and 'llc' is, e.g.:
  $ clang -cc1 -S -o - FOO.ll

The nice thing about using the backend tools this way is that they are guaranteed to exactly match how the compiler generates code (for example, setting the same backend options).

llvm-svn: 105583

2 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/Frontend/ir-support-codegen.ll b/clang/test/Frontend/ir-support-codegen.ll
new file mode 100644
index 00000000000..046b3af1c3e
--- /dev/null
+++ b/clang/test/Frontend/ir-support-codegen.ll
@@ -0,0 +1,8 @@
+; RUN: %clang_cc1 -S -o - %s | FileCheck %s
+
+target triple = "x86_64-apple-darwin10"
+
+; CHECK: .globl _f0
+define i32 @f0() nounwind ssp {
+       ret i32 0
+}
diff --git a/clang/test/Frontend/ir-support-errors.ll b/clang/test/Frontend/ir-support-errors.ll
new file mode 100644
index 00000000000..98227d46f7a
--- /dev/null
+++ b/clang/test/Frontend/ir-support-errors.ll
@@ -0,0 +1,8 @@
+; RUN: %clang_cc1 -S -o - %s 2>&1 | FileCheck %s
+
+target triple = "x86_64-apple-darwin10"
+
+define i32 @f0() nounwind ssp {
+; CHECK: {{.*}}ir-support-errors.ll:7:16: error: expected value token
+       ret i32 x
+}