Improve testing for the C API

Summary:
This basically add an echo test case in C. The support is limited right now, but full support would just be too much to review at once.

The echo test case simply get a module as input and try to output the same exact module. This allow to check the both reading and writing API are working as expected.

I want to improve this test over time to support more and more of the API, in order to improve coverage (coverage is quite poor right now).

Test Plan: Run the test.

Reviewers: chandlerc, bogner

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10725

llvm-svn: 259844

llvm/test/Bindings/llvm-c/echo.ll

@@ -0,0 +1,32 @@
+; RUN: llvm-as < %s | llvm-dis > %t.orig
+; RUN: llvm-as < %s | llvm-c-test --echo > %t.echo
+; RUN: diff %t.orig %t.echo
+
+declare void @decl()
+
+; TODO: label, struct and metadata types
+define void @types() {
+  %1 = alloca half
+  %2 = alloca float
+  %3 = alloca double
+  %4 = alloca x86_fp80
+  %5 = alloca fp128
+  %6 = alloca ppc_fp128
+  %7 = alloca i7
+  %8 = alloca void (i1)*
+  %9 = alloca [3 x i22]
+  %10 = alloca i328 addrspace(5)*
+  %11 = alloca <5 x i23*>
+  %12 = alloca x86_mmx
+  ret void
+}
+
+define i32 @add(i32 %a, i32 %b) {
+  %1 = add i32 %a, %b
+  ret i32 %1
+}
+
+define i32 @call() {
+  %1 = call i32 @add(i32 23, i32 19)
+  ret i32 %1
+}

llvm/tools/llvm-c-test/CMakeLists.txt

@@ -37,6 +37,7 @@ endif ()
 add_llvm_tool(llvm-c-test
   calc.c
   disassemble.c
+  echo.cpp
   helpers.c
   include-all.c
   main.c

llvm/tools/llvm-c-test/calc.c

@@ -14,7 +14,6 @@
 \*===----------------------------------------------------------------------===*/
 
 #include "llvm-c-test.h"
-#include "llvm-c/Core.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>