[libclang] Expose some target information via the C API.

This allows users to query the target triple and target pointer width, which
would make me able to fix https://github.com/servo/rust-bindgen/issues/593 and
other related bugs in an elegant way (without having to manually parse the
target triple in the command line arguments).

Differential Revision: https://reviews.llvm.org/D32389

llvm-svn: 301648

1 files changed, 37 insertions, 1 deletions

diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index c3a48228869..c50ac1b6d24 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -32,7 +32,7 @@
  * compatible, thus CINDEX_VERSION_MAJOR is expected to remain stable.
  */
 #define CINDEX_VERSION_MAJOR 0
-#define CINDEX_VERSION_MINOR 37
+#define CINDEX_VERSION_MINOR 38
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -81,6 +81,12 @@ extern "C" {
 typedef void *CXIndex;
 
 /**
+ * \brief An opaque type representing target information for a given translation
+ * unit.
+ */
+typedef struct CXTargetInfoImpl *CXTargetInfo;
+
+/**
  * \brief A single translation unit, which resides in an index.
  */
 typedef struct CXTranslationUnitImpl *CXTranslationUnit;
@@ -1553,6 +1559,36 @@ CINDEX_LINKAGE CXTUResourceUsage clang_getCXTUResourceUsage(CXTranslationUnit TU
 CINDEX_LINKAGE void clang_disposeCXTUResourceUsage(CXTUResourceUsage usage);
 
 /**
+ * \brief Get target information for this translation unit.
+ *
+ * The CXTargetInfo object cannot outlive the CXTranslationUnit object.
+ */
+CINDEX_LINKAGE CXTargetInfo
+clang_getTranslationUnitTargetInfo(CXTranslationUnit CTUnit);
+
+/**
+ * \brief Destroy the CXTargetInfo object.
+ */
+CINDEX_LINKAGE void
+clang_TargetInfo_dispose(CXTargetInfo Info);
+
+/**
+ * \brief Get the normalized target triple as a string.
+ *
+ * Returns the empty string in case of any error.
+ */
+CINDEX_LINKAGE CXString
+clang_TargetInfo_getTriple(CXTargetInfo Info);
+
+/**
+ * \brief Get the pointer width of the target in bits.
+ *
+ * Returns -1 in case of error.
+ */
+CINDEX_LINKAGE int
+clang_TargetInfo_getPointerWidth(CXTargetInfo Info);
+
+/**
  * @}
  */