[bindings/go] Add Go bindings to LLVMGetIndices

Summary: This instruction is useful for inspecting extractvalue/insertvalue in IR. Unlike most other operations, indices cannot be inspected using the generic Value.Opcode() function so a specialized function needs to be added.

Reviewers: whitequark, pcc

Reviewed By: whitequark

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D53883

llvm-svn: 346388

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/bindings/go/llvm/ir.go b/llvm/bindings/go/llvm/ir.go
index cad21814cd7..1872a2ffe51 100644
--- a/llvm/bindings/go/llvm/ir.go
+++ b/llvm/bindings/go/llvm/ir.go
@@ -1258,6 +1258,19 @@ func InlineAsm(t Type, asmString, constraints string, hasSideEffects, isAlignSta
 	return
 }
 
+// Operations on aggregates
+func (v Value) Indices() []uint32 {
+	num := C.LLVMGetNumIndices(v.C)
+	indicesPtr := C.LLVMGetIndices(v.C)
+	// https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices
+	rawIndices := (*[1 << 30]C.uint)(unsafe.Pointer(indicesPtr))[:num:num]
+	indices := make([]uint32, num)
+	for i := range indices {
+		indices[i] = uint32(rawIndices[i])
+	}
+	return indices
+}
+
 //-------------------------------------------------------------------------
 // llvm.Builder
 //-------------------------------------------------------------------------