compiler: move ApplyFunctionSections to transform package

transform/globals.go

@@ -0,0 +1,20 @@
+package transform
+
+import "tinygo.org/x/go-llvm"
+
+// This file implements small transformations on globals (functions and global
+// variables) for specific ABIs/architectures.
+
+// ApplyFunctionSections puts every function in a separate section. This makes
+// it possible for the linker to remove dead code. It is the equivalent of
+// passing -ffunction-sections to a C compiler.
+func ApplyFunctionSections(mod llvm.Module) {
+	llvmFn := mod.FirstFunction()
+	for !llvmFn.IsNil() {
+		if !llvmFn.IsDeclaration() {
+			name := llvmFn.Name()
+			llvmFn.SetSection(".text." + name)
+		}
+		llvmFn = llvm.NextFunction(llvmFn)
+	}
+}