Native implementation of coroutines to improve performance of fibers

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 108 insertions, 0 deletions

diff --git a/coroutine/win64/Context.asm b/coroutine/win64/Context.asm
new file mode 100644
index 0000000000..f57d3fd387
--- /dev/null
+++ b/coroutine/win64/Context.asm
@@ -0,0 +1,44 @@
+;;
+;;  win64.asm
+;;  File file is part of the "Coroutine" project and released under the MIT License.
+;;
+;;  Created by Samuel Williams on 10/5/2018.
+;;  Copyright, 2018, by Samuel Williams. All rights reserved.
+;;
+
+.code
+
+coroutine_transfer proc
+	push rbp
+	push rbx
+	push rdi
+	push rsi
+	push r12
+	push r13
+	push r14
+	push r15
+	
+	; Save caller stack pointer
+	mov [rcx], rsp 
+	
+	; Restore callee stack pointer
+	mov rsp, [rdx]
+
+	; Restore callee stack
+	pop r15
+	pop r14
+	pop r13
+	pop r12
+	pop rsi
+	pop rdi
+	pop rbx
+	pop rbp
+
+	; Put the first argument into the return value
+	mov rax, rcx
+
+	; We pop the return address and jump to it
+	ret
+coroutine_transfer endp
+
+end
diff --git a/coroutine/win64/Context.h b/coroutine/win64/Context.h
new file mode 100644
index 0000000000..53d9d43ae6
--- /dev/null
+++ b/coroutine/win64/Context.h
@@ -0,0 +1,64 @@
+//
+//  win64.h
+//  File file is part of the "Coroutine" project and released under the MIT License.
+//
+//  Created by Samuel Williams on 10/5/2018.
+//  Copyright, 2018, by Samuel Williams. All rights reserved.
+//
+
+#pragma once
+
+#include <assert.h>
+#include <string.h>
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#define COROUTINE void
+
+const size_t COROUTINE_REGISTERS = 8;
+
+// The fiber context (stack pointer).
+struct coroutine_context
+{
+	void **stack_pointer;
+};
+
+// The initialization function.
+typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self);
+
+inline void coroutine_initialize(
+	coroutine_context *context,
+	coroutine_start start,
+	void *stack_pointer,
+	size_t stack_size
+) {
+	context->stack_pointer = (void**)stack_pointer;
+
+	if (!start) {
+		assert(!context->stack_pointer);
+		/* We are main coroutine for this thread */
+		return;
+	}
+
+	/* Windows Thread Information Block */
+	*--context->stack_pointer = 0;
+	*--context->stack_pointer = stack_pointer;
+	*--context->stack_pointer = (void*)stack_size;
+
+	*--context->stack_pointer = (void*)start;
+
+	context->stack_pointer -= COROUTINE_REGISTERS;
+	memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
+}
+
+coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target);
+
+inline void coroutine_destroy(coroutine_context * context)
+{
+}
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file