[PATCH 05/13] libgo: Use the static chain for the closure

[Richard Henderson <rth@redhat.com>]

Doesn't delete the __go_get/set_closure routines yet, as they're
still referenced by the ffi code, to be updated in another patch.
---
 libgo/go/reflect/makefunc_386.S   | 22 +++++++++-------------
 libgo/go/reflect/makefunc_amd64.S | 13 ++++---------
 libgo/runtime/malloc.goc          |  8 --------
 libgo/runtime/mgc0.c              |  3 +--
 libgo/runtime/time.goc            |  3 +--
 5 files changed, 15 insertions(+), 34 deletions(-)

diff --git a/libgo/go/reflect/makefunc_386.S b/libgo/go/reflect/makefunc_386.S
index 0e2e764..c1caf1e 100644
--- a/libgo/go/reflect/makefunc_386.S
+++ b/libgo/go/reflect/makefunc_386.S
@@ -38,7 +38,8 @@ reflect.makeFuncStub:
 	movl	%esp, %ebp
 .LCFI1:
 	pushl	%ebx		/* In case this is PIC.  */
-	subl	$36, %esp	/* Enough for args and to align stack.  */
+	pushl	%ecx		/* Save static chain.  */
+	subl	$32, %esp	/* Enough for args and to align stack.  */
 .LCFI2:
 
 #ifdef __PIC__
@@ -47,7 +48,7 @@ reflect.makeFuncStub:
 #endif
 
 	leal	8(%ebp), %eax	/* Set esp field in struct.  */
-	movl	%eax, -24(%ebp)
+	movl	%eax, -32(%ebp)
 
 	/* For MakeFunc functions that call recover.  */
 	movl	4(%ebp), %eax
@@ -58,15 +59,10 @@ reflect.makeFuncStub:
 	call	__go_makefunc_can_recover
 #endif
 
-#ifdef __PIC__
-	call	__go_get_closure@PLT
-#else
-	call	__go_get_closure
-#endif
-
+	movl	-8(%ebp), %eax	/* Recover static chain.  */
 	movl	%eax, 4(%esp)
 
-	leal	-24(%ebp), %eax
+	leal	-32(%ebp), %eax
 	movl	%eax, (%esp)
 
 #ifdef __PIC__
@@ -84,21 +80,21 @@ reflect.makeFuncStub:
 
 	/* Set return registers.  */
 
-	movl	-20(%ebp), %eax
+	movl	-28(%ebp), %eax
 
 	cmpb	$0, -7(%ebp)
 	je	2f
 
-	fldl	-16(%ebp)
+	fldl	-24(%ebp)
 
 #ifdef __SSE2__
 	/* In case we are compiling with -msseregparm.  This won't work
 	   correctly if only SSE1 is supported, but that seems unlikely.  */
-	movsd	-16(%ebp), %xmm0
+	movsd	-24(%ebp), %xmm0
 #endif
 
 2:
-	movb	-8(%ebp), %dl
+	movb	-16(%ebp), %dl
 
 	addl	$36, %esp
 	popl	%ebx
diff --git a/libgo/go/reflect/makefunc_amd64.S b/libgo/go/reflect/makefunc_amd64.S
index 88302ee..f7db24f 100644
--- a/libgo/go/reflect/makefunc_amd64.S
+++ b/libgo/go/reflect/makefunc_amd64.S
@@ -41,7 +41,7 @@ reflect.makeFuncStub:
 	movq	%rsp, %rbp
 .LCFI1:
 
-	subq	$0xc0, %rsp		# Space for struct on stack.
+	subq	$0xd0, %rsp		# Space for struct on stack.
 
 	movq	%rax, 0x0(%rsp)
 	movq	%rdi, 0x8(%rsp)
@@ -61,6 +61,8 @@ reflect.makeFuncStub:
 	movdqa	%xmm6, 0xa0(%rsp)
 	movdqa	%xmm7, 0xb0(%rsp)
 
+	movq	%r10, 0xc0(%rsp)	# Save static chain around call.
+
 	/* For MakeFunc functions that call recover.  */
 	movq	8(%rbp), %rdi
 #ifdef __PIC__
@@ -69,14 +71,7 @@ reflect.makeFuncStub:
 	call	__go_makefunc_can_recover
 #endif
 
-	# Get function type.
-#ifdef __PIC__
-	call	__go_get_closure@PLT
-#else
-	call	__go_get_closure
-#endif
-	movq	%rax, %rsi
-
+	movq	0xc0(%rsp), %rsi	# Recover static chain.
 	movq	%rsp, %rdi
 
 #ifdef __PIC__
diff --git a/libgo/runtime/malloc.goc b/libgo/runtime/malloc.goc
index c5e64c8..0288722 100644
--- a/libgo/runtime/malloc.goc
+++ b/libgo/runtime/malloc.goc
@@ -84,7 +84,6 @@ runtime_mallocgc(uintptr size, uintptr typ, uint32 flag)
 	MLink *v, *next;
 	byte *tiny;
 	bool incallback;
-	void *closure;
 
 	if(size == 0) {
 		// All 0-length allocations use this pointer.
@@ -96,10 +95,6 @@ runtime_mallocgc(uintptr size, uintptr typ, uint32 flag)
 	m = runtime_m();
 	g = runtime_g();
 
-	// We should not be called in between __go_set_closure and the
-	// actual function call, but cope with it if we are.
-	closure = g->closure;
-
 	incallback = false;
 	if(m->mcache == nil && g->ncgo > 0) {
 		// For gccgo this case can occur when a cgo or SWIG function
@@ -180,7 +175,6 @@ runtime_mallocgc(uintptr size, uintptr typ, uint32 flag)
 					m->locks--;
 					if(incallback)
 						runtime_entersyscall();
-					g->closure = closure;
 					return v;
 				}
 			}
@@ -270,8 +264,6 @@ runtime_mallocgc(uintptr size, uintptr typ, uint32 flag)
 	if(incallback)
 		runtime_entersyscall();
 
-	g->closure = closure;
-
 	return v;
 }
 
diff --git a/libgo/runtime/mgc0.c b/libgo/runtime/mgc0.c
index dda1845..7726eec 100644
--- a/libgo/runtime/mgc0.c
+++ b/libgo/runtime/mgc0.c
@@ -133,8 +133,7 @@ clearpools(void)
 
 	// clear sync.Pool's
 	if(poolcleanup != nil) {
-		__go_set_closure(poolcleanup);
-		poolcleanup->fn();
+		poolcleanup->fn() __builtin_call_chain(poolcleanup);
 	}
 
 	for(pp=runtime_allp; (p=*pp) != nil; pp++) {
diff --git a/libgo/runtime/time.goc b/libgo/runtime/time.goc
index 220629b..645164c 100644
--- a/libgo/runtime/time.goc
+++ b/libgo/runtime/time.goc
@@ -239,8 +239,7 @@ timerproc(void* dummy __attribute__ ((unused)))
 			runtime_unlock(&timers);
 			if(raceenabled)
 				runtime_raceacquire(t);
-			__go_set_closure(fv);
-			f(now, arg);
+			f(now, arg) __builtin_call_chain(fv);
 
 			// clear f and arg to avoid leak while sleeping for next timer
 			f = nil;
-- 
1.9.3