From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 25 Sep 2017 15:37:14 +0000 (-0400)
Subject: Filter: add FILTER_OP_RETURN_S64 instruction
X-Git-Tag: v2.11.0-rc1~45
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=57ba4b4152578d463e8642ec0000cd3d6114ee6f;p=lttng-modules.git

Filter: add FILTER_OP_RETURN_S64 instruction

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/filter-bytecode.h b/filter-bytecode.h
index 2aa5c2d0..bd83d089 100644
--- a/filter-bytecode.h
+++ b/filter-bytecode.h
@@ -204,6 +204,8 @@ enum filter_op {
 
 	FILTER_OP_UNARY_BIT_NOT			= 98,
 
+	FILTER_OP_RETURN_S64			= 99,
+
 	NR_FILTER_OPS,
 };
 
diff --git a/lttng-filter-interpreter.c b/lttng-filter-interpreter.c
index 4e6c91a7..7263ce96 100644
--- a/lttng-filter-interpreter.c
+++ b/lttng-filter-interpreter.c
@@ -771,6 +771,8 @@ uint64_t lttng_filter_interpret_bytecode(void *filter_data,
 		[ FILTER_OP_LOAD_FIELD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_DOUBLE,
 
 		[ FILTER_OP_UNARY_BIT_NOT ] = &&LABEL_FILTER_OP_UNARY_BIT_NOT,
+
+		[ FILTER_OP_RETURN_S64 ] = &&LABEL_FILTER_OP_RETURN_S64,
 	};
 #endif /* #ifndef INTERPRETER_USE_SWITCH */
 
@@ -788,6 +790,7 @@ uint64_t lttng_filter_interpret_bytecode(void *filter_data,
 			goto end;
 
 		OP(FILTER_OP_RETURN):
+		OP(FILTER_OP_RETURN_S64):
 			/* LTTNG_FILTER_DISCARD  or LTTNG_FILTER_RECORD_FLAG */
 			retval = !!estack_ax_v;
 			ret = 0;
diff --git a/lttng-filter-specialize.c b/lttng-filter-specialize.c
index b9ddfb10..c0c3e110 100644
--- a/lttng-filter-specialize.c
+++ b/lttng-filter-specialize.c
@@ -518,6 +518,7 @@ int lttng_filter_specialize_bytecode(struct lttng_event *event,
 			goto end;
 
 		case FILTER_OP_RETURN:
+		case FILTER_OP_RETURN_S64:
 			ret = 0;
 			goto end;
 
diff --git a/lttng-filter-validator.c b/lttng-filter-validator.c
index c7b81bb6..051db49c 100644
--- a/lttng-filter-validator.c
+++ b/lttng-filter-validator.c
@@ -303,6 +303,7 @@ int bytecode_validate_overflow(struct bytecode_runtime *bytecode,
 	}
 
 	case FILTER_OP_RETURN:
+	case FILTER_OP_RETURN_S64:
 	{
 		if (unlikely(pc + sizeof(struct return_op)
 				> start_pc + bytecode->len)) {
@@ -586,6 +587,7 @@ int validate_instruction_context(struct bytecode_runtime *bytecode,
 	}
 
 	case FILTER_OP_RETURN:
+	case FILTER_OP_RETURN_S64:
 	{
 		goto end;
 	}
@@ -1183,6 +1185,28 @@ int exec_insn(struct bytecode_runtime *bytecode,
 		goto end;
 	}
 
+	case FILTER_OP_RETURN_S64:
+	{
+		if (!vstack_ax(stack)) {
+			printk(KERN_WARNING "Empty stack\n");
+			ret = -EINVAL;
+			goto end;
+		}
+		switch (vstack_ax(stack)->type) {
+		case REG_S64:
+			break;
+		default:
+		case REG_TYPE_UNKNOWN:
+			printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n",
+				(int) vstack_ax(stack)->type);
+			ret = -EINVAL;
+			goto end;
+		}
+
+		ret = 0;
+		goto end;
+	}
+
 	/* binary */
 	case FILTER_OP_MUL:
 	case FILTER_OP_DIV:
diff --git a/lttng-filter.c b/lttng-filter.c
index ff976743..86c21ee4 100644
--- a/lttng-filter.c
+++ b/lttng-filter.c
@@ -171,6 +171,8 @@ static const char *opnames[] = {
 	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",
 
 	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",
+
+	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
 };
 
 const char *lttng_filter_print_op(enum filter_op op)