allow backend to do its own custom abi handling and disable the generic beabi.h/.c stuff

[r27725]

ir/be/TEMPLATE/bearch_TEMPLATE.c

@@ -203,6 +203,7 @@ static TEMPLATE_isa_t TEMPLATE_isa_template = {
 		NULL,                        /* main environment */
 		7,                           /* costs for a spill instruction */
 		5,                           /* costs for a reload instruction */
+		false,                       /* no custom abi handling */
 	},
 };
 

ir/be/amd64/bearch_amd64.c

@@ -322,6 +322,7 @@ static amd64_isa_t amd64_isa_template = {
 		NULL,                        /* main environment */
 		7,                           /* costs for a spill instruction */
 		5,                           /* costs for a reload instruction */
+		false,                       /* no custom abi handling */
 	},
 };
 

ir/be/arm/bearch_arm.c

@@ -667,6 +667,7 @@ static arm_isa_t arm_isa_template = {
 		NULL,                  /* main environment */
 		7,                     /* spill costs */
 		5,                     /* reload costs */
+		false,                 /* no custom abi handling */
 	},
 	0,                     /* use generic register names instead of SP, LR, PC */
 	ARM_FPU_ARCH_FPE,      /* FPU architecture */

ir/be/beabi.c

@@ -2279,6 +2279,13 @@ be_abi_irg_t *be_abi_introduce(ir_graph *irg)
 		sp_req->type |= arch_register_req_type_ignore;
 	}
 
+	/* break here if backend provides a custom API.
+	 * Note: we shouldn't have to setup any be_abi_irg_t* stuff at all,
+	 * but need more cleanup to make this work
+	 */
+	if (arch_env->custom_abi)
+		return env;
+
 	env->init_sp = dummy = new_r_Dummy(irg, arch_env->sp->reg_class->mode);
 
 	env->calls = NEW_ARR_F(ir_node*, 0);

ir/be/bearch.h

@@ -750,6 +750,9 @@ struct arch_env_t {
 	const be_main_env_t   *main_env;         /**< the be main environment */
 	int                    spill_cost;       /**< cost for a be_Spill node */
 	int                    reload_cost;      /**< cost for a be_Reload node */
+	bool                   custom_abi : 1;   /**< backend does all abi handling
+	                                              and does not need the generic stuff
+	                                              from beabi.h/.c */
 };
 
 static inline unsigned arch_irn_get_n_outs(const ir_node *node)

ir/be/ia32/bearch_ia32.c

@@ -1541,6 +1541,7 @@ static ia32_isa_t ia32_isa_template = {
 		NULL,                    /* main environment */
 		7,                       /* costs for a spill instruction */
 		5,                       /* costs for a reload instruction */
+		false,                   /* no custom abi handling */
 	},
 	NULL,                    /* 16bit register names */
 	NULL,                    /* 8bit register names */

ir/be/sparc/bearch_sparc.c

@@ -341,6 +341,7 @@ static sparc_isa_t sparc_isa_template = {
 		NULL,                        /* main environment */
 		7,                           /* costs for a spill instruction */
 		5,                           /* costs for a reload instruction */
+		false,                       /* no custom abi handling */
 	},
 	NULL						/* current code generator */
 };