mie: ir: implement generation and text output of phi instruction

mie/ir/builder.c

@@ -9,6 +9,7 @@
 #include <mie/ir/module.h>
 #include <mie/ir/msg.h>
 #include <mie/ir/op.h>
+#include <mie/ir/phi.h>
 #include <mie/ir/ptr.h>
 #include <mie/ir/record.h>
 #include <mie/type.h>
@@ -785,9 +786,47 @@ struct mie_value *mie_builder_setelementptr(
 	return NULL;
 }
 
-struct mie_phi *mie_builder_phi(
+struct mie_value *mie_builder_phi(
 	struct mie_builder *builder, struct mie_type *type,
-	unsigned int nr_edges, const char *name)
+	struct mie_phi_edge *edges, unsigned int nr_edges, const char *name)
 {
-	return NULL;
+	struct mie_block *block = builder->b_current_block;
+
+	if (!block) {
+		return NULL;
+	}
+
+	if (block->b_terminator || !b_queue_empty(&block->b_instr)) {
+		return NULL;
+	}
+
+	struct mie_phi *phi = malloc(sizeof *phi);
+	if (!phi) {
+		return NULL;
+	}
+
+	memset(phi, 0x0, sizeof *phi);
+
+	mie_instr_init(&phi->p_base, MIE_INSTR_PHI);
+
+	phi->p_type = type;
+	phi->p_nr_edges = nr_edges;
+	phi->p_edges = calloc(nr_edges, sizeof(struct mie_phi_edge));
+	if (!phi->p_edges) {
+		free(phi);
+		return NULL;
+	}
+
+	memcpy(phi->p_edges, edges, nr_edges * sizeof(struct mie_phi_edge));
+
+	if (!mie_block_add_instr(builder->b_current_block, &phi->p_base)) {
+		free(phi);
+		free(phi->p_edges);
+		return NULL;
+	}
+
+	mie_func_generate_value_name(
+		builder->b_current_block->b_parent, MIE_VALUE(phi), name);
+
+	return MIE_VALUE(phi);
 }