Allow for `-use-static-map-calls` which generates a get procedure per `map`; add `runtime.map_get`

11 files changed, 302 insertions, 34 deletions

diff --git a/core/runtime/dynamic_map_internal.odin b/core/runtime/dynamic_map_internal.odin
index 7e453b4b8..b9b10dd40 100644
--- a/core/runtime/dynamic_map_internal.odin
+++ b/core/runtime/dynamic_map_internal.odin
@@ -137,6 +137,47 @@ map_cell_index_dynamic_const :: proc "contextless" (base: uintptr, #no_alias inf
 	return base + (cell_index * size_of_cell) + (data_index * size_of_type)
 }
 
+// We always round the capacity to a power of two so this becomes [16]Foo, which
+// works out to [4]Cell(Foo).
+//
+// The following compile-time procedure indexes such a [N]Cell(T) structure as
+// if it were a flat array accounting for the internal padding introduced by the
+// Cell structure.
+map_cell_index_static :: #force_inline proc "contextless" (cells: [^]Map_Cell($T), index: uintptr) -> ^T #no_bounds_check {
+	N :: size_of(Map_Cell(T){}.data) / size_of(T) when size_of(T) > 0 else 1
+
+	#assert(N <= MAP_CACHE_LINE_SIZE)
+
+	// No padding case, can treat as a regular array of []T.
+	when size_of(Map_Cell(T)) == size_of([N]T) {
+		return &([^]T)(cells)[index]
+	}
+
+	// Likely case, N is a power of two because T is a power of two.
+	when (N & (N - 1)) == 0 {
+		// Compute the integer log 2 of N, this is the shift amount to index the
+		// correct cell. Odin's intrinsics.count_leading_zeros does not produce a
+		// constant, hence this approach. We only need to check up to N = 64.
+		SHIFT :: 1 when N < 2  else
+		         2 when N < 4  else
+		         3 when N < 8  else
+		         4 when N < 16 else
+		         5 when N < 32 else 6
+		#assert(SHIFT <= MAP_CACHE_LINE_LOG2)
+		// Unique case, no need to index data here since only one element.
+		when N == 1 {
+			return &cells[index >> SHIFT].data[0]
+		} else {
+			return &cells[index >> SHIFT].data[index & (N - 1)]
+		}
+	}
+
+	// Least likely (and worst case), we pay for a division operation but we
+	// assume the compiler does not actually generate a division. N will be in the
+	// range [1, CACHE_LINE_SIZE) and not a power of two.
+	return &cells[index / N].data[index % N]
+}
+
 // len() for map
 map_len :: #force_inline proc "contextless" (m: Raw_Map) -> int {
 	return m.len
@@ -721,27 +762,72 @@ map_clear_dynamic :: #force_inline proc "contextless" (#no_alias m: ^Raw_Map, #n
 }
 
 
+map_kvh_data_static :: #force_inline proc "contextless" (m: $T/map[$K]$V) -> ([^]Map_Cell(K), [^]Map_Cell(V), [^]Map_Hash) {
+	H :: Map_Hash
+	capacity := uintptr(cap(m))
+	ks := ([^]Map_Cell(K))(map_data(transmute(Raw_Map)m))
+	vs := ([^]Map_Cell(V))(map_cell_index_static(ks, capacity))
+	hs := ([^]Map_Cell(H))(map_cell_index_static(vs, capacity))
+	return ks, vs, ([^]Map_Hash)(hs)
+}
+
+
+map_get :: proc "contextless" (m: $T/map[$K]$V, key: K) -> (stored_key: K, stored_value: V, ok: bool) {
+	rm := transmute(Raw_Map)m
+	if rm.len == 0 {
+		return
+	}
+	info := intrinsics.type_map_info(T)
+	key := key
+
+	h := info.key_hasher(&key, 0)
+	pos := map_desired_position(rm, h)
+	distance := uintptr(0)
+	mask := (uintptr(1) << map_log2_cap(rm)) - 1
+	ks, vs, hs := map_kvh_data_static(m)
+	for {
+		element_hash := hs[pos]
+		if map_hash_is_empty(element_hash) {
+			return
+		} else if distance > map_probe_distance(rm, element_hash, pos) {
+			return
+		} else if element_hash == h {
+			element_key := map_cell_index_static(ks, pos)
+			if info.key_equal(&key, rawptr(element_key)) {
+				element_value := map_cell_index_static(vs, pos)
+				stored_key   = (^K)(element_key)^
+				stored_value = (^V)(element_value)^
+				ok = true
+				return
+			}
+
+		}
+		pos = (pos + 1) & mask
+		distance += 1
+	}
+}
+
 __dynamic_map_get :: proc "contextless" (m: Raw_Map, #no_alias info: ^Map_Info, key: rawptr) -> (ptr: rawptr) {
 	if m.len == 0 {
 		return nil
 	}
 
 	h := info.key_hasher(key, 0)
-	p := map_desired_position(m, h)
-	d := uintptr(0)
-	c := (uintptr(1) << map_log2_cap(m)) - 1
+	pos := map_desired_position(m, h)
+	distance := uintptr(0)
+	mask := (uintptr(1) << map_log2_cap(m)) - 1
 	ks, vs, hs, _, _ := map_kvh_data_dynamic(m, info)
 	for {
-		element_hash := hs[p]
+		element_hash := hs[pos]
 		if map_hash_is_empty(element_hash) {
 			return nil
-		} else if d > map_probe_distance(m, element_hash, p) {
+		} else if distance > map_probe_distance(m, element_hash, pos) {
 			return nil
-		} else if element_hash == h && info.key_equal(key, rawptr(map_cell_index_dynamic(ks, info.ks, p))) {
-			return rawptr(map_cell_index_dynamic(vs, info.vs, p))
+		} else if element_hash == h && info.key_equal(key, rawptr(map_cell_index_dynamic(ks, info.ks, pos))) {
+			return rawptr(map_cell_index_dynamic(vs, info.vs, pos))
 		}
-		p = (p + 1) & c
-		d += 1
+		pos = (pos + 1) & mask
+		distance += 1
 	}
 }
 
diff --git a/src/build_settings.cpp b/src/build_settings.cpp
index 8067d1d01..1cd2899c4 100644
--- a/src/build_settings.cpp
+++ b/src/build_settings.cpp
@@ -307,6 +307,8 @@ struct BuildContext {
 
 	bool   disallow_rtti;
 
+	bool   use_static_map_calls;
+
 	RelocMode reloc_mode;
 	bool   disable_red_zone;
 
diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index c2753e979..045b22ca2 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -3244,7 +3244,12 @@ void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, Type *type_hint
 				check_assignment(c, x, yt->Map.key, str_lit("map 'not_in'"));
 			}
 
-			add_package_dependency(c, "runtime", "__dynamic_map_get");
+			if (build_context.use_static_map_calls) {
+				add_package_dependency(c, "runtime", "map_desired_position");
+				add_package_dependency(c, "runtime", "map_probe_distance");
+			} else {
+				add_package_dependency(c, "runtime", "__dynamic_map_get");
+			}
 		} else if (is_type_bit_set(rhs_type)) {
 			Type *yt = base_type(rhs_type);
 
@@ -8992,8 +8997,14 @@ ExprKind check_index_expr(CheckerContext *c, Operand *o, Ast *node, Type *type_h
 		o->type = t->Map.value;
 		o->expr = node;
 
-		add_package_dependency(c, "runtime", "__dynamic_map_get");
+
 		add_package_dependency(c, "runtime", "__dynamic_map_set");
+		if (build_context.use_static_map_calls) {
+			add_package_dependency(c, "runtime", "map_desired_position");
+			add_package_dependency(c, "runtime", "map_probe_distance");
+		} else {
+			add_package_dependency(c, "runtime", "__dynamic_map_get");
+		}
 		return Expr_Expr;
 	}
 
diff --git a/src/checker.cpp b/src/checker.cpp
index 75a6da6fa..d48b37b26 100644
--- a/src/checker.cpp
+++ b/src/checker.cpp
@@ -926,6 +926,10 @@ void init_universal(void) {
 
 		Type *hasher_args[2] = {t_rawptr, t_uintptr};
 		t_hasher_proc = alloc_type_proc_from_types(hasher_args, 2, t_uintptr, false, ProcCC_Contextless);
+
+		Type *map_get_args[2] = {/*map*/t_rawptr, /*key*/t_rawptr};
+		t_map_get_proc = alloc_type_proc_from_types(map_get_args, 2, t_rawptr, false, ProcCC_Contextless);
+
 	}
 
 // Constants
diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index 629daf1c9..2b95c5b2f 100644
--- a/src/llvm_backend.cpp
+++ b/src/llvm_backend.cpp
@@ -157,8 +157,8 @@ lbValue lb_get_equal_proc_for_type(lbModule *m, Type *type) {
 
 	static u32 proc_index = 0;
 
-	char buf[16] = {};
-	isize n = gb_snprintf(buf, 16, "__$equal%u", ++proc_index);
+	char buf[32] = {};
+	isize n = gb_snprintf(buf, 32, "__$equal%u", ++proc_index);
 	char *str = gb_alloc_str_len(permanent_allocator(), buf, n-1);
 	String proc_name = make_string_c(str);
 
@@ -280,8 +280,8 @@ lbValue lb_simple_compare_hash(lbProcedure *p, Type *type, lbValue data, lbValue
 	i64 sz = type_size_of(type);
 
 	if (1 <= sz && sz <= 16) {
-		char name[20] = {};
-		gb_snprintf(name, 20, "default_hasher%d", cast(i32)sz);
+		char name[32] = {};
+		gb_snprintf(name, 32, "default_hasher%d", cast(i32)sz);
 
 		auto args = array_make<lbValue>(permanent_allocator(), 2);
 		args[0] = data;
@@ -310,8 +310,8 @@ lbValue lb_get_hasher_proc_for_type(lbModule *m, Type *type) {
 
 	static u32 proc_index = 0;
 
-	char buf[16] = {};
-	isize n = gb_snprintf(buf, 16, "__$hasher%u", ++proc_index);
+	char buf[32] = {};
+	isize n = gb_snprintf(buf, 32, "__$hasher%u", ++proc_index);
 	char *str = gb_alloc_str_len(permanent_allocator(), buf, n-1);
 	String proc_name = make_string_c(str);
 
@@ -454,6 +454,141 @@ lbValue lb_get_hasher_proc_for_type(lbModule *m, Type *type) {
 }
 
 
+lbValue lb_get_map_get_proc_for_type(lbModule *m, Type *type) {
+	GB_ASSERT(build_context.use_static_map_calls);
+	type = base_type(type);
+	GB_ASSERT(type->kind == Type_Map);
+
+
+	lbProcedure **found = map_get(&m->map_get_procs, type);
+	if (found) {
+		GB_ASSERT(*found != nullptr);
+		return {(*found)->value, (*found)->type};
+	}
+	static u32 proc_index = 0;
+
+	char buf[32] = {};
+	isize n = gb_snprintf(buf, 32, "__$map_get%u", ++proc_index);
+	char *str = gb_alloc_str_len(permanent_allocator(), buf, n-1);
+	String proc_name = make_string_c(str);
+
+	lbProcedure *p = lb_create_dummy_procedure(m, proc_name, t_map_get_proc);
+	map_set(&m->map_get_procs, type, p);
+	lb_begin_procedure_body(p);
+	defer (lb_end_procedure_body(p));
+
+	LLVMValueRef x = LLVMGetParam(p->value, 0);
+	LLVMValueRef y = LLVMGetParam(p->value, 1);
+	lbValue map_ptr = {x, t_rawptr};
+	lbValue key_ptr = {y, t_rawptr};
+
+	LLVMAttributeRef nonnull_attr = lb_create_enum_attribute(m->ctx, "nonnull");
+	LLVMAttributeRef noalias_attr = lb_create_enum_attribute(m->ctx, "noalias");
+	LLVMAddAttributeAtIndex(p->value, 1+0, nonnull_attr);
+	LLVMAddAttributeAtIndex(p->value, 1+0, noalias_attr);
+	LLVMAddAttributeAtIndex(p->value, 1+1, nonnull_attr);
+	LLVMAddAttributeAtIndex(p->value, 1+1, noalias_attr);
+
+	map_ptr = lb_emit_conv(p, map_ptr, t_raw_map_ptr);
+	lbValue map = lb_emit_load(p, map_ptr);
+
+	key_ptr = lb_emit_conv(p, key_ptr, alloc_type_pointer(type->Map.key));
+	lbValue key = lb_emit_load(p, key_ptr);
+
+	lbValue h = lb_gen_map_key_hash(p, key, type->Map.key, nullptr);
+	lbAddr pos = lb_add_local_generated(p, t_uintptr, false);
+	lbAddr distance = lb_add_local_generated(p, t_uintptr, true);
+	lbValue capacity = lb_map_cap(p, map);
+	lbValue mask = lb_emit_conv(p, lb_emit_arith(p, Token_Sub, capacity, lb_const_int(m, t_int, 1), t_int), t_uintptr);
+
+	{
+		auto args = array_make<lbValue>(heap_allocator(), 2);
+		args[0] = map;
+		args[1] = h;
+		lb_addr_store(p, pos, lb_emit_runtime_call(p, "map_desired_position", args));
+	}
+	lbValue zero_uintptr = lb_const_int(m, t_uintptr, 0);
+	lbValue one_uintptr = lb_const_int(m, t_uintptr, 1);
+
+	lbValue ks = lb_map_data_uintptr(p, map);
+	lbValue vs = lb_map_cell_index_static(p, type->Map.key, ks, capacity);
+	lbValue hs = lb_map_cell_index_static(p, type->Map.value, vs, capacity);
+
+	ks = lb_emit_conv(p, ks, alloc_type_pointer(type->Map.key));
+	vs = lb_emit_conv(p, vs, alloc_type_pointer(type->Map.value));
+	hs = lb_emit_conv(p, hs, alloc_type_pointer(t_uintptr));
+
+	// lbValue res =
+	// LLVMBuildRet(p->builder, res.value);
+
+	lbBlock *loop = lb_create_block(p, "loop");
+	lbBlock *probe_block = lb_create_block(p, "probe");
+	lbBlock *increment_block = lb_create_block(p, "increment");
+	lbBlock *hash_compare_block = lb_create_block(p, "hash_compare");
+	lbBlock *key_compare_block = lb_create_block(p, "key_compare");
+	lbBlock *value_block = lb_create_block(p, "value");
+	lbBlock *nil_block = lb_create_block(p, "nil");
+
+	lb_emit_jump(p, loop);
+	lb_start_block(p, loop);
+
+	lbValue element_hash = lb_emit_load(p, lb_emit_ptr_offset(p, hs, lb_addr_load(p, pos)));
+	{
+		// if element_hash == 0 { return nil }
+		lb_emit_if(p, lb_emit_comp(p, Token_CmpEq, element_hash, zero_uintptr), nil_block, probe_block);
+	}
+
+	lb_start_block(p, probe_block);
+	{
+		auto args = array_make<lbValue>(heap_allocator(), 3);
+		args[0] = map;
+		args[1] = element_hash;
+		args[2] = lb_addr_load(p, pos);
+		lbValue probe_distance = lb_emit_runtime_call(p, "map_probe_distance", args);
+		lbValue cond = lb_emit_comp(p, Token_Gt, lb_addr_load(p, distance), probe_distance);
+		lb_emit_if(p, cond, nil_block, hash_compare_block);
+	}
+
+	lb_start_block(p, hash_compare_block);
+	{
+		lb_emit_if(p, lb_emit_comp(p, Token_CmpEq, element_hash, h), key_compare_block, increment_block);
+	}
+
+	lb_start_block(p, key_compare_block);
+	{
+		lbValue element_key = lb_map_cell_index_static(p, type->Map.key, ks, lb_addr_load(p, pos));
+		element_key = lb_emit_conv(p, element_key, ks.type);
+		lbValue cond = lb_emit_comp(p, Token_CmpEq, lb_emit_load(p, element_key), key);
+		lb_emit_if(p, cond, value_block, increment_block);
+	}
+
+	lb_start_block(p, value_block);
+	{
+		lbValue element_value = lb_map_cell_index_static(p, type->Map.value, vs, lb_addr_load(p, pos));
+		element_value = lb_emit_conv(p, element_value, t_rawptr);
+		LLVMBuildRet(p->builder, element_value.value);
+	}
+
+	lb_start_block(p, increment_block);
+	{
+		lbValue pp = lb_addr_load(p, pos);
+		pp = lb_emit_arith(p, Token_Add, pp, one_uintptr, t_uintptr);
+		pp = lb_emit_arith(p, Token_And, pp, mask, t_uintptr);
+		lb_addr_store(p, pos, pp);
+		lb_emit_increment(p, distance.addr);
+	}
+	lb_emit_jump(p, loop);
+
+	lb_start_block(p, nil_block);
+	{
+		lbValue res = lb_const_nil(m, t_rawptr);
+		LLVMBuildRet(p->builder, res.value);
+	}
+
+
+	return {p->value, p->type};
+}
+
 lbValue lb_generate_anonymous_proc_lit(lbModule *m, String const &prefix_name, Ast *expr, lbProcedure *parent) {
 	lbProcedure **found = map_get(&m->gen->anonymous_proc_lits, expr);
 	if (found) {
@@ -626,16 +761,27 @@ lbValue lb_internal_dynamic_map_get_ptr(lbProcedure *p, lbValue const &map, lbVa
 	Type *map_type = base_type(map.type);
 	GB_ASSERT(map_type->kind == Type_Map);
 
+	lbValue ptr = {};
+
 	lbValue key_ptr = lb_address_from_load_or_generate_local(p, key);
 	key_ptr = lb_emit_conv(p, key_ptr, t_rawptr);
 
-	auto args = array_make<lbValue>(permanent_allocator(), 3);
-	args[0] = lb_emit_transmute(p, map, t_raw_map);
-	args[1] = lb_gen_map_info_ptr(p->module, map_type);
-	args[2] = key_ptr;
+	if (build_context.use_static_map_calls) {
+		lbValue map_get_proc = lb_get_map_get_proc_for_type(p->module, map_type);
 
-	lbValue ptr = lb_emit_runtime_call(p, "__dynamic_map_get", args);
+		auto args = array_make<lbValue>(permanent_allocator(), 2);
+		args[0] = lb_address_from_load_or_generate_local(p, map);
+		args[1] = key_ptr;
 
+		ptr = lb_emit_call(p, map_get_proc, args);
+	} else {
+		auto args = array_make<lbValue>(permanent_allocator(), 3);
+		args[0] = lb_emit_transmute(p, map, t_raw_map);
+		args[1] = lb_gen_map_info_ptr(p->module, map_type);
+		args[2] = key_ptr;
+
+		ptr = lb_emit_runtime_call(p, "__dynamic_map_get", args);
+	}
 	return lb_emit_conv(p, ptr, alloc_type_pointer(map_type->Map.value));
 }
 
@@ -1206,6 +1352,10 @@ WORKER_TASK_PROC(lb_llvm_function_pass_worker_proc) {
 		lbProcedure *p = m->hasher_procs.entries[i].value;
 		lb_run_function_pass_manager(default_function_pass_manager, p);
 	}
+	for_array(i, m->map_get_procs.entries) {
+		lbProcedure *p = m->map_get_procs.entries[i].value;
+		lb_run_function_pass_manager(default_function_pass_manager, p);
+	}
 
 	return 0;
 }
diff --git a/src/llvm_backend.hpp b/src/llvm_backend.hpp
index 6c7c2e392..f9fe6cff0 100644
--- a/src/llvm_backend.hpp
+++ b/src/llvm_backend.hpp
@@ -144,6 +144,7 @@ struct lbModule {
 
 	PtrMap<Type *, lbProcedure *> equal_procs;
 	PtrMap<Type *, lbProcedure *> hasher_procs;
+	PtrMap<Type *, lbProcedure *> map_get_procs;
 
 	u32 nested_type_name_guid;
 
diff --git a/src/llvm_backend_general.cpp b/src/llvm_backend_general.cpp
index e1a926255..859542fb5 100644
--- a/src/llvm_backend_general.cpp
+++ b/src/llvm_backend_general.cpp
@@ -67,6 +67,7 @@ void lb_init_module(lbModule *m, Checker *c) {
 	map_init(&m->function_type_map, a);
 	map_init(&m->equal_procs, a);
 	map_init(&m->hasher_procs, a);
+	map_init(&m->map_get_procs, a);
 	array_init(&m->procedures_to_generate, a, 0, 1024);
 	array_init(&m->missing_procedures_to_check, a, 0, 16);
 	map_init(&m->debug_values, a);
diff --git a/src/llvm_backend_stmt.cpp b/src/llvm_backend_stmt.cpp
index 3e4846f02..6b83068ce 100644
--- a/src/llvm_backend_stmt.cpp
+++ b/src/llvm_backend_stmt.cpp
@@ -371,24 +371,30 @@ void lb_build_range_indexed(lbProcedure *p, lbValue expr, Type *val_type, lbValu
 }
 
 lbValue lb_map_cell_index_static(lbProcedure *p, Type *type, lbValue cells_ptr, lbValue index) {
-	i64 size, N;
-	i64 sz = type_size_of(type);
-	map_cell_size_and_len(type, &size, &N);
+	i64 size, len;
+	i64 elem_sz = type_size_of(type);
+	map_cell_size_and_len(type, &size, &len);
 
-	index = lb_emit_conv(p, index, t_uint);
+	index = lb_emit_conv(p, index, t_uintptr);
 
-	if (size == N*sz) {
+	if (size == len*elem_sz) {
 		lbValue elems_ptr = lb_emit_conv(p, cells_ptr, alloc_type_pointer(type));
 		return lb_emit_ptr_offset(p, elems_ptr, index);
 	}
 
 	// TOOD(bill): N power of two optimization to use >> and &
 
-	lbValue N_const = lb_const_int(p->module, index.type, N);
-	lbValue cell_index = lb_emit_arith(p, Token_Quo, index, N_const, index.type);
-	lbValue data_index = lb_emit_arith(p, Token_Mod, index, N_const, index.type);
-	lbValue cell = lb_emit_ptr_offset(p, cells_ptr, cell_index);
-	lbValue elems_ptr = lb_emit_conv(p, cell, alloc_type_pointer(type));
+	lbValue size_const = lb_const_int(p->module, t_uintptr, size);
+	lbValue len_const = lb_const_int(p->module, t_uintptr, len);
+	lbValue cell_index = lb_emit_arith(p, Token_Quo, index, len_const, t_uintptr);
+	lbValue data_index = lb_emit_arith(p, Token_Mod, index, len_const, t_uintptr);
+
+	lbValue elems_ptr = lb_emit_conv(p, cells_ptr, t_uintptr);
+	lbValue cell_offset = lb_emit_arith(p, Token_Mul, size_const, cell_index, t_uintptr);
+	elems_ptr = lb_emit_arith(p, Token_Add, elems_ptr, cell_offset, t_uintptr);
+
+	elems_ptr = lb_emit_conv(p, elems_ptr, alloc_type_pointer(type));
+
 	return lb_emit_ptr_offset(p, elems_ptr, data_index);
 }
 
diff --git a/src/llvm_backend_utility.cpp b/src/llvm_backend_utility.cpp
index a3493f864..6d69021ce 100644
--- a/src/llvm_backend_utility.cpp
+++ b/src/llvm_backend_utility.cpp
@@ -1440,7 +1440,7 @@ lbValue lb_map_len(lbProcedure *p, lbValue value) {
 }
 
 lbValue lb_map_cap(lbProcedure *p, lbValue value) {
-	GB_ASSERT(is_type_map(value.type));
+	GB_ASSERT_MSG(is_type_map(value.type) || are_types_identical(value.type, t_raw_map), "%s", type_to_string(value.type));
 	lbValue zero = lb_const_int(p->module, t_uintptr, 0);
 	lbValue one = lb_const_int(p->module, t_uintptr, 1);
 
@@ -1454,7 +1454,7 @@ lbValue lb_map_cap(lbProcedure *p, lbValue value) {
 }
 
 lbValue lb_map_data_uintptr(lbProcedure *p, lbValue value) {
-	GB_ASSERT(is_type_map(value.type));
+	GB_ASSERT(is_type_map(value.type) || are_types_identical(value.type, t_raw_map));
 	lbValue data = lb_emit_struct_ev(p, value, 0);
 	u64 mask_value = 0;
 	if (build_context.word_size == 4) {
diff --git a/src/main.cpp b/src/main.cpp
index b75137613..3b0a599db 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -638,6 +638,7 @@ enum BuildFlagKind {
 	BuildFlag_StrictStyleInitOnly,
 	BuildFlag_ForeignErrorProcedures,
 	BuildFlag_DisallowRTTI,
+	BuildFlag_UseStaticMapCalls,
 
 	BuildFlag_Compact,
 	BuildFlag_GlobalDefinitions,
@@ -814,6 +815,8 @@ bool parse_build_flags(Array<String> args) {
 
 	add_flag(&build_flags, BuildFlag_DisallowRTTI,            str_lit("disallow-rtti"),             BuildFlagParam_None,    Command__does_check);
 
+	add_flag(&build_flags, BuildFlag_UseStaticMapCalls,       str_lit("use-static-map-calls"),      BuildFlagParam_None,    Command__does_check);
+
 
 	add_flag(&build_flags, BuildFlag_Compact,                 str_lit("compact"),                   BuildFlagParam_None,    Command_query);
 	add_flag(&build_flags, BuildFlag_GlobalDefinitions,       str_lit("global-definitions"),        BuildFlagParam_None,    Command_query);
@@ -1414,6 +1417,9 @@ bool parse_build_flags(Array<String> args) {
 						case BuildFlag_DisallowRTTI:
 							build_context.disallow_rtti = true;
 							break;
+						case BuildFlag_UseStaticMapCalls:
+							build_context.use_static_map_calls = true;
+							break;
 						case BuildFlag_DefaultToNilAllocator:
 							build_context.ODIN_DEFAULT_TO_NIL_ALLOCATOR = true;
 							break;
diff --git a/src/types.cpp b/src/types.cpp
index ab82e87b8..74b192010 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -693,6 +693,7 @@ gb_global Type *t_raw_map_ptr                    = nullptr;
 
 gb_global Type *t_equal_proc  = nullptr;
 gb_global Type *t_hasher_proc = nullptr;
+gb_global Type *t_map_get_proc = nullptr;
 
 gb_global Type *t_objc_object   = nullptr;
 gb_global Type *t_objc_selector = nullptr;