Handle Allocator_Error correctly in core:math/big

Author: gingerBill

core/math/big/common.odin

@@ -6,6 +6,7 @@ package math_big
 */
 
 import "base:intrinsics"
+import "base:runtime"
 
 /*
 	TODO: Make the tunables runtime adjustable where practical.
@@ -138,11 +139,12 @@ Flags :: bit_set[Flag; u8]
 /*
 	Errors are a strict superset of runtime.Allocation_Error.
 */
-Error :: enum int {
-	Okay                    = 0,
+Error :: enum byte {
+	None                    = 0,
 	Out_Of_Memory           = 1,
 	Invalid_Pointer         = 2,
 	Invalid_Argument        = 3,
+	Mode_Not_Implemented    = 4, // Allocation
 
 	Assignment_To_Immutable = 10,
 	Max_Iterations_Reached  = 11,
@@ -160,11 +162,15 @@ Error :: enum int {
 	Unimplemented           = 127,
 }
 
+#assert(intrinsics.type_is_superset_of(Error, runtime.Allocator_Error))
+
+
 Error_String :: #sparse[Error]string{
-	.Okay                    = "Okay",
+	.None                    = "None",
 	.Out_Of_Memory           = "Out of memory",
 	.Invalid_Pointer         = "Invalid pointer",
 	.Invalid_Argument        = "Invalid argument",
+	.Mode_Not_Implemented    = "Allocation mode not implemented",
 
 	.Assignment_To_Immutable = "Assignment to immutable",
 	.Max_Iterations_Reached  = "Max iterations reached",

core/math/big/internal.odin

@@ -2177,7 +2177,11 @@ internal_int_grow :: proc(a: ^Int, digits: int, allow_shrink := false, allocator
 		If not yet initialized, initialize the `digit` backing with the allocator we were passed.
 	*/
 	if cap == 0 {
-		a.digit = make([dynamic]DIGIT, needed, allocator)
+		mem_err: mem.Allocator_Error
+		a.digit, mem_err = make([dynamic]DIGIT, needed, allocator)
+		if mem_err != nil {
+			return cast(Error)mem_err
+		}
 	} else if cap < needed {
 		/*
 			`[dynamic]DIGIT` already knows what allocator was used for it, so resize will do the right thing.

core/math/big/radix.odin

@@ -44,7 +44,11 @@ int_itoa_string :: proc(a: ^Int, radix := i8(10), zero_terminate := false, alloc
 	/*
 		Allocate the buffer we need.
 	*/
-	buffer := make([]u8, size)
+	buffer, mem_err := make([]u8, size)
+	if mem_err != nil {
+		err = cast(Error)mem_err
+		return
+	}
 
 	/*
 		Write the digits out into the buffer.