紧急堆栈跟踪：如何将值映射到函数的参数？

Question

Looking at the last line there ".Number(..."

Is it possible to discern the arguments to the method Number() from those hex numbers?

It would be a help, without hitting the debugger too often.

panic: runtime error: index out of range

goroutine 19 [running]:
testing.tRunner.func1(0xc042046340)
    C:/Go/src/testing/testing.go:622 +0x2a4
panic(0x523e20, 0x5df810)
    C:/Go/src/runtime/panic.go:489 +0x2dd
util.(*NumberEngine).Number(0xc042066150, 0xf4698, 0xa, 0xc042b2a870, 0xa)

edit: including the full signature of method

func (fe *NumberEngine) Number(num int) Number {

edit: including the definition of Number

type Power struct{ Prime, Exp int }
type Number []Power

Answer 1

In the "reference" implementation (that one, dubbed gc and available for download at https://golang.org):

• The first argument to a method is the method's receiver.

  In your case it's a pointer receiver, so 0xc042066150 is the address of that NumberEngine instance in memory.

• All the arguments are passed on the stack — from left to right.

  • The fields of compound types such as structs appear in the order they are defined in the type.
  • strings and slices are compound types — of two and three fields each, respectively: pointer + length and pointer + length + capacity.

For more info, we need the signature of the util.(*NumberEngine).Number method, and the definitions of any custom types it uses, if any.