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Full Discussion: Why does this example C code run and yet SHOULD either not compile or give a segmentation fault?
Top Forums Programming Why does this example C code run and yet SHOULD either not compile or give a segmentation fault? Post 303032976 by RudiC on Wednesday 27th of March 2019 05:50:43 PM
Old 03-27-2019
My C days are long gone, and assembler even longer, so I don't have any authority to speak up, but to me it seems clear and logical that no strange behaviour e.g. "segmentation fault" comes up with your above code. One reason amongst others for segmentation faults is stack corruption, which may occur if a function is not left (and tidied up) correctly. But, in above example, the two functions have the same parameter / argument structure (none, to be specific), and identical local variable definitions (namely none), so the (quite complex, generated internally by the compiler) return operation includes the same stack tidying up, resulting in test2() 's return statement leaving behind a clean stack although geared up by test1().


What if you specify a large argument list for one of the functions, and define several local variables? Pls try and report back.


Aside: I'm afraid you're slightly off with your hex locations. The first jump takes off from location 0xEBE, and it lands on 0xEE9, right between the two NOPs, which is exactly where the label definition occurred.
Last edited by RudiC; 03-27-2019 at 06:58 PM..
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT REDHAT

glpushmatrix

GLPUSHMATRIX(3G)														  GLPUSHMATRIX(3G)

NAME

       glPushMatrix, glPopMatrix - push and pop the current matrix stack

C SPECIFICATION

       void glPushMatrix( void )

C SPECIFICATION

       void glPopMatrix( void )

DESCRIPTION

       There  is  a  stack  of	matrices for each of the matrix modes.	In GL_MODELVIEW mode, the stack depth is at least 32.  In the other modes,
       GL_COLOR, const(PROJECTION), and GL_TEXTURE, the depth is at least 2.  The current matrix in any mode is the matrix on the top of the stack
       for that mode.

       glPushMatrix  pushes  the current matrix stack down by one, duplicating the current matrix.  That is, after a glPushMatrix call, the matrix
       on top of the stack is identical to the one below it.

       glPopMatrix pops the current matrix stack, replacing the current matrix with the one below it on the stack.

       Initially, each of the stacks contains one matrix, an identity matrix.

       It is an error to push a full matrix stack, or to pop a matrix stack that contains only a single matrix.  In either case, the error flag is
       set and no other change is made to GL state.

ERRORS

       GL_STACK_OVERFLOW is generated if glPushMatrix is called while the current matrix stack is full.

       GL_STACK_UNDERFLOW is generated if glPopMatrix is called while the current matrix stack contains only a single matrix.

       GL_INVALID_OPERATION  is generated if glPushMatrix or glPopMatrix is executed between the execution of glBegin and the corresponding execu-
       tion of glEnd.

ASSOCIATED GETS

       glGet with argument GL_MATRIX_MODE
       glGet with argument GL_COLOR_MATRIX
       glGet with argument GL_MODELVIEW_MATRIX
       glGet with argument GL_PROJECTION_MATRIX
       glGet with argument GL_TEXTURE_MATRIX
       glGet with argument GL_COLOR_STACK_DEPTH
       glGet with argument GL_MODELVIEW_STACK_DEPTH
       glGet with argument GL_PROJECTION_STACK_DEPTH
       glGet with argument GL_TEXTURE_STACK_DEPTH
       glGet with argument GL_MAX_MODELVIEW_STACK_DEPTH
       glGet with argument GL_MAX_PROJECTION_STACK_DEPTH
       glGet with argument GL_MAX_TEXTURE_STACK_DEPTH

SEE ALSO

       glFrustum(3G),  glLoadIdentity(3G),  glLoadMatrix(3G),  glMatrixMode(3G),   glMultMatrix(3G),   glOrtho(3G),   glRotate(3G),   glScale(3G),
       glTranslate(3G), glViewport(3G)

																  GLPUSHMATRIX(3G)
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