🚀 go-pugleaf

Sun4/330, SunOS 4.0.3, latest version of g++-1.36.2

Michael,

Here is a short piece of code, it's compilation and execution, and the
assembler produced for the code.

The code calculates the size of an array of objects, and creates the array.
The bug is that the array is not created (nor destroyed).  This was not
any easy one to track down--naturally the program didn't just die
immediately nor consistently...things are never that easy...

Thanks,
rob collins
rjc@cs.ucla.edu


Script started on Sun Jan  7 18:39:08 1990
pollux% cat a.cc
#include <stdio.h>

class foo {
  private:
    int i;
  public:
    foo(int i = 1);
    ~foo();
};

foo::foo(int init) : i(init) { printf("constructing foo\n"); }
foo::~foo() { printf("destructing foo\n"); }

void bar(const float, const unsigned);

main()
{
    bar(5.3, 1);
}

void bar(const float r, unsigned i)
{
    unsigned n = (unsigned) (r * (float) i);
    foo k[n];
}
    
pollux% g++ -v a.cc
g++ version 1.36.2 (based on GCC 1.36)
 /usr/local/lib/gcc-cpp -+ -v -undef -D__GNUC__ -D__GNUG__ -D__cplusplus -Dsparc -Dsun -Dunix -D__sparc__ -D__sun__ -D__unix__ a.cc /usr/tmp/cca01001.cpp
GNU CPP version 1.36.91
 /usr/local/lib/gcc-cc1plus /usr/tmp/cca01001.cpp -quiet -dumpbase a.cc -version -o /usr/tmp/cca01001.s
GNU C++ version 1.36.2 (based on GCC 1.36) (sparc) compiled by GNU C version 1.36.
default target switches: -mfpu -mepilogue
 /usr/local/lib/gcc-as -o a.o /usr/tmp/cca01001.s
 /usr/local/lib/gcc-ld -e start -dc -dp /lib/crt0.o a.o -lg++ /usr/local/lib/gcc-gnulib -lc
pollux% a.out
pollux% g++ -S a.cc
pollux% cat a.s
gcc_compiled.:
.text
LC0:
	.ascii "constructing foo\12\0"
	.align 4
.global ___3fooi
	.proc 1
___3fooi:
	!#PROLOGUE# 0
	save %sp,-112,%sp
	!#PROLOGUE# 1
	mov %i0,%l0
	st %i1,[%fp+72]
	ld [%fp+72],%o1
	st %o1,[%l0]
	sethi %hi(LC0),%o0
	or %lo(LC0),%o0,%o0
	call _printf,0
	nop
	mov %l0,%i0
L1:
	ret
	restore
LC1:
	.ascii "destructing foo\12\0"
	.align 4
.global __$_foo
	.proc 1
__$_foo:
	!#PROLOGUE# 0
	save %sp,-112,%sp
	!#PROLOGUE# 1
	mov %i0,%l0
	st %i1,[%fp+72]
	sethi %hi(LC1),%o0
	or %lo(LC1),%o0,%o0
	call _printf,0
	nop
L3:
	ld [%fp+72],%o0
	tst %o0
	be L4
	nop
	mov %l0,%o0
	call ___builtin_delete,0
	nop
	b L5
	nop
L4:
L5:
L2:
	ret
	restore
	.align 4
LC2:
	.single 0r5.29999999999999982236e+00
	.align 4
.global _main
	.proc 1
_main:
	!#PROLOGUE# 0
	save %sp,-112,%sp
	!#PROLOGUE# 1
	call ___main,0
	nop
	mov %o0,%o0
	sethi %hi(LC2),%g1
	ld [%g1+%lo(LC2)],%o0
	mov 1,%o1
	call _bar__FfUi,0
	nop
	mov 0,%i0
	b L6
	nop
L6:
	ret
	restore
	.align 4
LC3:
	.single 0r4.29496729600000000000e+09
	.align 4
.global _bar__FfUi
	.proc 1
_bar__FfUi:
	!#PROLOGUE# 0
	save %sp,-120,%sp
	!#PROLOGUE# 1
	st %g0,[%fp-16]
	st %g0,[%fp-12]
	st %i0,[%fp+68]
	st %i1,[%fp+72]
	ld [%fp+72],%f2
	fitos %f2,%f2
	ld [%fp-16],%f0
	fcmpes %f2,%f0
	nop
	fbge L8
	nop
	sethi %hi(LC3),%g1
	ld [%g1+%lo(LC3)],%f3
	fadds %f2,%f3,%f2
L8:
	ld [%fp+68],%f3
	fmuls %f2,%f3,%f2
	fstod %f2,%f2
	std %f2,[%fp-8]
	ldd [%fp-8],%o0
	call ___fixunsdfsi,0
	nop
	st %o0,[%fp-20]
	ld [%fp-20],%o0
	sll %o0,2,%l0
	mov %sp,%l1
	mov %l0,%o0
	add %o0,7,%o1
	srl %o1,3,%o0
	sll %o0,3,%o0
	sub %sp,%o0,%sp
	mov %sp,%l2
	add %l2,92,%l2
	mov 0,%l3
	mov %l2,%l3
	mov %l2,%l4
	ld [%fp-20],%o0
	add %o0,-1,%l5
	tst %l5
	bl L9
	nop
L10:
	mov %l4,%o0
	mov 1,%o1
	call ___3fooi,0
	nop
	add %l4,4,%l4
L12:
	add %l5,-1,%l5
	cmp %l5,-1
	be L11
	nop
	b L10
	nop
L11:
L9:
	ld [%fp-20],%o0
	add %o0,-1,%l6
	tst %l6
	bl L13
	nop
	ld [%fp-20],%o0
	add %o0,-1,%o0
	add %o0,1,%o0
	sll %o0,2,%o0
	add %l2,%o0,%l7
L14:
	add %l7,-4,%l7
	tst %l7
	be L17
	nop
	mov %l7,%o0
	mov 0,%o1
	call __$_foo,0
	nop
	b L18
	nop
L17:
L18:
L16:
	add %l6,-1,%l6
	cmp %l6,-1
	be L15
	nop
	b L14
	nop
L15:
L13:
	mov %l1,%sp
L7:
	ret
	restore
pollux% 
script done on Sun Jan  7 18:40:21 1990