12-07-2009
Using dbx on AIX
Hi,
We are porting a virtual machine application which emits native PowerPC instructions. The instructions are written to the data segment and are then executed, similar to the JIT / hot spot technology used in the Java VM.
The problem is that the AIX debugger (dbx) will not show me stack frames which contain the native code, presumably because they live in the data segment and not the code segment. Does anyone know a way around this? I'm thinking there must be someone out there that has done this because porting the Java VM to AIX would encounter the same issue.
We use xlC_r version 10 to compile and link the (64 bit) app on AIX 5.3.
I would *love* to use gdb instead of dbx to do this, but unfortunately I cannot get any version of gdb to work correctly with 64 bit programs on AIX (gdb does work OK with 32 bit programs).
thanks in advance for any help....
Norm Green
GemStone Systems Inc.
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LEARN ABOUT DEBIAN
pcre16_assign_jit_stack
PCRE_ASSIGN_JIT_STACK(3) Library Functions Manual PCRE_ASSIGN_JIT_STACK(3)
NAME
PCRE - Perl-compatible regular expressions
SYNOPSIS
#include <pcre.h>
void pcre_assign_jit_stack(pcre_extra *extra,
pcre_jit_callback callback, void *data);
void pcre16_assign_jit_stack(pcre16_extra *extra,
pcre16_jit_callback callback, void *data);
DESCRIPTION
This function provides control over the memory used as a stack at runtime by a call to pcre[16]_exec() with a pattern that has been suc-
cessfully compiled with JIT optimization. The arguments are:
extra the data pointer returned by pcre[16]_study()
callback a callback function
data a JIT stack or a value to be passed to the callback
function
If callback is NULL and data is NULL, an internal 32K block on the machine stack is used.
If callback is NULL and data is not NULL, data must be a valid JIT stack, the result of calling pcre[16]_jit_stack_alloc().
If callback not NULL, it is called with data as an argument at the start of matching, in order to set up a JIT stack. If the result is
NULL, the internal 32K stack is used; otherwise the return value must be a valid JIT stack, the result of calling
pcre[16]_jit_stack_alloc().
You may safely assign the same JIT stack to multiple patterns, as long as they are all matched in the same thread. In a multithread appli-
cation, each thread must use its own JIT stack. For more details, see the pcrejit page.
There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.
PCRE_ASSIGN_JIT_STACK(3)