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Multi string and multi program support

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varun-r-mallya
2025-09-07 20:41:41 +05:30
parent d52b9ceb69
commit 7e47f8dcef
4 changed files with 13 additions and 13 deletions
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18
pythonbpf/bpf_helper_handler.py
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@ -2,13 +2,17 @@ import ast
from llvmlite import ir
def bpf_printk_emitter(call, module, builder, func):
# Handle print statement
if not hasattr(func, "_fmt_counter"):
func._fmt_counter = 0
for arg in call.args:
if isinstance(arg, ast.Constant) and isinstance(arg.value, str):
fmt_str = arg.value + "\n" + "\0"
# Create a global variable for the format string
fmt_name = f"{func.name}____fmt{func._fmt_counter}"
func._fmt_counter += 1
fmt_gvar = ir.GlobalVariable(
module, ir.ArrayType(ir.IntType(8), len(fmt_str)), name=f"{func.name}____fmt")
module, ir.ArrayType(ir.IntType(8), len(fmt_str)), name=fmt_name)
fmt_gvar.global_constant = True
fmt_gvar.initializer = ir.Constant( # type: ignore
ir.ArrayType(ir.IntType(8), len(fmt_str)),
@ -17,17 +21,13 @@ def bpf_printk_emitter(call, module, builder, func):
fmt_gvar.linkage = "internal"
fmt_gvar.align = 1 # type: ignore
# Cast the global variable to i8*
fmt_ptr = builder.bitcast(
fmt_gvar, ir.PointerType())
fmt_ptr = builder.bitcast(fmt_gvar, ir.PointerType())
# Call bpf_trace_printk (assumed to be at address 6)
fn_type = ir.FunctionType(ir.IntType(
64), [ir.PointerType(), ir.IntType(32)], var_arg=True)
fn_ptr_type = ir.PointerType(fn_type)
fn_addr = ir.Constant(ir.IntType(64), 6)
fn_ptr = builder.inttoptr(fn_addr, fn_ptr_type)
# Call the function
builder.call(fn_ptr, [fmt_ptr, ir.Constant(
ir.IntType(32), len(fmt_str))], tail=True)
ir.IntType(32), len(fmt_str))], tail=True)