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/**************************************************************************
*
* Copyright 2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include <stdio.h>
#include "lp_bld_printf.h"
static int
lp_get_printf_arg_count(const char *fmt)
{
int count =0;
const char *p = fmt;
int c;
while ((c = *p++)) {
if (c != '%')
continue;
switch (*p) {
case '\0':
continue;
case '%':
p++;
continue;
case '.':
if (p[1] == '*' && p[2] == 's') {
count += 2;
p += 3;
continue;
}
default:
count ++;
}
}
return count;
}
LLVMValueRef
lp_build_const_string_variable(LLVMModuleRef module, const char *str, int len)
{
LLVMValueRef string = LLVMAddGlobal(module, LLVMArrayType(LLVMInt8Type(), len + 1), "");
LLVMSetGlobalConstant(string, TRUE);
LLVMSetLinkage(string, LLVMInternalLinkage);
LLVMSetInitializer(string, LLVMConstString(str, len + 1, TRUE));
return string;
}
/**
* lp_build_printf.
*
* Build printf call in LLVM IR. The output goes to stdout.
* The additional variable arguments need to have type
* LLVMValueRef.
*/
LLVMValueRef
lp_build_printf(LLVMBuilderRef builder, const char *fmt, ...)
{
va_list arglist;
int i = 0;
int argcount = lp_get_printf_arg_count(fmt);
LLVMModuleRef module = LLVMGetGlobalParent(LLVMGetBasicBlockParent(LLVMGetInsertBlock(builder)));
LLVMValueRef params[argcount + 1];
LLVMValueRef fmtarg = lp_build_const_string_variable(module, fmt, strlen(fmt) + 1);
LLVMValueRef int0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
LLVMValueRef index[2];
LLVMValueRef func_printf = LLVMGetNamedFunction(module, "printf");
index[0] = index[1] = int0;
if (!func_printf) {
LLVMTypeRef printf_type = LLVMFunctionType(LLVMIntType(32), NULL, 0, 1);
func_printf = LLVMAddFunction(module, "printf", printf_type);
}
params[0] = LLVMBuildGEP(builder, fmtarg, index, 2, "");
va_start(arglist, fmt);
for (i = 1; i <= argcount; i++)
params[i] = va_arg(arglist, LLVMValueRef);
va_end(arglist);
return LLVMBuildCall(builder, func_printf, params, argcount + 1, "");
}
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