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/**************************************************************************
*
* Copyright 2009 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.
*
**************************************************************************/
/**
* LLVM control flow build helpers.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_FLOW_H
#define LP_BLD_FLOW_H
#include "gallivm/lp_bld.h"
struct lp_type;
/**
* Early exit. Useful to skip to the end of a function or block when
* the execution mask becomes zero or when there is an error condition.
*/
struct lp_build_skip_context
{
struct gallivm_state *gallivm;
/** Block to skip to */
LLVMBasicBlockRef block;
};
void
lp_build_flow_skip_begin(struct lp_build_skip_context *ctx,
struct gallivm_state *gallivm);
void
lp_build_flow_skip_cond_break(struct lp_build_skip_context *ctx,
LLVMValueRef cond);
void
lp_build_flow_skip_end(struct lp_build_skip_context *ctx);
struct lp_build_mask_context
{
struct lp_build_skip_context skip;
LLVMTypeRef reg_type;
LLVMValueRef var;
};
void
lp_build_mask_begin(struct lp_build_mask_context *mask,
struct gallivm_state *gallivm,
struct lp_type type,
LLVMValueRef value);
LLVMValueRef
lp_build_mask_value(struct lp_build_mask_context *mask);
/**
* Bitwise AND the mask with the given value, if a previous mask was set.
*/
void
lp_build_mask_update(struct lp_build_mask_context *mask,
LLVMValueRef value);
void
lp_build_mask_check(struct lp_build_mask_context *mask);
LLVMValueRef
lp_build_mask_end(struct lp_build_mask_context *mask);
/**
* LLVM's IR doesn't represent for-loops directly. Furthermore it
* it requires creating code blocks, branches, phi variables, so it
* requires a fair amount of code.
*
* @sa http://www.llvm.org/docs/tutorial/LangImpl5.html#for
*/
struct lp_build_loop_state
{
LLVMBasicBlockRef block;
LLVMValueRef counter_var;
LLVMValueRef counter;
struct gallivm_state *gallivm;
};
void
lp_build_loop_begin(struct lp_build_loop_state *state,
struct gallivm_state *gallivm,
LLVMValueRef start);
void
lp_build_loop_end(struct lp_build_loop_state *state,
LLVMValueRef end,
LLVMValueRef step);
void
lp_build_loop_end_cond(struct lp_build_loop_state *state,
LLVMValueRef end,
LLVMValueRef step,
LLVMIntPredicate cond);
/**
* if/else/endif.
*/
struct lp_build_if_state
{
struct gallivm_state *gallivm;
LLVMValueRef condition;
LLVMBasicBlockRef entry_block;
LLVMBasicBlockRef true_block;
LLVMBasicBlockRef false_block;
LLVMBasicBlockRef merge_block;
};
void
lp_build_if(struct lp_build_if_state *ctx,
struct gallivm_state *gallivm,
LLVMValueRef condition);
void
lp_build_else(struct lp_build_if_state *ctx);
void
lp_build_endif(struct lp_build_if_state *ctx);
LLVMBasicBlockRef
lp_build_insert_new_block(struct gallivm_state *gallivm, const char *name);
LLVMValueRef
lp_build_alloca(struct gallivm_state *gallivm,
LLVMTypeRef type,
const char *name);
LLVMValueRef
lp_build_array_alloca(struct gallivm_state *gallivm,
LLVMTypeRef type,
LLVMValueRef count,
const char *name);
#endif /* !LP_BLD_FLOW_H */
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