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/*
* Example usage:
* ./sparse-llvm hello.c | llc | as -o hello.o
*/
#include <llvm-c/Core.h>
#include <llvm-c/BitWriter.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include "symbol.h"
#include "expression.h"
#include "linearize.h"
#include "flow.h"
static LLVMTypeRef symbol_type(struct symbol *sym)
{
LLVMTypeRef ret = NULL;
switch (sym->bit_size) {
case -1:
ret = LLVMVoidType();
break;
case 8:
ret = LLVMInt8Type();
break;
case 16:
ret = LLVMInt16Type();
break;
case 32:
ret = LLVMInt32Type();
break;
case 64:
ret = LLVMInt64Type();
break;
default:
die("invalid bit size %d for type %d", sym->bit_size, sym->type);
break;
};
return ret;
}
static LLVMLinkage data_linkage(struct symbol *sym)
{
if (sym->ctype.modifiers & MOD_STATIC)
return LLVMPrivateLinkage;
return LLVMExternalLinkage;
}
static LLVMLinkage function_linkage(struct symbol *sym)
{
if (sym->ctype.modifiers & MOD_STATIC)
return LLVMInternalLinkage;
return LLVMExternalLinkage;
}
static void output_insn(struct instruction *insn)
{
}
static void output_bb(struct basic_block *bb, unsigned long generation)
{
struct instruction *insn;
bb->generation = generation;
FOR_EACH_PTR(bb->insns, insn) {
if (!insn->bb)
continue;
output_insn(insn);
}
END_FOR_EACH_PTR(insn);
}
#define MAX_ARGS 64
static void output_fn(LLVMModuleRef module, struct entrypoint *ep)
{
unsigned long generation = ++bb_generation;
struct symbol *sym = ep->name;
struct symbol *base_type = sym->ctype.base_type;
struct symbol *ret_type = sym->ctype.base_type->ctype.base_type;
LLVMTypeRef arg_types[MAX_ARGS];
struct basic_block *bb;
LLVMValueRef function;
struct symbol *arg;
const char *name;
int nr_args = 0;
FOR_EACH_PTR(base_type->arguments, arg) {
struct symbol *arg_base_type = arg->ctype.base_type;
arg_types[nr_args++] = symbol_type(arg_base_type);
} END_FOR_EACH_PTR(arg);
name = show_ident(sym->ident);
function = LLVMAddFunction(module, name, LLVMFunctionType(symbol_type(ret_type), arg_types, nr_args, 0));
LLVMSetLinkage(function, function_linkage(sym));
unssa(ep);
FOR_EACH_PTR(ep->bbs, bb) {
if (bb->generation == generation)
continue;
output_bb(bb, generation);
}
END_FOR_EACH_PTR(bb);
LLVMBasicBlockRef entry = LLVMAppendBasicBlock(function, "entry");
LLVMBuilderRef builder = LLVMCreateBuilder();
LLVMPositionBuilderAtEnd(builder, entry);
if (ret_type == &void_ctype)
LLVMBuildRetVoid(builder);
else
LLVMBuildRet(builder, LLVMConstInt(symbol_type(ret_type), 0, 1));
}
static int output_data(LLVMModuleRef module, struct symbol *sym)
{
struct expression *initializer = sym->initializer;
unsigned long long initial_value = 0;
LLVMValueRef data;
const char *name;
if (initializer) {
if (initializer->type == EXPR_VALUE)
initial_value = initializer->value;
else
assert(0);
}
name = show_ident(sym->ident);
data = LLVMAddGlobal(module, symbol_type(sym->ctype.base_type), name);
LLVMSetLinkage(data, data_linkage(sym));
LLVMSetInitializer(data, LLVMConstInt(symbol_type(sym), initial_value, 1));
return 0;
}
static int compile(LLVMModuleRef module, struct symbol_list *list)
{
struct symbol *sym;
FOR_EACH_PTR(list, sym) {
struct entrypoint *ep;
expand_symbol(sym);
ep = linearize_symbol(sym);
if (ep)
output_fn(module, ep);
else
output_data(module, sym);
}
END_FOR_EACH_PTR(sym);
return 0;
}
int main(int argc, char **argv)
{
struct string_list * filelist = NULL;
char *file;
LLVMModuleRef module = LLVMModuleCreateWithName("sparse");
compile(module, sparse_initialize(argc, argv, &filelist));
FOR_EACH_PTR_NOTAG(filelist, file) {
compile(module, sparse(file));
} END_FOR_EACH_PTR_NOTAG(file);
#if 1
LLVMWriteBitcodeToFD(module, STDOUT_FILENO, 0, 0);
#else
LLVMDumpModule(module);
#endif
LLVMDisposeModule(module);
return 0;
}
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