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|
/*===-- calc.c - tool for testing libLLVM and llvm-c API ------------------===*\
|* *|
|* Part of the LLVM Project, under the Apache License v2.0 with LLVM *|
|* Exceptions. *|
|* See https://llvm.org/LICENSE.txt for license information. *|
|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception *|
|* *|
|*===----------------------------------------------------------------------===*|
|* *|
|* This file implements the --calc command in llvm-c-test. --calc reads lines *|
|* from stdin, parses them as a name and an expression in reverse polish *|
|* notation and prints a module with a function with the expression. *|
|* *|
\*===----------------------------------------------------------------------===*/
#include "llvm-c-test.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
typedef LLVMValueRef (*binop_func_t)(LLVMBuilderRef, LLVMValueRef LHS,
LLVMValueRef RHS, const char *Name);
static LLVMOpcode op_to_opcode(char op) {
switch (op) {
case '+': return LLVMAdd;
case '-': return LLVMSub;
case '*': return LLVMMul;
case '/': return LLVMSDiv;
case '&': return LLVMAnd;
case '|': return LLVMOr;
case '^': return LLVMXor;
}
assert(0 && "unknown operation");
return 0;
}
#define MAX_DEPTH 32
static LLVMValueRef build_from_tokens(char **tokens, int ntokens,
LLVMBuilderRef builder,
LLVMValueRef param) {
LLVMValueRef stack[MAX_DEPTH];
int depth = 0;
int i;
for (i = 0; i < ntokens; i++) {
char tok = tokens[i][0];
switch (tok) {
case '+':
case '-':
case '*':
case '/':
case '&':
case '|':
case '^':
if (depth < 2) {
printf("stack underflow\n");
return NULL;
}
stack[depth - 2] = LLVMBuildBinOp(builder, op_to_opcode(tok),
stack[depth - 1], stack[depth - 2], "");
depth--;
break;
case '@': {
LLVMValueRef off;
if (depth < 1) {
printf("stack underflow\n");
return NULL;
}
LLVMTypeRef ty = LLVMInt64Type();
off = LLVMBuildGEP2(builder, ty, param, &stack[depth - 1], 1, "");
stack[depth - 1] = LLVMBuildLoad2(builder, ty, off, "");
break;
}
default: {
char *end;
long val = strtol(tokens[i], &end, 0);
if (end[0] != '\0') {
printf("error parsing number\n");
return NULL;
}
if (depth >= MAX_DEPTH) {
printf("stack overflow\n");
return NULL;
}
stack[depth++] = LLVMConstInt(LLVMInt64Type(), val, 1);
break;
}
}
}
if (depth < 1) {
printf("stack underflow at return\n");
return NULL;
}
LLVMBuildRet(builder, stack[depth - 1]);
return stack[depth - 1];
}
static void handle_line(char **tokens, int ntokens) {
char *name = tokens[0];
LLVMValueRef param;
LLVMValueRef res;
LLVMModuleRef M = LLVMModuleCreateWithName(name);
LLVMTypeRef I64ty = LLVMInt64Type();
LLVMTypeRef I64Ptrty = LLVMPointerType(I64ty, 0);
LLVMTypeRef Fty = LLVMFunctionType(I64ty, &I64Ptrty, 1, 0);
LLVMValueRef F = LLVMAddFunction(M, name, Fty);
LLVMBuilderRef builder = LLVMCreateBuilder();
LLVMPositionBuilderAtEnd(builder, LLVMAppendBasicBlock(F, "entry"));
LLVMGetParams(F, ¶m);
LLVMSetValueName(param, "in");
res = build_from_tokens(tokens + 1, ntokens - 1, builder, param);
if (res) {
char *irstr = LLVMPrintModuleToString(M);
puts(irstr);
LLVMDisposeMessage(irstr);
}
LLVMDisposeBuilder(builder);
LLVMDisposeModule(M);
}
int llvm_calc(void) {
llvm_tokenize_stdin(handle_line);
return 0;
}
|
