Learn My First Language Frontend with LLVM Tutorial
chapter 2
clang++ -g -O3 implementing-a-parser-and-ast.cpp `llvm-config --cxxflags`
./a.outchapter 3
clang++ -g -O3 code-generation-to-llvm.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core` -o toy
./toychapter 4
clang++ -g adding-jit-and-optimizer-support.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core orcjit native` -O3 -o toy
./toychapter 5
clang++ -g adding-control-flow.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core orcjit native` -O3 -o toy
./toychapter 6
clang++ -g adding-control-flow.cpp ``llvm-config --cxxflags --ldflags --system-libs --libs core orcjit native` -O3 -o toy
./toy自定义操作符示例:
# Logical unary not.
def unary!(v)
if v then
0
else
1;
# Unary negate.
def unary-(v)
0-v;
# Define > with the same precedence as <.
def binary> 10 (LHS RHS)
RHS < LHS;
# Binary logical or, which does not short circuit.
def binary| 5 (LHS RHS)
if LHS then
1
else if RHS then
1
else
0;
# Binary logical and, which does not short circuit.
def binary& 6 (LHS RHS)
if !LHS then
0
else
!!RHS;
# Define = with slightly lower precedence than relationals.
def binary = 9 (LHS RHS)
!(LHS < RHS | LHS > RHS);
# Define ':' for sequencing: as a low-precedence operator that ignores operands
# and just returns the RHS.
def binary : 1 (x y) y;
使用自定义操作符
# Logical unary not.
ready> !1;
ready> Evaluated to 0.000000
ready> !0;
ready> Evaluated to 1.000000
# Binary logical and
ready> 1 & 2;
ready> Evaluated to 1.000000
ready> 1 & 0;
ready> Evaluated to 0.000000
chapter 7
clang++ -g mutable-variables.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core orcjit native` -O3 -o toy
./toy使用变量
ready> var a = 1, b = 2 in (a + b);
ready> Evaluated to 3.000000
def binary : 1 (x y) y;
# Iterative fib.
def fibi(x)
var a = 1, b = 1, c in
(for i = 3, i < x in
c = a + b :
a = b :
b = c) :
b;
# Call it.
fibi(10);
chapter 8
clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs all` -o toy
./toy把在 REPL 输入的代码编译到目标文件
./toy
ready> def average(x y) (x + y) * 0.5;
^D
Wrote output.o
测试目标文件
// test.cpp
#include <iostream>
extern "C" {
double average(double, double);
}
int main() {
std::cout << "average of 3.0 and 4.0: " << average(3.0, 4.0) << std::endl;
}把 test.cpp 链接到 outpue.o, 执行查看结果
clang++ test.cpp output.o -o test
./test
# 输出
Average of 3.0 and 4.0 is 3.5
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