start ducc project

7 files changed, 20 insertions, 54 deletions

diff --git a/.gitignore b/.gitignore
index a02831a..d821e9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 /main*.s
-/p4dcc*
+/ducc*
 /tests/tmp
diff --git a/README.md b/README.md
index e1298a5..6ead681 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,6 @@
-# P4Dcc
+# Ducc
 
-P4Dcc is a tiny, but self-hosted C compiler. It takes C source code and compiles it to assembly language. For assembling and linking, it deletegates to gcc as-is.
-
-This project was started to prove the hypothesis: "Could a self-hostable C compiler be built in four days, if the feature set is carefully limited?" - "P4D" stands for the ISO 8601 notation meaning "four days." However, I actually completed the project by the morning of the third day.
-
-The code is written following the instructions at https://www.sigbus.info/compilerbook, and several key design decisions were inspired by the book.
+Ducc is a toy C compiler, based on [my another tiny C compiler](https://github.com/nsfisis/P4Dcc).
 
 
 ## Dependencies
@@ -24,39 +20,9 @@ $ just build
 
 ```
 $ just test
-$ just test-all  # test all things, including binary equiality between generations
 ```
 
 
-## Design
-
-To meet the four-day goal, many design decisions were made to reduce complexity (ideas directly taken from https://www.sigbus.info/compilerbook are not listed):
-
-* Simplified declaration syntax
-    * No support for `typedef`
-        * Structs always begin with `struct` keyword
-    * No support for array types
-        * No stack-allocated arrays
-        * All arrays are heap-allocated and accessed via pointers
-    * No support for function types
-    * Type information always precede the variable name
-* Minimal syntax sugar
-    * ~~No increment/decrement operators~~
-        * Partially implemented after self-hosting
-    * ~~No compound assignment operators~~
-        * Implemented after self-hosting
-    * ~~No `while`~~
-        * Implemented after self-hosting
-    * No `switch`
-* Limited preprocessor
-    * Supports only simple `#define` that replaces identifiers with single integer or identifier
-* No global variables
-    * Including `stdin`, `stdout`, and `stderr`
-    * Only function/struct definitions/declarations are allowed at the top level
-* No variable shadowing
-    * All variables are function-scoped
-
-
 ## License
 
 See [LICENSE](./LICENSE).
diff --git a/justfile b/justfile
index 24add55..b0b6115 100644
--- a/justfile
+++ b/justfile
@@ -5,15 +5,15 @@ all: build
 build N="1":
     #!/usr/bin/env bash
     if [[ {{N}} = 1 ]]; then
-        gcc -g -O0 -o p4dcc main.c {{CFLAGS}}
+        gcc -g -O0 -o ducc main.c {{CFLAGS}}
     else
         if [[ {{N}} = 2 ]]; then
             prev=""
         else
             prev=$(({{N}} - 1))
         fi
-        "./p4dcc${prev}" < main.c > main{{N}}.s
-        gcc -s -Wl,-z,noexecstack -o p4dcc{{N}} main{{N}}.s
+        "./ducc${prev}" < main.c > main{{N}}.s
+        gcc -s -Wl,-z,noexecstack -o ducc{{N}} main{{N}}.s
     fi
 
 build-upto-5-gen:
@@ -24,11 +24,11 @@ build-upto-5-gen:
     just build 5
 
 test-self-hosted: build-upto-5-gen
-    diff -u ./p4dcc2 ./p4dcc3
-    diff -u ./p4dcc3 ./p4dcc4
-    diff -u ./p4dcc4 ./p4dcc5
+    diff -u ./ducc2 ./ducc3
+    diff -u ./ducc3 ./ducc4
+    diff -u ./ducc4 ./ducc5
 
-test TESTCASE="all" $BIN="p4dcc": build
+test TESTCASE="all" $BIN="ducc": build
     #!/usr/bin/env bash
     if [[ {{TESTCASE}} = all ]]; then
         bash tests/all.sh
@@ -38,13 +38,13 @@ test TESTCASE="all" $BIN="p4dcc": build
 
 test-all:
     just test-self-hosted
-    just test all p4dcc
-    just test all p4dcc2
-    just test all p4dcc3
-    just test all p4dcc4
-    just test all p4dcc5
+    just test all ducc
+    just test all ducc2
+    just test all ducc3
+    just test all ducc4
+    just test all ducc5
 
 clean:
     rm -f main*.s
-    rm -f p4dcc*
+    rm -f ducc*
     rm -rf tests/tmp
diff --git a/tests/run.sh b/tests/run.sh
index 2a5d9be..0e28a96 100644
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -1,6 +1,6 @@
 set -e
 
-export p4dcc="../../../$BIN"
+export ducc="../../../$BIN"
 
 export testcase=$1
 export tmp_dir="tests/tmp/$testcase"
diff --git a/tests/test_diff.sh b/tests/test_diff.sh
index 44e00d0..ec0f1d0 100644
--- a/tests/test_diff.sh
+++ b/tests/test_diff.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$p4dcc" < main.c > main.s
+"$ducc" < main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1
diff --git a/tests/test_exit_code.sh b/tests/test_exit_code.sh
index f49d468..490de5b 100644
--- a/tests/test_exit_code.sh
+++ b/tests/test_exit_code.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$p4dcc" < main.c > main.s
+"$ducc" < main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1
diff --git a/tests/test_output.sh b/tests/test_output.sh
index 2c8fb29..2f8b984 100644
--- a/tests/test_output.sh
+++ b/tests/test_output.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$p4dcc" < main.c > main.s
+"$ducc" < main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1