Crudely bolt on mcgg to mcg itself.

mach/proto/mcg/build.lua

@@ -1,3 +1,5 @@
+include("util/mcgg/build.lua")
+
 normalrule {
 	name = "ircodes",
 	outleaves = { "ircodes.h", "ircodes.c" },
@@ -10,10 +12,16 @@ normalrule {
 	}
 }
 
+mcgg {
+	name = "mcgg_c",
+	srcs = { "./table" }
+}
+
 cprogram {
 	name = "mcg",
 	srcs = {
 		"./*.c",
+		"+mcgg_c",
 		matching(filenamesof("+ircodes"), "%.c$")
 	},
 	deps = {
@@ -28,7 +36,6 @@ cprogram {
 		"modules/src/string+lib",
 		"modules/src/system+lib",
 		"./*.h",
-		"util/mcgg+mcgg",
 	},
 	vars = {
 		["+cflags"] = {

mach/proto/mcg/mcgg_generated_header.h

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#define TRACE
+
+#define STATE_TYPE void*
+typedef struct tree {
+	int op;
+	struct tree *kids[2];
+	STATE_TYPE state_label;
+} *NODEPTR_TYPE;
+#define OP_LABEL(p) ((p)->op)
+#define LEFT_CHILD(p) ((p)->kids[0])
+#define RIGHT_CHILD(p) ((p)->kids[1])
+#define STATE_LABEL(p) ((p)->state_label)
+#define PANIC printf
+
+static void burm_trace(NODEPTR_TYPE p, int eruleno, int cost, int bestcost) {
+#ifdef TRACE
+	extern const char *burm_string[];
+
+	fprintf(stderr, "0x%p matched %s with cost %d vs. %d\n", p,
+		burm_string[eruleno], cost, bestcost);
+#endif
+}
+
+#define burm_assert(b, s) assert(b && s)
+

mach/proto/mcg/table

@@ -0,0 +1,86 @@
+%{
+#if 0
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#define TRACE
+
+#define STATE_TYPE void*
+typedef struct tree {
+	int op;
+	struct tree *kids[2];
+	STATE_TYPE state_label;
+} *NODEPTR_TYPE;
+#define OP_LABEL(p) ((p)->op)
+#define LEFT_CHILD(p) ((p)->kids[0])
+#define RIGHT_CHILD(p) ((p)->kids[1])
+#define STATE_LABEL(p) ((p)->state_label)
+#define PANIC printf
+
+static void burm_trace(NODEPTR_TYPE p, int eruleno, int cost, int bestcost) {
+#ifdef TRACE
+	extern const char *burm_string[];
+
+	fprintf(stderr, "0x%p matched %s with cost %d vs. %d\n", p,
+		burm_string[eruleno], cost, bestcost);
+#endif
+}
+#endif
+%}
+%term LOAD STORE LABEL CONST ADD FOO BAR BAZ BOO;
+%%
+
+	stm = STORE(addr:address, value:reg)
+		ins value:GPR
+		emit "str %value, %addr"
+		cost 4;
+
+	reg = LOAD(addr:address)
+		outs dest:ANY
+		emit "ld %dest, %addr"
+		cost 4;
+
+	address = ADD(addr:reg, offset:CONST)
+		ins addr:GPR
+		fragment "[%addr, #%offset.ivalue]";
+
+	address = addr:reg
+		ins addr:GPR
+		fragment "[%addr]";
+
+	stm = reg;
+
+	reg = ADD(left:reg, right:aluparam)
+		ins left:GPR, right:GPR
+		outs out:GPR
+		emit "add %out, %left, %right"
+		cost 4;
+
+	reg = ADD(left:aluparam, right:reg)
+		ins left:GPR, right:GPR
+		outs out:GPR
+		emit "add %out, %right, %left"
+		cost 4;
+
+	aluparam = value:CONST
+		when { return false; }
+		fragment "#%value.ivalue";
+
+	aluparam = reg;
+
+	reg = value:aluparam
+		outs out:GPR
+		emit "mov %out, %value"
+		cost 4;
+
+	reg = value:LABEL
+		outs out:GPR
+		emit "adr %out, #value.lvalue"
+		cost 4;
+
+	reg = value:CONST
+		outs out:GPR
+		emit "ldr %out, #value.lvalue"
+		cost 4;

util/mcgg/build.lua

@@ -22,4 +22,38 @@ cprogram {
 		"+yacc"
 	}
 }
+	
+definerule("mcgg",
+	{
+		srcs = { type="targets" }
+	},
+	function(e)
+		-- Remember this is executed from the caller's directory; local
+		-- target names will resolve there
+		if (#e.srcs ~= 1) then
+			error("you must supply exactly one input file")
+		end
+
+		local cpptable = cppfile {
+			name = e.name.."/cpptable",
+			outleaf = "cpptable",
+			srcs = e.srcs
+		}
+
+		return normalrule {
+			name = e.name,
+			cwd = e.cwd,
+			outleaves = {
+				"tables.c",
+			},
+			ins = {
+				"util/mcgg+mcgg",
+				cpptable
+			},
+			commands = {
+				"%{ins[1]} < %{ins[2]} > %{outs}",
+			}
+		}
+	end
+)
 

util/mcgg/iburg.c

@@ -73,6 +73,8 @@ int main(int argc, char* argv[])
 	infp = stdin;
 	outfp = stdout;
 
+	emitheader();
+
 	yyin = infp;
 	yyparse();
 
@@ -81,7 +83,7 @@ int main(int argc, char* argv[])
 	for (p = nts; p; p = p->link)
 		if (!p->reached)
 			yyerror("can't reach non-terminal `%s'\n", p->name);
-	emitheader();
+
 	emitdefs(nts, ntnumber);
 	emitstruct(nts, ntnumber);
 	emitnts(rules, nrules);
@@ -524,10 +526,7 @@ static void emitfuncs(void)
 /* emitheader - emit initial definitions */
 static void emitheader(void)
 {
-	print("#include <limits.h>\n#include <stdlib.h>\n");
-	print("#ifndef STATE_TYPE\n#define STATE_TYPE int\n#endif\n");
-	print("#ifndef ALLOC\n#define ALLOC(n) malloc(n)\n#endif\n"
-	      "#ifndef %Passert\n#define %Passert(x,y) if (!(x)) { y; abort(); }\n#endif\n\n");
+	print("#include \"mcgg_generated_header.h\"\n");
 	if (Tflag)
 		print("static NODEPTR_TYPE %Pnp;\n\n");
 }
@@ -752,8 +751,7 @@ static void emitstate(Term terms, Nonterm start, int ntnumber)
 	      "%1struct %Pstate* r = (struct %Pstate *)right;\n"
 		  "\n"
 		  "%1assert(sizeof (STATE_TYPE) >= sizeof (void *));\n%1");
-	print("%1p = ALLOC(sizeof *p);\n"
-	      "%1%Passert(p, PANIC(\"ALLOC returned NULL in %Pstate\\n\"));\n"
+	print("%1p = malloc(sizeof *p);\n"
 	      "%1p->op = op;\n"
 		  "%1p->left = l;\n"
 		  "%1p->right = r;\n"