starting work on codegen, need to work on reg allocation to progress

include/gravity/core.h

@@ -28,7 +28,10 @@ GravityBuilder gravityCreateBuilder(void);
 GravityFunction gravityNewFunction(GravityModule module, const char* name, GravityType functionType);
 GravityBlock gravityStartBlock(const char* name, GravityFunction function);
 
+int gravityGetTypeSize(GravityType type);
+
 GravityValue gravityBuildIntConstant(GravityBuilder builder, GravityType intType, int64_t value, const char* name);
+GravityValue gravityNewIntConstant(GravityType intType, int64_t value);
 
 GravityType gravityCreateFunctionType(int numArgs, GravityType* argTypes, GravityType returnType);
 GravityType gravityCreateIntegerType(uint8_t width, bool isSigned);

src/generators/arch/x86_64.c

@@ -16,45 +16,83 @@ void emitValue(GravityTargetArch self, GravityValue value) {
         }
 
         case GravityLocalValueKind: {
+            GravityVarSlot* slot;
+            HASH_FIND(hh, self->vars, value, sizeof(void*), slot);
+            assert(slot != NULL);
 
+            switch (slot->sizeBytes) {
+                case 1: sbAppend(self->outputBuffer, "byte [rbp - %d]", slot->stackPos + slot->sizeBytes); break;
+                case 2: sbAppend(self->outputBuffer, "word [rbp - %d]", slot->stackPos + slot->sizeBytes); break;
+                case 4: sbAppend(self->outputBuffer, "dword [rbp - %d]", slot->stackPos + slot->sizeBytes); break;
+                case 8: sbAppend(self->outputBuffer, "qword [rbp - %d]", slot->stackPos + slot->sizeBytes); break;
+            }
+
+            break;
         }
 
         default: assert(false);
     }
 }
 
+void emitInst(GravityTargetArch self, GravityInstruction inst) {
+}
+
 void emitRet(GravityTargetArch self, GravityValue value) {
     sbAppend(self->outputBuffer, "mov eax, ");
     emitValue(self, value);
     sbAppend(self->outputBuffer, "\nret");
 }
 
+void emitAlloc(GravityTargetArch self, GravityType type, GravityValue result) {
+    GravityVarSlot* varSlot = malloc(sizeof(GravityVarSlot));
+    varSlot->stackPos = self->stackPos;
+    varSlot->sizeBytes = gravityGetTypeSize(type);
+    varSlot->type = type;
+    self->stackPos += varSlot->sizeBytes;
+
+    HASH_ADD_KEYPTR(hh, self->vars, result, sizeof(void*), varSlot);
+}
+
+void emitStore(GravityTargetArch self, GravityValue pointer, GravityValue value) {
+    sbAppend(self->outputBuffer, "mov ");
+    emitValue(self, pointer);
+    sbAppend(self->outputBuffer, ", ");
+    emitValue(self, value);
+    sbAppend(self->outputBuffer, "\n");
+}
+
+void emitLoad(GravityTargetArch self, GravityValue pointer, GravityValue result) {
+    sbAppend(self->outputBuffer, "mov ");
+    emitValue(self, result);
+    sbAppend(self->outputBuffer, ", ");
+    emitValue(self, pointer);
+    sbAppend(self->outputBuffer, "\n");
+}
+
 GravityValue emitIntConst(GravityTargetArch self, GravityValue constVal) {
     return constVal;
 }
 
 void emitFunction(GravityTargetArch self, GravityFunction function) {
-    sbAppend(self->outputBuffer, "%s:\n", function->name);
+    sbAppend(self->outputBuffer, "%s:\npush rbp\nmov rbp, rsp\n", function->name);
 }
 
 void emitBlock(GravityTargetArch self, GravityBlock block) {
     sbAppend(self->outputBuffer, ".%s:\n", block->name);
 }
 
-GravityTargetArch_x86_64 gravityCreate_x86_64Target(void) {
+GravityTargetArch gravityCreate_x86_64Target(void) {
     GravityTargetArch baseArch = gravityNewTargetArch("x86_64");
 
     baseArch->emitFunction = emitFunction;
     baseArch->emitBlock = emitBlock;
+    baseArch->emitInst = emitInst;
 
     baseArch->emitIntConst = emitIntConst;
     baseArch->emitRet = emitRet;
+    baseArch->emitAlloc = emitAlloc;
+    baseArch->emitStore = emitStore;
+    baseArch->emitLoad = emitLoad;
 
-    GravityTargetArch_x86_64 targetArch = {
+    return baseArch;
-        .baseArch = baseArch,
-
-        .stackPos = 0
-    };
-
-    return targetArch;
 }

src/generators/arch/x86_64.h

@@ -3,12 +3,6 @@
 
 #include "../generator.h"
 
-typedef struct {
+GravityTargetArch gravityCreate_x86_64Target(void);
-    GravityTargetArch baseArch;
-
-    uint32_t stackPos;
-} GravityTargetArch_x86_64;
-
-GravityTargetArch_x86_64 gravityCreate_x86_64Target(void);
 
 #endif

src/generators/generator.c

@@ -13,14 +13,20 @@ GravityTargetArch gravityNewTargetArch(const char* name) {
     initStringBuff(outputBuff);
     targetArch->outputBuffer = outputBuff;
     targetArch->name = strdup(name);
+    targetArch->vars = NULL;
 
     return targetArch;
 }
 
 void gravityTargetEmitInst(GravityTargetArch arch, GravityInstruction inst) {
+    arch->emitInst(arch, inst);
+
     switch (inst.opcode) {
         case GravityOpcodeIntConst: arch->emitIntConst(arch, inst.operands[0]); break;
         case GravityOpcodeRet: arch->emitRet(arch, inst.operands[0]); break;
+        case GravityOpcodeAlloc: arch->emitAlloc(arch, inst.operands[0]->type->typeData, inst.result); break;
+        case GravityOpcodeStore: arch->emitStore(arch, inst.operands[0], inst.operands[1]); break;
+        case GravityOpcodeLoad: arch->emitLoad(arch, inst.operands[0], inst.result); break;
 
         default: assert(false);
     }
@@ -51,3 +57,28 @@ char* gravityTargetEmitModule(GravityTargetArch arch, GravityModule module) {
 
     return arch->outputBuffer->data;
 }
+
+GravityType gravityResolveInstructionResult(GravityTargetArch arch, GravityInstruction inst) {
+    switch (inst.opcode) {
+        case GravityOpcodeAlloc: {
+            GravityType outType = gravityCreateType();
+            outType->typeKind = GravityPointerTypeKind;
+            outType->ptrType = inst.operands[0]->type->typeData;
+            return outType;
+        }
+
+        case GravityOpcodeLoad: {
+
+            GravityVarSlot* var;
+            HASH_FIND(hh, arch->vars, inst.operands[0], sizeof(void*), var);
+
+            if (!var) assert(false);
+
+            return var->type->ptrType;
+        }
+
+        default: assert(false);
+    }
+
+    
+}

src/generators/generator.h

@@ -3,23 +3,40 @@
 
 #include "../ir/module.h"
 #include "../ir/type.h"
+#include <uthash.h>
 
 typedef struct GravityOpaqueTargetArch* GravityTargetArch;
 
+typedef struct {
+    uint32_t stackPos;
+    uint32_t sizeBytes;
+    GravityType type;
+    UT_hash_handle hh;
+} GravityVarSlot;
+
 struct GravityOpaqueTargetArch {
     const char* name;
     StringBuffer* outputBuffer;
 
     GravityFunction currentFunction;
 
+    uint32_t stackPos;
+    GravityVarSlot* vars;
+
     void (*emitFunction)(GravityTargetArch self, GravityFunction function);
     void (*emitBlock)(GravityTargetArch self, GravityBlock block);
     void (*emitValue)(GravityTargetArch self, GravityValue value);
+    void (*emitInst)(GravityTargetArch self, GravityInstruction inst);
 
     GravityValue (*emitIntConst)(GravityTargetArch self, GravityValue constVal);
     void (*emitRet)(GravityTargetArch self, GravityValue returnValue);
+    void (*emitAlloc)(GravityTargetArch self, GravityType type, GravityValue result);
+    void (*emitStore)(GravityTargetArch self, GravityValue pointer, GravityValue value);
+    void (*emitLoad)(GravityTargetArch self, GravityValue pointer, GravityValue result);
 };
 
+GravityType gravityResolveInstructionResult(GravityTargetArch arch, GravityInstruction inst);
+
 GravityTargetArch gravityNewTargetArch(const char* name);
 char* gravityTargetEmitModule(GravityTargetArch arch, GravityModule module);
 

src/ir/type.c

@@ -69,3 +69,14 @@ char* gravityTypeToCStr(GravityType type) {
 
     return buff.data;
 }
+
+int gravityGetTypeSize(GravityType type) {
+    printf("%d\n", type->typeKind);
+    switch (type->typeKind) {
+        case GravityIntTypeKind: return type->integer.width / 8;
+        case GravityPointerTypeKind: return sizeof(void*);
+        case GravityFloatTypeKind: return 4;
+
+        default: assert(false);
+    }
+}

src/ir/type.h

@@ -36,6 +36,7 @@ struct GravityOpaqueType {
         GravityFunctionType function;
         GravityIntType integer;
         GravityType typeData;
+        GravityType ptrType;
     };
 };
 
@@ -48,4 +49,6 @@ GravityType gravityCreatePointerType(void);
 
 char* gravityTypeToCStr(GravityType type);
 
+int gravityGetTypeSize(GravityType type);
+
 #endif

test.c

@@ -51,8 +51,14 @@ int main(void) {
     gravityBuildRet(builder, xValue);*/
 
     gravityBuilderSwitchToBlock(builder, entryBlock);
-    GravityValue returnVal = gravityBuildIntConstant(builder, charType, 123, NULL);
+
-    gravityBuildRet(builder, returnVal);
+    GravityValue variable = gravityBuildAlloc(builder, charType, NULL);
+    GravityValue returnVal = gravityNewIntConstant(charType, 123);//gravityBuildIntConstant(builder, charType, 123, NULL);
+    gravityBuildStore(builder, variable, returnVal);
+    
+    
+    GravityValue varValue = gravityBuildLoad(builder, variable, NULL);
+    gravityBuildRet(builder, varValue);
 
     printf("%s\n", gravityFunctionToCStr(mainFunc));