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Started implementing some opcodes

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This commit is contained in:
Raimon Zamora
2017-01-24 13:36:52 +01:00
parent b49c1e543f
commit 1bd5b0a6da
4 changed files with 68 additions and 3 deletions
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4
main.cpp
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@@ -3,6 +3,8 @@
int main(int argc, char** argv) { int main(int argc, char** argv) {
int i = 10;
int x = i++ + (i++ + 1);
// aci, i == 12 ; x == 21
return 0; return 0;
} }

7
vbvm.vcxproj
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@@ -76,6 +76,13 @@
</Link> </Link>
</ItemDefinitionGroup> </ItemDefinitionGroup>
<ItemGroup> <ItemGroup>
<ClCompile Include="main.cpp" />
<ClCompile Include="stack.cpp" />
<ClCompile Include="vm.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="stack.h" />
<ClInclude Include="vm.h" />
</ItemGroup> </ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" /> <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets"> <ImportGroup Label="ExtensionTargets">

19
vbvm.vcxproj.filters
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@@ -14,4 +14,23 @@
<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions> <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
</Filter> </Filter>
</ItemGroup> </ItemGroup>
<ItemGroup>
<ClCompile Include="main.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="stack.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="vm.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="vm.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="stack.h">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
</Project> </Project>

41
vm.cpp
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@@ -1,5 +1,9 @@
#include "vm.h" #include "vm.h"
#define MAX_EXTERNAL_CALLS 256
#define MAX_DATA_STACK 256
#define MAX_CALL_STACK 256
enum OPS { enum OPS {
OP_NOP = 0, OP_NOP = 0,
OP_PUSH, OP_PUSH,
@@ -34,19 +38,52 @@ enum OPS {
}; };
typedef void(*t_extcall)(t_stack&); typedef void(*t_extcall)(t_stack&);
t_extcall external_calls[100]; t_extcall external_calls[MAX_EXTERNAL_CALLS];
int numcallbacks = 0; int numcallbacks = 0;
const unsigned char* vm_program = nullptr; const unsigned char* vm_program = nullptr;
int vm_pc = 0; int vm_pc = 0;
int vm_cycles = 0;
t_stack vm_datastack;
t_stack vm_callstack;
void vm_init(const unsigned char* program) { void vm_init(const unsigned char* program) {
vm_program = program; vm_program = program;
vm_pc = 0; vm_pc = 0;
vm_datastack = stack_new(MAX_DATA_STACK);
vm_callstack = stack_new(MAX_CALL_STACK);
} }
void vm_step() {
void vm_step() {
switch (vm_program[vm_pc++]) {
case OP_NOP: vm_cycles++; break;
case OP_PUSH: stack_push(vm_datastack, vm_program[vm_pc++]); vm_cycles++; break;
case OP_POP: stack_pop(vm_datastack); vm_cycles++; break;
case OP_DUP: stack_push(vm_datastack, stack_peek(vm_datastack)); vm_cycles++; break;
case OP_LOAD: vm_cycles++; break;
case OP_STORE: vm_cycles++; break;
case OP_JMP: vm_pc = vm_program[vm_pc] + (vm_program[vm_pc + 1] << 8); vm_cycles++; break;
case OP_JNT: vm_cycles++; break;
case OP_JTR: vm_cycles++; break;
case OP_JSR: vm_cycles++; break;
case OP_RET: vm_cycles++; break;
case OP_CALL: external_calls[vm_program[vm_pc++]](vm_datastack); vm_cycles++; break;
case OP_ADD: vm_cycles++; break;
case OP_SUB: vm_cycles++; break;
case OP_MUL: vm_cycles++; break;
case OP_DIV: vm_cycles++; break;
case OP_MOD: vm_cycles++; break;
case OP_AND: vm_cycles++; break;
case OP_OR: vm_cycles++; break;
case OP_NOT: vm_cycles++; break;
case OP_NEG: vm_cycles++; break;
case OP_INC: vm_cycles++; break;
case OP_EQ: vm_cycles++; break;
case OP_NEQ: vm_cycles++; break;
case OP_LT: vm_cycles++; break;
case OP_GT: vm_cycles++; break;
}
} }
void vm_register_call(void(*callback)(t_stack&)) { void vm_register_call(void(*callback)(t_stack&)) {