add setDefaultJmpNEAR
diff --git a/readme.md b/readme.md
index fecf4f3..5f5820d 100644
--- a/readme.md
+++ b/readme.md
@@ -1,5 +1,5 @@
-# Xbyak 5.86 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
+# Xbyak 5.87 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
## Abstract
@@ -216,6 +216,32 @@
}
```
+### short and long jump
+Xbyak deals with jump mnemonics of an undefined label as short jump if no type is specified.
+So if the size between jmp and label is larger than 127 byte, then xbyak will cause an error.
+
+```
+jmp("short-jmp"); // short jmp
+// small code
+L("short-jmp");
+
+jmp("long-jmp");
+// long code
+L("long-jmp"); // throw exception
+```
+Then specify T_NEAR for jmp.
+```
+jmp("long-jmp", T_NEAR); // long jmp
+// long code
+L("long-jmp");
+```
+Or call `setDefaultJmpNEAR(true);` once, then the default type is set to T_NEAR.
+```
+jmp("long-jmp"); // long jmp
+// long code
+L("long-jmp");
+```
+
### Label class
`L()` and `jxx()` support Label class.
@@ -396,6 +422,7 @@
http://opensource.org/licenses/BSD-3-Clause
## History
+* 2019/Dec/19 ver 5.87 add setDefaultJmpNEAR(), which deals with `jmp` of an undefined label as T_NEAR if no type is specified.
* 2019/Dec/13 ver 5.86 [changed] revert to the behavior before v5.84 if -fno-operator-names is defined (and() is available)
* 2019/Dec/07 ver 5.85 append MAP_JIT flag to mmap for macOS mojave or later
* 2019/Nov/29 ver 5.84 [changed] XBYAK_NO_OP_NAMES is defined unless XBYAK_USE_OP_NAMES is defined
diff --git a/readme.txt b/readme.txt
index 2bcc735..f70f441 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,5 +1,5 @@
- C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.86
+ C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.87
-----------------------------------------------------------------------------
◎概要
@@ -371,6 +371,7 @@
-----------------------------------------------------------------------------
◎履歴
+2019/12/19 ver 5.87 未定義ラベルへのjmp命令のデフォルト挙動をT_NEARにするsetDefaultJmpNEAR()を追加
2019/12/13 ver 5.86 [変更] -fno-operator-namesが指定されたときは5.84以前の挙動に戻す
2019/12/07 ver 5.85 mmapにMAP_JITフラグを追加(macOS mojave以上)
2019/11/29 ver 5.84 [変更] XBYAK_USE_OP_NAMESが定義されていない限りXBYAK_NO_OP_NAMESが定義されるように変更
diff --git a/test/jmp.cpp b/test/jmp.cpp
index 4921a5a..3afc773 100644
--- a/test/jmp.cpp
+++ b/test/jmp.cpp
@@ -1305,3 +1305,76 @@
printf("id=%d %d %d %d %d\n", L1.getId(), L2.getId(), L3.getId(), L4.getId(), L5.getId());
}
}
+
+struct JmpTypeCode : Xbyak::CodeGenerator {
+ void nops()
+ {
+ for (int i = 0; i < 130; i++) {
+ nop();
+ }
+ }
+ // return jmp code size
+ size_t gen(bool pre, bool large, Xbyak::CodeGenerator::LabelType type)
+ {
+ Label label;
+ if (pre) {
+ L(label);
+ if (large) nops();
+ size_t pos = getSize();
+ jmp(label, type);
+ return getSize() - pos;
+ } else {
+ size_t pos = getSize();
+ jmp(label, type);
+ size_t size = getSize() - pos;
+ if (large) nops();
+ L(label);
+ return size;
+ }
+ }
+};
+
+CYBOZU_TEST_AUTO(setDefaultJmpNEAR)
+{
+ const Xbyak::CodeGenerator::LabelType T_SHORT = Xbyak::CodeGenerator::T_SHORT;
+ const Xbyak::CodeGenerator::LabelType T_NEAR = Xbyak::CodeGenerator::T_NEAR;
+ const Xbyak::CodeGenerator::LabelType T_AUTO = Xbyak::CodeGenerator::T_AUTO;
+ const struct {
+ bool pre;
+ bool large;
+ Xbyak::CodeGenerator::LabelType type;
+ size_t expect1; // 0 means exception
+ size_t expect2;
+ } tbl[] = {
+ { false, false, T_SHORT, 2, 2 },
+ { false, false, T_NEAR, 5, 5 },
+ { false, true, T_SHORT, 0, 0 },
+ { false, true, T_NEAR, 5, 5 },
+
+ { true, false, T_SHORT, 2, 2 },
+ { true, false, T_NEAR, 5, 5 },
+ { true, true, T_SHORT, 0, 0 },
+ { true, true, T_NEAR, 5, 5 },
+
+ { false, false, T_AUTO, 2, 5 },
+ { false, true, T_AUTO, 0, 5 },
+ { true, false, T_AUTO, 2, 2 },
+ { true, true, T_AUTO, 5, 5 },
+ };
+ JmpTypeCode code1, code2;
+ code2.setDefaultJmpNEAR(true);
+ for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
+ if (tbl[i].expect1) {
+ size_t size = code1.gen(tbl[i].pre, tbl[i].large, tbl[i].type);
+ CYBOZU_TEST_EQUAL(size, tbl[i].expect1);
+ } else {
+ CYBOZU_TEST_EXCEPTION(code1.gen(tbl[i].pre, tbl[i].large, tbl[i].type), std::exception);
+ }
+ if (tbl[i].expect2) {
+ size_t size = code2.gen(tbl[i].pre, tbl[i].large, tbl[i].type);
+ CYBOZU_TEST_EQUAL(size, tbl[i].expect2);
+ } else {
+ CYBOZU_TEST_EXCEPTION(code2.gen(tbl[i].pre, tbl[i].large, tbl[i].type), std::exception);
+ }
+ }
+}
diff --git a/xbyak/xbyak.h b/xbyak/xbyak.h
index 5c29899..a41503c 100644
--- a/xbyak/xbyak.h
+++ b/xbyak/xbyak.h
@@ -115,7 +115,7 @@
enum {
DEFAULT_MAX_CODE_SIZE = 4096,
- VERSION = 0x5860 /* 0xABCD = A.BC(D) */
+ VERSION = 0x5870 /* 0xABCD = A.BC(D) */
};
#ifndef MIE_INTEGER_TYPE_DEFINED
@@ -1775,6 +1775,7 @@
db(longCode); dd(disp - longJmpSize);
}
}
+ bool isNEAR(LabelType type) const { return type == T_NEAR || (type == T_AUTO && isDefaultJmpNEAR_); }
template<class T>
void opJmp(T& label, LabelType type, uint8 shortCode, uint8 longCode, uint8 longPref)
{
@@ -1784,7 +1785,7 @@
makeJmp(inner::VerifyInInt32(offset - size_), type, shortCode, longCode, longPref);
} else {
int jmpSize = 0;
- if (type == T_NEAR) {
+ if (isNEAR(type)) {
jmpSize = 4;
if (longPref) db(longPref);
db(longCode); dd(0);
@@ -1799,7 +1800,7 @@
void opJmpAbs(const void *addr, LabelType type, uint8 shortCode, uint8 longCode, uint8 longPref = 0)
{
if (isAutoGrow()) {
- if (type != T_NEAR) throw Error(ERR_ONLY_T_NEAR_IS_SUPPORTED_IN_AUTO_GROW);
+ if (!isNEAR(type)) throw Error(ERR_ONLY_T_NEAR_IS_SUPPORTED_IN_AUTO_GROW);
if (size_ + 16 >= maxSize_) growMemory();
if (longPref) db(longPref);
db(longCode);
@@ -2293,6 +2294,9 @@
#ifndef XBYAK_DISABLE_SEGMENT
const Segment es, cs, ss, ds, fs, gs;
#endif
+private:
+ bool isDefaultJmpNEAR_;
+public:
void L(const std::string& label) { labelMgr_.defineSlabel(label); }
void L(Label& label) { labelMgr_.defineClabel(label); }
Label L() { Label label; L(label); return label; }
@@ -2312,6 +2316,8 @@
void putL(std::string label) { putL_inner(label); }
void putL(const Label& label) { putL_inner(label); }
+ // set default type of `jmp` of undefined label to T_NEAR
+ void setDefaultJmpNEAR(bool near) { isDefaultJmpNEAR_ = near; }
void jmp(const Operand& op) { opR_ModM(op, BIT, 4, 0xFF, NONE, NONE, true); }
void jmp(std::string label, LabelType type = T_AUTO) { opJmp(label, type, 0xEB, 0xE9, 0); }
void jmp(const char *label, LabelType type = T_AUTO) { jmp(std::string(label), type); }
@@ -2570,6 +2576,7 @@
#ifndef XBYAK_DISABLE_SEGMENT
, es(Segment::es), cs(Segment::cs), ss(Segment::ss), ds(Segment::ds), fs(Segment::fs), gs(Segment::gs)
#endif
+ , isDefaultJmpNEAR_(false)
{
labelMgr_.set(this);
}
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index c398db2..ff1ee07 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -1,4 +1,4 @@
-const char *getVersionString() const { return "5.86"; }
+const char *getVersionString() const { return "5.87"; }
void adc(const Operand& op, uint32 imm) { opRM_I(op, imm, 0x10, 2); }
void adc(const Operand& op1, const Operand& op2) { opRM_RM(op1, op2, 0x10); }
void adcx(const Reg32e& reg, const Operand& op) { opGen(reg, op, 0xF6, 0x66, isREG32_REG32orMEM, NONE, 0x38); }
